US 3805582 A
A vertical multiple die set forging press transfer mechanism which includes a pair of main arms, one pivoted at each side of the press, transfer finger beams supported therefrom and extending on each side of the tooling, such beams being supported on bearings on the ends of smaller arms pivoted to the main arms, and individual cam drives operative to pivot the main arms to raise and lower the beams, swing the smaller arms to open and close the beams, and reciprocate the beams, to transfer work from one die set to the next, the transfer mechanism being independently driven to run continuously and cycle the forging press when the work is in proper position and the dies are clear of all of the transfer fingers.
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United States Patent [191 Logan Apr. 23, 1974 Primary Examiner-Charles W. Lanham Assistant Examiner-Robert M. Rogers Attorney, Agent, or Firm-Donnelly, Maky, Renner & Otto 5 7 ABSTRACT A vertical multiple die set forging press transfer mechanism which includes a pair of main arms, one pivoted at each side of the press, transfer finger beams supported therefrom and extending on each side of the tooling, such beams being supported on bearings on the ends of smaller arms pivoted to the main arms, and individual cam drives operative to pivot the main arms to raise and lower the beams, swing the smaller arms to open and close the beams, and reciprocate the beams, to transfer work from one die set to the next, the transfer mechanism being independently driven to run continuously and cycle the forging press when the work is in proper position and the dies are clear of all of the transfer fingers.
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WARNER C. LOGAN ATTORNEYS PATENTEDAPR 23 I974 SHrEI 2 U? 7 m vm no \1 rllallll INVENTOR. WARNER C. LOGAN ATTORNEYS PATENTEDAPRZBPSM 3805582 SHEET 3 [IF 7 INVENTOR. WARNER C. LOGAN ATTORNEYS PATENTEUAPR 23 I974 SHEET 0F 7 INVENTOR.
BY WARNER C. LUGA/V ATTORNEYS PATENTEBAPR 23 m4 SHEEI 6 UF 7 INVENTOR. WARNER C. LOGAN A TTO RNEYS PATENTED APR 23 I974 SHEET 7 [IF 7 Own qcmm
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000m QONN oovm 09M 44 OvN 09 ON Ow wQZOQum wmmo om mozoowm m-m 0*0 Dumu zoohm oom oom oON com com oon OOn OQN 09 ON 00 Own INVENTOR. WARNER c. LOGAN mxomhm Qwwu xookm umE um 202.02 new mmwzi ATTORNEYS 1 F ORGING PRESS TRANSFER MECHANISM This invention relates generally as indicated to a transfer mechanism for a forging press and more particularly to a transfer mechanism for a large forging press capable of transferring heated stock from die to die.
Examples of prior art transfer mechanisms for vertical forging presses may be seen in Kull Pat. No. 3,180,123, Sanford Pat. No. 3,079,817, Candee Pat. No. 1,426,039 and Grombka et al. Pat. No. 3,422,657. Such prior art transfer mechanisms are generally quite complex and require to extend through relatively small windows in the frame thus limiting the movement of the transfer fingers. Since a forging press provides a rather violent action with vibrations in .movement being transferred to the foundation of the press, it is possible for a transfer mechanism upon repeated usage to become misaligned. This can affect the quality of the part produced as well as excessively wear the tooling or perhaps even damage the same.
A principal object of the present invention is to provide a transfer mechanism wherein the transfer main shaft and all transfer elements related to correct alignment are attached directly to the press, thereby eliminating any possible misalignment of transfer due to possible movement of the press on its foundation.
Another principal object is the provision of a transfer mechanism wherein the transfer beams are supported on main arms pivoted directly to the sides of the press frame.
Still another object is the provision of a transfer mechanism for large forging presses of simplified construction.
Another object is the provision of ,a transfer mechanism for large forging presses which is independently driven and which will itself cycle the press when the work is in proper position and the dies are clear of all of the transfer elements.
