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Патент USA US3082735

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March 26, 1963
3,082,725
E. CANNON
PRESS
‘Filed March 19, 1959
2 Sheets-Sheet 1
25
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INVENTOR.
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AT TQRNEY
March 26, 1963
E. CANNON
'
Filed March 19, 1959
3,082,725
PRESS
2 Sheets-Sheet 2
‘ATTORNEY
United States Patent O?hce
PRESS
withdrawal of the movable pressure exerting part relative
to the other pressure exerting part.
,
‘My invention has for one of its obects to eliminate the
Earl Cannon, Birmingham, Mich., assignor of one-fourth
commonly provided clutch in the conventional crank or
to Freeman Crampton, Toledo, Ohio
Filed Mar. 19, 1959, Ser. No. 800,576
16 Claims.
Patented Mar. 26, 1963
2
1
3,082,725
3,082,725
(Cl. 113—38)
eccentric driven mechanical press, while using a press
drive power means of conventional low cost power deliv
‘
ering capacity.
In the ?eld of mechanically actuated pressure exerting
machines, my invention teaches the construction of what
My invention concerns pressure exerting machines,
such as those adapted to draw, out or form a work blank.
More particularly, my invention deals with a machine 10 may be called a “clutchless” press. A so called “clutch
less” press is one in which the movable pressure exerting
of the type mentioned having a movable pressure exerting
part is directly connected to a constantly'applied source
part that is advantageously maintained in constant mo
of power, such as the driving motor. However, in order
tion, even while a work blank is being fed or withdrawn
to load or remove work in the conventional clutchless
from the machine.
The advantages to be realized from arrangements in 15 press, it has been necessary to stop the motor when the
which the movable pressure exerting part is in constant ' pressure exerting parts were apart and then restart the
motor to resume operations.
motion are manifold. Among these advantages is that of
Another object of my invention is to provide a pressure
eliminating operable connections, such as clutches and
exerting machine, such as a press, having a short power
the like, between the driving source of power and the
movable pressure exerting part. These connections are 20 and work forming stroke of its movable pressure exerting
part, permitting moving the movable pressure exerting
not only costly but in their function are subject to rapid
member at a high speed, particularly in the power or
wear and high maintenance cost. In addition, a pressure
exerting part in constant motion takes full advantage of
kinetic inertia of the masses involved and in movement
to e?iciently utilize the power applied to and through
the part to perform the pressing work. This, besides
increasing ef?ciency, can also produce a more desirable
continuity of movement in the movable pressure exert
ing part, a characteristic oft-times of importance in deep
drawing of metal.
work forming stroke.
-
Still another object of my invention is to provide a pres
25. sure exerting machine, such as a press, having a pair of
pressure exerting parts of which one is movable relative
to the other and in which the stroke of the movable
toward the other pressure exerting part may be used
entirely in producing pressure on the work. .When this
30 objective is met in a mechanically driven press, a shorter
One great disadvantage of machines of the type men
tioned having pressure producing parts in constant motion,
however, resides in the limitation that such constant mo
tion places upon feeding and withdrawing of a work
'blank to and from the machine. If production speed is
the desired goal, so that the machine must be operated
at high speed, theopening and shutting time between the
‘ crank may be used to secure a more rigid drive to obtain
greater working pressure available at the mid-stroke
phase of movement of the movable pressure exerting
part toward the other.
A still further object of my invention is to provide a
pressure exerting machine having a constantly moving
movable pressure exerting part, allowing, notwithstanding,
long periods of work blank ‘feed.
pressure exerting parts is usually insu'?icient to get suc
A still further object of my invention is to provide, in
cessive work blanks to and from between the parts.
It is therefore essentially the purpose of my invention 40 a pressure exerting machine having two pressure exerting
to propose a structure by which the advantages hereto
fore mentioned, as well as others, may be enjoyed by
the art, without sacrir?ce to the disadvantage mentioned
or to other disadvantages inherent in machines in earlier
use.
parts of which at least one is a movable pressure exerting
part, an independently operable plurality of operable
means for moving the movable pressure exerting part rela
tive to the other pressure exerting part, the compound
45 operation of said means being determinative of the time
and distance that the movable pressure exerting part
My invention, in summary, so far as it concerns a pres—
moves toward and away from the other pressure exerting
sure exerting machine, resides in an arrangement of means
‘ art.
and parts in a pressure exerting machine having a pair of
pressure exerting parts of which, at least, one is movable 50 p ‘One of the more ‘speci?c objects of my invention is to
provide a pressure exerting machine that, when adapted
and also having two operable means in tandem relation,
to the metal forming arts, may be used to good advantage
operatively speaking, connected to and ‘for moving the
movable pressure exerting part relative to the other pres
sure exerting part and a source of power operatively con
not only in blanking and drawing but also to die forging.
When so adapted to the last mentioned type operation, em
- exerting part relative to the other pressure exerting part
bodiments of my invention have the advantages of elimi
nating clutch di?‘iculties so prevalent in such apparatus
and, because of the short power work-performing stroke
possible, deliver a rapid series of strokes to the work from
a much more rugged backing structure notwithstanding
the greater potential ability to withdraw the hammer fur
ther to allow work removal and loading than is possible
in machines of the prior art.
Another of the speci?c objects of my invention is to
provide, in a pressure exerting machine having a pair of
pressure exerting parts of which at least one is movable
adequately to allow work blank loading between the parts.
relative to the other, an arrangement of a pair of means
nected to one of the operable means to produce continuous
motion of that means and to the other operable means to
produce intermittent motion of that means in synchrony
with the continuous motion of the ?rst mentioned means,
the continuous motion of the ?rst mentioned means being
capable of accomplishing a power-pressing and work
blank forming stroke of the movable pressure exerting
part and the intermittent motion of the second mentioned
means being capable of withdrawing the movable pressure
for moving the movable pressure exerting part relative
to the other of which means, one is intermittently operat
sure exerting machine of the kind mentioned, the inven
ing under only nominal or no load and thus easily started
tion resides, in summary, in an arrangement by which the
two means for moving the movable pressure exerting part 70 and stopped and the other means is continuously operating
and capable of exerting a high degree of work pressure
toward or away from the other pressure exerting part
In so far as my invention concerns a drive for a pres
operate coincidentally to produce orderly advance and
and is rendered effective relative to the other pressure ex
3,082,725
3
erting part, however, only when positioned to do so by
the intermittently operating means.
. _
My invention has for further objects those of providing
other advantageous structures and arrangements which will
appear from the following description and from an exami
nation of the accompanying drawings. Pressure exerting
machines containing my invention may take various forms,
~ one of which, now appearing to me to be the best mode of
carrying out my invention, is described hereinafter and is
4
able pressure exerting plunger part 13 and the ?xed pres
sure exerting bed and bolster part 16 and 17.
