US1283829A - Punching-die. - Google Patents

Description

E. LUESSER.

PUNCHING DIE.

APPLICATION FILED MAY 16. ms.

1,283,829. Patented Nov. 5, 1918.

3 SHEETS-SHEET l.

WITNESSES:

INVENTOR l I Erlg sZ'Laessez ATTO R N EY$ E. LOESSER.

PUNCHING DIE.

APPHCATION FILED MAY 16. mm.

Patented Nov. 5,1918.

3 SHEETS-SHEET 3- ERNEST LOESSER, OF GLEN RIDGE, NEW JERSEY.

PUNCI-IING-DIE.

Specification of Letters Patent.

Patented Nov. a, rare.

Application filed May 16, 191.8. Serial It io. 234,956.

To all whom it may concern:

Be it known that I, Emvnsr IJOESSER, a

citizen of the United States, residing at Glen Ridge, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Punching- Dies; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to charactors of reference marked thereon, which form a part of this specification.

The present invention has reference, generally, to improvements in punching or perforating dies for use with power presses and the like; and the invention relates, more particularly, to an improved construction of punching or perforating dies, including a novel arrangement and construction of auto-- matic work holding and positioning chuck.

The invention has for its principal object to provide a simple and strong set of dies adapted to be used in a power press for punching a plurality of holes or perforations in tubes or other structures at spaced longitudinal intervals and spaced lateral intervals, each longitudinal series of holes or perforations being formed in staggered relation t adjoining longitudinal series thereof; said novel construction of dies having a novel work holding chuck which automatically positions the work and holds the same for each punching or perforating operation, whereby the work is automatically shifted and turned to locate in the desired position each series of holes or perforations produced by the punching means.

Other objects of the present invention, not at this time more particularly enumerated, will be clearly understood from the following detailed description of the same.

With the various objects of the present invention in View, the same consists, primarily, in the novel construction of punch ing or perforating dies hereinafter set forth; and the invention consists, furthermore, in the several novel arrangements and combinations of the various devices. and parts, as well as in the details of the construction of the same, all of which will be hereinafter more fully described, and then finally embodied in the claims appended to this specification.

The invention is clearly illustrated in the accompanying drawings, in which Figure 1 is a side view of the novel punchlng or perforating dies made according to and embodying the principles of the present invention, the same being shown applied in operative relation toa power press, portions of the latter being broken away to more clearly illustrate the working parts of the press with which the dies are operativelv related. p i

Fig. 2 is a plan view of the chuck and work holding devices forming a part of the novel construction of dies, the same being detached from the press.

Fig. 3 is a vertical longitudinal central section through the dies, drawn on an ei1- larged scale.

Fig. l is a detail cross section, taken on line H in said Fig. 3, looking in the direction of the arrow .13; and Fig. 5 is a simi: lar view showing the operation of the chuck rotating means as controlled by the descent of the punching member of the dies.

Fig. 6 is another detail cross section, taken on line 6-6 in said Fig. 3, also looking in the direction of the arrow :12; and Fig. 7. is

a similar view showing the punching member of the dies-at thecompletion of its working stroke. a i

Fig. 8 is a detail longitudinal section through the chuck bearing block, illustrating the pin and cam-groove means governing the automatic longitudinal shifting movements of the chuck for controlling the longitudinal positioning of the work beneath the punching member of the dies, said view being drawn on a still further enlarged scale.

Fig. 9 is a detail cross section taken on line 9-9 in said Fig. l, and illustrating the means for preventing backward rotation of the work holding chuck.

Fig. 10 is a side elevation of a tube provided with the holes or perforations pro duced by the novel punching orperforating dies; and Fig. 11 is a detail cross section thereof, taken on line 11-11 in said Fig. 10.

Similar characters of reference are employed in all of the hereinabove described views, to indicate corresponding parts.

Referring now to said drawings, thereference character 1 indicates a power press frame, provided with the usual supporting table 2 above which is supported, in slidable down by'the operation of the press.

relation to the frame 1, the reciprocating stamp or hammer-member 3 driven by the crank-shaft 4: through the medium of the connecting rod 5.

The novel construction of punching or perforating dies comprising the essential features ofthe present invention consists of a punching member comprising the carrying block 6 having the neck-stud or shank 7 for reception into the lower end of the stamp or hammer-member 3 of the press,

whereby the punching member is secured to the latter so as to be reciprocated up sang carrying block is provided at its under side,

with a plurality of longitudinally alined and spaced punch-sockets 8, in which are received the series of perforating punches 9, the latter being fixed in position by means of set screws 10, or any other suitable form of fastening means.