A still further object is a transfer mechanism for a forging press wherein a slight angular movement of the main arms will elevate the transfer beams, such beams being supported on smaller arms on the main arms, with a slight angular movement of the smaller arms openingand closing the transfer beams.
Yet another object is the provision of a transfer mechanism of a simplified construction which can be utilized in connection with an automatic feed mechanism.
A still further object is the provision of a transfer mechanism wherein the work is gripped and transferred by spring loaded fingers mounted on two beams, the beams being one behind and one in front of the forging dies and extending through each lateral window of the press, all movement of the transfer beams being accomplished by a support and drive mechanism located outside of the press.
Other objects and advantages of the present invention will become apparent as the following description proceeds.
To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully described, the following description and the annexed drawings setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of a few of the various ways in which the principles of the invention may be employed.
In said annexed drawings:
FIG. 1 is a side elevation of a forging machine incorporating a transfer mechanism in accordance with the present invention;
FIG. 2 is a fragmentary front elevation-partially broken away and in section taken from the line 2-2 of FIG. 1;
FIG. 3 is a horizontal section through the press taken substantially on the line 33 of FIG. 2;
FIGS. 4 through 7 are fragmentary enlarged sections through the dies illustrating the transfer beam movements;
FIG. 8 is a side elevation on a somewhat enlarged scaleof another embodiment of the present invention;
FIG. 9 is a front elevation of the embodiment of FIG. 8 as taken from the line 9-9 thereof; and
FIG. 10 is a timing diagram for the press and transfer mechanism.
Referring first to FIGS. 1, 2 and 3, it will be seen tha the press 10 comprises a main upstanding solid onepiece steel frame 11 which includes four massive columns 12, 13,14 and 15 seen more clearly in FIG. 3. Such columns form lateral windows 16 and 17 in the frame.
A back housing 20 which includes full height integral brackets 21 and 22 is firmly attached to the main frame 11 and has journalled therebetween back shaft 23. On presses smaller than the one illustrated, the back housing 20 may be formed integrally with the main frame 11 as a single casting.
On the end of the back shaft facing the viewer in FIG. 1 is mounted a flywheel 2,4 driven by a plurality of V- belts 25 from the drive sheave 26 of motor 27. The motor 27 is mounted on adjustable hinged motor bracket 28. I
On the opposite end of the back shaft 23, the side furthest from the viewer in FIG. 1, a pinion 30 drives bull gear 31 which is connected to eccentric shaft 32 through a direct acting air clutch 33. On the end of the main eccentric shaft 32 facing the viewer in FIG. 1 is a multiple link shoe brake 35 which is released by direct acting air cylinder 36 and set by relatively large spring 37.
As seen in FIG. 2, the main eccentric shaft is .connected to ram 38 by pitman 39. The main ram body which carries the top bolster for the top dies and the pitman wrist pin connection, is guided by suitable liners and gibs indicated at 40 held in place by suitable large cap screws 41.
Referring momentarily to FIG. 7, it will be seen that the top dies 43 may be secured in place by bolster 44 with a cross wedge 45 being provided for die adjustment. The lower dies 46 aresecured to the die seats of the main frame by bolster 47 .which is secured in place :by hold-down bolts 48. A bottom wedge 49 is provided for die adjustment. A knockout in the ram is actuated from the pitman while bottom knockout pins 50and 51 are actuated by a cam on the main eccentric shaft through conventional rods and levers, not shown.
As seen in FIG. 2, there may be four sets of dies as indicated at 53, 54, 55 and 56, respectively. Such die sets may betermed bust, block, finish, and trim, respectively. As the work or stock will normally move through the press from left to right as seen in FIG. 2 and for transfer purposes, there is provided an entrance or pick-up station 57 and an exit or flash drop station 58.
A horizontally extending stock'feed arm 60 mounted on parallel levers 61 and 62 supports a heated billet or like stock on the end thereof as indicated at 63. When the stock feed advances by the swinging of the levers 61 and 62, the billet is moved to the'pick-up station 57 to be moved through the press by the transfer mechanism. The feed mechanism is disclosed and claimed in applicants copending application, filed even date herewith, entitled Forging Press Feed Mechanism and Method.
