US2319232A - Hydraulic press - Google Patents

Description

May 18, 1943 J. O. HOLMES Emu HYDRAULIC PRESS I a 2 n i m E 6 a? w an NvENToRs 2 0.. O Q Q 0 ATTORNEW May 18, 1943 .1 Q. HOLMES ETAL HYDRAULIC PRESS Filed July 8, 1941 '6 Sheets-Sheet 2 IZATTORN E YS May 18, 1943 J. QQ HOLMES arm.

HYDRAULIC PRESS Filed July 8, 1941 ATTORNEY.

6 Sheets-Sheet 3 May 18,1943 J. Q. HOLMES ETAL HYDRAULIC VPRESSYY 6 Sheets-Sheet 6 Filed July s, 1941 /l VEINTORJV J5 2m 2* r-FJ TORNEY M m? a i W 4% 3 /+m ,4 Wm W/ N o .1 m. r4 W I, p w u n m m, w am.

Patented May is, 1943 p I nvmmumc mass John Q. Holmes and Calmer E. Gordon, Anderson,

Ind., assignors to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application July 8, 1941, Serial No. 401,544

2 Claims.

This invention relates to hydraulic presses having rotary plate conveyors carrying a plurality of work holders which are automatically moved into position to be operated upon by the ram of the press. v t

It is an object of the invention to provide a self contained hydraulic press unit of the enclosed type which can be adapted for various kinds of workand operations by the selection of suitable subassemblies .of a number of inter changeable subassemblies.

In the disclosed embodiment of the press this object is accomplished by providing a table supported by a base which encloses a reservoir for containing a pressure fluid and a motor drive pressure pump. unit'mounted over the reservoir. The table supports a pedestal onone side of which is mounted a ram unit providing one or morerams operated by pistons operating in hydraulic cylinders. The table supports a rotary plate conveyor or dial feed which maybe one selected from a number. of interchangeable dial.

feed units. 'The pedestal, which supports the ram unit, provides an enclosure for a dial feed operating mechanism and for a cam operated valve for controlling the admission and the discharge of .pressurevfluid, with respect to the ram cylinder in timed relation with respect to movements of the dial feed. The dial 'feed operating mechanism and the valve-controlling cam are operated by an electric motor contained within the housing provided by the pedestal.

Further objects and advantages of the present invention will be apparent from the following description, reference being had'to the accompanying drawings'whereiri two embodiments of the present invention are clearly shown.

In the drawings: I

Fig. lis a side elevation ofjan hydraulic press embodying the present invention.

Fig. 2 is a front elevation.

Fig. 3 is a fragmentary side elevation of the press shown in Fig. 1, but with a dial feed of larger diameter than shown in Fig; 1.

Fig. 4 'on Sheet 2 and Fig. 6 on Sheet 3, together constitutea'sectional view on line 4-4 of Fig. 2.

Fig. on Sheet 2, and Fig. '7 on'Sheet 3, to-

gether constitute a view in the direction of arrow 5 of Fig. 1 with certain parts of the frame work in section to show the interior.

Fig. 8 is a composite view in arrow 8 of Fig. 3 and comprises segments AB BC and CA. Segment AB is a plan view of the dial feed; BCis a sectional view on line'BC of Fig. 9; and the segment CA is a sectional view on the line CA of Fig. 3.

the direction of Fig. 9 is a sectional view on line 9-9 of Fig. 8.

Fig. 10 is a sectional view on line Ill-l0 of Fig. 8.

Fig. llis a. sectional view of a friction clutch unit taken on the line l|--ll of Fig. 5.

Fig. 12 is a sectional view of a flexible coupling" 14 of Fig. 15 and shows the underside of the upper subassembly of the tool which operates upon the work.

Fig. 15 is a sectional view on line |5l5 of Fig. 13.

Fig.'16 Fig. 15.

Fig. 17 is an enlarged fragmentary sectional view of the assembly of parts which are assembled by the machine.

