SU1388328A1 - Sheet cutting device - Google Patents

Abstract

The invention relates to cardboard production, is part of a cardboard machine that produces multi-layered types of paperboard, and is intended for cutting finished sheet into consumer formats. It improves the quality of cutting large format sheets. The upper knives 2, turning in a hinged connection under the influence of the pneumocystitis: lindrov 10, make a transverse cut. In order for the knives 2 to close along their face edges, the adjusting axis is turned, while the sleeve displaces the knife in the direction of its length. The guiding device ensures reliable fit of the upper and lower knives at the moment of cutting. Directed ju; and the plate has an upper section with a slope of 5-8 and a tangential work surface. 1 hp f-ly, 4 ill. o (l

Description

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The invention relates to cardboard production, is part of a cardboard machine, which produces multilayer board types, is intended for cutting finished sheet into consumer formats and can be used in the stitching shops and building materials industry.

The chain of the invention is to improve the quality of cutting large format sheets.

Fig „1 shows the device, general view; in fig „2 - section aa in fig, 1 in fig.Z - section bb in figure 1; Fig, 4 - section bb In Fig.Z.

The device contains a slitting mechanism with a roller table and a cross-cutting mechanism with the top 2 and bottom 3 knives. The upper knives 2 are made in the form of two symmetrical plates, each of which is pivotally connected to the knife 3. The hinged connection 4 is an eccentric sleeve 5, and an adjusting axis 6 installed in the sleeve 5 and rigidly connected with it by a pin 7. The axis 6 has turnkey shank. Means are provided for guiding the upper blades, comprising spring-loaded rollers B, mounted on the blades 2, and a guide plate 9 mounted along the axis of the device. The upper portion of the plate 9 in the contact zone with the rollers 8 is made at an angle of 5-8. The lower portion of the guide plate 9 is made according to a tangential dependence. Upper knives 2 are connected to pneumatic cylinders 10,

The device works as follows:

After longitudinal cutting live rolls

1 feeds the sheets to the cross cutter. The upper knives 2, turning in a hinged connection under the influence of pneumatic cylinders 10, make a transverse cutting of the sheets. Two knives allow the cutting of sheets of paperboard with a width greater than

2m without increasing metal intensity

and air pressure in the pneumatic system, Dp so that the knives 2 at the end of the cut are closed along their front edges, a swivel connection with the eccentric sleeve 5 is provided. When adjusting, the axis 6 is turned and the sleeve 5

due to eccentricity, it shifts but in the direction of its length.

The guide means ensures that the knives 2 and 3 fit snugly together at the time of cutting. Due to the fact that the roller rolls around the bevel of the plate 9, in the upper non-working position, the knives 2 and 3 are separated in the area of their mutual overlap a. This is necessary to prevent knives from tilting.

When the knife is in the upper position, the overlap is ensured by a minimum clamping force from the spring-loaded roller. When the knife moves, this force rises to the minimum that ensures the quality of the cut. The upper portion of the plate is inclined toward the vertical at an angle of 5–8 (determined experimentally). An angle of more than 8 causes greater forces at the starting point of the cut, and an angle of less than 5 does not provide the necessary pressing of the knives. As the cutting point moves across the machine, the value of the thrust force increases in proportion to the tangent of the angle of rotation of the knife. Correspondingly, the pressing force from the roller also increases, ensuring reliable

contact between knives.

Claims (2)

1. A cutting device containing a slitting mechanism mounted on a frame, a roller conveyor and a cross-cutting mechanism having upper and lower knives pivotally connected to each other, characterized in that the cutting chain of a large format sheet has an installed CHM metrically with respect to the first additional upper knife, which is hinged to the lower knife, and means for guiding the upper blades, comprising a guide plate fixed to the frame and mounted tipped on the upper blades with the possibility of contact with the latter spring-loaded rollers, each articulated joint being an eccentric bushing and an adjusting axis rigidly fixed in it, 2. The device according to claim 1, about tl and is that the guide plate has an upper section with a slope of 5 - 8 ° and a tangential working surface. /one-/  ytttfcmffH ff / tteroi - yifOcmoH FIG. 2 CpLt8.