JP2023507013A - Method for placing a sliver on the spinning device of a spinning unit - Google Patents

Abstract

The present invention is a method for arranging a sliver in a spinning device of a spinning unit, the method comprising: supplying a sliver to a spinning device using a drafting device having a plurality of roller pairs in order to produce a spun yarn from the sliver. Regarding. In order to provide a method for operating a spinning unit that allows easy and efficient placement of the drawn sliver in the spinning device, each roller pair of the closed drafting device is adjusted to a predetermined drawing ratio of the sliver. Correspondingly, operating at an introduction speed below the operating speed of the drafting device, the sliver is then introduced into the nip region of the pair of inlet rollers of the drafting device, and the drawn sliver is then passed through the closed drafting device. It is specified that the material is guided to the spinning device after advancing from the nip region of the pair of exit rollers of the drafting device.

Description

The present invention is a method for placing a sliver on a spinning device of a spinning unit, in which the sliver is fed to the spinning device by means of a drafting device having a plurality of roller pairs for producing a yarn from the sliver. , on the method.

Various configurations of spinning units are known from the prior art, in which the provided sliver is drawn using a drafting device and then spun into a yarn by a spinning device and wound onto a winding package. Arranged alongside one another, a large number of spinning units form a textile machine, in which a large number of threads are simultaneously spun from the sliver provided.

Before starting the spinning process it is necessary to guide the sliver through a drafting device and then place the drawn sliver in a starting position in the spinning device, where the sliver is received by the spinning device, Can be spun into yarn. For placing the sliver on the drafting device in advance, the drafting device is moved, for example, by bringing the top roller of the roller pair, which is arranged on the oscillating support, out of engagement with the bottom roller assigned to the top roller. It is necessary to open up. After opening the drafting device by swiveling the rocking support, it is possible to insert the sliver into the drafting device in a defined manner. A return movement of the oscillating support to the closed position of the drafting device then takes place, in which the drafting device is then started and the sliver is rotated in different rotations of the roller pairs for the stretching ratio to be achieved. It is stretched in a predetermined manner in relation to the number.

Due to the need to open the drafting device for laying down the sliver, the downtime in the individual spinning units is considerably longer, and this long downtime impairs the productivity of the spinning unit. Furthermore, due to the need to open the drafting device, a corresponding mechanical construction is required to ensure a secure opening and closing movement.

Starting from the above, the problem underlying the present invention is to provide a method for operating a spinning unit which allows a simple and efficient placement of the drawn sliver on the spinning device. be.

The present invention solves this problem by a method for placing a sliver on a spinning device of a spinning unit with the features of claim 1 . Advantageous developments of the invention are described in the dependent claims.

The method according to the invention comprises:
operating the roller pairs, in particular the individually driven roller pairs, of the closed drafting device, respectively, at an introduction speed below the operating speed of the drafting device, corresponding to the predetermined stretching ratio of the sliver;
-then introducing the sliver into the nip area of the inlet roller pair of the drafting device,
characterized by then guiding the sliver through the closed drafting device to the spinning device after exiting the nip area of the exit roller pair of the drafting device.

In contrast to the methods known from the prior art, the method according to the invention makes it possible, for example, to avoid opening the drafting device, in which the top roller of a roller pair of the drafting device is lifted from its respective bottom roller. In the method according to the invention, the introduction of the sliver into the drafting device takes place with the drafting device closed. For this purpose, the stationary roller pair of the closed drafting device is first adjusted to an introduction speed which is significantly lower than the operating speed of the roller pair during the normal spinning process. The possibility of rotating the roller pairs each at a low speed synchronously in accordance with the draw ratio to be achieved for the sliver, in particular by means of individual drive technology, then allows the sliver to be manually or automatically drawn into the drawing rollers. It is introduced into a pair of nip regions, after which the sliver is allowed to be guided through the drafting device in a controlled manner. Even at lower introduction speeds, the sliver is drawn in accordance with the draw ratio to be achieved by means of the set rotational speed difference of the roller pairs, and the suitable individual drive of each roller pair, which is important for the drawing, is extremely reliable. It allows synchronization and, as a consequence, the achievement of precisely adjusted draw ratios during sliver feeding in the direction of the spinning device. Furthermore, the roller pairs are preferably arranged independently of each other, particularly preferably by means of assigned individual drives, so that the speed of each roller pair can variably adjust its drive state as required. can be operated individually, so that, for example, adaptation to the draw ratio at any time can be done automatically or manually as required. According to a preferred embodiment, each bottom roller of the roller pair is driven. However, in alternative embodiments, individual drives for the top roller of the roller pair may be provided.

After exiting the drawn sliver from the nip area of the exit roller pair, the sliver is fed to a spinning device where it can undergo a spinning process. The drafting device can then again be operated at its operating speed during the execution of the spinning process, so that the spinning process can be carried out in a defined manner in the spinning unit.