Referring to Figs. 1 to 7, the machine comprises a base 20 providing a tank 2| divided by baffle walls22 and 23 (Fig. 6) for containing a hydraulic pressure fluid. These walls tend to eliminate the effects of foaming of the fluid. The tank 20 supports a cover plate 25 providing is a sectional view on line .l6- l6 of .a base for supporting certain elements of the pling and flywheel fan unit 33 shown in section in Fig. .12. The unit 33 comprises a hub hav ing a-keyway35 for receiving a key by which the hub-34 is connected with shaft 3|. The hub 34- supports a sleeve 36 having a flange 31 connected by webs 38 with the flywheel rim 39. The webs 38 are shaped to providefan blades. During-the rotation of the unit 33 air is caused to flowin the direction of the arrows 40 and 4| thereby inducing the flow of air around the motor for cooling purposes. "The sleeve is keyed to'the hub 34 by a plurality of dowel pins 42 which serve to connect the hub also'with a plate-43 integral with hub '44 keyed to the shaft 32.

The shaft 32 turns a rotary pump 45 which withdraws pressure fluid fromtank 2| thru a pipe 46 and discharges the fluid under pressure thru a pipe 41 leading to one or more pressure cylinders to be described. The pressure cylinder discharges thru, piping connected thru pipe 48 connected with a return pipe 4! which serves also as a by-pass in case the hydraulic pressure exceeds a certain amount. A by-pass valve 58. connects pump 45 with pipe 41, and automatically opens a by-pass from the pump 45 to the tank 2I thru the pipe 48' when the pressure exceeds a predetermined limit which can be adjusted. The unit5I -is a pressure gauge connected with valve 58 by a hand operated valve 52.

The plate supports two side plates 58 and 8| of channel shaped cross section as shown in Fig. 7. The plates 88 and GI are joined at both ends by a plate 82, Fig. 2, thereby providing a box-like frame which encloses the motor driven pump 45. The plates 54 and ii are provided with openings 58a and Na respectively, covered by panels of wire mesh 83. Air for ventilating the pump may enter thru the screened openings 88a and Ho. Th frame members 88 and GI sup- Fig. 2 or the right hand face of-wall 12, as viewed in Figs. 1 and 4, is provided with a mounting pad a tool subassembly I25. The ram I23 is prevented port a platform or table 18 which supports a and 18 are shaped so as to receive a curved plate 88 anda flat, rectangular plate 8|. Thus the web 12 of the casting 1| its side walls 18 and 18 and the plates 88 and 8I provide an enclosure for an.

electric motor and the mechanism operated thereby for driving the rotary conveyor or dial feed'of the machine and for operating the timing cam for controlling a valve which controls the intake and exhaust of pressure fluid with respect to an hydraulic cylinder which operates the pressure ram of the machine.

The walls 18 and 18 provide brackets 82 for receiving a plate 83 which supports a power operated unit 84 comprising an electric motor 85 connected with a shaft 88 thru the medium of speed reducing gearing in a housing 81. As shown in Fig. 11, shaft 88 is connected by key 88 with a sleeve 88 provided with a flange 8| to which friction plates 82 and 83 are attached by a plurality of rivets 84. The sleeve 88 is horizontally splined at 85 to provide a driving connection with a plate 88 to which friction plates 81 and 88 areattached by a plurality of rivets 88. Between the plate 82 and th plate 98 there is located a friction disc I88 having a driving connection to the integrally splined portion I8I of the flange I82 of a disc I83 attached by screws I84 to a sprocket gear I85. The flange I82 is provided with a plurality of sockets I88 each for receiving a spring I 81 for exerting pressure toward the right against a nut I 88 attached to a screw I88 the head I II of which bears against a pressure plate I II bearing against the friction disc 81.

The sprocket gear I85 of unit 88 is connected by a chain II2 with a smaller sprocket II3 keyed to a shaft II 4 the left end of which is journalled in a ball bearing II5 supported by bracket H5 attached to table 18 as shown in Fig. 4. Shaft II4 operates a cam II5 for engaging a roller I I1 on the end of a horizontal valve-operating reciprocating rod, not shown. A spring, not shown, urges roller I I1 toward the right and against the cam II6 having lands IIGa, H81), and N80. The

roller H1 is moved by the cam H6 or by the spring referred to in order to control the operation of a valve I28 with which the pipes 41 and 48 are connected.

The front fac of the wall 12 as viewed in from rotating by a key I25 attached to casting I22 and received in a groove I21 in a ram I23.