Secured upon the supporting table 2 of the press, in proper position beneath the stamp or hammer-member and the punching member carried thereby, by any suitable form of fastening means is a bed-plate 11. Supported upon the rearward end of said bed-plate 11, in fixed relation thereto, so as to be alined directly beneath said punchingmember and its perforating punches 9, is an anvil-block 12, provided in its upper surface with a longitudinally extending V shaped receiving groove or channel 13.

Secured upon the forward end of said bed-plate 11 is a bearingblock 14 having a longitudinally extending bearing-opening 15 extending therethrough. Journaled in said bearing-opening 15 is a chuck-spindle 16, provided at its end projecting toward said anvil-block 12 with a rectangular camhead 17. Formed in the external surface of said chuck-spindle 16 is a cam-groove 18; a pin 19 fixed in said bearing-block 14 projects into said cam-groove 18 so as to ride therein. Said cam-groove 18 is so formed, that upon each quarter revolution of the chuck-spindle the same will be moved alternately forward and backward to alternately shift the work longitudinally relative to the perforating punches. The end of said chuck-spindle carrying the cam-head 17 is provided with a conical seat 20, and the chuck-spindleis provided with a cylindrical bore 21 extending inwardly from the opposite end thereof terminating at shoulder 22 formed at the inner end of said conical seat 20. Arranged within said bore 21 is a split chuck-sleeve 23, the free end of the arms of which are provided with chuck-j aws 24L having conical back-portions 25 adapted to slidably engage said seat 20. Threaded upon the inner end of said chuck-sleeve 23, or otherwise secured thereto, is a tubular tailmember 26 which extends beyond the bearing block 14:, and which is provided at its exterior end with a centering bushing 27. A compression spring 28 is coiled about said chuck-sleeve 23 between the shoulder 22, and the shoulder 26 formed by the inner end of said tail-member 26 where it joins the said chuck-sleeve. Said spring, thrusting from said shoulder 22 against the tail-member tends to draw the conical back-portions 25 of the chuck-jaws 2 1 inwardly against the conical seat 20, producing a wedging action tending to close the chuck-jaws 24- grippingly upon the work inserted between the same.

Connected with said carrying-block 6 of the punching member is a chuck-spindle rotating device comprising a vertically depending bracket-arm 29, fixed in proper location upon the forward end of said carrying block 6. Said bracket-arm 29 is provided at its lower free end with a bifurcated portion 30, in the fork of which is pivotally mounted a trip-dog 31, which is normally projected from the side of said bracket-arm 29 by means of a leaf-spring 32 so as to engage said rectangular cam-head 17 upon a downward movement of the punching member.

In order to prevent backward rotation of the chuck-spindle 16, said bcaring-block 1 1 is provided with a transverse slot 33 communicating with the bearing-opening 15. Pivoted so as to swing through said slot 33, by means of the pintle 34-, is a stop-pawl 35, having a nosing 36. Said chuck-spindle 16 is provided in its circumferential surface, at 90 degree intervals, with receiving channels or grooves 37 adapted to be successively registered with the nosing 36 of said stop-pawl 35 at each quarter turn of said chuck-spindle, so that said nosing drops thereinto to check any rotation of the spindle, except in a proper forward direction. A leaf-spring 38, anchored by means of a suitable fastening means, such as a screw 39, to the bearing-block 14, extends across said stop-pawl 35 to constantly depress the same into operative relation to said chuckspindle 16.

The reference character -10 indicates a combined clamp and stripper plate, associated with and above said anvil-block 12. Connected with said bed-plate 11, at one side of said anvil-block 12, is a post 11, the threaded lower end of which screws into said bed-plate so as to be capable of vertical adjustment relative thereto, a lock-nut 412 being provided to lock said post in desired adjusted position. The upper end of said post is provided with a head 13. Said clamp and stripper plate is provided with an opening 41 for the reception of said post in such a manner that the head 43 prevents displacement of the plate from the post. The opening 4 1 is of such conformation as will permit the plate to rock vertically relative to said post, 77. e. the inim m ternal sides of said opening 441 are of convex conformation. Said clamp and stripper plate extends laterally across said anvilblock 12, and its opposite free marginal edge is provided with a downwardly projecting fixed spring-post 4:5. The reference character 4-6 indicates a vertically movable yolreplate having a central opening 47 through which said spring-post extends, so that said yoke-plate is freely movable vertically relative to said spring-post i5. Secured upon the lower free end of said. spring-post 15 is a nut 48, or other suitable means, for receiving and seating a compression spring 49, which is coiled around said spring-post be tween said nut 4-8 and said yoke-plate 1.6. Connected with the opposite ends of said yokeplate 4E6 are a pair of upwardly projecting depressing-studs 50, which extend upwardly through openings 51 in said clamp and stripper plate, so as to project above the upper surface of the latter. Fired to and pro ect- .ing upwardly from said anvil-block 12 are a pair of steadying-pins 52, which ride in openings 53 provided in said clamp and stripper plate, and which serve to prevent lateral displacement of the latter from operative relation to said anvil-bloeln Also connected with said anvil-block are a pair of sockets 54 in which are slidably disposed vertical pins 55, pressed upwardly by springdevices 56 arranged within said sockets beneath said push-pins. "Said push-pins tend to normally lift said clamp and stripperplat vertically slightly away from said anvil-block. Said clamp and stripper plate is further provided with a plurality of vertical openings or punch-passages 57, through which the descending punches 9 may gain access to the work supported upon the anvilblock beneath said clamp and stripper plate.