Tl-IE TRANSFER MECHANISM Referring initially to FIG. 3, it will be seen that the transfer mechanism comprises beams and 71 which are positioned fore and aft, respectively, of the forging dies. Such beams each include longitudinal extensions 72 and 73 connected to the main or center portion of the beams by joints as indicated at 74 and 75, respectively. Secured to the tops of the transfer beams 70 and 71 are inwardly directed sets of transfer fingers as seen at 77 and 78. As indicated in FIG. 3, there are five sets of opposed transfer fingers mounted on the beams and it will be noted that the configuration of the fingers may change from left to right since the shape of the billet 63 will be changing as the result of the forging operation.
7 The transfer beams 70 and 71 extend through the lateral windows 16 and 17 in the press frame and are supported outside of the window 16 in the distal ends of relatively short levers or arms 80 and 81 which are pivoted to longer arm 82 as indicated at 83 and 84, respectively.
The other end of the beams 70 and 71 extends through the window 17 in the press frame and such beams are supported in the distal ends of relatively short levers or'arms 85 and 86 which are pivotally connected to the longer arm 87. The .levers 85 and 86 are right and left hand duplicates in form to the levers 80 and 81, respectively, and are mounted on their respective longer main arms in the same manner. Each lever is fairly wide at its distal end, twenty inches in the illustrated embodiment, properly to support the beams, and is bifurcated at its upper endfor the pivotal connection to the longer beam and for the sliding connection between the levers of each pair. The bifurcation of the rear levers 80 and 85 supports a stop bar 88 adapted to engage the nose of adjustable stop screws 89 mounted on the tops of the main arms 82 and 87. These stops set up the grip location for the transfer fingers in that the beams cannot move any closer together than the set stop. I
The bifurcation of such rear levers also provides a connection 90 for air springs 91 which are also connected to the top of the main levers 82 and 87 as indicated at 92. The connection between the levers of each pair is provided by pin 93. Such pins are pivoted in bushings 94 in the front levers and are provided with an adjacent square section 95 riding in bronze ways 96 secured in slots 97 in the rear levers. The front levers of each pair are provided with forwardly projecting arms 98 on the outside of the main levers 82 and 87. These arms are connected to adjustable push rods or links 100 at 101, the opposite end of the links being connected at 102 to levers 103 pivoted at104. Such levers include a bifurcated portion supporting cam follower 105.
The transferbeams are supported in the distal ends of the shorter levers for horizontal reciprocation and are mounted on antifriction bearing rollers on the bottom and the outer sides as indicated at and 11 1, respectively, to support the grip loads. Bronze wear plates are employed at the top'and the inner sides as indicated at 112 and 113, respectively, for ease of maintaining proper clearance. Bellows type dirt shields may be fastened to the beams and levers to eliminate dirt in these sliding areas.
Vertical. movement of the beams 70 and 71 is obtained from the two long substantially horizontal levers 82 and 87 which are pivoted coaxially, one at each side of the press near the rear thereof as indicated at 115 and 116. Such levers extend in somewhat arcuate form toward the front of the press and the front or distal end of each lever is connected at 117 to adjustable rod 118, the ,lower end of which is bifurcated, supporting cam follower 119. A pivot lever 120 is pivoted at 104 and is clevis connected'to the lower end of the push rod 118 to maintain the cam follower in the proper position.
As seen in FIGS. 2 and 3, transfer movement of the beams is obtained by a lever 122 which is intermediately pivoted at 123, the pivot shaft of. the lever being journalled in pillow blocks 124 and 125 mounted on the top of stand 126. The stand includes a pair of extensions 127 to which the blind end of pneumatic air spring 128 is connected at 129. The rod of the air spring is connected to the lower end of the lever 122 urging the cam follower 130 supported thereby against transfer cam 131. The top of the lever 122 is provided with a bracket 133 extending symmetrically on each side thereof and links 134 and 135 at each end of the bracket connect such bracket to the transfer beams 70 and 71, respectively, through self-aligning ball joints indicated at 136, to accommodate the different move ments.