Ram I23 receives a screw I28 having a hex head I28. The head I28 is integral with an extension I38 of reduced diameter having a head I3I of larger diameter. Head I 3| is received by recess I32in piston rod I33. The part I38 is received by a notch I34 less in width than the recess or notch I32. By turning the screw I28 the distance between the ram I23 and the rod I33 can be adjusted in order to raise .or lower the ram I23 and the tool unit I24 carried thereby when the piston I34 connected with rod I33 is in the lower position. Piston I34 is slidable within a cylinder I 35 secured to a block I 38 apertured to receive a bushing I31 carrying a liquid sealing ring I38 secured by a plate I38 attached to the block I36. Below piston I34, the cylinder I is connected by pipe I48, L I4I, union I42 and pipe I43 with valve I28. Above the piston I34, th cylinder I35 is connected by pipe I44, L I45, union I48 and pipe I41 with valve I28.

Referring to Fig. 5, the rotation of cam H8 is counterclockwise. When roller II1 rides on the land IIIia of cam II5, valve I28 is so conditioned that pressure fluid is admitted through the pipes I41 and I44 to the upper end of cylinder I35 while the lower end of the cylinder is connected by pipes I48 and I43 with the exhaust port of valve I 28. connected by pipes 48 and 48 with the reservoir 2I. When the roller II1 rides on the land II 51; conditions are reversed so that pressure fluid will be admitted to the lower end of cylinder I35 while the upper end. will be connected with exhaust. When the roller II1 rides on land 50, pressure fluid is trapped in the lower end of cylinder I35 and the output of the pump passes under low pressure to the reservoir. While the roller H1 is riding on the land II8c, the shaft II4 operates a mechanism for rotating a rotary conveyor or dial feed to be described.

The casting I22 is provided with a groove I58 for receiving any oil that may leak through the packing I5I between the cylinder I35 and the block I38. A tube I52 conducts the oil from groove I58 to a pan I52a (attached to rod I28) which also receives any oil which may leak past the packing I38. Oil caught by the pan I 52a passes through a hole I52b and then through a passage I53 of the casting I22, through a passage I54 of casting 13, and through a drain pipe I55 leading to the reservoir.

As stated before, casting I22 may be one of a series of interchangeable castings, any one of which may be secured to the frame 1I.- Other castings performing the function of I22 may be constructed so as to support a plurality of rams I23 and operating cylinders in case it is desired to perform a plurality of operations simultaneously upon work carried by a plurality of workholders carried by the conveyor. In case the machine is provided with a plurality of cylinders I35, the pipes I43 and I41 would be connected respectively with distributing manifolds instead of the single pipes I48 and I44. One manifold would distribute pressure fluid to the lower porintermittently rotating the table tions of all of the cylinders and the other manifold to the upper portions. These manifolds with theirbranch pipes would be enclosed within the housing walls 12, 16 and 16.

Referring to Figs. 1 and 2, it will be seen that the shaft II4 extends to the-right. of .theframe H and into a gear housing providedby a casting v I66 supported by the table 16. Shaft I I4 drives tance greater than the distance between the center of table I6I in frame 1|, it is necessary to use a longer shaft II4a, Fig. 3. a

The mechanism for intermittently rotating the table I6'Ia will now be described withreference 'to'Figs. 8,9 and 10. Housing I66d provides bear ings at I64, I66for shaft 'II4a which drives a gear I66 meshing with a gear I61 keyed to a shaft,

I66 (Fig. 16); Shaft I66 Isjournalled In bearings I66 and I66 provided by the housing I66a.

The right hand portion of the shaft I66 is tubular'and is externally threaded at I6I to receive a nut I62 which when tightened causes the folper tool unit I24. In Fig. v1 only. Onepair of tool units I24 and I is illustrated. The turn table I6I may be provided with asr'nany as 14 of; these particular units. The particular mechanism for shown but it is similar to mechanism to be described in connection with the description of the mechanism for rotating a turntable of larger diameter than the turntable I6I. For presentpurposes it is sufficient to state, referring to Fig. 4, that the table I6I is supported by a step bearing I62 resting on atubular boss I63 integral with the housing I66. A stationary shaft I64 fixed to bearing I62 and provides a journal engaged by bearings I65 fixed to the hub I66 of the table I6I.i Tothe upper end of shaft I64 is secured boss I63 extends upwardly through the step a the hub I61 of a tray I66 divided by integral ribs 7 I66-into a plurality of compartments I16. 'The turn table I6I supports a ring I12 carrying a plurality of hard metal insert bushings I13, there being one bushing for each workholder I25. As

there may be some slight, lost motion in the mechanism for indexing the turntable I6I, it is necessary to bring each workholder I25 Into per-' fect alignment with the upper tool assembly I24. Therefore the upper tool unit I24 is provided with a pilot rod I14 which enters a bushing I13 when the tool unit I24 descends. The entrance end of bushing I13 is slightly tapered so that,

when the rod I14 descends, the lower end of rod I14 will cooperate with bushing I13 in such manner as to shift the table I slightly in o der to align a workholder or lower tool unit I25 with the upper tool unit I24. b I

