US2561766A - Hydraulic press - Google Patents

Hydraulic press Download PDF

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Publication number
US2561766A
US2561766A US60073645A US2561766A US 2561766 A US2561766 A US 2561766A US 60073645 A US60073645 A US 60073645A US 2561766 A US2561766 A US 2561766A
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Prior art keywords
ram
table
motor
position
fluid
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Cecil E Adams
Howard V Mills
Victor V Blasutta
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Denison Engineering Co
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Denison Engineering Co
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B15/00Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16Control arrangements for fluid-driven presses
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B15/00Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0023Drive arrangements for movable carriers, e.g. turntables
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/14Rotary member or shaft indexing, e.g., tool or work turret
    • Y10T74/1418Preselected indexed position
    • Y10T74/1424Sequential
    • Y10T74/1441Geneva or mutilated gear drive
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/444Tool engages work during dwell of intermittent workfeed
    • Y10T83/4607With rotary work-carrier

Description

y 24, 1951 c. E. ADAMS ETAL 2,561,766

HYDRAULIC PRESS Filed June 21, 1945 5 Sheets-Sheet 1 (I as INVENTOR.

CECIL E. ADAMS HOWARD V. MILLS BY VICTOR v. BLASUTTA y 24, 1951 c. E. ADAMS ETAL 2,561,766

HYDRAULIC PRESS Filed June 21, 1945 Sheets-Sheet 2 I: P Q g 41 "82 150 [L] 32\ 70 64 :T & 9 TANK 4 I72. 48 1 59 l 31 81 I 10 O 51 W -43; 3; f 6 33 6 g 55 1 A g l 58 1 9O 1 c 92 5 2 pm 6- I 29 i l I I 66 I LJ I 22 l I at) l I 20 IN V EN TOR.

H1101: N Eva y 1951 c. E. ADAMS EI'AL 2,561,766

HYDRAULIC PRESS Fil ed June 21, 1945 I 5 Sheets-Sheet 5 uvmvrox. CECIL E. ADAMS HOWARD v. MILLS BY VICTOR v. BLASUTTA 15M lbw 4017 /zmm HTTORNEJ-S July 24, 1951 c. E. ADAMS ETAL HYDRAULIC PRESS 5 Sheets-Sheet 5 Filed June 21, 1945 INVENTOR.

CECIL E. ADAMS HOWARD \l. MlLLS BY VICTOR v BLASUTTA HTToRusus Patented July 24, 1951 HYDRAULIC PRESS Cecil E. Adams, Howard V. Mills, and Victor V. Blasutta, Columbus, Ohio, assignors to The Denison Engineering Company, Columbus, Ohio, a corporation of Ohio Application June 21, 1945, Serial No. 600,736 11 Claims." (01. 164-95) This invention relates to improvements in hydraulic presses, more particularly presses embodying controls which are caused to take effect between reciprocations of the press ram, and which have to do especially with operations that are related in some way to the operations of the press.

One of the objects of the invention is the provision of control mechanism for a fluid motor wherein the initiation of a motor reciprocation after the completion of a cycle is effected by pressure fluid directed into the control mechanism from a conductor other than the usual conductor from the pump supplying pressure fluid to the motor.

Another object is the provision of means interlocked with the reciprocatlons of a ram for moving a work table between successive reciprocations oi the ram.

Alurther object is the provision oi valve means actuated in timed relation with work table movements ior effecting operation of the motor control mechanism lay pressure fluid.

Another object is the provision of means in press of the character stated for preventing si multaneous rem movement and table movement in either .direction of rotation of the latter.

Still another object is the provision in a ma chine oi the character stated of novel and uselul work table structural features.

Other objects and features of novelty will appear as we proceed with the description of that embodiment of the invention which, for the purposes of the present application, we have illustrated in the accompanying drawings, in which Fig. l is a side elevational view of a hydraulic press and rotary work table embodying the invention.

Fig. 2 is a front elevational view of the same.

Fig. 3 is a diagrammatic view illustrating certain features of our invention including means associated with a moving table for preventing simultaneous operation of the ram and table moving'means.

Fig. 4 is a sectional view on a larger scale of the control mechanism illustrated in Fig. 3.

