USRE20042E

USRE20042E - Drawing pkess

Info

Publication number: USRE20042E
Authority: US
Publication date: 1936-07-28

Description

July 28 1936. A. A. BYERLEIN- DRAWING PRESS Original Fil ed Dec. 21, 1927 7 Sheets-Shgaet l INVENTORI n; M Md 7w!) ATTORNEYS.

July 28, 1936.

A. A. BYERLEIN Re. 20,042

DRAWING PRESS Origifial Filed Dec. 2l, 1927 7 Sheets-Sheet 2' INVENTOR.

Mali BY, I 7

ATTORNEYS.

July 28, 1936. A. A. BYERLEIN 20,042

- I [DRAWING PRESS Original Filed Dec. 21, 1927 '7 Sheets-Sheet 4 INVENTODR.

'I-1 1-- Maj/Q5 BY m a ez mw ATTORNEYS.

July 28, 1936. BYERLEIN Re. 20,042

DRAWING PRESS Original Filed Dec. 21, 1927 7 Sheets-Sheet 5 III/II/IIIIM I Jg- 5- INVENTOR. Mum/4% BY W 200 A TTORNEYS.

July 28, 1936. A. A BYERLEIN DRAWING PRES 5 Original, Filed Dec. 21, 1927 7 Sheets-Sheet 6 INVENTOR. M4 57 BY I A TTOR NEYS.

A. BYERLEIN Re. 20,042

DRAWING PRESS July 28, 1936.

Original Filed Dec. 21, 192'? 7Sheets-Sheet T A TTORNEY I Reissues] July 28, 1936 UNITED" STATES DRAWIN G PRE S S Arthur A. Byerlein, Detroit, Mich., assignor, by

mesne assignments, to General Machinery Corporation, Hamilton, Delaware Ohio, a corporation of Original No. 1,268,503, dated June 24, 1930, Serial No. 241,547, December 21, 1927.

Application for reissue June 10, 1936, Serial No. 84,581

34 Claims.

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.

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

A further object of the invention is the provision 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 press-bed 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 of the 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 is a side elevation showing the portion of the press below the press-bed partly in 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 6-45 of Fig. 5;

, Fig. 7 is a section on the line l-'l of Fig. 6; Fig. 8 is a section on the line 8-8 of Fig. 5; Figs. 9 and 10 are diagrammatic views of certain linkages;

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

Fig. 12 is a plan view of the bed of the 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 |4--| 4 of Fig. 1 through the end of one of the rockshafts of the press; and

Fig. 15 is a section on the line Iii-l5 of Fig. 14.

Referring to the figures more particularly by reference numerals l0 designates the frame of the press which comprises a bed spaced apart uprights or side frames I2 carrying the actuating mechanism and guiding the outer blank holder for vertical reciprocatory movement, and an arch member l3 which interconnects the two side frames. The outside blank holder H is guided upon guides I5 upon the side frames l2'oi the 10 press.

Means for reciprocating the outside blank holder M in its guides l5 comprises a toggle mechanism consisting of front and rear toggle rockshafts 20 and 2| extending transversely of the press and journaled in bearings 22 at the ends of the rock-shafts and additional bearings 23 provided in the two depending walls 24 which form a part of the arch member l3. The rockshafts 20 and 2| are provided with integral arms 29 26 between the

bearings

22 and 23 near the outer ends of the rock-shafts, the'outer ends of these arms being connected to the upper ends of links 2], the lower ends of these links being pivotally connected to ears I68 on the outside blank holder 5 e H adjacent the four corners thereof. The rockshafts together with the arms 26 and the links 21 constitute toggles forreciprocating the blank holder, it being apparent that rotation of the rock-shafts 20 and 2| in opposite directions re- 3 sults in either raising or lowering the blank holder I4 and since all the corresponding parts move simultaneously and through equal distances the blank holder is raised or lowered, without tilting or binding, and an even pressure is obtained 35 upon the work or blank when this blank holder is in the lowered position.