In order to transmit the force applied by the upper tool unit I24 to. the work and thence to the lower tool unit I25 carried by the turn table I6I, that portion of the turntable ISL-carrying work being operated upon by the tools rides over the plane surface of a plate I15 supported by a knee I16 integral with the frame casting H and integral with a foot I11 resting on the table 16. The housing I66 and parts carried thereby including the table IN and the tray I66 constitutes a unit which may be one of several interchangeable units with which the machine may be equipped. Another of these turntable units is shown in Fig. 3 wherein the housing is I66a and.

other parts similar in character to those shown in Fig. 4 are numbered with similar reference numerals with the aflix a. The turntable I6Ia is intended to carry as many as thirty-six workholdersl25a. Since its diameter is much greater than the diameter of turntable I6I, it is necessary to use a longer table 16. Since a substantial portion of said longer table 16 extends out beyond the base. of the machine the right and of table 16 is provided with nected by a tubular'strut attached'to the base 26.

table I6 la is spaced from lat Wilma bracket I62 Sincethe center of the the frame H at a dislowing. parts to be gripped between the nut I62 supports and drives 'a cam unit I65 having a longitudinal spline connection with shaft I66 as indicated at 166. The camunit I65 can be adjusted longitudinally along the shaft and. locked inthe'desired position of adjustment. For this purpose the central bore I66b of shaft I66 receives a rod 266 connected with the 'cam unit I66 by a cross pin 26I extending through a transverse slot 262 provided in the shaft I66. Rod 266 is provided with'a portion 263 of reduced diameter threaded to receive a nut 264. When the nut s tightened the following parts are clamped be- "ween the nut and a shoulder 265 of the rod 266, namely; anexternally threaded sleeve 266 havinga hex head. 261 and a washer 266. Whenthe nut 264.is slightly loosened. the threaded sleeve 266 may be turned. Since this sleeve is threadedly connected at 266 with the shaft I66, rotation of the sleeve 266 by applying a wrench to its head 261 will cause the rod 263 to move axially and relative to the shaft I66. This will cause the cam unit I65 to be moved longitudinally with respect to shaft I66. When the camI65'has been located in the desired position of adjust-' ment a nut 2I6 threaded on'the sleeve 266 can be tightened down against the right end of shaft I86 and the nut 264 can be tightened against the washer 266 and the latter against the hex head against sleeve 266. In this way, the rod 263 is secured in the desired position of adjustment with respect to the shaft I66. The adjustin parts including the nut I62, the nut 2I6, the hex head 261 and the nut 264 are enclosed by a cu shaped housing 2 secured to the housing I66: by a plurality of screws 2I2.

The cam unit I65 is provided with a cam groove 226 for receiving cam follower rollers 22I. Each roller 22I is mounted on apin 222 attached to turntable Him. The cam groove 226, is so shaped that the table. I6la is moving during about onehalf revolution of shaft I Ma and shaft I66 and Is stationary for about 'one-half revolution. The cam I65 is so related to the cam II6 (Fig. 5)

I which controls the valve I26 that, while the table a bracket I66 conis stationary the ram I23 moves downwardly to cause an operation to be performed on the work piece and then the ram returns to upward position. I As the cam I65 is viewed in Fig. 8, it will be seen that one of the rollers 221a is entering the groove 226 while an adjacent roller 22Ib is moving from the groove, rotation of cam I65 being in the direction indicated by arrow I65a. By the time the roller 22Ia. has arrived at'the noncamming part of the groove indicated at 226a the table I6Id will have been moved into such posi- Y tion that a workholder I25a will havej been brought into alignment with the tools controlled by the ram of the press or at least into such positionthat the bushing I13a Figs. 3' and15 is in alignment with the pilot rod "4:: attached to the upper member of the tool unit. In order to make this alignment as' perfectas possiblethe 'cam 185 is adjustable along the shaft I88 by the means" which has been described with reference to Fig. I

Themechanism which is employed for index ing the smaller turntable I6I, Figs. 1 and 2, is

substantially the same as the mechanism shownv in Fig;v 8, for indexing the larger turntable I8I a. When the machine is equipped with the smaller turntable I6I having only 14 workholders there will'jbe only 14 rollers 22I 'supportedby pins 222. Obviously these pins 222 will be much closer to the .jaxi s'of the shaft I64 than is shown in Fig. 8'.