Fig. 5 is a sectional view on a larger scale of the three-way valve shown in Fig. 3.

Fig. 6 is a fragmental view taken at right angles to that of Figs. 1 and 4, showing the lower end oi the manual valve in the control mechanism.

Fig. 7 is a plan view of the work table and a motor driven Geneva motion for rotating the table step by step.

F18. 8 is a vertical sectional view taken substantially on the line 6-4 oi -Fig. 7.

In the drawings we have illustrated. a bench type hydraulic press of generally G-shape in which are enclosed the sump or tank which holds the liquid supply, the liquid pump, the motor ior driving the pump, the vertically disposed reciprocating fluid motor and valve means for controlling the operations of the fluid motor. A ram 20, directly connected with the piston oi the fluid motor depends from the overhang of the C-shaped press. On this ram there is carried a. rearwardly extending arm 2i which is adapted to engage a collar on a vertically disposed shipper rod 23 when the arm is at the top of its travel.

011 the projecting lower member oi the 6- shaped frame of the press there is mounted the hollow lease 24 of a rotary worlr table construc tion having a circular table member 25 which ro tates step by step and is provided with a plurality of stations each of which assumes a position under the ram in alignment therewith as the table movement progresses. As will appear here:- inafter, the table isrotated by a Geneva motion. the actuator 01' which is driven by a vertical shaft 26 extending upwardly into the table base and driven through reduction gearing by an electric motor 21.

The ram is attached to a piston indicated at 28 in Fig. 3 which reciprocates in a cylinder 29 mounted in the housing of the press, the parts ll and 28 constituting a reciprocating fluid motor. the reciprocations of which are governed by a control mechanism indicated generally at ll, which is also located within the housing and may be conveniently attached to the fluid motor, as shown in the copending application of William C'. Denison, Jr., Serial No. 562,244, filed November 6, 1944, now Patent 2,557,265, granted June 19, 1951.

The control mechanism 30 is similar to that disclosed and claimed in the copending application of Cecil E. Adams, Serial No. 589,163, filed April 19, 1945, now Patent 2,491,355, dated December 13, 1949, except that the valve spool 3| ditlers somewhat from the corresponding part in the said application. Also in the present invention bore 32 constitutes an exit port from the control mechanism leading to an external circuit for pressure fluid, and port 33 is a return or intake port also connected with the external circuit, whereas in the said cppending application bore 32 is closed by a plug and 33 is merely an internal passage.

Exit port 32 is connected by a conductor indicated at 34 with the central port 35 in the housing 35 of a three-way valve. A second port 31 in that housing is connected by means of a conductor indicated at 38 with the intake port 33. As will be explained somewhat more in detail hereinafter, the connection of the conductors 34 and "by the three-way valve at times when the ram'is at the top of its'travel. causes pressure fluid to be delivered to the control mechanism through intake port 33 for reversing the pressure and exhaust connections to the power cylinder 23, and thereby causing the ram to begin a cycle of power and return strokes. I

When the valve spool 3| is set in the position of Figs. 3 and 4 of the drawings the operation of the ram may be controlled by the three-way valve,

that is to say the ports 35 and 31 must be put in communication momentarily in order to start a new cycle of ram movements. If it is desired to interpose an idle period between successive reciprocations of the ram it is necessary merely to permit the three-way valve to remain in the position illustrated so that port 35 is connected with a third port 33 from which pressure fluid flows through a conductor 40 leading to tank, either with or without doing useful work enroute.

The three-way valve may be operated manually or automatically. As herein used it is interlocked with the operation of the actuator of the Geneva motion which drives the rotary work table. As

' will be apparent however, this is but one of many should be had to the above mentioned copending application, Serial No. 589,163. 'Ihe casing 4| of the control mechanism is provided with a pressure port 42 which is directly connected by conductor 43 with a liquid pump 44 that draws liquid through a conductor 45 from a tank 45. In a. bypass 41 leading from conductor 43' back to tank 45 there is a pressure relief valve 48 of conventional form which limits the pressure that may be delivered to the control mechanism. From an annular cavity 43 in the casing 4| a conductor 50 extends to the upper end of cylinder 23. Another annular cavity is connected by a conductor v 52 with the lower end of cylinder 23. An exhaust port 53 near the top of the control mechanism is connected by conductors 54 and 55 with the tank 45. Conductor 55 also connects with conductor 45, so that exhaust fluid from the three-way valve may be directed back to the tank 45. A pressure gauge 55 may be connected with, conductor 50,

and is provided with a shut-off valve 51 inasmuch as rapid fluctuations of pressure make it inadvisable to permanently connect the gauge into the line.

