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Патент USA US2410694

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Nov. 5, lgdl?.
R. TYLER
2,43%4
I
MULTIPLE TABLE DRIVE
Filed July so, 1942
7 Sheets-Sheet 1
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INVENTOé
"ANSUM TYLER
Nov. 5, 1946.
2,410,694
R. TYLE'R
MULTIPLE , TABLE DRIVE
Filed July 30, 1942
7 Sheets-Sheet 2
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2,41%,694
MULTIPLE TABLE DRIVE
, Filed July 30,-}942
'7 Sheets-Sheet 3
BNVENTOR
RANsm/i ‘TYLER
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NW. 5, 1%.46.
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R‘. TYLER’
MULTIPLE TABLE DRIVE
Filed July 30, 1942
7 Sheets-Sheet 4
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UNVENTOR
HANSBM T YLER
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R’. TYLER
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MULTIPLE TABLE DRIVE
Filed July so, 1942 "
7 sheetsqSheet 5
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INVENT'
HANsuM TYLER
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HULTIPLE TABLE‘ DRIVE
Filied July so, 1942
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INVENTOR
H AN 3 u M T YL ER
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MULTIPLE TABLE DRIVE
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I. ANSDM i YLER
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Patented Nov. 5, ‘#1946
2,410,694
NITED STATES PATENT Fries
2,410,694 I
EIULTIPLE
DRIVE
Ransom Tyler, Green?eld, Wia, assignor to The
Oilgear Company, Milwaukee, Wis., a corpora
tion of Wisconsin
1
Application July 30, 1942, Serial No. 452,924:
20 Claims. (Cl. 113-38)
2
This invention relates to drives of the type
employed for advancing and retracting a plu
~
.
of the press in the order in which the controls
of the several tables are operated.
'
.
rality of tables or slides in selective sequences.
Another object is to provide a drive whic
For the purpose of illustration, the invention
will accelerate and decelerate each‘table at a
rate-slow enough to avoid displacing work ar
will be explained as employed for driving a plu
ranged upon the table.
rality of tables associated with a hydraulic press
Other objects and advantages will appear from
but it is to be understood that a drive constructed
the following description of a multiple table press
according to the invention may be employed for
having a drive embodying the invention and
other purposes.
shown schematically in the accompanying draw
Large hydraulic presses are sometimes provided
ings in which the views are as follows: 7
with a plurality of‘tables or Work slides which
Fig. 1 is a diagrammatic'front view of a mul
are arranged around the outside of the press and
tiple table press provided with a table drive con
are adapted to be moved one at a time into and
structed according to the invention.
out of the press so that operators may load ‘work
upon the tables outside the press during the time 15 Fig. 2 is a sectional plan view taken on the
line 2—-2 of Fig. 1.
.
that the press is operating upon the work on
Fig. 3 is a diagram of the hydraulic circuit and
the table which has been advanced into the press.
shows the solenoids for operating the pilot and
Since the time required to arrange the work
control valves.
'1
.
_
_
in position for pressing is ordinarily considerably
Figs. 4 and 5 are views showing the pilot valve
longer than the time required for the pressing
with its plunger in positions diiierent from that
operation, approximately as much work can be
shown in Fig.3.
'
performed upon a press having, for example, four
Fig. 6 is a diagram showing the magnetic
tables as can be performed upon four single table
switches for controlling the operating solenoids
presses.
in Fig. 3.
In some instances, the tables are moved into 25 shown
Figs. '7 and 8 are diagrams showing relays or
and out of the press in a ?xed sequence but,
contactor switches .for controlling the magnetic
multiple table presses are ordinarily em- '
switches
shown in Fig.6.
ployed for operating upon many different types
'Figs. 9 and 10 are across-the-line diagrams '
of work, the time‘required to load one table may 30 which together show the complete control cir=
be only a small fraction of the time required to
cuit.
load another table in which case the production
For the purpose of illustration, a drive embody
capacity of the press is greatly reduced if the '
ing the‘invention has been shown applied to a
tables are moved in a fixed sequence.
press having four tables or work slides i, 2', 3,
In other instances, each table is loaded by one
and it but the invention may readily be applied
or more operators and, as soon as it is loaded,
to a press having a di?erent number of tables.
the operator signals an operator at a control
As shown, the press includes a lied 5, a head
station who controls the movement of the loaded
frame 5 connected to bed 5 by four strain rods
tables into and out of the press, but this arrange
i, a ram cylinder a carried by head 6 and a ram
ment requires the services of an operator in ad~ 40 a fitted in cylinder a and connected to a platen
dition to the operators who load the tables.
it which is slidable upon and guided by rods l.
The present invention has as an object to pro- _ Tables i, 2, 3 and i when outside the press are
vide a ‘multiple table press with a drive of such
character that the operators who load the tables
may control the movements of the tables into and
out of the press to thereby‘eliminate the ne
cessity of employing an additional operator.
Another object is to provide a drive of this
character in which each operator may operate
a control to initiate movement of his table into
and out of the press but that table will not move
until the table in the press has been fully re
tracted therefrom.
'
another obj act is to provide a drive of this char
acter in which the tables will move into andout
, arranged, respectively, upon supports ii, i2, i3
and it which are arranged around bed 5 and have
their upper surfaces flush with the upper surface
of bed 5 so that they may be advanced one at
a time onto bed 5 and beneath a rubber pad i5
carried by platen id upon the underside thereof.
At least one operator is’ provided for each table,
dies (not shown) are arranged upon the table:
and work is arranged upon the dies. When any
one of the tables with work thereon is advanced
into the press, ram Q will advance platen it‘; and.
cause pad 55 to. operate upon the work on that
table until the‘ pressing operation is completed
'
r 2,410,694
‘4
Pistons 21 and 23 are larger than piston 24 so
that slideblock 23 will be moved toward the
and then ram 9 will automatically retract platen
‘I II to and stop it in its upper position.
_
right when liquid is simultaneously supplied to
ri‘hewpress is provided with a‘ suitable power
plant for operating it and with a suitable control
for causing it to operate semi-automatically as
explained above but, since the press per se forms
no part of the present invention, the power plant
and pressqcontrol have been omitted from the
drawingsland only so much of the press shown
both of cylinders 25 and 29 at the same pressure.
Liquid for operating pistons 24, 21 and 23 is
supplied by a gear pump 35 which is ordinarily
driven ‘in unison with pump 20 and arranged in
the casing thereof according to the usual practice
but which, for the purpose of illustration, has
been shown as being separate therefrom.
as is necessary for an explanation of the invenf
tion.
Gear pump 35 draws liquid from a, reservoir 35
and discharges it into a branched supply channel
.
Tables I, 2, 3 and 4 are operated, respectively,
by‘reciprocating hydraulic motors M1, M2, M3
31 at a rate in excess of requirements, the excess .
liquid being exhausted through a relief valve 38
which enables gear pump 35 to vmaintain in chan
and M4 each consisting of a cylinder l5 (Fig. 3)
and a piston I1 which is ?tted in cylinder 16 and
connected by a rod 18 to the inner end of the
table as shown in dotted lines in Fig. l, the move
m mi; of each table in each'direction being limited
by a positive stop, not shown.
nel 31 a pressure equal to the resistance of relief
valve 33.
,
One branch of supply channel 31 is connected
to the outer end of cylinder 25 so that piston 24
‘
the table motors are energized by liquid sup 20 is constantly urged toward the left by a constant
force which is proportional to gear pump pres
plied thereto from a pump 20 which may be
sure. This branch has an adjustable choke 39
reversible to direct liquid into one and receive
arranged therein to limit the rate of flow to and
liquid from the other of two channels 2| and 22
from cylinder 25 and thereby limit the rate at
or it may 'be of the ‘unidirectional type and a
reversing valve provided to reverse the direction 25 which pistons 24, 21 and 28 can shift slide
block 23.
of flow. For the purpose of illustration, pump
Another branch of supply channel 31 is con
29 has beenshown as being reversible and of
nected to a Pilot valve 40 which controls the ?ow
the rolling piston type. Since this type of pump
of liquid to and from,cylinder 29 and thereby
is fully illustrated and ‘described in Patent No.
2,047,068, it is deemed su?icient to state herein 30 controls the operation of pump 29. Pilot valve
40 has a valve member or plunger 41 ?tted in a
that pump 29 has itslpumping mechanism ar
valve casing 42 to control communication between
‘ ranged within a displacement varying member or
four annular grooves or ports 43,-“, 45 and 46
slide block 23 and that it will deliver liquid in a
formed in valve casing 42. .
v
I
direction and at a rate dependent upon the direc
Port 43 communicates with the branch of sup
tion and the distance slideblock 23 is shifted 35
ply channel 31 that is connected to valve 40.
from its central or neutral position in which posi
Port v44 is connected by a channel 41 to cylinder
tion of slide block 23 the displacement of pump
' 29 is zero and no, liquid will he delivered thereby.
. 29 at Or‘ near the outer end thereof.
Port 45 is
Slide block 23 is at all times urged toward the
connected by a channel 48 to cylinder 29 at, a
left by liquid acting upon a piston 24 connected to 10 point between pistons 21 and 28. Port 46 is con
or in engagement with slide block 23 and ?tted in
nected' to a drain channel 49 which discharges
a stationary cylinder 25 which is carried by the
into reservoir 36.