The drive for the various cams operating the transfer mechanism is obtained from a gear motor unit 137 whichincludes a rotary cam limit switch operative at the conclusion of a transfer cycle when the stock is in proper position and all of the transfer elements are clear of the dies to cycle the forging press. The output of the gear motor unit is connected to main cam shaft 138 which is journalled in suitable bearings 139 and 140 secured to the front of the press. The first cam on the shaft 138 is grip cam 141 operating the follower 105 opening and closing the relatively short levers 80 and 81. The second cam 142 operates the follower 1 19 pivoting the main lever 82 to raise and lower the transfer beams. Cam 143 is the same profile as the cam 142 raising and lowering the main lever 87 while the cam 144 is the same profile as the cam 141 operating the arms 85 and 86 in unison with the arms 80 and 81. The transfer cam 131 is operated from the cam shaft 138 through the miter gear box 145. A chain transmission or take off 146 operates cam 147 through miter gear box 148, such cam 147 oscillating the arm 61 to move the feed arm 60 in synchronism with the transfer mechanism.
It is noted that the cam followers 105 are held on the cams 141 and 144 by the air cylinders 91. The opening motion of the fingers is produced by cam rise while the gripping motion is produced by cam fall obtained by the pressure of such air cylinders. This arrangement provides maximum safety by providing cam operated or positive opening of the fingers and cam control but air cylinder grip of the forgings. The same safety feature is true of the transfer action since the air cylinder 128 is holding the cam follower 130 on the cam 131. The direct action of the cam moves the transfer beams from right to left as seen in FIG. 2 while the action of the air cylinder 128 holding the follower 130 on the cam moves the transfer beams from left to right when the beams are transferring forgings. This provides optimum safety during transfer. The cam followers 119 are maintained on the cams 142 and 143 solely by the weight of the main levers 82 and 87.
THE EMBODIMENT OF FIGS. 8 AND 9 In the embodiment illustrated in FIGS. 8 and 9, the main operating levers or arms 150 and 151 are mounted for pivoting movement on the front of the press frame 11. Each arm is secured to a hollow stub shaft as indicated at 152 and 153, respectively", which are journalled in pillow blocks 154 and 155. Secured to such shafts are arms 156 and 157, on the distal ends of which are mounted cam followers 158 and 159.
Extending through such hollow shafts 152 and 153 are smaller shafts 160 and 161 which are additionally journalled in pillow blocks 162 and 163. Secured to the inner end of such shafts are arms 164 and 165, on the distal ends of which are mounted cam followers 166 and 167. The outer ends of such shafts have secured thereto arms 168 and 169. These arms are connected through links 170 to extensions 171 on the forward relatively shorter levers 172 which are pivoted on the main operating arms as indicated at 173. The forward levers 172 are connected to the aft levers 174 by segment gears indicated at 175 and 176 so that as the forward levers pivot in a counter-clockwise direction as viewed in FIG. 8, the aft levers pivot simultaneously in a clockwise direction'about the pivot 177 and vice versa. The transfer beams 178 and 179 are mounted for reciprocation in the distal ends of the shorter levers 172 and 174 in the same manner that the beams 70 and 71 are mounted in the FIG. 3 embodiment.
The main cam shaft 180 is also mounted on the front of the press and is driven from sprocket 181 from a similar gear motor drive as in the preferred embodiment. The cam shaft is journalled in pillow blocks 1'82, 183, 184 and 185, all firmly secured to the front of the press. The cam 186 engages the cam follower 159 while the cam 187 engages the cam follower 167. Cam 188 engages cam follower 166 while cam 189 engages cam follower 158.