The housing 4| of the control mechanism has closure at its lower end and being closed at the top by a cap 8| provided with a central perforation 52. Inside the sleeve 55 there is a hollow shuttle 53 which is biased downwardly by a compression spring 54. Sleeve 53 has a depending stem 55 which is connected by a coupling 55 with the upper end of shipper rod 25. The latter and the sleeve 50 are illustrated in their uppermost position to which they are carried by the ram arm 2| engaging adjustable collar 22. A spring 51 surrounding stem 55 tends to move the sleeve down into engagement with a washer 55 at all times when the lowered position of arm 2| will permit.

In the illustrated position of the parts corresponding to the idle condition of the ram at the top' of its travel. pressure fluid may flow from pressure port 42 through radial ports 15 in sleeve .55 into an annular cavity 1| in shuttle 55-. and

outwardly through radial ports 12 into an an-' nular cavity 13 which connects with the inner end of bore 32. An annular cavity 14 in spool valve 3| connects the inner and outer portions of bore 32. Thus when the sleeve valve 55 is up and the shuttle 53 is down as illustrated, pressure fluid may flow from pressure port 42 to exit port 32 and into conductor 34. depressed slightly, as it will be immediately after the ram starts down, this path of flow for pressure fluid is cut off by the movement of sleeve ports 12 out of register with the annular cavity 13.

In the position of the parts illustrated'in Figs. 3 and 4, live fluid flows from port 42, in the manner just described, through the control mechanism to port 32 and thence to exhaust by way of the three-way valve. Annular cavity 5| is blocked off and pressure fluid is confined within the cylinder 23 below piston 23 to hold the ram raised. At this time the upper end of cylinder 23 is connected with exhaust through conductor 53, annular cavity 43, radial ports 82, the bore of sleeve 50 and radial ports 13 with space 53 at the top of the valve housing, this space communicating with exhaust port 53 and conductor 54 leading to the tank 45. This condition prevails until the plunger 84 of the three-way valve is moved from the position of Figs. 3 and 5 inwardly against coil spring 85 to break the connection between ports" and 33 by way of annular cavity 85 and connect ports 35 and 31. Pressure fluid is then caused to flew back to the control mechanism through conductor '38 into port 33.

Port 33 is in communication with cavity 15 in the valve housing which in turn is in communication with radial ports 15 that communicate through the small passages illustrated with the space at the bottom of the shuttle 53. There are constricted passages '11 and 18 in the shuttle which lead to exhaust through the hollow body of the shuttle and through radial ports 13 as well as perforation 52 into the space 53 at the top of the housing which communicates directly with exhaust port 53 and exhaust conductor 54 leading to the tank. However these constricted passages cause pressure fluid from port 33 to accumulate and build up pressure under the shuttle sufllcient to shift it upwardly against the action of spring 54. When this occurs the pressure and exhaust connections with cylinder 23 are reversed and' the ram is caused to start down. This reversal takes place in a manner which will now be described.