‘
Valve member 4| is urged to and normally
casing of pump 20 and has an adjusting screw 25
retained in its central or neutral position by two
threaded through its outer end to limit the move- ‘
ment of piston 24 and slide block 23 toward the 45 springs 4|B and 41b which are arranged in suit
right. Turning screw 25 will adjust the rate at!
able spring chambers located at opposite endsof
which pump 20 will discharge liquid into chan
casing 42. Valve member 4| is adapted to be
nel 2 I.
.
shifted in one direction or the other by one or the
'
.Slide block 23 is adapted to be moved toward
other of two solenoids S5 and $6 the armatures
the right by liquidacting upon one or the other 50 of which are connected to opposite ends of valve
7 member 4! by suitable valve stems.
of two pistons 21 and 28 which are ?tted in a
stationary cylinder 29 carried by the pump cas
Due to the displacement of each piston rod 18,
ing. - Piston’ 21 engages slide block 23 and piston
the volume discharged by pump 20 will vary from
the volume discharged from any one of the
28 is} adapted to engage .the outer face of
piston 21.
.
The movement of piston 28 toward the right
is limited by a collar 39 ?xed on a stop rod 3|
65
motors by an amount equal to the displacement
~ of rod 18.
It is therefore necessary to supply
which extends loosely through pistons 21 and-28
liquid from reservoir 33 to pump 20 during move
ment of a piston l1 in one direction and to permit
and through the head of cylinder 29. ‘ The inner
the discharge of liquid into reservoir 36 during
end of rod 31 is adapted to engage slide block 23 60 movement of a piston I1 in the opposite direc
and the outer end of rod 31 is provided with a _ tion. This is accomplished by providing pump
nut 32 which, in the present instance, is adjusted
23 with an automatic valve 52 which is arranged
to so position collar 30 that piston 28 when ener
in a bore 53 having two annular grooves or ports
gized ‘will move slide block 23 to a position just
54 and 55 formed in the wall thereof. Port 54
short of neutral so that pump 20 will at that time 65 and the left end of bore 53 are connected to
deliver liquid into channel 22 at a rate which is
. channel'2l by a channel 2 la, port 55 and the right
very limited, such as two or three percent of
end of bore 53 are connected to channel 22 by a
maximum.
‘
channel 228, and bore 53 is connected at a point
The outer end of rod 31 is adapted to engage
intermediate ports 54 and 55 to reservoir 35
an adjusting screw 33 which is threaded through 70 through a check valve 55 and a low pressure
resistance‘ valve 51. Check valve 56 permits
a cap 34 ?xed to the head of cylinder 29. Turn
pump 20 to drawv liquid freely from reservoir 36
ing screw 33 adjusts the distance rod 3| and
slide block 23 may be moved toward the left’ to v but prevents the discharge of liquid from bore 53
except through resistance valve 51.v
thereby determine the rate at which pump 20
will deliver liquid into channel 22.
The delivery of liquid from'pump 20 to the
2,410,894
head ends of the four table motors Ml, M2, M8
and M6 is controlled, respectively, by four nor
mally closed control valves Vi, V2, V3 and ‘V4
each of which includesa valve member 53 ar-.
ranged in a casing 69 and urged to its closed
position by a spring 6'0.v Valve member 58 con
trols communication between a branch ofv chan
nel 22 and a channel 6| which connects casing
59|to the head end of cylinder i6.
v
ward movement of platen III as shown in Fig. 1.
The actual mechanisms for operating the limit
switches, the mountings therefor and the exact
locations thereof have not been illustrated since
they form no part of the invention and since
the limit switches are necessarily shown on a
much larger scale than the press structure. For
example, the tables have been shown as rela
tively short and as having short strokes while
As will'presently appear, the rod ends of all 10 in practice the table stroke is sometimes more
four motors are supplied with-pressure liquid
than six feet.
1
during the time any one motor is performing a
Solenoid S5 and a control valve solenoid Si,
cycle of'operation. Since the pressure in the
S2, S3 or $5 are energized simultaneously as
end of a non-operating motor might cause liquid
will presently be explained. Energizing a con
to leak past piston ll of that motor and cause 15 trol valve solenoid causes it to open its control
it to creep ahead, each valve member 58 also
valve Vi, V2, V3 and Vt. Energizing solenoid
controls communication between a'channel ti
S5 causes it to shift plunger ti of pilot valve
and a drain channel 69“ which connects the
to to the position shown in Fig. e to connect chan
casings of all four control valves to reservoir 35
nels t1 and. 53 to drain channel d9 so that gear
but which has been omitted from the drawings 20 pump liquid can flow through vchannel 31 to cyl
in order to avoid complicating the view. When
inder 25 and cause piston is to'move slide block
a control valve is open, its valve member 58 blocks
23 slowly toward the left atthe rate determined
communication between channel Bi and- drain
by ‘choke 39.
-.
channel is“ and connects channel iii to chan
_Moving slide block 23 toward the leftwill
nel 22 so that motive liquid may ?ow to‘ and 25 ‘cause pump 20 to discharge liquid into channel
‘ from cylinder [6 to effect operation of piston
22 and this liquid will tend to flow through chan
i1 and, when a control valve is closed, the branch - nel 22a to reservoir 36 but, due to the resistance
of channel 22 connected thereto is blocked by
of valve 51, pressure will rise, extend to the right
valve member 58 and channel 6! is open to drain
end of bore 53 and shift automatic valve 52 to
channel 29“ so that liquid can escape freely 30 the left to uncover port 56 and to block port
from the head end of cylinder i6 and thereby
55 so that pump 20 can draw liquid from reser
enable pressure in the rod end of cylinder‘ I6
voir 36 through check valve 56 but cannot dis
to return piston ii to and hold it ?rmly in its _
charge liquid into reservoir 36.
fully retracted position.
'
The liquid delivered by pump 2d will then
The four control valves are operated, respec
tively, by four solenoids SI, 52, S3 and St each
of which has its armature connected to the stem
of the associated control valve. A check valve
62 connected between each channel 8i and chan
35 flow through channel 22 and the'open control '
valve to the head end of the table motor Mi.
M2, M3 o'rMt associated with the open valve,
thereby causing pump pressure to increase and
shift di?erential valve piston 65 toward the left '
nel 22' permits liquid to. be discharged freely 40 so that pump pressure can extend through chan
from cylinder [6 into channel '22 but prevents
nel at to the rod ends of all four motors. If
the ?ow of liquid from channel 22 into the head
end of cylinder it except through the associated
_
control valve.
'
When a piston ii is advanced by liquid sup
plied to the head end of its cylinder it, the
_ liquid discharged from the rod end of that cyl
inder i6 is directed to the head end thereof
the pistons ll of the other motors have crept
forward‘, the pressure in the rod ends of those
-motcrs will return those pistons to their fully
45 retracted positions for the reason that the head
ends of those motors are open to drain through
the closed control valves.
The liquid delivered by pump 20 to the head
through a di?'erential valve which includes a cas
end of the motor Mi, M2, M3 or M6 will cause
ing 63 and a piston 6i ?tted therein. Casing 50 its piston H to advance the table i, 2, 3 or door‘:
63 has channels 2i and 22 connected ‘to oppo
nectedthereto, and the liquid expelled by piston
site ends thereof and it is connected interme
H from cylinder iG will ?ow through channel
diate its ends by a branched channel 65 to the
65 ‘and diiferential valve casing 63 into channel
rod ends of all four cylinders it.
i
22 so that pump 20 need supply only a volume
As shown in Fig. 2, each of tables I, 2, 3 and Q 55 of liquid proportional to the area of rod it, the
in its inward and outward movements operates
area of the rod ordinarily being nearly one half
four limit switches which have been indicated,
that of the piston so that the table is moved at
respectively, by placing the digits 1, 2, 3 and 4
nearly the same speed in both directions.
after the table reference numerals which are pre
Due to the action of choke‘ 29, slide block 2%
ceded by the letters LS. rIfhat is, table i operates 60 moves slowly toward the left and gradually in
limit switches LSH, LSI2, LSi3 and mill, ta
creases the displacement and volumetric delivery
ble2; operates limit switches 152i, L822, 1523
and LSZt, table 3 operates limit switches L336,
L332, L833 and 153%, and table 1% operates limit,
switches LSM, L532, 15% and LS-?iil.
_
Limit switches LS! i, LSZi, LS3! and LSM are
operated at the outer limits of table movement,
switches LSi2, L822, LS32 and L822 are oper
ated during outward table movement, switches
of pump 28 so that the table motor starts the
table at a very slow speed and gradually. ac
celerates it to full speed.
The table will con
65 tinue to move, inward at full speed until it oper
ates limit switch LSié, L823, L835 or 1.8% which
will cause solenoid S5 to he deenergized as will
presently be explained.
‘
'
Deenergizing solenoid Si‘: permits spring tie to
LSit, LS2%, LSéS and lists are operated during 70 shift plunger it of pilot valve 65 to its neutral
position and then gear pump liquid will ?ow
inward table movement, and switches LSiQ, Is?d,
' L535; and LS?t are operated at the inner limits
of table movement. A limit switch LS5 is oper~
through the channel 5.? to cylinder 2% and cause
piston 28 to move slide block 22 nearly to its
ated at or near the upper limit of platen iii and
neutral position. Due to the action of choice 32$,
slide block 27¢ will move slowly and thereby slow
another limit switch 15% is operated during up
2,410,604
ly decrease the displacement and volumetric ’
delivery of pump 20 so that the speed of the
inward moving table is gradually reduced until
it reaches its inner limit and engages a positive
switches a, b, c, and ii and a magnet e for oper- \
‘ating those switches. - Solenoid S8 is controlled
by a magnetic switch or contactor C6 which in
cludesh eight mechanically connected switches’
a, b, c, d, e, f, g and h and a magnet i for oper
will have been reduced to the verylimited rate
ating those switches.