In order to counterbalance the weight exerted by the
plunger 18 tending to cause the plunger to fall, inde
pendent of being driven to a position of work with the
bed supported bolster 17, a plurality of well known coun
terbalance air cylinders 21) are provided. The cylinders 20
are mounted on the crown 14 and by rods 21 are connected
to the plunger 18. The movement of the plunger 18 to
shown in accompanying drawings. In making such de 10 ward the bed 16 and 17 is thus made a consequence, in
scription and referring to the drawings during the course
part, of the position of a slide 22 with reference to the
thereof, I do not imply that I am unaware that there are
bed 16 of the press.
variations from the structure described or shown which
The slide 22, like the plunger 18, extends between the
also embody my invention nor do I disclaim such vari—
uprights 12 in a position between the plunger 18 and the
ations as beyond the contemplation of my invention made 15 crown 14. The slide 22 slidably engages the ways 19
manifest herein.
and is movable along such ways. To counterbalance the
FIG. 1 of the accompanying drawings illustrates a view
weight of the slide 22, a suitable air cushion means 23,
of a front elevation of a pressure exerting machine em
well known in the art and mounted on the crown 14, is
bodying my invention. The particular pressure exerting
connected to the slide 22 by a rod 24. The slide 22, in
machine selected by me to illustrate the invention is a 20
order to effect movement of the plunger 18, relative to
mechanical sheet metal press.
the bed .16‘ is connected to the plunger.
FIG, 2 of the drawings illustrates an end view of the
The means for connecting the plunger 18 to the slide
pressure exerting machine shown in FIG. 1, shown par
22, in the form shown, comprises a pair of links 25 which,
tially cut away and showing certain parts of the machine
by straps 26, are connected to eccentric shafts 27 jour
after they have moved from the positions thereof shown
25 nalled on the slide 22. It will be seen that rotation of
in FIG. 1.
the shafts 27 will cause the links 25 to reciprocate the
FIG. 3 of the drawings illustrates an enlarged view of
plunger ‘18 relative to the slide 22 and the bed 15 and
one of a pair of timers shown in FIG. 1 that are adapted
bolster 17.
for initiating movement of the movable pressure exerting
To drive the shafts 27, I provide a constant operating
part moving means, ?rst in one direction and subsequently
electric motor 28. The motor 28 is suitably mounted on
in the other direction, relative to'the other pressure exert
the slide 22 and by gear trains having gears 29 is opera
ing part.
tively connected to each of the shafts 27. The motor
FIG. 4 of the drawings shows an enlarged perspective
28 receives power from the source of power S through
view of a second pair of timers, shown in FIG. 2, that are
one of the circuits which will be described later herein.
adapted for terminating movements initiated by the pair
of timers mentioned in describing FIG. 3 of the accom 35
The elfectiveness of the plunger 18 in its motion, due
panying drawings.
to the rotation of the shafts 27, in doing work on a ‘work
FIG. 5 of the accompanying drawing illustrates, dia
grammatically, the circuits by which motors shown in
induced by each of the two movable pressure part moving
blank, depends upon the position of the slide 22 in rela
tion to the bed 16 and bolster 17. Hence, I provide means
for moving the slide 22 which I shall now describe. Pref
erably, the uprights 12 have openings 30 that extend verti
cally and lengthwise of the uprights. The slide 22 has
extensions 31 at opposite ends of the slide that extend
through the openings 30. The extensions 31 mount pins
means.
32 that each pivotally engage one end of one of two links
FIGS. 1 and 2 of the drawings are driven and controlled
by the timers shown in FIGS. 3 and 4 of the drawings.
FIG. 6 is a motion diagram showing the timed relations
between individual and a composite of the movements
The embodiment of my invention, selected for'pur
33 extending vertically and exterior of the uprights 12,
poses of illustration, comprises a mechanically driven
from a point on one side of the bed 16 to a point on the
sheet metal press 10 driven by suitable power means that
are operatively connected to the source of power S and
opposite side of the bed 16. The links 33 are pivotally
connected by pins 34 to cranks 35 mounted on shafts 36.
The shafts 36 are journalled, as at 37 on the base 11.
controlled by circuits by means of two pairs of structurally
50 Intermittently operated electric motors 38 and 381, re
similar timers 140 and 1400 and 170 and 1700.
ceiving power through the circuits to be hereinafter de
The Sheet Metal Press 10
scribed and mounted on the base 11, serve to drive and
The pressure exerting machine, shown in the accom
rotate the shafts 36 through suitable gear trains having
panying drawings, is of the type commonly referred to as a
gears 39 mounted on the base 11.
mechanically driven, eccentric operated, sheet metal press
Thus, when the shafts 36 are rotated the links 33, con
and is generally indicated at 10. This press has a base 11
nected to the slide extensions 31, will be drawn in one di
from the opposite ends of which suitable uprights 12 ex
rection relative to the base 11, such as toward the base
tend vertically to support a crown 14. The base 11,
and then moved in the opposite ‘direction, such as away
crown 14 and uprights 12 are connected together by the
from the base 11. This will move the slide 22 from a
usual tensioned tie rods 15, extending through the up 60 position shown in FIG. 1 of the drawings ?rst nearer the
rights 12.
bed 16 and bolster 17, to a position shown in FIG. 2 of
The base 11 provides a suitable bed 16 on which a
the drawings at which time rotation of the plunger driving
bolster 17 and metal forming dies and cushions (not
shafts 27 will cause the plunger 18 to engage the bolster
shown) may be located, in the manner well known in the
17 and work on a blank therebetween. When, however,
art. The bed 16, with its bolster 17, is designed to operate
as a pressure exerting part, in conjunction with a movable
pressure exerting part embodied in a plunger 13.
