US1124929A - Clicking-die. - Google Patents

Description

T. LUND.

GLIGKING DIE. APPLICATIQN FILED APRA?, 1911.

1 ,1 24,929, Patented Jan. 12, 1915.

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THOMAS LUND, OF BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION 0F NEW JERSEY.

GLICKINGr-DIE.

To all 'whom it may concern Be it known that I, THOMAS LUND, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain Improvements in Clicking-Dies7 of which the following description, in connection with the accompanying drawings, is a specication, like reference characters on the drawings indicating like parts in the several gures.

This invention relates to dies for cutting out blanks from sheet material and more particularly to dies of the type used with clicking presses to die outblanks from upper' leather for use in the manufacture of boots and shoes.

In nishing the exposed edges-of blanks entering into the construction of a shoe it is the practice to cement yand fold the edge back upon itself in order to improve its appearance, and where the contour of the edge' to be folded. is curved it is necessary to slit or snip the material so that it may be turned back smoothly. Heretofore'the slitting or snipping has been done by hand or by special machines as a separate operation after the blank has been cut out.

It is an object of the present invention to provide a die by the use of which the curved edges of the blank may besnipped simultaneously with the dieing out operation.

As herein shown one form of die embodying the invention comprises an open frame having a continuous cutting edge shaped to form the outline of the blank and means projecting inwardly from the cutting edge for forming slits in the edge of the blank. By the employment of a die of this character the necessity of snipping the blank as a separate operation is obviated, while accurate and uniform work is insured. Moreover, the dieing out operation is not affected in any detrimental manner, and, in fact, the economy of cutting the leather is improved as the snipping means on the die indicates to the cutter which portions of the -blank are to be folded under, thus enabling him to include slight imperfections or thin spots in those portions of the blank which are concealed in the finished shoe.

A die constructed in accordance with the present invention is particularly well adapted for use in practislng the novel method Specification of Letters Patent.

j a novel manner.

disclosed in my co-pending application Serial No. 554,319, filed April 9, 1910, of which the present application is a division. The subject-matter of that application relates to a method of forming upper blanks which consists in dieing out a blank, snipping the curved edges thereof, and skiving the snipped edge preparatory to folding the edge. however, is not limited in its use to any particular method but is of general application wherever a ysnipped edge is required or desirable,

Patented J an. 12, 1915.

i910, serial No. 554,319. :Divided and this application mea April 17,

serial No. 621,528.

rIhe die of the present invention,

An important feature of the improved die4 is itscontinuous open frame and unobstructed center, as a result of which the operator is able to see the stock inside the cutting edge and to place the die accurately and quickly 'in position to utilize the stock to the best advantage. i

Still another feature of the invention consists in snipping blades formed in the die in In order to avoid the in-4 convenience of constructing and securing in place a plurality of blades it is proposed to employ material of substantially uniform cross section for the' curved sides ofthe die and to form the blades integrally therein by removing portions of the material adj acent to the cutting edge leaving projecting walls which are subsequently sharpenedto form the transverse snipping blades.

In the v accompanying drawings which illustrate a die embodying the invention and the preferred manner of using the diez- Figure 1 is a view in perspective of a die'in inverted position for kcutting Blutcher quarters, thevdie having snipping blades 0n its curved edge; Fig. 2 is a view in perspective of the die placed upon a skin of leather in a clicking press; Fig. 3 is a view showing a quarter with its curved edge snipped, skived f and part of it folded over. i

'Ihe die shown in Fig. 1 comprises an open frame sharpened on one edge to form a continuous cutting edge 8 and having a flattened oppositely disposed edge 5 to receive the pressure of the clicking or dieing out ress. The center of the die is left free and unobstructed so that the entire surface of the blank to be cut is in full view of the cutter as he locates the die upon the skin preliminary to the dieing out operation. The curved side of the dief is provided with a series of separated slitting or snipping blades 4 disposed with their cutting edges in the plane of the cutting edge 3 of the die and intersecting that edge in directions substantially normal to the curvature thereof at the points of intersection. It will be apparent therefore that the snipping blades located on a portion of the die which is conveX toward the center, as for example, the portions which cut the upper and lower part of the front edge of the vamp shown in Fig. 3, will be disposed in a divergent relation, while the snipping blades located on a portion concave toward the center of the die will be disposed convergently. This arrangement of the snipping blades insures that the tongues formed will be of such shape that, when they are folded back upon the body of the blank, they will occupy the least possible space transversely. On straight and convex work, therefore, there will be no overlapping of the tongues, while on concave work the overlapping will be reduced to a minimum. These conditions contribute to the formation of a smooth edge of uniform appearance in the finished blank.