The operation of the mechanism, con structed as above described, is as follows The tubes 58 to be perforated are inserted successively through the centering bushing 27 so as to pass through the tail-member 26, and into and through the chuck-sleeve 23, until the foremost tube enters between the chuck-jaws 271, and projects outwardly therefrom so as to lie within the ll-shaped receiving groove or channel 13 of the anvil-block 12, being thus supported or backed by the latter in properly alined position in the path of descent of the punches 9, In thrusting the tubes 58 outwardly from the chuck-jaws 24, the tendency of the latter is to move or yield outwardly, thus ermitting the conical back-portions 25 to ri e outwardly upon the diverging surfaces of the conical seat 20, and consequently permitting the chuck-jaws to spread apart, open or yield to such outward movement of the foremost tube. When the foremost tube has reached the desired limit of outward movement, and the operator ceases to push on the entrained tubes, the

spring 28 thrusting rcarwardly upon the shoulder 26 tends to retract the tail-member 26 and the chuclcsleeve 23 connected therewith, thus causing the conical back-portions 25 of the chuck-jaws 2 f to move inwardly against the converging surfaces of the conical seat 20, whereby the chuck-jaws 24L are pressed together to grip the embraced inner end of the foremost tube 59, and thereby firmly hold the same (all of which will be more readily understood from an inspection of Fig. 3 of the drawings).

The foremost tube 58 is now engaged and supported by the anvil-block 12; the punching member is carried downward by the stamp or luuniner-incmber 3. The de scending carrying block 6 first engages the upwardly projecting ends of said depressing studs 50, thereby pushing the same downward and consequently forcing downward the yoke-plate -16, which compresses the spring 4-9, between the yoke-plate and the nut 48. Such action places the spring under tension, and causes the same to press down on the nut 48, this downward pressure ere erting a pull upon the spring-post 15 which is transmitted by the latter to the clamp and stripped late l0, causing the same to swing" downwarcly with clamping pressure upon the foremost tube 58 as it lies upon. the anvilbloclr 12 (as shown. in Fig. 7 of the drawings). The foremost tube 58 is thus firmly clamped upon the anvil-block preparatory to the operative engagement of the punches 9 therewith. it continued descent of the stamp or hammerunember 3 plunges downward the carrying-blockfi and its punches 9, the latter passing through the punch passages 57 of said clamp and stripper plate into operative perforating engagement with said tube. Upon the return or ascending movement of the stampor hammer-member 3, the punches 9 are withdrawn from the tube. The witl'idrawing movement of the punches 9 is completed before the carrying block entirely releases the depressing-studs 50, consequently the spring i9 is maintained under sufficient tension during said withdrawing movement of the punches 9, to keep said clamp and stripper plate drawn tightly down upon the tube, so that the plate serves to strip tl e tube from the punches 9. After the punches 9 are thus freed from the tube, the carrying-block 6 continues its ascending movement and therefore moves away from. the depleasing-studs 50, thus releasing the tension of the spring -19, and permitting the spring-pr ssed push-pins 55 to raise the clamp and stripper plate away from the tube 58, the parts thus assuming normal initial position, and the tube 58 having formed therein one longitudinal. row of the desired holes or perforations 59.

As the stamp or hannner-member 3 again descends, the ca-rryingblock 6 in moving downward carries said bracket-arm 29 downward, thus bringing said trip-dog 31 into engagement with a corner of the rectangular cam-head 17 of the chuck-spindle 16. The downward pressure of said tripdog 31 causes said cam-head to rotate until the upper face of the cam-head is brought up against the stop-face ($0 of the bracketarm the trip-dog 31 yielding to such movement against the tension of the spring 32 (as shown in Fig. 5 of the drawings). This action produces a quarter turn or revolution of the chuck-spindle 1(3, and since the chuck-jaws 24 are still gripping the end of the foremost tube 58, the latter is also given a quarter turn upon the anvilblock 12. The operation of the trip-dog 31, in thus turning the chuck-spindle and the tube 58, is completed before the carrying-block 6 engages the depressing-studs 50, so that during the turning of the tube the clamp and stripper plate is raised and disengaged from the tube, permitting the same to turn freely. Simultaneously with the turning of the chuck-spindle l6 and the tube 58, the camgroove 18 riding on the pin 19 causes the chuck spindle 16 to perform a longitudinal shifting movement in one direction, which shifts the tube 58 longitudinally upon the anvil-block 12, so that upon completion of the quarter turn of the tube a longitudinal displacement of the tube from the first position is accomplished. Upon the descent of the punches 9 upon the tube,

