US1035095A

US1035095A - Punching-machine.

Info

Publication number: US1035095A
Authority: US
Inventors: Hans B Kraut
Original assignee: Joseph T Ryerson and Son Inc
Current assignee: Joseph T Ryerson and Son Inc
Priority date: 1910-12-30
Filing date: 1910-12-30
Publication date: 1912-08-06
Anticipated expiration: 1929-08-06

Description

H. B. KRAUT.

PUNGHING MACHINE.

APPLICATION FILED 111:0. a0, 1910.

Patented Aug. 6, 1912.

a BHEBTSBHIIET 1.

' H. B. KRAUT. PUNOHING MACHINE.

APPLICATION FILED DBO. 30, 1910.

Patented Aug. 6, 1912.

3 SHEETBBHEET 2.

' INVENTOH flrmfifiazaf a? J4 J 6 wrmsssssj? H. B. KRAUT. PUNOHING MACHINE. APPLICATION FILED DBO. 30, 1910.

Patented Aug. 6, 1912.

w WINVENTOR flzbzafijfizzzzf W) g w vy v UNITED STATES PATENT omj fl HANS B. KRAFT, OF CH-I CAGO, ILLINOIS, ASSIGNOR TO JOSEPH T. RY'ERSON & SON, OF CH'IGAGO, ILLINOIS, A CORPORATION OF ILLINOIS. I

romaine-MACHINE.

Specification of Letters Patent.

Patented na 6,1912.

To all whom itmay concern."

Be it known that I, HANS B. KnAU'r, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Punching-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being bad tothe accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in punching machines and refers to the mechanism for operating the punch, to novel features of construction in the punch bolster and the gage to adapt the machines to operate on different rolled shapes, and also to other improvements in machines, as w1ll hereinafter more fully appear.

Certain features of the invention are particularly adaptable to a hand unchlng machine, while others are adapta le as well to power machines.

Among the objects of the invention is to provide an improved hand actuated mechanism for the punch, arranged to adapt the machine to operate upon materials of varying thicknesses.

A further object of the invention is to provide improvements in the operating shaft for the punch slide and the means for mounting the same in the frame, arranged to permit the parts to be readily dismounted from the machine for the purpose of replacement or repair.

A further object of the invention is to provide an improved reversible bolster, arranged to adapt the machine to operate on the various parts of the flanges or webs of rolled shapes, and to provide a reversible gage to cotiperate with the reversible bolster, and to provide an adjustment of the punch mounting to correspond with the adjustments of the bolster.

A further object of the invention is to provide a novel form of stripper adapted to machines of this and other types.

Other ,objects of the invention are to improve and simplify the details of the machine, and the invention consists in the matters hereinafter set forth and more particularly pointed out in the appended claims.

In the drawings,-Figure 1 is a front clevation of a hand punching machine embodying my invention. Fig. 2 is a partial transverse vertical section and elevation, the section being taken on line 2-2 of Fig. 3. Fig. 3 is a side elevation of the machine.

Figs. 4, 5, 6 and 7 are sections on the lines 44, 5-5, 66 and 7-7, respectively, of Fig. 3. Fig. 8 is a partial sectional view and partial elevation, the section being taken on line 8-8 of Fig. 4.

The frame of the machine comprises, in general terms, the

outer plates

10, 10 and 10 and inter osed filler plates 11, 11, three of the latter eing shown, all of which extend from the to to the base of the machine, and are rigidly fixed together by the

rivets

12, 12 and

pins

13, 13. Said pins are applied in the manner described in my prior application for United States Letters Patent, Serial Number 578,388, filed August 22d, 1910. At the base of the machine are riveted two angle bars '14, 14 to constitute a suitably wide frame supporting base. The said plates are cut away at the front of the machlnc to provide the forwardly o ening throat 16, and below said throat a WOlSftil 17 is supported on the frame. The bolster is of novel construction, as hereinafter described. The lower part of the frame below the throat is made somewhat shorter than the upper part thereof above the throat, thereby giving to the upper part of the frame an overhanging effect. The filler plates 11 terminate short of the front margins of the

side plates

10 and 10 above the throat to provide a chamber between the latter plates at the front of the machine to receive the punch carrying and operating mechanism. Said upper, overhanging part of the frame carries the punch 18 and its carrying and operating mechanism, and said punch cooperates with the

