US2101021A - Pressing machine and control mechanism - Google Patents

Description

Dec. 7, 1937. J. P. DALY PRESSING MACHINE AND CONTROL MECHANISM Filed Oct. 6, 1934 4 Sheets-Shet 1 mvzm'ok P. DA LY JOSEPH I i BY 4 1101111126 Dec. 7,1937. J P, Y 2,101,021

PRESSING MACHINE AND CONTROL MECHANISM Filed Oct. 6, 1934 4 Sheets-Sheet 2 INVENfOR JOSEPH R DALY I De; 7,1937.

J. P. DAILY 2,101,021

PRESSING MACHINE AND CONTROL MECHANISM Filed Oct. 6, 1934 4 Shee ts-Sheet s JOSEPH P. DALY AITORNEYJ Dec. 7, 1937.

J. P. DALY PRESING MACHINE AND CONTROL MECHANISM 4 Shts-Sheet 4 A Filed Oct. 6, 1934 FlG.-4

INVENTOI? JOSEPH P. DALY ATTC%- Patented Dec. 7, 1937 UNITED STATES PRESSING MACHINE" AND CONTRO MECHANISM 1 Joseph P. Daly, New York, N. Y., assignor to The American Laundry Machinery Company, Norwood, Ohio, a corporation of Ohio Application October 6, 1934, Serial No. 747,173

22 Claims.

This invention relates to pressing machines such as are used for laundry or garment pressing 'workn The invention has relation both to the operating means and mechanism forproducing 5 relative-motion of the pressing members and to the control means for the power mechanism used for operating the press.

The invention has more particular relation to that type of press in which the pressing members are relatively movable toward and from each other both to preliminarily close them upon the Work and to produce final 'or heavy pressure for the pressing operation, either or both of the preliminary closing and final pressure movements being produced by power means, andmore particularly to such a press in which the power transmitting mechanism for operating the pressing members includes separable parts adapted to be coupled or uncoupled, and which transmit the power effect of the motor to the pressing members only when they are coupled.

One object of the invention is to provide a press of this kind which includes two hand control means which compels the operator to keep 2., both of his hands busy inorder to bring the parts to that position .in which the pressing members are preliminarily closed and the separable parts are coupled to establish power transmitting relation between the motor means and the pressing members in order to instigate the final pressure effect, thus safeguarding the operator against injury. 1

Another object of the invention is to provide a press of this kind including two distinct motor means, one of which operates to couple the -sep' arable parts and the other of which operates the pressing members for the production of final heavy pressure, together with two hand control means for one or both of said motor means with 41) its consequent safeguardingeffect.

Another object of the invention is to provide a press-of the kind in which one motor means is utilized both for preliminarily closing thepress and for coupling the separable parts, and a second motor means is utilized for producing final heavy pressure for the pressing operation, the press preferably also including safeguarding two hand control means.

. A further object of the invention is to provide one of which produces preliminary press closing movement or part thereof, and the other of which is arranged to produce final heavy pressure, one of said motor means being also arranged to function as a transmitter of pressure to the other or a press including two fluid pressure-motor means,

as a pump to produce pressure for operating the other, with consequent interconnection and the ability to control both of the motors by one set of control devices.

A further object of the invention is to provide a press of this kind including two fluid pressure motors, one of which first operates as a pump to supply pressure for the other and second, as a motor means to transmit power effect directly to the pressing members. H

Another'object of my inven on is'to provide a press of the class described including cooperating pressing members, means for causing pressure therebetween including a fluid actuatedmotor,'*

parts normally ineffective to transmit motion until the press is preliminarily closed,,means for preliminarily closing the press and coupling said parts'in effective position, and means preventing the machine going into final pressure, even though the press has reached its preliminarily closed position, until after the operator releases a control member for the motor.