'
I
J
Magnet 1 of contactor 06 may be energized to
previously mentioned and then pump 20 will dis
effect reversal of a table by closing a manually
charge through the relief valve (not shown)
which is always provided in pumps of this char
operable reversing switch four of which are pro
acter. The pressure created by pump 20 at this 10' vided and associated, respectively, with tables I,‘
2, 3 and 4 but all of these reversing switches
time will hold the advanced table against its
inner stop and the retracted tables against their
are rendered inoperative by any one of limit
outer stops (not shown).
switches 15“, L824, L834 and L844 being closed
by a table reaching its inner position.
Just as or before the advancing table reaches
its inner limit, it operates limit switch ISM, 15,, Magnets f of contactors Cl, C2, C3 and C4 are '
controlled in part by magnetic switches or relays
1.824, 1834 or 1544 to render the press control
RI, R2, R3 and R4 respectively. As shown .in
mechanism eii'ective which will cause ram‘ 9 to
move platen l0 downward until the pressing op
Fig. 7, each of these relays include six mechani
‘ stop (not shown) at which time pump delivery
eration is completed and to then retract platen ,
cally connected switches a, b, c, d, e and jand a
"I. As platen r, Ill approaches its upper limit, 20 magnet g for operating those switches. Magnet
limit switch LS5 is operated to energize sole
noid S3 which will shift plunger 4! of pilot valve
40 to the position shown in Fig. 5 and then gear
pump liquid'will ?ow through channel 48 and
cause piston 21 to shift slide block 23 toward the 25
right from its neutral position which will cause
pump 20 to discharge liquid into channel 2|.
Resistance valve 51 will prevent pump 20 from
discharging into reservoir 36 except at a low
pressure and this pressure will extend through 30
channel 2|‘ tothe left end of bore 53 and shift
valve 52 toward the right to the position shown
to uncover port 55 and to block port 54 so that
pump 20 can draw liquid freely from reservoir‘
36 through channel 22‘ but cannot ‘discharge 35
liquid into reservoir 36 through channel 2!“.
'9 of the relays are initially energized, respec
tively, by means of manually operable starting
switches SSE, SS2, SS3 .and S34. A fifth relay
‘R5 (Fig. 8) also includes six mechanically con
nected switches a, b, c, d, e and f and a magnet
g for operating those switches. The circuit also
includes four groups of interlocking switches or
relays RI i, RZI and MI, RI2, R22‘ and R32, RI3,
R23 and R33 ‘and RM, R24 and R34. Each of
these relays includes two mechanically con
nected switches a and b and a magnet c for oper
ating‘ those switches as shown in Fig. 8.
The magnets and individual switches of the
several contactors and relays have been .indi
cated in Figs. 9 and 10 and will be hereinafter
referredto by reference characters produced by
‘ The liquid discharged by pump» 20 will'then
adding the reference letters of the magnets and
flow through channel 2| to differential valve
switches ‘as exponents to the reference charac
casing 63, shift piston 84 toward the right to the
ters of the contactors and relays. For example,
position shown and then flow through channel 40 the switches and magnets of relay R34 are desig
nated R34", R34b and R34° respectively.
' 65 to the rod end of the table motor and cause
its piston I‘! to retract the table that is in the
As shown in Fig. 6, current for energizing
i press.
The liquid expelled from- the head end
the several solenoids is supplied from power lines
of cylinder l6 by piston I1 is considerably in ex
_ Li and L2 which areconnected to a source of
cess of the liquid required to supply pump 20, 45 power through a line switch 10, and current for
and‘ the excess liquid is discharged through chan
energizing the magnets of the several contactors
nel 22“, port 55, bore 53 and resistance valve
and relays is supplied from power lines L3 and
31 into reservoir 35.
'
~
'
I
Due to the action of choke 39, slide block 23
L4 which are connected to lines LI and L2
through a transformer ‘H. Solenoids SI, 82, S3,
will move slowly and thereby cause the table 50 S4, S5 and S6 have the opposite ends of their
to be started slowly and gradually accelerated
windings connected to lip LI and L2 through
to full speed as previously explained. The table
the switches a and b of contactors Cl, C2, C3,
will continue to move at full‘ speed until it oper
C4, C5 and C6 respectively.
ates limit switch LSI2, L822, L832 or‘LS42 to
Magnet Clr (Figs. 6 and 10) has one end of its
cause solenoid S6 to be deenergized and thereby 55 winding connected to line L4 and the second end
permit spring 4|h to shift plunger 4| of pilot
of its winding connectable through a wire 12,
, valve 40 to its neutral position to connect pipe
the upper pair of contacts of limit switch LSI I and
48 to drain so that gear pump liquid may ?ow
to'cylinder 25' and cause piston 24 to move
a wire 13 to line L3. ‘The second end of the wind
ing is also connectable through a wire ‘[4, switch
slide block 23 toward the left until it is stopped 60 RI“, 9. wire 15, switch Ri I“, a wire 16, switch R211,
by piston 21 engaging piston 28 at which time
a. wire 11, switch R3", 9. wire ‘I8, switch R5b and
slide block 23 is nearly in its neutral position
a wire 19 to line L3.
_
Magnet 02‘ has one end of its ‘winding con
and the delivery of pump 2|)l is reduced to the
very limited rate previously mentioned, choke
nected to line L6 and the second end of its wind
39 limiting the speed ‘of slide block 23 and there 55 ing connectable through a wire 12“, the upper pair
by causing the table to be gradually decelerated
of contacts of limit switch LSZI and a wire 13
as previously explained.
'
to line L3. The second end of the winding is also
As shown in Fig. 6,. solenoids Si, S2, S3 and
connectable through a wire 14“, switch R2“, 2. wire
S4 are controlled, respectively, by magnetic
15*‘, switch Ri'i?, a wire it“, swith R228, a wire
switches or contactors Cl, C2, C3 and C4 each of 70 ‘H8, switch R32“, 9. wire ‘13*, switch R5B and a wire
which includes ?ve mechanically connected
‘i9a to lineL3.
Magnet C3t has one end of its winding connected
switches a, b, c, d, and e and a magnet f for
to line L4 and the second end of its winding
operating those switches. Solenoid S5 is con
connectable through a wire 12“, the upper pair of
trolledv by a magnetic switch or contactor C5
which includes four mechanically connected 75 contacts of limit switch LS3I and wire ‘[3 to line
2,410,694
L3. The second end of the. winding is also con
,nectable through a wire 14“,- switch R3“, a‘wire
15b, switch RI 3“, a wire 18", switch R23“, a wire 1111,
switch R33“, a wire 18'’, switch R59 and a wire
13b to line L3.
f ’ -
. Magnet C4f has one end of its winding connected
a wire In» to line 1.3. The other terminal of
switch R3! is connectable through a wire. 102b,
switch C8’ and a wire I03b to line L3 and through
a wire I04”, switch C3“ and wire I05b to line L3.,
' Magnet R48 has one end of its winding con
nected to line L4 and the other end thereofcon
nected through a wire I00c to one terminal of
switch R4! and to one terminal'of starting switch
to line L4 and the second end of its winding con
nectable through a wire 12°, the upper pair of
contacts of limit switch LS4I and wire 13 to line . SS4 the other terminal of which is connected by
-L3. The second end of the winding is also con-i 10 a 'wire IN“ to line L3. The other terminal of
nectable through a wire 14°, switch R4°, a wire
switch R41 is connectable through a wire .I02°,
switch 00' and a wire “)3G to line L3, and through
15¢, switch RIP, a wire 16'", switch R24", a wire
a wire I04“, switch' C4“ and a wire 105° to line L3.
11°, switch R34“, a wire 18°, switch R5“ and a
wire 19c to line L3.
.
Magnet RIIc (Figs; 8 and 9) has one end of
Magnet C5e has one end of its winding con 15 its winding connected to line L4 and the other end
nected to line L4 and the second end thereof con
thereof connected to one terminal of switch RI Ib
nectable through a wire 80, switch R5e, a wire
and connected through a wire I I0 to one terminal
oi’ switch R2“. The other terminals of switches
8I any one ofswitches CI°, C28, C3e and 04°,
RI Ib ‘and R2" are both connected by a wire III
2. wire 82. switch C8“ and a wire 83 to line L3.
Wire 82 is also connectable through a wire 84, 20 to one terminal vof switch. RI“. '
Magnet R2Ic has one end of its winding con
limit switch LS5, a wire 85 and any ‘one of limit
switches LSI4, 1.824, L534 and L844 to the
operating circuit of the press.
The second end
‘ nected to line L4 and the other end thereof con
nected to one terminal of switch R2 Ib and connec
ted through a wire “2- to one terminal of switch
of the winding of magnet C8° is also connectable
through switch C5“, a wire 88, limit switches 25 R3‘. The other terminals of switches R2Ib and
R3‘ are both connected by a wire II3 to the ter
LSI3, L823, L533 and L543 which are in-series,
minal of switch RI“ to which wire III is con
and a wire 81 to wire 82 and thence through
nected.
'
,
switch C8c and wire 83 to line L3.
.