die holders

19, 20 on the bolster 17. The punch is operated by a hand actuated mechanism which embraces features of novelty and is made as follows 22 designates ashort, rotative horizontal shaft that is mounted in

bearing bushings

23, 23 fixed in the

side plates

10, 10 of the machine, and extends across the chamber be tween said plates. The plate 10 is a removable part of the frame plate at the lefthand side of the-machine for a purpose hereinafter described. The said shaft 22 is provided with an eccentric 25, which is herein shown as, and preferably is, made an integral part of the shaft. Said eccentric engages a bearing opening in a pitman 26, shown best in Fig. 8, that is mounted within a suitably shaped opening 27 in a vertically reciprocating punch carrying slide 28 arranged in the chambered portion of the frame and having guiding engagement at screws 30, Figs. 3 and 8. The removable mounting of the plate 10 permits the eccentric to be made integral with the shaft and at the same time permits said shaft to be readily dismounted from the machine when said plate 10 is removed or detached. Such detachment of the plate 10 is effected by withdrawing the screws and 30. The lower headed end of the pitman 26 engages a hard metal bearing block 31 fitted in the punch slide, the head being interfitted with the slide and bearing block to positively raise-the slide.

Keyed or otherwise secured to the shaft 22 just outside the plate 10 is a disk 33 which is provided throughout a port-ion of its periphery with a series of ratchet teeth 34, and at another part of its periphery with a pair of notches 35. Rotatively mounted on said shaft just outside the ratchet wheel is a swinging lever 36, the hub 37 of which is formed with a mutilated gear 38 which meshes with a forwardly facing curved rack 40 formed on the forward end of a swinging arm 41 at the right hand side ofthe machine that is pivoted to a stud 42 which extends through the machine frame and is held therein by the nut 43. A spacing sleeve 44 is interposed between the lever and the adjacent frame plate of the machine. Said shaft 22 is held in place in the machine by means of

nuts

45, 45 screwthreaded to the reduced ends thereof and bearing-against the

washers

46, 46 which are interposed between saidnuts and shoulders on the shaft.

The hand lever 36 is provided with a suitable extension 48 and is free toswing or rotate on the shaft 22. Pivoted to said hand 'levleriis a pawl 49 which is provided with a tooth 50 adapted to engage the notches 35,

35 .of the disk 33. VVhensaid dogis thus engaged with the notched disk and the hand lever is swung forwardly, power is trans- The machine is operated with this adjustment for continuous punching, or when the material being operated upon is sufficiently thin to permit the punch to be forced through the material with a continuous operation of the punch operating mechanism with the direct power afforded by the direct connection of the hand lever to said disk. The pawl 49 is held engaged with the notches 35 by means of a leaf spring 51 fixed to the lever 36, which engages a flat face 52 of the hub of the pawl, as'indicated in dotted lines in Fig. 3. Thesaid hub of the pawl is provided with a second fiat face 52 adapted to be engaged by the leaf spring when the pawl is thrown upwardly out of engagement with the notched disk to hold said pawl in its released position;

When operating upon thicker material through which the punch cannot be forced by'the directly applied power, as described, I employ the lever 41 with the attachments described, to provide a compound lever action to exert greater force on the punch slide or carrier to force the punch to its work. For this purpose I may employ a push pawl 54 which is pivoted at 55 to the lever 41, near the fulcrum of the latter, said pawl being provided with a tooth to engage the ratchet teeth 34 of the disk 33. VVhenthe lever 41 is employed to transmit punching power to the punch slide, the pawl 49 is released from the disk, or thrown upwardly, and the pawl 54 is engaged with the ratchet teeths34 of said disk. Upon swinging the hand lever forwardly, with this adjustment, the lever 41 is swung upwardly, by-

reason of its meshing engagement with the hub 37 of the hand lever, and acts, through the pawl 54, to turn the disk and the operating' shaft at a reduced speed, as compared to the direct operation described, and topress the punch to its work with greater power. The said disk is held from turning backwardly by means of a dog 58 which is fixed to a rock shaft 59 that extends through the machine frame, below the eccentric shaft 22, and is provided on the side of the frame, opposite said dog, with a lever arm 60. The said dog 58 is normally held engaged with the ratchet teeth of the disk by means of a leaf spring 61 fixed to the machine frame and bearing against a fiat face of the hub of the dog. Said spring also serves, when the dog is thrown backwardly away from the disk, through the action of the lever arm 60,.

