EP4303349A1 - Method for operating a spinning station of a spinning machine and spinning machine - Google Patents

Abstract

In a method for operating a spinning station (2) of a spinning machine (1), in which a fiber material (5) is dissolved into individual fibers (6) by means of a dissolving device (4) and the individual fibers (6) are formed into one by means of a spinning device (7). Yarn (8) are spun, the opening device (4) containing an opening roller (15) which is rotatably mounted in an opening housing (13) and can be driven by means of an individual drive (14), the spinning device (7) having a vacuum channel (17) of the spinning machine (1) is connected and is subjected to negative pressure and the opening housing (13) is connected to the spinning device (7) via a feed channel (18), while the spinning station (2) is at a standstill, the opening roller (15) is moved by means of its individual drive ( 14) is driven briefly at least once and stopped again. Alternatively, while the spinning station (2) is at a standstill, the opening roller (15) is driven at a minimum speed by means of its individual drive (14). A corresponding spinning machine (1) with a large number of spinning stations (2) arranged next to one another has a control unit (9) for carrying out the procedure.

Description

The present invention relates to a method for operating a spinning unit of a spinning machine, in which a fiber material is dissolved into individual fibers by means of an opening device and the individual fibers are spun into a yarn using a spinning device, the opening device being rotatably mounted in an opening housing and drivable by means of an individual drive Opening roller includes, wherein the spinning device is connected to a vacuum channel of the spinning machine and is subjected to negative pressure and wherein the opening housing is connected to the spinning device via a feed channel.

Opening rollers are known in various designs in the prior art and serve to break up a fiber material presented to the spinning device in the form of a coherent sliver into loose individual fibers. During open-end spinning, only individual fibers can be processed and placed on an open end of the yarn. For this purpose, the rotatably driven opening rollers are provided with a set that combs out the individual fibers from the sliver and forwards them to a feed channel, from where the individual fibers are fed to the spinning device.

For various reasons, fiber accumulations can occur on the opening roller, which become stuck in various places between the rotating opening roller and the walls of the opening roller housing surrounding the opening roller. This can slow down the movement of the opening roller and lead to a complete blocking of the opening roller.

In the DE 34 17 567 A1 It is described that individual fibers, in particular due to the helical arrangement of the clothing, can extend beyond the end face of the opening roller and can get jammed in the area between the end face of the opening roller and the housing wall opposite the end face. To avoid these problems, the DE 34 17 567 A1 proposes to introduce an additional air stream into the opening roller housing, which blows the fibers back into the area of the clothing.

In the DE 33 41 279 A1 A suction effect between the end faces of the opening roller and the housing wall is also described. To solve the problem, it is proposed to provide a scraper collecting groove on the wall of the opening housing opposite the end face of the opening roller.

Likewise, in the DE 23 29 223 A1 described that despite the side covers of the opening roller protruding over the clothing, an air flow occurs through the opening roller housing. This is caused by a pressure gradient between the fiber feed side and the fiber discharge side connected to the fiber feed channel. Here too, fiber accumulations should be avoided through a certain geometric shape.

What the aforementioned documents have in common is that the opening roller is driven there together with the other opening rollers by a central drive via a machine-long tangential belt. Such spinning machines usually have a maintenance device that can be moved along the workstations and is often also used to clean the workstations. In today's spinning machines, however, individually driven opening rollers are mainly used, each of which has its own drive motor.

From the DE 10 2006 033 971 A1 Such a dissolving device is known. The document deals with fiber deposits, which arise in particular due to adhering contaminants such as dust, nits or honeydew in the area of the fiber sliver feed. To remove the fiber deposits, a blow nozzle device should be installed in the peripheral surface of the opening roller housing surrounding the opening roller in the area of a housing gusset arranged between the opening roller and the feed cylinder. With the help of the air flow activated in this way, the dirt particles adhering there are loosened. Nevertheless, with such individually driven opening rollers, fiber accumulation can occur, especially in the area of the clothing, and as a result the opening roller can become blocked.

The object of the present invention is to propose a method for operating a spinning station of a spinning machine and a corresponding spinning machine, which avoids fiber accumulations and blockages on an individually driven opening roller.

The task is solved by a method and a spinning machine with the features of the independent patent claims.