Magnet Rt‘lc has one end of its winding con
_ Magnet 001 has one end of its winding connected
to line L4 and a second end thereof connectable 30 nected to line L4 and the other end thereof con
nected to-one terminal-of switch Riilh and con
through a wire 88, limit switches LSI4, L824, L834
nected through a wire II4 to one terminal of
and LS44 which are in series, wire 89 and any one
of reversing switches RSI, RS2, RS3 and‘ RS4
switch R4“. The other terminals of switches
to line L3. The second end .of the winding of
R3I" and R4“ are both connected by a wire II5
magnet C8‘ is also connected by a wire 90 to 35 to the terminal of switch RI“ ‘to which wires III
and H3 are connected. The other terminal of
one terminal of switches C8“ and C59. The
switch RI“ is connected by wire I I6 to line L3.
second terminal of switch C311 is connectable
Magnet RI2° has one end of its winding con
through a wire 9|, any one of limit switches LSI2,
L822, 1532 and L842‘ and a wire 92 to line L3, ’ . nected to line L4 and the other end thereof con
and the second terminal of switch 05° isv con 40 nected to one terminal of switch RI2b and con
nected through a wire H0“ to one terminal of
nectable through a wire 33, limit switch'LSB and
a wire 92 to line L3.
switch RI“. Theother terminals of switches
Magnet R51z (Figs. 8 and 10) has one end of its
RI2h and RI‘1 are both connected by awire II I“.
winding connected to line L4 and the other end
to one terminal of switch R2“. Magnet R22=
has one end of its winding connected to line L4
thereof connectable through, a wire 94, switch
and the other end thereof connected to one ter- C4“, a wire 95', switch C3“, a wire 96, switch C2°,
minal of switch R22h and connected through
a wire 91, switch CI“, a wire 98 and limit switches
1SII,LS2I,LS3I andLS4ItolineL3. -The second
afwire “2" to one terminal of switch R3“. The
end of the winding is also connectable through
‘other terminals of switches R22b and R3h are
50 both connected by a wire II3B‘t0 the terminal
switch R51 and a wire 93 to wire 98.
Magnet RIB (Figs. 7 and 9) has one end of its
of switch R2“ to which wire I I I5 is connected.
Magnet R32c has one end of its winding con
winding connected to line L4 and the other end
thereof connected through a wire I00 to one \ nected to line L4 and the other end thereof con
terminal of switch RI! and to one terminal of'
nected to one terminal of switch R32" and con
starting switch SSI the other terminal of which is 55 nected through a wire “4e to one terminal of
connected by a wire IOI to line L3. The other
switch R4”. The other terminals of switches
terminal of switch RI! is connectablethrough a
R32b and R4h are both connected by a wire H5a
wire I02, switch 06d and a wire I03 to‘line L3
to the terminal of switch R2“ to which wires I I I“
and through a wire I04, switch CI“ and a wire
and II3n are connected. The other terminal of
I05 to line L3.
f '
60 switch R2“ is connected by a wire II 5' to line -
Magnet R2‘z has one-end of its winding con
nected to line L4 and the other end thereof con
nected through a wire I00“ to one terminal of
' switch R2I and to one terminal of starting switch
SS2 the other terminal of which is connected
by a wire IOI“ to line L3. The other terminal of
switch R2! is connectable through a, wire I02“,
switch C6e and a wire I03“ to line L3and through
a wire I 00B, switch C2“ and a wire I05a to line
L3.
'
-
Magnet R38 has one end of its winding con
nected to line L0 and the otherend thereof con
nected through a wire [00b to one terminal of
switch R31 and to one terminal of starting switch
1L3
.
Magnet RI 3° has one end of its winding con
nected ‘to line L4 and the other end thereof con
nected to one terminal of switch RI3b and con
nected through a wire H0b to‘ one terminal of
switch RI“.
The other terminals of switches
Ri3b and RIb are both connected by a wire ill”
to one terminal of switch R3“. Magnet R23= has
one end of its winding connected to line L4 and
the other end thereof connected to one terminal
of switch R23b and connected through a'wire
H2b to‘ one terminal of switch R2". The other
terminals of switches R23b and R2b are both con
nected by wire H3b to the terminal of switc
SS3 the other terminal of which is-connected by 75 R3“ to which, wire 5 lib is connected.
'
v
2,41o,ee4
12
- .Magnet R33° has one end of.its winding con
4 respectively to keep magnets RI 2", R22° and R326
nected to line L4 and the other end thereof con
nected to.one terminal of switch R331’ and ‘con
nected through a wire II4b to one terminal of
switch R4°. The other terminals of switches R331,
and R4° are ‘both. connected by a wire =II5“ to
the terminal of switch R3d to which wires 'I IIb
and I I310 are connected. The other terminal of
switch R3‘! is connected‘by a wire IIIih to line
L3.
Magnet RI4c has one end of its winding con
plained above, raising relays'RI2, R22 and R32
establishes,‘ as
shown ' in
Fig.
10,
a circuit
(L4—C2‘-'-'I4@*—R2c — 15“-.'— RI2L-'I6*—R22'i—
net ‘C2’ which will raise contactor C2 (Fig. 6) to
close switches a, b and'e thereof and to open
10 switches c and 11 thereof. Closing switches C2“
and C2b causes solenoid S2 to be energized and
open valve V2 (Fig. 3). Closing switch 02° es
tablishes, as shown in Fig. ,10, a circuit (L4——C5¢—
nected to line L4 and the other end thereof con
nected to one terminal of switch RMb and con
nected through a wire “0° to one terminal of
switch RI°. The other terminals of switches R I41)
and RI° are both connected by a wire III° to
one terminal of switch R4d.
energized should switches RAE-R3b and R4b open.
Relays R2 and R5 having been raised as ex
80fR5e—8I—C2e—82-C5°-83—L3) to energize
magnet C5e which will raise contactor C5 (Fig. 6)
to open switch 0 thereof and to close switches a,
'
b, and (1 thereof.
'
3
Magnet R24” has one end of its winding. con
Opening switch C5c prevents magnet Clil from
nected to-line L4 and the other endthereof con
being energized if and when limit switch LS6
nected to one terminal of switch R24b and con 20 closes during the down stroke of platen I0. (3105
nected through a wire “2° to one terminal of
ing switch 05d establishes a circuit (L4—C5e—
The other terminals of switches
C5'L-86-LSI3 —- L823 —- LS33—LS43~8‘I-82—
R24b and R2° are both connected by a wire I I 3“
to the terminal of switch R4‘1 to which wire I II”
switch R2”.
C6°—83—L3) to keep magnet C5e energized.
Closing switches C5“_and C5b causes solenoid S5
25 (Fig. 6) to be energized and operate pilot valve
is connected.
.
'
-
-
Magnet R34c has one end of its winding con
40 (Fig. 3) to cause slide block 23 of pump 20
nected to line L4 and the other end thereof con
to be shifted toward the left from its neutral po
nected to one terminal of switch R34b and con
sition and liquid from pump 20 to ?ow through
nected through a wire I I4° to one terminal of
channel 22, valve V2 and channel 6 I to the head end
switch R3”. The other terminals of switches 30 of motor M2 and cause it to advance table 2, the
R34h and R3” are both connected by a wire "5°
speed of slide block being limited by choke 39
to the terminal of switch R4d to which wires I I I °
so that the displacement of pump 20 is gradu
and.II3° are connected. The other terminal of
ally increased from zero with the result that table
switch R4‘1 is connected by a wire I IB° to line L3.
2 is started slowly and gradually accelerated to
Operation
35 full speed as previously explained.
“
4 ‘Assuming that the several parts are in the po
sitions shown and that pumps 20 and 35 are run
_ ning, the drive will operate as follows:
Line switch ‘III (Fig. 6) is ?rst closed to con
nect lines LI and L2 directly to the source of
power and to connect lines L3 and L4 to the source
It has been assumed that starting switches
SS4, SSI and SS3 were successively closed shortly
after starting ‘switch SS2 was closed. Closing
switch SS4 establishes, as shown in ‘Fig. 9, a cir
cuit (L4—R4¢—- I llIl°—-SS4‘— I 0 I °—L8) to energize
magnet R48 which will raise relay R4 (Fig. 7) to
k open switches a, b and e thereof and to close
switches c, d and 1‘ thereof.
Opening switches R4a and R46 prevent, respec
of power through transformer ‘II. This estab
lishes, as shown in Fig. 10, a circuit (LL-R58
tively, magnets R3I° and R336 from being ener
gized. Opening switch R4b has no effect as the
84- 04° — i'I5—C3c -- 9B — C2c - 91 - GIL-98
LSI I-LS2I--LS3I—LS4I—-L4) to energize mag
net RS' which will raise relay R5 (Fig. 8) to close
the switches a, b, c, d, e and 1‘ thereof. Closing
switch R5t establishes a circuit (L4—R5B-—R51—
circuit through magnet R320 is maintained.
through switch R32‘). Closing switch R4‘ estab
lishes two circuits (L4--R4B—I0Il°—R41—III2°—
99-98-LSII—LS2I—1S3I-IS4I—L3) to keep
magnet RSI energized when any one of switches
CI", C2°, C30 or 04° open.
'
Let it now be assumed that table 2 has been
loaded, that starting switch SS2 has been closed
when switch SS4 opens.
