DE1793933U - DEVICE FOR CUTTING THIN PLASTIC FILM. - Google Patents

Description

Annex 1 to the letter dated June 22, 1959 in the matter of B 35 283 / 39a Gm device for cutting thin plastic films is the subject of the present utility model is a device for cutting thin plastic films, which is marked is a tensioning device through a feeding device that feeds the film into the apparatus, through which the film is stretched during the cutting process, a cutting knife, which is set with its cutting edge at an angle like a shear knife, so that the The cutting process is always punctiform, a thin slit through which the film is tensioned during the cutting process and by a device for transporting it away of the cut foils. The cutting device expediently consists of several Part knives which are arranged in such a way that the tips of all part knives at the same time hit the foil and the slot after cutting through the foil the cutting edges all partial knife takes up. The jig is expediently on one Side of two rollers through which the film is pulled off the spool and forward and on the other side of at least one with the cutter bar connected hold-down device.

When cutting films with a relatively high degree of elasticity should, offers the .....

Foil when cutting with a longer cutting knife a relative high resistance, while when using a multi-section knife Device lightly at those points where the partial knives meet, bridges from film material remain, as a complete overlap of the individual Part knife is not easily accessible. The bridges mentioned only own a very narrow width; however, they can be eliminated in the case of highly elastic films to trouble. The present device is particularly intended for cutting of highly elastic foils are used and the cutting process in foils of the mentioned Kind of performing in an impeccable manner.

In order to solve this problem, the cutter bars in the present device are arranged to be movable in the cutting direction and are moved in the cutting direction during the cutting process, that also those places on the foils where otherwise the formation of bridges is possible from the Cutting edge of the cutting device are detected, - && -. In the accompanying drawing, FIGS. 1 and 2 show the drawing each has a cutting device, the In the embodiment of FIG. 1, the cutter bar is attached above the support table (9) and in the device of FIG. 2 below the support table (9).

The cutter bar is movably arranged on pistons moving up and down. When the piston moves, a run-off roller slides past an inclined surface and gives the knife an arcuate movement during the cut, while the knife on the return movement by arranged at the opposite end Springs is pushed back into the starting position.

In the figures, (1) means the piston for the upward and downward movement in the cylinder; (2) the cylinder; (3) the cutter bar with the knives; (4) the Run-off role; (5) an inclined surface for the stroke of the sideways movement; (6) the Bridge for connecting the pistons (1); (7) the slide rails for the cutter bar ; (8) the return springs for the cutter bar; (9) 2 hold-down clamps for pressing on and tensioning the film during the cut.

In FIG. 1, the cutter bar is, as already mentioned, above of the support table (9) arranged. The drain roller (4) runs during the cutting process - past the inclined surface (5) and press the knife bar with the knives (3) To the right. The springs (8) and (9) press the cutter bar (3) during upward gear back to the starting position to the left.

The following should be noted about FIG. 2: The arrangement of the cutter bar (7) is below the support table (9). When the pistons (1) move down the piston (3) is actuated upwards by the piston (4) using the rocker arm (2) and the cutter bar (7) on an inclined surface (5) by means of a pulley (6) pushed sideways. This will cause the knives to pass through you in the Small slot attached to the support table (9).

During the downward movement of the pistons (1), 2 hold-down devices are released at the same time (8), which are arranged in front of and behind the slot in the support table, on the support table pressed on, whereby the film is stretched and the cutting process is accomplished.

Both in the arrangement of Figure 1 and the arrangement of the figure 2, an arcuate cutting movement is created by means of the blades, which can be moved in the cutting direction executed, especially in the case of elastic foils, the small spaces bridged between the individual joints of the knives mounted in the cutter bar will. Protection claims:

Claims (1)

Annex 2 to the letter dated June 22, 1959 in matters B 35 283 / 39a Gm Protection claim: device for cutting thin plastic foils, characterized by a, 4, -the slide in the apparatus introductory feeding device, one the slide during the cutting process tensioning device, a cutting knife set with its cutting edge at an angle like a shear knife, a movably arranged knife bar that guides the cutting knife laterally in an arc shape during the cutting process, a thin slot over which the film is stretched during the cutting process and a device for transporting away the cut films . 2. Device according to claim 1, characterized in that that the cutter bar is moving up and down Piston is movably arranged, with the cutter bar With the help of a roll-off roller and an inclined surface shifted sideways when going down and when going up spring back to the starting position is brought.