In a method for operating a spinning unit of a spinning machine, in which a fiber material is dissolved into individual fibers by means of an opening device and the individual fibers are spun into a yarn using a spinning device, the opening device contains an opening roller which is rotatably mounted in an opening housing and can be driven by means of an individual drive. The spinning device is connected to a vacuum channel of the spinning machine and is subjected to negative pressure. The opening housing is connected to the spinning device via a feed channel.

The method proposes that when the spinning station is at a standstill, the opening roller is activated at least once by means of its individual drive is driven briefly and then stopped again. In an alternative embodiment of the method, it is proposed that while the spinning station is at a standstill, the opening roller is driven at a minimum speed by means of its individual drive. The minimum speed is a reduced speed compared to the operating speed of the opening roller, with which the opening roller can just be kept rotating. The present invention has discovered that fibers that are particularly stuck to the clothing of the opening roller can be loosened by setting an individually driven opening roller in motion just once. This is also possible if the opening roller is operated at a minimum speed that is greatly reduced compared to its operating speed while the spinning station is at a standstill. With individually driven opening rollers, large accumulations of fibers can occur in the area of the clothing, especially if a spinning station is at a standstill for a long time, since fiber-containing air is constantly sucked in through the supply air openings of the opening housing, even when the opening roller is stationary. The fibers contained in the air are retained by the set of the standing opening roller and collect there. These fibers can lead to braking and even blocking of the opening roller and prevent the spinning unit from restarting smoothly.

By moving the opening roller, it is now possible to prevent fibers from getting stuck on the opening roller clothing. Fibers adhering to the opening roller can also be loosened before the fiber accumulations lead to jamming. For example, fibers in the area of the dirt separation opening can be detached from the opening roller by the effect of gravity and possibly acting centrifugal forces and removed via the dirt separation opening. Furthermore, the fibers can be loosened by exposing the fibers to a suction flow in the area of the feed channel, which connects the opening housing to the spinning device, whereby the fibers are also loosened become. This effectively prevents the opening roller from braking or blocking.

The same advantages can also be achieved with a spinning machine with a large number of spinning stations arranged next to one another, each of which has a dissolving device for dissolving a fiber material into individual fibers and a spinning device for spinning the individual fibers into a yarn. The opening device has an opening roller which is rotatably mounted in an opening housing and can be driven by means of an individual drive, the spinning device being connected to a vacuum channel of the spinning machine and can be subjected to negative pressure and the opening housing being connected to the spinning device via a feed channel. The spinning machine has a control unit for carrying out the method according to one of the preceding claims. The control unit can be a control unit of the spinning station or a central control unit of the spinning machine. The method can also be carried out in cooperation between two or more control units. It is particularly advantageous that no additional design measures are required, so that the spinning machine can be designed cost-effectively.

It is advantageous if the opening roller is driven against its regular direction of rotation while the spinning station is at a standstill. Accidents due to the opening roller rotating when the spinning station is stationary can be avoided in this way.

It is particularly advantageous if the opening roller is driven briefly and stopped again several times at predetermined time intervals. This is particularly advantageous when the spinning station is stopped for a longer period of time in order to avoid large accumulations of fibers.

It is also advantageous if the time intervals are set in a control unit of the spinning station and/or the spinning machine. In the case of the spinning machine, it is correspondingly advantageous if the opening roller can be driven at predetermined time intervals, the time intervals being adjustable in a control unit of the spinning station and/or the spinning machine. The spinning station can thereby dissolve or prevent any fiber accumulations that may build up independently without operating personnel and without a movable maintenance device.

It is particularly advantageous if the time intervals are set in an application-specific manner depending on the fiber material used or, in the case of the spinning machine, can be stored in an application-specific manner depending on the fiber material used in the control unit and/or in a system control system with an article management system. In this way, for example, in the case of fiber materials contaminated with impurities or coarser fiber materials, more frequent driving can be provided in order to do justice to the greater tendency for fiber adhesion.

It is also advantageous if the opening roller is additionally cleaned by means of a blown air stream, in particular a blown air stream from a blowing nozzle belonging to the spinning unit. In the spinning machine, the spinning units each have their own blowing nozzle for cleaning the opening roller. By means of such a blowing nozzle, the loosening and/or removal of fibers that have already been loosened from the clothing can be supported.

It is advantageous if the blowing nozzle opens in the area of the dirt separation opening in order to support the removal of the loosened fibers.