when the sleeve is an annular with the shuttle in its up position the connection'of cavity is with exhaust, by the ports and -es above described, is cut on; At the same time live fluid is introduced into cavity 49 and thus into the space in cylinder 29 above the piston. that is'trom pressure port 42 through radial ports III, annular cavity II in the shuttle, and radial ports 82 in the sleeve. The lower part of cylinder 29 is connected with exhaust at this time, that is annular cavity 5| in the valve housing is connected through a set of radial ports 88 in the shuttle and thence through constriction 18 in the shuttle with the bore 89 of the shuttle and through passage 62 in cap 6| to space 80 and 'port'" which leads through conductor 54 to the tank. As soon as the ram moves downwardly a fraction of an inch the sleeve 60 will be forced downwardly by spring 61 until stopped by the engagement of a collar so with the bottom of a cavity 9| in the housing ll. Collar 90 is vertically slotted part way of its length to accommodate a pin92 that extends through a transverse bore in the stem 65. When the sleeve 60 is thus forced down ports 12 are carried out of register with annular cavity I3 and pressure flu'd is thereby cut off from conductor 34. The introduction of pressure fluid to the space below shuttle 63 is therefore momentary only, but back pressure fluid is supplied thereafter from the space beneath the descending piston 28 and caused to flow through constriction 11 in the shuttle into the space below the shuttle to hold the'latter elevated against the action of its spring 64 for so long as the ram continues to descend. As soon as this back pressure is relieved either by the contact of the ram with the work or by the shifting of shipper rod 23 downwardly on account of the arm 2i striking an adjustable collar 69 to pull the sleeve 60 down far enough to cut oil" the annular cavity fit from the radial ports M, then the lack of fluid pressure beneath the shuttle will enable the spr'ng M to shift the shuttle downwardly into contact with the bottom of the sleeve, whereupon the pressure and exhaust connections to the fluid motor will be reversed and the ram will travel upward until the arm 2i again raises sleeve st to the position illustrated in the drawings, permitting live fluid to exhaust freely through conductors M and M, and leav ng pressure fluid trapped within the lower part of the power cylinder to hold the ram in its uppermost position.

Valve spool 3| is manually operated. It is shown in the position in which it is set for automatic or semi-automatic operation involving the three-way valve. This spool has a bore 93 extending from its upper end down to a transverse slot 94 into which there extends a pin 95 that is eccentrically mounted in a trunnlon'flfi from which there extends a concentric shaft 91 having a handle 98, Fig. 6, for manipulation by the operator. In the position shown the pin 95 holds the spool 31! in a lowered position against the action of a compression spring 99. Inasmuch as pin 95 is thrown over center and into contact with the end of slot 94, as illustrated in Figs. 3 and 6, spring 99 will hold the spool in this position. When the handle 98 is moved toward the left from the position illustrated in Fig. 6 to a position past center, the spring 99 will cause the spool to rise until its upper end contacts a flange Hill on a hollow plunger llll which is siidable with respect to the bore 93. A coil spring I02 bears against this flange and therefore tends to stop the upward movement of the spool when it comes flush with the upper end of bore I. Spring I02 is stronger than spring 99. Hence when the handle is thrown to the left beyond center from the Fig. 6 position and then released, the spool will stand with its upper end ilush with the upper end 01' the bore. However, it may be raised above that point by manipulation of the handle. In all positions of the spool 3| except a position in which the shoe] is raised above the upper end of the bore 59 the land" I" on the spool blocks an annular groove III! in the' housing. However in the highest position of the spool the lower end of land I03 uncovers'groove IM to a slight extent, in whichcase pressure'iluid is exhausted from the space beneath the shuttle by way of the transverse slot 94, here 93, space 00 and'exhaust port 53, this position being provided in order that the operator may at anytime stop the downward'movement of the ram and cause it to return to its up or idle position.

when the upper end of spool 3| is in engagement with the flange IN the lower edge of the upper land uncovers an annular cavity I in bore 59 connected with cavity 49. When thus positioned and sleeve is moved to open ports 12 to cavity 13, pressure fluid will flow upwardly in cavity ll through cavity I 50 tocavity'lS and thence to tank via ports 82 and I9, cavity '80, port'53 and conductor 54. The fluid will thus bypass the three-way valve and no pressure will be applied to the underside of the shuttle 63. The ram will therefore remain at rest in an elevated position. A single cycle of ram operation can be secured if des'red while the motor 21 is'in operation by swinging the handle 98 downward and holding it until the ram starts its cycle, after which the handle 98 may be released.

Referring now to Figs. 7, 8 and 9, it will be noted that the hollow base 24 of the table structure has a separable cover plate 005 which is attached at its periphery to the base it by means of a plurality of screws M6 or the like. At the center oi this cover plate there is a round openlug lflll which is in alignment with the periphery of a cavity Wild in the bottom of the base. Bushings W9 and H0 received within this opening and cavity constitute bearings for a rotatable hub lil having arms 'in which are formed radial slots i it, this hub with its radial slots constituting the driven member of a Geneva motion. The rotary table 25 is surmounted at the center with a plate H3 having perforations for the reception of screws H4 which extend through smooth holes in table 25 and into threaded openin s in hub Ill. Near its periphery cover plate N15 has a raised rim forming a bearing surface for table 25, in which are formed three concentric grooves H5 through which lubricating oil is caused to circulate.

