US1117061A - Cutting-die. - Google Patents

Description

P. F. W. G. KRIPPENDORP.

CUTTING DIE.

APPLICATION rum) 1123.4, 1902.

1,1 17,061 Patented Nov. 10, 1914.

| fl l qr j I I :5 JQVL j M WW THE NORRIS PETERS CO-. PHOTO-LITHQ, WASHINGIUN, D O,

omrnn sraras PATENT OFFICE. q PAUL F. W. C. KBIPPENDORF, OF IiFNN, MASSACHUSETTS, ASSIGNOR. T0 ONITED MACHINERY COMPANY, OF PATEESON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

oUTTrNc-mn' Application filed April 4, 1908-. Serial No. 425,108. j

To all whom it may concern:

Be it known that 1, PAUL F. W. G. Kerr- PENDORF, a citizen of the United States, and a resident of Lynn, in the county of Essex and State of Massachusetts, have invented an Improvement in Cutting-Dies, ofwhich the followingdescription, in connection wlth the accompanying drawing, is a specification, like letters on the drawing representing like parts.

This invention relates to a die for cutting out irregular shapes, and is particularly concerned with a die for cutting out irregular shapes of leather to form the parts of shoes.

In the manufacture of shoes it has been the general practice to cut the shoe-parts from leather by hand, the operative placing a pattern of the desired shape on top of the leather and running a sharp knife around the edge of the pattern. It is now the practice to a large extent to use cutting dies by means of which the shoe parts are cut or died out, but it will be obvious that this involves large expense because it requires a separate die for every size, shape and style of shoe part. With the passing away of a particular style of shoe the dies for that style become worthless. l/Vhen any die becomes nicked or injured the entire cutting edge has to be ground down. As a result, therefore, the expense of producing and maintaining sufficient dies for the cutting of the shoe parts, tends to deter manufacturers from entirely abandoning the older method of hand cutting.

This invention-presents a die, thebase'of body portion of which is inexpensive and can readily be made up into any desired shape, combined with a removable, sharp steel, cutting edge, which in its preferred form may be removed in sections. The invention also presents a reversible die, by means of which right and left-hand shapes may be cut from the same die. The invention, therefore, enables the cutting of shoe parts and similar irregular shapes to be performed by means of a die at a comparatively small labor cost, and at the same time presents a die which may be manufactured cheaply and easily, and in whichthe expensive sharp steel cutting edge may be removed and transferred to another die when a change of shape is desired, and in the cutting out which wheninjury is caused to any portion of the cutting edge that portion maybe removed and repaired or replaced, without affecting the remainder of the cutting edge of the die. The nature of the invention will more fully appear from the accompanying specification and drawings and will be particularly pointed out in the claims.-

The drawings show a single die of the reversible type, of the shape requisite for of the tip part of a shoe; Figure l is a i plan view of a die embodying the invention of ashape to cutshoe tips. lug. 2 1s a cross-sect1on of the con struction shown in Fig. l on the line 2-- 2. F ig; 3 isaside elevation of a portion of the. construction shown in Fig. 1 looking from the outside. Figs. tively left and right-hand quarter of a shoe. Figs. 6 and 7 are plan views. of special forms of cutting blades. 7

A die embodying this invention comprises l and 5am respecin the first place. a base or'body portion which may be made of any suitable crosssectional shape, but in its preferred form presents a rib portion A anda flange portion B,= preferably tapering to an edge.

When the die is to be made reversible two of. these flange portions B are provided, projecting from opposite sides of therib A, asshown in the drawings. This baseof the die may be readily made from steel by being rolled cold in the desired cross-section, and of any length in the manner well known in forming various shapes of cold rolled stee it ispreferred that the inner face B of the flange shall be vertical or at right angles to the rib A.

The material for the die base :is cut off the required length and then bent into the desired shape, or in other words, is bent so that the edge of the flange, shalltake the shape of the article to be cut. The ends of In the tapering form offlangeillustrated if the base are then welded or suitably secured together. It will be noted that in this manner die bases of any desired shape can be readily and easily made.

