US2324857A - Cutting die - Google Patents

Description

Jly 20, 1943.` s LEs`K|Ew|z v 2,324,857

CUTTING DIE f F11-ac; Feb. 4, 1941 INVENTOR. -S+Qn /ey esile vl c L Patented July 20, 1943 CUTTING DIE Stanley 'Leskiewicm Lynn, Mass., assignor to North Shore Cutting" Dies Company, Lynn, Mass.

Application February 4, 1941, Serial No. 377,310

2 Claims.

The present invention relates to cutting dies and more particularly to double edged cutting dies in which both top and bottom edges are used in the dieing out process. More particularly the present invention relates to clicker dies which are used in the manufacture of shoes to stamp out the leather which goes'to make up the upper of the shoe. Dies of this type are constantly changed with the change of style, design and cut of the uppers and therefore the cost of the dies is an item of considerable importance in the manufacture of shoes. Originally single edged dies alone were used. These dies were laid over the material and then were hit on the top edges by an impact element to force the cutting edge of the die at the other edge through the material. Double edged dies have more recently been used with impact elements that were sufficiently soft so that the top edge of the die would not be pulled.

In the use of the double edged die, the die is rst struck on one edge dieing out the piece of material beneath it and then it is turned over to die out a second piece oi material. It will be evident that by turning over the die the same die may be used for both rights and lefts in shoes and this is more particularly the use of the double edged Clicker die since it saves the cost of both right and left dies.

When the stock is died out by the clicker die it is useful to use punch holes as a guide for further handling the materials. With the use of double edged clicker dies, punch hole dies for guides and other purposes have not in general been used but the present invention however provides a means by which punch hole dies may be used with double edged clicker dies Without the holes filling up and spoiling the die or bearing blocks.

The chief difliculty With an ordinary punch hole in a double edged clicker die is that the material fills the punch hole from both ends and gradually therefore lls up the punch hole so that eventually the punch merely chews the material without actually cutting out the desired hole.

The present invention overcomes this difficulty by providing a means which ejects the punched out material at each end partly after the punching and provides therefore a double edged clicker die Which can be used indenitely without lling up the punch hole.

The present invention will be more fully described in connection with the specification below and the drawing in which:

Figure 1 shows a plan view of the invention, and,

Figure 2 shows a section on the line 2-2 of Figure l.

In Figure 1, the double edged clicker die is indicated by the numeral l which has an upper cutting edge 2 and a lower cutting edge 3, see Figure 2. The die may be most any shape and the shape illustrated in Figure 1 shows one possible form which the die may take.

As indicated in Figure 1 the die is provided with a center supporting bracket 4 with extending branches Il which may be welded to the sides of the die ribbon. This element 4 provides a support for the cross strip 5 which holds the punch hole die 6 supported in the same relative position as the clicker die ribbon itself. 'I'he punch hole die 6 has an upper and lower cutting edge which are level with the cutting edges 2 and 3 mentioned before. This punch hole die 6 which as indicated is circular in shape, may be Welded, pressed, soldered or held in any suitable manner in the supporting bridge 5. The supporting bridge 5 may be supported as mentioned before at one side to the bracket 4 and at the other side to a part of the die ribbon as indicated at I2. Within the punch hole die 6 is a helical spring 3 which has one free end adjacent the top cutting edge of the punch hole die and the other free edge adjacent the other cutting edge of the punch hole die. The helical spring at its center is supported by a pin 1 which passes through one coil of the spring and is xed in the wall of the die tube so that if either end of the spring is pressed it will spring out to its normal position as indicated in Figure 2, the pin 1 serving as a stop and support member for the reaction of the spring.

As has been previously explained the material to be died out is placed on the die block and the clicker die is placed over it, the punch press then comes down and drives the die through the material cutting it out of the material in the shape of the die. The die is then removed from the material and simultaneously the bottom end I0 of the spring, if that is the piece in contact with it would be in the position indicated in Figure 1, drives the punched material from the tube 6. The die is then turned over for the left or right as the case may be and the material is again died out. Similarly the end 9 of the spring ejects material in the tube so that when the process is again repeated it will be clear and will never ll up- While the clicker die indicated in Figure 1 does not show much of a distinction between left and the right, it will be noted that the side I3 is more rounded and slightly different in appearance than the side I4.

Dies of this nature are Very frequently cut quite similar with only slight diierences for left and right which by the present means may be satised with a single clicker die.

Having now described my invention, I claim:

1. In combination with a double edged clicker die, a double edged punch hole die extending the i-ull length from edge to edge of the clicker die, a frame extending between the walls of the die stock of said clicker die substantially to a median position between the opposite edges of said clicker die, and supporting symmetrically therewith said punch hole die, a helical spring normally occupying the length of said punch hole die and a pin extending diametrically through the wall of said punch hole die midway between the ends of the die and passing between a spiral of said helical spring.

2. In combination with a double edged clicker die, a double edged punch hole die extending the full length from edge to edge of the clicker die, a frame extending between the walls of said clicker die and supporting said punch hole die symmetrically between the planes formed by the opposite edges of said clicker die, said punch hole die extending substantially to said planes, a helical spring normally extending the length of said punch hole die and means pinning said helical spring in its center portion the walls of said punch hole die.

STANLEY LESKIEWICZ.

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