Figur 1

eine Spinnmaschine in einer schematischen Vorderansicht als Übersichtsdarstellung,

Figur 2

eine Spinnstelle einer Spinnmaschine in einer schematischen, teilweise geschnittenen Seitenansicht,

Figur 3

eine schematische, teilweise geschnittene Vorderansicht einer Spinnstelle mit einer Auflöseeinrichtung nach einer ersten Ausführung, sowie

Figur 4

eine schematische, teilweise geschnittene Vorderansicht einer Spinnstelle mit einer Auflöseeinrichtung nach einer zweiten Ausführung.

Further advantages of the invention are described in the following exemplary embodiments. Show it schematically:

Figure 1

a spinning machine in a schematic front view as an overview representation,

Figure 2

a spinning position of a spinning machine in a schematic, partially sectioned side view,

Figure 3

a schematic, partially sectioned front view of a spinning station with an opening device according to a first embodiment, and

Figure 4

a schematic, partially sectioned front view of a spinning station with an opening device according to a second embodiment.

In the following description of the figures, the same reference numbers are used for identical and/or at least comparable features in the various figures. The individual features, their design and/or mode of operation are usually only explained in detail when they are first mentioned. If individual features are not explained again in detail, their design and/or mode of operation corresponds to the design and mode of operation of the features with the same effect or the same name that have already been described. Furthermore, for reasons of clarity, often only one or just a few of several identical components or features are labeled.

Figure 1 shows a spinning machine 1 in a schematic front view as an overview. The spinning machine 1 has, in a manner known per se, a plurality of spinning stations 2 arranged next to one another, each of which is arranged between two frames 3 of the spinning machine 1. For reasons of clarity, only two spinning stations 2 are designated here and their individual components are labeled. Each of the spinning stations 2 has a dissolving device 4 for dissolving something fed to it Fiber material 5 into individual fibers 6 (see Fig. 2 ) on. The individual fibers 6 are fed to a spinning device 7, in which they are spun into a yarn 8. The spun yarn 8 is then withdrawn from the spinning device 7 and fed to a winding device 10, where it is wound onto a spool 11.

To control the functions of the spinning machine 1 and/or the spinning stations 2, the spinning machine 1 has a central control unit 9. Likewise, according to the present illustration, the spinning stations 2 each have their own spinning station control unit 9, which is connected to the central control unit of the spinning machine 1, as symbolized by the dotted lines.

Optionally, the spinning machine 1 can also have a maintenance device 22 that can be moved along the spinning stations 2. This also has a control unit 9, which is connected to the central control unit 9 of the spinning machine 1, as also indicated by a dotted line.

In modern spinning machines 1, whose spinning stations 2 are designed as so-called self-sufficient spinning stations 2, which can carry out a spinning process independently even after a thread break, such maintenance devices 22 are only required to carry out a bobbin change. Most other maintenance activities such as finding a thread end that has wound onto the bobbin, cleaning the spinning element, preparing the yarn ends and the actual spinning can be carried out by the spinning stations 2 themselves, which have individually drivable handling organs for this purpose. The present invention can preferably be used on rotor spinning machines 1 with such self-sufficient spinning stations 2, but can be used on any spinning machine 1 with an individually driven opening roller 15 (see. Fig. 2 ) are used.

Figure 2 shows a spinning station of a spinning machine 1 in a schematic, partially sectioned side view. The spinning machine 1 is designed here as a rotor spinning machine. As already mentioned Fig. 1 described, a fiber material 5 is fed to the spinning station 2. For this purpose, the spinning station 2 has a feed roller 16, which feeds the fiber material 5 to the opening roller 15 of the opening device 4, which is rotatably arranged in an opening housing 13. For this purpose, the opening roller 15 is driven by an individual drive 14. The fiber material 5 is dissolved by the opening roller 15 into individual fibers 6, which are then fed to the spinning device 7 via a feed channel 18. The feed channel 18 connects the opening housing 13 with the spinning device 7. The spinning device 7 contains a spinning rotor 12 arranged in a vacuum-pressurized housing (not designated). The spinning device 7, more precisely, the housing, is connected to a vacuum channel 17 for this purpose.