thus shifted both longitudinally and rota tably, the line of perforations 59 produced in the tube will be located 90 degrees from the first line of perforations 59, and in longitudinally staggered relation to said first line of perforations. Upon the next quarter turn of the chuck-spindle and tube preparatory to punching the third line of perforations, the cam groove 18 is formed to shift the. tube longitudinally back to the same 1ongitudinal position occupied thereby when the first line of perforations was produced; and upon the succeeding quarter turn of the chuck-spindle and tube preparatory to punching the fourth line of perforations, the cam-groove 18 is formed to again shift the tube longitudinally back to the same longitudinal. position occupied thereby when the second line. of perforations was produced;-

the result of these operations being that upon the completion of four reciprocations of the punches 9, the tube has been successively given quarter turns and alternate longitudinal shifts with the effect, of providing longitudinal rows of perforations spaced 0 degrees apart about the circumference of the tube, and the perforations of one row being staggered in position relative to the perforations of adjoining rows thereof (as shown. in Figs. 10 and 11 of the drawings).

As the four punching operations are complet-ed, the operator pushes through the centering bushing 27 another blank tube 58, thereby forcing'the completely perforated tube out of the chuck-jaws, whereupon the same is free to slide off and away from the anvil-block 12, and a second tube is pushed through the chuck-jaws, and gripped by the end as it extends upon the anvil-block in the manner already above described, the four punching operations being then repeated as above described.

It will be apparent from the above description that the present invention provides a novel arrangement of punching or perforating dies, which serve not only to punch a multiplicity of holes quickly and accurately, but also serves to automatically control and position the work relative to the punches so that a desired variation of position of the holes or perforations produced by the punches is accurately obtained.

I am aware that some changes may be made in the general arrangements and combinations of the several devices and parts, as well as in the details of the construction of the same, without departing from the scope of the present invention as set forth in the'foregoing specification, and as defined in the claims appended thereto. Hence, I do not limit my invention to the exact arrangements and combinations of the various devices and parts as herein set forth, nor do I confine myself to the exact details of the construction of the said parts as illustrated in the accompanying drawings.

I claim 1. In a device of the kind described, a vertically reciprocating punching means, means for supporting the work in alinement with said punching means, a bearing block, a chuck-spindle j'ournaled in said bearing block, a chuck means carried by said chuckspindle for engaging one end of the work, a rectangular cam-head on said spindle, a depending bracket-arm carried by said punching-means, and a pivoted spring positioned trip-dog at the lower free end of said bracket arm adapted upon the descent of said punching means to engage said rectangular cam-head to turn the same to produce a limited rotative effect upon said chuckspindle and the work preparatory to each punching operation.

2. In a device of the kind described, a vertically reciprocating punching means, means for supporting the work in alinement with said punching means, a bearing block, a chuck-spindle journaled in said bearing block, a chuck means carried by said chuckspindle for engaging one end of the work, a rectangular cam-head on said spindle, a depending bracket-arm carried by said punching means, a pivoted spring positioned trip-dog at the lower free end of said bracket arm adapted upon the descent of said punchmesses ing means to engage said rectangular camhead to turn the same to produce a limited rotative efiect upon said chuck-spindle and the work preparatory to each punching operation, and means for producing longitudinal shifting movements of said chuckspindle and the work alternately in opposite directions simultaneously with each rotative movement of said chuck spindle.

3. In a device of the kind described, a vertically reciprocating punching means, means for supporting the work in alinement with said punching means, a bearing block, a chuck-spindle journaled in said bearing block, a chuck means carried by said chuckspindle for engaging one end of the work, a rectangular cam-head on said spindle, a depending bracket arm carried by said punching-means, a pivoted spring positioned trip-dog at the lower free end of said bracket arm adapted upon the descent of said punching means to engage said rectangular camhead to turn the same to produce a limited rotative effect upon said chuck-spindle and the work preparatory to each punching operation, means for producing longitudinal shifting movements of said chuck-spindle and the work alternately in opposite directions simultaneously with each rotative movement of said chuck spindle, comprising a cam-groove formed in the external surface of said chuck-spindle, and a stationary pin connected with said bearing block and engaged in said cam-groove.

a. In a device of the kind described, a vertically reciprocating punching means, an anvil-block having means for alining and supporting the work beneath said punching.

means, a combined clamp and stripper plate extending across said anvil-block, means engaging one marginal side of said plate upon which the same rocks, means operated by the descending punching means for depressing said plate into clamping engagement with the work, spring tensioning means between said plate and said depressing means, and spring pressed push-pins for raising said plate upon the release of said depressing means.

