GB2060461A

GB2060461A - Belt-knife Splitting-machine

Info

Publication number: GB2060461A
Application number: GB8030140A
Authority: GB
Original assignee: Maschinenfabrik Moenus AG
Current assignee: Maschinenfabrik Moenus AG
Priority date: 1979-10-22
Filing date: 1980-09-18
Publication date: 1981-05-07
Also published as: IT8068614A0; DE2942612C2; JPS5662789A; FR2467666B1; FR2467666A1; CS220768B2; BR8006757A; DE2942612A1; IT1129192B; GB2060461B

Abstract

A belt-knife splitting-machine has a belt-knife (10) guided in a knife guide (9) which extends across the working width. The knife guide is carried by an upper part (8) mounted on a lower part (7). The lower part is resistent to bending but the upper part consists of sections (11, 12, 13) which are hinged together at (20, 21). The knife guide can be given an appropriate deformation by slightly inclining the sections (11, 13) relatively to the section (12) by means of adjusting devices (22, 23, 24, 25). <IMAGE>

Description

SPECIFICATION Belt-knife Splitting-machine The invention relates to a belt-knife splittingmachine comprising a belt-knife which is guided in a deformable knife-guide extending across the working width; a lower part which is resistant to bending; and a deformable upper part which carries the knife-guide and which is connected to the lower part via adjustable means.

In the case of one known belt-knife splittingmachine of this kind the knife-guide may be given a run which departs from the straight by making the upper part bendable. A material feed gap is arranged in front of the cutting edge of the knife and is bounded by a preferably driven, lower roll and an upper driven roll, which is adjustable in height and preferably also in deflection. As a result, a thickness which differs across the width may be imparted to the useful material which is to be split off. With this construction the thickness of the useful split-off portion can be set independently of the shape and position of the upper roll. The upper roll can therefore be placed with respect to the lower roll in such a way as is most favourable for the conveyance of the material through the machine.The exact thickness of the split-off portion and the variation in the thickness of the split-off portion are then set by means of the knife-guide. In this way splitting errors can be practically totally avoided.

The result is a split material of extraordinarily high accuracy.

In many cases it is desirable to deform the knife-guide more sharply out of the straight position than is possible by bending of the upper part, for example, by 3 mm instead of 1 mm as hitherto. In other cases it is desirable to give the knife-guide a deformation which does not correspond with a line of bend.

The object of the invention is to provide a beltknife splitting-machine of the kind described initially, which allows new possibilities in the deformation of the belt-knife guide.

This problem is solved in accordance with the invention by the upper part consisting of sections connected together via at least one hinge.

By the employment of the hinges deflections of the belt-knife guide from the straight position can be achieved of any sharpness. Nevertheless the angle of bend which occurs in the region of the hinge is so small that it has practically no influence upon the moving belt-knife. For example, the angle amounts for a section 1 m long, which is to be displaced to one side by 3 mm, to less than 0.20. Furthermore the knifeguide has a straight run which allows, for example, the thickness of the useful split-off portion to increase more rapidly across the width than in the corresponding section of a line of bend.

In a preferred construction three symmetrically arranged sections are connected together by hinges. This results in a particularly simple construction which is adequate, however, for most uses in practice.

In this case the centre section in particular may be connected rigidly to the lower part with the adjustable means acting on the outer ends of the side sections. Two hinges are then sufficient.

Preferably the centre section is 30-50 cm long and the side sections are each 60-125 cm long. This leads, in the case of the usual widths of a belt-knife splitting-machine of about 1.5-3 m, to the best results.

Preferably, the gap between adjacent sections when they are in straight alignment is less than 0.3 mm at their upper faces. The gap may even be less than 0.1 mm. One strives to keep the gap so small that no oil or other dirt can reach the beltknife through the gap and thereby get onto the split material. In particular dirt should not be able to penetrate into this gap in the first instance. The small gaps necessary for doing this are possible because the angle of bend is extraordinarily small.

The employment of small gaps is assisted by the distance of the axis of a hinge from the beltknife guide being as small as possible, in particular less than 50 mm.

The or each hinge may include a pivot pin which connects two forklike arms on one hinge section with an arm which is a close sliding fit between the two forklike arms and which is provided on an adjacent hinge section.

Penetration of dirt is thus also impeded.

An example of a machine constructed in accordance with the invention is illustrated in the accompanying drawing, in which Figure 1 is a diagrammatic section through the machine taken on the line A-A in Figure 2; Figure 2 is a front elevation of upper part and lower part; Figure 3 show shapes of the knife-guide achievable with the Figure 2 parts; Figure 4 is a plan of the knife-guide with the cover panel removed and with two of the hinge points partially sectioned; and, Figure 5 is a plan of the knife-guide with the cover panel mounted.