A convenient means for accomplishing this circulation of oil is to utilize the plunger 84 of the three-way valve as a. pump plunger. The three-way valve is mounted in the hollow base 24 which serves as an oil sump. A pump chamber H6 is provided at one end of the housing '36. An opening HI through the housing serves 11 and 13.

, 7 I22 and I23 through which oil is returned to the sum Tife base 24 of the table structure is provided at three evenly spaced points with cylindrical bearing members I24 open top and bottom and registering respectively with three cylindrical bearing members I25, I25 and I2'I in the cover plate I". These latter bearing members provide a three point support for the rotary table in addition to the peripheral support provided by the rim of the cover plate I35. The bearing member I25 is positioned in alignment with the ram. The table 25 has six stations which are adapted to be brought into alignment one after another with the bearing I25. In the table illustrated these stations consist of small circular cavities I20, butthey may take other forms and may in some cases comprise openings through the table, through which punchings may be driven downwardly through the cylindrical bearings I25 and I24 into a suitable container or discharge chute.

.The Geneva motion comprises an actuator which rotates continuously, provided motor 21 is in operation. This actuator has a hub I30 which is mounted at its upper and lower ends in bearings formed by bushings I3I and I32 carried in the base 24 and cover plate I05. It has an axial socket I29 in its lower extremity which receives and is keyed to vertical shaft 26 driven by motor 21. Hub I30 has a bifurcated radially extending arm I33 carrying between the bifurcations a roller I34 of a size to fit within the slots II2 of the hub III. Hub I30 also carries a cam plate I35 which is disposed to engage a roller I33 mounted in the protruding end of plunger 34 of the three-way valve. Cam plate I35 may be adjusted to either of two different positions illustrated in Figs. 10 and 12, and by this means the actuation of roller I35 may be so eflected as to time it with the rotation of the table either clockwise or counterclockwise. A

pin or screw I3I mounted in the hub I30 takes into an arcuate slot I50 in the cam plate I35 and engages cheer the other end of thatslot,

7 to cause collar 23' to open switch I38.

I33 is another normally closed limit switch dis- V posed as shown in Fig. 2, the operating arm I40 of which carries a roller I4I that runs upon a cam I42 that has an arcuate slot II therein to accommodate a key I52 in shaft 25. Cam I42 may occupy either of two positions with the key I52 engaging one or the other end of slot I5I, and it may be held in either of such posi-- tions by a'set screw I 53, as indicated in Figs. All of the adjustments necessary when the direction of rotation of the motor is changed may therefore be made without dismantling any of the parts.

Operation-Starting with the ram in its idle position at the top of its travel, and the control mechanism and three-way valve in the positions illustrated in Figs. 3, 4 and 5, the operation is as follows: i

Live fluid is now flowing from pump 44 through the control mechanism 30, conductor 34, port 35 of the three-way valve, annular cavity 95 of plunger 34, port 33 and conductor 43 back to the tank. The plunger 34 is biased to the position illustrated by spring 35 working against a stop I45. The pump is relieved of load. The ram may now be started on its down stroke by moving the plunger 34 to the left in order to cut off port 30 and connect ports 35 and 31 for introducing pressure fluid momentarily into port 33 and thereby lifting shuttle 03, which permits fluid to exhaust from the lower end of cylinder 29 and live fluid to enter the upper end of that cylinder. The ram is thus started on its power stroke.

Plunger 34 may be operated in various ways, including manual operation. As herein shown however, its operation is etfectedautomatically by the actuator of the Geneva motion, which drives the work table 25 step by step. Looking down upon the table, Fig. 7, rotation is in the counterclockwise direction. To accomplish this the actuator rotates in the clockwise direction. as indicated in Figs. 10, 11 and 14. Figs. 7 and 10 show the actuator at the conclusion of a table movement. As the actuator continues to revolve, the cam I35 engages roller I35 and forces plunger 84into housing 30 against the action of spring 05.

