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Nam, 5, 394%.
E. CANNON
294N973?
CONTROL FOR HYDRAULIC PRESSES
Filed June 30, 1943
~ ‘ 3 Sheets-Sheet l
INVENTOR
- F/i/PA
BY
‘
C/m/A/aAA
'
New 59 3%’2
E. CANNGN
2,43,?32
CONTROL FOR HYDRAULIC PRESSES
Filed June so, 1943
I
rk
.
89a
3 Sheets-Sheet 2
av. 5, 1946.
E, CANNON ‘
ZAiQjiZ
CONTROL FOR HYDRAULIC PRESSES
’
Filed June so, 1943
r- 150'
s Sheets-Sheet 3
I53
INVENTOR
-8Mc¢ Cay/vaul
. Fly-5
*
Patented ov. 5, 1946
’ 2,410,?12
STATES - PATEN
oFFic
2,410,712
CONTROL FOR ‘HYDRAULIC raassas
Earl Cannon, Rockville Centre, N. Y., assignor to
E. W. Bliss Company, Brooklyn, N. Y., a cor
porati'on of Delaware
1
Application June 30, 1943, Serial No. 492,863
23 Claims. (Cl. 12141)
This invention relates .to operating controls‘
for hydraulic presses of the character which en
able a press operator to cause the reciprocating
platen or slide of a hydraulic press to pursue
a partial stroke in either of opposite directions
. and to control, very easily, the amplitude of such
a partial stroke with a high degree of precision.
fords substantially a side elevational view of‘ such
apparatus;
‘
'
Fig. 2 is an enlarged side elevational view,
partly broken away, of certain important mech
anisms illustrated in Fig. 1;
Fig. 3 is a horizontal sectional view substan
‘aliy on the irregular lines 3—3 of Figs. 1 and
Press operation adapted to yield such a partial
2;
'
stroke is referred to hereinafter as “inching”
Fig. 4 is a vertical sectional view substantially
operation. More particularly, the invention re 10 on the lines 4-4 of Figs. 1, 2, and 3; v
lates to electrical inching controls for hydraulic
Fig. 5 is a diagram of a hydraulic press sys
presses having the mentioned attribute of pre
tem according to the present invention, includ
cision control and which, also are adapted for
ing electric controls for both normal and inching
easy conversion from control of inching opera
operation of a press; and
_
'
tion of the press to control of normal press oper
Fig. 6- is a vertical sectional view, of substan
ation which may be fully or partly automatic.
tially the same character as Fig. 4, illustrating
The obiects of the intention and important
principles employed therein
An important object of the present inventionis 2.0
the provision of improved means for controlling
portions of a second embodiment of the inven
tion.
General description of press and. inching control
apparatus‘
Referring ?rst to Fig. 1, the hydraulic press
the inching of the press slide to facilitate, for ex
may comprise a base ll, tied in spaced relation- '
ample, the setting of dies in the press.
ship, by side pieces [I 2, to a crown l3 within which .
Another important object of the invention is 25 may reciprocate a ram It on the lower end of
the provision of inching control means which,
which is fixed a horizontal slide l5 which may be
while depending upon the movement or position
guided by jibs It. The side pieces l2,‘ themselves,
of the press slide for limiting theinching thereof,
may serve directly as the connection between the
nevertheless, have no parts which are so directly
base and crown of the press, or, if desired, the
connected to the, slide as to require any bodily 30 said side pieces may serve as spacing members
' displacement thereof in order to convert the press
within which may be disposed suitable tie rods
from inching to normal operation, or vice versa.
I‘! which, as shown diagrammatically in Fig. 5,
The foregoing objects and others which may be
perceived from the following speci?cation and"
the accompanying drawings are achieved, ac 35
cording to the present invention, by providing
means for controlling normal operation of the
may be secured to both the base and crown of
the press in a well understood manner. Also, if
desired, the side pieces l2 may be omitted and the
tie rods adapted to serveboth as spacing mem
bers ‘and tie rods or tension members.
press and an electrical inching control system
The mechanism which responds directly to
which may, if desired, comprise portions of the '
control by the operator comprises a broadened
mentioned normal control system, and in which 40 traveling nut l8, threaded upon a vertical screw
circuits, controlling the inching movement of the
I9, unthreaded portions at or near the ends of
press slide, may be established or broken by the which are retained within suitable thrust bear
movement of the slide relatively to certain por
ings in brackets 20 and 2|, fixed upon the side
tions of apparatus comprising the inching control
of the press, preferably at the crown and base
system. Among expedients available for the pur 45 thereof, respectively. The screw l9 may be ro
pose, photoelectric cells may be employed advan
taegously in circuits of suchinching control sys
tems and the-light rays controlling the operation
of said cells may either be intercepted or passed
by a, member arranged to operate as a shutter in
response to movement of the press slide.
In the accompanying drawings:
Figure 1 is a perspective view of a hydraulic _
tated conveniently, by the press operator, by
means of a hand wheel 22 which is suitably keyed
to one end of and turns a shaft 23, to the other
end of which is keyed a bevel gear 24 which
meshes with and drives a bevel gear 25 with
which the screw I9 is constrained to turn. The
traveling nut I8 is constrained against rotating
with the screw I9, by a vertical guide rod 26,
press, including inching control apparatus,‘
which is suitably ?xed at its opposite ends within
a which, although in perspective, nevertheless af-' 55 or upon the brackets 20, 2| and extends, with a
2,410,712
sliding fit, through a suitable vertical bore in the
nut l8; hence, rotation of the handwheel 22, by
the operator, causes the nut l8 to travel up or
down upon. the screw l9, depending upon the di
rection in which the handwheel is turned.
4
chambers 55, 56 are connected by a pipe line 51
to the tank 52.
'
The distribution of liquid through the valve 49
is controlled by the movement of a piston 49a
comprising a shank 58 and piston heads 59, 8|]. ~
On the adjacent end of the slide l5 or upon an
extension 21 ?xed or formed thereon, there may
and GI, preferably formed integrally upon said
shank in suitable spaced relationship. Lateral
be ?xedly mounted a pair of toggle switches 28,
passages 62, ‘63, 64, extend diametrically com
29 and a pair of photoelectric cell assemblies 30,
pletely through said piston heads and are connect
35, all adapted to coact, in a manner hereinafter 10 ed by a longitudinal passage 65 within the shank
explained, with certain members ?xed upon the
traveling nut l8.
