US1768503A - Drawing press - Google Patents

Description

June 24, 19,30. A. A. BYERLEIN DRAWING PRESS' Filed Dec.v 21, 1927 7 sheets-sheet M7 f/M June 24, 1930. A. A. BYERLEIN 1,758,503

l DRAWING PRESS Filed Dec. 21, 1927 7 Sheets-Sheet 2 T-1g.A E IVENTOR.

Mafw fm l ATTORNEYS.

June`24, l93u`. A. A. BYERLEIN v I 1,768,503

' DRAWING PRESS Filed lieb. 21, 1927 7 sheets-sheet s A TTORNEYS.

5mm@ l, M3@ A. A. BYERLEEN 39?@3395533 DRAWING PRESS Filed Deo. l21, 192'? 7 sheets-sheet 5 HIM" 4 mi 1,1' liv vu ATTORNEYS.

@Bum 24 w3@ A. A. BYERLEBN .DRAWING PRES S Filed Deo. 2l, 1927 '7 Sheets-Sheet INVENTOR.

BY z .A

ATTORNEYS.

m@ 249 w3@ A; A. BYERLEEN' @www DRAWING PRES S Filed Dec'. 2l, 1927 '7 Sheets-Sheet 7 atented .lune 24, i930 VNITED STATES PATENT. OFFICE ART'HUR A. BYERLEIN, OF DETROIT, MICHIGLAN,

T GENERAL MACHINERY CORPORATION, OF HAMILTON,

0F DELAWARE Application led December 21, 1927. Serial No. 241,514.7.

This invention relates to presses and particularly to that type of press used in drawing metal.

One of the principal objects of the present invention is to provide a press of this character having a plurality of blank holders, one of which is operable as a drawing member, both blank holders being operated by mechanism which is located at the same side of the press-bed. Y

Another object of thev invention is the provision of a drawing press having three side members mounted one within the other, all movable toward the workv or blank in the 5 same direction, at least one of the slide members being operable with adwell in its movement so as to serve as a blank holder.

A further object of the invention is theprovision of a press having two plungers operable toward the work or blank from opposite -sides thereof, rotatable operating shafts being provided at opposite sides of the pressbed for driving the two plungers.

Still another object is the provision of a press having three relatively movable slide members operably connected to a common crank-shaft, with the operating connections all at the same side ,ofthe press-bed.

Other objects and advantages of the invention will be apparent from the following description and the accompanying drawings in which- Fig. 1 is a side elevation of a drawing press embodying the present invention;

Fig. 2 is a front elevation thereof showing the portion of the press above the press-bed;

Fig. 3 is a front elevation of the press, partly in vertical section, showing the portion of the press below the press-bed;

Fig. 4 isa side elevation showing the portion of the press below the press-bed partlyin section;

. Fig. 5 is a central section on the line 5-5 of Fig. 2 showing the actuating mechanism for the outside blank holder with the latter in its lowered position;

Fig. 6 is a section on the line 6 6 of Fig. 5; Fig..7 is a section on the line 7 .-7 of Fig. 6;

Fig, 8 is a section on the line 878 of-Fig.5;

DRAWING PRESS AssIeNoR, RY MESNE ASSIGNMENTS, oro, .a CORPORATION Bassum certain linkages;

Fig. 11 is a diagrammatic showing of the travel of the various slide lmembers of the press;

Fig. press;

Fig. 13 is a bottom plan `view of the three slide members of the press;

Fig. 14 is a horizontal section on the line' 14-14 of Fig. 1 through the end of one of the rock-shafts of the press; and

F ig." 15 is a section on the line 15-15 of Fim 14.

efrring to the 'figures more particu-l larly by reference numerals 10 designates the frame of the press which comprises a bedll, spaced apart uprights or side frames 12 carrying the actuating mechanism and guid ing the outer blank holder for vertical recprocatory movement, and an arch member 13 which interconnects the two side frames. The outside blank holder 14 is guided upon guides 15 upon the side frames 12 of the press. v

Means for reciprocating the outside blank holder 14 in its guides 15 comprises'a toggle mechanism Iconsisting of front and rear toggle rock-shafts 2O and 21 extending transversely of the press and journaled in bearings 22 at the ends of the rock-shafts and -al- 12 is a plan view of the bed of the Figs. 9 and 1() are diagrammatic views of ditional bearings 23 provided in the two derotation of the rock- shafts 20 and 21 in opposite directions results in either raising or lowering the blank holder 14 4and since all the corresponding parts move simultaneously Vand through equal distances the blank holder is raised or lowered, without tilting or bincl' ing, and an even pressure is obtained upon the work or blank when this blank holder is in the lowered position.