Closing switch R4d establishes, as shown in
Fig. 9, two circuits (L4—RI4"--l I0°--RIe-I I I @
and that tables 4, I and 3 were loaded and start 55 R4d—II8¢—L3) and (L4—R34¢— II4°—R3°—
I I5e-R4d--II6°~—L3) to energize magnets RI4¢
ing switches SS4, SSI and SS3 were successively
closed after switch SS2 was closed.
and R346 which will operate relays RI4 and R34
As shown in Fig. 9, closing switch SS2 estab
to close the switches a and 17 thereof. Closing
switches RIIlh and R34b connects magnets RI4c
lishes a circuit (L4—R28—I00a-—SS2—I0IML3)
to energize magnet R28 which will operate relay 60 and R34° to wires II I° and I I 5“, respectively, to
keep those magnets energized. Closing switch
R2 (Fig. ‘7) to close switches c, d and 1‘ thereof
and to open switches a, b and e thereof. Closing
R4‘? will not cause magnet R240 to be energized
switch R21 establishes a circuit’ (L4—R2K—I0Ile—
for the reason that switch R28 is open and, con
R2‘—I02“—C6°—I031—L3) and a circuit (L4
sequently, relay R24 will not be raised and con
R28—I00“-R21-—-I04L-C2d—I05e-L3) to keep
magnet R2g energized.
‘
65 tactor magnet C4’ will not be energized as the
circuit therethrough is broken at switch R24a as
shown in Fig. 10. Since magnet C4f cannot be
(L4--RI2°-I I0“ — RIB - I I Ie-RZLi Ilia-L3) ,
energized and operate contactor C4, solenoid S4
will not be energized and table 4 cannot be ad
70 vanced.
L3) to energize magnets RI2°, R22° and R32‘?
Closing starting switch SSI will establish, as
which will operate relays RI2, R22 and R32 to
shown in Fig. 9, a circuit (L4--RI8--I0Il-SSI—
close the switches a and b thereof. Closing
IOI—L3) to energize magnet RIg which will raise
Closing switch R21 establishes three circuits
switches RI2”, R22b and R32b connects magnets
relay RI (Fig. 7) to open switches a, b and e
~ RI2°, R22° and 1232a to wires me. H3B and H5“ 75 thereof and to close switches a, d and f thereof.
2,410,89é
-
'
14
Opening’ switches Rl‘ and RP has no effect as
84, limit switch LS5, wire 85, limit switch L824,
the circuits through magnets Rl2° and R“‘3 are
maintained by switches Ri2b and RNb respec
the starting solenoid (not shown) of thepress
operating circuit to line L4, thereby causing platen
ill to descend, perform a pressing operation upon
tively. Opening switch RIh prevents magnet
Rl3° from being energized.
Closing switch RIr establishes two circuits
(Li-RiQ-iilO-R?-IOZ- C8d— Hit-L3) and
,(Lt--Ri8—l(lil-Rlt — I04 —- Cid 4 "35 —L3) to
the work on table 2 and then return to and stop
in its initial position.
~
As platen i0 starts downward, limit switch LS5
opens and cuts the starting solenoid out of the
keep magnet Rig energized. Closing switch RId
table control circuit so that it may be controlled
establishes, as shown in Fig. 9, a circuit (Ld— 10 by the press operating circuit. Limit switch LS6
R2l°—ll2—-R3s--'li3-Rid~—li6-L3) to ener
gize magnet R2l° which will raise relay RN to
close the switches a and b thereof. Closing
switch R2 Ih keeps magnet R2 ic energized by con
necting it to wire H8.
However, closing switch RId will not cause
magnets Rl l° and R3l_° to be energized as the
is not operated electrically during the down stroke
. of platen I ll but it is closed momentarily during
the up stroke thereof.
Closing limit switch LS6 establishes a circuit
(L4—C6L-90—C5“-93—LS6-92-L3) to ener
gize magnet. C6l which will raise contactor C6 to
open switches c, d, e, ,f and g thereof and to
circuits therethrough are broken at switches R2“
close switches a, b and h thereof.
Opening switch 06° has no effect as the circuit ‘
will not be raised and contactor magnet Cit will 20 therethrough was broken when limit switches
and R5“ and, consequently, relays RH and R31 ’
not be energized as. the circuit therethrough is
broken at switches RI IEL and R3“. Since mag
net Ci‘ cannot be'energized and operate con
tactor Cl, solenoid SI will not-be energized and
table i cannot be advanced.
Closing starting switch SS3 will establish, as
shown in Fig. 9, a'circuit (L@-'—R3B-—-l0ilb-—SS3—
l0 lb—L3) to energize magnet RSE which will raise
relay R3 to open switches a, b and e thereof and '
to close switches c, d and f thereof.
LS23 and LSM opened. Opening switches C6“,
C61 and C6K‘has no effect as the circuits through
magnets RIB, R38 and R48 are maintained by
switches Cid, C3d and CM respectively. Opening
' switch 06° breaks the circuit through magnet
R2iz which permits relay R2 to drop and close ‘
switches a, b and e thereof and to open switches
c, d and f thereof.
4
.
Opening switches R20 and R2t has no e?ect as
Opening 30 the circuits therethrough were previously broken.
circuits through magnets R2“, R22c and R3$°
are maintained by switches R2 lb, ,R22b and R?tb
Opening switch R2d breaks the circuits through
magnets Rl2°, R22° and R32° to deenergize them
and permit relays Ri2, R22 and R32 to drop which
respectively.
has no effect as the circuit ~controlled thereby
switches R38, R31’ and R3° has no effect as the
.
-
Closing switch R3I establishes two circuits 35 was broken when relay R5 dropped.
Closing switches R2a and R2b establishes two
(R3¥—iiliib- R3*— lil2b—C61— “WM-L3) and
circuits (Lt — Ri l°—l lil-R2**—i i i—R-iLi i8
magnet R38 energized. Closing switch R3‘1 will
have no effect for the reason that switches Rib,
L3) and (Le --R23;¢- l'l2b-R2b-i ISL-i lab
IRZ‘L-LS) to energize magnets RH’0 and R23°
R21’ and R€l° are open and, consequently, solenoid 40 which will raise relays RH and R23 and establish '
holding circuits through these magnets but raising
S3 cannot be energized to cause table 3 to ad
relays RH and R23 has no effect at this time as
vance.
It is therefore obvious that, after one starting '
relays RSI, RH? and R33 have not been raised.
Closing switch R2‘3 establishes a circuit (Lt
switch has been closed to initiate a circuit to
effect an advance movement of the table con 45 R24°—i I 2°—R2e—l'l3°-RtL-i IB°—L3) to ener
gize magnet RMc which will raise relay R25 and
trolled by that switch, advance movement of any
establish a holding circuit through magnet R2t°
of the other tables is prevented.
,
but raising relay R26 will have no effect until relay
As table 2 starts to advance, limit switch LS2!
operates to break the circuit through magnet R58
R5 is raised.
It has previously been stated that raising con- _
and to connect wire 72“ to wire 13 to establish a
new circuit through magnet CZR Breaking the
tactor C6 closed switches a, b and h thereof. Clos
circuit through magnet R5g causes relay R5 to
ing switch C6“ establishes a circuit (Le-CEL
drop and break the previously established cir
cuit through magnet C2! but limit switch LS2i
has overlapping contacts and establishes the new
circuit before the previous circuit is broken so
.061 energized when limit‘ switch LS6 opens as it
that'magnet C21 remains energized. Dropping
relay R? also breaks one of, thecircuits through
magnet C5° but the magnet is kept energized by
gized and operate pilot valve 60 (FIG. 3) to cause
slide block 23 of pump 20 to be shifted toward the
right from its near neutral position and liquid
thel holding circuit extending through switchv
is 'closed only momentarily. Closing switches
C68 and C6b causes solenoid S6 (Fig. '6) to be ener
' from pump 20 to ?ow through channel 2 I , di?er
speed until it openslimit switch L823 to break
the circuit through magnet ‘Cbe which will cause
ential valve 63 and channel 65 to the rod end of
motor M2 and cause it to retract table 2, the
speed of slide blockv 23 being limited by choke 39
so that the displacement of pump 20 is gradually
increased withthe result that table 2 is started
slowly and gradually accelerated to full speed as
contactor C5 to drop and deenergize solenoid S5
previously explained.
so that plunger ti of pilot valve 40 is returned
to its neutral position to cause the displacement
of pump. 20 to be gradually reduced and cause
table 2 to be gradually decelerated as previously
As table 2 moves outward, it will permit limit
switch L826 to return to its initial position, then
it will operate limit switch L823 to its initial
position and it will continue to move outward at
high speed until it opens limit switch L522 to
break the-circuit through magnet Cii1 which'will
Ct .
As table 2 moves forward, it will close limit.
switch LS22, which will have no effect at this
time, and table 2 will continue forward at high ’
explained.
'
As table 2 reaches its forward limit, it operates
limit switch L826 to establish a circuit (Fig. 10)
from line Lt through wire as. switch on. wire
1
permit contactor C6 to drop and deenergize sole
noid se to permit plunger M of pilot‘ valve it to
2,410,694
15
a
be returned to its neutral position to cause the
displacement of pump 28 to be gradually reduced
and thereby cause table 2 to be gradually decel
erated as previously explained.
16
Clf_—‘I'4-Rl¢-15-RIle-'l6-R2Ie—‘l‘|-R3IB—
18—R5b-79—L3) to energize magnet CII which
will raise contactor Cl to energize solenoid Si and
'
to deenergize magnet R58, thereby causing table I
When table 2 reaches its outer limit; it operates
limit switch LSZI to its initial position, thereby
breaking the circuit through magnet C21 whichv
will permit contactor C2 to drop and open its
' switches a, b and e and close its switches c and d. .
to be advanced and retracted in the same manner
that tables 2 and 4 were advanced and retracted
and causing relay R5 to drop.