The piston 490. may be shifted to upper or
lower extreme positions by oppositely acting elec
The two mentioned cell assemblies may be
carried, in superposed relationship, upon a
tric solenoids 66, 61 which are coupled by a link
bracket 40 which is ?xed to the extension 2'! of 15 68, and both connected by a link 69 to one end
the press slide. A vertical opaque shutter mem
of a lever 10, fulcrumed, at an intermediate point
ber 38 is ?xed upon one side of the traveling nut
thereof, upon a bracket 1| which may be mounted
i8‘, adjacent the cell assemblies, and extends
upon the casing of the valve 49. The other end
between photo-electric cells 3|, 36 of the two cell
of the lever ‘I0 is connected, by a link 12, to the
assemblies, and light sources in said assemblies 20 protruding upper end of the piston 49a. When
in the form of incandescent lamps 32, 31', The
neither of said solenoids is energized, the piston
said shutter, preferably, is of such vertical di
may be held yieldably in a center or neutral po
mension as to be barely capable of instantane
sition by a suitable centering spring device 13 en
ously blocking off the passage of light from both
closed within the lower end of the casing of the
said lamps to their related cells and to permit
valve 49.
'
passage of light to one or the other of said
When the piston 49a is in its lowermost posi
cells upon being moved upwardly or downwardly
tion, the several piston heads 59, 60, 6| guide
relatively to the latter. The several mentioned
liquid from the pump 50, into the ram advance
cells and lamps, preferably, are mounted within
chamber 43 to yield a down or advance stroke
box-like housings 33, which are ?xed upon the 80 of the press slide I5 the liquid from return cham
bracket 40 and are provided with opposed aper
ber 44, meanwhile, exhausting through the valve
tures 34 which, except when closed off by the
49 into the tank 52-_ When the piston is in its
shutter 38, are adapted to pass light rays be
uppermost position, the several piston heads guide
tween the related lamps and cells,
liquid from the pump, into the return chamber to
The toggle switches 28, 29, have V-shaped 85 yield an up or return stroke of the slide, the liq- .
58.
,
-
'
pivotally movable operating members 28a, 29a,
uid from the advance chamber, meanwhile, ex
hausting through the valve 49 into the tank.
When the piston is in its center or neutral posi
extending inwardly from the traveling nut |B
tion as shown in Fig. 5, ‘the liquid from the pump
that, when said nut is moved downwardly on 40 passes into lateral passage 63, and thence,
screw [9 by turning of the wheel 22, the pin
through longitudinal passage 65, and lateral pas
4| may engage the'lower arm of the operating
sages 82, 84 into the pipe line 51 which carries
member 29a and-impart a snap movement there
it to the tank, hence, when the piston 49a is in
to to shift it from its solid line position, (Fig.
itscenter position the slide I5 is notvhydrauli
2) in which the switch 29 is closed, to its broken 45 cally actuated in either direction.
line position, in which said switch is open. A
The press system as a whole
subsequent reverse movement of said nut causes
respectively, which are so disposed in the line of
movement of an actuating pin 4| ?xed to and
~ the pin 4| to engage the upper arm of the mem
The press system may be understood, practi
cally in its entirety, by reference to Fig. 5, which
ber 29:: to close the switch 29. Likewise when
the nut I8 is moved upwardly on the screw I9, 60 includes not ,only the apparatus already described
the pin 4| may actuate the member 28a to open
in detail but also an electric system for control
the‘switch 28 and a subsequent reverse or down
ling the press.
For the sake of simplicity, in Fig. 5, certain
ward movement causes the pin 4| to close the
switch 28. As hereinafter explained, operation
~ electric switch contactor controlling relays, in
of the apparatus may be such that the pin 4| ‘55 stead of being shown in their assembled rela
tionship with their contactors in proper juxtapo
will remain between and out of engagement with
the operating members m‘ and 29a, thereby
sition with reference to the coils operating them,
leaving both switches 28 and 29 in their normally,
are shown with the coils in their clearly de?ned
closed positions.
Hydraulic system for operating the press
- circuits and the contactors in circuits, also clear
60 1y defined, which they control. The said relay
coils are diagrammatically indicated as coils hav
ing a movable core indicated by double lines and
An enlarged portion or head Ila, formed on
the contactors are indicated by parallel lines lo
the upper end of the ram |4, works withina
cated in the circuits which they control. Nor
cylinder 42 and, with the latter, de?nes a ram 65 mally‘ closed contactors (i. e., closed when the
advance chamber 49 and a return chamber 44,
related coil is deenergized) further, are identi?ed
which are connected, respectively, by pipe lines
by a diagonal line crossing said parallel lines, and
45, 45, to annular chambers 41, 48, in a distribut
normally openwcontactors are identi?ed by‘the
ing valve' 4-9. A pump 50, which may be suitably
absence of such a diagonal line. The reference
driven ‘continuously, as by an electric motor (not 70 character applied to each'of such contactors in
shown), draws liquid through a pipe line 4| from
eludes the number used as the reference char
acter of the relay coil controlling its operation;
a tank 52, which may conveniently be constructed. ,
upon the top of, the press, and discharges such
and the reference characters of different con»
liquid, through a pipe line 52, into an annular
tactors operated by any one relay coil include dis
chamber I4 in the valve 49., A pair'of annular 75 'tinguishing su?lxes, a, b, c, etc.
2,4;0312
Limit switches ‘M, ‘l5, ‘l8, functioning in elec
tric circuits as hereinafter explained, may be
?xed upon non-moving parts of the press in ‘suit
able juxtaposition to the line of movement of
dogs ll, l8, 19, which, respectively, are adapted
to operate said switches. Switches ‘is and 118 are
normally closed (i. e., closed except when engaged
and operated by its related dog) and switch 15 is
'
This ?rst circuit energizes coil m0, thereby clos
ing contactor 80th to bridge ‘switch t8 and thus
maintain said circuitaiter, said switch is re
l?eased and opened; and also‘ ‘closing contactor
00a.
‘
l
‘
»
a
The momentary pressing and closing oi’swltch
88 also establishes a second circuit, from lead 9!
to lead 93, including switches 92 and 81, wire 96,
normally open. Dog ll may be in the form of a
switch 38, wire ill, relay coil lid, wire H2 and
side portion of an elongated sleeve 80 and the 10 then closed contactors ‘i200 and MM. This sec;
dog 19 may comprise a short sleeve, said sleeves
ond circuit energizes coil Ht, thereby closing
being slidalble upon a vertical reciprocating rod
8i and adapted to be held in any desired position
contactor ii?a to establish, with the closed con
tactor llllla, a bridge circuit around switch 88 and
upon said rod by set screws 82, 83, ‘respectively,
thus maintain said ‘second circuit after switch 88
or by other suitable holding means.