Other objects and advantages will be appar-'. ent to those skilled inthe art and include the novel mechanisms and devices described inthe accompanying specification and-disclosed in the drawings. 7 1

In the drawings, Figll is a view of a press embodying my invention with the pressing mern'' bers in open position and with certain of the parts broken away to more clearly disclose the structure; Fig. 2 isa view similar to Fig. 1, with the pressing members in closed position and with certain structural portions in section; Fig. 3 is a diagrammatic layout of a control mechanism for my press; Figs. 4 and 5illustrate a modification of a portion of the mechanism illustrated in Figs. 1, 2, and 3, in Fig. 4 the parts are .in pressopen position and in Fig. 5 they are in pressclosed position; Fig. 6 is a sectional view along line 6-6 of Fig. 5; while Fig. 7 is a sectional view along the line 1--'| of Fig. 6. 5

The embodiment of myinventive concept disclosedin Figs. 1 to 3..comprises a stationarypressing bed member l0 mounted on a suitable frame II, and a cooperating pressing head member l2 carried by a head lever l3 which is pivotally mounted at H on the frame. Mechanism for closing the press comprises a cylinder and piston motor l5 yieldingly mounted on the frame at I6, as will be hereinafter more particularly described, and provided wltha piston l1 and a piston rod I8 pivotally connected at Is to a power lever 20 which in turn is pivotally mounted at 2| on the frame II. The connection, between the power lever and the head lever for moving the latter into final pressing position includes a strut 22 pivotally connected to the head lever at 23 and normally in uncoupled or ineffective position as indicated in Fig. 1. Motion transmitting mechanism connected between the motor l5 and head lever l3 for preliminarily closing the press includes a fluid actuated motor.24 which also actuates a bellcrank 25 which moves strut 22 to coupled or effective positionas seen in Fig. 2, when the press is preliminarily-closed. These parts will now be described in greater detail.

A lost motion connection is provided between piston l1 and its-piston rod l8, and the motion of the pistonduring the first portion of its stroke is utilized ,to cause preliminary closing of the press. This lost motion connection comprises a piston rod member l8 which is adapted to telescope within the rod l8 and is 'slidably secured therein by means of a stud 25 threaded in the rod l8 and extending intoa slot 21 in the rod member l8. rod portions l8 and I8 in their extended position. The piston rod 8 is provided with the. usual packing gland 28 and thepiston I1 is provided with oppositely facing cups 30 so that it may work against a pressure fluid on either face.

The fluid motor 24 has a piston 3| connected by a rod 32 with the head lever at 33. It is desirable that the motor 24 act upon the head |2 with less power than the motor IS. TO this end, the cylinder of motor 24 is made of less diameter than the cylinder of motor [5, and the rod 32 is pivoted to the head lever with less of a lever arm than the strut 22. The upper end of the press closing cylinder 3|' is provided with a vent 34. The lower end of cylinder 3|.is pivotally mounted at 35 on one arm of the bellcrank 25, which in turn. is pivotally mounted at 36 on the power lever 26. The other arm of b ellcrank 25 carries members 31 and 38 which lie on opposite sides of strut 22 for the purpose of moving the strut about its pivot 23 as the bellcrank oscillates'about its pivot 36. The lower end of cylinder 3| is connected by conduit 39 with the lower end of cylinder l1 so that fluid compressed upon movement of piston |1 downwardlyin its cylinder will be conducted to the lower face of piston 3|. The lower end of cylinder 3| is also in communication with a, normally closed exhaust valve 40 operable by its valve stem 4| in a, manner hereinafter described. A spring 42 is connected between the rear end ofthe head lever and bellcrank 25 and normally tends to hold the head in open'position and tobias the bellcrank 25 at the counterclockwiselimit of its oscillation, as: viewed in Figs. 1 and 2. This counterclockwise movement is adjustably limited by a screw 43 which contacts a A spring 28 biases the piston a the end of the strut rests upon a hardened bearing block 50 which forms a part of the power lever. A spring-pressed buifer member 5| is secured to the lower end of, the strut for the purpose of quietly guiding the strut into its effective position.