The rock-shafts and 21 are actuated from a rotatable actuating shaft or crankshaft journaled in the side frames and extending transversely of the press and centrally positioned between the rock-shafts and situated in the central vertical plane of the press. Such actuating mechanism includes as one of its principal elements a slide-actuating member 31 which is connected with the rockshafts 20 and 21 to actuate the same, and which is itself actuated from the crank-shaft 30. The slide-actuating member 31 is supported between the rock-shafts 2O and 21 within a slide housing 32 which 'guides the slide-actuating member for reciprocatory movement along an obliquely disposed line extending from front tb rear of the press, the line of movement passing above the front rock-shaft 20 and below the rear rock-shaft 21, the normal distances between the line of movement and the two rock-shafts being equal. This arrangement 'is best illustrated in Fig. 5. The slide housing 32 is an elongated tubular member preferably of rectangular cross-section and is rigidly secured to the arch member 13 of the press which is cast with an obliquely disposed opening 33 in the mid plane of the press to receive the slide housing 32.

Referring particularly to Figs. 5 to 10, the crank-shaft 30 is provided with a crank 35, preferably in the mid plane of the press, which crank is connected by a connecting rod 36 with a segmental shaped rock lever 37 pivotally mounted upon pin 38 which is fixed in a lug 39 forming a part of the arch of the res's frame. Rocking lever 37 is connected ly a link 40 to a second rocking lever 41 which is mounted-'on pin 42 which, like pin 38, isimmovably fixed in the part 39 of the arch. The rocking lever 41 is pivotally connected at its other end with a link 43 which is connected to the pin 45 of the bifurcated rocking lever 41. The other end of link 43 is rotatably connected to the center of a pin 50 which in turn is keyed to a bifurcated link 57. Link 57 connects through link-pin 58 with the rear end of the slide-actuating member 31. t 4

The motion is transmitted from the slideactuating member 31 to the rear toggle rockshaft 21 through the following connections. The pin 58, which is fixed in the member 31, carries the ends of two links 59 which are bent so as to enclose the outer end portions of the pin 50. Instead of engaging the pin 50 directly, however, the links 59 are connected through bushings 61 which are rotatable in the forked arms 55 of the toggle rocki shaft 21. The ends of the link-pin 50 are provided with a pair of flat parallel surfaces 51 adapted to bereceived between cooperating mesures parallel flat surfaces 53 upon the interior of bushings 61. The bushings are constructed t0 have a close sliding it with the surfaces of the link-pin 50 and some little clearance space is provided at 54 to permit some relative motion of the pin and bushing at right angles to the axis of the pin. Since the pin is keyed to the link 57 with the flat surfaces 51 parallel to the longitudinal axis of that link, it is apparent that the bushings are constrained to movement upon pin 50 in a direction parallel with the longitudinal axis of the link 57. rlhe rear end of thelslide-actuating member 31 is thus connected with the toggle rock-shaft 21 through links 59, bushings 61, and arms 55, and because of the sliding connection between the pin 50 and bushings 61 there is a certain independence of movement between the main linkage which drives Jthe slide-actuating member 31, and the linktuating member 31 from the crank-shaft 30 is shown by the sectioned parts, and the linkage foractuating the rock-shaft 21 from the slide-actuating member is shown in outline. 1t is evident from these figures andj from Figs. 6, 7 and 8 that the link-pin 50 is free to slide in the bushing 61 and to take a position therein depending upon the running clearance which may vary from time to time with the varying stresses and wear of the various parts.