Dircctly after the ram starts down, the shipper rod 23 descends and with its sleeve 50 causin8 ports 12 to leave registration with annular cavity I3. The flow of live fluid through conductor 34 to the three-way valve is thus cutof! and the entire volume of the pump becomes available to operate the fluid motor.

The ram travels down on its power stroke until it strikes the work or until the ram arm 2I strikes collar I9, at the election of the operator, whereupon the direction of travel of the ram is reversed as previously explained. While this travel of the ram down and up is proceeding the actuator arm I33 is revolving from the position of Figs. '7, 10, 11 and 14 through 180 more or less, depending upon the length of stroke of the ram, which may be varied within limits to suit the work to be done. Switch I39 is open while the ram is moving, but switch I39 is closed'during this time or for 180 of movement of the Geneva driver from the position illustrated in Figs. 11 and 14. In case the ram travel is completed in less than 180 of movement of the actuator, the switch I33 will close before switch I39 opens, in which event the motor will operate continuously. In case the stroke of the ram is so long and requires so much time that switch I38 remains open after switch I39 opens, current to the motor will be interrupted and the motor will stop. It is provided with a brake which will bring it to a sudden stop. 60 of actuator movement are provided for effecting this stop, as will be apparent from Fig. 14. The time interval corresponding with this 60 movement has been found to be suflicient for the purpose at the rate of actuator rotation which we have employed in practice. However the angle for motor stopping may be varied if necessary by changing the cam I42 to increase the period during which switch I39 is maintained open. As soon as the ram returns to its uppermost position switch I30 will close and current flow to the motor will be resumed and the actutor will resume movement. Its last of travel is the active part of its movement, that is the part which turns the work table one-sixth of a revolution. This table movement is prevented until after the ram movement has ceased and v the switch I39 is closed accordingly. As soon as the table movement is completed, cam I35 actuates roller I36 to provide a pressure impulse for shifting shuttle 83 upwardly, and the-next cycle of ram movement begins. These operations continue indefinitely, or until the motor 21 or the motor driving pump 44 is stopped by having its current supply cut off. The operator may also stop the ram temporarily at any time by moving handle 38 from the Fig. 6 position clockwise iar enough to release the handle and enable spring 93 to raise spool 3| to the position in which it engages flange IIIO. Then when the ram reaches the top of its stroke and carries up the sleeve 80 to its illustrated position. thereby connectlng ports 12 with annular cavity 13, the three-way valve is by-passed as previously explained and the pressure fluid is returned to tank. The shuttle therefore will remain in its lower position and the ram will not start down. The Geneva motion actuator will then continue to turn and will presently connect conductors 34 and 33 which, however, will have no effect oi raising shuttle 63 so long as the valve spool I03 is in its raised position, because pressure fluid fed into port 33 will then be exhausted through bore 33 and will prevent the building up of pressure beneath the shuttle sufllcient to overcome the action of spring 64. The table movements will therefore continue, but without eifect upon the fluid motor which drives the ram. This method of stopping the action of the press will be eilective of course only so long as the handle 33 remains in its released position. When emergency reverse is desired, the handle 93 is swung clockwise to its uppermost position and then released by the operator.

In case it proves desirable in any instance to have the work table revolve in the clockwise direction, all that is required is to change the direction of rotation of shaft 26 and adjust the position of cam I35 to that illustrated in Fig. 12 of the drawings. In Figs. 12 and l3the actuator arm I33 is shown in the position which it occupies at the time it completes a movement of the work table. Immediately thereafter cam I35 .actuates roller I36 to provide a pressure impulse for lifting shuttle 63 to begin a ram cycle. Immediately thereafter switch I39 will close, as will be apparent from an inspection of Fig. 13, and the rotation of the actuator through 180 will be insured. Rotation beyond that point will be contingent upon the travel of the ram, as previously explained in connection with the above description of operation for counterclockwise movement of the table.

