SU546267A3 - Device for cutting and punching sheet material - Google Patents

Description

The gear unit (not shown) with the main driving unit of the machine is designed to rotate the lower shaft 4. Two filling rollers 8, 9, two elongated rollers 10, 11 and support roller 12 are mounted on the shaft 4. All rollers mounted on the lower support shaft have same diameter and can rotate at a peripheral speed equal to the speed of processing the sheet. Three free-swinging elements 13, which serve to guide the sheets, are also mounted on the lower shaft.

The upper part 14 of the beetling assembly rests on the shaft 15, which is attached at both ends in the machine body. On the upper shaft 15, four leaflet rollers 16, 17, 18 and 19 are fastened, which can rotate with the shaft, and the entire upper part of the assembly is pressed down so that the upper filling rollers are in frictional contact with the lower filling rollers by means of springs 20 and 21 mounted on a fixed support plate 22, as a result of which a sheet of paper 1 falling into the gap between the rollers passes at a set speed.

The cutting tool 23 is mounted on the upper shaft 24 so that it has the ability to change its position along the shaft. The central part of the shaft has a rail 25 which fits inside the guide slot in the holder 26 of the cutting tool (Fig. 2).

The cutting tool 23 is equipped with a double eccentric holder 26, on which the perforated 27 and cutting 28 knives are mounted. In this case, the cutting knife 28 is mounted on the holder of the perforation knife 27 with the possibility of contact with its side surface by means of a clamping ring clamp 29 and a washer 30. The knives 27 and 28 are located eccentrically relative to the axis of the holder and are offset one from another. The cutting surfaces of the knives are perpendicular to the line of movement of the paper. The centers of the eccentric bearing surfaces of the perforating knife 27 and the cutting knife 28 are located on radii passing through the axis of the support shaft 24 under an angle of 120 ° to each other.

The upper shaft 24 is provided with a mechanism 31 for mounting the shaft, and, therefore, the cutting tool 23 in a certain position. The mechanism consists of a plate 32 and a holding member 33 mounted at one end in the wall 34 of the machine body, and has a protruding pin 35, which is held by a spring. The pin can fall into three installation grouts in the plate 32, made with great accuracy. In one position, the eccentrically mounted cutting knife 28 protrudes downward and is in contact with the support roller 1.2 (Fig. I). In this position, the knife 28 serves to perform continuous longitudinal cutting of the paper / passing through the sheet-rolling unit, with the cut line 36 parallel to the direction of movement of the sheet of paper 1. At this time, the punching knife 27 is raised and does not participate in the work.

In another position, the shaft 24 can be turned 120 ° and fixed with a pin 35, while the punching knife 27 protrudes downward and contacts the support roller.

12, and as the sheet material progresses, the knife 27 applies to the sheet a series of interrupted cuts, which allow the sheet to be easily broken along the perforated line.

Preferably, the ratio of the length of the jumper to the length of the incision is about 1: 5.

In the third position of the shaft 24, when rotated by 120 °, both knives 27 and 28 are out of contact with the support roller 12 and cutting

not produced.

The device also allows the cutting tool 23 to be rearranged in the longitudinal direction on the upper shaft 24, for which an indicator scale 37 is applied on the central part of the shaft 24, with which the operator can easily rearrange the knife by a predetermined size, raising the support plate 22 against the pressing force and arms 20, 21 to free the knife from contact with

support roller 12.

Claims (2)

1. A device for cutting and punching a sheet material, comprising a disk punching knife mounted on a holder mounted on a shaft with the possibility of changing its position, a cutting disk knife, a support roller mounted on a shaft, and means for transporting sheet material, characterized in that , in order to simplify the design, the cutting knife is mounted on the holder of the perforating knife with the possibility of contact with its side surface, while the blades are located eccentrically relative to the axis of the holder and see scheny relative to one another. 2. An apparatus according to claim 1, wherein the means for transporting the sheet material comprises several pairs of rollers, one of the rollers of each pair being mounted on the carrier shaft and the other on the roller shaft. gz