The rock-shafts 20 and 2| are actuated from a rotatable actuating shaft or crank-shaft 30 journaled in the side frames and extending trans- 4 versely 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 3| which is connected with the rock-shafts 20 and 2| to actuate the same, and which is itself actuated from the crank-shaft 30: The slide-actuating member 3| is supported between the rock-shafts 20 and 2| within a slide housing 32 which guides the slideactuating member for reciprocatory movement along an obliquely disposedline extending from front to rear of the press, the line of movement passing above the front rock-shaft 20 and below the rear rock-shaft 2|, the normal distances between the line 01. movement and the two rockshafts being equal. This arrangement is bestillustrated 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 |3 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 38 with a segmental shaped rock lever 31 pivotally mounted upon pin 38 which is fixed in a lug 39 forming a part of the arch of the press frame. Rocking lever 31 is connected by a link 40 to a second rocking lever 4| which is mounted on pin 42 which, like pin 38, is immovably fixed in the part 39 of the arch. The rocking lever 4| is pivotally connected at its other end with a link 43 which is connected to the pin 45 of the bifurcated rocking lever 4|. 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 51. Link 51 connects through link-pin 58 with the rear end of the slide-actuating member 3|.

The motion is transmitted from the slide-actuating member 3| to the rear toggle rock-shaft 2| through the following connections." The pin 58, which is fixed in the member 3|, carries the ends of two links 59 which are bent so as to en- 'close the outer end portions of the pin 5|]. In-

stead of engaging the pin 50 directly, however, the links 59 are connected through bushings 6| which are rotatable in the forked arms 55 of the toggle rock-shaft 2!. The ends of the link-pin 5|]. are provided with a pair of flat parallel surfaces 5| adapted to be received between cooperating parallel flat surfaces 53 upon the interior of bushings 6|. The bushings are constructed to have a close sliding fit 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 51 with the fiat surfaces 5| parallel to the longitudinal axis of that link, it is apparent that the bushings are constrained to movement upon pin 58 in a direction parallel with the longitudinal axis of the link 51. The rear end of the slide-actuating member 3| is thus connected with the toggle rock-shaft 2| through links 59, bushings GI, and arms 55, and because of the sliding connection between the pin 50 and bushings 6| there is a certain independence of movement betweenthe main linkage which drives the slide-actuating member 3|, and the linkage by which the slideactuating member is connected to the rock-shaft 2|. The connections to the actuating-slide member 3| and to the rock-shaft 2| are shown by Figs. 9- and 10 diagrammatically. In Fig. 10, which corresponds to the position of the partsshown in Fig. 5, the linkages are shown for a down position of the blank holder l4, and in Fig. 9 corresponding to a raised position of this blank holder. In these diagrammatic views, the main linkage -for actuating the slide-actuating member 3| from the crank-shaft 30 is shown by the sectioned parts, and the linkage for actuating the rockshaft 2| from the slide-actuating member is shown in outline. It is evident from these figures and from Figs. 6, 7 and 8 that the link-pin 50 is free to slide in the bushing 8| and to take a position therein depending uponthe 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 3| is connected with the front rock-shaft 20 to drive the latter by a mechanism which consists of a link-pin 41 carried by the slide-actuating member and a link 48 pivoted thereon and pivotally connected at its other end with linkpin 49 carried upon the outer end of the forked arm 63 extending from and rigid with the front rock-shaft 20. v