‘The plunger 18 extends between the uprights 12 and
the movement of the links 33 move the slide away from
the bed 16 and bolster 17 the rotation of the shafts 27
will be ineffectual to cause the plunger 18 to engage the
bolster. This will enable a work blank to be removed
slidably engages ways 19. The ways 19‘ extend along the
uprights so that plunger 18 is supported for reciprocable 70 from between the plunger 18 and bolster I17 and to be
replaced by a yet unworked work blank.
movement toward and away from the bed 16 and bolster
To summarize, in reference to the potential opera
17. Like the bed supported bolster 17, the plunger 18 may
bility ‘of the structure so far described, the pressure exert
mount metal forming dies (not shown) designed to co~
ing press 10 has, in the bed 16 or its supported bolster 17
operate with the bolster supported dies to shape work
blanks (not shown) that may be placed between the rnov_ 75 and the movable plunger 18, a pair of pressure exerting
parts in which the plunger 18 is movable relative to the
3,082,725
6
bed 16 and bolster 17; and, in the links 25', the motor 28
and the slide 22 with its movable links 33, the cranks
25- and motors 38 and 381, a pair of operable means, in
tandem, connected to the plunger 18 for moving the
same relative to the immovable bed supported bolster
part 17; the motors being operatively c-onnectable through
circuits to a source of power S to produce continuous
return principal line 54. This causes the relay coil 83 to
become energized to close the normally open relay con—
tacts 831 and 832 thereof and to open normally closed
contacts 833 and 834 thereof. The closure of relay con
tacts 831 establishes a relay hold circuit on one side
through a line 84, the lines 80 and 78, now closed master
relay contacts 751, stop switch 77, line 76 to line 53
which circuit is made to depend on the stop switch 77
motion of the motor 28 and, thus, of the plunger 18 rela—
remaining closed and on the other line 82, coil 83, line
tive to the slide 22 and intermittent motion of the motors
38 and 381, and thus of the slide 22 and the plunger 10 541, now closed relay contacts 753 and line 54. The
opening of normally closed relay contacts 833 and 834
18 so that the range of reciprocation of the plunger 18
locks out operation of other circuits which will be ex—
is at one time, one in which the plunger at one point
plained as this description progresses.
engages the bolster 17 to do‘ work and, at another time,
The closing, however, of the normally open relay con
is one in which the plunger 18 does not engage the bolster
but is rather retained so that the plunger :18 is spaced 15 tacts 832 prepares a circuit comprising principal line 53,
line 76, stop switch 77, line 78, contacts 751, line 80, line
from the bolster 17.
85, now closed contacts 832, a limit switch 86, a line 88 to
The Circuits
a relay coil 87, line 541 and through contacts 7 53 to return
The circuits, by which the motors 28 and 38 and 381
principal line 54. Line ‘88 includes in circuit two pairs of
are caused to drive the gears in gear trains 29‘ and 39, 20 normally closed relay contacts which will be identi?ed
proceed from the source of power S by way of main lines
later The excitation of the relay coil 87 causes closure
S-l, S-—2 and S-3. The main lines S—1, S-2 and S-3 are
of normally open relay contacts 871, 872 and 873. Clo
‘connected by suitable electric motor starter controllers
sure of relay contacts 871 establishes a relay holding
51 and ‘52 well known in the art to motors 28 and 38
and 381. The operations of the starter controllers 51 and 25 circuit comprising line 53 and 716, stop switch 77, line 78,
52 to effect or break such connections of the motors
with the source of power are controlled by pilot circuits
closed master relay contacts 751 lines 79 and 80 to a line
92, a line 93, line 88, relay coil 87, line 541, master relay
contacts 753 to return principal line i54.
having principal lines 53 and 54 leading from main line
Closure of the other relay contacts 872 and 873 com
S—1 and main line S-3, respectively. The flow of cur
rent through the pilot circuits is made to depend on the 30 pletes a circuit through the motor starter-controller 52
which includes principal line 53, line 93, relay contacts
position—-on or oii—of a manually operated main switch
872, motor starter-controller 52, a line 94, relay contacts
55. The switch 55, in its closed position, bridges two
873, line 541, master relay contacts 753 and return prin
pairs of contacts 56 and 57. Contacts 56, when bridged,
cipal line 54. This last named circuit energizes the motorv
connect a line 58 leading from principal line 53 to a line
59 and to the motor starter-controller 51 which by line 35 starter-controller 52 to connect motors 38 and 381 to the
source of power S. Thus, the starting of motors 38 and
60 is connected to the other principal line 54 to com
381 is made to depend on the closing of the normally open
plete the circuit back to main line S-3. Contacts 57,
limit switch 86. The construction of the limit switch 86
when bridged, connect a line 61, leading from principal
which constitutes part of the timer 140 will be described
line 53 to a line ‘62 of the circuit that operated the motor
starter-controller 52 in a desired synchrony with move 40 when the timer is later described. It will suf?ce the pur
pose of the moment to say that the limit switch 86 is,
ments of the plunger 18 produced by the continuously
operated in synchronous relation with the movement of
operating motor 28 started by the starter-controller 51.
the plunger 18 to move the slide 22 through a stroke rela
A manually operated switch 70 having two pairs of
tive to the bolster 17 and thus to bring the plunger 18 into
contacts 71 and 72 controls the ?ow of current to the
circuit operating the starter-controller 52. Line 62 from 45 a range of reciprocation relative thereto, such as a range
in which the plunger 18 engages the bolster ~l17 or dies
the main switch 55 connects contacts 57, of that switch,
thereon, at one point in the reciprocation of the plunger.
with contacts 71 of the switch 70‘. When switches 55
and 70 are closed, a circuit through contacts 71 lead
ing over a line 73, a line 74, through a master relay
coil 75 to return along principal line 54 to main line S~3
In order to disconnect the motors 38 and 381 from
the source of power S, such as when the slide 22 reaches
a desired position to support the plunger 18 for reciproca
tion through a certain range, another circuit controlled
is made. Energization of the master relay coil 75 causes
by a limit switch 96 is provided. This circuit begins with
closure and retention of normally open master relay con
a line 97 and extends from the line 80 that is connected
tact 751, 752, and 753. Relay contacts 751 by a line
. to principal line 53 and extends through the stop switch
76 and a normally closed safety stop switch 77 and a line
77 circuit previously described. Line 97 is connected by
78 connect, when closed, principal line 53 to the line
the limit switch v96, when closed, to a line 98 and to a
74 through a line 79. Those skilled in the art will at
relay coil -99 connected to the line 541 and by the closed
once recognize that in the provision of the stop switch ‘77
master relay contacts 753 to the return principal line 54.
there is a means by ,which any holding circuit through
Closure of this circuit excites the relay'coil 99 which has
the master relay coil 75 may be interrupted, notwithstand
ing a closed position of switch 70 at that time.