The forward end of the slide-actuating member 31 is connected with the front rockshaft 2O to drive the latter by a mechanism which consists of a link-pin 47 carried by the slide-actuating member and a link 48 pi voted thereon and pivotally connected at its other end with link-pin' 49 carried upon the outer end of the forked arm 63 extending from and rigid with the front rock-shaft 20.

The linkage between the slide-actuating member 31 and each of the toggle rock- shafts 20 and 21 is such that the latter are actuated through equalangular distances thereby effecting parallel raising and lowering movement ofthe blank holder 14 through its operation, and securing even pressure of the blank holder upon the work. The power is transmitted through the toggle connections productive of a suspended dwell in the movef ments of the slide-actuating member 31 from the crank-shaft 30, and the power divides equally at the slide-actuating member and is transmitted through the two equal systems of transmission to the two toggle rock-shafts 2O and 21 which are thus actuated with a considerable dwell in their movements. The

' power is then transmitted from the two rockshafts to opposite sides of the blank holder 14 and the blank holder is thus caused to reciprocate with a dwell of, say, 130, as shown by curve A of Fig. 11. The power transmission for actuating the blank holder 14 is symmetrical with respect to the center of the press and from the center of the crank-shaft, and objectionable vibrations and unbalanced strains on the press parts are thus obviated.

The crank-shaft 30, as previously mentioned is mounted in bearings in the side fframe members 12 and is also rotatably mounted in auxiliary bearings 66 and 67 in the walls 24. Between the two bearings 66 and 67 and the bearings in the frame portions 12 and equidistantly spaced from the center of the crankshaft 30 are crank-arms 68 and 69 which are connected at their ends to two connecting rods 70, which are pivoted at their lower ends to the central portions of an inner slide member or plunger 72, the connecting rods being provided with the usual length-adjusting devices customarily emploved in plunger connefctions. This plunger 72 is guided for vertical reciprocatory movement within an intermediate die slide member 74 which in turn is' guided within the outside blank holder 14, as shown in Fig. 13. The intermediate slide member 74, which is operable as a blank holder and also as a drawing die slide,'is connected at its four corners to links 75 the upper ends of which are pivotally connected to arms 76 which as shown are positioned closer to the center of the framethan the toggle links 27, by which the outside blank holder is operated. The arms 76 together with the links 75 form toggles, the arms 7 6 being iiXedto stub rock-shafts 78. The rock-shafts 78 aire journaled freely in the outer end of the tfoggle rock- shafts 20 and 21. As shown more cl'learly in Fig. 14 the toggle rock- shafts 20 and 21 are hollow at their ends so` as t'o rotatably 'mount the stub-shafts 78 concentrically therewith. The hub portion 81 of each toggle arm 76 is received in a socket portion 82 provided on the outer portion of each toggle rock- shaft 20, 21, and the short rockshafts 78 are thus prevented from moving 'endwise within the maintoggle rock-shafts.

The ,socket portions 82 as showny in Fig. 15

. extend the greater portion of the way around the main rock-shafts'20 and 21, but one sidel of the socket 82 is open to permit relative ro' tational movement of the toggle arm 81 and the transmission of power from the rockshaft 78 to the toggle connection to the intermediate slide member 74. Although both the toggle rock- shafts 20, 21 and the short rock-shafts 78 are rocked back and forth through a considerable angle, nevertheless, as both the main toggle rock- shafts 20, 21