The cutting edge of the die is formed as a thin, flexible, steel sharpedged cutting element, and in the preferred form this cutting element is made in sections, and is so illustrated in the drawings. These steel sections C are preferably sharpened at both edges, and are provided with holes C spaced at fixed distances from each other and from the edge of the sections. Each section should have at least two holes in it, and as a rule it will be desirable to provide sections of differentlengths, having two, three and four holes respectively, but the holes in all having the same spaced relation. These steel sections being flexible will conform readily to the shape of the die, but it will be found desirable to have a few special shapes for corners, such as shown in Figs. 6 and 7, and usually two or three shapes of each angular and curved kind illustrated will be sufficient, because corners of other angle and curvature can be fitted by bending the one of those illustrated which conforms nearest to the corner to be fitted.

.A. series of clamping plates D, of less width that the steel sections C, are provided and have holes therein of the same spaced relation as the holes in the sections C. These clamping plates may be made of multiple unit lengths as in the case of the steel sections.

The cutting edge of the die is formed by bolting on the steel sections to the edge of the flange B with the cutting edge of the section projecting therebelow. In order to insure a continuous cutting edge at all points it is preferred to place the steel sections G on both sides of the flange B with their cutting edges coinciding, as shown in cross-section in Fig. 2-. In the inner vertical surface B the sections abut, and at sharp angular or around corners the special blades such as shown in Figs. 6 and 7 are used. If the sections in lengths furnished, for example with two, three and four holes, when abutted are not of the same length as the periphery, then one or more of thesetions may be out off to fit.

The sections on the outer or inclined periphery of the die base are arranged with their joints staggered with respect to the joints on the inner periphery. The joints on the outer periphery will open a. little at the bottom, but owing to these joints coming opposite the solid section on the inner periphery there will at all places be a continuous cutting edge.

Small bolts E placed through the holes in the clamping plates serve to clamp the sections firmly to the flanges of the die base. These clamping plates are put in place so that the joints between the same shall be staggered with relation to the joints between the steel sections against which they rest.

It will thus be seen that a continuous cutting edge is presented at the edge of the flange of the die base. Any portion of this cutting edge may be readily removed by loosening two of the clamping plates on each side of the flange and a new section put in place. Hence, if any portion of the cutting edge is nicked or worn it can be readily renewed at small expense and without the necessity of grinding down the entire cutting edge.

\Vhen the style of shoe changes and it is necessary to use different shape dies, the die base may be cheaply and readily constructed as hereinbefore described, and the cutting edge comprising the steel sections, clamping plates and bolts removed from the discarded die base and placed upon the new die base. While it may be necessary to throw away or discard some few of the sections the great majority of them will be suitable for continued use on the new die base. Furthermore, when the reversible steel sections shown are used the cutting edge may be renewed by reversing some or all of the sections as found expedient. The steel sections may be kept on hand in quantities in the few varying lengths and angles required, and there is, therefore, on hand at all times the means for fitting out a die base of any required shape.