Having thus described our invention, we claim:

1. In combination, a reciprocating fluid motor, a ram driven thereby, a movable work table for presenting work to the ram, means for moving said table intermittently, control mechanism for said motor adapted to cause reciprocation of the motor through a cycle of power and return strokes, said mechanism having an exit port for live fluid open only when the motor is idle between cycles, said mechanism comprising pressure responsive means for initiating motor reciprocation, and said mechanism having an intake port in communication with said pressure responsive means, a three-way valve, two conductors leading therefrom to said exit and intake ports respectively, and a third conductor leading therefrom to exhaust, said valve being biased to connect said exit port conductor with said exhaust conductor, and an' operative connection between said work table moving means and said three-way valve effective after each work table movement for shifting the valve to connect said exit and intake ports.

2. In combination, a fluid motor. a variable stroke ram driven thereby, a rotary work table disposed in operative relation with said ram; a Geneva drive for intermittently rotating said work table, said Geneva. drive having a star wheel and a driver intermittently engageable therewith, an electric motor for operating said driver, control mechanism for said fluid motor, said control mechanismhaving an element responsive to fluid pressure to initiate a cycle of operation of said fluid motor, a valve member actuated by said driver upon initial disengagement from said star wheel to direct fluid under pressure to said control mechanism to initiate a cycle of operation of said fluid motor; and control means for said electric motor operated in part by said driver and tending to break the motor circuit prior to reengagement of the driver with said star wheel, said control means also being operated in part by said ram to maintain the motor circuit broken until the cycle of operation of said ram is completed, whereby each table indexing cycle includes an idle time of varying duration dependent upon the length of cycle of operation of said ram.

3. In combination, a fluid motor, a ram driven thereby, a movable work table for presenting work to the ram, means for moving said table intermittently, control mechanism for said motor responsive to pressure fluid entering the mechanism through an intake port thereof for starting the ram on a cycle of power and. return strokes, a slide valve biased in one direction by spring action and adapted when shifted to a given position against the action of its spring to direct pressure fluid into said intake port, and means set in motion by said table moving means for shifting said valve to said given position, one end of said valve functioning as a piston pump for forcing lubricating oil to hearing parts of said table.

4. In combination, a fluid motor, a ram driven thereby, a rotary work table disposed in operative relation with said ram, a Geneva motion for rotating said table step by step, said Geneva motion comprising a rotating actuator, control mechanism for said motor responsive to pressure fluid entering the mechanism through an intake port thereof for starting the ram on a cycle of power and return strokes, a valve adapted when in a given position to direct pressure fluid into said intake port, a cam on said actuator, and a follower associated with said valve eifective when engaged by said actuator for shifting the valve to said given position, said cam being angularly adjustable to take two different positions on said actuator in order to properly time actuation of the valve for either direction of rotation of said actuator.

5. In a machine of the character described, a table structure comprising a hollow base forming an oil sump, a hub rotatably mounted in said base, a table attached to said hub having bearing contact with said base, said base having a plurality of concentric grooves in its upper surface near its periphery, and means for circulating oil from said sump through said grooves.

6. In a machine of the character described, a table structure comprising a hollow base forming an oil sump, a hub rotatably mounted in said base, a table attached to said hub having bearing contact with said base, said base having three 11 concentric grooves in its upper surface near its periphery, means for pumping oil from said sump into certain oi. said grooves and discharging oil from the remaining groove or grooves back to the sump.

7. In combination, a ram, means for driving the same to cause'reciprocation through a cycle power and return strokes, a rotary table, an electric motor, an electric circuit therefor. a rotating actuator driven by said motor for turning said table step by step to present successive work stations to said ram, two switches arranged in parallel in said motor circuit, one switch being open during more or less of the first 180 of actuator travel .tollowing a table movement, depending upon the length or stroke of the ram, and the other switch being open during the last 180 of actuator travel, whereby current to the motor is interrupted in case the time of ram travei-over- .tmding to disable said power supply circuit during more or less of the first 180 of actuator travel following a table movement, depending upon the length of stroke of the ram, and the other control tending to disable said power supply circuit during the last 180 of actuator travel, whereby power supply to the motor is interrupted in casethe time oi. ram travel overlaps the second 180 of actuator travel. 9. In combination, a ram, means for driving the same to cause reciprocation through a cycle of power and return strokes, a rotary work table, a motor for operating said table, motion-trans- ,n'iitting' means between said motor and said wori table for intermittently actuating the latter. said motion-transmitting means having driving and. driven elements intermittently disposed in driving engagement to transmit movement to said table, control means for governing the flow oi motivating force to said table-operating motor, said control means being operated by said ram and said table motor to interrupt the flow of motivating force to said table-operating motor during a portion of a cycle of movement of said ram when the driving and driven elements of said motion-transmitting 'means are not in driving engagement.