60 normally closed contacts 991, 992 and normally open
Relay contacts 752, through a line 88, connect the
contacts 993 and 994.
line 79 to one side of the contacts 72 of switch 70 and,
The normally closed contacts 991 and 992 operated by
through now closed master relay contacts 751, the line
the relay coil 99 are in lines 82 and 88 and their opening
78, normally closed stop switch 77 and the line 76, com
by energization of the relay coil 99, opens the circuits to
municate with the principal line 53. The remaining mas
relay coils 83 and 87. Opening of relay coil 83 circuit
ter relay contacts 753 connect, when closed, the‘ return
allows the closed but normally open relay contacts 831
principal line 54 and a supplementary return line 541.
and 832 to open and the open but normally closed relay
Thus contacts 72 of switch 70 are connected on one side
contacts 833 and 834 to close.‘ The opening of relay
contacts 832 breaks one of the circuits through relay coil
to principal line 53 through line 76, normally closed
87 and allows the closed but normally open relay con
stop switch 77, line 78 and the now closed but normally
tacts 871, 872 and 873 to open. Opening of relay con
open master relay contacts 751, lines 79‘ and 80 and
tacts 87 2 and 873 breaks the ?ow of current to the motor
master relay contacts 752. On the other side, contacts
starter-controller 53 which interrupts the flow of current
72 connect through a line 81, a line 8-2 with a relay coil
from S to the motors ‘38 and 381, allowing the slide 22
83- connected to supplementary return line 541 and
to come to rest.
through the now closed master relay contacts 753 to the
3,082,725
7
In addition, energization of the relay coil 99 in clos
ing the normally open contacts 993 and 994 establishes
circuit conditions by which the motors 38 and 381 may
be reconnected to the source of power S. The contacts
993 of the relay coil 99 connect line 97 through a line
100, a line 101 and a line 102 in a holding paralled cir
cuit around the limit switch 96. The contacts 994, closed
by energization of relay coil 99, set up a circuit from the
line 100 to a line 103 of a circuit adapted to reconnect
the motors 38 and 381 to the source S. The establish
ment of this circuit becomes important as when it is de
sired to move the slide 22 automatically in synchrony
with the momentary movement of the plunger 18 and so
that the reciprocating plunger 18 will subsequently re
ciprocate through a range of reciprocation spaced from
the bolster 17. This circuit is controlled by another
limit switch 105 in line 103. Closure of the limit switch
105 establishes a circuit allowing current to ?ow from
principal line 53, line 76, the stop switch 77, line 78,
closed relay contacts 751, lines 80, 97, 100 and 103,
through closed relay contacts 994, to and through (when
closed) switch 105, a line 106 and a relay coil 107, line
‘541, closed relay contacts 753 to the return principal line
54. The ?ow of current through the relay coil 107
closes normally open relay contacts 1071, 1072 and 1073
thereof.
Contacts 1071 are in a holding circuit, paralled to the
limit ‘switch 105 that comprises a line 109 leading from
the line 100 to lines 110 and 106 and bridging the line
103, now closed normally open relay contacts 994 and
the limit switch 105. Contacts 1072 form part of a
bridging parallel circuit to the normally closed now open
relay contacts 992.
This circuit consists of a line 111
8
motor starter/controller 52 deactivates the connection
therethrough to the motors 38 and 381 from the source
of power S and the motors stop. The slide 22 also stops,
pending the actuation of the limit switch 86 which actua
tion initiates a repeat of the cycle of operations described.
A discontinuance of a repeat in the cycle may be had
by operation of the switch 70 to open the circuits that
switch controls. However, if it becomes desirable to
stop a cycle at some intermediate stage thereof, the stop
10 button 77 may be actuated. If this should be done, after
the cycle has passed through the stage at which the limit
switch 96 has been operated, the further continuity of the
described cycle depends on actuation of a supplementary
switch 122. Switch 122 controls circuits, one of which
comprises a line 123 leading from the principal line 53,
a line 124, the line 74, main relay coil 75 and the return
principal line 54. Energization of this circuit re-estab
lishes the heretofore described circuits interrupted by
opening of the stop switch 77.
Another circuit made by the switch 122 includes a line
125 leading from line 100 and a line 126 connecting
through normally closed relay contacts 833 and the line
102 with the line 98 of relay coil 99. This circuit is paral
lel to the limit switch 96 circuit and enables the broken
25 continuity of the cycle to be picked up and continued
in the sequence and manner heretofore described.
The activations of the various limit switches 86, 96,
105, and .1118 are made to occur at times in synchrony
with phases in the movement of the plunger 18 to produce
desired “dwell” periods, operatively speaking, for loading
and unloading work blanks between the plunger 18 and
bolster 17, without interrupting the continued reciproca
tion of the plunger 18. The synchrony mentioned is ob
leading from the line 88 from a point therein between
tained by timers ‘140 and 11400 and 170 and 1700.
35
the limit switch 86 and contacts 992 to a line 112 con
The Timers
necting with a point on the line 88 on the other side of
the contacts 992. Likewise, contacts 1073 control a cir
In the embodiment shown in the accompanying draw
cuit having a line 114 leading from the line 80 and a
ing, the timers 140 and 1400 which assure the synchrony
line 115 connecting with the line 93 and forming a circuit
of movement of the slide 22 in relation to the movement
40
in paralled to the limit switch 86 and the normally open
of the plunger 18 are operated by the movement of the
relay contacts 832.
shafts ‘27 which cause reciprocation of the plunger 18
The closure of the normally open relay contacts 1072
relative to the slide 22. The timers 170 and ‘1700 which
and 1073 reestablishes a ?ow of current through the relay
allow the slide 22 to come to rest and dwell at appro
coil 87 causing closure of the relay contacts 872 and 873. 45 priate times in the movement of the plunger 18 are oper
Thus, current again ?ows through motor starter-controller
ated by the movement of one of the crank shafts 36.
52 which is then actuated to connect motors 38 and 381
to the source of power S, as transmitted therefrom by
the main lines S-l, S-2 and S-3. Activation of the motors
One timer 140 insures that the motors 38 and 381 mov
ing the slide 22 start at a time in the movement of the
plunger 18 so that in the interim between their starting
38 and 381 causes the slide 22 to move and moves the 50 and the time it takes to move the side 22 a full stroke,
plunger 18 toward a position supporting the latter for
such as one toward the bolster 17, the movement of the
reciprocation through another range of reciprocation, such
plunger 18 will, at the time the slide 22 reaches the
end of such stroke, be moving in a substantially coincid
and replacement of work between the plunger and bolster.
ing direction relative to the bolster 17 with the movement
The movement of the slide 22 continues as long as 55 of the slide 22. This is illustrated in FIG. 6 of the
as one well spaced from the bolster 17 as to allow removal
the motors 38 and 381 remain connected to the source
accompanying drawings wherein a continous sine curve
of power S. To disconnect the motors 38 and 381 and
line 182 diagrammatically illustrates the continuous move
ment of the plunger 18 relative to the bed 16 and line
thus allow the slide 22 to come to rest at some desired
222 illustrates, diagrammatically, a periodic movement
position, I provide a further limit switch 118 and a cir
cuit including a line 119 leading from the line 80, the 60 of the slide 22 relative to the bed 16.