'
15 is released. The energizing of coil 6 l0 also opens
' The dog 18 may be pivotally mounted upon the
contactor Hod, thereby vassuring that relay coil
sleeve 80 to pivot between the operative position i
shown in full lines, in which it may operate the
switch 15, and an‘ inoperative position shown in
broken lines in which its path of verticalmove .201
I20, which, as hereinafter explained, serves as a
primary control of the return strckeof the press.
may not become energized while coil H0 is ener
and, hence, may not operate the latter. Suitable
The energizing of coil l in also-closes contactors
M012 and illlc, completing a circuit from lead 9!
locking means are provided, of course, to hold the
to lead 93 through solenoid 66, thereby energizing
ment is clear of the operating arm of said switch
gized‘to effect the advance stroke of the press. ’
dog ‘it in either of the two mentioned positions.
‘the latter and causing the latter’s ‘core to move
The rod 8! works within guide collars 8t, 85 ?xed .25 upwardly and actuate the lever 10 to move the
- to non-movable side portions of the press and is
valve piston 49a to its lowermost position. 'When
constrained to reciprocate with the press slide i5.
the piston is in the latter position the valve 69
by being ?xed to one side of the latter .or an
directs the liquid output of the pump 50 into the
extension thereof as, for example, by a lateral
advance chamber 453 to move the press slide l5
extension rod 86.
30 downwardly while liquid exhausted from the re
‘A pressure actuated electric switch 89 is con-. _ turn chamber it passes through said valve to the
nected to 'the pipe line $5. The contacts of this
‘tank 52.
.
,
switch are normally closed to complete an elec
In the particular control system shown in Fig.
tric circuit according to the diagram except when
5, the extent of the down or advance stroke of the
the pressure inrthe ram advance chamber it 35 slide it may be limited either by pressure built up
rises above a predetermined pressure, at which
in advance chamber M, as by engagement of a
the said switch'may be adjusted to respond and
blank between two diesghaving pressing portions
_ open said circuit.
working in a common vertical line, or by reason
of the said slide having reached a predetermined
40 position in its advance stroke in circumstances
Let it be assumed that the press is idle, has
wherein, for example, the forming of the blank
been properly ?tted with dies, and that it is de
‘is accomplished by dies which partially telescope
sired to cause automatic operation of the press
without materially raising the pressure in said
‘Automatic operation of the press system
wherein the slide l5 will automatically reciprocate
advance chamber at the lower end of the press
to close and open the press repeatedly until 45 stroke. The mentioned‘ pressure limitation of the
stopped by the operator.
The operator ?rst
makes certain that the pivotal dog 18 is in the
operative position thereof, indicated in full lines
in Fig. 5 and that the run-jog switch 81 is set at
“run’? position. It may be assumed, also, that all. 50
advance stroke is controlledv by the normally
closed pressure switch 89 which is hydraulically
connected in the pipe line ‘i5 to render it respon
sive to the pressure in chamber 63 and the men
tioned slide position limitation of the advance
stroke is controlled by the normally closed limit
switch ‘it which may be opened by the dog 19
which, of course, is locked ln'such position on the
rod 8| as to yield operation of the switch 16 at
position,‘ there is no circuit through wire‘ 98 or 55 the desired point in the advance stroke of the
through toggle switches 28, 29, lamps 32, 31, or
press slide. It should be remembered that the
cells Si, 36 connected to said wire, and, hence,
switches 89 and 1B are in series in the electric cir
parts of the pressgancl the hydraulic system are
at rest in the positions shown in said ?gure.
Two things should be observed; ?rst, that, 'be
cause of the setting of the switch ?ll to “run"
in automatic operation of the press, said enumer
cuit through relay coil i3d.
.
, ated elements are inactive regardless of the po
When the press slide reaches the point in its
sition of the nut it relatively to the press slide 60 advance stroke at which the forming operation
it; and, second, when the press slide is at rest
hasbeen completed, one or the other of switches
at the top of its stroke and during its down-stroke,
89, ‘it, depending, ordinarily upon the predeter
relay coil I30, is in energized condition, being in
mination of the omrator, will be opened by the
a circuit extending from main lead 9i through
accumulation of pressure in chamber 63 su?icient
normally closed stop switch 92, relay coil I30, 65 to operate switch 89 or by engagement of the dog
wire I31, normally closed limit switch '56, wire ' ‘i9 with the operating arm of switch ‘i6. The
we, normally closed pressure switch 89, wire I33,
opening of either of these switches breaks the cir
and normally closed contactor I202? to main
cuit through relay coil ltd, deenergizing the latter
lead 93.
'
and, in consequence, opening contactor IBM and
To start the automatic ‘operation of the press, 70 closing‘ contactor I361). The opening of contactor
from its open position, button switch 83 is mo
itiia breaks the described circuit through coil
mentarily pressed and closed to establish a ?rst
H0, thereby deenergizing the latter and, in con
circuit, from lead 9| to lead 93,~including stop
sequence, opening contactor lilla, closing'con
switch 92, run-Jog switch 81, wire 94, down switch
tactor H041, and also opening contactors Hob,
88, wires llll, I02, relay coil I00, and wire I03. 75 ll llc'to deenergize solenoid 66.
n
,
2,410,712
The mentioned closing of contactor Il?b com
pletes a circuit ‘from lead 8| to lead 98, including
switches 02 and 01, wire 94, contactor I00a (closed
because of the fact that coil I00 is maintained
in energized condition at all times during auto~
arctic operation), wire'IZI, contactor vIiiiib, wire ,
I22, relay coil I20, wire I23, then closed limit
through coil I20, thus preventing restarting of
s the press except as'controlled by the operator in
some suitable manner, as, for example, in the
manner hereinbeiore described. Although it may
seldom be desired to start the described auto
matic operation of the press from a condition-in
which its slide is at rest‘ at the bottom of its
switch ‘I4, wire I24, and then closed contactor
“011. This circuit energizes coil I20, whereupon
stroke, nevertheless, such operation may be
started by momentarily pressing and closing but
contactor 120a closes, to bridge contactor “0b,
ton switch 91 which closes a, circuit through coil
I20 to start the return stroke of the press in
"the same manner as the described closing of
and contactors I20b-and I20c open. thus assuring
> that coils I20 and III will remain deenergized
during the return stroke of the press. The ener- '
switch 08 operated to close a circuit through coil
I I0 to start automatic operation of the press from
gizing of coil I20 also closes contactors I20d and
'I20e thereby establishing a circuit from lead 9| 15 its open position. Automatic operation may be
started from an intermediate slide position by
to lead 90 through solenoid 61 and energizing
closing either switch 88 to start operation with
the‘iatter.