4 -
When contactor C6 is raised in response to op
eration of switch LSS during upward movement
Opening switch C2e has no effect but opening 10 of platen I I3, it causes relays Rl, Rl I, R2l and R3!
switches C2a and C21) deenergizes solenoid S2
to drop for the same reason that relays R2, RI2,
*which permits control valve V2 toclose. Closing ' R22 and R32 dropped during operation of table 2.
switch C2d has no effect but the closing of switch‘
Dropping relay RI establishes, as shown in Fig.
C20 and the return of switch LS2! to its initial
9, a circuit (L4—RI3°-I lIlb—RIb--l I Ib--R3dposition re-establishes, as shown in Fig. 10, the
I “ii-L3) to energize magnet RI3c which will
circuit (L4 — R5E~—94-C4°~—9i5-—C3°—96—C2°
raise relay RI3 and establish a holding circuit
37—C|°—98—LSII--LS2I—LS3I—I.S4I—L3) to
through that magnet but raising relay RI 3 will
energize magnet R58 which raises relay R5.
have no eiiect until relay R5 is raised.
‘If none of the‘other starting switches had been
When table I reaches its outer limit, it operates
' closed, the drive would now come to rest and 20 switch LSI I to cause contactor C! to drop and
remain idle until a starting switch was closed but
establish, as shown in Fig. 10, a circuit (L4—R5B—
it has been assumed that starting switches SS4,
94 — C4c — 95 - C3c — 96 — C2°—91—Cl°—98-—
SSI’ and SS3 were closed in succession after
LSI I—LS2l—LS3I—LS4l—-L3) to energize mag
switch SS2 was closed, and the closing of switches
net R58 which will raise relay R5 and establish
SS4, SSI and SS3 caused certain circuits to be 25 through switch R5f a holding circuit in magnet
set up as explained above.
R5“.
Therefore, since relays R4, RI4, R24 and R34
Since starting switch SS3 was closed after
have been raised due to the establishing of circuits
switch SSI was closed and since relays R3, RI3,
as a result of closing switch SS4, raising relay
R23 and R33 have been raised as explained above,
R5 will establish, as shown in Fig. 10, a circuit 30 raising relay R5 will establish, as shown in Fig.
(L4 — C4’ — ‘I4c — R4c —15°—RI 4E-‘I6°--R24B~—
10, a circuit (L4--C3f-l4b--R3°—15b—RI3a-—
1'|°—R34“—'I8°-¢-R5d—19¢—L3) to energize mag
‘llib‘—R23'*—llb—--R33*1—'!8b -- R5c — 19b —- L3) to
net 041 which will raise contactor C4 to energize
energize magnet C3‘which will raise contactor C3
solenoid S4 and to deenergize magnet R58, thereby
to energize solenoid S3 and to deenergize magnet
causing table 4 to be advanced and retracted in 35 R58, thereby causing table 3 to be advanced and
the same manner that table 2 was advanced and
retracted and causing relay R5 to drop.
’
retracted in the same manner that tables 2, 4
and I were advanced‘ and retracted and causing
relay R5 to drop.
The electric circuits for controlling the four
tables function in the same manner and are sub
When contactor C6 is raised in response to op
stantially identical, contactors C5 and C6 and re 40 eration of switch LS6 during upward movement
lay R5 being common to all four circuits.
of platen l0, it causes relays R3, RI3, R23 and
When contactor C6 is raised in response to
R33 to drop for the same reason that relays R2,
operation of limit switch LS5 ‘during upward
Rl2, R22 and R32 dropped during operation of
table 2.
movement of platen III as explained above, it
causes relays R4, RI‘4, R24 and R34 to drop for
When table 3 reaches its outer limit, it operates -
the same reason that ‘relays R2, RI2, R22 and
limit switch LS3! to re-establish the circuit
R32 dropped during operation of table 2.
Dropping relay R4 establishes, as shown in Fig.
9, two circuits (L4—R3I°-I I4—R4*—I I 5—RI'¢—
through magnet R56 which will raise relay R5 and
establish through switch R5‘ a holding circuit
‘for magnet R53.
50
R3LI Nib-L3) to energize magnets R3I° and
R33“ which will raise relays R3 Ii and R33 and es
tablish holding circuits through these magnets
but raising relays R3I and~R33 has no e?ect at
‘
If none of the starting switches were closed
after switch SS3 was closed, the drive will now
come to rest and will remain idle until any one
of the starting switches is closed but, if one of
the starting switches has been closed, raising
this time as relay R5 has not been raised.
55 relay R5 will cause the table controlled by that
When table 4 reaches its outer limit, it operates
starting switch to perform a cycle of operation
limit switch LS4I to cause contactor C4 to drop
as explained above.
and establish, as shown in Fig. 10, a circuit (L4
If it is desired to retract a table after'it has
R5E—94—C4¢—95—C3¢—95—C2<=-9l-CIL“
ISI I--LS2 I~LS3 I—LS4I—L3) to energize mag
net R58 which will raise relay R5 and establish
through switch R5t a holding circuit for magnet
R58.
'
If none of the starting switches had been closed
after switch SS4 was closed, the drive would now
come to rest and would remain idle until a start
‘ing switch was closed but it has been assumed
that switches SSI and SS3 were closed in succes
sion after switch SS4 vwas closed, and the closing
of switches SSI and SS3 caused certain circuits
to be set up as explained above.
Therefore, since relays RI I, 122i and R3!‘ have
started to advance, it is simply necessary to close
the reversing switch RSI, RS2, RS3 or RS4 asso
ciated with that table to establish a circuit from ‘
line L3 through the reversing switch, wire 89,
limit switches LS44, LS34, LS24 and LSI4, wire
88 and magnet C61 to line L4 to energize magnet
G6‘ which will raise contactor C6 to effect re-.
versal of pump 20 and consequently retraction of
.the table but, if the reversing switch is closed
after the table is fully advanced and has opened
limit switch L814, LS24, LS34 or LS44, the. table
will not be retracted for the reason that the cir—
cuit through magnet C6‘ is broken by the open
limit switch.
'
-
been raised due to the establishing of circuits as
From the foregoing, it will be obvious that the
the result of closing switch SSI , raising relay R5
tables will be operated in the order in which the
will establish, as shown in Fig. 10, a circuit (L4
75 starting switches are closed, that any table may
2,410,694
17
be operated a plurality of times before- another
table is‘ operated and that the number of tables
or other elements may .be varied by simply vary
ing the number of circuits.
. ‘
The drive shown and described herein is sus
ceptible of various modi?cations and adaptations
without departing from the scope of the invention
is
fully advanced for e?ecting operation of said.
v.valve means to reverse the ?ow in said circuit
and thereby cause the motor connected to that
table to retract the same, means for causing
the speed of the retracting table to be gradually
increased from zero to maximum, means respon
sive to a table being retracted to a given point
for causing said table to be gradually decelerated,
which is hereby claimed as follows:
and means responsive to any table being fully
1. In a machine having a plurality of tables, the
combination of a hydraulic motor connected to 10 retracted for e?ecting operation of said valve
means to cause an advance movement of the table
each table to advance and retract the same, a
connected to the motor-the starting means of _
pump, ?uid channels connecting said motors to
which was next operated in said sequence.
said pump and forming therewith a hydraulic
4. In a machine having a plurality of tables,
circuit, valve means for controlling the ?ow in
said circuit and the operation of each of said 15 the combination of a hydraulic motor connected
motors, a starting means associated with each " to each table to advance and retract the same,
a pump, ?uid channels connecting said motors
motor and operable to e?ect operation of said
to said pump and forming therewith a hydraulic
valve means to cause the motor associated with
circuit, valve means for controlling the ?ow in
that starting means to advance the table con
nected thereto, the several starting means being 20 said circuit and the operation of each of said
motors, a starting means associated with each
operable in any desired sequence, means respon
motor and operable to e?ect operation'of said
sive to any table being fully advanced for e?‘ect
valve means to cause the motor associated with
ing operation of said valve means to reverse the
that starting. means to advance the table con
?ow in said circuit andthereby cause the motor
connected to that table to retract the same, and 25 nected thereto, the several starting means being
operable in any desired sequence, means respon
means responsive to any table being fully re
sive to any one table starting to advance for pre
tracted for e?ecting operation of said valve means
venting any other table from advancing until
. to cause an advance movement of the table con
after said one table has been fully retracted,
nected to the motor the starting means of which
30 means responsive to any table being .fully ad
was next operated in said sequence.
.
'vanced for effecting operation of said valve means
2. In a machine having a plurality of tables.
to reverse the ?ow in said circuit and thereby
the combination of a hydraulic motor connected
cause _the motor connected to that table to re
to each table to advance and retract the same,
tract the same, and means responsive to any table
a. pump, ?uid channels connecting said motors
to said pump and forming therewith a' hydraulic 35 being fully retracted for-effecting operation of
said valve means to cause an advance movement
circuit, valve means for controlling the flow in
said circuit and the operation of each of said
motors, a starting means associated with each
of the ‘table connected to the motor the start
ing means of which was next operated in said
motor and operable to e?ect operation of said
5. In a machine having a plurality of tables,
valve means to cause the motor associated with 40
the combination of a hydraulic motor connected
that starting means to advance the table con
to each table to advance and retract the same,
nected thereto, the several starting means being
a pump, ?uid channels connecting said'motors
operable in any desired sequence, means for caus
ing the speed of the advancing table-to be grad
to said pump and forming therewith a hydraulic
ually increased from zero to maximum, means 45 circuit, Valve means for controlling the ?ow in
responsive to‘ a table being advanced to a given
said circuit and the operation of each of_ said
point for causing said table to be gradually de
motors, a starting means associated with each
sequence.
celerated, means responsive to any table being
-
-
4
motor and operable to ‘e?ect operation of said
' fully advanced for effecting operation of said
.valve means to cause the motor associated with
valve means to reverse the ?ow in said "circuit 60 that starting means to advance the table con- -
and thereby cause the motor connected to that‘
table to retract the same, and means responsive -
to any table being fully retracted-for e?ecting
nected thereto, the several starting means being
operable in any desired sequence, means respon
sive to any one table starting to advance for
operation of said valve means, to cause an ad
preventing any other table from. advancing until
vance movement of the table connected to the 55' afterv said one table has been fully retracted,
motor the starting-means of which was next op
Jmeansfor causing the speed of the advancing
erated in said sequence.