As herein shown the curved side of the die is constructed of material of substantially rectangular cross section and the snipping blades are formed by cutting or grinding out portions adjacent to one edge thereof, forming a bevel on the inside of the' die. rIhe walls left between each ground out portion are then sharpened to form a series of transverse blades 4. The inner sides or ends of the blades 4 are, therefore, flush with the inner surface of the die.

rlhe construction above described is advantageous because of its simplicity and because it leaves the center of the die unobstructed, but it will be apparent that there are other methods of forming and securing the snipping blades in place.

In practice a skin of leather 11 or the material to be cut into blanks is placed upon the cutting block 8 of a clicking press and the die is located on the skin with its sharp'- ened edge resting thereon. The arm 6 of the press is thereupon swung vertically above the die by the handle 12 and upon the depression of the same handle the arm 6 is brought forcibly down upon the die with sufficient pressure to cause it to cut through to the block. The arm is then moved away and the die with the cut out blank removed. A clicking press of preferred construction is disclosed in United States Letters Patent No. 921,503 granted May 11, 1909 on an application of Arthur Bates, although others would serve equally well.

The peculiar form of the curved edge of the die and the inwardly projecting snipping blades 4 cause slits to be cut at intervals along the curved edge of the blank at the same time that the blank is cut out, thus accomplishing in a single operation, at a single stroke, what it has previously required two separate operations to perform.

A blank 9 cut out and snipped by the die of F ig. 1 is shown in Fig. 3. In the edges of the blank cut by the curved side of the die will be seen the short slits 13 which have been cut by the blades 4. To facilitate folding the edge it is advantageous to skive off part of the material, the skived edge being shown at 10 in Fig. 3. Cement is applied to the scarf formed by the skiving machine and the edge is then folded back upony the blank forming a smooth well linished edge suitable for use in high class work.

lt will be noted that the snipping blades 4 are clearly visible and conspicuous from the upper side of the die as the cutter inspects the leather through the open center of the die. rIhey therefore'v serve tov indicate plainly that the curved edge of the die may be located so as to cut slightly into imperfections occurring in the leather and' thereby make possible considerable saving of leather.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A die for cutting out a blank and simultaneously snipping its edge, comprising a frame having a continuous cutting edge, a portion of which is in the forml of a smooth unbroken curve concave toward the center of the die, and a series of short, straightl 4snipping blades extending inwardly from said concave portion of the cutting edge in convergent relation but yseparated from each other at their inner ends.

2. A die for cutting out a blank andsimultaneously snipping its edge, comprising a frame having a continuous cutting edge, a portion of which is in' the form of a smooth unbroken curve conveX toward the center of the die, and a series `of short snipping blades extending inwardly from said convex portion of the cutting edge in' divergent relation and substantially normal to the curve of the cutting edge.

3. A die'y for cutting out a blank and simultaneously snipping its curved edges, comprising a frame of which a portion is in the form of asmooth unbroken compound curve with a sharpened cutting edge, and a series of snipping blades projecting inwardly from the curved cutting edge of the die, the blades located upon a portion which is concaved toward the center of the die being convergent and those located upon a portion conveXed toward the center of the die being divergent.

4. A device of they class described comprising a continuous'open frame having a cuttingl edge and an oppositely disposed parallel pressure receiving edge, together with separate snipping blades formed inlSO tegral with said frame, intersecting the cutting edge thereof and projecting inwardly from the curved portions of the frame in directions normal to the curvature of the frame at the points of intersection of the shipping blades and the cutting edge of the frame.

5. A device of the class described comprising an open frame having a continuous cutting edge and an oppositely disposed parallel pressure receiving edge, together with snipping blades having straight cutting edges each arranged to intersect the cutting edge of the frame at substantially right angles and being supported by the sides of said frame between the cutting edge and the lpressure receiving edge thereof.

6. A die of the class described comprising a frame sharpened for cutting at its lower edge, a curved portion of the frame being constructed of lmaterial of substantially rectangular cross section beveled on one side to form the cutting edge and having formed therein snipping blades the inner ends of which are substantially7 Hush with the inner surface of the die material. y

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

THOMAS LUND.

Witnesses:

ELMER B. GRUSH, CHARLES E. GRUsH.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. 0.

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