5. In a device of the kind described, a vertically reciprocating punching means, an anvil-block having means for alining and supporting the work beneath said punching means, a combined clamprand stripper plate extending across said anvil-block, means engaging one marginal side of said plate upon which the same rocks, means operated by the descending punching means for depressing said plate into clamping engagement with the work, spring tensioning means be tween said plate and said depressing means, spring pressed push-pins for raising said plate upon the release of said depresslng means, and means for automatically shifting the work on said anvil-block prior to the operation of said clamp and stripper plate.

6. In a device of the kind described, a vertically reciprocating punching means, an anvil-- lock having means for alining and supporting the work beneath said punching means, a combined clamp and stripper plate extending across said anvil-block, means engaging one marginal side of said plate upon which the same rocks, means operated by the descending punching means for depressing said plate into clan'iping engagement with the work, spring tensioning means between said plate and said depressing means, spring pressed puslrpins for raising said plate upon the release of said depressing means, a rotatable chuck-spindle having chuck means for engaging one end of the work, and means operated by the descent of the punching means for producing a limited rotation oi said chuck-spindle'and the workprior to each punchingoperation.

7. In a device of the kind described, a vertically reciprocating punching means,an anvil-block having means for alining and supporting the work beneath said punching means, a combined clamp and stripper plate extending across said anvil-block, means en gaging one marginal side of said plate upon which the same rocks, means operated by the descending punching means for depressing said plate into clamping engagement with the work, spring tensioning means between said plate and said depressing means, spring pressed push-pins for raising said plate upon the release of said depressing means, a rotatable chuck-spindle having chuck means for engaging one end of "the work, means operated by the descent of the punching means for producing a limited rotation of said chuck-spindle and the work prior to each punching operation, and means for producing longitudinal shitting movements of said chuck-spindle and the work alternately in opposite directions simultaneously with each rotative movement of said chuck spindle.

8. In a device of the kind described, a vertically reciprocating punching means, an anvil-block having means for alining and sunoortim the work beneath said punching means, a combined clamp and stripper plate extending across said anvil-block, means engaging one marginal side of said plate upon which the same rocks, means operated by the descending punching means for de pressing said plate into clamping engagement with the work, spring tensioning means between said plate and said depressing means, spring pressed push-pins for raising said plate upon the release of said depress ing means, a bearing block, a chuck-spindle journaled in said bearing block, a chuck means carried by said. chuck-spindle for e11- gaging one end of the work, a rectangular cam-head on said spindle, a depending bracket arm carried by said punching means, and a pivoted spring positioned trip-dog at the lower free end of said bracket arm adapted upon the descent of said punching means to engage said rectangular cam-head to turn the same to produce a limited rotative effect upon said chuck-spindle and the work preparatory to each punching opera tion.

9. In a device of the kind described, a vertically reciprocating punching means, an anvil-block having means for alining and supporting the work beneath said punching means, a combined clamp and stripper plate extending across said anvil-block, means engaging one marginal side of said plate upon which the same rocks, means operated by the descending punching means for depressing said plate into clamping engagement with the Work, spring tensioning means be tween said plate and said depressing means, spring pressed push-pins for raising said pl ate upon the release of said depressing means, a bearing block, a chuck-spindle journaled in said bearing block, a chuck means carriedby said-clmck-spindle for engaging one end of the work, a rectangular cam-head on said spindle, a depending bracket arm carried by said punching means, a pivoted spring positioned trip-dog at the lower free end of said bracket-arm adapted upon the descent of'said punching means to engage said rectangular cam-head to turn the same to produce a limited rotative efi'ect upon said chuck-spindle and the work preparatory to each punching operation, and means for producing longitudinal shifting movements of said chuck-spindle and the work alternately in opposite directions simultaneously with each rotative movement of said chuck spindle.