In jthat case the cam I85'can bejmounted directly onthe shaft II4 andgthe 'countershaft I88 can be nates a case made of Bakelite for an electric switch. Within the case is located a conductor strap 231 electrically connected and mechanicaliv secured by a rivet 232 with a clip 233 for receiving a cartridgefuse. These parts have been assembledon a separate machine. The purpose of the tools shown in Figs. 13, 14 and is to as-' semble with the'case238 three contact straps" 234; three terminal clips 235 and three connecting, tu-' bular rivets 236. The terminal clips 235 are a part of a resistance unit 231 used for controlling the speed of the smaller electric motor such as the defroster motor or the heater motor of'an automobile. The function ofthe machine is to set the three tubular rivets 236 'by'a single stroke of -the press plunger or ram I23.

In Fig. 8 each work holder unit Ia is represented merely by a rectangle. This workholder' unit I25a will now be described in detail with ref-q erence to Figs- 13 and 15. It'comprises a base block 248 having grooves 2 and 242 for-receiving the prongs of the fuse'clip 233 when the switch case 238 rests upon the block 248. As shown in Fig. 15, the vertical outer face of the switch case 238 engages a vertical face of a block 243. attac hed to'block 248. Block 248 supports three riveting anvil pins 244 each having a'pr'o-- jectio'n; 245. Upon each of the anvils'244 there is placed-flangedown, a tubular rivet 236 the up:

per end of which has not yetbeen upset. Each pin 245 will "project thru the opening 'of a rivet.

Then the three terminal clips 235, previously apertured to receive the rivetslwill be"placed around the rivets with the main'part of the'unit 231 resting in a groove 246 provided by b1ock248.

Then the switch case 238'will be placed in posi-"- tion, each of three holes pre-formed-in the case V 165' 284, located within the case 238 are each placedprojecting "end l'por'tio'n's 238 receiving arivet 236. Then cont'actstraps around the upwardly the rivets 236. H The manipulation of the workpieces thereof between the tools scribed.

from which the switch assembly is'madefisperforrnedby the operators of the machine who are located at one side of the turntable 1 61a anjd'loadthev workholder units I25a in advance of movement whichwill now befdegi In the form of tools shown in Fig, '15 the upper tool unit-124a corresponds in function to the-upper tool'unit I24 of Fig. "1'. Ib'c'omprises a-plate 258 counterbored at 25f 'is receivefa disc' 252-secured to the plate by screws 253;""Fr1omdisc' 283 there extends upwardly arod "254 which (as shown in Fig. 4) isreceive'd' within a recess 123a in the ram I23 and is secured by a screw I23b' and a wedge nut I23c. To the plate 2581s attached butthru the interposition of a mechanism ineluded in a riveting unit 268.

The unit268 comprises a base 26I to which screws 262 secure two parallel bars 263 providing ways for the guidance for a sliding plate 264 supporting a bracket 265 grooved at 266 and carrying plates 261 thus providing ways for the vertical sliding movement of a block 268. The base 264 is provided with a downwardly projecting pin 268 engaged by'a spring 218 occupying a slot 211 in a pressure plate I150, corresponding in function to plate I15 of Fig. 4. Plate 264 and bracket 265 and block I68 are caused to move into position shown in Fig. 15 against the action of spring 218 by the cooperation of a cam bar 212 carried by plate 258 with a roller mounted on a rod 214 and occupying a slot 215 in bracket 265. When the plate 258 is in upper position the pilot pin same timethe block 268 will have been urged upwardly byspring 211 until a stop surface 218 engages a pin 219 carriedby the bracket 265. Therefore, when the plate 258 is in the upper position, the portion of the bracket 268 and parts carriedthereby' which are adjacent the switch case 238 will be so spaced from the case 238 that the case may be moved adjacent to bracket 268 by the turntable without interference, During downward movement of plate 258 the cooperation of earn 212 with roller 213 causes riveting anvils 288 carried'by block 268 to be brought into alignment with the riveting 'anvils 244 of block 248 and with the rivets supported thereon; and a spring urged pressure pad 281 will be located above the upper side'of the box 238. Following this movement of the block 268, a pin 282 carried by the disc 252'will engage the block 268 to cause itto move downwardly to the position shown so that the pressure pad 28I' will be urged by a spring 283 against the top of the box 238 tohold' the assembly in position while the riveting .anvils 288 engage the rivets 236 to swedge their upper ends over against the contact straps 234' Following the I as indicated at 236a in Fig. 1'1. riveting operation and while the turntable I6Ia is stationary, the plate 258 is caused to return movetowa rd the .left from the'position shown inFi'g; 15 'so that the turntable I6Ia is free to' move the riveted assembly of switch case 238 and other parts away from the riveting tools and to move 'jth'e succeeding unrivete'd assemblies into position for operation by these tools. I