and the additional short shafts 78 operate in the same direction at the same time through at least part of their movement in moving both the intermediate slide member 74 and the outside blank holder 14 Idownwardly or upwardly, the socket members 82- may extend throughout av major portion of the circumferential extent of thev main rockshafts 20, 21. At the outer end of each short rock-shaft 78 is an arm 84 which is pivotally connected to a link 85 which in turn is piv-4 oted on pin'86 provided in a slide 87 provided at one side of the press, a corresponding slide 88 being provided at the opposite side of thepress. The two slides 87 fand 88 are vertically guided for reciprocatory movement in the slide guides 89 and 90 located at the upper side portions of the press and in the middle plane of the press in a forward and rearward direction. Fach of these slides is pivotally connected by means of a pin 91 to a connecting rod 92 which is pivoted at its lower end on pin 93 rovided at the end of a crank-arm 94 on t e main crankshaft 30 at the outer end thereof, it being understood that the power transmissions at both ends of the crank-shaft 30 to the two slides 87 and 88 are similar in their construe tion and symmetrically arranged on the press. .The four short stub-shafts 78 thus reciprocate the intermediate slide member 74 with a considerable dwell in its movement due to the toggle connections between the short shafts 78 and the slide 74 and, also due iplunger or inner slide member 72 has a m0- tion which is indicated by the curve C. From Fig. 11 it is apparent that in the operation of the machine, the outside blank holder 14 first move downwardly and then dwells in its movement. At the start of dwell in the movement of the outside blank holder, indicated by reference numeral 97 of'curve A, the in- 'termedi ate slide member 74 continues to move downwardly and completes its travel` to its down position through, the space 98 during which operation the die carried by this intermediate slide member operates as a drawing die to4 thus complete a first drawing operation on the metal before. this intermediate slide member pauses at the point 99in its downward movement and dwells.. At the start 0f dwell of the, intermediate slide member 74 the plunger 7 2'is moving downwardly and theplungerjcompletes its move. ment through the space 100 and unches or draws the metal or blank whi e moving through this distance.' During the effective:

operation of the plunger the intermediate slide member may serve as a blank holder, as it remains in engagement with the work and does not move upwardly to release the work until after the plunger has started to move away from the work, this oint bein indicated at 101 on'curve C. lfter the p unger die has started to move away from the work the inner slide member and the outside blank holder reach the ends of their dwells and also are disengaged from the work. By reason of a construction such as this large stampings may be in a single complete operation to provide an opening or a doubledraw in the metal, without necessitating the removal of the blank after one operation and again positioning the stamped metal in a second press to complete a second drawing or stamping operation on the partially formed work.'

The transmission of power from the crankshaft 30 to the plunger, the` intermediate slide member 74 and the outer slide member 14 is symmetrical with respect to the center of the crank-shaft. The power is preferably supplied to the crank-shaft by means of two gears 104 and 105 which are fixed to the crank-shaft 30 adjacent its ends and just inside of the crank-arms 94, The two gears 104 and 105 are driven through pinions 106, one provided at each end of a transverse driveshaft 107 which .is in turn fixed to a driving gear 108. Gear 108 meshes with a pinion 109 fixed on shaft 110extending across the pres/s which also carries a wheel 111. `This wheel 111 is driven by a belt 112 operated by means of a motor 113 provided on a bracket 114 which is fastened rigidly in place to an upper portion of the press. The bearingsv for the shafts 107 and 110 are provided in a bracket 115 which is attached rigidly'in place to one sideof the press frame. 1

The power-transmitting shaft 110 in addition to carrying the drive pinion'109 and wheel 111 is also rigidly attached to and drives a beveled drive-gear 118. Engaging i the bevel gear 118 is a driven bevel gear 119 provided at the upper end of an upwardly extending shaft 120 at the rear'side portion of the press. The shaft 120 is mounted at its upper end in a bearing 121 which is fixed to the press frame. The lower end of the shaft 120 is mounted in a bearing 123 provided in a boxor case 124 at one side of the press near the bed. Rigidly connected to the lower end of the shaft 120 is a beveled gear-125 which engages with a beveled gear 126 carried by shaft 127 journaled for rotationin bearings 128 provided at the rear of the press as shown. This shaft 127 is also provided with' a drive spur-gear or pinion 129 which engages spur-gear 130 fixed on the transverse shaft 131 iournaled at its ends in bearings 132. Shaft 131 carries a pinion 133 which gears with the large spur-gear 134 provided atqone side of the press onda main tion 141.

trally below the crank-shaft 30 at the upper end of the press. Between the bearings on each side of the crank-shaft the latter is provided with crank-arms 147 pivotally connected to connecting rods 142 which in turn are pivotally connected by pins 143 to a'bottom slide member or plunger 144. The connecting rods 142 are formed of telescopicsections '.145 and 146 so that their lengths may be adj usted to adjust the limits of movement of the bottom plunger 144, such an arrangement being similar to the length adjusting connection by r means of which the upper plunger 7 2 is operably connected to the crankshaft 30.