10. In a device of the kind described, a vertically reciprocating punching means, an anvil-block having means for alining and supporting the work beneathsaid punching means, a combined clamp and stripper plate extending across said anvil-block, means engaging one marginal side of said plate upon which the same rocks, means operated by the descending punching means for depressing said plate into clamping engagement with the work, spring tensioning means between said plate and said depressing means, spring pressed push-pins for raising said plate upon the release of said depressing means, a bearing block. a chuck-spindlejournaled in said bearing block, a chuck means carried by said chuck-spindle for engaging one end of the work, arectangular cam-head on said spindle, a depending bracket arm carried by said punching means, apivoted spring positioned trip-dog at the lower free end of said bracket-arm adapted upon the descent of said punching means to engage said rectangular can't-head to turn the same to produce a limited rot ative eflect upon said chuckspindle and the work preparatory to each punching operation, and means for producing longitudinal shifting movements of said chuck-spindle and the work alternately in opposite directions simultaneously with each rotative movement of said chuck spindle, comprising a can't-groove formed in the external surface of said chuck-spindle, and a stationary pin connected with said bearing block and engaged in said cam-groove.

11. In a device of the kind described, a vertically reciprocating punching means, means for supporting the work in alinement with said punching means, a bearing block, t chuck-spindle journa-led in said bearing block having a conical seat in its outer end, an internal shoulder in the rear of said seat. a split tubular chuck-sleeve. chuck-jaws at the outer end of said chuck-sleeve having conical back-portions engaged upon said conical seat, a tubular tail-member connected with the inner end of said chucksleeve and extending outwardly from the. opposite end of said chuck-spindle, and a compression. spring between said internal shoulder and the inner end of said tail member.

12. In a device of the kind described. a, vertically reciprocating punching means, means for supporting the work in alineinent with said punching means, a bearing block. a chuck-spindle journaled in said bearing block having a conical seat in its outer end, an internal shoulder in the rear of said seat, a split tubular chuck-sleeve. chuck-jaws at the outer end of said chuck-sleeve having conical back-portions engaged upon said conical seat, a tubular tail-member connect ed with the inner end of said chuck-sleeve and extending outwardly from the opposite end of said chuck-spindle, and a compression spring between said internal shoulder and the inner end of said tail member, said chuck-jaws yielding to the outward movement of the wor: therethrough, means operated by the descent of said punching means for producing a. limited rotation of said chuck-spindle in one direction. and a pivoted stoppawl connected with said hearing block for preventing rotation of said chuck-spindle in the opposite direction.

13. In a device of the kind described, :1 vertically reciprocating punching moans, means for supporting the work in alinement with said punching means, a bearing block, a chuck-spindle j ournaled in said bearin block having a conical seat in its outer end, an internal shoulder in the rear of said seat, a split tubular chuck-sleeve, chuck-jaws at the outer end of said chuck-sleeve having conical back-portions engaged upon said conical seat, a tubular tail-member connected with the inner end of said chuck-sleeve and extending outwardly from the oppo ite end oi said chuck-spindle, a compression spring beintense tween said internal-shoulder and the inner end of said tail member, said chuck-jaws yielding to the outward movement of the work therethrough, means operated by the descent of said punching means for producing a limited rotation of said chuck-spindle in one direction, and a pivoted stop-pawl connected with said bearing block for pre venting rotation of said chuck-spindle in the opposite direction, and means for producing longitudinal shifting movements of said chuck spindle alternately in opposite directions simultaneously with each rotative movement of said chuck-spindle.

14. In a device of the kind described, a vertically reciprocating punching moans, means for supporting the work in alinement with said punching means, a bearing block, a chuck-spii'idle journaled in said bearing block having a conical seat in its outer end, an internal shoulder in the rear of said seat, a split tubular chuck-sleeve, chuck-jaws at the outer end of said chuck-sleeve having conical back-portions engaged upon said conical seat, a tubular tail-member connected with the inner end of said chuck-sleeve and extending outwardly from the opposite end of said chuck-spindle, a compression spring between said internal shoulder and the inner end of said tail member, said chuck-jaws yielding to the outward movement of the work therethrough, a rectangular cam-head on said chuck-spindle, a depending bracket arm carried by said punching means, and a pivoted spring positioned trip-dog at the lower free end of said bracket-arm adapted upon the descent of said punching means to engage said rectangular cam-head to turn the same to produce a limited rotative elfect upon said chuck-spindle preparatory to each punching operation. a

15. In a device of the kind described, a vertically reciprocating punching means, means for supporting the work in alinement with said punching means, a bearing block, a chuck-spindle journaled in said bearing block having a conical seat in its outer end, an internal shoulder in the rear oi said seat, a split tubular chuck -sleeve, chuck-jaws at the outer end of said chuck-sleeve having conical back-portions engaged upon said conical seat, a tubular tail-member connected with the inner end of said chucksleeve and extending outwardly from the opposite end of said chuck-spindle, a compression spring between said internal shoulder and the inner end of said tail member, said chuck-jaws yielding to the outward. movement of the work therethrough, a rectangular cam-head on said chuck-spindle, a depending bracket-arm carried by said punching means, a pivoted spring positioned trip-dog at the lower free end of said bracket-arm adapted upon the descent of said punching means to engage said rectangular cam-head to turn the same to produce a limited rotative effect upon said chuckspindle preparatory to each punching oper ation, and means for producing longitudinal shitting movements of said chuck-spindle and the work alternately in opposite directions simultaneously with each rotative movement of said chuck-spindle.

