DE2452201A1 - Pressure-operated knife holder - gives sideways knife movement resulting from downward stroke of piston - Google Patents

Abstract

The pressure-operated knife holder is for use in roll-cutting machines, the circular knife (3) being lowered on to the strip material to be cut, and at the same time moved sideways against the edge of a mating knife. The sideways movement is effected mechanically, and forced as a result of the pressure-operated downward stroke of the piston (4). The piston can be only single-acting, the return stroke being affected by springs (6, 8, 14). The design allows the amount of sideways movement to be accurately preset to a constant value.

Description

"Pressure-medium-operated knife holder" Pressure-medium-operated knife holder for roll cutting machines.

The invention relates to a pressure medium-operated knife holder for Longitudinal cutting machines for cutting e.g. paper, plastic, rubber or fabric webs, he compared to the already known designs for the lowering movement of the knife on the material web and for the lateral adjustment to the cutting edge of the counter knife only one pressure-actuated piston is required for the lowering movement.

The lateral adjustment movement is due to the structural design of the components of the knife is a mechanically induced compulsory sequence of the lowering movement. On mechanical Paths are guaranteed, triggered by the demonstration of the KolDens with a Pressure = medium, that shortly before reaching the lower adjustable end position of the Piston has a lever arm shifted in the longitudinal direction of the piston rod Kegel experiences a dimensionally fixed deflection.

The backward movement takes place in such a way that by removing the pressure medium the pressure spring counteracting the pressurized piston re-engages the piston returns to its rest position.

This inevitably relieves the cone and its own counter-pressure springs returned to its rest position. At the same time there is no need for the lever arm Side pressure and its counter pressure spring return it to its original position.

The invention is illustrated in FIG. 1 in axial section and in FIG Explanation of the embodiment shown in side view in the rest position.

The knife holder essentially consists of the basic device 1, the actual knife holder, and the one that can be replaced as required by screwing Knife storage 2 with the circular knife 3 For reaching the working position the piston 4 via the pressure medium connection 5 with a preferably gaseous or liquid pressure medium is applied and presses against its counter pressure spring 6 "Pressure medium actuated Knife holder "By a built into the piston rod 7 and by pressure = springs, preferably disc springs 8 loaded adjusting screw 9 is the lowering movement of the Piston limited by the fact that a to Kolhenstanqe 7 at right angles in an elongated hole the piston rod arranged stop bolt 10 by turning the adjusting screw 9 is adjusted in piston rod alignment and by lowering movement shortly before reaching the working position touches the inner edge of the lower cylinder cover 11.

When placing the stop block 10 on the edge of the lid 11 the disc springs 8 under the pressure of the piston 4 until their spring travel is exhausted is. At the lower end of the adjusting screw 9, a cone 12 is attached so that it in the rest position the lever arm 13 rests without pressure. By moving the Stell = screw 9 when placing the stop bolt 10 on the ceiling = edge 11, counter the movement of the piston rod 7, the cone 12 causes a lateral deflection of the lever arm 13 around the pivot point 15.

Due to the dimensionally limited movement of the adjusting screw 9 and through the dimensional Festiegund of the cone 12 is the deflection of the lever arm 13 dimensionally condemned.

When the piston returns, the stop pin 10 and thus the Adjusting screw 9 and the cone 12 relieved. The leaf spring attached to the lever arm 18 14 causes the lever arm 13 to move in when the pressure is released by the cone 12 his @@ production. The lever arm 13 takes, designed as a double lever, in his the screw connection of the knife = bearing 2 on the lower, shorter part. The through the Cone 12 caused sides = deflection of the ebelarne 13 is thus forced to run transferred to the cutting edge of the circular knife 3 and also causes the opposite direction here Lateral rash.

Due to the shape of the channel 12, in contrast to the previous known designs the side adjustment shortly before the end of the lowering movement of the piston 4 started.

Claims (3)

"Pressure fluid operated knife holder" Claims pressure medium-operated knife holder with a lowering = movement of the circular knife 3 on the goods to be cut = web and a Seitenanstelluno of the circular knife 3 to the cutting edge of a blessing knife, characterized in that that the side adjustment of the circular knife 3 to the cutting edge of the counter knife a mechanically conditioned 7wangsfoloe of the pressure medium-related lowering movement of the Piston 4 is. 2. Knife holder according to claim (1), characterized in that for the compulsory sequence of movements only i n unilaterally acted upon with pressure medium piston 4 is required and the return movement by counter = compression springs 6, 8 and 14 is effected. 3. Knife holder according to claims (1) and! 2), characterized in that that caused by the combination of pressure medium + mechanics compulsory Sequence of movements a dimensionally to be determined, always the same lateral deflection is achieved. For this 1 sheet of drawing. Considered publications: German patent specification 10 24 341 German patent specification 11 56 635 USA - patent specification 2,571,201 USA - patent specification 2,554,027 L e r s e i t e