Dies of this character are usually employed in what is commonly known as a clicking press, which comprises a bed upon which the leather to be cut is laid, and a platen which comes down upon the die and presses it into the leather. In Fig. 2 I have illustrated at Gr a portion of the surface of the bed of such a machine, and at I a portion of the surface of the platen of such a machine. It is desirable in using the die in one of these clicking presses to keep the cutting edge off from the leather until the cut is to be made, so that the operative in moving the die around to position it on the leather to cut the leather most economically will not injure the leather with the cutting edge. To secure this result the die base of this invention is preferably provided with a plurality of yielding guards, herein shown as rods K, provided with feet K mounted to slide freely in holes in the die base rib A, and prevented from falling out of the holes by flanges K Coiled springs K encircle the rods K between the feet K and the rib A, and the rods K are of such a length that these springs normally hold the feet K of the guards projecting beyond the cutting edge. When the die is set upon the leather resting upon the bed of the clicking press, it may be moved around over the leather supported by these guards, without the cutting edge making any contact with the leather. When the leather is properly positioned and the die is then forced down upon the leather to cut out the required shape the guards will yield, allowing the cutting edge of the die to cut through the leather, and then when the die is elevated the guards will spring out and act to discharge the leather from the die. In the reversible form of die illustrated these guards are provided for each cutting edge, and each guard carries a locking device, shown as a bifurcated bar 0, straddling the rod K and pivoted thereto at near the foot K so that when the bar 0 and the rod K are parallel the end of the bar 0 will be level with or project slightly beyond the foot K The free end of the bar 0 is weighted, as at 0 at one side of the pivotal point. These bars 0 are of such a length that when the free end rests upon the rib A the foot K of the guard will be projected beyond the cutting edge of the die. which ever position the die may be placed the upper bars 0 will swing down with their free ends upon the rib A, and hold the guards to which they are pivoted projecting beyond the cutting edge, so that when the platen of the clicking presscomes down its force will be transmitted through the upper ends of the rods 0 directly to the rod A,

' and at the same time the lower guards impelled by the weights 0 will swing down away from the rod K, leaving the lower guard free to yield as the die comes down.

Having described my invention, What I claim asnew and desire to secure by Letters Patent, is:

1. A cutting die comprising a base conforming in outline to the shape to be cut, a

- thin, flexible, sectional, steel, sharp-edged cutting element presenting an endless contour, and means for removably attaching said cutting element tosaid base in conformation with the outline thereof.

2. A cutting die comprising a base conforming in outline to the shape to be cut, a thin, flexible, sectional, steel, sharp-edged cutting element presenting an endless contour, and means for independently and removably attaching the sections of said cutting element to said base in conformation to the outline thereof. I

3. A duplex cutting die comprising a base, conforming in outline at each of its edges to the desired shape and thus adapted to outline at one edge a right and at the opposite edge a correspondingly left shape, two thin, flexible, sectional steel, sharp-edged cutting elements, means for removably attaching one of said cutting elements to each edge of said base in conformation with the outline thereof.

4:. A duplex cutting die comprising a base, conforming in outline at each of its edges to the desired shape and thus adapted to outline at one edge a right and at the opposite edge a correspondingly left shape, two thin, flexible, sectional steel, sharp-edged cutting elements, means for removably attaching one of said cutting elements to each edge of said base in conformation with the It will thus be seen that in outlinethereof, guards mounted to yield vertically with respect to said base and pro jecting normally beyond each of said cutting edges.

5. A duplex cutting die comprising a base, conforming in outline at each of its edges to the desired shape and thus adapted to outline at one edge a right and at the opposite edge a correspondingly left shape, two thin, flexible, sectional steel, sharp-edged cutting elements, means for removably attaching one of said cutting elements to each edge of said base in conformation with the outline thereof, guards mounted to yield vertically with respect to said base and projecting normally beyond each of said cutting edges, and means for lockingeither of said guards against vertical movement with respect to said base.

6. A duplex cutting die comprising a base, conforming in outline at each of its edges to the desired shape and thus adapted to *outline at one edge a right hand and at the opposite edge a correspondinglyleft shape, two thin, flexible, sectional steel, sharp edged cutting elements, means for removably attaching one of said cutting elements to each edge of said base in conformation with the outline thereof, guards mounted to yield vertically with respect to said base and projecting normally beyond each of said cutting edges, and locking devices for locking either of said guards against vertical movement with respect to said base, the up per guard when either cutting edge is in position to out being automatically held by its locking device in projected position, and the lower guard being automatically unlocked to yield upon the depression of the base and allow the lower cutting edge to perform its cutting function.