.
a downward slide movement or switch 91 to start
- The mentioned deenergizing of solenoid 0B and
operation with an upward slide movement.
the energizing of solenoid 61 so soon thereafter
as to constitute almost simultaneous operation 20 Ordinarily‘ it is desirable to start automatic
operation of the press from itsopen position as
of the two, causes the valve piston 49a to move
hereinbefore described in detail and if the press
from its lowermost to its uppermost position to
slide is’ in any other'than its uppermost position
direct liquid‘, from the pump 50 into the return
it may readily be moved to its uppermost posi
chamber 44 to move the press slide upwardly
while liquid from the advance chamber 43 passes 25 tion by the inching control system the operation ‘
of which is described hereinafter in detail.
through the valve 40 to the tank 52.
As the slide I5 starts to move upwardly the
Semi-automatic operation of ‘the press system
condition of pressing pressure in chamber 43 or
If it is desired to have the press under semi
of position of the slide I5, which operated‘ one
or the other of switches 16, 80 to terminate the so automatic control, wherein the slide may be
caused to advance and automatically returnv to
advance stroke, no‘longer obtains and hence both
open position and then come to rest, it is only
said switches resume their closed setting in series
necessary
for the operator. to set and lock the
in the circuit through coil I30 but that circuit is
not completed ‘during the return stroke of the ’ dog ‘I0 in the position indicated in broken lines,
in Fig. 5, on the sleeve 80. As thus set, the dog
slide due to the fact that contactor I20b is held
‘I0 will not operate the switch ‘I5 on the return
open by coil I20 which is in energized condition
to effect the return stroke of the slide.
-
As the slide I5 approaches the end of its return
- stroke, the dog ‘I0 engages the operating arm of
' stroke of the slide I5 and consequently the de
scribed repeating circuit through coil "0 will not '
be established to againbring the solenoid 00
limit switch ‘I5 and closes the latter thus estab 40 into operation to move the slide downwardly. .
Thus, with the dog ‘I8 set in the last indicated
‘ lishing ‘a connection through wires 95, 80, and
III between the wire I2I and one side of the coil
‘manner, the startingv of ‘each operating cycle I
(i. e., the starting of advance movement of the
press slide) may be accomplished only by the
1 the end of its return stroke, moves dog ‘I1 into 45 closing of button switch 88 by the operator.
It may readily be perceived that, in either auto
engagement with the operating arm. of limit
matic or semi-automatic operation of the press
switch ‘I4 to open the latter and thereby open
the circuit through coil I20 and deenergizing the - system, as hereinbefore described, the strokes of
the slide. I5 are relatively rapid and uninter
latter. ~
50
rupted in contrast to inching operation, as here
The deenergizing of coil I20 opens contactors
inafter described, wherein the advance and re
I20d and I20e to deenergize solenoid 61; also
turn movements of said slide may be minutely
causes contactor I20b to close to complete the
controlled both as to the speed and the extent
circuit through coil I30 and thus close contactor
of such movements.
1
I_I0a. The deenergizing of coil I20 also closes
contactor I20c, thus establishing a circuit through 55
Inching, operation of the press system
coil I I0 from line 9i to line 90, including switches
The operation of the inching control system
02 and 01, wire 94,'contactor I00a, wires I2I and
may best be understood by ?rst observing from
05. switch 15, wires 90 and III, coil H0; wire H2
‘the foregoing description, and from Fig. 5, that
and contactors i200 and "0a. This circuit
through coil IIO energizes the latter and“ thus 00 energizing of coil IIO with the resultant closing.
of contactors H01) and IIOc is'necessary in order
' c ses contactors IIIIb, IIO'c to again energize
IIO. A circuit through the latter coil, however,
,is completed only ‘when the slide, continuing to
so enoid 06.
.
;
to energize solenoid 66 to cause the valve 49 to so .
direct pumped liquid as to move the press slide
The energizing of solenoid 00 immediately after
I5 downwardly and that energizing of coil I20
the mentioned deenergizing of solenoid 61 causes '65 with
the resultant closing of contactors I206 and
the valve piston 48a to again shift to its lower
I20e is necessary to energize solenoid 6'! to op
most position to cause the pumped liquid to
erate the valve 49 oppositely, to move the slide I5
repeat the downward or advance movement of
upwardly.
,
~
the press slide. The described automatic reversal
It is helpful, also, to observe that when the
of the stroke of the slide I5 at its opposite limits
of movement thus causes the slide to reciprocate = '10 slide I5 is at the'top of its stroke, open limit
switch ‘I4 renders it impossible, by any illustrated
‘ automatically until stopped by the momentary
automatic or inching control means, to energize
opening of press button switch 92 which breaks
coil I20 to tend to urge the slide further up
all circuits. After the button of switch 92 is
wardly: and, when said slide is at the bottom of
released‘ permitting the latter to close, all cir
cuits remain broken, excepting the circuit ‘wits stroke, open limit switch ‘I! or pressure switch
a
"2,410,712
1o
.89 or both said?switches, render it impossible, by‘
'
38 so that light is again cut oil? from cell
any illustrated, automatic or inching control. f shutter
3
i,
thereby
deactivating it to open the mentioned ‘
means, to energize coil I30, and, hence, impos
downward inching circuit through coil H0. The
sible for contactor i300 to close so that coil Ill!
opening of said downward inching circuit deen
may not be energized to tend to urge the slide fur
ergizes
the coil H6 and opens contactors i I01; and
ther downwardly. The said_switches, however,
liiic, thereby deenergizing'solenoid 66 and per
do not interfere with the‘ operation of controls
mitting spring 13 to restore valve piston 59a to
causing downward movement of the slide from
its
neutral position to bring the press slide to
its uppermost or an intermediate positionrtor
with the operation of controls causing upward 10
movement of the slide from. its lowermost or an
intermediate position. ‘
'
‘
rest.
.
_To inch the slide upwardly, the operator turns
the wheel 22 to move the nut l8 upwardly to the
extent of, say, three-fourths of an inch, carry
'
'It may also be observed that in the connec
ing the bottom edge of shutter 38 upwardly clear
tions between lead 93 and coils! l0 and I20, re
of the path permitting light rays to pass from
spectively, there are included normally closed 15 lamp
3? to cell 38, thus activating the latter to
contactors i200 and HM functioning as safe
close an upward inching circuit ‘from lead M to guards to prevent closing of a- circuit through
lead as,
one of said coils when the other coil is energized. .1 36, wire including switches 92 and 81, wire 90, cell
Md, coil I20, wire I23, limit switch ‘it,
wire 82%, and then closedcontactor Hod. This
20 circuit energizes coil I20, thereby closing con
Let it be assumed that the press‘ slide it is at
tactors lied and me to energize solenoid 61 and
rest in its uppermost or in an intermediate posi
These contactors also function similarly assai’e“
guards in automatic operation of the press.