The drawings show a belt-knife splittingmachine only to the extent that is necessary for the understanding of the invention. A work table 2 is supported on a machine bed 1 and the material 3 which is to be split is fed across it. A material feed gap is bounded by a lower roll 4 and an upper roll 5. The lower roll 4 consists of a plurality of individual members which are carried along by the resilient coating on a driving roll which is not illustrated, and pressed upwards by it. The upper roll 5 is supported in a bridge 6 which is adjustable for height and can adopt a desired deflection by backing rolls adjustable in the bridge but which are not illustrated.

At the rear of the belt-knife splitting-machine there is a rigid lower part 7 connected rigidly to it, and above it a deformable upper part 8 which carries a guide 9 for a belt-knife 10. The upper part consists of three sections 11, 12, 13, which consist in each case of a base 14 and a cover panel 1 5 which are connected together by screws 1 6. Wear-resistant guide panels 1 7 and 1 8 which are connected each to the base 14 or cover panel 1 5 respectively, form the actual knife-guide 9.

As is shown in Figure 2, the centre section 12 is fitted rigidly to the lower part 7 by means of screws 19. The two side sections 11 and 1 3 are connected to the centre section 12 each by a hinge 20 and 21 respectively. An adjusting device 22 and 23 respectively in the form of an hydraulic cylinder-piston arrangement which exerts traction engages with the outer end of each. The normal position is fixed by adjustable stops 24 and 25 respectively.

Consequently the knife-guide can, by turning the screws 24 and 25, be adjusted upwards out of its straight position a (Figure 3) in such a way that the belt-knife runs along the line b, and, by turning the screws 24 and 25 downwards, in such a way that the belt-knife is guided along the line c. The lines consist of three approximately straight sections which may also adopt any intermediate positions.

For the formation of the hinge 20 the base of the side section 11 exhibits two arms 26 and 27 arranged like a fork, whilst the base of the centre section 12 has one arm 28 which is received closely sliding between them. A hingepin 29 passes through the three arms. As is shown in Figure 2, the arms and the associated recesses in the respective adjacent part may be designed semicircular. In the same way the hinge 21 has three arms 31, 32 and 33 as well as a hingepin 34.

Because of the movability of the side sections 11 and 13 in relation to the centre section 12, gaps 35 and 36 respectively have to be provided in the region of the hinge between the sections.

Special protection of these gaps against the penetration of oil and dirt may be avoided if the separation a between the sections in the straight position is kept extremely small, that is, less than 0.3 mm or even less than 0.1 mm. This provision can be fulfilled at least when the axes of the hinges 20 and 21 are brought as close as possible to the knife-guide. Preferably the distance b from the knife-guide 9 amounts to less than 50 mm, preferably only 20- 40 mm.

The centre section 12 is advantageously shorter than the two side sections. In the illustrated construction the overall length amounts to L=2 m. In this case the centre section 12 had a length Or2=40 cm, whilst the two side sections 11 and 13 exhibited a length Lt1=L13=80 cm.

Modifications of the illustrated example are possible in various ways. For example, the side sections may be connected at the outer ends by hinges to the machine bed and the centre section be arranged to be movable, in which case appropriate adjusting devices engage with the inner ends of the side sections. It is also possible to provide more than three sections for the upper part 8.

Claims

1. A belt-knife splitting-machine comprising a belt-knife which is guided in a deformable knifeguide extending across the working width; a lower part which is resistant to bending; and a deformable upper part which carries the knifeguide and which is connected to the lower part via adjustable means; characterizedin that the upper part consists of sections connected together via at least one hinge.

2. A machine according to Claim 1 characterized by three symmetrically arranged sections connected together by hinges.

3. A machine according to Claim 2, wherein the centre section is connected rigidly to the lower part and the adjustable means act on the outer ends of the side sections.

4. A machine according to Claim 2 or Claim 3, wherein the centre section is 30-50 cm long and the side sections are each 60-125 cm long.

5. A machine according to any one of the preceding claims, wherein the gap between adjacent sections when they are in straight alignment is less than 0.3 mm at their upper faces.

6. A machine according to Claim 5, wherein the gap is less than 0.1 mm.

7. A machine according to any one of the preceding claims, wherein the axis of a hinge is spaced less than 50 mm from the belt-knife guide.

8. A machine according to any one of the preceding claims, wherein the or each hinge includes a pivot pin which connects two forklike arms on one hinge section with an arm which is a close sliding fit between the two forklike arms and which is provided on an adjacent hinge section.

9. A machine according to Claim 1, substantially as described with reference to the accompanying drawings.