16. In a device of the kind described, a vertically reciprocating punching means, means for supporting the work in alinement with said punching means, a bearingblock, a chuck-spindle journaled in said bearing block having a conical seat in its outer end, an internal shoulder in the rear of said seat, a split tubular chuck-sleeve, chuck-jaws at the outer end of said chuck-sleeve having conical back-portions engaged upon said conical seat, a tubular tail-member connected with the inner end of said cliuclcslceve and extending outwardly from the opposite end of said chuck-spindle, a compression spring between said internal shoulder and the inner end of said tail member, said chuck-jaws yielding to the outward movement of the work therethrough, a rectangular cam-head on said cluick-spindle, a depending bracketarm carried by said punching means, a pivoted spring positioned trip-dog at the lower free end of said bracketarm adapted upon the descent of said punching means to engage said rectangular cam-head to turn the same to produce a limited rotative effect upon said chuck-spindle preparatory to each punching operation, and means for producing lon 'itudinal shitting movements of said chuck 'pindle and the work alternately in opposite directions sirmiltaneously with each rotative movement of said chuck-spindle, comprising a cam-groove formed in the external surface of said chuck-spindle, and a stationary pin connected with said bearing block and engaged in said cam-groove.

17. In a device oi? the kind described, a vertically reciprocating punching means, means for supporting the work in aliuement with said punching means, a bearing block, a chuck-spindle journaled in said bearing block having a conical seat in its outer end, an internal shoulder in the rear of said seat, a split tubular chuck-sleeve, chuck-jaws at the outer end of said chuck-sleeve having conical back-portions engaged upon said conical seat, a tubular tail-member connected with the inner end of said chuclesleeve and extending outwardly from the opposite end oi? said chuck-spindle, compression spring between said internal shoulder and the inner end of said tail member, said chuck-jaws yielding to the outward movement of the work therethrough, a rectangular cam-head on said chuck-spindle, a dependingbracket arm carried by said punching means, a pivoted spring positioned -trip-dog at the lower free end of said bracketarmadapted upon the descent of said punching means to en gage said rectangular cam-head to turn the same to produce a limited rotative effect upon said chuck-spindle preparatory to each punching operation, and means for produc ing longitudinal shifting movements of sald chuck-spindle and the work alternately .in opposite directions simultaneously with each rotative movement of said chuck-spindle, comprising a cam-groove formed in the ex ternal surface of said chuck-spindle, and a stationary pin connected with said bearing block and engaged in said cam-groove, and means operated by the descent of said punching means for clamping the work on said supporting means.

18. In a device of the kind described, a vertically reciprocating punching means, means for supporting the work in alinement with said punching means, a bearing block, a chuck-spindle journaled in said bearing block having a conical seat in its outer end, an internal shoulder in the rear of said seat, a split tubular chuck-sleeve, chuck-jaws at the outer end of said chuck-sleeve having conical back-portions engaged upon said conical seat, a tubular tail-member connected with the inner end of said chuck-sleeve and extending outwardly from the opposite end of said chuck-spindle, a compression spring between said internal shoulder and the inner end of said tail member, said chuck-jaws yielding to the outward movement of the work therethrough, means operated by the descent of said punching means for producing a limited rotation of said chuck-spindle in one direction, a pivoted stop-pawl c011- nected with said bearing block forpreventing rotation of said chuck-spindle in the opposite direction, and means operated by the descent of said punching means for clamping the work on said supporting means.

19. In a device of the kind described, a

vertically reciprocating punching means,

means for supporting the work in alinement with said punching means, a bearing block, a chuck-spindle journaled in said bearing block having a conical seat in its outer end, an internal shoulder in the rear of said seat, a split tubular chuck-sleeve, chuck-j aws at the outer end of said chuck-sleeve having conical backportions engaged upon said conical seat, a tubular tail-member connected with the inner end of said chuck-sleeve and extending outwardly from the opposite end of said chuck-spindle, a compression spring between said internal shoulder and the inner end of said tail member, said chuck-jaws yielding to the outward movement of the work therethrough, a rectangular cam-head on said chuck-spindle, a depending bracketarm carried by said punching means, a pivoted spring positioned trip-dog at the lower free end of said bracket-arm adapted upon the descent of said punching means to en gage said rectangular cam-head to turn the same to produce a limited rotative eifectupon said chuck-spindle preparatory to each punching operation, and means operated by the descent of said punching means for clamping the work on said supporting means.