plication of again] thrown ackwardly to swing the sup- Similarly, when-operating with the direct a the eccentric shaft and the punch slide in the position in which they have been depressed. It is obvious that the arrangement shown produces a compounded leverage for depressing the punch which acts much more powerfully than the direct lever connection described to force the punch through the work. If the material being operated upon is so thick as to necessitate the impressment of additional power to force it through the work, or to require two or more stages of apower, the hand lever 36 is plemental lever 41 downwardly, and thereby carry the page-1'54 downwardly into engag'ement with flower tooth of theratchet disk, and upon again swinging the lever forwardly the parts will act 1n the manner before described to depress the tool a farther distance. Such successive impressments of power upon the tool to force it through the work may be repeated as often as is necessary to complete the punching operation.

leverage afforded through the pawl 4-9 and disk 33, the punch may be forced through the work by two stages of impressment of power, the dog 58 holding the parts to the position to which they have been forced.

When the pawl 49 is engaged with the notched disk, as indicated in dotted lines in Fig. 3, to act directly on the disk to transmit the punching pressure to the slide, the pawl 54 and dog 58 may be swung backwardly to the dotted line position indicated in Fig. 3 to prevent them from rattlin against the ratchet teeth of the disk, unless the dog he required to prevent retraction of the disk. Also when the parts are adjusted for the compound lever effect, the pawl 49 will be lifted out of engagement from the notches35 of the disk, as shown in full lines in Fi 3.

' ing side flanges .66, 66, (Figs. 1, 2 and 7) Referring now to the construction of the reversible bolster 17 and to the manner of supporting the same on the frame whereby it may be reversed end to end thereon, the same is made as follows :Said bolster embraces an upwardly facing horizontal plate or member 65, and two downwardly extendthe upper member resting on the frame plates below the throat and the flanges fitting outside of and overlapping the side frame plates 10. The upper member of the bol'ster is provided at one end with the comparatively low or shallow die holder 19 and is provided at its other end with the relatively higher die holder 20. The bolster is attached to the frame by the screw bolts 68 which extend'loosely through horizontally elongated openings in the flanges 66 and into screw-threaded openings in the frame (Fig. 6), and set screws 69 which are screwthreaded in openings in said flanges and bear at their inner ends against the side. plates 10 of the frame. The said flanges 66 are spaced a distance apart slightly greater than'the distance between the outer faces of the frame plates 10, so that, by proper nm- 70 nipulation of the screw bolt: 68 and set operative die holder thereof laterally into line with the punch. Further, by reason of the elongated openings in the flanges 66 through which the screw bolts 68 extend, said bolster, when the set screws 69 are released or turned backwardly, may be shifted longitudinally of the frame to properly adjust 'the operative die holder to the punch.

By reason of the detachable connection of the bolster with the frame, said bolster may be reversed end to end to present either of the die holders to the punch. The bolster will be adjusted to present the lower die holder 19 to the punch when punching thin plates or the flanges of I, T or angle beams or bars. When punching the webs of T- bars, channel bars and like rolled shapes, the bolster will be reversed end to end from the position shown in Fig. 3 to present the higher die holder to the punch, said higher die holder providing spacelielow the same for the flanges of such rolled shapes when punching the webs thereof. The machine, when provided with such a reversible bolster, will also desirably be provided with a reversible gage, indicated as a whole by 72, which is adapted to be reversed or mounted 100 tocorrespond to the reversed positions of the said bolster. The gage 72 is of general U-form, it comprising the

horizontal side members

73, 73 and a closed end member 74, on which latter is formed the gaging face of the gage. Said side members 'fit against the side plates 10 of the machine and are provided with slots 75 through which attaching or holding screws 76 extend to hold the gage in place, and to ermit the same to be ad usted toward and rom the punch. The closed end portion of the U-shaped gage is made considerably narrower than the rear ends of the side bars thereof, so as to bring the gaging face thereof in the plane of the side margins of said bars at one side of the gage, but to space said gaging face a distance from the opposite side margins of said arms. When, therefore, said gage is adjusted to the position shown in Figs. 1, 2 12d and 3, said closed gaging face lies upon the upper face of the bolster so as to properly contact with and gage thin sheet material or the flanges of rolled shapes which are being operated upon. This adjustment is effected when operating with the lower die holder 19. By releasing the holding bolts 76 and reversing the gageupsidedown, the closed, narrow end or gaging face of the gage will be raised adistance above the sented to the cooperatin work, which is raised above thehorizontal part 65 of the bolster may be properly pre end of the gage. The slotted connection 0 the gage with the machine enables the gage to be adjusted to-.