,
.
.
'
.
table to be gradually increased from zero to
3. In a machine having a plurality of tables, - maximum, means responsive to a table being
the combination of a hydraulic motor connected - advanced to a given point for causing said table
to each table to advance and retract the same, 80 to be gradually decelerated, means responsive to
a pump, ?uid channels connecting said motors.
any table being fully advanced for effecting oper
to said pump and forming therewith a hydraulic
ation of said valve means to reverse the ?_ow in
circuit, valve means for controlling the ?ow in
said‘ circuit and thereby cause the motor con
said circuit and the operation of each of said
nected to that table to retract the same, means
motors, a starting means associated with ‘each 86 for causing the speed of the retracting table to
motor and operable to eifect operation of said
be gradually increased from zero to maximum,
valve means to cause the motor associated with
means responsive to a table being retracted to
that starting means to advance the table con
a given point for causing said table to be gradu
nected thereto, the several starting means being
ally decelerated, and means responsive to any
operable in any desired sequence, means for caus
table being fully retracted for effecting oper
ing the speed of the advancing table to be grad
ation of said valve means to cause an advance
ually increased from zero to maximum, means
movement of the table connected to the motor
responsive to a table being‘advanced to a given
the starting means of which was next operated in
point for causing said table to be gradually de
said sequence. _
.
celerated, means responsive to' any table being 75
6. In a machine having 'a plurality oftables,
2,410,694
19
:20
' the combination of a hydraulic motor connected
reverse the flow in said circuit and thereby cause
the motor connected to that table to retract the
same, and means responsive to any table being
to each table to advance and retract the same,
a pump, ?uid channels connecting said motors
to said pump and forming therewith a hydraulic
circuit, ?ow control means for controlling the
?ow in said circuit, valve'means for controlling
each of said motors, and a control for control
ling said control means and including a start
ing means for each motor operation of which
fully retracted for e?ecting operation of said
flow control means and the valve means for con
trolling the motor the starting means of which
was next operated in said sequence to thereby
cause that motor to advance the table connected
thereto.
- effects operation of said ?ow control means and 10
the valve means for controlling‘ the same motor
to cause said motor to advance the table con
>
r
9. In a machine having a plurality of tables,
the combination of a hydraulic motor connected
to each table to advance and retract the same, a,
nected thereto, the several starting means being
pump, ?uid channels connecting said motors to
operable in any desired sequence, means respon
said pump and forming therewith a hydraulic
sive to any table being fully advanced for effect 15 circuit, flow control means for controlling the
ing operation of said ?ow control means to re
flow in'said circuit, valve means for controlling
verse the ?ow in said circuit and thereby cause
each of said motors, and a control for controlling
the motor connected to that table to retract the ~ said control means and including a starting means '
same, and means responsive to any table being
for each motor operation of which effects opera
fully retracted for e?ecting operation ‘of said 20 tion ‘of said flow control means and the valve
flow‘ control means and the valve means for
means for controlling the same motor to cause
controlling the motor the starting means of which
said motor to advance the table connected there
was next operated in said sequence to thereby
to, the several starting means being operable in
any desired sequence, means responsive to any
cause that motor to advance, the table connected
thereto.
'
r
'
l
'7. In‘ a machine having a plurality of tables,
the combination of a hydraulic motor connected
25
one table starting to advance for preventing any ,
other table from advancing until after said one
table has ‘been fully retracted, means for caus
ing the speed of the advancing table to be grad-,
to each table to‘ advance and retract the same.
a pump, ?uid channels connecting said motors
ually increased from zero to maximum, means re
to said pump and forming therewith a hydraulic 30 sponsive to a table being advanced to a given
circuit, ?ow control means for controlling the flow
point for causing said table to be gradually de
in said circuit, valve means for controlling each
celerated, means responsive to any table being
fully advanced for effecting operation of said
of said motors, and a, control for controlling
said control means and including a starting
?ow control means to reverse the ?ow in said
means for each motor operation of which ‘effects 35 circuit and thereby cause the motor connected
operationvof said ?ow control means and the
to that table to retract the same, means for caus
valve means, for controlling the same motor
ing the speed of the retracting table to be grad
to cause said motor to advance the table con
ually increased from zero to maximum, means
nected thereto, the several starting means being
responsive to a table being retracted to a given
operable in any desired sequence, means respon 40 point for causing said table to be gradually de
sive to any one table starting to advance for pre
celerated and means responsive to any table being
venting any other table from advancing until
after said one table has been fully retracted,
fully retracted for effecting operation of said
flow control means and the valve means for con
means responsive to any table being fully ad
vanced for effecting operation of said ?ow con
trolling the motor the starting means of which
45 was next operated in said sequence to thereby
trol means to reverse the ?ow in said circuit and
cause'that motor to advance the table connected
thereby cause the moi or connected to that table
thereto.
to retract the same, and means responsive to
10. In a press having a platen, power means
any table being fully retracted for e?ecting oper
for reciprocating said platen, a control adapted
ation of said flow control means and the valve 50 when actuated to cause said power means to ad
' means for controlling the motor the starting
vance and retract said plates, and a plurality of
means of which was next operated in said se
tables each of which is adapted to be advanced
quence to thereby cause that motor to advance
into and retracted from the path of said platen,
the table connectedthereto.
the combination of a hydraulic motor connected
8. In a machine having a pluralityof tables,
to each table to advance and retract the same, a
the'c'ombination of a hydraulic motor connected
pump, fluid channels connecting said motors to
to each table to advance and retract the same,
said pump and forming therewith a hydraulic cir
a pump, ?uid channels connecting said motors
cuit, valve means for‘ controlling the ‘flow in said
to said pump and forming therewith a hydraulic
circuit and the operation of each of said motors,
circuit, ?ow control means for controlling the 60 a starting means associated with each motor and
?ow in said circuit, valve means for controlling
operable to e?ect operation of said valve means
each of said motors, and a control for controlling
to cause the motor associated with that starting
‘said control means and including a starting means
means to advance the table connected thereto,
the several starting means being operable in
for each motor operation of which e?ects operation of said flow control means and the valve 65 any desired sequence, means responsive to any
means for controlling the same: motor to cause ’
one table being fully advanced for actuating said
press control to thereby cause said platen to be
said motor to advance the table connected there
to, the several starting means being operable in
advanced and retracted, means responsive to said
any desired sequence, means for causing the speed
platen being retracted for e?’ecting operation of
of the advancing table to be gradually increased 70 said valve means to reverse the ?ow in'said circuit
from zero to maximum, means responsive to a
and thereby cause the motor connected to said
table being advanced to a given point for caus
one table to retract the same, and means respon
sive to any table being fully retracted for effecting
ing said table to be gradually decelerated, means
responsive to any table being fully advanced for
operation of said-valve means to cause an advance
e?ecting operation of said ?ow control means to 75 movement of the table connected to the motor
2,410,694
.' the starting means or which was next operated
ing operation of said valve meansto cause an
in said sequence.
11. In a press having a platen, power means
advance movement of the table connected to the
for reciprocating said platen, a control adapted
erated in said sequence.
when actuated to cause said power means to ad
vancev and retract said platen, and a- plurality
' of tables each of which is adapted to be advanced
motor the starting means of which was next op
'
13, In a press having a platen, power means
for reciprocating said platen, a control adapted
when actuated to cause said power means to ad
vance and retract said platen, and a plurality
of tables each of which is adapted to be advanced
to each table to advance and retract the same, 10 into and retracted from the path of said platen,
the combination of a hydraulic motor connected
a pump, ?uid channels connecting said motors
to each table to advance and retract the same,
to said pump and forming therewith a hydraulic
a reversible variable delivery pump, ?uid chan
circuit, valve means for controlling the flow in
into and retracted from the path of said platen,
the combination of a hydraulic motor connected
nels connecting said motors to said pump and
15 forming therewith _a hydraulic circuit, a pump
control for causing said pump to deliver liquid
tor and operable to effect operation of said valve
into either side of said circuit and for varying
means to cause the motor associated with that,
pump delivery between zero and a maximum,]
starting means to advance the table connected
valve means for controlling each of said motors,
thereto, the several starting means being oper
able in any desired sequence, means’ responsive 20 a starting means for each motor operation of
which e?ects operation of said pump control and
to any one table starting to advance for pre
the valve means for controlling the same, motor
venting any other table from advancing until
to cause said pump to deliver liquid to that mo
after said one table has been fully retracted,
tor and enable it to advance the table connected
means responsive to any one table being fully
advanced for actuating said press control to 25 thereto, the several starting means being oper-'
able in any desired sequence, means responsive
thereby cause said platen to be advanced ‘and re- _
‘to any one table being advanced for e?ecting op
tracted, means responsive to said platen being
eration of said pump control to. cause pump de
retracted for e?ecting operation of said valve
livery to be reduced approximately to zero, means
means to reverse the ?ow in said circuit and
responsive to any one table being fully advanced
thereby cause the motor ‘connected to said one
v for actuating said press control to thereby cause
table to retract the same, and means responsive
said platen to be advanced and retracted, means
to any table being fully retracted for effecting.
responsive to said platen being retracted‘ for ef
operation of said valve means to cause an ad
fecting operation of said pump control to reverse
vance movement of the table connected to the
motor the starting means of which was next op 35 the flow in said circuit and thereby cause the mo
tor connected to said one table't'o retract the
erated in said sequence.