The linkage between the slide-actuating member 3| and each of the toggle rock-shafts 20 and 2| is such that the latter are actuated through equal angular distances thereby effecting parallel raising and lowering movement of the blank holder |4 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 movements of the slide-actuating member 3| from the crank-shaft 30, and the power divides equally at the slideactuating member and is transmitted through the two equal systems of transmission to the two toggle rock-shafts 20 and 2| which are thus actuated with a considerable dwell in their movements. The power is then transmitted from the two rock-shafts to opposite sides of the blank holder l4 and the blank holder is thus caused to reciprocate with a dwell of, say, as shown by curve A of Fig. 11. The power transmission for actuating the blank holder I4 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 36, as previously mentioned is mounted in bearings in the side frame members I2 and is also rotatably mounted in auxiliary bearings 66 and 61 in the walls 24. Between the two bearings 55 and B1 and the bearings in the frame portions l2 and equidistantly spaced from the center of the crank-shaft 30 are crank-arms 6B and 69 which are connected at their ends to two connecting rods 10, which are pivoted at their lower ends to the central portions of an inner slide member or plunger 12, the connecting rods being provided with the usual length-adjusting devices customarily employed in plunger connections. This plunger 12 is guided for vertical reciprocatory movement within an intermediate die slide member 14 which in turn is guided within the outside blank holder M, as shown in Fig. 13. The intermediate slide member 14, which is operable as a blank holder. and also as a drawing die slide, is connected at its four corners to links 15 the upper ends of which are pivotally connected to arms 16 which as shown are positioned closer to the center of the frame than the toggle links 21, by which the outside blank holder is operated. The arms 16 together with the links 15 form toggles, the arms 16 being fixed to stub rockshafts 18. The rock-shafts 18 are iournaled freely in the outer end of the toggle rock-shafts 20 and 2|. As shown more clearly in Fig. 14 the toggle rock-shafts 20 and 2| are hollow at their ends so as to rotatably mount the stub-shafts 18 concentrically therewith. The hub portion 8| of each toggle arm 15 is received in a socket portion 82 provided on the outer portion of each toggle rock-shaft 20, 2|, and the short rock-shafts 18 are thus prevented from moving endwise within the main toggle rock-shafts. The socket portions 82 as shown in Fig. 15 extend the greater portion of the way around the main rock-shafts 20 and. 15

7 2|, but one side of the socket 82 is open to permit relative rotational movement of the toggle arm 8| and the transmission of power from the rockshaft 18 to the toggle connection to the intermediate slide member 14. Although both the toggle rock-shafts 20, 2I and the short rockshafts 18 are rocked back and forth through a considerable angle, nevertheless, as both the main toggle rock-shafts 20, 2I and the additional short shafts 18 operate in the same direction at the same time through at least part of their movement in moving both the intermediate slide member 14 and the outside blank holder I4 downwardly or upwardly, the socket members 82 may extend throughout a major portion of the circumferential extent of the main rock-shafts 20, 2i.

At the outer end of each short rock-shaft 18 is an arm 84 which is pivotally connected to a link which in turn is pivoted on pin 86 provided in a slide 81 provided at one side of the press, a corresponding slide 88 being provided at the opposite side of the press. The two slides 81 and 88 are vertically guided for reciprocatory movement in the slide guides 89 and located at the upper side portions of the press and in the middle plane of the press in a forward and rearward direction. Each of these slides is pivotally connected by means of a pin 9| to a connecting rod 92 which is pivoted at its lower end on pin 93 provided at the end of a crank-arm 94 on the main crank-shaft 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 .81 and 88 are similar in their construction and symmetrically arranged on the press. The four short stub-shafts 18 thus reciprocate the intermediate slide member 14 with a considerable dwell in its movement due to the toggle connections between the short shafts 18 and the slide 14 and also due to the connections between the arm 84 and the crank-shaft.

The dwell in the movement of the intermediate slide member 14, as shown in Fig. 11 commences after the start .of the dwell in the outer blank holder I4, thev dwell of the intermediate slide member 14 being indicated by the curve B in the figure referred to. The plunger or inner slide member 12 has a motion which is indicated by the curve C. From Fig. 11 it is apparent that in the operation of the machine, the outside blank holder I4 first moves downwardly and then dwells in its movement. At the start of dwell in the movement of the outside blank holder, indicated by reference numeral 91 of curve A, the intermediate slide member 14 continues to move downwardly and completes its travel to its down position through the space 98 during which opera tion the die carried by this intermediate slide member operates as a drawing die to thus complete a first drawing operation on the metal before this intermediate slide member pauses at the point 99- in its downward movement and dwells. At the start of dwell of the intermediate slide member 14 the plunger 12 is moving downwardly and the plunger completes its movement through the space I00 and punches or draws the metal or blank while moving through this distance. During the eifective 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 point being indicated at IN on curve C. After the plunger 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 made in a single complete operation to -5 provide an opening or a double draw 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 14 and the outer slide member I4 is 'symmetrical with respect to the center of the crankshaft. The power is preferablysupplied to the crank-shaft by means of two gears I04 and I05 which are fixed to the crank-shaft 30 adjacentits ends and just inside of the crank-arms 94. The two gears I04 and I05 are driven through pinions 20 I06, one provided at each end of a transverse drive-shaft I01 which is in turn fixed to a driving gear I08. Gear I08 mesheswith a pinion I09 fixed on shaft IIO extending across the press which also carries a wheel III. This wheel III 25 is driven by a belt II2 operated by means of a motor II3 provided on a bracket II4 which is fastened rigidly in place to an upper portion of the press. The bearings for the shafts I01 and H0 are provided in a bracket II5 which is at- 30 tached rigidly in place to one side of the press frame.