In order to secure the composite movement of both
normally and now closed relay contacts 834, a line 120
plunger and slide toward the bed 16, which movement
and a relay coil 117 to the line 541. Relay coil 117 has
is indicated diagrammatically by line 602, shown in FIG.
normally closed relay contacts 1171 and 1172. Contacts
6, the timer ‘140 starts the motors 38 and 381 (disre
1172 are in the line 97 and form therewith a part of
the circuit of relay coil 99. Opening of contacts 1172 65 garding inertia) at a point 603 on line 182 in the move
ment of the plunger 18.
opens the circuit of the coil 99 and through its contacts
Then, the slide 22 will reach a point 604 on line 222,
the circuits of coil 107 whose contacts 1073 control coil
that is the nearest point it moves toward the bed 16, at a
87. Contacts 1171 also form a part of the circuit of
time just prior to the time the plunger 18 reaches point
the relay coil 87 so that, when the relay coil 117 is
energized, the contacts 11711 and 1172 are opened, open 70 605 on line 182. The composite movement thus pro
duced causes the slide and plunger to elfect a plunger
ing the circuit through relay coil 87. This causes the
movement in the manner diagrammatically illustrated by
then closed but normally open relay contacts 872 and
line 602 shown in FIG. 6 between points 6031, 6041 and
873 to return to their normally open relation and thereby
6051 on line 602 and which are vertically aligned and
interrupt the How of current through the motor starter/
are therefore coincident with the previously mentioned
75
controller 52. Discontinuance of current through the
points 603, 604 and 605, respectively.
3,082,725
10
The other timer, indicated at 1400, insures that the
as the hand operated worm 155 which meshes with the
motors 38 and 381 start to move the slide 22a full
gear sector portion 147. The worm 155 is journ'alled in
stroke, in the opposite direction from the direction of
straps 156 on the face 221 of the slide 21. The worm 155
is keyed to a shaft 15-7 likewise keyed to a suitable hand
wheel 158 or other shaft turning means. Hence, by turn
ing the shaft ‘157 and worm 155, the bracket 144 may
the stroke just described, only after the plunger 18 has
completed its full stroke toward the bed 16 and bolster
17 and while the plunger is beginning its immediately
subsequent retracting stroke. This also is illustrated in
be caused to rotate on its bearing portion 145 about the
shaft 27, one way or another, to locate the arm portion
FIG. 6 of the accompanying drawings. There it is
146 and switch box 148 it supports in ‘any desired ad
shown, diagrammatically, that in order to secure the
return composite movement of plunger 18 and slide 22 10 justed position in an orbit whose axis coincides with that
of the shaft 27. By thus adjusting the bracket 144, the
as shown by line 602, the timer 1400 starts the motors
38 and 381 (disregarding inertia) at a point 606 on line
222 in the movement of the slide 22. Point 606 roughly
switch operating arm 149 may be positioned to be actu
ated by the cam high point 153 at any desired point in
the rotation of the shaft 27 and thus at any desired
coincides with or is just a shade subsequent to point 605
in the plan of operation of the described embodiment. 15 point in the lineal movement of the plunger 18 recipro
cated by rotation of the shafts 27.
When so timed, the slide 22 reaches point 607 on line
With suitable adjustment, the activation of the switch
222, which is furtherest point it moves away from the
operating arm 149 and switch 86 to initiate the movement
bed 16, at a time roughtly coincident to the time the
of the slide 22 may be synchronized with the movement
plunger 18 reaches point 608 on line 182. The com
posite movement thus produced causes the slide and the 20 of the plunger 18 to produce a compound of movements
in a desired direction and order such as the one shown in
plunger to produce the return movement illustrated by
FIG. 6 of the accompanying drawings. As contemplated
the portion of line 602 of FIG. 6 between points 6061
in the presently described embodiment, the switch 86 is
and ‘6071’ and 6081 on line 602 which are vertically aligned
activated to begin the slide movement downward toward
duplicates of the heretofore mentioned points 606, Y607
and 608.
25 the bed 16 and so that in the interim of time it takes the
slide 22 to reach the lowest point of its stroke, relative
The timers 1-40 and 1400 may be structurally and, with
to the slide 22, the plunger 18 will be moving toward
in each of their individual structures, functionally iden
the bed 16.
tical. The timer 140 is operated by one and the timer
In order to disconnect the motors 38 and 381 from
1400 by the other of the shafts 27. A description of the
the source of power at a desired point in the movement
parts of the timer 140 will serve to describe the parts of
of the slide 22 following initiation of its movement by
the timer 1400, like parts in the timer 1400 bearing four
switch 86, the switch 96 is operated in the structure
place legend numerals corresponding in ending to those
shown herein by means on one of the shafts 36. The
used in describing the timer 140- parts of corresponding
particular means shown is embodied in a timer 170 shown
nature and structure; for example, a part in timer 1400
which is a counterpart to a part of timer 140 bearing 35 in FIG. 4 of the accompanying drawings. The timer 170
legend 144 will, in the description which follows, bear
includes a cam 171 mounted on one of the shafts 36
the switch box 148 will be closed, establishing circuits
dwell period. During the dwell period of the slide 22,
so as to move through a path to engage a roller 172 on
legend numeral 1404 and so on. Where differences ap
the end of a switch operating lever 173 pivotally mounted
pear, speci?c reference will be made thereto. One end
on a switch box 174 containing switch 96. The switch
271 ‘of one shaft 27 extends beyond a face 221 of the
slide 22. A bushing 143 surrounds the end 271 and sup 40 box 174 is adjustably mounted, as by suitable bolts 175
on the base 11 of the press. The cam 171 in consequence
ports a bracket 144 that has an annular bearing portion
of the rotation of the shaft 36, engages the roller 172 and
145 an arm portion 146‘ and a worm gear sector portion
moves the switch operating lever 173 to close the switch
147. The arm and gear sector portions are disposed in
96 at a time which coincides with that time at which the
approximate diametrically opposed relation to each other
cranks 35 have moved the slide 22 to one extreme of its
on the bearing portion 145.