Operator operated means is provided for controlling the flow of pressure fluid from a source 52 to motor l5. In the form disclosed this comprises a pair of combined inlet and outlet valve casings 53 and 54 connected in series. Each of these casings encloses a normally closed inlet valve 55, 55' and a normally open exhaust valve 56, 56' mounted on .a common stem 51, 51' for operation by a manual 58 and 58'. Conduit 59 connects valve casing 53 with the supply conduit. Conduit 68 connects valve casings 53 and 54, and conduit 6| connects valve casing 54with 'valve casing 62 which in turn is connected with the upper end of cylinder I1 by means of conduit 63. Connected with valve casing 53, or mounted separately if desired, is a normally closed pressure release valve 64 in a casing 65 connected by conduit 66 with conduit 63, this release valve being operable by valve stem 61 and manual 68.

The function of the mechanism in casing 62 is to bypass the manuals 58 and 58' and connect .the cylinder I1 directly with the source of fluid supply upon the development of a predetermined pressure between the pressing members. The casing contains a normally open inlet valve 68 biased in that direction by spring 10, and a normally closed inlet valvell biased in that direction by spring 12. It will be noted that conduit 63 enters casing 62 intermediate these two valves, that spring 12 is heavierthan spring 10, and that the-upper surface 'of the .valve disk of valve 1| presents a greater area than the lower surface thereof, as viewed in Fig. 3. As aresult of this structure, pressure supplied through conduit 6| is suflicient to retain valve 1| closed until it is opened-by mechanism about to be-described. Cylinder l1 is-pivotallymounted at IS on an arm 13, which is pivotally connected at 14 to a bracket 15 which forms part of a base plate connected with the frame. Arm 13 is biased away from the base plate by a spring 16 which is so calculated that is is compressed under a load slightly less than the pressure exerted by the motive fluid in cylinder I1 upon the effective area'of the upper-end thereof. The movement of arm 13 toward the base plate is limited by a stop member.11.. Arm 13 carries a projection.

18 which. contacts 'the stem of valve 1| and is adapted to open'the valve when spring 16 is compressed.

The operation of the mechanism thus far described is as follows: With the parts in the position of Figs. 1 and 3, the operator arranges the lay of the'work upon the bed l0 and actuates the manuals 58 and 58'. It will be 'noted that this is a well known structure which requires the use of both hands to supply effective pressure fluid through conduit 6|, open valve 69 and conduit 63 to the upper face of piston I1. Piston ll moves downwardly in its cylinder; meanwhile the pressure in the'upper end of the cylinder remains at a low figure as long as the piston moves easily. Air compressed in the lower portion of cylinder H by the advancing piston travels through conduit 39 to cylinder 3| where it is effective against the lower face of piston 3| to cause upward travel thereof and a corresponding movement of head I2 toward a preliminarily closed position. When the head reaches safe closed position in contact with the bed (or'when the head meets' sufiicient obstruction anywhere in its downward course, as hereinafter discussed) the parts are so constructed and arranged that piston I1 is somewhat short of contact with the upper end of rod l8. At this time, the pressure against the lower face of piston H has built up to substantially line pressure due to the obstruction which prevents further movement of piston 3|. Concurrently, the pressure on the upper face of piston H has built up to an equal degree and since further movement of piston H is prevented by the fluid trapped therebeneath, cylinder II will move upwardly sufficient to compress spring 16, whereupon projection 18 opens valve H and simultaneously closes valve 69. This establishes the bypass around the manually operated valves in casings 53 and 54 so that the upper portion,

