US796488A - Punching-machine. - Google Patents

Description

PATENTED AUG. 8, 1905.

W. G. YEATMAN & C. F. MESSINGER.

PUNGHING MACHINE.

APPLICATION FILED NOV.25, 1901.

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PUNU-HING MACHINE. APPLICATION FILED NOV. 25, 1901.

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UNITED STATES PATENT ()FFICE.

WALTER C. YEATMAN AND CHARLES FREDERIC MESSINGER, OF CHICAGO, ILLINOIS.

PUNCHING-MAGHINE.

Specification of Letters Patent.

Patented Aug. 8, 1905.

A li ti fil d November 25, 1901. Serial No. 83,591.

To all whom, it may concern:

Be it known that we, WALTER C. YEATMAN and CHARLEs FREDERIG MESSINGER, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvement in Punching-Machines, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings,forming a part of this specification.

Our invention relates to punching-machines, and in particular to machines for punching hexagonal and similar articles, such as nuts.

The principal objects of the invention are to provide a simple, practical, durable, and eiiicient punching machine and to arrange particularly for the punching of articles in accordance with our improved punching process. This process we have set forth and claimed in an application executed by us of even date herewith, Serial No. 83,590.

In the accompanying drawings, Figure 1 is a side elevation of a portion of a punchingmachine embodying our invention. Fig. 2 is a front view of the same. Figs. 3 and 4 are face views of the cooperating punching members. Figs. 5 and 6 are vertical sections taken Fig. 7 is a vertical section taken on line 7 7 in Fig. 1.

The machine which we have shown in the accompanying drawings to illustrate our invention is particularly adapted for the punch ing of hexagonal nuts in accordance with our improved method of preparing the same. In this new method we employ a strip or blank of sheet metal having a thickness equal to the thickness of the article to be prepared and a width equal to the shortest width thereof or, as in the case of hexagonal, octagonal, and similar articles, the distance between opposite parallel sides. From this strip or blank the articles are punched in such a manner that one side of the article or two opposite parallel sides thereof are formed by side edge portions of the strip or blank. In the case of hexagonal and octagonal nuts two opposite parallel sides are formed by two opposite portions of the side edges of the blank.

The machine which we have shown herein for carrying out this improved process is shown provided with a base or bed A and an elevated cooperating head B, between which two structures there is a relative reciprocal movement secured in any desirable wayas, for example, by reciprocating the head B toward and away from the base A. As such reciprocating mechanisms are common in punching processes and as the same forms no part of our present invention, none has been shown herein.

The base A is provided with a die-block C, which is suitably held upon the base, as by a set-screw a. This die-block is provided with a hexagonal aperture 1, into which the hexagonal nuts are to be punched. This aperture flares downwardly, as shown in Fig. 2, whereby the punchings can readily drop. This aperture 1 is arranged so that two sides extend in a direction from front to rear. The block C is also provided with a pair of holes or apertures 2 2, desirably arranged one on It is each side of the hexagonal aperture 1. also provided with a gage-pin 3 immediately in advance of the hexagonal aperture 1, which gage-pin is desirably made with a pointed front end, which is located substantially at the rearward pointed end of the hexagonal aperture 1, as well shown in Fig. 4:.

A stripper-plate 4 is mounted upon the dieblock C and secured thereto, as by screws 5 5. This plate 4 does not cover the entire top surface of the die-block C, but terminates in the front of the hexagonal aperture 1. It has its lower surface provided with a groove 6, so that when it is secured upon the die-block a closed channel or guideway for the metal strip or blank is formed. This channel or guideway is arranged in alinement with the gage-pin 3 and hexagonal aperture 1, with the sides of the channel directly in alinement with opposite parallel sides of the aperture 1. The stripperplate 4 is also provided with an aperture 6, formed by a collar 7, set therein, and this aperture opens into the channel 6 and continues through the die-block C.

The reciprocating head B is provided with a punch-block D, which is secured firmly to the head, as by providing the head with a cylindrical end 8, adapted to fit in an aperture in the head B, and by a set-screw b, fitted intothe head B.

The punch-block D is constructed with a depending rear portion cl of substantially the width of the stripper-plate 4:.

block D is provided with a hexagonal punch 9, adapted to enter the hexagonal aperture 1 in the die-block C. The punch 9 is provided This punchwith a small pointed projection 10, adapted to enter the opening or hole in the hexagonal nut. The punch-block D is also provided with a pair of stout pins or pilots 11 11, adapted to enter the apertures 2 2 in the dieblock (1. The hexagonal punch 9 and pilots 11 11 are secured in position in the die-block in any wayas, for example, by set-screws 12 12. The punch-block D is also provided with a small punch 13, suitable for punching the holes in the nuts and adapted to enter the aperture 6 in the stripper-plate 4. The machine thus constructed operates as follows:

When the blank X is fed through the channel 6 and the head B is suitably reciprocated, each reciprocation of the head causes the punch 9 to enter the hexagonal aperture 1, and thus punch a hexagonal nut from the end of the strip or blank. By each reciprocation also the punch 13 passes into the aperture 6' and punches a hole which forms the aperture for the nut next punched. Before the punch 9 strikes the blank, however, the pilots 11 11 enter the aperture 2 2, in which they slide and work slightly before, during, and shortly after the punching operation. After each punching operation the strip or blank X is fed properly forward, so that its forward end strikes the gage-pin or stop 3 whose pointed end fits into the corner of the angle cut in the front end of the blank. Thus at each reciprocation of the head B there is cut from the blank X a nut having two of its sides formed by portions of the side edges of the strip, and at the same time a hole is punched for the next nut. The punched and apertured nuts drop through the hexagonal aperture 1 and the remaining scraps, consisting of V-shaped structures, pass on opposite sides of the gage-pin or stop 3 and off from the die-block C.

