GB2031040A

GB2031040A - Shrinking Textile Fabric or Paper

Info

Publication number: GB2031040A
Application number: GB7838170A
Authority: GB
Original assignee: Hunt and Moscrop Ltd
Current assignee: Voith Paper Ltd
Priority date: 1978-09-26
Filing date: 1978-09-26
Publication date: 1980-04-16
Also published as: GB2031040B; IN151371B

Abstract

A textile fabric or paper shrinking machine in which an endless elastically-extensible belt 15 travels over front and back idling rollers 1, 13 and is driven by a third roller 6 which applies pressure to the belt, the textile fabric or paper being shrunk by the contraction of the belt after passing through the nip between rollers 1, 6, characterised in that the roller 1, Fig. 1, or the roller 6, (Fig. 3), is mounted in a block moveable in a horizontal direction to vary the arc of contact of the belt 15 with the driven roller 6, the driven roller 6 being mounted on a vertical slide 8 with adjustment to vary the nip between the driven roller 6 and the roller 1, the rollers 1, 13, 6 being mounted in an open sided frame to facilitate the changing of the belt 15. <IMAGE>

Description

SPECIFICATION Improvements in Textile Fabric or Paper Shrinking Machines This invention relates to improvements in textile fabric or paper shrinking machines of the type in which an endless belt travels over front and back idling rollers and is driven by a third roller which applies pressure to the belt the textile fabric or paper being shrunk by the contraction of the belt after passing the nip between the pressure roller and the front roller.

In known machines a variation in the arc of contact between the driven roller and the endless belt has been achieved by varying the position of the rear roller in a vertical and horizontal direction and that by reducing the arc of contact from that normally employed, a predetermined shrinkage can be obtained with less pressure than hitherto.

We have now found that by altering the arc of contact by varying the position of the front roller in the horizontal direction a given contraction or shrinkage can be obtained, with less pressure, by reducing the arc of contact, and also that by varying the arc of contact by variable positioning of the front roller a greater degree of variation in the finish implanted to the fabric can be obtained.

The same effect can be obtained by varying the position of the driven pressure roller in a horizontal direction.

According to the invention a textile fabric or paper shrinking machine of the type referred to comprising a front roller mounted in a block moveable in a horizontal direction to and from a driven roller to vary the arc of contact of the belt with the driven roller, the driven roller being mounted on a vertical slide with adjustment to vary the nip between the driven roller and the front roller, the front, rear and driven rollers being mounted in an open sided frame to facilitate the changing of the belt.

Thq invention will be described with reference to theiaccompanying drawings.

Fig. 1 is a side elevation of a shrinking machine showing the front roller manually adjusted in a horizontal direction; Fig. 2 is a side elevation showing the method of tensioning the belt hydraulically; Fig. 3 is a side elevation showing the driven roller manually adjusted in a horizontal direction and the belt grinding apparatus; Fig. 4 is an end elevation of the machine.

In the arrangement showing Fig. 1 and 2 the machine comprises an open sided frame A on which is mounted a front idling roller 1 mounted n blocks 2 at each side of the machine, each block 2 being carried on a horizontal slide 3 on which it may be moved horizontally by a screw 4 the amount of movement being governed by stops 5.

A roller 6 driven through a universal joint 6a from a main drive is mounted in blocks 7 at each side of the machine each block being carried on a vertical slide 8 on which it is moved vertically by a ram 9 of an hydraulic cylinder 11 the amount of movement downwards being determined by micrometer stops 12 which control the nip between the roller 1 and the driven roller 6. A rear idling roller 1 3 is mounted in blocks 14 at each side of the machine each block being carried by the horizontal slide 3. An endless belt 1 5 passes over the idling rollers 1 and 13 and under the driven roller 6.

In Fig. 2 the roller 13 mounted on the blocks 14 is moved by a ram 16, operated by an hydraulic cylinder 1 7 supported in brackets 1 8a affixed to blocks 14, the ram 16 being connected to brackets 19 affixed to the blocks 2. The tension on the belt 1 5 is controlled by the hydraulic pressure applied to the cylinder 1 7.

As shown in Figs. 1 and 2 the position of each block 2 is adjustable each block being moved horizontally on the slide 3 to vary the horizontal distance between the driven roller 6 and the front roller 1, the distance being controlled by the stops 5. The stops 5 are of varying lengths to give one of a plurality of differing centre distances to obtain various arcs of contact of the belt 1 5 with the driven roller 6. Each block 14 is moved horizontally along the slide 3 by the ram 1 6 and hydraulic cylinder 1 7 thus applying tension to the belt 1 5. The driven roller 6 mounted in the blocks 7 is moved down the vertical slide 8 by the ram 9 to form a nip between the roller 1 and the driven roller 6 the amount of nip being governed by the micrometer stops 12.

