GB2106552A

GB2106552A - Sliver forming guide

Info

Publication number: GB2106552A
Application number: GB08221511A
Authority: GB
Inventors: Manfred Schneider; Gerhard Baar; Gerhard Barth
Original assignee: Kombinat Textima VEB
Current assignee: Kombinat Textima VEB
Priority date: 1981-09-02
Filing date: 1982-07-26
Publication date: 1983-04-13
Also published as: DE3220636A1; CH656153A5; RO86140B1; FR2512077A1; SU1440970A1; DD161271A3; RO86140A2; GB2106552B

Abstract

A sliver guide comprises a fibre guide element (9) which is closed on at least three sides, and is disposed, in the operating position, above the line of connection between the take down roller gap (17) and the supply roller gap (18) and by means of which the fibre fleece is guided approximately perpendicularly upwards from the take down roller gap. This locates the fleece very close to the output side of the take down rollers and maintains the edge zones of the fleece on the fibre assembly in a reliable manner. Obstructions move the guide and switch off the machine. <IMAGE>

Description

SPECIFICATION Device for forming a sliver of teasels The invention may be used with teasels or cards with which a fibre fleece released from the covering of the doffer is combined to form a sliver.

It is known from the West German Offenlegungsschrift 2741095 to dispose, downstream of the take down rollers, baffle plates which have perforations in their central area for the sliver.

In this way the fibre fleece is compressed directly after leaving the take down rollers and the edge zones of the fleece do not tear, even in the case of high take down speeds. In this respect the fleece runs substantially horizontally against approximately perpendicular, partly arcuate, baffle plates. This is disadvantageous. If tearing of the fleece does occur, obstructions may be caused.

Operation is complicated and the friction of the edge zones of the fleece on the baffle plates leads to defects in the quality of the sliver.

In order that obstructions, at least, can be removed quickly, the baffle plates and hopper are embodied so that they may be displaced away from the take down rolers. This leads to a considerable increase in manufacturing costs.

Furthermore, friction of the edge zones of the fleece and, therefore, qualitity defects in the sliver, are still produced.

Another known device (West German Offenlegungsschrift 2839414) deflects the fibre fleece in the first instance to a perpendicular guideway before it reaches the baffle plate, the fleece being deflected by approximately 900 on this plate and guided to the hopper. A portion of the fleece having a very loose formation therefore hangs over the baffle plate in space. This leads to partial fleece tears which, although removed automatically in the baffle plate, still leave behind clear slub areas in the sliver.

Further devices, which support the formation of the sliver by means of conveyor belts, are very costly and subject to breakdowns.

An object of the invention is to provide a device which ensures, on one hand, a high sliver quality, even in the case of high take down speeds, and which enables simple operation for very low manufacturing costs.

The aim of the invention is to locate blocked zones of the fleece very close to the output station of the take down rollers and also to maintain the edge areas of the fleece in a reliable manner on the fibre assembly. In this respect the location of the sliver is simple and obstructions can be made to cause an immediate stoppage of the machine.

In accordance with the invention, this aim is achieved in that the sliver guide has a hoppershaped fibre guide element having at least three closed sides which is disposed, in the operating condition, above the line of connection between the take down roller gap and the supply roller gap and by means of which the fibre fleece is guided almost perpendicularly upwards from the take down roller gap.

The device is preferably disposed between the take down rollers and the hopper of a calender roller pair.

In accordance with the invention, the very loose edges of the fleece may be supported on the central portions of the fleece which have already been compressed jointly as a result of their gravitational force and as result of the air resistance acting in the same direction, and may therefore avoid non-uniform formation of the sliver or even, in unfavourable cases, the tearing of the fleece. The fibres of the edge zones are maintained in the fibre assembly even in the case of high operating speeds. In the case of lower belt speeds, location may be carried out using the method hitherto known.

The simplicity of the technical means and the exploitation of the technical machine design which has been customary hitherto enables the subsequent fitting of older carding machines with the device of the invention.

In a preferred embodiment of the invention, the fibre guide element is pivotable from a lower control position in the direct vicinity of the sliver hopper into an operating position which is approximately perpendicularly above the take down roller gap of the take down rollers, and may be locked in the operating and control position.

In accordance with a further feature of the invention, the fibre guide element is disposed in the middle of the upper edge of a synchlinal fibre guide plate, the latter being pivotable about an axis which is orientated parallel to the take down roller gap and is disposed in the vicinity of the latter. In practice, the fibre guide plate may be pivotable about the axis of the lower take down roller.