It will be noted that this machine has,among others, the following points of advantage:

By the employment of the two pilots 11 11 the punch-block D is brought into firm and rigid engagement with the die-block C before the punch 9 strikes the material. Thus all lateral strain of the press and all lost motion of the reciprocating head is taken up, and, furthermore, the parts are held relatively against transverse movement, so that the punching operation is perfectly accurate and reliable and there is no interference of parts due to lack of alinement. By dispensing with the stripper-plate the punch can be made very short. The advantage gained in this respect is well illustrated by comparison of the punch 13 and its stripper-plate 4 with the punch 9. The punch 13 is relatively long, made so by having to pass through the stripper-plate 4 before encountering the material and performing the punching operation; but the punch 9 by the absence of thestripper-plate is made relatively short.

As another advantage the gage-pin 3 engages the front end of the strip or blank, and thus insures the punching of the next nut in the proper manner. By making the front end of this gage-pin pointed engagement is secured between this point and the corner of the angle cut inthe blank, thus insuring stoppage of the blank at precisely the proper point and also engaging it in such a manner as to prevent any lateral movement or displacement of the end undergoing the punching operation. of the pin 3 relatively to the pilots 11 11 the scraps are permitted to move between the pin and the pilot,thus having free exit from the punch and insuring-the proper falling of the waste stock without interference with the operation of the press.

It will be understood that we do notiiitfid to limit ourselves to the exact construction and arrangement herein set forth, as various devices and portions of the machine can be changed or modified at will without departing from the spirit of our invention. For example, the pilots 11 11 can be varied in number and can be arranged differently in relation to the dies and other parts, if desired. Other modifications and changes will suggest themselves to those well versed in this art.

What we claim as our invention is 1. The combination of a reciprocating head having two punches, one for punching the nutblank from the strip,and the other for punching a hole in the end portion of the strip which becomes the nut, a die-block having dies for said punches, and a stripper-plate mounted on the dieblock and provided with a channel forming a closed guideway leading to the nutpunch, said plate being provided with an aperture for the hole-punch, substantially as described.

2. The combination of a reciprocating head having two punches, one for the nut-blank,and the other for the hole therein, the former punch being provided with a centering-pin, a die-block having dies for said punches, and a stripper-plate mounted on said head and provided with a channel forming a closed guideway leading to the nut-punch, said plate being provided with an aperture for the hole- 7 punch, substantially as described.

3. The combination of a reciprocating head having two punches, one for punching the nutblank, and the other for punching a hole in the end portion of the strip the nut-blank punch being hexagonal or of similar form, a die-block having dies for said punches, and a stripper-plate having a channel whose width is substantially the distance between parallel sides of the hexagonal or like die, said channel being arranged with its sides in alinement with parallel sides of the die, and said plate being provided with an aperture for the holepunch, substantially as described.

4:. The combination of a reciprocating head having a projecting portion, a punch for the Furthermore, by the arrangement nut-blanks fitted into and extending outwardly from said projecting portion, a. punch for forming apertures in an end portion of the strip, said hole-punch being fitted into and extended from the receding portion of the head, a die-block having dies for said punches, and a stripper-plate mounted on said dieblock and arranged between the same and the receding portion of the head, and being provided with an aperture for said hole-punch, substantially as described.

5. The combination of a pair of cooperating members, one of which is arranged to reciprocate toward and away from the other, of a pair of punches carried by one of said memb'ers, one punch being for striking nut-blanks from a strip of metal, and the other punch being for punching holes in an end portion of said strip which is struck off by the other punch, dies for said punches carried by the other member, and a stripper-plate carried by the die member and provided with a channel forming a guideway to the nut-blank punch and also provided with an aperture for the hole-punch, substantially as described.

6. The combination of a pair of cooperating members, one of which is arranged to reciprocate toward and away from the other, a pair of punches carried by one of said members, one of said punches being for striking nut-blanks from a strip of metal, and the other for punching holes in an end portion of said strip. a guideway for the metal strip leading to the nut-blank punch, and means for holding the strip against movement on the upstroke of the hole-punch, substantially as described.

7. A machine for making apertured nutblanks of hexagonal or similar form comprising a pair of cooperating members, one of which is arranged to reciprocate toward and away from the other, a pair of punches carried by one of said members, one of said from, substantially as described.

8. The combination of a die-block C having a hexagonal aperture 1 and also having apertures 2, 2, on opposite sides of the aperture 1, a pointed stop 3 secured to the die-block 'C at the forward end of the die-aperture 1, a

stripper-plate 41: secured to the front of the die-block and terminated at the rear edge of the aperture 1, said stripper-plate being provided with a groove of substantially the same width as the width of the die and being arranged with the sides of said groove in alinement with opposite sides of the hexagonal aperture 1, said stripper-plate being also provided with an aperture 6 formed by a collar 7, a reciprocating head D arranged above the die-block G and constructed with a depending portion cZ arranged to descend behind the stripper-plate, and provided with a punch 9 having a pin 10, pilot- pins 11, 11, secured to the reciprocating head D and adapted to work in the apertures 2, 2, and a punch 13 also secured to the head D and arranged to work in the aperture 6, substantially as described. In witness whereof we hereunto subscribe our names this 18th day of November, A. D.

WALTER O. YEATMAN. C. FREDERIC MESSINGER.

Witnesses:

A. MILLER BELFIELD, HARVEY L. HANSON.

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