45
movement, such as, in the structure shown, to that ex;
The arm portion 146 supports a switch box 148 enclos
treme nearest to the bed 16. Operation of the switch 96
ing one of the switches 86 and 105. Extending from
establishes circuits, previously described, which discon
and pivotally mounted on the switch box 148 is a switch
nect the motors 38 and 381 from the source of power.
operating lever 149 that has end roller 150‘. When the
lever 149 is moved in one direction the switch within 50 Thus, the slide 22 begins on operation of switch 96, a
the plunger 18 completes its movement in the direction
heretofore described. A means for moving the lever 149
toward the bed 16.
embodied in a cam member 151 that is mounted, as by
As the plunger 18 completes its movement aforesaid,
suitable bolts 152, on the end 271 of the shaft 27. The
position of the cam member 151 is such that, as the shaft 55 the switch 105 is operated. The switch 105 is operated
by the timer 1440. Timer 1400, like timer 140, has a
rotates, the cam member will rotate with the shaft and the
bracket 1440 with a bearing portion 1450 and an arm
roller 150 on the switch operating lever 149‘ will ride
portion 1460 supporting a switch box 1480 for housing
the cam surface of the cam member 151. When a high
the switch 105. The timer 1400 is preferably mounted
point 153 of the cam member 151 engages the roller 150,
on the end of the other crank shaft 27 that is a con
the lever 149 will be moved to close the switch in the
temporary to the shaft 27 on which the timer 140 is
switch box 148.
mounted. As will be noted from FIG. 1 of the ac—
Assuming that the switch box 148 contains the switch
companying drawings, the arm 1460 supports the switch
86 and that manually operated starting switches 55 and
box 1480 containing the switch 105 in a position that a
70 have been closed, momentary closure of switch 86
switch operating lever 1490 pivotally mounted on the box
within the switch box establishes circuits, causes current 65 1480 and supporting a roller 1500 may be engaged by a
to flow through coil ‘87, closing normally open contacts
cam 1510 having a high point 1530- and being mounted,
872 and 873 to activate the motor starter/controller 52.
as by bolts 1520, on the end of the other shaft 27. The
This connects the motors 38 and 381 to the source of
high point 1503 of cam 1501, it will be noted, is dia
power until switch 96 is operated. In order that the ‘ metrically opposite extending from its shaft 27 to that
switch 86 may be operated to obtain desired synchrony 70 in which the high point 153 of cam 151 extends from
between the movements of the plunger 18 and slide 22,
its shaft 27. Now, as the shafts 27 rotate to move the
the position of the arm portion 146 supporting the switch
plunger 18 through the just described closing stages of
box 148 and its switch operating lever 149 may be varied
its movement toward the bed 16', the cam high point 1503
arcuately about the axis of the shaft 27. This variation
engages the roller 1500 and through the switch operating
may be effected by some suitable adjusting means, such 75 lever 1409 causes switch 105 to close.
11
3,082,725
Closure of the switch 105 establishes circuits hereto
fore described that actuate the motor controller/starter
52 to connect motors 38 and 381 with the source of
power. The slide 22 then begins to move, in the embodi
ment shown, away from the bed 16 moving the plunger
18, whose movement at that stage is also away from the
bed.
Preferably, the movement of the slide 22 continues
until, as in the form here described, the slide reaches its
most remote position away from the bed 16. In this po
sition, the plunger 18, even though continuing to recipro
cate, will, in all of its extremes of movement, be suffi
ciently spaced from the bed 16 to allow work that may
be on the bed to be removed and new work to be placed
between the plunger and the bed for subsequent work
mg.
The slide 22 is brought to a stop at this position to
dwell until, for example, the switch 70 is again closed to
initiate a new cycle.
In order to bring the slide 22 to a
12
ported on the bolster 17, the operator closes switch 70.
Automatically at a proper time in synchrony with the
continuous reciprocation of the plunger 18, switch 86
is closed by timer 140 resulting in a compound move
ment of slide and plunger represented by the portion of
line 602 in FIG. ‘6 of the drawings extending ‘from point
6031 on line 602 to 6051 on line 602.
At this point the slide 18 and plunger 22 will be in
positions shown in FIG. 2 of the drawings. In these po
sitions, a previously placed work blank is being engaged
by the plunger 18 to be worked against bolster supported
dies.
During the course of movement to these positions and
at the point 6041 on :line 602 of FIG. 6, the timer 170
actuates switch 96 causing the slide 22 to discontinue its
movement and to dwell while the plunger 18 completes
its movement indicated by the portion of line 602 be
tween points 6041 and 6051.
As the plunger 18 completes such movement, timer
stop, the switch 118 needs to be closed. This, as in the 20 1400 actuates switch 105 causing slide 22 to discontinue
case of closing switch Q6, may be effected by the com
' its dwell and to begin to move upward and away from
panion timer 1700‘. The timer 1700, like timer 170 in
the bolster and bed. This movement of the slide and the
cludes a cam 1701 mounted on and rotating with the
coincident movement of the plunger 18 produces a com
shaft 36 on which cam 171 is mounted. The cam 1701
is positioned so that rotation of the shaft 36 moves the 25 pound movement of slide and plunger indicated diagram
matically by the portion of line 602 in FIG. 6 extending
cam 1701 in a path to engage and move a roller 1702
on the end of a switch operating lever 1703 pivotally
mounted on a switch box 1704 containing the switch 118.
The switch operating lever 1703 is operatively connected
from point 6051/6061 ‘to point 6071/6081.
This compound movement causes the return of the
slide and plunger to the mentioned starting position shown
in FIG. 1 of the drawings. Now, the worked work blank
to the movable switch member of the switch 118 so that 30
may be removed from between the bolster and plunger
when the lever is moved in one direction the switch 118
and, if ‘desired, an unworked work blank be placed in
will be closed.
position ready for work. Ample time is allowed for this
The switch box 1704 is adjustably mounted, as by bolts
removal and reloading of work blanks because as the
1705 on the press base 11. By adjusting the position of
slide 22 moved upward, the timer 1700 operates switch
the switch box 1704 on the base 11, the moment of op
118 ‘disconnecting the motors 38 and 381 driving the
eration of the switch 118 may be timed to synchronize
slide 22. Thus, the slide 22 comes to rest and begins to
with that at which the cranks 35 moving the slide 22 to
dwell at point 6071 on line 602 of FIG. 6 until the oper
complete its movement to an extreme of the slide recip
ator again closes switch 70 to initiate a new cycle.
rocation, such as in the selected press, a position further
Thus, it will be apparent that my invention teaches
est from the bed.
40 that by utilizing a pair of pressure producing parts of
As was described in connection with the circuits, clo
sure of the switch 118 establishes circuits that are opera
tive to disconnect the motors 38 and ‘381 from the source
which, at least, one is movable and having two operable
means in tandem for moving the movable pressure exert
ing part and means connecting to each said operable
of power. The slide 22 begins a dwell and continues for
such a time allowing unloading and reloading of the work 45 means for actuating one continuously and the other in
termittently in synchrony, however, with the continuous
and until switch 70 is again operated. Those skilled in
movement of the continuously moving means, a press
the art recognize that switch 70 may be operatively con
may be constructed that obviates the need for clutching
nected to and be automatically operated after a pre
or for stopping and starting and without sacri?ce of the
scribed interval by a conventional timer device or, if a
work feeder be included in the assembly, by the work 50 freedom in time in which to place a work blank for
working or to remove a work blank following working.
feeder apparatus itself, after completion of the work
I claim:
feed.