A final feature of the invention lies in that the fibre guide plate is disposed in its operating position adjacent to an end switch for switching the machine on and off.

The invention is exemplified with reference to an embodiment thereof now described with reference to the accompanying drawings, in which: Figure 1 is a side view of the fleece removal of a flat card, Figure 2 is a simplified front view of a sliver guide.

Figure 1 is a partial representation of the drum 1 and the flat warp 2 of a flat card. A take down roller pair 4 is disposed downstream of the doffer 3 in the direction of flow of the fleece, the roller pair comprising a lower take down roller 5 and an upper take down roller 6. A sliver guide 8 is pivotably mounted about the axis 7 of the lower take down roller 5. The sliver guide 8 comprises a fibre guide element 9 which is shaped like an upwardly open hopper and is fastened in the centre of the upper edge of a fibre guide plate 10 (see Figure 2). A conventional hopper may alternatively be used in place of the fibre guide element 9 shown. Again, in the simplest case, the fibre guide plate 10 could be replaced by a wire bow which supports the fibre guide element 9.

The illustrated fibre guide plate 10 is troughshaped and ribs 11 are machined on its front surface.

The sliver guide 8 (guide plate 10) may be pivoted from an operating position 1 2 into a central position 13, and vice versa. The fibre guide plate 10 may be locked in both positions.

Locking takes place by means of a drop-in pin 14 loaded by a compression spring, which pin is fastened on the frame side of the machine. The fibre guide plate 10 may be pivoted by means of a hand lever 1 5. in the operating position 12, the fibre guide plate 10 presses at its end against a switch 1 6 which leads to the main drive of the flat card via an electric control circuit which is not shown.

In the operating position 1 2 of the sliver guide 8, the fibre guide element 9 is disposed above the line of connection between the take down roller gap 1 7 and the supply roller gap 18, almost perpendicularly above the take down roller gap 17, and therefore with a small spacing with respect to the front limit plane 1 9 tangential to the take down rollers 5, 6. In the control position 13, the aperture of the fibre guide element 9 is disposed at the height of the abovementioned connection line in front of the sliver hopper 20. In the direction of operation, the sliver hopper 20 is followed by the supply roller pair 21 and 22 or calender rolls. During operation of the flat card, the fibre fleece 23 is supplied from the drum 1 to the doffer 3 from which it is released through the take down roller pair 4.In normal operation of the flat card, the sliver guide 8 is disposed in the operating position 12, as a result of which the fibre fleece 23 is guided upwardly from the take down roller pair 4 to the fibre guide element 9, in a direction approximately normal to the take down roller gap 17. In the fibre guide element 9, the fibre fleece 23 is converted into the sliver 24.

This sliver 24 is supplied via the sliver hopper 20 to the supply roller pairs 21, 22. As the sliver formation is substantially terminated after the fibre guide element 9, the sliver hopper 20 may be omitted.

In the case of malfunctions arising during the formation of the sliver, for example tearing of the sliver, the fibre is locked in the area of the fibre guide plate 10, as a result of which the latter is pivoted out of the area of the end switch 16, which thus leads to switching off of the machine.

If the sliver is to be applied again during creep operation of the flat card, the sliver guide 8 is pivoted into the control position 13, as a result of which sufficient space is provided for the operators.

Claims

1. A device for forming a sliver on teasels, including a take down roller pair having an approximately horizontal delivery gap, a supply roller pair and a sliver guide disposed between the take down roller pair and the supply roller pair, wherein the sliver guide has a fibre guide element which is hopper-shaped and closed on at least three sides, which element is disposed, in the operating condition, above the line of connection between the take down roller gap and the supply roller gap and by means of which the fibre fleece is guided approximately upwards from the take down roller gap.

2. A device as claimed in claim 1, wherein the fibre guide element is movable from a lower control position in the direct vicinity of a sliver hopper into an operating position approximately above the take down roller gap of the take down rollers, and may be locked in the operating and control positions.

3. A device as claimed in claim 2, wherein the fibre guide element is disposed in the centre of the upper edge of a trough-shaped fibre guide plate, the fibre guide plate being pivotable about an axis which is orientated parallel to the take down roller gap and is disposed in the vicinity of the latter.

4. A device as claimed in claim 3, wherein the fibre guide plate is pivotable about the axis of the lower take down roller.

5. A device as claimed in claim 4, wherein the fibre guide plate cooperates with a switch for switching off the machine when said plate is moved out of its operating position.

6. A device for forming a sliver on teasels, substantially as hereinbefore described with reference to the accompanying drawings.