10. In combination, a mm, a reciprocating fluid motor for operating said ram through a 'cycle of power'and return strokes, a rotary table for presenting work to said ram, a motor for operating said table, motion-transmitting means between said motor and said work table, said motion-transmitting means having driving and driven elements intermittently disposed in driving engagement to transmit intermittent movement to said table,'controi means for governing the flow oi motivating force to said motors. the control means being actuated by said ram and the driving element or said motion-transmitting means, said control means being operative to establish a flow o! motivating force to said ram motor to initiate operation of said ram upon dis engagement of the driving and driven elements of said motion-transmission means and operative during a portion of a cycle of movement of the ram when the driving and driven elements 01 the motion-transmitting means are not in driving engagement to interrupt the flow or motivating iluid to said table-operating motor.

11. In combination, a ram, a reciprocating fluid motor for operating said ram through a cycle of power and return strokes, a rotary table for presenting work to said ram, a motor for operating said table, motion-transmitting means between said motor and said work table, said motiontransmitting means having driving and driven elements intermittently disposed in driving engagement to transmit intermittent movement to said table, control means for governing the flow of motivating force to said table-operating motor,

said control means being operated jointly by said ram and the driving element of said'motiontransmitting means and serving to interrupt theflow of motivating force to said table-operating motor during a portion of a cycle of movement REFERENCES CITED The following references are of record in the tile 01' this patent:

UNITED STATES PATENTS

US2561766A 1945-06-21 1945-06-21 Hydraulic press Expired - Lifetime US2561766A (en)

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US2580063A US2580063A (en) 1945-06-21 1949-08-09 Control mechanism for fluid motors

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459079A (en) * 1967-09-29 1969-08-05 Koppy Tool Corp Indexing machine
EP0059808A2 (en) * 1981-02-05 1982-09-15 Ed Frogerais SA Improvements in or relating to tablet making machines
US20160319812A1 (en) * 2015-05-01 2016-11-03 Graco Minnesota Inc. Pneumatic timing valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US772113A (en) * 1903-01-22 1904-10-11 Herman Osswald Power-press.
US880413A (en) * 1905-03-14 1908-02-25 Oberlin Smith Notching-press.
US2016710A (en) * 1930-08-04 1935-10-08 Oilgear Co Self-feeding hydraulic press
US2112419A (en) * 1934-08-13 1938-03-29 Gillette Rubber Company Process of and apparatus for making patches
US2319232A (en) * 1941-07-08 1943-05-18 Gen Motors Corp Hydraulic press
US2367241A (en) * 1939-03-18 1945-01-16 French Oil Mill Machinery Control for fluid operated motors
US2374464A (en) * 1941-04-04 1945-04-24 Littell Machine Co F J Power-driven dial feed

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US772113A (en) * 1903-01-22 1904-10-11 Herman Osswald Power-press.
US880413A (en) * 1905-03-14 1908-02-25 Oberlin Smith Notching-press.
US2016710A (en) * 1930-08-04 1935-10-08 Oilgear Co Self-feeding hydraulic press
US2112419A (en) * 1934-08-13 1938-03-29 Gillette Rubber Company Process of and apparatus for making patches
US2367241A (en) * 1939-03-18 1945-01-16 French Oil Mill Machinery Control for fluid operated motors
US2374464A (en) * 1941-04-04 1945-04-24 Littell Machine Co F J Power-driven dial feed
US2319232A (en) * 1941-07-08 1943-05-18 Gen Motors Corp Hydraulic press

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459079A (en) * 1967-09-29 1969-08-05 Koppy Tool Corp Indexing machine
EP0059808A2 (en) * 1981-02-05 1982-09-15 Ed Frogerais SA Improvements in or relating to tablet making machines
EP0059808A3 (en) * 1981-02-05 1983-07-20 Ed Frogerais SA Improvements in or relating to tablet making machines
US20160319812A1 (en) * 2015-05-01 2016-11-03 Graco Minnesota Inc. Pneumatic timing valve

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