Operation
1. In a press or the like having a frame, a bed on the
frame, a slide in sliding engagement with the frame for
Those skilled in the art will appreciate that, in use,
movement between two points spaced different distances
55
the switch 55, when closed, connects the plunger operat
from the bed, movable means in movable engagement
ing motor 28 to the source of power through the medium
with the slide and the frame and adapted in moving to
of the starter/controller '51. This provides a constant
reciprocate the slide between the mentioned points, a
?ow of current to the motor 28 with the result that plung
plunger in sliding engagement with the frame for move
er 18 is driven in an uninterrupted series of reciprocations,
ment toward and away from the bed, and a second mov
such as are diagrammatically shown by line 182 in FIG. 60 able means in movable engagement with the plunger and
6 of the drawings.
the slide and adapted in moving to reciprocate the plung
This reciprocation of the plunger 18 is always with
er relative to the slide and when the slide is at the point
reference to the slide 22, however, so that when it is de
of the mentioned points nearer the bed to support the
sired to change the site of the range of reciprocation of
plunger so that at one stage of the plunger’s reciprocation
65
the plunger 18, movement of the slide 22 is required.
it engages the bed; the combination therewith of a source
When the slide 22 is at the position shown in FIG. 1 of
of power, a motor on the slide in operatively connecting
engagement with the source of power and with the second
18 is through a range that is spaced from the bolster 17
movable means and adapted to continuously operate the
and bed 16 sufficiently that the plunger 18 does not ap
second movable means to reciprocate the plunger rela
proach the bolster and bed closer than a space adequate 70 tive to the slide, a second motor on the frame and in
to enable the operator to place a work blank for work on
operatively connecting engagement with the ?rst named
the drawings, the continuous reciprocation of the plunger
the bolster. This position is called the “starting” posi
tion and the following description of operation proceeds
from that position.
movable means, and actuatable means in operatively con
necting engagement with the second motor and the source
of power and operative when actuated to connect the sec
Having placed the work blank on dies as may be sup 75 ond motor to the source of power, and a movable element
3,082,725
13
in movable engagement with the frame for actuating the
actuatable means and being in a position to be engaged
and moved by the movement of the second movable
means as the same moves the plunger and so that a con
nection of the second motor to the source of power to
actuate the ?rst named movable means to move the slide
and plunger toward the bed occurs at a time in the plunger
14
the motor means operatively connected to the slide oper
ating means being intermittently operating in synchrony
with the plunger pressing strokes to withdraw the slide
and plunger from the bed after a pressing stroke of the
plunger thus to allow work blank loading on the bed
and to advance the slide and plunger toward the bed
prior to a pressing stroke of the plunger to allow press
ing on the work blank.
8. In a pressure exerting machine having a frame, a
sive thereto the plunger in response to operation of the 10 pressure withstanding part on the frame, a plunger in
movable engagement with the frame, movable means in
second movable means moves to complete its movement
engagement with the plunger for moving the plunger, a
toward the bed at a time subsequent to the slide complet
source of power in operative connection with the movable
ing its movement toward the bed in response to operation
means for continuously moving the same to cause recip-I
‘of the ?rst named movable means.
2. In a press or the like as described in claim 1 having 15 rocation of the plunger, and a second movable means in
engagement with the frame and the ?rst named movable
in addition thereto, a second movable element in movable
means for moving the same and the plunger relative to
engagement with the frame at a position to be engaged
the pressure withstanding part and between a plurality of
‘and moved by the ?rst named movable means at a time
positions with respect thereto, one of the positions being
when the same has moved the slide to the point nearer
the bed and adapted when so moved to disconnect the 20 such that movement of the ?rst named movable means
causes plunger reciprocation through a range in which the
second motor from the source of power thereby allowing
‘plunger moving therein engages the pressure withstand
the slide to dwell.
movement ‘between the start and end of a stroke of the
plunger toward the bed and so that immediately succes
3. In a press or the like as described in claim 2 having
in addition thereto a third movable element in movable
ing part and the other of the positions being such that
movement of the ?rst named movable means causes‘
engagement with the frame at a position to be engaged 25 plunger reciprocation through a range spaced from the
?rst described range in a direction away from the pres
sure withstanding part; the combination therewith of a
moves the plunger to complete its movement toward the
transmission means in operative engagement with the
bed, the third movable element adapted when so moved
and moved by the second movable means as the same
source of power and the second movable means and in
to connect the second motor to the source of power to
actuate the ?rst named movable means to move the slide 30 cluding a movable element in movable engagement with
and plunger away from the bed only at a time in the
plunger movement that is immediately subsequent to the
time the plunger engages the bed.
4. In a press or the like as described in claim 3, having
the frame at a position to be engaged and moved by the
?rst named movable means upon movement of the
plunger through a point in one range of reciprocation and
adapted when thus moved to operatively connect the.
‘in addition thereto, a fourth movable element in movable 35 second movable means and the source of power through
the transmission means whereby the plunger ?rst named
engagement with the frame at a position to be engaged
and moved by the ?rst named movable means at a time
when the same has moved the slide to the point remote
movable means are moved from the position of the one
range of reciprocation to the position of the other range
of reciprocation in synchrony with the plunger move
‘from the bed, the fourth movable element adapted when
‘so moved to disconnect the second motor from the source 40 ment through the mentioned point in the one range of
reciprocation.
of power thereby allowing the slide to dwell.
5. In a press or the like as described in claim 4 in
which each of the severally named movable means in
cludes a cam in engagement with and adapted to be
9. In a pressure exerting machine as described in
claim 8 in which said transmission means includes a sec
ond movable element in movable engagement with the
moved by the movable means and each of the severally 45 frame at a position to be engaged and moved by the
second named movable means upon a predetermined
named movable elements comprises a movable switch
movement of the plunger and ?rst named movable means
part connected with the source of power and in a posi
from the position of the one range of reciprocation to
tion to be engaged and moved by one of said cams and
the position of the other range of reciprocation to dis
there being, in addition, means connected to each switch
and to the second motor for rendering each switch opera 50 connect the source of power from the second named mov
able means whereby the second movable means dwells in
tive in sequence when moved to connect and disconnect
the position of the other range of reciprocation.
the second motor to and from the source of power.