The power-transmitting shaft H0 in addition to carrying the drive pinion I09 and wheel III is also rigidly attached to and drives a beveled 35 drive-gear II8. Engaging the bevel gear H8 is a driven bevel gear II 9 provided at the upper end of an upwardly extending shaft I20 at the rear side portion of the press. .The shaft I20 is mounted at its upper end in a bearing I2I which is fixed to the press frame. The lower end of the shaft I20 is mounted in a bearing I23 provided in a box or case I24 at one side of the press near the bed. Rigidly connected to the lower end of the shaft I20 is a beveled gear I25 which engages with a beveled gear I26 carried by shaft I21 journaled for rotation in bearings I28 provided at the rear of the press as shown. This shaft I21 is also provided with a drive spur-gear or pinion I29 which engages spur-gear I30 fixed on the transverse shaft I 3| journaled at its ends in bearings I32. Shaft I3l carries a pinion I33 which gears with the large spur-gear I34 provided at one side of the press on amain lower crank-shaft I35 which is journaled in bearings I36 and auxiliary bearings I31 in a bottom housing I39, which is positioned below and fixed to the press-bed II by removable tie rods I39 which are extensions of the main top tie rods I40. the bottom housing being spaced from the bed by a spacing portion I. The crank-shaft I35 is located some distance below the press bed and centrally 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 crankarms I 41 pivotally connected to connecting rods I42 which in turn are pivotally connected by pins I 43 to a bottom slide member or plunger I44. The connecting rods I42 are formed of telescopic sections I45 and I46 so that their lengths may be adjusted to adjust the limits of movement of the bottom plunger I44, such an arrangement being similar to the length adjusting connection by means of which the upper plunger 12 is operably connec ed to t e crank shaft 30.

Slidably mounted in the bed I I of the press and suitably guided therein is a stripper slide I50 this slide being in the form of a hollow shell or box open at the lower end and guided for vertical reciprocatory motion. This slide I50 guides the plunger I44 as by means of the guide ways I5I provided in the slide I50 which extend into cor-' responding guide slots in the plunger. The lower portion of the stripper slide I50 is provided-at its four corners with the outstanding brackets I54 each of which is fastened to the upper end of a piston-rod I55. In the positions shown in Figs. 3 and 4, the stripper slide I50 and the piston-rods I55 are at their upper limits of movement and the pistons, provided at the lower ends of the piston-rods I55, are adjacent upper portions of the four fluid cylinders I50 provided at the four corners of the bottom of. the press. These four cylinders contain fluid and act as a means for permitting the cushioned downward movement of the stripper slide I50 and as a means for returning this slide upwardly after the same has been released. At the top of the stripper slide I50 are the three cross-plates I58 extending from front to rear of the press and attached at their front and rear portions to the front and rear sides of the stripper slide I50. The cross-plates I58 move between strength members I60 extending from front to rear of the press and removably supported at their ends at front and rear portions of the press-bed in a rigid manner. The top sides of these strength members I50 support the heavy bolster-plate I62 which may be rigidly attached to the press-bed, overlying the front and rear sides I63 and I54 of the press-bed. The plunger I44 is provided with forwardly and rearwardly extending recesses or slots in which the strength members I50 may be received, and the uppermost limit of movement of the plunger I44 is such as to just clear the lower sides of the beams I60. The lower ends of the beams 50 act as bumpers to limit the upward movement of the stripper slide I50, pins I6I being provided between the beams I60 and the recessed portion of the stripper slide in which the beams I60 are received.

