US2220296A - Combination perforating die and striking plate - Google Patents

Description

Nova 5, 4 L. w. SIMISTER' A2226 GOMBINATION FERFORATING DIE AND STRIKING PLATE Filed Feb. 16, 194@ INVENTOR. Zou/s SIM/575R.

ATTORNEY.

Patented Nov. 5, 1940 UNITED STATES PATENT OFFICE COMBINATION PERFORATING DIE AND STRIKING PLATE and Carlton E. Knight Application February 16, 1940, Serial No. 319,187

5 Claims. (Cl. 164-93) This invention relates broadly to perforating dies as used in the shoe industry and in kindred industries, and more particularly to a combination perforating die and striking plate.

Certain styles of shoes are embellished by perforating ornamental'designs in the upper or tip portions thereof.

Generally speaking, perforating dies as now commonly used for this purpose consist of a base having therein upwardly extending tubes, blades or other plungers. Mounted thereon with springs is a stripper plate having openings therein corresponding with the tubes, blades, etc., of the base, and through which they are adapted to pass. Suspended over each perforating machine is a roll of thick, card-board like paper, which is caused to be moved downwardly, so that a portion of the paper covers the perforating area of the die. The material to be perforated is placed between the stripper plate and paper, the latter acting as striking surface.

This arrangement has many disadvantages; th paper must be changed very frequently, costing considerable money when measured in terms of months and years; the die never contacts the paper twice in the same place, the vibration of the machine causes paper to move, which in turn will move the material to be perforated, making it necessary to hold said material in place by means of clips; cumbersome and. unnecessary parts must be added to the perforating machine for holding and moving the paper; and occasionally too, a less experienced operator will attempt to hold the material in place with his finger tips and, when they are not withdrawn in time, severe injury may, and occasionally does, result.

With this in view, it is the principal object of this invention to completely eliminate the use of paper as striking surface by providing the commonly used perforating die having a base and stripper plate, with a second or striking plate, which is connected thereto, and between which and the stripper plate the material to be perforated is placed.

A further aim of the present invention lies in providing a second or striking plate of copper, brass or other suitable material, so positioned as to cover the perforating surface of the die, when in operative engagement therewith.

A still further advantage resides in the provision of means for positively preventing the material to be perforated from moving, thus eliminating the use of clips now needed to hold said material in place.

Yet another purpose is to provide a stripper plate and a striking plate with means for normally holding them apart, and providing the striking plate with means for limiting its outward movement relative to the stripper plate.

These and other meritorious objects and advantages are accomplished by the novel and practical combination of few and simple parts hereinafter described and illustrated in the accompanying drawing, in which:

Figure l is a top plan View of a perforating die, showing the striking plate secured thereto.

Figure 2 is a front elevational view of the device, the striking plate being in its open or inoperative position; and

Figure 3 is a side elevational view showing, in solid lines, the striking plate in an open or inoperative position, the dotted or broken lines showing said plate partly closed.

Referring in greater detail to the drawing, the numeral It) indicates generally a perforating die comprising a base or punch I l superimposed upon which and mounted thereon by springs is a stripper plate l2 having openings I4 therein. The openings l4 correspond with a series of tubes, blades or other perforators, which extend upwardly from the base II and which are arranged in ornamental design.

A striking plate [4, substantially rectangular in cross-section and of a size sufficiently large to cover the perforating area of the die when in closed or operative position, and made of brass, copper-or other suitable material corresponding to the tubes, blades or has indentations l5 corresponding to the tubes, blades or other plungers of the die and made by them in the course of perforating operations, is hingedly connected to the stripper plate l2 by means of a hinge 16, about the hinge pin of which is wound a spring l1, one leg of which presses against the striking plate I4 andthe other leg of which presses against stripper plate forcing said striking plate normally away from said stripper plate.

In order to limit the outward movement of said striking plate with respect to said stripper plate, there is provided, alongside of and parallel with that leg of spring I! which presses against said striking plate M, a substantially rectangular bar, one-half of which, as at I8, is secured to said striking plate, its other half 19 depending therebelow. The part l9 obviously acts as stopper for limiting the outward movement of said striking plate l4 beyond an angle of substantially 90". A guide bar 20 is provided on the upper part of stripper plate l2, and a corresponding opening 2| is provided in said striking plate M to permit said bar to clear when said striking plate I4 is in a closed or operative position. Bar 20 acts as gauge for material to be perforated.

In operation, the material to be perforated is placed between said stripper plate and said striking plate. Said striking plate will be open or angularly away from said stripper plate at that time. To prevent too great an outward movement of said striking plate, stoppers are provided to limit this movement.

After the material to be perforated has been placed upon the stripper plat-e, the die is entered into the perforating machine, causing the striking plate to close over the material, holding it firmly in place during perforation. The die is then removed from the machine, which will cause said striking plate to move outwardly under the influence of spring H to a point where stopper l9 will limit such' outward movement. After this has been done a few times, that is, after several perforating operations have been made, there will appear upon the inner face of striking plate [4 a series of indentations corresponding to the perforators of the die. These indentations will act as female cutting elements,

There has thus been illustrated and described in its preferred embodiment a highly efficient combination of perforating die and striking plate, by which it is intended to eliminate many of the disadvantages of dies presently in use.

Although the foregoing is descriptive of the best known embodiment of the invention together with the matter of its operation, this is intended to be illustrative rather than limitative, and many'modifications within the scope of the appended claims, without departure from the spirit of this invention.

Having thus described this invention, What is claimed as new and desired to secure by Letters Patent is:

1. A die structure of the character described comprising, in combination, a die base, upright cutting elements supported thereby, a plate for said elements to out against, means connecting said plate with the die structure for swinging movement relatively thereto into and out of cooperative relationship to said elements, and

means tending to swing said plate relatively to said die structure.

2..A die structure of the character described comprising, in combination, a die base, upright cutting elements supported thereby, a plate for said elements to cut against, means connecting said plate with the die structure for swinging movement relatively thereto into and out of cooperative relationship to said elements, and means for limiting the swinging movement of said plate away from said cutting elements.

3. A die structure adapted for use in a perforating press comprising, in combination, a die base, upright cutting elements supported thereby, a plate for said'elements to out against, means connecting said plate with the die structure for swinging movement up and down into and out of cooperative relationship to said elements, and means for normally holding said plate in an upper position for the introduction of the work between said plate and said elements, said means permitting the downward swinging movement of said plate by its engagement with parts of the perforating press as the die structure is pushed into cutting position in the press.

4. A die structure of the character described comprising, in combination, a die base, upright cutting elements supported thereby, a plate for said elements to out against, means hinging said plate to the rearward portion of said die structure for swinging movement up and down into and out of cooperative relationship'to said elements, a spring associated with said plate to hold it normally in an upper position, and a stop limiting the movement of said plate by said spring.

' 5. A perforating die structure comprising, in combination, a die base, upright perforating tubes mounted in said base, astripper associated with said tubes, 2. plate for said tubes to out against, means connecting said plate with the die structure for swinging movement up and down toward and from said tubes, and means for swinging said plate, said plate having a cutting surface of a material softer than the cutting edges of the tubes so that'it will not substantially dull the tubes when'they out against the plate.

' LOUIS W. Slit/ESTER.

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