10. In a pressure exerting machine as described in
6. In a press of the like as described in claim 5 having
claim 8 in which the movable element is in movable en
in addition thereto a manually operable part in operative
connection with the source of power and the last named 55 gagement with the frame at a position to be engaged and
moved by the ?rst named movable means upon move—
means operable to render the last named means operative.
ment of the plunger through a point in the ?rst describedt
7. A press or the like having a frame, a bed on the
range of reciprocation to operatively connect the sec-v
frame, a slide in sliding engagement with the frame,
ond movable means and the source of power to move the
slide operating means operatively connected to the slide
and to the frame and adapted on actuation to move the 60 plunger and ?rst named movable means from a position
in the ?rst described range of reciprocation to a position
slide between two points on the frame spaced di?erent dis
in the second described range of reciprocation.
tances from the bed, a plunger in sliding engagement with
11. In a pressure exerting machine as described in;
the frame, plunger operating means operatively connected
claim 8 in which the movable element is in movable en
to the plunger and to the slide and adapted when ac
gagement with the frame at a position to be engaged and
tuated to reciprocate the plunger relative to the slide and
moved by the ?rst named movable means upon move
at one stage of the plunger reciprocation while the slide
ment of the plunger through a point in the second de
is at one of the points to support the plunger for engag
scribed range of'reciprocation to operatively connect the
ing the bed and while the slide is at the other point to
second movable means and the source of power to move
support the plunger for reciprocation at all stages thereof
spaced from the bed, and motor means independent to 70 the plunger and ?rst named movable means from a po
sition in the second described range of reciprocation to
and operatively connected to each of the slide and
a position in the ?rst described range of reciprocation.
plunger operating means for actuating the same, the mo
12. In a pressure exerting machine as described in
tor means operatively connected to the plunger operating
claim 11 having in addition a second movable element
means being continuously operating and capable of ac
complishing power pressing strokes of the plunger, and 75 in movable engagement with the frame at a position to
3,082,725
15
i6
be engaged and moved by the ?rst named movable
means upon movement of the plunger through a point in
atively connected to the ?rst named operable means to
thereby periodically reciprocate the slide and to alter
the ?rst described rangeof reciprocation to operatively
connect the second movable means and the source of
power to move the plunger and the ?rst named movable O1
means from a position in the ?rst described range of re
ciprocation to a position in the second described range
of reciprocation.
13. In a pressure exerting machine having a frame,
a pressure withstanding part on the frame, a slide in mov
able engagement with the frame, operable means in mov
able engagement with the frame and the slide and
nately bring the plunger to a range of reciprocation to
engage the pressure withstanding part and thereafter to
a range of reciprocation spaced from the pressure with
standing part and in which the plunger is at all times
and in every stage of its reciprocation on the slide side
of the pressure withstanding part and the pressure with
standing part side of the slide.
10
adapted when operated to reciprocate the slide toward
and away from the pressure withstanding part, a plunger
in movable engagement with the frame, a second oper
able means, connecting means separate from and inde
pendent of the ?rst mentioned operable means and in
engagement with the slide and the second operable
means for operatively connecting the second operable
means to the slide and moving the second operable
means with the slide, a second connecting means sepa
rate from and independent of the ?rst mentioned oper
able means and in engagement with the plunger and the
second operable means for operatively connecting the
second operable means to the plunger whereby the
plunger is adapted when the second operable means is
operated to reciprocate relative to the slide and toward
and away from the pressure withstanding part, a con
tinuously acting source of power operatively connected to
the mentioned second operable means to thereby unin
15. A sheet metal press having a frame, a bed on the
frame, a slide in slidable engagement with the frame
and being reciprocably movable thereon relative to the
bed, intermittently actuated power means on the frame
including a part in engagement with the slide and opera
tive when actuated to move the slide relative to the bed,
a plunger in slidable engagement with the frame on the
bed side of the slide and being reciprocably movable
relative to the bed and slide, a continuously actuated
power means on the slide including a movable part in
engagement with the plunger connecting the plunger with
the slide and producing continuous movement thereof
relative to the slide, and timing means operatively con
nected to both power means and adapted to limit the
actuation of the ?rst named power means to move the
slide and plunger in one direction relative to the bed to
a time so that the movement of the slide in said direc
tion and in response to said actuation of the ?rst named
power means is completed just prior to the close of the
movement of the plunger in the same direction relative
to the bed in response to the actuation of the second
terruptedly reciprocate the plunger, an intermittent acting
named power means.
source of power operatively connected to the ?rst named
16. A sheet metal press having a frame, a bed on the
frame, a slide in slidable engagement with the frame and
operable means to thereby periodically reciprocate the
slide and to alternately bring the plunger to a range of
reciprocation to engage the pressure withstanding part
and thereafter to a range of reciprocation spaced from
the pressure withstanding part.
being reciprocably movable thereon relative to the bed,
intermittently actuated power means on the frame in
cluding a part in engagement with the slide and operative
‘when actuated to move the slide relative to the bed, a
plunger in slidable engagement with the frame on the bed
14. In a pressure exerting machine having a frame, a
pressure withstanding part on the frame, a slide-in mov
side of the slide and being reciprocably movable relative
able engagement with the frame, operable means in mov 40
to
the bed and slide, a continuously actuated power
able engagement with the frame and the slide and
means on the slide including a movable part in engage
adapted when operated to reciprocate the slide toward
ment with the plunger connecting the plunger with the
and away from the pressure withstanding part, a plunger
slide and producing continuous movement thereof rela
in movable engagement with the frame, a second oper
tive to the slide, and a timing means in operative con
able means, connecting means separate from and inde
nection with each power means to energize the same in
pendent of the ?rst mentioned operable means and in en
predetermined synchronism with each other and accord
gagement with the slide and the second operable means
for operatively connecting the second operable means to
the slide and moving the second operable means with
the slide, a second connecting means separate from and
independent of the ?rst named operable means and in
engagement with the plunger and the second operable
means for operatively connecting the second operable
means to the plunger whereby the plunger is adapted
when the second operable means is operated to recipro
cate relative to the slide and toward and away from the
pressure withstanding part, a continuously acting source
of power operatively connected to the mentioned second
- operable means to thereby uninterruptediy reciprocate
the plunger, an intermittent acting source of power oper 60
ing to the relative movements of the slide and plunger,
the timing means including actuating elements in adjust
able engagement with the press frame and adapted when
adjusted to actuate each timing means to energize each
power means in any predetermined synchronism and ac
cording to any relative movements of the slide and
plunger.
References (Iitcd in the ?le of this patent
UNITED STATES PATENTS
1,753,695
2,688,296
Dobson ______________ __ Apr. 8, 1930
Danly _______________ __ Sept. 7, 1954
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