METHOD FOR ARRANGING A FIBRE STRAND ON A SPINNING DEVICE OF A SPINNING STATION

Abstract

A method for arranging a fibre strand on a spinning device of a spinning station, wherein the spinning device is fed the fibre strand in order to produce a spun thread from the fibre strand by means of a drafting unit having a plurality of roller pairs. The roller pairs of the closed drafting unit are each operated, in a manner corresponding to the predefined drafting ratio of the fibre strand, with an introduction speed lower than the operating speed of the drafting unit, the fibre strand is subsequently introduced into the clamping region of an input roller pair of the drafting unit and the drafted fibre strand, after passing through the closed drafting unit and exiting a clamping region of an output roller part of the drafting unit, is subsequently fed to the spinning device.

Claims

1. A method for arranging a fibre strand at a spinning device of a spinning station, wherein the fibre strand is fed, by a drafting system having several roller pairs, to the spinning device for the manufacture of a spun thread from the fibre strand, characterised in that the roller pairs of the closed drafting system, are each operated, in accordance with the predefined draft ratio of the fibre strand, at an insertion speed which is lower than the operating speed of the drafting system, the fibre strand is then inserted into the clamping area of an input roller pair of the drafting system and the drafted fibre strand is then fed to the spinning device after passing through the closed drafting system and exiting a clamping area of an output roller pair of the drafting system.

2. The method according to claim 1, characterised in that the fibre strand, after passing through the drafting system, is fed to a spinning device designed as an air-jet spinning device.

3. The method according to claim 1, characterised in that a suction air flow generating device of the air-jet spinning device is activated before or during the arrangement of the fibre strand at the air-jet spinning device.

4. The method according to claim 1, characterised in that the air-jet spinning device is opened before or during the arrangement of the fibre strand at the air-jet spinning device.

5. The method according to claim 4, characterised in that, after the fibre strand has been transferred to the air-jet spinning device, the drafting system is stopped, the air-jet spinning device is closed and the suction air flow generating device is deactivated.

6. The method according to claim 1, wherein the roller pairs are individually drivable.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] An embodiment example of the present invention is explained below with reference to the drawings.

[0021] In the drawings:

[0022] FIG. 1 shows a flowchart of a method for arranging a fibre strand at a spinning device of a spinning station;

[0023] FIG. 2 shows a schematic representation of an air-jet spinning device with an upstream drafting system and

[0024] FIG. 3 shows a schematic representation of the air-jet spinning device in FIG. 2 in the open state.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] FIG. 1 shows a method sequence for arranging a fibre strand 3 via a drafting system 1 at an air-jet spinning device 2 of a spinning station (not shown here), with reference to FIGS. 2 and 3, in which the arrangement of the drafting system 1 and the air-jet spinning device 2 of the spinning station is shown schematically in two positions.

[0026] To provide a drafted fibre strand 3 at an inlet of the air-jet spinning device 2, the individually drivable roller pairs 5, 5a, 6, 6a, 7, 7a, 8, 8a of the drafting system 1 are operated in the closed state at an insertion speed which is significantly below the operating speed of the drafting system 1. At the same time, a compressed air source 13 connected to a spinning nozzle unit 10 via a line 12 is activated to generate a suction air flow in the area of the inlet of air-jet spinning device 2, and the air-jet spinning device 2 is moved from its closed position shown in FIG. 2 to its open position shown in FIG. 3, in which a spinning cone unit 15 is displaced relative to a nozzle device 4 in comparison with the operating position shown in FIG. 2.

[0027] After the activation of the individually drivable roller pairs 5, 5a, 6, 6a, 7, 7a, 8, 8a of the drafting system 1 and the provision of compressed air by means of the compressed air source 13 in the open state of the air-jet spinning device 2, the fibre strand 3 is inserted manually by the operating personnel into the clamping area of the input rollers 5, 5a. From there, after passing through the drafting system rollers 6, 6a, 7, 7a, the fibre strand 3 is transferred, at a considerably reduced speed in comparison with the regular operation of the spinning station, to the output rollers 8, 8a, at which the drafted fibre strand 3 emerges from the drafting system 1. The insertion speed of the drafting system rollers 5, 5a, 6, 6a, 7, 7a, 8, 8a is defined according to the drafting of the fibre strand 3 to be achieved, so that the fibre strand 3 emerges from the drafting system 1 in accordance with the specified draft ratio. Because of the alignment of the nozzles 10, 11 assigned to the spinning nozzle unit 9 in a direction leading away from the inlet of the air-jet spinning device 2 or in a direction leading toward the spinning cone 16, the activated compressed air generates a suction air flow in the area of the inlet of the air-jet spinning device 2, by means of which suction air flow the fibre strand 3 emerging from the drafting system 1 can be reliably fed to the air-jet spinning device 2. The suction air flow can preferably be supported by switching on the vacuum source 19 as required. Switching on the vacuum source 19 also promotes the removal of fibre remains from the area of the air-jet spinning device 2, in particular from the area of the spinning cone 16. Via the output roller pair 8, 8a, the drafted fibre strand 3 is guided as required into the inlet of the air-jet spinning device 2 by means of the suction air flow that is present. After a defined position of the free end 24 of the fibre strand 3 within the air-jet spinning device 2 has been achieved, the drafting system 1 is stopped and the compressed air source 13 and, if switched on, also the vacuum source 19 are deactivated. Then the air-jet spinning device 2 is moved from its open position shown in FIG. 3 to the operating position shown in FIG. 2.

[0028] The compressed air source 13 activated during the arrangement of the free end 24 of the fibre strand 3 in the area of the air-jet spinning device 2 and optionally the switched-on vacuum source 19 ensure, among other things, that loose fibre materials are reliably removed from the area of the air-jet spinning device 2 and thus cannot lead to malfunctions in the operation of the air-jet spinning device 2. After the air-jet spinning device 2 has been closed, the spinning process can be started by continuing the fibre strand feed and applying a spinning pressure by means of the spinning nozzle unit 9 and its associated nozzles 10, 11.

LIST OF REFERENCE SIGNS

[0029] 1 Drafting system [0030] 2 Air-jet spinning device [0031] 3 Fibre strand [0032] 4 Nozzle device [0033] 5, 5a Input rollers [0034] 6, 6a Drafting system rollers [0035] 7, 7a Drafting system rollers [0036] 8, 8a Output rollers [0037] 9 Spinning nozzle unit [0038] 10 Nozzles [0039] 11 Nozzles [0040] 12 Line [0041] 13 Compressed air source [0042] 15 Spinning cone unit [0043] 16 Spinning cone [0044] 17 Vortex chamber [0045] 18 Line [0046] 19 Vacuum source [0047] 24 Free end of the fibre strand