The tool. units'shownin Figs. 13 t 1'? are merely'illustrative of the types of work which may be carried out by hydraulic riveting-presses. Quite obviously the tools will vary according to the'change 'ofthe work. However, it is apparent that each of these tools will generally comprise an upper member adapted to be secured to the ram of the hydraulic press and a lower member in'- eluding a work holder mounted on the turn table. The two members I 24 and I25 may directly co operate as shown in Fig. 1, or indirectly thru the interposition of a unit such as 260 in Fig. 15. Some types of work requires operations to be performed in steps. If there are two steps to be performed the machine can be equipped with two hydraulically operated tool units which perform operations simultaneously upon work carried by the lower tool units or work holders. The machine may be e'quipped with a bank of three hydraulically operated rams carrying three different upper tool units for performing a progression of operations upon work assemblies mounted upon lower tool units or work holders.

The pump motor 30 and the turntable motor 85 are started and stopped from either side of the machine by push buttons 300 (Fig. 1). The base 20 provides a pocket 30! (Fig. 7) for housing an overload circuit breaker unit 302 which protects the motor 30. The unit 302 is reset by a push button 303 (Fig. 1). While the motors 30 and 85 are operating, the turn table I6! of Fig. 1, or IGIa of Fig. 9, rotates intermittently to carry the work pieces located on the work holders I25 01 Fig. 1 or |25a of Fig. 15 successively under the tool operating ram I23 which is caused to move down and up while the turn table is stationary. The loading of the work holders and the removal of assembled parts from the work holders can be carried on while the turn table is moving as well as when it is stationary,

While the embodiments of the present invention as herein disclosed, constitute preferred forms, it.is to be understood that other forms might be adopted. all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A hydraulic press comprising, frame supported by the base and housing; ed upon a base; a providing a a ram sub-assembly detachably mountits frame and exterior to the housing and comprising a vertically movable, tool supporting ram, a piston connected with the ram and a fluid pressure cylinder receiving the piston; a dial-feed sub-assembly detachably mounted upon the base and comprising a turn-table for carrying a plurality of work holders adjacent to the ram and the tool carried thereby, and comprising a mechanism for intermittently rotating the turn-table; and a motor-operated mechanism located within the frame housing and operatively connected with the turn-table rotating mechanism and including a cam-operated valve for controlling the passage of pressure fluid into the cylinder of the ram unit and the exhaust of said cylinder in timed relation to movements of the turn-table of the dial feed.

2. A hydraulic press comprising, a base providing a tank for pressure fluid; a base cover; a housing supported by the cover; a motor-driven fluid pressure pump located within the housing and supported by the cover; a table supported by the housing; a frame supported by the table and having a vertical wall intermediate the ends of the table and providing a housing at one side of the wall; a ram sub-assembly detachably mounted upon the frame wall and exterior to the housing provided by the frame, said sub-assembly comprising a vertically movable, tool sup-' porting ram, a piston connected with the ram and a fluid-pressure cylinder-receiving the piston; a dial-feed sub-assembly detachably secured to the table and comprising a tum-table for carrying a plurality of work holders adjacent to the ram and the tool carried thereby, and comprising a mechanism for intermittently rotating the turn-table and a drive-shaft extending from the dial-feed unit and into the housing provided by the frame above the table; and a motor driven mechanism located within the frame-housing for driving the shaft and including a cam mounted on the shaft for controlling the valve in timed relation to operation of the dial feed.

JOHN Q. HOLMES. CALMER E. GORDON.

Images