In this embodiment, as in the preferred embodiment, the main arms extend near the tops of the windows in the sides of the press with the beams being positioned fore and aft of the dies. In this embodiment, the weight of the arms maintains the followers in engagement with the earns. he ams 18.6'a'nd 189 raising and lowering the arms 150 and 151 while the cams 188 and 187 function to open and close the grip fingers. Thetransfer beams may be shifted for transfer in the same or similar manner as in the preferred embodiment.
OPERATION Referring now to FIGS. 4 through 7 and 10, andfirst to FIG. 10, there is illustrated a timing diagram.illustrating the operation of the press, the beam transfer mechanism and thestock feed mechanism. The press and stock transfer mechanism operate through two cycles while the feed mechanism operates through but a single cycle. Accordingly there will be a workpiece in every other station seen in FIG. 2. When using heated stock this prevents the dies from overheating. At the beginning of the cycle, the transfer mechanism will actuate the press and the press will proceed through its stroke as indicated by the curve 200. Simultaneously the beams, open and empty, are returning as indicated by the curve 201. When the horizontal retraction transfer is complete, the fingers then close as indicated by the curve 202. The closing action of the fingers commences after the press has completed slightly more than half of its opening stroke. Just prior to the completion of the grip action as indicated by the curve 202, the beams commence their elevation as indicated by the curve 203. At this point in the cycle, the fingers closing on the pick-up station will pickup nothing since the feed mechanism has retracted to receive a hot billet. Immediately upon completion of the beam elevation, as indicated by the curve 203, horizontal transfer commences as indicated by the curve 204. Also at this time, the feed mechanism commences its extension stroke as indicated by the curve 205 to position a hot billet in the pick-up station. Upon completion of the horizontal transfer forward stroke 204, the beams are lowered as indicated by the curve 206 and upon completion of that stroke, the fingers open as indicated by the curve 207. V A
At this point, with the transfer fingers clear of the dies, the press is again cycled as indicated by the curve 208. Simultaneously, the beams are horizontally retracted as indicated by the'curve 201A. The transfer cycle is, of course, repeated as indicated by the curves 201A through 204A, 206A and 207A. This time, as the fingers close during the curve 202A, the fingers atthe pick-up station will pickup a hot billet since the feed mechanism has positioned a hot billet at the pick-up station. As soon as the elevation stroke of the beams is completed as indicated by the curve 203A, the feed mechanism begins to retract as indicated by the curve 209.
With reference to FIG. 4, .the transfer beams and 71 are moving in to the grip position (curve 202 or 202A) and it is noted that the forging F has been elevated approximately three-fourths of an inch by the bottom knockout pins 50,and 51. In FIG. 5, the transfer beams are at the grip position. In FIG. ,6, the transfer beams have been elevated and are moving the forging F .to the next die station clear of the lower die 46. In FIG. 7, the transfer beams have .lowered .to place the forging F on the next die and have retracted through the curve 207 of FIG. 10,.the press having been cycled with the press ram at .the bottom of its stroke, the beams now returning for the next transfer action.
It is now believed apparent that there is provided a forging machine transfer mechanism which can run continuously and cycle the forging press when the stock isin proper position and the dies are clear of all of the transfer elements. All the movements of the transfer beams are accomplished by a mechanism located outside the press with thebeams, one behind and one'infront of the forging dies, extending horizontally through each window of the press.
The opening and closingmovements of the transfer .beams are produced by twocooperatingrpairs of levers,
one pair at each side of the vpress. These, levers are pivoted in .the area outside and nearthe top of the press windows and slight angular movement of these levers produces the opening and closing motions of the transfer beams. The pivot points of the levers are selected so that the portion of the movement where the fingers are in contact with the 'forgings is an arc quite nearly parallel to the horizontal plane of the fingers and forging. The opening motion of the fingers obtained by these pairs of levers is produced by cam rise'while the gripping motion by cam fall with'the cam followers being held on the cams by the air cylinders 91 in the preferred embodiment.
Vertical movement of the, transfer fingers is obtained by the two longer main horizontal levers or arms mounted one on each side of the press. These levers are pivoted at the rear of the press in the preferred embodiment or at the front of the press in the alternative embodiment and extend near the tops of the windows properly 'to position the transfer fingers. In the preferred embodiment, the angular movement of the main levers required to raise the forging say approximately 1 9% inches for transfer is approximately 1 ii.