The plunger I44 may be operably connected to a plunger die as by means of vertical pins projecting down through holes in the bolster-plate I62 and through the cross-plates I58 of the stripper slide. The 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 I65 may be employed to engage the lower side of the work or blank and cooperate with upper slide or slides in a drawing operation or for the removal or disengagement of the work after it has been formed. This stripper plate rests on pins I55 which extend down freely through holes in the bolster plate and engage the top sides of the cross plates I58. When the blank holder I4, 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 IE2 is engaged with the work. During this downward movement of the stripper plate the cross-plates I58 of the stripper slide I50 force the stripper slide bodily downwardly in its guides in the bed and force the pistons in the fluid system downwardly. After the engagement of the outer blank holder I 4 with the work on the bottom die theblank holder dwells in its movement and the intermediate top slide will be ineffective.

comes into action to draw or stamp the metal.

Both the top plunger and the bottom plunger may be used, or if desired either one or both of these plungers need not be provided with dies and The two top slide members 5 I4 and 14 may be used at the same time or used singly with either the top plunger, the bottom plunger or both according to the character of the work. By the provision of five different slides almost any character of work and combinations of dies may be dealt with in a satisfactory manner but it is apparent that it is not necessary to use all of the 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 15 blank at approximately the same time that the top plunger I2 moves toward the work, curve D in this figure indicating the character of the movement of the lower plunger I44. This plunger may be used to stamp a hole in the partlyformed work or may be used as adrawing slide with or without the cooperation of a die held in the top plunger I2. After the dies held by the top slide members have started their upward movement the stripper plate I65 frees the formed blank from the bottom dies and moves upwardly carrying the formed work with it.

While the form of apparatus herein described constitutes a. preferred embodiment of the invention, it is to be understood that the invention is 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 defined in the appended claims.

What is claimed is:

1. A drawing press having a frame, three movable die-slides provided in said frame, a crankshaft rotatable in said frame, and three distinct driven connections from said crank shaft for independently operating the three slides, the three 40 slides all being movable to effective 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 having a bed, a first die slide member and a second die slide member provided in said frame, a rotatable crank-shaft mounted in said frame, a crank connection from said crank-shaft direct to the first 7 slide member, and a connection from the crankshaft to the second slide member independent of said crank connection, a third die slide member, means for operating said third slide member with a dwell in its movement, and a power shaft operably connected to said crank-shaft and to said operating means.

5. A drawing press comprising a frame, a bed, and three movable slides mounted within them 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. a power-operated crank-shaft. con- 75 nection 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,

and an additional connection from the inner part in said frame and having three independent,

driven connections for reciprocating all of said slide members.

7. In a drawing press, a frame, an outer slide member mounted in said frame for reciprocatory movement, an intermediate slide member mounted in said outer slide member for reciprocatory movement, an inner slide member mounted within the intermediate 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 to one of said slide members, a connection 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,'a bed and three nested slide xt'embers slidable to positions at one side of the bed, a crank-shaft rotatably mounted in said frame, a direct crank connection between said crank-shaft and one of said slide members, a pair of spaced rock-shafts, a toggle connection between said crank-shaft and the rock-shafts, toggle connections between the rock-shafts and one of the slide members, aciditional rock-shafts, connections between the crank-shaft and the additional rock-shafts, and toggle connections 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 crankshaft rotatably mounted in said frame, a pair of rock-shafts symmetrically arranged in parallelism with the crank-shaft, driving connections between the crank-shaft and the rockshafts, means for rotating' 'sa id crank-shaft, 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, the various said driving connections being symmetrically connected to the crank-shaft, and means connecting said additional rock-shafts to the other of said slide members.

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 crank-shaft in the frame in said frame, a shaft mounted in the frame above the bed, a die slide adapted to recnprocate within said frame, an operating connection between said slide and said shaft, a second shaft rotatably mounted in said frame below the 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. 1

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 crankshaft mounted in the frame belowthe 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 including a 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' the 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 interconnected to one of said crank-shafts, common driving means for both of said crank-shafts, said plungers being operable toward each other and away from each other during the inward and outward strokes of the plungers respectively.

14. In a drawing press, a stationary bed, a frame in which said bed is provided, a plurality of die slide members movable within said frame to positions above the bed, operating means therefor, 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 adrawing 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 side of the press, and means for driving said slide members with dwells in their movements.