'
tion and that it is desired to move the slide down
wardly an inch or a fraction thereof at, a time,
within- absolute‘ control of ‘the operator, as a
. part of the setting of dies in the press. The
cause the ‘slide it to move upwardly in the man
. her already described.
Thereafter, the press slide i5, in moving up
as" wardly to the same extent as .the upward move
operator ?rst sets the run-jog switch 8‘! at “Jog”
position. This, through the medium of controls
hereinafter described, causes the slide IE to move
to and come to rest automatically at an aligned
position relatively to the traveling nut i8 in which .30
position the shutter 38 closes on the light paths
from the lamps 32, 31 to related cells 3!, 36, re
spectively.
The said nut, at that time, would‘
_
‘ordinarily be at a point on the upper portion of 35
the screw is where the operator probably would
have left it after previously using the inching
controls. If the slide happens to be in such
aligned position when the operator sets the
position, the slide will remain
in that position pending further manipulation of
the inching controls by the operator.
*
The setting of the switch 8'! at “jog” position,
ment of the nut it (three-fourths of an inch
in the present illustration), carries the cell assem
blies to their original positions relatively to the
shutter 38 so that light is again cut oil from cell
dd, thereby deactivating it to open the mentioned
upward inching circuit through coil I287. The
opening of said upward inching circuit deener
gizes the coil I29 and opens contactors IZEId and
woe, thereby deenergizing solenoid 57 and per
mitting spring 73 to restore valve piston tea.
to its neutral position to bring the press slide
to rest.
I
The foregoing explanation presupposes that the
operator will cause the nut E8 to move upwardly
or downwardly only a short distance at a time or "
only slightly in advance of the press slide i5
vwhich, in inching operation, will follow the nut.
Recognizing the possibility, however, that an op
. establishes a lighting circuit which, 'when the slide is is in the mentioned aligned position, ex 45 erator might turn the wheel 22 so rapidly as to
cause the shutter to move far ahead of the press
_ tends through incandescent lamps 32, 31,. from
-
'
flead 9! to lead 93, including switches92 and 8?, _
and wire' 90, from which two parallel circuits are
‘ carried to lead 9 I ; one parallel circuit extending
slide and consequently uncover both cells, ren
dering the inching controls inoperative for a time,
the toggle switches 28, 29, shown in the drawings
in closed positions indicated in full lines, are so
through wire 88, then closed toggle switch 28,
50' arranged that if the nut l8 moves upwardly sub
wire 89, lamp '32,
and wireldll, to lead 93, and
stantially in advance of the slide [5, the pin ti
the other parallel circuit extending through wires ', engages the operating arm of toggle switch ‘28
98 and idi, then closed toggle switch 29, wire M2,
and opens the latter, the e?'ect of which, as may
lamp 3?, and wire M0, to lead 93.
~
be seen from Fig. 5 is to break the circuit through
The operator then turns the handwheel 22, 55 lamp 32 and thus render cell 3| inoperative while
preferably quite slowly, to cause the nut l8 and
cell 35 remains subject to lighted lamp 31. The
the shutter 38 to move downwardly on the screw
follow-up movement of the slide 15 causes the
is. This causes the top edge of said shutter to
switch 28 to be closed again as the slide ap
proaches the position wherein the shutter again
move downwardly clear of the path permitting
light rays to pass from lamp 32 to cell 3!, thus 60 closes at? the light to both cells. The pin 4! func-,
tions in a similar manner to open switch 29 and
activating the latter to close a downward inch
render cell 3-6 inactive if, the nut I8 is moved
ing circuit from lead 9| 'to lead 93, including
downwardly substantially in advance of the press
switches 32 and 81, wire 90, cell 3i, wire M3, coil
slide and to close said switch again as the result
H9, wire H2, and then closed contactors l??c
and little. This circuit energizes coil H0, there 65 of the follow-up movement of the press slide.
‘ The described characteristic operation of the.
by closing contactors Hllb and Hilc to energize
solenoid 6t and cause the slide IE to move down
. toggle switches 28, 29 serves to yield the previous
1y mentioned automatic movement of the slide iii
wardly in the manner already described.
If the operator hasturned‘the wheel 22 only 70 to aligned position relatively tothe nut l8 when
the operator sets the switch 81. to “jog” position
to such an extent as to cause a downward move
to start inching operation. It should be clear
ment of the nut I 8 of, say, one inch, upon the
that, when the press is in running operation, the .
screw IS, the press slide IS, in moving downwardly
_ toggle switch 29 is closed and the toggle switch
to the extent of one inch carries the cell assem
blies to their original positions relatively to the 75 28 is opened by “the pin 4! as the slide 15 moves
' downwardly to and below a position of substan
.
2,410,712
11 -
tial alignment relatively to the nut i8; and as
the slide moves upwardly to and above such
aligned position the said pin closes switch 28 and
opensswitch 29. Hence, it the slide is notin the
7 comprising first operating means adapted to op
erate the said electrical control means to derive
‘such normal operation of the tool-carrying mem
' ber, and second operating means, adapted to-op-v
erate said electricalcontrol means to derive inch
mentioned aligned position when the operator
sets the switch 81 at "iog” position, the men
tioned setting of the latter switch serves to light
only one otthe lamps 32 or 31 so that only the
.cell 3| or 35, which will yield the proper direc
-tion_ of movement_ of the slide to bring the latter
to such aligned position, will be activated to auto
in: operation ‘of the tool-carrying member, the
. said second operating means having portions
'thereof- constrained at all times to move in uni
. son with said ‘member, and an element, movable
manually independently of the mentioned por
tions and arranged to coact with the latter, in re
sponse to such manual movement, to initiate
matically achieve such alignment. This auto
matic initial movement of the slide to aligned
position, at the beginning of inching operation,
is advantageous in facilitating operation of the
press.
,
'
12
for controlling the movement of said member,
movement of the'tool-carrying member and to
coact with said portions in response to the latter
' movement of said member to terminate move
ment of the tool-carrying member.