Slidably mounted in the bed 11 of the press and suitably guided therein is a stri-pper slide 150 thisslide being in the form of a hollow shell or box open atthe lower end and guided for vertical reciprocatory motion. This slide 150 guides the plunger 144 as by means of the guide ways 151 provided in the slide 150 which extend into corresponding guide slots in the plunger. '.The vlower portion of the stripper slide 150 is provided at its fourcorners with the outstanding brackets 154 each of which is fastened to the upper end of a piston-rod 155. In the positions shown in Figs. 3 and 4, the stripper slide 150 and the lpiston-rods 155are at their upper limits of tached at their front and rear portionsto the front and rear sides of the stripper slide 150. The cross-plates 158 move between strength members 160 extending from front to rear of vthe press and removably supported at their ends at front and rear portions of the pressbed in a rigid manner. The top sides of these strength me1nbers`160 support the heavy bolster-plate 162 which may be rigidly attached to the press-bed, overlying the front `and rear sides 163 and 164 of the press-bed.l

The plunger 144 is provided with forwardly and rearwardly extending recesses or slots in which the strength members 160 may be Je..V

ceived, and the uppermost limit of movement of the plunger 144 is such as tov just clear the lower sides of the beams 160. The lower ends of the beams 160 act as bumpers tolimit the upward movement of the stripper slide 150, pins 161 being provided between the beams 160 and the recessedportion of the stripper slide inwhich the beams 160 are received.

The plunger 144 may be operably connected to a plunger die as by means of vertical pins projecting down through holes in the bolsterplate 162 and through the cross-plates 158 of the stripper slide. rlhe plunger thus 'vertically reciprocates the plunger die by means. of these pins just mentioned. Outside of the plunger-die, a stripper plate,'shown in dotted lines in Fig. 3 at 165 may be employed to engage the lower side of the work or blank and cooperate with upper slide or slides ina drawing operation or for the removal yor disengagement of the work after it has been .formed This stripper plate rests on pins 166 which extend down freely through holes in the bolster plate and engage the top sides of the cross plates 158. When the blank holder 14, operated from the upper portion of the press, comes down and engages the work or blank which rests on the stripper plate, the stripper plate is moved downwardly until a bottom die, which may be rigidly held on the bolster-plate 162 is engaged with the work. During this downward movement of the stripper plate the cross-plates 158 of the stripper slide150 force the stripper slide bodily7 downwardly in its uides in the bed and force the pistons in the uid system downwardly. After the engagement of the outer blank holder 14 with the workon the bottom die the blank holder dwells in its movement and the intermediate top slide comes` into action to draw or stamp themetal. Both the top plunger and the bottom plunger may be used, or if desired either one orboth of these plunger-s need not be provided with 'dies and vwill be ineffective. The twoto slide members 14 and 74 may be used at tlie same time or used singly with either the to plunger,

the bottom plunger orboth accor ing to the character of the work. lBy the provision o five dierent slides almost any character of work and combinations of dies may be dealt with ina satisfactory manner but it is agparent that it is not necessary to use'. all of t e slides at any one time or for any one setting of the press. The bottom plunger as shown in Fig. 11 is movable towards the work or blank at approximately the same time that t thetop. plunger 72 moves toward the work,

curve D in this figure indicating the character ofthe movement of the lower plunger 144. This plunger 'may beused to stamp a hole in the partly-formed work or may be. used as a drawing slide with or without the cooperation of a die heldin the top plunger 7 2. After the dies held by the top slide members have started their lupward movement the stripper plate 165 reestheformed'blank from the bottom dies and movesupwardly carrying the formed work with it.

While the form of apparatusherein described constitutes a preferred embodiment of the invention, it is to be understood that the invention isv not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is dened in the appended claims.

What is claimed is:

1. A drawing press having a frame, three movable die-slides provided in said frame, a crank-shaft rotatable in said frame, and three distinct driven connections from said crankshaft :tor independently operating the three slides, the three slides all being movable to e'ective positions in the same direction relatively to the press.