of cylinder I1 is in direct communication with a source of pressure fluid. However, nothing further will happen unless strut 22 has been moved to its effective position, as shown in Fig.2, by oscillation of bellcrank 25 in a clockwise direction about its pivot. It will be obvious that when pressure fluid is supplied to cylinder 3|, piston 3| moves up as already described, but at the same time, cylinder 3| moves downwardly to oscillate the bellcrank. Member 31 on the bellcrank exerts a yielding pressure tending to move strut 22 counterclockwise as viewed in Figs. 1 and 2, and when the strut snaps into its effective position, as shown in Fig. 2, a shoulder 19 on bellcrank 25 contacts the stem 4|, thus opening valve 40. This action alone produces no immediate results (except as hereinafter describedr because the exhaust through valve 40 is pre-v vented by a check valve 80, not previously de-. scribed, which communicates by conduit 8| with conduit GI and valve casing 54. If the operator is maintaining manual 58' in its operative posi f tion 50 as to hold exhaust valve 56' closed, at

t the time strut 22 reaches effective position and valve 40 is operated, nothing will happen because the pressure on opposite sides of valve will be substantially equal and spring 82 will serve to. maintain the valve closed.v If, however, manual.

58' is released, fiuid in conduit 8| will be ex hausted through valve 56', check valve 80 will open, pressure will be relieved in the lower portion ofv cylinder 3| and in conduit 39, and on continue its downward travel, thus contacting piston rod |8 so as to apply power to lever 28, strut 22 and head lever l3, so as to close the press under final pressure. When the pressing operation is completed, the operator'will actuate manual 68 which will permit fluid to exhaustfrom above piston IT through conduit 66 and valve 64. Springs 42, 44 and 16 will then'return the parts to press open position.

The parts are so designed that spring 16 is compressed and strut 22 reaches effective position before piston contacts rod l8. However, a certain amount of adjustment is necessary in the fielddue tocompression of padding on the pressing members, wear of the parts, etc., so that further adjustment of this point of contact is provided by the member 45 which limits the position of the upper end of rod l8, as biased by spring, when thepress is in open position.

An examination of the drawings'willshow that .In the modification shown in Figs. Ito 7.1 utilize the same press, structure and control mechanism already described, modifying, only the connection between the power leverand the head lever andthe position of the auxiliary motor. This modified structure comprises a strut 22a which is adapted to extend downward through the bifurcated end 41 of'power lever 20 when the press is in open position as' shown in Fig. 4. jThe motor 24a performs a function similar to the motor 24 already described, that is to say, the'piston rod 32a is connected'by a bracket 83. with, the strut 22a, and, the cylinder 3l'a is pivotally connected at 84 with one arm of a bellcrank member 85, the other arm of which carries a bearing block'86 which is adapted upon-proper] bellcrank oscillation to move between the lower end of strut 22a and the bifurcated end "of the.

power lever to thereby form an effective-motion transmitting mechanism between the power lever. Bellcrank 85 is pivotally mounted on pins 81 which are reciprocatinglyand the head lever.

mounted .by bars 88 in a bracket 89 which is pivotally mounted to swing about the point 2|. Barsv88 are yieldingly hel'cl inbracket 89 so as to permit a slight movement of pin 81 and bellcrank 85 when pressure is applied by power lever 28 through the strut 22a. The cylinder of motor 24a is connected by a conduit 39a with the main powercylinder in the manner described in Figs l to 3. The cylinder of motor 2411 also communicates by conduit 9|] with a. normally closed exhaust valve 40am all respects similarto valve 40 and operable by its stem Ma which contacts with a portion of bellcrank 85 when the parts reach effective position to accomplish the same purpose as similar mechanism described in Figs,

1 tov3.