In the arrangement shown in Fig. 3 the front roller 1 is supported in the blocks 2 which are mounted at each side of the machine on the open sided frame A. The driven roller 6 mounted in the blocks 7a each block being carried on brackets 1 8a. Supporting a horizontal slide 1 9a on which the blocks 7a are moved horizontally by a screw 20a the amount of movement being governed by stops 21 a.

The brackets 1 8a are carried on vertical slides 8 and are moved vertically by the ram 9 operated by the hydraulic cylinder 11 the amount of movement downwards being again governed by the micrometer stops 12 which thus control the nip between the roller 1 and the driven roller 6 as in Figs. 1 and 2.

The endless belt 1 5 and the rear idling roller 13 again supported in the blocks 14 at each side of the machine each block being carried on the horizontal slide 3. The tension on the belt is obtained as described with reference to Fig. 2.

From time to time the belt 1 5 requires grinding and a grinding cylinder 24 which contacts the belt is mounted to be moved into or out of contact with the belt by screws 25.

The mounting of the rollers 1, 6, 13 on the open sided frame A allows for the belt 1 5 to be removed from the rollers without removing the rollers or framework which enables a belt to be changed in under one hour whereas with existing machines such a change was in the region of five hours. Furthermore, this rapid changing of the belt enables narrow belts to be employed for narrow width fabrics and wider belts for wider fabrics instead of having to run narrow fabrics on a wide belt which is uneconomical bearing in mind the cost of wide belts as against narrower belts and the necessary regrinding of the belts which must be carried out after the processing of a predetermined length of narrow fabric on a wide belt.

The geometry of the rollers is such that the arc of contact can be varied between 0 to 78 degrees whereas on previous machines the maximum variation was 35 to 76 degrees of contact.

Automatic belt guiding mechanism may be employed thereby obviating manual adjustment by an automatically controlled movement of roller 23.

The belt grinding mechanism may be permanently mounted on the machine and is provided with slides and setting screws for bringing the mechanism clear of the rollers when the machine is in production and for bringing it into operation for grinding. Depending on the condition of the belt the time taken for a complete grinding operation is in the region of 1 5 minutes, whereas on previous machines where the grinding attachment had to be fastened to the machine and then removed again after grinding, the time taken for grinding was in the region of 4 hours.

Claims

1. A textile fabric or paper shrinking machine of the type referred to comprising a front roller mounted in a block moveable in a horizontal direction to and from a driven roller to vary the arc of contact of the belt with the driven roller, the driven roller being mounted on a vertical slide with adjustment to vary the nip between the driven roller and the front roller, the front, rear and driven rollers being mounted in an open sided frame to facilitate the changing of the belt.

2. A textile fabric or paper shrinking machine as in Claim 1 in which the horizontally moving roller is mounted on blocks on a horizontal slide, the length of movement being set by an adjustable stop.

3. A textile fabric or paper shrinking machine as in Claim 1 in which the driven roller is mounted on a bracket carrying a horizontal slide the length of movement being set by an adjustable stop on the slide.

4. A textile fabric or paper shrinking machine substantially as described with reference to the accompanying drawings.

New Claims or Amendments to Claims Filed on 30 October 1979 Superseded Claims All Claims New or Amended Claims:

1. A textile fabric or paper shrinkage machine of the type referred to comprising an open sided frame for ease in changing the endless belt, in which is mounted a front pressurised idling roller mounted in blocks at each side of the machine, each block being carried on a horizontal slide for movement horizontally by a screw, a rear idling roller mounted in blocks at each side of the machine, each block being carried by the horizontal slide, a driven roller mounted in blocks at each side of the frame each block being carried in a vertical slide operated by a ram of an hydraulic cylinder the amount of movement being controlled by micrometer stops to control the pressure of the nip between thefront idling roller and the driven roller, and endless belt passing over the idling rollers and under the driven roller, horizontal movement of the front roller in relation to the pressure roller resulting in a variable arc of contact and at the same time a variation in the angle of the resultant force applied between the pressure roller and the front roller which varies the shrinkage and finish on the fabric or paper.

2. A textile fabric or paper shrinking machine as in Claim 1 in which variable stops are provided to limit the movement of the blocks in the slides.

3. A textile fabric or paper shrinking machine as in Claim 1 in combination with belt grinding mechanism pivoted on the machine for movement into and away from a grinding position.