7. A cutting die comprising a base conforming at its lower'edge in outline to the shape to be cut, and presenting adjacent said edge an inner vertical and an outer inclined periphery, a series of thin, flexible, steel blades each presenting a cutting edge and located on both the said peripheries, and means for removably attaching said blades to said base in staggered relation with their cutting edges coinciding and projecting below said base and conforming to the outline thereof. 1

8. A cutting die comprising a base conforming at its lower edge in outline to the shape to be cut, and presenting adjacent said edge an inner vertical and an outer inclined periphery, a series of thin, flexible, steel blades each presenting a cutting edge and located on both the said peripheries, means for removably attaching said blades to said base in staggered relation with their cutting edges coinciding and projecting below said base and conforming to the outline thereof, and a series of angular, flexible steel blades each presenting a cutting edge and adapted to conform to the inner angles of said base. i

9. A cutting die comprising a base conforming in outline at each of its edges to the desired shape and thus adapted to outline a right and at the opposite edge correspondingly left shape, said base presenting adjacent each edge an inner vertical and an outer inclined periphery, a series of thin, flexible, steel blades arranged end to end along both peripheries of said base in staggered relation with their cutting edges coinciding and projecting below, a series of flexible clamping plates extending over the in eting edges of said plates, and means for removably clamping said plates and blades to said base to conform to the outline thereof.

10. A duplex cutting die comprising a base, conforming in outline at each of its edges to the desired shape and thus adapted to outline at one edge a right and at the opposite edge a correspondingly left shape, two thin, flexible, sharp-edged cutting ele ments, means for removably attaching one of said cutting elements to each edge of said base in conformation with the outline thereof.

11. A duplex cutting die comprising a base, conforming in outline at each of its edges to the desired shape and thus adapted to outline at one edge a right and at the opposite edge a correspondingly left shape, two thin, flexible, sharp-edged cutting ele 1nents,'means for removably attaching one of said cutting elements to each edge of said base in conformation with the outline thereof, guards mounted to yield vertically with respect to said base and projecting normally beyond each of said cutting edges.

12. A duplex cutting die comprising a base, conforming in outline at each of its edgesto the desired shape and thus adapted to outline at one edge a right and at the opposite edge a correspondingly left shape, two thin, flexible, sharpedged cutting elements, means for removably attaching one of said cutting elements to each edge of said base in conformation with the outline thereof, uards mounted to yield vertically with respect to said base and projecting normally beyond each of said cutting edges, and means for locking either of said guards against vertical movement with respect to said base.

1-3. A duplex cutting die comprising a base, conforming in outline at each of its edges to the desired shape and thus adapted to outline at one edge a right and at the opposite edge a correspondingly left shape, two thin, flexible, sharp-edged cutting elements, means for removably attaching one of said cutting elements to each edge of said base in conformation with the outline thereof, guards mounted to yield vertically with respect to said base and projecting normally beyond each of said cutting edges,-and locking devices for locking either of said guards against vertical movement with respect to said base, the upper guard when either cutting edge is in position to out being held by its locking device in projected position, and the lower guard being unlocked to yield upon the depression of the base and allow the lower cutting edge to perform its cutting function.

l l. A die for cutting sheet material, com prising a frame with tapering blade carrying port-ions, and thin cutting blades secured to both sides of said portions and converging to a common cutting edge.

15. A die for cutting sheet material having a cutting edge formed by blades converging to a common edge, and a frame for holding said blades in convergent relation.

16. A die having its opposite edges disposed in parallel planes and comprising a frame having a continuous outer face and cutting blades secured thereto, said frame having a relatively thick longitudinally extending rib and tapering portions extending from said rib into proximity to, and supporting, the cutting edges of the blades.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

PAUL F. W. C. KRIPPENDORF.

lVitnesses:

MABEL PARTELOW, THOMAS J. DRUMMOND.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents,

Washington, I). 0.

It is hereby certified that in Letters Patent No. 1,117,061, granted November 10, 1911, upon the application of Paul F. W. (J. Krippendorf, of Lynn, Massachusetts,

for an improvement in Cutting-Dies, errors appear in the printed specification requiring correction as follows: Page 2, line 38, for the Word around read wound; page 3, line 88, strike out the word hand; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 2nd day of February, A. D., 1915.

[SEAL] R. F. WHITEHEAD,

Acting Commissioner of Patents.

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