2. A drawing press comprising a frame, a bed, and three movable die slides mounted in said frame to move in the same direction away from the bed, toggle means for moving one of said slides with a dwell in its movement, toggle means for moving a second slide with a dwell in its movement and means for moving the third slide. 3. A 'press having more than two movable die slide members, a bed, operating means located at one side of the bed, and connections between said means and three of said slide members, said connections being all located at the said one side of the bed.,

4. A drawing 'press comprising a 'frame havin a bed, a irst die slide member land a secon die slide member rovided in said frame, a rotatable crank-s aft. mounted in y.said frame, a vcrank connection from said crank-shaft direct to the rst slide member, and a connection from the crank-shaft to the lsecond slide memberl independent of said crank connection, a third die slide member, means for operating saidI third slide member with a dwell in its movement, and a power shaft operably connected to said crank-shaft and to said operating means.

f' 5. A drawing press comprising a frame, .f -a bed, and hree movable slides mounted within the frame to move in the same direcp tion away from the bed, toggle means for movingv one of said slides with a `dwell in its movement, toggle means for moving a second slide wit `a dwell in its movement, a power-operated crank-shaft, connection from the ends of said crank-shaft to one of said toggle means, a connection from the inner part of the shaft to the other toggle means, v 125 and an additional connection from the inner part of the shaft to the third slide.

6. In a drawing press, a frame, an outer v slide membermounted in said frame for reciprocatorymovement, an intermediate slide member mounted in said outer slide) member member mounted in said outer slide member for reciprocatory movement, an inner slide y member mounted within the intermediate ,shafts to the other of said slide members.

member for reciprocatory movement, and means for reciprocating all of said slide members, said means comprising a shaft rotatably mounted in said frame, a connection from the center of said shaft t\one of said slide members, a connect-ion from inner portions of said shaft spaced from the center thereof for operating another of the slide members and a connection from the end of said shaft for operating still another of the slide members.

8. A drawing press comprising a frame,

y a bed and three nested slide members slidable to positions at one side of the bed, a crank-shaft rotatably mounted in said frame, a direct crank connection between said crankshaft and one of said slide members, a pair of spaced rock-shafts, a toggle connect-ion between said crank-shaft and the rock-shafts, toggle Connections between the rock-shafts and one of the slide members, additional rockshafts, connections between the crank-shaft rand the additional rock-shafts, and toggleconnections between the additional rockshafts and the other slide member.

9. In a drawing press, a frame, a plunger in said frame, and two nested slide members operable with dwells in their movements, a crank-shaft rotatably mounted in said frame,

a pair of rock-shafts symmetrically arrangedin parallelism with thecrank-shaft, driving connections between the crank-shaft and the rock-shafts, means for rotating said crankshaft, a direct driving connection from the crank-shaft to the plunger, toggle connections between the rock-shafts and one of the slide members, additional rock-shafts symmetrically arranged in parallelism with the crank-shaft, driving connections between the 'crank-shaft and the additional rock-shafts,

thevarious said drivingxconnections being symmetrically connected to the crank-shaft, and means connecting said additional rock- 10. A drawing press comprising a frame, a bed, a crank-shaft in said frame above the bed, a plunger reciprocally mounted within said frame, a crank connection between said crank-shaft and said plunger, a second crankshaft in the frame below the bed, a second plunger reciprocally mounted within said frame, a crank connection between the second crank-shaft and the second plunger,me`ans for operating both of said crank-shafts, a blank' holder, and means connected to one of said crank-shafts for operating said blank holder with a dwell in its movement.

11. A drawing press comprisinga frame, a bed in said frame, a shaft mounted in the frame above the bed, a die slide adapted to reciprocate within said frame, an operating connection between said slide and said shaft, a second shaft rotatably mounted in saidv frame below ythe bed, a second die slide adapted to reciprocate within said frame, an operating connection between the second slide and the second shaft, a blank holder, a third, die slide, operating mechanism for the blank holder; and operating mechanism for the third slide. v

12. A drawing press comprising a frame, a bed., a plunger adapted to reciprocate within said frame, a crank-shaft mounted in the frame above the bed, an operating connection between the crank-shaft and the plunger, a second crank-shaft mounted in the frame below the bed, a second plunger adapted to reciprocate within said frame, an operating connection between the second plunger and the second crank-shaft, a slide member in which one of said .plungers is slidably mounted, operating means includinga toggle connection interconnecting said slide member and one of said crank-shafts, a second slide member adapted to reciprocate within said frame, operating mechanism including a toggle connection for driving the second slide member from one of the crank-shafts, and means for driving both of said crank-shafts.