.
same, and means responsive to any table-being
12. In a press having a platen, power means
- said circuit and the operation of each of said mo
tors, a starting means associated with each mo
for reciprocating said platen, a control adapted
fully retracted for effecting operation of said
pump control and said valve means to cause an
' vance and retract said platen, and a plurality 40 advance movement of the table connected to the '
when actuated to cause said power means to ad
of tables each of which is adapted to be advanced
motor the starting means of which was ‘next op-_
into and retracted from the path of, said platen,
erated in said sequence. ,
the combination of a hydraulic motor connected
to each table to advance and retract the same,
a pump, fluid channels connecting said motors
to said pump and forming therewith a hydraulic
_ 14. In a press having a platen, power means for
reciprocating said platen, a control adapted when
actuated to cause said. power means to advance
and retract said platen, and a plurality of tables
each of which is adapted to be advanced into and
retracted from the path of said platen, the com
bination of a hydraulic motor connected to each
circuit, valve means for‘ controlling the ?ow in
said circuit and the operation of each of said
motors, a starting means associated with each
motor and operable to effect operation of said 50 table to advance and retract the same, a re
versible variable delivery pump, ?uid channels
valve means to cause the motor associated with
connecting said motors to said pump and forming
that starting means to advance the table con
therewith a hydraulic circuit, a pump control for
nected thereto, the several starting means being
causing said pump to deliver liquid into either
operable in any desired sequence, means respon
side of said circuit and for varying pump delivery
sive to any one ‘table starting to advance for
between zero and a maximum, valve means for
preventing any other table from advancing until.
controlling each of said motors, a starting means
after said one table has been‘ fully retracted,
for each motor operation of which e?ects opera
means for causing the speed of the advancing"
tion of said pump control and the valve means
table to be gradually increased from zero to max
imum, means responsive to a table being ‘ad- 60 for controlling the same motor to cause said pump
to deliver liquid to that motor and enable it to
vanced to a given point for causing said table
"advance the table connected thereto, the several
to be gradually decelerated, means responsive to
starting means being operable in any desired se
any one table being fully advanced for actuat
quence, means responsive to any one table start
ing said press control to thereby cause said plat
en to be advanced and retracted, means respon
‘ ing to advance for preventing an.v other table
sive to said platen being retracted for e?ecting
operation of said valve means to reverse the ?ow
from advancing until after said one table has
been fully retracted, means responsive to any
in said circuit and thereby cause the motor con
nected to said one table to retract the same,
one table being advanced for eifecting operation
of said pump control to cause pump delivery to
means for causing the speed of the retracting 70 be reduced‘ approximately to zero, means respon
sive to any one table being fully advanced for ac
table to be gradually increased from zero to max
tuating said press control to thereby cause said
imum, means responsive to a table being re
platen to be advanced and retracted, means re
tracted to a given point for causing said table
s'ponsive to said platen being retracted for ef
to be gradually decelerated, and means respon
sive, to any table being fully retracted for e?c'ect 75 fecting operation of said pump control to‘ reverse
2,410,694
23
24
the flow in said circuit and thereby cause the
said limit switches for energizing a- sub-circuit
to e?ect operation of any one of the other motors
whose starting switch was operated next after
the motor operating said one limit switch had
started to operate.
17. In a system having a plurality of individ
ually movable elements, the‘ combination of a_
plurality of motors each of which is connected
motor connected to said one table to retract the
same, and means responsive‘ to any table ,being
, full-y retracted for effecting operation of ‘said
pump control and said valve means to cause an
advance movement'of the table connected to the
motor the starting means of which was next op
erated in said sequence.
,
15. In a system having a, plurality of "ele
to one of said elements and adapted when ener
ments, the combination of a plurality of motors 10 gized to operate the same, means for energizing
éach of‘ which‘is connected to one'of said ele
‘said motors, control means for said motors in-.
ments and adapted when energized to drive it.
cluding a separate controller for each motor, a
inoppositfe directions, a power source for ener
starting means associated with each motor and
sizing said motors, means for controlling the de
operable to effect operation of said control‘ means
livery of energy to said motors including a sepa
- to cause the associated motor to operate the ele
rate controller for each motor, and an electric
ment. connected thereto, the- several starting
circuit having instrumentalities for operating said
means being operable in any desired sequence,v
control means and including a starting switch for
means responsive to one element starting to op
each element and adapted when operated to
crate for preventing any other element from be
initiate a circuit to e?‘ect operation of said con 20 ing operated, and means responsive to an ele
ment completing its operation for eiiecting op
eration of another of said motors the starting
trol means to cause movement in one direction of
the element with which that switch is associated,
a plurality of switch means' each of which is op
erable by. one of said elements at a given point
in the movement thereof in said direction and
means of which was next operated in said se
quence.
'
,
'
_'
'
18. In a system having a plurality of individ
ually movable elements,‘ the combination of‘ a
plurality‘of motors each of which is connected to
one of said elements and adapted when energized
to operate the same,~means for energizing said
adapted when operated to initiate a circuit for
operating said control means to e?ect movement
of that element in the opposite direction, a plu
rality of limit switches each of which is operable
by one of said elements ‘at’ the end of its move 30 motors, control means for said motors including
ment in said opposite direction, means respon
a separate controller for each motor, a starting
sive to the initial movement of any one element
_means associated with 'eachymotor and operable
for preventing the subsequent operation of any
to e?'ect operation of said control means to cause
other starting switch from causing movement 'of
the associated motor to operate the element con
any other element until after said one element
nected thereto, the several starting means being
has reachedthe end of its movement in said op
‘operable in any desired sequence, means respond
posite direction, and means responsive to opera
sive to one element starting to operate for pre
tion of any one of said limit switches for estab
venting any other element from being operated,
lishing a circuit to effect operation‘of any one
means-for gradually accelerating and decelerating
of the other elements whose starting switch was
each of said motors, and means responsive to an
operated next after the element operating said
element completing its ‘operation for effecting
operation of another of said motors the start
one limit switch had started to move.
'
16. A hydraulic drive, comprising a plurality
ing means of which was next operated in said
of hydraulic motors, a source of motive liquid,
?uid channels connecting said motors to said
1 19. In a system having a plurality of individ
source in parallel with each other and forming
ually vmovable elements, the combination of a
therewith a hydraulic circuit, flow control means
plurality of hydraulic motors ‘each of which is
_for directing liquid from said source into either
connected to one of said elements and adapted
or neither side of said circuit, valve means for
when energized to operate the same, means for _
controlling each ‘of said‘ motors, and an electric 50 supplying motive liquid to said motors to ener
sequence.
circuit having instrumentalities for operating said
'
'
size the same, control means for said motors in
means and including a plurality of sub-circuits, a
cluding a separate control valve for each motor,
plurality of starting switches each of which is
and an electric circuit including magnetic means
associated with one of said motors and adapted
for operating said control means, a starting
“when operated to initiate energlzation of a sub 55 switch associated with each motor and operable
circuit to eifect operation of said flow control
to e?’ect operation of said control means-to cause
means and the valve means for controlling the
the associated motor to operate the element con
motor with which the operated starting switch
nected thereto, the several starting switches being
operable in any desired sequence, means respon
crate in one direction, a plurality of switch means 60 slv'e to one element starting to operate for pre
I - is associated to thereby cause that motorto op
each of which is operable by one of said motors
duringoperation thereof in said direction and
which when operated is adapted to initiate ener
venting any other element from being operated,
" and means responsive .to an element completing
its operation for effecting operation of another of
said motors the starting switch of which was next
' gization of a. sub-circuit to effect operation of
saidnow control means to thereby‘cause that 65
motor to operate in the opposite direction, a plu- .
operated in said sequence.
rality of limit switches each of which is operable
vidually movable elements, a plurality of motors
.
_
20'. In a machine having a plurality of indi
by one of said motors at the completion or its
operation in said opposite direction, means re
each of whichis connected to one of said elements
and adapted when energized to move it through
' sponsive to initiating operation of any one mo 70 a given cycle, and means for energizing said mo
tor for preventing the subsequent operation of any
to'rathe combination of means for controlling ,
other starting switch from causing operation of
any. other motor until after said one motor has
the delivery of energy to said motors including a
separate controller for each motor, and inter
locking electric circuits having devices for op
erating said control means and including a start
completed its operation in said opposite direction,
— and means responsive to operation or any, one of
1
475
aemeee
ing switch associated with each element and‘
adapted when operated to establish a circuit to '
e?’ect operation of said control means to initiate
movement of the element with which that switch
is associated, a plurality of . limit switches each of
which is operable by one of said elements at the
end of its cycle of movement, means responsive
to the initial movement of any one element for
preventing .the subsequent operation of a start
ing switch from causing movement of any other 10
element until after said one element 11 ‘reached
the end of its cycle of movement, and means re
sponsive to operation of any one of said limit
switches for establishing a circuit to effect move
ment of any other element whose starting switch
was operated_ next after the switch associated
with the element operating said one limit switch
was operated.
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