ward and from the punch, and when the gage is reversed from the position shown 1n Fig. 3 with its closed end above the bolster,

said closed narrower end of the gage may verlap the higher die holder to gage work that is to be punched close to the edge of the material. The reversible bolster and reversible gage provide means in the various adjustments thereof for properly presenting and gaging various rolled shapes to the tool, as will be obvious to one skilled in this art. f

WVhen the bolster is adjusted with its lower or shorter die holder presented to the punch, said punch may be mounted in a socketed extension 77 having a shank 78 which fits in the socket 7 9 of the tool slide. When said bolster is presented with its higher die holder to the tool, the said socketed extension may be omitted and the shank ofthe punch engaged directly with the tool socket of the slide.

Next referring to the stripper, the same comprises a U-shaped, horizontally arranged member 80 which embraces the forward side of the frame of the machine, above the throat, and downwardly extending

stripper fingers

81, 81 which are attached at their upper ends to the rear ends of the U-shaped bar and are bent inwardly at their lower ends to pass into the side members of the gage. The said stripperfingers 81 are provided with vertical slots 82 through which extend the screw bolts 83 by which the stripper is attached to the frame. Said slots permit the stripper to be adjusted vertically with respect to the punch to correspond to the adjustment of the reversible bolster, the

stripper being adjusted to a lower position when the lower die holder of the bolster is presented to the punch, and to a higher position when the higher bolster die holder is presented to the punch.

It is manifest that the structural details of the invention may be varied from the illustrated embodiment herein shown within the spirit and scope of the invention and that the invention is not limited to the specific details and combinations illustrated, except as hereinafter made the subject of specific claims.

I claim as my invention 1. In a hand punching machine, the combination with a frame, a tool carriefguidingly mounted therein to carry a tool, a pitthe pitman to actuate it and the said carrier, a disk fixed to the eccentric shaft, a'pivoted hand lever having-means to connect it with the disk to operate the Earrier, and a second a disk fixed to the eccentric shaft provided with a series of ratchet teeth and with a notch, a pivoted hand lever, a pawl on the hand lever adapted to releasably engage said notch, a second lever pivoted to the frame and geared to the hand'lever, a pawl pivoted to the second lever for. engagement with said ratchet teeth, and means for holding the ratchet from backward rotation.

3. In a hand punching machine, the combination with a frame, a tool carrier guidingly mounted therein to carry a tool, a pitman connected with the carrier, an eccentric shaft mounted in the frame and engaging the pitman to actuate it and the said carrier, a disk" fixed to the eccentric shaft and provided with a series of ratchet teeth and with a notch, a hand lever swingingly mounted on said shaft, a pawl on the hand lever adapted to releasably engage said notch, said hand lever being provided at its pivoted end with gear teeth, a second lever pivoted near one end thereof to the frame and provided at its other end with a rack engaging the teeth of the hand lever, a pawl pivoted to the second lever near the pivot of the latter to engage with the ratchet teeth, and a holding dog pivoted to the frame to engage the ratchet teeth and hold the disk from backward rotation.

4:. In a hand punching machine, the combination with a' frame, a-tool carrierguidingly mounted therein to carry a tool, a pitman connected with the carrier, an eccentric shaft mounted in the frame and engaging the pitman'to actuate it and the sald carrier, a disk fixed to the eccentric-shaft and provided with a series of ratchet teeth and with a notch, a hand lever swingingly mounted on said shaft, a pawl on the hand lever adapted to releasably engage said notch, said hand lever being provided at its pivoted end with gear teeth, a second lever pivoted near one end thereof to the frame the ratchet teeth and hold the disk from backward rotation, said dog being fixed to a rock shaft which extends through the machine frame, and a lever arm fixed to the rock shaft to swing the dog out of engagement with the ratchet teeth.

5. A punching machine comprising a frame having a chamber to receive a tool carrier guidingly mounted in said chamber, a

m pitman connected with the tool slide and provided with a bearing opening for an eccentric, a shaft extending through said chamber and rotati'vely mounted in the frame and provided with an integral eccentric to engage the pitman bearing opening,

one side of the frame WhlCh carries one of the bearings for the shaft being detachably nxed in place, whereby upon removal of the detachable frame piece the eccentric shaft may be removed endwise from the frame, and means operatively connected to the shaft for operating the pitman and carrier.