It is thought unnecessary to describe the operation of the modification of Figs. .4; to? in detail as itis' in all respects analogous to that. already described. The first portion of I the power stroke of the main piston forces fluid under pressure into motor 24a, causingthepiston thereof to move upward which moves the head lever toward closed position, and simultaneously causingfthe cylinder thereof to move downward which moves pressure block 86 into. effectivepo:

sition as soon as strut 22a permits suchmove ment. With the parts inthe position of- Fig. 5,

valve 40a is opened which, when check, valve 83' opens upon release of a manual as alreadydescribed, relieves the trapped fluid beneaththe main piston, 'andthis permitssufiicient .rnove-.

ment of the mainvpiston to actuate the power lever so as to act upon strut 22a to close the press under final pressure. ,1 y

What I claim is:

1. A. pressing machine comprising cooperating relatively movable pressing members, a fluid actuated cylinder and piston motor for producing such movement, motion transmitting mechanism'eflective during the latter part of the piston stroke for applying final pressure between said members and including separable parts efiective to transmit motion only when the pressing members are in close proximity, power transmitting mechanism operatively connectedwith said piston for producing relative motion between said pressing members and eifective during the first part of the piston stroke to move said members to close proximity and to couple said parts in eilfective position, and operator controlled means for actuating said motor. I

2. A pressing machine comprising cooperating relatively movable pressing members, a cylinder and piston motor for producing said relative movement, motion transmitting mechanism effective during the latter part of the piston stroke for applying final pressure between said members and including separable parts effective to transmit motion only when the pressing members are in close proximity, power transmitting mechanism operatively connected with said piston during the first part of its stroke for relatively moving the members to close proximity and for mov ing said parts to effective position, operator controlled means for actuating said motor, and means for preventing the latter portion of said piston stroke until said parts are ineffective position.

3. A pressing machine comprising a pair of cooperating relatively movable pressing members, a cylinder and piston motor for causing said relative movement, the piston'of said motorhaving power transmitting mechanism operatively connected therewith for producing relative movement between said pressing members and effective during the first part of said piston stroke to preliminarily close the press, motion transmitting mechanism having an operative connection with said piston for causing relative movement of said pressing members into final pressure position, there being a lost motion connection between said piston and said, last named mechanism, said last-named mechanism having parts ineffective to transmit motion in press open position, and means operated by said power transmitting mechanism for making said parts effective to transmit motion.

4. In a press of the class described, cooperating relatively movable pressing members and operating mechanism therefor comprising av cylinder and piston motor having operative connec-,

tions with one of said members for causing final pressure between said members, a second cylinder and piston motor constructed and arranged to cause relative approach between said members with lower power than said firstmotor, means for compressing a fluid by operation of said first motor, and means for supplying said compressed fluid to said second motor.

5. In a press of the class described, cooperating. relatively movable pressing members and meansfor causing pressure therebetween including a fluid actuated motor, operator operated means for controlling the supply of pressure fluid to the motor, said motor being arranged for a shifting movement responsive to predetermined resistance to relative'movementof said pressing members, and means actuated by said motor shifting movement for connecting said motor directly to a source of motive fluid. V

6. In a press of the class described, cooperating relatively movable pressing members, a fluid actuated cylinder and piston motor, there being a lost motion connection between the piston and piston rod of said motor, motion transmitting mechanism between said rod and one of said pressing members for applying final pressure thereto, a second fluid operated motor having operative connections for preliminarily closing said press, and means for supplying to said second motor fluid compressed by movement of said piston in said first motor while taking up said lost motion connection.

7. A pressing machine comprising cooperating relatively movable pressing members, a fluid actuated cylinder and piston motor having a lost motion connection between its piston andpiston rod, motion transmitting mechanism between said rod-and one of said pressing members for applying final pressure thereto including separable parts adapted to be coupled and uncouparts, a second fluid actuated motor for preliminarily closing said press and coupling said parts, means for supplying to said second motor fluid compressed by movement of said piston in said first motor while taking up said lost motion connection, said compressed fluid being trapped in said motors when said press is preliminarily closed to arrest the movement of said piston of said first motor short of eflective contact with its piston rod, and means for releasing said trapped fluid when said parts are coupled.