13. In a drawing press, a frame, a rotatable crank-shaft in the top of ythe frame, a second rotatable crank-shaft in the bottom of the frame, a plunger adapted to reciprocate within said frame and connected to each crank-shaft, a blank holder operably intererating meanstherefor, an ejector member for ejecting work upwardly away from the bed, a plunger movable away from the bed in a downward direction, and operating means for said plunger.

15. In a drawing press, a frame, an ejector member slidable in said frame, a plunger slidable in said ejector member, operating means for said plunger located at one side of the vertical center of the press, and a plurality of nested slide members slidable within `the frame at the opposite sideof the press,

and. means for driving said slide members ating connection between the crank-shaft and I ed to reciprocate within said, frame, toggle the toggle shafts, toggle connections between the toggle shaft and one of the slide members, operating shafts concentric with said toggle shafts and provided at both ends of the toggle shafts, operating means for said operating shafts,and toggle connections between said operating shafts and the other slide member.

. i 17. 1n the drawing press, a frame, a pair of die slides one mounted in the frame and the other mounted in the iirst'slide, a plunger adapted to reciprocate within said frame, a crank-shaft rotatably mounted in said frame, a connection between the plunger and the crank-shaft, a rock-shaft connected to the crank-shafts, a toggle connection between the end portions of said rock-shaft and one of said slides, operating shafts concentric with and mounted on said rock shaft,means for driving said operating connection between each of said operating shafts and the other slide.

18. ln a drawing press, a frame, a plurality of nested die slides mounted for reciprocal movement in said frame, toggle systems connected'to each of said slides, andvoperating means for said toggle systems comprising rock-shafts mounted'coaxially and sup- [ported one upon another for oscillatory movement.

19. In a drawing press, a frame,.a bed in the frame, a crank-shaft mounted in .the frame, a plunger adapted to reciprocate within said frame, a-direct connection between the plunger and the crank-shaft, a pair of spaced toggle shafts, means for operating said toggle shafts from the crank-shaft with dwells in their movements, a die slide adaptconnections between the toggle shafts and the die slide, a second die slide, toggle links for operating said second die slide, and means for operating saidy toggle links said means Y being mounted for oscillatory movements on the to gle shafts.y i

20. n a drawing press, a frame, a die slide movable in said frame, a die slide movable within said first die slide, a pair of rockshafts in said frame, toggle connections from said rock-shafts for operating one of said slides, four individual rock-shafts, a toggle connection from each of said individual rockshafts tothe other of said slides, and means for operating said rock-shafts. y

21. 1n a drawing press, a frame, a.' plurality of nested die slides adapted to reciprocate within said frame, link means connected `to the other of saidslides,

shafts and a toggle,

to one of said slides, operating means for yieldingly supporting said stripper slide, a

die slide slidingly mounted adjacent said stripper slide and movableupwardly toward the blank position, and mechanical means for positively operating said die slide.

23. 1n a press of the class described, a frame, a press bed in said frame, a die slide movable in said frame, toggle links connected to said slide for operating it with a dwell in its movements, a second die slide, toggle links connected to said second slide for operating it with a dwell in its movement-s independently of the first slide, and a drive means for operating all of said toggle links.

v24. In a drawing press of the class described, a frame., a press bed in said frame? a die slide movable in said frame, toggle links connected to said slide for operating it with a dwell in its movements, a second die slide slidably mounted within said rst named slide, toggle links comiected to said second Slide for 'operating it with a dwell in its movements independently of the first slide, and drive means for said toggle links.

in testimony whereof l hereto aiiix my signature.

ARTHUR A. BYERLEN.

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