For horizontal transfer action, the lever and air cylinder employed are arranged to provide positive cam action for return of the transfer beams when empty and cam-controlled air pressure action for transfer of the forgings. This provides maximum safety during the transfer.
. The transfer mechanism is independently driven and by the noted synchronism actuates the press at the proper point in the transfer cycle. The transfer mechanism, of course, can be cycled without running the press motor. The main cam shaft 138 as well as the pivots 116 which control correct alignment of the transfer beams are attached directly to the press thereby eliminating any misalignment of transfer due to possible.
movement of the press on its foundation.
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
l. A transfer mechanism for a vertical forging press comprising a pair of pivot arms at each side of said press, a transfer beam supported by the distal ends of opposed arms of each pairfor longitudinal reciprocatin'g movement. said transfer. beams extending through the press, one for and one aftof the dies, means oppositely to pivot the arms of each pair to open and close said beams, means to reciprocate each beam simultaneously to obtain transfer, and means supporting said pair of pivot arms externally of the press for vertical movement, said last mentioned means comprising a pair of relatively long levers, one'of said pair being pivoted coaxially at each side of the press.
2. A transfer mechanism as set forth in claim 1 wherein said levers are pivoted to the press frame at the back thereof, and cam means mounted on the front of the press operative to raise and lower the distal ends of said levers.
3. A transfer mechanism as set forth in claim I wherein said pivot levers are pivoted to one end of the press and are actuated by cams mounted on the other end of the press.
4. A transfer mechanism as set forth in claim 1 wherein said pivot levers are pivoted coaxially one to each side of the press at the front thereof, and cam means mounted on the front of the pressoperative to pivot said levers to raise and lower said'beam's.
5. A transfer mechanism as set forth in' claim 1 I wherein said pivot levers are mountedffori pivotal movement on the front of the press and extend over windows in the sides of the press, the pairs of pivot arms being pendently supported from said levers.
6. A transfer mechanism as set forth in claim 5 ineluding an offset arm secured to each pivot lever, a cam follower on said arm, and cams mounted on the front of the press operative to engage said cam followers.
7. A transfer mechanism as set forth in claim 6 including a link connected to one arm of each pair of pivot arms, and cam means operative to shift said link to open and close said transfer beams.
8. A transfer mechanism as set forth in claim 7 wherein said link is connected to a crank having axially offset arms, said crank extending coaxially through the pivot of said pivot levers.
9. A transfer mechanism as set forth in claim 8 including segment gears interconnecting each pair of pivot arms operative to obtain countrarotative movement thereof.
10. A transfer mechanism for a vertical forging press comprising a pair of main levers, one pivoted to each side of the press, transfer beams supported on said levers andextending through said press, means operative to openand close said beams, and means to pivot said levers to raise and lower'said beams.
11. A transfer mechanism as set forth in claim 10 wherein said main levers are pivoted coaxiaily at the rear of the press, and cam means mounted on the front of the press operative to pivot said main levers to raise and lower said beams.
12. A transfer mechanism as set forth in claim 11 wherein said cam means are mounted on said press near the bottom thereof, cam followers riding on said cam means, and adjustable push rods interconnecting said cam followers and the distal ends of said pair of main levers, the weight of said levers holding said followers on said cam means.
13. A transfer mechanism as set forth in claim 12 wherein said cam means comprises a common power driven shaft mounted on said press, a plurality of cams on such shaft, one cam at each side of said press being operative to pivot said main levers.
14. A transfer mechanism as set forth in claim 13 including cams on each sideof said press operative to open and close said beams, said cams acting against an air spring to open said beams, the latter providing the grip as the beams close in the manner controlled by said cams.
15. A transfer mechanism as set forth in claim 10 including a relatively shorter pair of levers, one pair being pivoted to each main lever, said transfer beams being supported in the distal ends of said shorter levers.