8. A pressing machine comprising cooperating relatively movable pressing members, a cylinder and piston motor for producing said relative movement, motion transmitting mechanism effective during the latter part of the piston stroke for applying final pressure between said-members and including separable parts effective to transmit motion only when the pressing members are in' close proximity, power transmitting mechanism operatively connected with said piston during the first part of its stroke for relatively moving the members to close proximity and for moving said parts to eflective position, operator controlled means for actuating said motor, and means for normally preventing the latter portion of said piston stroke and including a device actuated to piston actuating position by said parts upon reaching effective position and a manual controlled by the operator, whereby upon said parts reaching effective position and upon operation of said manual final pressure is produced. I 9. A pressing machine comprising coacting relatively movable pressing members, fluid actuated power means for relatively moving said members to close the press, said power means including a cylinder and piston motor, said piston having an operative connection with one of said pressing membera said cylinder having a support providing a lost motion connection, manually operated means for supplying motive fluid to the working face of said piston, means actuated by the taking up of said lost motion connection for supplying motive fluid to the working face of said piston independently of said manually operated means, said power means being arranged to trap fluid in said motor in advance of said piston whereby said piston is held and said cylinder takes up said lost motion connection, and means actuated upon release of said manually operated means for exhausting said trapped fluid. v

10. A pressing machine comprising a frame, a pressing bed on said frame, a head lever pivends, a pressing head on one end of said lever and movable'therebyinto and out of engagement with said bed, a pry bar pivotally mounted on said frame, a motor for actuating said bar, a pressure strut pivotal'ly carried by the other end of said head lever and movable into and out of power transmitting relation with said pry bar, a pivoted bell-crank having one arm operatively connected with said strut, a second motor having cylinder and piston elements, one of said elements being connected with said head lever to move it in press-closing direction, the other of said elements being connected with the other arm of said bell-crank for moving the same to actuate said strut into power transmitting position, and means for operating said motors. 7

11. A pressing machine comprising a frame, a pressing bed on said frame, a head lever pivotally mounted on said frame intermediate its ends, a pressing head on one end of said lever and movable thereby into and out of engagement with said bed, a pry bar pivotally mounted on said frame, a motor for actuating said bar, a pressure strut pivotally carried by the other end of said head lever and movable into and out of power transmitting relation with said pry'bar, the end of said strut in power transmitting position lying over an opening in said bar, a pivoted bell-crank having one arm arranged to position a bridging abutment over said opening, a second motor having cylinder and piston elements, one of said elements being connected with said head lever to move it in press-closing direction, the other oi said elements being connected with the other arm of said bell-crank for moving the same to actuate said abutment into bridging position, and means for operating said motors.

12. A pressing machine comprising coacting relatively movable pressing members, fluid actuated power means for relatively moving said members to close the press, said power means including a fluid motor having cylinder and piston elements, one of said elements having an operative jconnection with one of said pressing members, the other of said elements having a support providing a lost motion connection, said power means being arranged to trap fluid in said motor in advance of the movable element thereof whereby said movable elementis held and said other element takes up said lost motion connection, manually operated means for supplying motive fluid to said motor, means actuated by the taking up of said lost motion connection for supplying motive fluid to said motor independently of said manually operated means, and

' means for releasing said trapped fluid.

13. A pressing machine comprising cooperating pressing members relatively movable to preliminary closed position and to final pressing position, power means for relatively moving said members including fluid compressing means and a motor for causing relative approach movement between said members to preliminary closed position, two-hand control means for said compressing means, means for supplying said compressed fluid to the preliminary closing motor, and means for causing further actuation of said power means to cause final pressure between said pressing members.

14. A pressing machine comprising cooperating relatively movable pressing members, a motor and connected power transmitting mechanism for relatively moving said members to apply final pressure between them, said mechanism includ ing separable parts adapted to be coupled when said pressing members are in safe-closed position, means normal y tending to uncouple said parts, a motor for coupling said. parts, two-hand control means for said coupling motor, said final pressure .motor having an energizing c rcuit and a control member therefor: arid actuating means for said control member including a part'offsaid two-hand control means and apartoperated by placing of said pressing members in sale-closed position.