16. In a drawing press, a frame, two die slide members movable in the frame towards effective positions in the same direction relatively to the press, a pair of toggle shafts in the frame, a crank-shaft in the frame, operating connection between the crank-shaft and the toggle shafts, toggle connections between the toggle shafts 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.

' 17. In the drawing press, a frame, a pair of die slides one mounted in the frame and the other mounted in the first 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 rockshaft connected to the crank-shaft, a toggle connection between the end portions of said rockshaft and one of said slides, operating shafts concentric with and mounted on said rock shaft, means for driving said operating shafts and a toggle connection between each of said operating shafts and the other slide.

18. In a drawing press, a frame, a plurality of nested die slides mounted for reciprocal move- ,ment in said frame, toggle systems connected to each of said slides, and operating means for said toggle systems comprising rock-shafts mounted coaxially and supported one upon another for oscillatory movement. I

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 crankshaft with dwells in their movements, a die slide adapted to reciprocate within said frame, toggle connections between the toggle shafts and the die slide, a second die slide, toggle links for operating said second die slide, and means for operating said toggle links said means being mounted for oscillatory movements on the toggle shafts.

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

21. In a drawing press, a frame, a plurality of nested die slides adapted to reciprocate within said frame, link means connected to one of said slides, operating means for said link means comprising rock-shafts ,journaled in said frame, a set of links connected to the other of said slides, and additional rock-shafts connected to said set of links and mounted in alignment with said first named rock-shafts.

22. In a drawing press, a frame, a stationary be'd associated with said frame, a drawing slide movable downwardly towards the bed, a stripper slide mounted in said frame and adapted to support a blank, means for yieldingly supportingsaid stripper slide, a die slide slidingly mounted adjacent said stripper slide and movable upwardly toward the blank position, and mechanical means for positively operating said die slide.

23. In 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 movements independently of the'first' slide, and a drive means for operating all of said toggle links.

' 24. 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 first named slide, toggle links connected 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.

25. In a drawing press of .the class described, a frame, a press bed in said frame, a die slide movable in one direction 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 first named slide and operable in the same direction, toggle links connected to said second slide for operating it with a dwell in its movements independently of the first slide, a die slide mounted in said frame for reclprocatory movement in a direction counter to that of said first two slides, and drive means for said toggle links and for said third die slide.

26. In a drawing press of the class described, a. frame, a press bed in said frame, a die slide movable in one direction in said frame, toggle links connected to said slide for operating it with a dwell in its movements, 9, second die slide slidably mounted within said first named slide and operable in the same direction, toggle links connected to said second slide for operating it with a dwell in its movements independently of the first slide but with a conjoint period of dwell for said two slides, a die slide mounted in said frame for reciprocatory movement in a direction counter to that of said first two slides, and drive means for effecting sequence operation of said several toggle links and connected slides and said third die slide whereby said third die slide performs its drawing movement within said period of conjoint dwell.

27. In a drawing press of the class described, a

frame, a press bed in said frame, a die slide movable in one direction in said frame, means connected to said slide for operating it with a dwell in its movements, said means including toggle links, a second die slide slidably mounted within said first named slide and operable in the same direction, means connected to said second slide for operating it with a dwell in its movements independently of the first slide but with a conjoint period of dwell for said two slides, said means including togglelinks, a third die slide mounted in said frame for reciprocatory movement in the direction counter to that of said first two slides, and means for effecting operation of said several die slides in timed relation whereby said third die slide performs its drawing movement within said period of conjoint dwell.

28. In a drawing press of the class described,

.a frame, a press bed in said frame, a die slide I movable downwardly in said frame towards said bed, means including toggle links connected adiacent the four corners of said slide for operating it with a dwell in its movements so that said slide acts as a blank holder, a second die slide slidably mounted within and movable in the same direction as said first named slide, means including toggle links connected adjacent the four corners of said second slide and operating it to draw in said first named direction and then with a dwell in its movements independently of the first slide to act as a. second blank holder, a third die slide slidable in said press bed and operable in a direction counter to that of said first two slides for effecting a drawing operation in said opposite,.direction, means for operating said third die slide in said opposite drawing operation and drive means for said several toggle links and for said third die slide operating means for operating the same in timed relation ed in the lower part of said frame for movement in'a direction counter to the movement of said upper die slides, a pair of operating members symmetrically arranged in parallelism within the upper part of said frame, means connecting said operating members to said nested die slides and including toggle links, for effecting operation of said first and second die slides each with a dwell in its movements independently of the other, an operating member within the lower part of said frame, means for connecting said operating member to the die slide in the lower part of said frame for effecting movement thereof in a direction counterto the movement of the upper slides and in timed sequence with respect thereto, whereby said lower die slide efi'ects a drawing operation during a period of conjoint dwell of the upper die slides, and means for causing operating movement of the several operating members.