6. A punching machine comprising a frame composed of side plates wlth an intermediate filler, and having a chamber to receive a tool carrier, one of the frame lates at the side of the chamber being detac ably fixed in place, a tool carrier guidingly mounted in said chamber, a pitman connected to the carrier and provided with a bearing opening for an eccentric, a shaft extend ing through said chamber and rotatively mounted in the fixed and removable side plates and provided with an integral eccentric to engage the pitman bearing opening, whereby, upon detachment of the detachable side late, the eccentric shaft may be removed endwise from the frame, said shaft extending at one end beyond the frame, and means mounted on the extended end 'of the shaft for rotating the same and actuating the tool carrier.

7. A punching machine comprising a frame composed of side plates with an intermediate filler, and having a chamber to receive a tool carrier, one of the frame lates at the side of the chamber being detac ab? fixed in place, a tool carrier guiding y mounted in said chamber, a itman con- 5 nected to the carrier and provided with a bearing opening for an eccentric, a shaft extending through said chamber and rotatively mounted in the fixed and removable side plates and provided with an integral eccentric to engage the pitman bearing opening, whereby, upon detachment of the detachable side plate, the eccentric shaft may be removed endwise from theframe,

, said shaft extending at one end beyond the frame, a notched disk fixed to the extended end of the said shaft, and a hand lever pivoted to said extended end of the shaft and having means for operatively connecting the same with the notched disk.

8. A punching machine comprising a frame composed of side plates with an intermediate filler, and having a chamber to receive a tool carrier, one of the frame plates at the side of the chamber being detachably fixed to the filler, a plate extending between and detachably fixed to the forward margins of said side plates, to constitute one wall of said chamber, a tool carrier guidingly mounted in said chamber, a pitman connected to the carrier and provided with a bearing opening for an eccentric, a shaft extending through said chamber and rotatively mounted in the fixed and detachable side plates and provided with an integral eccentric to engage the itman bearing opening, said shaft extending at one end beyond the frame, and means mounted on sald extended end of theshaft forrotating the same and actuating the tool carrier.

9. A hand punching machine comprising a frame composed of side plates and an intermediate filler, the latter terminating short of the front margins of the side plates to constitute a chamber to receive the tool carrier, one of the side plates at the chamber being detachably fixed t0 the filler, a plate extending across and detachably fixed to the front margins of the side plates to constitute the front wall of the carrier chamber, a tool carrier guidingly mounted in said chamber and provided with an opening to receive a pitman, a pitman in said opening and connected with the carrier and havin a bearing opening for an eccentric, a sha t rotatively mounted in the fixed and detachable side plates and provided with an integral eccentric to engage the bearing opening of said pitman, said shaft extending at one end beyond the frame, and means mounted on the extended end of the shaft for actuating said shaft and the tool carrier.

10. In a punching machine, the combination with a frame provided with a throat and with means above the throat for supporting and operating a punch, of a bolster supported on the frame below the throat and provided at its opposite ends with upwardly exposed tool dies of different heights, and means for attaching the bolster to the frame, arranged to permit the bolster 5 to be reversed end to end to present either of said tool dies to the punch.

11. In a punching machine, the combination with a frame provided with a throat and with means above the throat for sup- 120 porting and operating a punch, of a bolster supported on the frame below the throat and provided at its 0 posite ends with upwardly exposed too dies of different heights, means for attaching the bolster to the frame, arranged to permit the bolster to be reversed end to end to present either of said tool dies to the punch, and means associated with the bolster fastening means constructed to permit lateral and longitudinal adjustment of the bolster on the frame, relatively to the punch.

12. In a punching machine, the combination with a frame provided with a throat. and with means above the throat for sup supported on the frame below the throat and side flanges which lie at the sides of the frame, said horizontal bed being provided at its opposite ends with upwardly exposed tool dies, and means piercing the side flanges of the bolster for attaching the bolster to-the frame, and arranged to permit' the bolster to be reversed end to end to present either of said tool dies to the punch.

13. In a punching machine, the combination with a frame provided with a throat and with means above the throat for supporting and operating a punch, of a bolster comprising a horizontal bed adapted to be supported on the frame below the throat and side flanges which lie at the sides of the frame, said horizontal bed being provided at its opposite ends with upwardly exposed tool dies, said side flanges of "the bolster being. provided with horizontally elongated openings, attaching bolts extending through said openings and into the' frame, and set screws extending through screw-threaded openings in said sideflanges and bearing against said frame, said flanges being spaced a distance apart slightly greater than the width of the frame.