15. A pressing machine comprising cooperating pressing members relatively movable to preliminarily closed position and to final pressing position, a motor and connected power transmitting mechanism for relatively moving said members to apply final pressure between them, said mechanism including separable parts adapted to be coupled and uncoupled, one of said parts being carried'by a movable pressing member to coupling position only when the press is in preliminarily closed position, meansnormally tending to uncouple said parts, a motor for coupling said parts, two-hand control means for said coupling motor, said final pressure motor having an energizing circuit and a control member therefor, and actuating means for said control member including apart operated by placing said members in preliminarily closed position.

16. A pi'essingmachine comprising cooperating pressing members relatively movable to preliminarily closed position and to final pressing position, a motor and connected power transmitting mechanism for relatively moving said members to apply final pressure between them, said mechanism including separable parts adapted to be coupled and uncoupled, means normally tending to uncouple said parts, motor means for preliminarily closing said pressing members and for coupling said parts, two-hand control means for said coupling motor, said final pressure motor having an energizing circuit and ya. control member therefor, and actuating means for said control member including a part of said two-hand control means and a part operated by movement of said separable parts to coupled position.

17 A pressing machine comprising cooperating inarily closed position and to final pressing position, a motor and connected power transmitting mechanism for relatively moving said members to apply final pressure between them, said mechanism including separable parts adapted to be coupled and uncoupled, one of said parts being movable to coupling position only when the press is in preliminarily closedv position, means normally tending to uncouple said parts, a motor for coupling said parts, two-hand control means for said coupling motor, said final pressure motor having an energizing circuit and a control member therefor, and actuating means for said control member including a part of said two-hand control means and a part controlled by movement of said parts to coupled position.

18. In a press of the class described, cooperating relatively movable pressing members, fluid actuated power means for closing said press, means normally tending to open the press, operator controlled means for supplying pressure fluid to said power means, means for establishing a direct connection between a source of fluid supply and said power means including a shiftable part.v normally in fluid cut-off position, means pressing members relatively movable to prelimtion thereof, means for shifting said shlftable part when said trapped fluid attains a. predetermined pressure, and means for releasing said retard said closing operation, mechanism con.-

trolled by the pressure of said trapped fluid for byp ssing the operator operated means and for connecting said motor directly to a source of motive fluid, and means for releasing said trapped 20. A pressing machine comprising cooperating pressing members relatively movable to preliminary closed' position and to final pressing position, a cylinder and piston motor, means operated by the first portion of said motor stroke for causing movement of said members into preliminary closed position, means operated by the latter portion of said motor stroke for causing movement of said members into final closed positlon, said motor being constructed and arranged to compress fluid ahead of said moving piston by the said first portion of said motor stroke to prevent said latter portion of said stroke, and

of its stroke.

means for releasing said compressed fluid including a part actuated by movement of said members into preliminary closed position, whereby said motor may then continue through the latter portion of itsstroke.

21. A pressing machine comprising cooperating pressing members relatively movable to preliminary closed position and to final pressing position, a cylinder and piston motor, means operated by the first portion of said motor stroke for causing movement of said members into preliminary closed position, means operated by the latter portion of said motor stroke for causing movement of said members into final 'closed position, means controlled by said first portion of said motor stroke for retarding motor operation at the end of said first portion of said stroke, and means for releasing said retarding means including a part actuated by movement of said members into preliminary closed position, whereby said motor may then continue through the latter portion of its stroke unretarded.

22. A pressing machine as in claim 21 including a'twmhand safety controlled motive fluid supply for said motor, and a fluid supply for said motor independent of said first-named supply, and means for establishing said latter supply by operation of said motor through the first portion JOSEPH P. DALY.

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