20. In a device of the kind described, a vertically reciprocating punching means, an anvil-block having means for alining and supporting the work beneath said punching means, a combined clamp and stripper plate extending across said anvil-block, means engaging one marginal side of said plate upon which the same rocks, means operated by the descending punching means for depressing said plate into clamping position, spring tensioning means between said plate and said depressing means, spring pressed push-pins for raising said plate upon the release of said depressing means, a bearing-block, a chuck-spindle ournaled in said bearingblock having a conical seat in the outer end, an internal shoulder in the rear of said seat, a split tubular chuck-sleeve, chuck jaws at the outer end of said chuck-sleeve having conical back-portions engaged upon said conical seat, a tubular tail=member connected with the inner end of said chuck-sleeve and extending outwardly from the opposite end of said chuck-spindle, a compression spring between said internal shoulder and the inner end of said tail-member, said chuck-jaws yielding to the outward movement of the work therethrough, a rectangular cam-head on said chuck-spindle, a depending bracket arm carried by said punching means, and a pivoted spring positioned trip-dog at the lower end of said bracket-arm adapted upon the descent of said punching means to engage said rectangular cam-head to turn the same to produce a limited rotative effect upon said chuck-spindle preparatory to each punching operation.

21. In a device of the kind described, a vertically reciprocating punching means, an anvil-block having means for alining and supporting the work beneath said punching means, a combined clamp and stripper plate extending across said anvil-block, means engaging one marginal side of said plate upon which the same rocks, means operated by the descending punching means for depressing said plate into clamping position, spring tensioning means between said plate and said depressing means, spring pressed pushpins for raisin said plate upon the release of said depressing means, a bearing-block, a chuck-spindle journaled in said bearing block having a conical seat in its outer end, an internal shoulder in the rear of said seat, a split tubular chuck-sleeve, chuck-jaws at the outer end of said chuck-sleeve having conical back-portions engaged upon said pression spring between said internal shoul der and the inner end of said tail-member, said chuckaws yieldin to the outward movement of the work t erethrough, a rectangular cam-head on said chuck-spindle, a

depending bracket arm carried by said punching means, a pivoted spring positioned trip-dog at the lower end of said bracket-- arm adapted upon the descent of said punching means to engage said rectangular ca1nhead to turn the same to produce a limited rotative effect upon said chuck-spindle preparatory to each punching operation, and means for producing longitudinal. shifting movements of said chuck-spindle and the work alternately in opposite directions simultaneously with each rotative movement of said chuck spindle.

22. In a device of the kind described, a vertically reciprocating punching means, an anvil-block having means for alining and supporting the Work beneath said punching means, a combined clamp and stripper plate extending across said anvil-block, means engaging one marginal side of said plate upon which the same rocks, means operated by the descending punching means for depressing said plate into clamping position, spring tensioning means between said plate and said depressing means, spring pressed pushpins for raising said plate upon the release of said depressing means, a bearing-block, a chuck-spindle journaled in said bearing block havmg a conical seat in its outer end,

Copies oil? this patent may be obtained for an internal shoulder in the rear ofsaid seat, a split tubular chuck-sleeve, chuck-jaws at the outer end of said chuck-sleeve havin conical back-portions engaged u on sai conical seat, a tubular tail-mom er con nected with the inner end of said chucksleeve and extending outwardly from the opposite end oi said chuck-spindle, a compression spring betweensaid internal shoulder and the inner end of said tail-member, said chuck-jaws yielding to the outward movement of the work therethrough, a rectangular can1-head on said chuck-spindle, a depending bracket arm carried by said punching means, a pivoted spring positioned trip-dog at the lower end of said bracketarm adapted upon the descent of said punching means to engage said rectangular camhead to turn the same to roduce a limited rotative effect upon said muck-spindle preparatory to each punching operation, and means for producing longitudinal shifting movements of said chuck-spindle and the work alternately in opposite directions simultaneously with each rotative movement of said chuck spindle, comprising a cam-groove formed in the external surface of said chuck-spindle, and a stationary pin connected with said bearing block and engaged in said canrgroove.

In testimony that l claimthe invention set forth above l have hereunto set my hand this 13th day of March, 1918.

ERNEST LOESSER.

Witnesses:

Gnonon l), RIOHARDs, -FREDK. H. W, FRAENTZEL.

five cents each, by addressing the fiommiaaioner of Patents,

Waahington, D. G,

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