‘
It is evident from the foregoing description
2. In a ?uid-actuated device having a, ?uid
‘ that an operator of the disclosed pres system
actuated reciprocating tool-carrying member
adapted 'in normal operation to execute relatively
rapid uninterrupted movements; control means,
may convertthe controls, as between automatic
or semi-automatic and inching operation, merely 20
by shifting the setting oi run-iogswitch 81; also
that the present invention affords such precise
control of partial movements of the press slide
that the latter may be caused to move to’ sub
including electrical apparatus, partly carried
upon said member for controlling the movement
of said member, comprising primary operating
means adapted to operate the said control means
stantially the same minute extent that the nut. 25 to derive such normal operation of the tool
I! may be moved.
carrying member and secondary operating means
adapted to operate said control means to derive
'
In order to render the disclosure of the pres
ent invention as free of complexities as possible,
consistent with a complete understanding there
manually limited movement of_ the tool-carrying
member, the said secondary operating means in
‘ oi, the several photoelectric cells have been illus
cluding a second member manually movable in
trated and described as connected directly in the
circuits of the relay coils H8 and 120. Persons
familiar with such cells will readily understand,
however, tht photoelectric cells, suitable for use
in the present invention, may be connected in
- dependently of said tool-carrying member and
adapted to coact with portions of said electrical
apparatus ‘carried upon said tool-carrying mem
ber, in response to movement of the said second
member, to operate said apparatus whereby to
derive movement of the said reciprocating mem
ber to an extent dependent upon the extent of
circuit with suitable ampli?ers and the latter
, may be connected in the circuits or the said relay
coils.
.
The second embodiment
Fig. 6 illustrates an arrangement wherein an
’
' movement of said second member.
3. The combination according to v‘claim 2,
40 further
characterizedin that said electrical ap
paratus includes a photoelectric cell, carried upon
_ gularly disposed mirrors I", I“ may be ?xed
upon the extension 21 on one end of the press
one of said members, and in that a shutter mem-v _ _
ber is carried upon the other of said members
and adapted to control the operation of said cell
in response to relative movement of the said tool
slide in such position that, except as closed oil
by the shutter 38, light rays from the lamps 32, .
31 may pass to their respective related cells 3|,
36,‘ The cell 3| and its housing may be ?xed
carrying member and the mentioned second
member.
4. ‘The combination according to claim 2,
in a suitable position upon the crown l3 of the -
press and the cell 36 and its housing may be ?xed
further characterized in that mechanically op- in a suitable position, upon the bed ll of the 50 erable portions of said electrical apparatus are
, press. The positioning of the cells on ?xed por
carried upon vone of said members, and are
tions of the press renders them less likely to be
adapted to be operated by a portion of the other
- damaged by‘ shocks and heavy vibrations which
of said ‘members. '
may be set up in the slide l5 during operation
5; A hydraulically actuated device comprising a
or the press. -
' liquid-actuated 'reciprocable tool-carrying mem
'
In the second embodiment; the same arrange
ber adapted in normal operation to execute rela
ment of toggle switches 28, 28 may be employed
tively rapid uninterrupted movements, electrical
to function the same and with the same results
control means partly carried upon said member
for controlling the initiation of supply of liquid,
actuating said member, whereby to initiate move
ment ‘of the latter and for controlling the ter
mination of such liquid supply whereby to ter
described with reference to the ?rst embodiment
of the invention. Indeed, all parts of a press
system employing the second embodiment, ex
' cepting the parts illustrated in Fig. 6, may be the
,
same
as those illustrated and described with ref
' urinate, the movement of said member, ?rst op
erence to the first embodiment and may function 65 erating means adapted to operate said electrical
in a similar manner.
‘
'
It should be understood that this invention may
lie-employed in various types of press systems -
control means to derive such normal operation of
the tool-carrying member, and second operating
means comprising a second member operably
andmay be modified in many respects while, nev-'
movable, independently 'of ,said tool-carrying
erthe'lessremaining within the invention as de 70 member under minute manual control, along a
fined in-the following claims.
a
.
What I claim is:
" in: Ina ?uid-actuated device having a?uid-actu
, ated reciprocating tool-carrying member adapted
‘ in normal operation to execute relatively rapid un
_ interrupted movements;
electricallcontrol means
course substantially parallel to the course of
movement of the latter member, and adapted to
coact with portions of the electrical control means
carried upon-said tool-carrying member in re
75 sponse to a variation in the relative positions of
2,410,712
14
the two said members, whereby to operate the
extent dependent upon the extent ofpsuch move
electrical control means to start said tool-carry
ing member and stop it precisely at a desired in
termediate point in its stroke.
' 6. A hydraulically actuated device comprising'
a
liquid-actuated _ reciprocable
ment of the said second member.
, '
9. A device according to claim 8, further char
acterized in that the said make and break mech
anism comprises a photoelectric cell, and the said
second member has a shutter element mounted
thereon and adapted, in said one relationship, of
tool-carrying
member adapted in normal operation to execute
relatively rapid uninterrupted movements, elec
_ the‘ two members, to so in?uence said, cell as to
trical eontrol'means partly carried by said mem~
yield no resulting movement of the slide member,
ber for controlling the termiation of the: supply lo and being further adapted, upon movement of
of actuating liquid to‘ said member, whereby to
terminate the latter’s movement, ?rst operating
- said second member from said relationship, to so
in?uence said cell as to cause a. following move
ment .of the slide member to an extent dependent
upon the\ extent of such movement of the ‘said
means adapted to operate said electrical control
means to terminate the movement of said member
at the end of a substantially full stroke, and sec 15
second
ond operating means, for operating said control
means, comprising a second member operably
member.
.
-
F
-
Y
10. A device according to claim 8, further char
acterized in that the said make and break mech
anism comprises a pair of photoelectric cells, and
movable, independently of said tool-carrying
member under minute manual control, along a
course substantially parallel to the course of
movement of the latter member, and adapted to
mounted thereon and adapted, in said one rela
coact with portions of the said control means car;
said cells to yield no resulting movement of the
the said second member has a shutter element
tionship of the two members, to‘ coact with both
ried upon said tool-carrying member, in response
slide member, and being further adapted, upon
to movement of the latter to an extent dependent
upon the extent of a preceding movement of said
movement of said second member in one direc
tion from said one relationship, to so in?uence
second member, whereby to terminate the move‘
ment of the tool-carrying member precisely at'a
desired intermediate point in its stroke.