16. A transfer mechanism as set forth in claim 15 wherein said shorter levers are interconnected to pivot in opposite directions.
17. A transfer mechanism as set forth in claim 16 including cam means mounted on said press operative to pivot said shorter levers to open and close said beams.
18. A transfer mechanism as set forth in claim 17 including cam means operative to reciprocate said beams.
19. A stock transfer mechanism for a vertical forging press including a pair of main arms, one on each side of the press, each main arm being pivoted to the side of the press frame and extending over lateral windows in such frame, a pair of shorter arms pivoted to each main arm, beams supported on and extending between the distal ends of the opposed arms of each pair of shorter arms, means to raise said main arms to elevate said beams, and means oppositely to pivot said shorter arms to open and close said beams.
20. A stock transfer mechanism as set forth in claim 19 wherein said means to raise said main arms to elevate said beams comprises a cam mounted on said press frame.
21. A stock transfer mechanism as set forth in claim 20 including a follower on said cam, and an adjustable link interconnecting the distal ends of said main arms and said cam follower, the weight of said main arms maintaining said cam follower on said cam.
22. A stock transfer mechanism as set forth in claim 19 wherein said means oppositely to pivot said shorter arms to open and close such beams comprises a cam mounted on said press frame, said cam acting against an air spring to open said beams, said air spring providing the grip pressure to close said beams as controlled by said cam.
23. A stock transfer mechanism as set forth in claim 19 wherein said beams are mounted in the distal ends of saidshorter arms for longitudinal reciprocation, and cam means operative to reciprocate said beams in synchronism with the opening, closing and elevation thereof.
24. A stock transfer mechanism as set forth in claim 23 including a follower on said cam means, said follower being mounted on an intermediately pivoted lever, and air spring means holding said follower on said cam means, the opposite end of said lever from said follower being connected to said beams whereby the direct action of said cam means moves the beams in one direction while the air spring means as controlled by said cam means moves the beams in the opposite direction.
25. A stock transfer mechanism as set forth in claim 19 wherein the arms of each pair of shorter arms are interconnected for contrarotative movement, an adjustable stop being provided on one arm operative to control the extent of closing thereof.
26. A transfer mechanism for a vertical forging machine comprising beams, one fore and one aft the dies, means to open and close the beams, means longitudinally to reciprocate the beams, and an arm pivoted to the side of the press frame on an axis generally parallel to said beams providing said beams for vertical movement in response to pivoting of said arm.
27. A transfer mechanism as set forth in claim 26 including a pair of arms, one arm being coaxially pivoted to each side of said press frame, said beams being supported between said arms.
28. A transfer mechanism as set forth in claim 27 including a pair of levers on each arm supporting said beams, said means to open and close said beams comprising a cam drive mounted on said press frame.
29. A transfer mechanism as set forth in claim 27 including cam means mounted on said press frame operative to pivot said arms.
30. A vertical forging machine transfer mechanism comprising an arm pivoted to the side of the press frame and extending generally horizontally over a window in-the press frame, a pair of levers pivoted to said arm, means interconnecting said levers to cause the same to pivot in opposite directions, a transfer beam supported at the distal end of each lever and extending through the window in the press frame, one beam on each side of the tooling, means to pivot said arm to raise and lower said beams, and means to pivot said levers to open and close said beams.
31. A vertical forging machine transfer mechanism as set forth in claim 30 wherein said last two mentioned means comprise a cam shaft with cams thereon, said shaft being journalled on said press frame.
32. A transfer mechanism for a vertical forging press comprising a pair of pivot arms at each side of said press, a transfer beam supported by the distal ends of opposed arms of each pair for longitudinal reciprocating movement, said transfer beams extending through the press, one for and one aft of the dies, means oppositely to pivot the arms of each pair to open and close said beams, means to reciprocate each beam simultaneously to obtain transfer, and means above said pair of pivot arms pendently supporting the same externally of the press for vertical movement.
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