US1791320A - Apparatus for cutting cardboard and similar substances for decorations of shop windows and sceneries - Google Patents

Description

Feb. 3, 1931. H MULLER 1,791,320

APPARATUS FOR CUTTING CARDBOARD AND SIIILAR SUBSTANCES FOR DECORATIONS 0F SHOP WINDOWS AND SCENERIES Filed June 15, 1928 Patented Feb. 3, 1931 uurrsn STATES PATENT OFFICE HERMANN Mfi'LLER, OF SIEGEN, GERMANY, ASSIGNOR TO HERMANN LEWINSOHN, F

SIEGEN, WESTPHALIA, GERMANY APPARATUS FOR CUTTING CARDBOARD AND SIMILAR SUBSTANCES FOR DECORATIONS OF SHOP WENDOWS AND SCENERIES Application filed June 13, 1928, Serial No. 285,094, and in Germany December 30, 1927.

This invention relates to an apparatus for cutting cardboard and similar substances for decorations of shop-windows and sceneries, and further for cutting characters, words and figures directly into the cardboard.

Hitherto this cutting has either been carried out by hand with a suitable knife or by means of an endless saw. The cutting with a knife by hand is very fatiguing and requires much time, and on the other hand an endless saw is seldom at disposal in theaters and business in which the decorations have to be used, and it is scarcely worth while to buy an endless saw as it has to be used only occasionally. Owing to the necessity to transport the material to and from the workshops in which an endless saw is at disposal, this would be too expensive and requires too much time. A. further inconvenience is that the saw forms on the rear-side of the cut an irregular edge. It is further not possible to obtain sharp edges at the cutting of characters by means of a saw or the like. The bodies to be cut out have sometimes to be out from comparatively large sheets and it is very troublesome to handle such large sheets in an endless saw.

All these inconveniences are avoided by the invention, according to which a small size machine is used for cutting decorations from cardboard or the like. This machine is mounted on a support constructed to form a handle and on which an electromotor is mounted which in rapid succession drives, I through the intermedlary of a crank or eccentric, a small knife moving in the foot, of the support and being rapidly moved up and down to cut through the material. The small size machine is moved on the cardboardsheet by hand the knife being guided along the contours of the body to be out. In this manner it is possible to cut out any body rapidly and easily. As the knife, owing to its shape, carries out a drawing-cut no burrs are produced on the back of the cardboard.

An embodiment of the invention is illustrated, by way of example, in the accompanying drawing in which Fig. l is a front-elevation of the machine.

Fig. 2 is a side-elevation.

Figs. 3, 4- and 5 show on larger scale different forms of construction of the foot of the support for carrying out special work.

The support a of the machine has a foot 2), which has at the middle a cut out portion 0 for the tool. On the support a an electromotor is mounted in a casing d. On the motor-casing a switch e for the electric wire f is arranged.

On each end of the shaft 9 of the motor an eccentric disc 2' is keyed on the outer sides of the-bracket h, driving rods It being mounted on said eccentric discs. These driving rods serve to convert the rotating movement of the motor into a straight reciprocating moveinlent without the use of spur-wheels or the The driving rods 74 are both hingedly connected to a transverse rod Z.

In the top-portion m of the support a a, slot is arranged in which the transverse rod Z can moveup and down.

The support a is hollow and in the same a vertical rod a is located which is fixed to the transverse rod Z and carries on its lower end.

a cutting tool 0 located in the cut out portion 0 of the foot 6.

The cutting tool consists of a sharp knife which can be removed and ground. When the motor is started, the knife 0 is rapidly moved up and down. A spiral-spring p in the h0llow support a serves for equalizing the masses so that the machine can be tilted to remove the tool rapidly from the sheet of cardboard or the like.

In the foot 6 a bar It having a downwardly projecting point 1" is inserted so that it can be shifted in longitudinal direction. The point 7" serves as center of a circle which has to be cut. The bar If is connected to a rod 14 mounted in a hub v of thefoot b so that it can be shifted in horizontal direction. A screw 10 serves for securing the rod 10 in its adjusted position. The point r can thus be pulled out a comparatively long distance.

I claim:

1. A machine for cutting figures from sheets of cardboard and similar material for shop Window and stage decorations, comprising a vertical hollow support adapted to be gripped to guide the machine like a hand tool over the materal to be cut, a foot for said support having a cut out portion at the middle, a vertically reciprocable rod guided in said hollow support, said rod carrying a knife in its lower end, a casing mounted centrally on the upper end of said support, a motor in said casing, an eccentric at each end of said motor, a cross piece on the top end of said rod, and connecting rods connecting said eccentrics to said cross piece.

A machine as specified in claim 1, comprising; in combination with said vertical roo, a. shoulder on said rod, and a spiral spring wound around said rod reacting against said shoulder for reducing vibration.

3. A. machine as specified in claim 1, comprising in combination With the foot of th support, a plate shiftably mounted in said foot, a compass point in the lower surface of said plate, a hub on the rear end of said foot, a rod shiftably mounted in said hub, said plate hingedly fixed to said rod, and means for securing said rod in its adjusted position.

4. A machine as specified in claim 1, comprising in combination with the foot of the support an inclined arm rearwardly projecting from said foot designed to support the machine in a tilted position and permit sliding over the surface of the material Without stopping the motor.

In testimony whereof I affix my signature.

HERMANN MULLER.

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