7, In a hydraulically actuated device having a
, of the slide member in the same direction, and
tool-carrying slide member adapted in normal
operation to execute relatively rapid uninter
so in?uence the other of said cells as to cause a
rupted movements, ram means connected to and
adapted to move said slide member, and'liquid
said opposite direction.
one of said cells as to cause a following movement
adapted. upon movement of said second member
in an opposite direction from said relationship to
following movement of the slide memberlin the
‘
'
_ 11. In a, hydraulically actuated device having a.
control means for controlling the delivery ' of
member, and 'a ram connected to and
liquid to said ram ,whereby to control the move 35 'slide
adapted to move said slide member; control
ment of the slide member; primary control
means, including electrical apparatus, for con
means, including electrical apparatus, for con-'
trolling the delivery of liquid to said ram where
trolling the operation of the said liquidicontrol I by to control the movement of said slide mem
means to derive such normal operation, and sec
ondary control_ means comprising a second mem
ber, the said control means comprising a make
and break mechanism, adapted to 'control said
40
ber, operably movable relatively to' said slide
member’ under minute manual control; portions
of said electrical apparatus being carried by one
of said members and being adapted to be op
erated, in response to relative movement of said
two members, by a portion of the other of said
electrical. apparatus, a second member; operably
movable relatively to said slide member, and hav
ing a, portion coacting with the make and break
mechanism, in one relationship of the two mem
bers, to render the control means ine?ective to
yield movement of the slide member, and being
adapted, upon movement of the said second mem
ber from said relationship, to coact with said
members whereby to derive minutely controlled
inching movement of said slide member.
'
. 8. In a hydraulically actuatedv device having a
tool-carrying slide- member adapted in normal
make and break mechanism whereby to cause
a following movement of the slide member to an
extent dependent upon the extent of such move
50
operation to execute relatively rapid uninter
rupted movements, and a ram connected to and
ment of the'said second ‘member, the said make
and break mechanism, further, comprising two
adapted to move said slide member?‘ control
means. including electrical apparatus, for con-.
photoelectric cells adapted to control movement
trolling the delivery of liquid to said ram where 55 of the press slide in opposite-directions, a shutter
by to control the movement of said slide mem
element on said second member‘adapted to con
ber, ?rst operating means adapted to'operate the
trol the activation and deactivation of said cells,
said electrical, apparatus to derive such normal
separate switches, each connected in circuit with
operation of the slide member, second operating
one of said cells, and'a portion of said second
means adapted to operate the said electrical an 60 member adapted, when the shutter element
paratus to derive inching operation of the slide
changes the condition of one of said cells, to' op
member; the said second operating means com
prising a make and break mechanism, adapted to
control said electrical apparatus, and a second
member, operably movable relatively to'said slide
member under minute manual control, and’ hav
ing a portion coacting with the make and break
mechanism, in one relationship of the two mem
bers, to render the control means ineffective to }
yield movement of the slide member, and being
adapted, upon movement of the said second mem
ber from said relationship, to coact with said
make and break mechanism whereby ~to cause a
following movement of the slide memberito ‘an
erate the said switch in circuit. with the other of
' said cells, whereby to render the latter non
responsive to the shutter element.
I
12. In a hydraulic presshaving a reciprocating
tool-carrying slide, adapted in normal operation
to execute relatively rapid uninterrupted move
merits, and a ram connected to and adapted to
move said slide; primary control means for yield
ing such normal operation, inching control means
comprising an electrical make and break mech
anism carried ‘by said slide and adapted'to coact
with said primary control means to control the
'inchinr.r movement of the slide, a rotatable screw
extending substantially parallelv to the line of
2,410,712
movement'oi said slide, a nut threaded upon said
screw and restrained against rotation whereby to
be moved along said screw under minute control
in response to rotation thereof, and a portion of
said nut being adapted, upon ‘such, movement of
the latter from an initial relationship to the slide,
to coact with said make, and break mechanism to V
initiate a following movement of the slide, and
16
-
' mentioned portion of said nut, comprising a.shut
. ter element adapted to control the passage or light
to said cells in response to-relative movement of
the said nut and the press slide, the inching con
trol mechanism including separate switches, each
connected in circuit with one of 'said cells, and‘
the said nut comprises a second portion adapted,
substantially when one oi said cells is rendered
e?ective to derive movement of the press slide, to
an extent dependent upon the movement of the 10 coact with the switchv in circuit with the other '
, further adapted, upon movement of the slide to
’nut, to again coact with said make and break
mechanism whereby to terminate such following
movement.
.
I
of said cells, to render the latter non-responsive
to continued movement of said nut. '
"
16. In a hydraulic, press having a reciprocating
.
slide, a ram connected to and adapted to move 7
13. Control means according to claim 12, further
said slide, and a hydraulic system adapted
15
‘characterized in that the make and brake mech
to direct liquid under pressure upon either of
anism comprises a-photoelectric cell adapted to
, opposite surfaces of said ram‘to derive movement
control the movement of the press slide, and the
of the press slide in either of opposite directions;
mentioned portion of said nut comprises a shutter
electrical inching control means for controlling
element adapted to "control the passage of light
to said cell in response to relative movement of 20 the hydraulic system to derive such opposite slide
movements comprising a pair of photoelectric
the said nut and the press slide.
cells carried by said slide and adapted to selec-v
14. In a hydraulic press having a reciprocating
tively control the said electrical means to yield
slide, and a ram connected to and adapted to
such opposite slide movement, a rotatable screw
move said slide; inching control mechanism com
extending substantially ‘parallel to the line of“
25
prising an electrical make and break mechanism
movement of said slide, a nut adapted to move.
carried by said slide and adapted to controlrthe
along said screw‘ in response to rotation of the
movement thereof, a rotatable screw extending
‘latter,
a shutter element carried by said nut and
substantially parallel to the line of movement of
adapted to control the passage of light to said
said slide, a nut threaded upon said screw and
restrained against rotation whereby to be moved 30 cells, separate switches,‘ each connected in cir
cuit with one of said cells, and a switch-actuating
along said screw in response to rotation thereof,
element
carried by said nut, whereby movement
and a portion of said nut being adapted, upon
of said nut from an initial position relatively to
such movement of the latter from an initial rela
said slide renders one of said cells operative to '
tionship to the slide, to coact with said make
yield a following movement of_ the slide in a
35
and break mechanism to initiate a following
movement of the slide, and further adapted, upon
~ movement of the slideito an extent dependent
similar direction,
and causes the said switch- -
actuating element to coact with the switch in
circuit with the-other of said ‘cells, to render the
upon the movement of the nut, to again coast
latter non-responsive to continued movement of
with said make and break mechanism ‘whereby
'
‘
to terminate such following movement, the said 40 said nut. _
17.‘ A ?uid-actuated device having, a ?uid
make ‘and break mechanism comprising a pair
actuated reciprocating tool-carrying member
of make and break devices adapted to control the
adapted in normal operation to execute relatively
movcment'of the press slide in opposite directions,
the inching control mechanism also including 45 rapid uninterrupted movements and electrical
for controlling the normal operation and
separate switches, each connected in circuit with . means
the inching operation of said member, the said
one of said make and break devices, and the said
control means ‘comprising photoelectric means
-nut also comprising a second portion adapted‘,
constrained
at all times to move in unison with
when said nut is moved in one direction, to coact
said member and adapted to coact with said
- with the switch in circuit with the device con
trolling movement-of the slide in the opposite
direction, to render the last mentioned of said
devices non-responsive to further movement of
50 electrical means to yield‘ inching operation or said
member, light-source means disposed imposition
to throw light uponsaid ‘photoelectric means, a
second member manually-movable independently .
of said tool-carrying member,and a shutter con-1
15. In a hydraulic press having a reciprocating
slide, and a ram connected to and adapted to 65 strained at all times to move in unison with said
second member and adapted 'to control the
move said slide; inching control mechanism com
passage of light to said photoelectric means in re- .
prising an electrical make and break mechanism
sponse to movement of said second member, to
-4 carried by said slide and adapted to control the
said nut.