The method according to the invention makes it possible to dispense with long opening times of the drafting device interrupting the spinning process. Furthermore, the spinning process can be started immediately with the sliver emerging from the drafting device, since the sliver emerging from the drafting device already has the necessary draft for the subsequent spinning process. The possibility to operate the drafting device at an introduction speed below the operating speed makes it possible in particular to orient the sliver precisely in the drafting device. The placement in the nip area can be done, for example, by an operator who also monitors the guiding of the sliver through the drafting device and the placement in the spinning device. A low introduction speed enables very precise monitoring of the introduction process into the drafting device and subsequent guidance to the spinning device.

The method according to the invention can basically be used in any spinning unit with a drafting device. For example, it is possible to carry out the method according to the invention on a spinning device with a ring spinning device. According to a particularly preferred embodiment of the invention, however, it is specified that the sliver, after passing through the drafting device, is fed to a spinning device designed as an air spinning device. In the air spinning device of the spinning unit, the free outer fiber ends are helically wound around the core fiber for yarn formation using a stream of compressed air generated via a nozzle device. The free end of the sliver located upstream of the air spinning device is sucked into the air spinning device via the suction air stream.

The advantageous use of the method according to the invention in connection with an air spinning device therefore enables the spinning process to be started almost without delay after passage through the drafting device, which increases the efficiency of the spinning unit. It is excellent in that it can be enhanced supplementarily.

According to another configuration of the method, a suction air flow generator for generating suction air in the region of the air spinning device is activated before or during placement of the sliver on the air spinning device. According to a particularly preferred configuration of the invention, the compressed air source, more preferably also the negative pressure source, usually cooperating with the air spinning device, is used as a suction air flow generator before or after placement of the sliver on the drafting device. , which then applies a suction air flow to the sliver supplied from the drafting device to the air spinning device. This suction air flow is used to introduce the sliver into the air spinning device and/or to remove the loose fiber material from the region of the air spinning device. The suction airflow generator ensures that the loose fiber material does not clog the inlet area or entry area of the air spinning device and the spinning nozzles particularly reliably. This allows a particularly reliable and trouble-free implementation of the air spinning process.

This development of the invention consequently makes it possible to take advantage of the fact that known pneumatic spinning devices usually already have a corresponding suction airflow generator, such a suction airflow generator. is activated within the framework of the method according to a development at a suitable point in time in connection with the process of introducing the sliver into the drafting device, so that any loose fibrous material present is reliably sucked out. be Alternatively or additionally, it is possible to provide a suction air flow generating device separate from the above-described suction air flow generating device in the region of the air spinning device for generating the suction air flow. It is important in this context that fiber residues in the region of the air spinning device can be evacuated and/or the sliver emerging from the drafting device can be adequately supplied to the air spinning device.

According to another configuration of the invention, it is also specified that the air spinning device is opened before or during placement of the sliver on the air spinning device. Known air spinning devices usually have at least two members. The first part of the air spinning device is a nozzle device with a nozzle connected via a conduit to a source of compressed air, the air emerging from the nozzle creating a rotating flow that acts on the drawn sliver. work for A second member of the air spinning device has a yarn-forming element, for example a hollow conical spinning element, which cooperates with the nozzle device to form the yarn and to is withdrawn from the spinning device through a hollow conical spinning element. The opening of the air spinning device is associated with a preferably carried out actuation of the suction air flow generating device so that, for example, loose fiber material does not collect in the region of the spinning nozzle and interfere with the spinning process and the loose fiber material is discharged through the suction airflow generator. This configuration of the invention additionally ensures that the spinning process can be started and carried out without hindrance after placement of the stretched sliver.

According to another embodiment of the invention, it is also specified that the drafting device is stopped after the transfer of the sliver to the air spinning device, the air spinning device is closed and the suction air flow generating device is stopped. Interruption of the feeding process can be done manually by an operator or automatically. For this purpose, for example, a sliver length or a time interval can be determined, and the drafting device is automatically stopped after this sliver length has been obtained or after the time interval has elapsed.

This configuration of the invention specifies that after placing the sliver in the inlet area of the air spinning device, the introduction process is stopped via the drafting device. After this, it is possible to remove the contamination by the loose fibrous material after a suction which is advantageously followed and possibly associated with the likewise opening of the air spinning device, after which this is followed by air The spinning device can be moved into the required position for the spinning process. After that, the spinning process can then be started. In this case, obstacles are avoided particularly effectively.

One embodiment of the present invention will now be described with reference to the drawings.

5 is a flow chart showing a method for placing a sliver on a spinning device of a spinning unit; 1 is a diagram schematically showing an air spinning device and a drafting device arranged upstream of the air spinning device; FIG. FIG. 3 is a diagram schematically showing an open state of the pneumatic spinning device shown in FIG. 2;

FIG. 1 shows, with reference to FIGS. 2 and 3, the process sequence for placing a sliver 3 via a drafting device 1 in an air spinning device 2 of a spinning unit (not shown here), FIG. and in FIG. 3 the arrangement of the drafting device 1 and the air spinning device 2 of the spinning unit is shown schematically in two positions.