30. In a drawing press of the character described, a frame, a press bed in said frame, a die slide movable in the upper part of said frame, a second die slide slidably'mounted within said first named slide, a third die slide mounted in the lower part of said frame for movement in a direction counter to the movement of said upper die slides, operating members symmetrically arranged in parallelism within the upper part of said frame, means connecting said operating members to said nested die slides and including toggle links, for effecting operation of said nested die slides each with a dwell in its movements independently of the other, operating means within the lower part of said frame, means for connecting said operating means to the die slide in the lower-part of said frame for effecting movement thereof in a direction counter to the movement of the upper slides and in timed sequence with respect thereto, whereby said lower die. slide effects a drawing operation during a period of conjoint dwell of the upper die slides, driving means for said pair of operating shafts,

and driving interconnection therefrom to said lower operating means.

31. In a drawing press of the character described, a frame, a bed in said frame, operating members mounted in the frame above said bed and including toggle links, a die slide adapted to reciprocate within said frame, operating connection between said slide and said toggle links, a second operating member mounted within said frame below the bed, a second die slide adapted to reciprocate withinsaid frame in a direction counter to the movement of said first named slide, said second die slide being operatively connected to said second operating member for etnecting a drawing operation, other operating members mounted within the upper portion of said frame and including toggle links, and a third slide slidably mounted within said first named slide and operatively connected to the toggle links of said last named operating members for reciprocation with independent dwell in the same direction as said first named slide and means for effecting operation of said several slides in timed sequence, whereby the second slide effects a drawtions pivotally connected to said last mentioned ing operation while said first and third slides dwell.

32. In a drawing press of the class described, a frame, a press bed in said frame, a plurality of nested die slides adapted to reciprocate with- 5 in said frame and one slidably mounted within the other, a set of toggle links connected to one of said slides, operating means for said links comprising rock members supported in said frame and journaled for oscillatory rocking movements and having projecting arm portions pivotally connected to said links, a second set of toggle links connected to the other of said slides, additional rock members having projecting arm por- 5 toggle links and mounted in alignment with said first named rock members, a third die slide mounted in said bed for reciprocatory movement and operable in a direction counter to both of said nested die slides, and means for operating said toggle operated slides and third die slide in timed relation, and said toggle operated slides each with a dwell in its movements independently of the other.

33. In a drawing press of the character described, a frame, a press bed in said frame, three nested slides movably mounted within the upper part of said frame and one slidably mounted within the other, a die slide mounted in the lower part of said frame formovement in a direction counter to the movement of said upper die slides, operating members arranged within the upper part of said frame, means connecting saidoperating members to two of said nested die slides and including toggle links, for effecting operation of said nested die slides with independent dwells in their movements, means connecting the other of said upper slides to said operating members for effecting operation in timed sequence with said toggle operated-slides, an operating member within the lower part of said frame, means for connecting said lower operating member to the die slide in the lower part of said frame for eflecting movement thereof in a direction counter to the movement of the upper slides and in timed sequence with respect thereto, whereby said lower die slide effects a drawing operation during a period of conjoint dwell of the toggle operatedupper slides, and means for causing operating movement of the several operating members.

34. In a drawing press of the class described, a frame, a press bed in said frame, a die slide movable in one direction 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 first named slide and operable in the same direction, toggle links connected to said second slide for operating it with a dwell in its movements independently of the first slide, a third die slide mounted in said frame for reciprocatory movement in the same direction as said toggle operated slides, a die slide mounted in said frame for reciprocatory movement in a direction counter to that of said first three slides, and drive means for said toggle links and for said other two die slides.

. ARTHUR A. BYERLEIN.