14. In a punching machine, the combina-' tion with a frame, of a bolster provided with means for detachably fixing it to the machine frame and constructed to be reversed thereon end to end, and provided at its opposite ends with upwardly exposed tool dies of different heights.

15. In a punching machine, a bolster comprising a horizontal bed and two depending side flanges pierced to receive attaching means to fasten the bolster to the machine, the bolster bed being provided with upwardly exposed tool dies of different heights.

16. In a punching machine, the combination with. a frame having a throat and provided with meansabove the throat for supporting and operating a punch,' of a bolster attached on the frame below the throat by means permitting endwise reversal of the bolster, and provided at its opposite ends with die holders of different heights, where by upon reversal of the bolster either die holder may be presented to the punch, and

a, gage having means for vertically adjusting the gaging face thereof to correspond to either adjustment of the bolster.

17 In a punching machine, the combination with a frame having a throat and provided with means above the throat for supporting and operating a punch, of a bolster attached on the frame below the throat by means permitting endwise reversal ofthe bolster, and provided at its opposite ends with die holders of difierent heights, whereby upon reversal of the bolster either die holder'may be presented to the punch, and a gage having a narrow gaging face disposed at the plane of the margin of the gage at one side, and means for attaching the gage to the frame, arranged to permit it to be reversed upside down, whereby the gaging face may be adjusted adjacent to the bolster bed to cooperate with the lower die holder, and may be raised from the bolster bed to cooperate with the higher die holder. 18. In a punching machine, the combina tionwith a frame having a throat and provided with means above the throat for supporting and operating a punch, of. a bolster attached on the frame below the. throat by means permitting endwise reversal of the bolster, and provided at its opposite ends with die holders of different helghts, whereby upon reversal of the bolster either die holder may be presented to the punch, a gage having a narrow gaging face disposed at the plane of the margin of the gage at one side and means for attachin to vthe frame, arranged to permit it to be reversed upside down, whereby the gaging face may be adjusted adjacent to thebolster bed to cooperate with the lower die holder, and may be raised from the bolster bed to cooperate with the higher die holder, and means for adjusting said gage on the frame toward and om thepunch.

, 19'. In a punching machine, the combination with aframe having a throat and provided with means abovathe throat for supportingand operating a punch, of a bolster attached on the frame below the throat by the gage means permitting endwise reversal of the bolster, and provided at its opposite ends with die holders of different heights, whereby upon reversal of the bolster either die holder may be presented to the punch, a U-shaped gage, the arms of which lie at the sides of the frame, the .closed portion of which is presented toward the punch, the

said closed portion of the gage being reducedin depth to bring the gaging face thereof in the plane of the margins of the arms at one side of the gage, and to space thegaging face from the opposite margins of said arms,-

and means for attaching the gage to the frame, permitting said gage to be reversed upsidedown.

20. In a hand punching machine, the com bination with a frame provided with n throat and a tool carrier mounted in the frame above the throat, of a bolster sup ported on the frame below the throat by means permitting it to be reversed end to end and provided at its opposite ends. with upwardly exposed tool dies of difl erent heights adapted, by reversal 0f the bolster, to be separately presented to the punch, and a socketed punch extension removabl fitted in the carrler andyremovably receiving the tool, whereby said tool may be supported from the carrier through the medium of said extension, when cooperating with the lower die holder, and may be supported from the, carrier directl when cooperating with the' higher die ho der.

21. In a punching machine, a stripper comcomprising a U-shaped bar, the closed portion of whlch embraces the front of the machine and the arms of which lie at'the sides of the machine, and stripper fingers attached to and depending from-the side arms.

22. In a punching machine, a stripper comprising a U-shaped bar, the closed portion of which embraces the front of the machine and the arms of which lie at "the sides of the machine, and stripper fingers attached to and depending from the, side arms, said stripper fingers being provided with vertically elongated slots, and means extending through the slots for attaching the stripper to'the frame, arranged to permit vertical adjustment of the strippen.

In testimony, that I claim the foregoing as my invention I aflix my signature in the resence of two witnesses, this 21st day of ecember A. 1910. v

HANS B. KRAUT.

Witnesses: I

W. L. HALL, WILLIAM Gownnnonn.