,,
yield a following movement of said tool-carrying,
movement thereof, a rotatable screw extending
member to an extent dependent upon the said
60
substantially parallel to the line of movement of
movement of the second member.
, t
said slide; a nut threaded upon said screw and
18. A ?uid actuated device comprising a ?uid
restrained against rotation whereby to be moved
actuated reciprocating tool-carrying member;
along said screw in response to rotation thereof,
controls, including electrical apparatus, for con
and a portion of said nut being adapted, upon 65 trolling
the inching operation of said device; con
such movement of the letter from an initial rela
trols for controlling operation other than inching
tionship to the slide, to coact with said make and
operation of said device in which other operation
break mechanism to initiate a following move
.the said die-carrying‘ member. is adapted to
ment of the slide, and further‘ adapted, upon
execute relatively rapidv uninterrupted move
movement of the slide to an extent dependent
ments;
and readily changeable means for con
70
upon the movement of the nut, to again coact
verting control of the device as'between the men
with said make and break mechanism whereby to
tioned types of operation thereof; the said inch
_ terminate such following movement, the said
ing operation controls including a member, op
‘ make and break mechanism comprising a pair of ; 1
erably movable independently of theisaid tool
photoelectric cells adapted to control the 'move
the
75.
carrying
member under‘ minute manual control.
ment of the press slide in‘ opposite directions,
i7
2,41o,71a
i
and adapted to coact with portions of said
said member, an electric circuit through said
electrical device, ?rst circuit-control means
adapted to operate said circuit substantially upon
termination of a stroke of said member whereby
electrical apparatus in_ response to relative’ move
ment of the two said members, whereby to con
trol minutely the inching movement of the said
tool-carrying member, the device being further 5 to control the operation of said electr.cal device
characterized in that the mentioned inching op
to stop said member, and second circuit-control
eration controls comprise a photoelectric cell
assembly, which, when the said reciprocating
independently of said tool-carrying member, and
member is in a position other than in substan
a second portion constrained at all times to move
means having a ?rst portion manually movable
tial alignment relatively to said independently 10V in unison with the tool-carrying member, 'the
movable member, is adapted to cause movement v said second circuit-control means being adapted
of the said reciprocating member to such aligned
to operate said circuit at any intermediate point
position, in response to changing of the said con
in the stroke of said member, in response to rela
trol converting means to a condition controlling
tive movement of the mentioned two portions of
inching operation of the device.
15 the second circuit-control means, whereby to op
19. A ?uid actuated device comprising a ?uid
erate the said electrical device to derive inter
actuated reciprocating tool-carrying member;
controls, including electrical apparatus‘, for con
trolling operation other than inching operation
mediate movement of said member to an extent
dependent upon the extent of independent move
ment of said second circuit-control means.
of said device in which other operation the said 20
21. The combination according to claim 20,
die-carrying member is adapted to execute rela
further comprising an electric selection switch
tively rapid uninterrupted movements ; and
readily changeable means for converting control
adapted to render either. of said circuit-control
' means operative and the other thereof inop
of the device as between the mentioned types of
erative.
22. The combination according to claim 20,
further characterized in that the mentioned sec
ond portion of the second circuit-control means
comprise photoelectric means adapted to modify
said electric circuit to control the operation of
said electrical device and said flow-control means,
and the said ?rst portion o'i the second circuit
operation thereof; the said inching operation
controls including a member, operably movable
independently of the said tool-carrying member
under minute manual control, and adapted to
coact with portions of said electrical apparatus in
response to relative movement of the two said
members, whereby to control minutely the inch
ing movement of the said tool-carrying member,
control means comprises a shutter adapted to
the device being further characterized in that the
control the passage of light to the photoelectric
mentioned inching operation controls comprise
means.
two photoelectric cells adapted to control move 35
23. The combination, in a ?uid-actuated device
ment of the tool carrying member in opposite
having a ?uid-actuated reciprocable tool-carry
directions, a shutter carried by said independently
ing member and means for varying the flow of
movable member and adapted to control the
?uid to said device for governing the reciproca
passage of light to said cells, and separate
tion of said member; of electrically operable
switches, each connected in circuit with one of an means for operating said ?ow-varying means to
said cells; a portion of the said independently
derive movement of said member in opposite
movable member being adapted to open one of
directions, an electric system associated with said
said switches to render inoperative the cell in cir
operating means, ?rst circuit-control means‘
cult therewith when the tool-carrying member
moves in one direction beyond a position of sub
stantial'alignment with the independently mov
able member, and to open the other of said
switches to render inoperative the cell in circuit
therewith when the tool-carrying member
adapted to operate said system whereby to con
45 trol the operation of said operating means to
derive uninterrupted movement of the member
through a substantially full stroke in either of
opposite directions, and second circuit-control
means including photoelectric means and shutter
moves in the other direction beyond a position 50 means, coacting therewith, one of the two last
of substantial alignment with the independently
recited means being constrained at all times to
movable member, thereby leaving, subject to
move with the toot-carrying member, and the
activation, only the one cell adapted to control
other of said two last recited means being
the movement of the tool-carrying member in the
manually movable independently of said tool
direction which, when the control converting 55 carrying member in opposite directions, and
means are shifted to the setting yielding inching
adapted to modify the-operation of said photo
operation, causes the tool-carrying member to
electric means, and thereby operate said system,
move automatically to a position of substantial
at any point in the stroke ofsaid tool-carrying
alignment with the mentioned independently
movable member.
;
, 20. The combination, in a ?uid-actuated device
having a ?uid-actuated reciprocating tool-carry
to
member in either direction, in response to rela
tive movement of said shutter means and ‘the
tool-carrying vmember, whereby to derive move
ment of the latter member to an extent and
ing member and means for controlling the flow of
direction independent upon the extent and direc
fluid to said device for governing the movement
tion of independent movement of said inde
of said member; of an electrical device for. operat 65 pendently movable means.
.
ing said ?ow-control means to start and stop the
EARL CANNON. ,
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