DE1253860B - Spiral cutting machine for producing a strip intended for use as a shoe frame - Google Patents

Description

Spiral cutting machine for making one for use as a shoe frame provided strip The invention relates to a spiral cutting machine for manufacturing a strip cut out from a plate made of leather, plastic, rubber or the like for use as a shoe frame.

Devices of this type are known, with the help of which circular Cut material panels from the edge inwards over a fixed knife in spiral strips, by hand by continuously pulling on the cut Belt or machine by rotating the poorly attached to the work table Plate to be cut up. In a further known device, the cutting tool leads a circular and radial movement at the same time when the material plate is fixed off, the radial advance of the tool from the rotary movement of the gearbox is derived. The aforementioned devices have the disadvantage that as a result Due to their design, only material panels can be processed that are circular are cut to a strip that is uniform in width from the start to be able to manufacture. In addition to the additional work step of preparing the material plate there is another disadvantage, as the plates because of the central fastening can not be cut so lossless on the work table that none additional pieces of waste arise.

One of the known devices allows the material plate to be cut open from the inside to the outside, but instead of the circular cut, the The punching out of a larger, circular hole in the middle of the plate Plate necessary to enable a corner to be cut.

The invention overcomes these disadvantages and proposes manufacturing Spirally cut strips for shoe frames a device that consists of a rotatable, controllably driven work table for receiving the sliced Material plate and one driven with a variable feed rate Carriage, on which the cutting knife is clamped, consists, the carriage through guide rods running across the worktable is guided and from the center of the work table to the outside and vice versa from the outside can slide inwards. With such a device the Cutting open the material plate from its center outwards without additional Preparation of the material plate and additional material waste achieved.

Another advantage of the device according to the invention over the known consists in the fact that several carriages are provided, each with a knife can be, so that during the operation of a slide the return of a other slide can take place. Also can according to a further feature of the invention on the or on the slide tools can be arranged during the cutting process on the top of the strip a plastic ornament, z. B. by knurling, cutting or the like. Generate.

In the drawing, the invention is illustrated using an exemplary embodiment, namely shows A b b. 1 shows the device according to the invention for producing the strips in side view.

A b b. 2 the same device in view from above, A b b. 3 the material plate with the strip cut out in the form of a spiral in plan view, A b b. 4th and FIG. 5 different embodiments of the strip in a perspective illustration.

a is made of leather, plastic or rubber, preferably hard cellular rubber, existing plate of any outline shape and one of the strips to be produced appropriate thickness. A strip of the desired width is made from the plate continuously cut out in spiral windings (A b b. 3).

The strip b thus obtained from the plate a is rectangular Cross-section (A b b. 4). By reworking, e.g. B. on a sharpening machine or grinding machine, you can of course add a different cross-sectional shape to strip b afterwards, z. B. by a wedge-shaped bevel or by forming a bead will. According to the invention it is possible. the strip b at the same time when cutting out on its entire surface (A b b. 5) or on part of its surface Deform, e.g. B. knurling, cutting or the like. To decorate plastically.

To produce the strip b, the process shown in A b b. 1 and 2 shown device according to the invention is used. It consists essentially of a rotatable work table d driven by the electric motor c and two guide rods e assigned to it in such a way that with one in a variable feed from the electric motor t via change gears g and the threaded spindle;: driven slide i between guide rollers I. clamped knife k from the center of the work table d from one or more plates a placed on it and fixed at will by a cut x running in spiral windings (see dashed line in A b b. 2) into a continuous strip b without loss .

Instead of one knife carriage i, two of them can also be placed on the Guide rods e are arranged in such a way that when the one slide to the outside drives and makes the cut, the other walks inwards without cutting and arrives in the middle of the work table d when the first carriage completes the cutting operation has finished. In this way, changeover time can be saved.

The fixation of the plate a or the plates a on the work table d can be arbitrary, for. B. by clamping, tacking od. Like. Take place. One can also create surfaces by cutting off the panel corners not detected during spiral cutting (see A b b. 3, dashed line, and A b b. 2) which, in conjunction with stops m on work table d, counteract the loosely placed panels a during the cutting process Secure twisting or slipping. Cutting off the corners also has the advantage that the work table d can be kept smaller in diameter. It is of course also possible to prevent the plates a from twisting or slipping through the stops m by hitting the plates with their long sides and leaving their corners.

By attaching a suitable forming tool to the knife carriage When you cut out the strip b, this can be carried out over its entire length at the same time or decorate part of its surface plastically.

Claims (3)

Claims: 1. Spiral cutting machine for producing one from a plate made of leather, plastic, rubber or the like. Cut-out strips for Use as a shoe frame, due to the fact that it consists of one rotatable, controllably driven work table (d) - to accommodate the Material plate (a) - and one driven with a variable feed rate Slide (i), on which the cutting knife (k) is clamped, consists, wherein the carriage (i) by above the work table (d), running across it Guide rods (e) is guided and from the center of the work table (d) to the outside and vice versa can slide from the outside to the inside. 2. Spiral cutting machine according to claim 1, characterized in that several carriages (i) each with one clamped Cutting knife (k) are provided. 3. Spiral cutting machine according to claims 1 and 2, characterized in that on the or on the carriage (i) and tools are arranged, which during the cutting process on the top of the strip (b) a plastic ornament, for. B. by knurling, cutting or the like. Can generate. Considered publications: German Patent Nos. 314 156, 660 588, 514 525; French Patent No. 1123 570; U.S. Patent No. 2,874,774.