In order to present the drawn sliver 3 at the inlet of the air spinning device 2, the individually drivable roller pairs 5, 5a, 6, 6a, 7, 7a, 8, 8a of the drafting device 1 are closed, It is operated at an introduction speed that is significantly lower than the operating speed of the draft device 1 . At the same time, the compressed air source 13, which is connected to the spinning nozzle unit 10 via a line 12, is activated to generate suction air in the region of the inlet of the air spinning device 2, which is shown in FIG. 2 from its closed position shown in FIG. 2 into its open position shown in FIG. 3, in which the unit 15 with conical spinning elements is in the operating position shown in FIG. It is moved in a direction away from the nozzle device 4 in comparison.

In the open state of the air spinning device 2, the individually drivable roller pairs 5, 5a, 6, 6a, 7, 7a, 8, 8a of the drafting device 1 are actuated to provide compressed air via the compressed air source 13. After that, the sliver 3 is manually introduced into the nip area of the inlet rollers 5, 5a by the operator. From this nipping area of the inlet rollers 5, 5a the sliver 3 is transported to the outlet roller pair 8, 8a after passing the drafting device rollers 6, 6a, 7, 7a at a greatly reduced speed compared to normal operation of the spinning unit. The stretched sliver 3 advances from the draft device 1 at the exit roller pair 8, 8a. The introduction speeds of the drafting device rollers 5, 5a, 6, 6a, 7, 7a, 8, 8a are determined according to the stretch to be achieved of the sliver 3, so that the sliver 3 is stretched to the set stretch. Proceed from the drafting device 1 according to the ratio. The actuated compressed air is supplied to the air spinning device 2 by directing the nozzles 10, 11 assigned to the spinning nozzle unit 9 away from the inlet of the air spinning device 2 or towards the conical spinning elements 16. A suction air flow is generated in the region of the inlet of 2, by means of which the sliver 3 emerging from the drafting device 1 can be reliably fed to the air spinning device 2. The intake air flow can preferably be supported by the optional connection of a negative pressure source 19 . The connection of the underpressure source 19 facilitates the evacuation of fiber residues from the pneumatic spinning device 2, in particular from the region of the conical spinning elements 16. FIG. Via the outlet roller pair 8, 8a, the stretched sliver 3 is optionally guided into the inlet of the air spinning device 2 by the acting suction air current. After obtaining the correct position of the free end 24 of the sliver 3 inside the air spinning device 2, the drafting device 1 is switched off and the compressed air source 13 is connected to the negative pressure source 19 if connected. is also stopped. The air spinning device 2 is then moved from the open position shown in FIG. 3 to the operating position shown in FIG.

By activating the compressed air source 13 and the selectively connected negative pressure source 19 while the free end 24 of the sliver 3 is arranged in the region of the air spinning device 2, the loose fiber material is in particular air-spun. It is ensured that the area of the spinning device 2 is reliably drained, thereby preventing disturbances during operation of the air spinning device 2 . After closing the air spinning device 2, the spinning process can be started with continued sliver supply and spinning pressure via the spinning nozzle unit 9 and the nozzles 10, 11 assigned to this spinning nozzle unit 10. can.

1 draft device 2 pneumatic spinning device 3 sliver 4 nozzle device 5, 5a inlet roller 6, 6a draft device roller 7, 7a draft device roller 8, 8a outlet roller 9 spinning nozzle unit 10 nozzle 11 nozzle 12 pipe line 13 compressed air source 15 Unit with conical spinning element 16 conical spinning element 17 swirl chamber 18 conduit 19 underpressure source 24 free end of sliver

Claims (5)

A method for placing a sliver on a spinning device of a spinning unit, comprising a plurality of roller pairs (5, 5a, 6, 6a, 7, 7a, 8; A method for feeding said sliver (3) to said spinning device (2) using a drafting device (1) having 8a),
a predetermined stretching of the sliver (3), in particular of the individually drivable roller pairs (5, 5a, 6, 6a, 7, 7a, 8, 8a) of the closed drafting device (1), respectively; proportionately operating at an introduction speed below the operating speed of said drafting device (1);
- then introducing said sliver (3) into the nip area of the inlet roller pair (5, 5a) of said drafting device (1),
- the drawn sliver (3) is then passed through the closed drafting device (1) and out of the nip area of the exit roller pair (8, 8a) of the drafting device (1) before said spinning A method, characterized in that it guides to a device (7). 2. A method according to claim 1, characterized in that the sliver (3), after passing through the drafting device (1), is fed to a spinning device configured as an air spinning device (2). 3. The method according to claim 1 or 2, characterized in that the suction airflow generating device of said air spinning device (2) is operated before or during placement of said sliver (3) on said air spinning device (2). the method of. 4. Any one of claims 1 to 3, characterized in that the air spinning device (2) is opened before or during placement of the sliver (3) on the air spinning device (2) or Multiple-item method. The drafting device (1) is stopped after the sliver (3) is transferred to the air spinning device (2), the air spinning device (2) is closed, and the suction air flow generating device is stopped. 5. A method according to claim 4, characterized in that.

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