US1730821A - Caoutchouc-cutting device - Google Patents

Description

ons, 1929. iF. KEMPTER f l'1,730,821

- CAOUICHOUC CUTTING DEYMEE "Fi-19 'April 26. 1924 y i., i

Patented Oct. 8, 1929 UNITED STATES PATENT `OFFICE FRITZ KEMPTER, OF STUTTGART, GERMANY CAO'UTCHOUC-CUTTING DEVICE Application led April 26, 1924, Serial No 1u side faces of which the caoutchouc will adhere 'i fso that the cutters "must overcome a com- "paratively great" resistance in cutting and, when moving rapidly, will cause the caoutchoucto-be unduly heated. It has already i been proposed to force the block of raw caoutchouc into a system of thin stationary cutters having. a length equalling t-he height of the block. However, cutters of this kind are rather fragile and are liable to be damaged by the foreign bodies present in the caoutchouc. Moreover, the slices of caoutchouc can be removed from between the knives only with great difficulty.

The device according to the present invention comprises a wedge-shaped cutter arranged to be moved by means of a piston acted upon by a suitable pressure medium, this cutter being preferably short and adapted to force the cut faces ofthe caoutchouc apart directly at the rear of the slit,thus preventing considerable frictional resistance from arising. Any foreign bodies which may be present in the raw caoutchouc-:can give Way without injuring the cutter'which, owing to its particular form, is far more resistive than an ordinary knife blade.

In the drawings affixed to this specification and forming part thereof a device embodying my invention is illustrated'diagrammatically by way of example. In the drawings Fig. 1 is a front elevation and Fig. 2 a side elevation of a hydraulic cutting device, while Figs. 3 and 4 are cross sections of different forms of a cutter:

The bed plate a carries two standards b serving as guides for a die s carrying the cut* ter which may consist of a wedge-shaped body e and a removable cutting blade c fixed 709,317, and in Germany August 18, 1923.

to it by means of screws or the like and capable of being easily reground.

The wedge-shaped carrier may have a symmetric cross section, as shown in Fig. 3, or an asymmetric one (Fig. 4) In the latter case, oneof its faces (the one carrying the cutting blade c) extends in parallel to the plane of movement of the cutter, while the other face is disposed at an acute angle. The body portion e is removably attached to the piston of a hydraulic press, this piston being `arranged for reciprocation in the cylinder d.

In the operation of this device, the block of caoutchouc to be split into slices is sim ly placed on the bed plate underneath the we ge which is now forced down upon it and, owing to its particular configuration, causes the single parts to be forced outwards.

The bed plate a may either carry a Wooden support which the blade can easily enter into, or else a slot can be provided in the bed plate.

At some distance above the bed plate a there is arranged a frame L carrying rollers f resting on rails g. The caoutchouc block placed in this frame is'fed forward with it after each stroke of the carrier and the slices separated from the block rest on the frame h until the' block is fully divided into slices, whereupon the frame is caused to move into its end position shown in dotted lines on the left hand half of Fig. 2, where it projects beyond the edge of the bed plate, thereby allowing the slices of caoutchouc to drop into a portable container z'.

Preferably, this cutting device is operatively connected with a hydraulic accumulator of the kind generally used in rubber mills,` and, in that case, the control mechanism must be arranged for easy variation of stroke and for automatic return of the piston. However, the wedge-shaped carrier can as well v be moved by means of a lever or a screw spindle and, instead of movin vertically, the device as a whole might as we l be arranged in horizontal or inclined position.

With a cutter, such as shown in Fig. 4, in which the face extending in parallel to the plane of motion faces the piece of caoutchouc to be subdivided, this latter will not be forced 100 back by the wedge, but will remain in place during` the cutting.

I Wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for obvious modicatlons will occur to a person skilled in the art.

A caoutchouc cutting machine comprising a bed plate, a plunger adapted to reciprocate vertically with respect to said bed plate, a spreading Wedge connected to said plunger the size of the base of said Wedge Where it is connected With said plunger being larger than the diameter of said plunger, and a cutter secured to s aid Wedge. I

In testimony whereof I affix my signature.

FRITZ KEMPTER.

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