In the process, while the spinning station 2 is at a standstill, the opening roller is briefly driven and stopped again at least once, preferably several times, by means of its individual drive 14. For this purpose, the individual drive 14 of the opening roller 15 is connected to the control unit 9 of the spinning unit 2 for tax purposes. The control unit 9 can control the multiple driving of the opening roller 15 at predetermined time intervals. For this purpose, the time intervals can be set, for example depending on an application on the spinning station 2, in the control unit 9 of the spinning station 2 or also in the central control unit 9 of the spinning machine 1. As an alternative to driving the opening roller 15 multiple times, permanent driving at a speed that is reduced compared to the operating speed of the opening roller can also be provided while the spinning station is at a standstill. In this way, larger fiber accumulations, which can subsequently lead to blockages in the opening roller, can be avoided and the smooth restart of the spinning station 2 can be ensured. This is explained below using the Figures 3 and 4 explained in more detail.

Figure 3 shows a schematic, partially sectioned front view of a spinning station with an opening device 4 according to a first embodiment. The feeding of the fiber material 5 by means of the feed roller 16 is shown. The fiber material 5 is dissolved into the individual fibers 6 by means of a set 20 of the opening roller 15. Likewise, the individual fibers 6 are delivered to the feed channel 18 by means of the clothing 20, from where they reach the spinning device 7 through the effect of the negative pressure prevailing in the spinning device 7. The spinning device 7 is in the present case designed as a rotor spinning device and contains a spinning rotor 12 as a spinning element.

During operation of the spinning station 2, fiber material 5 is continuously fed to the opening device 4 and the yarn 8 spun from it is produced from the spinning device 7 (see Fig. Fig. 1 and 2 ) continuously deducted. In the case of spinning machines 1, however, it often happens that individual spinning positions 2 stand still for a longer period of time. This is the case, for example, if there is a malfunction or defect in the spinning station 2 or if the spinning station 2 in question has already reached its production target and a new product has not yet been started. However, due to the negative pressure present in the spinning device 7, even when the workstation 2 is at a standstill, air is sucked from the supply air openings, in particular the dirt separation opening 23, of the opening housing 13 through the opening housing 13 via the clothing 20 of the opening roller 15 into the spinning device 7. The fibers contained in the air remain attached to the clothing 20 of the stationary opening roller 15, which can lead to increasingly larger accumulations of fibers over time.

If the opening roller 15 is driven briefly at least once, but preferably several times, while the spinning station 2 is at a standstill, the formation of fiber accumulations can be effectively avoided. The short-term driving can prevent individual fibers 6 from getting stuck on the clothing 20 and individual fibers 6 that are already adhering be detached from the set 20 again. The individual fibers are preferably detached from the clothing 20 by the effect of gravity in the area of the dirt separation opening 23 and can be removed via the dirt separation opening 23. Likewise, individual fibers 6 in the area of the feed channel 18 can be exposed to the effect of the negative pressure present there, whereby they are detached from the clothing and can be discharged via the feed channel 18.

Figure 4 shows a schematic, partially sectioned front view of a spinning station 2 with an opening device 4 according to a second embodiment. In contrast to the execution of the Figure 3 A blowing nozzle 19 belonging to the spinning station is arranged at the spinning station 2 shown here for cleaning the opening roller 15. The blowing nozzle 19 is connected to a compressed air supply, not shown here, and can be actuated by means of a valve 21. By means of the blowing nozzle 19, the loosening of adhering individual fibers 6 from the clothing 20 can be supported. For this purpose, the blowing nozzle 19 is preferably arranged shortly in front of the dirt separation opening with respect to the direction of rotation of the opening roller 15. Here too, the spinning device 7 is designed as a rotor spinning device with a spinning rotor 12. However, the invention can also be used on all other spinning machines 1, the spinning stations 2 of which have individually driven opening rollers 15.

The present invention is not limited to the exemplary embodiments shown and described. Modifications within the scope of the patent claims are possible, as are any combination of the features described, even if they are shown and described in different parts of the description or the claims or in different exemplary embodiments, provided that there is no contradiction to the teaching of the independent claims.

Reference symbol list

1

Spinning machine

2

Spinning station

3

frame

4

Dissolving device

5

Fiber material

6

Individual fibers

7

Spinning device

8th

yarn

9

Control unit

10

Winding device

11

Kitchen sink

12

Spinning rotor

13

Dissolution housing

14

Single drive

15

opening roller

16

feed roller

17

negative pressure channel

18

Feeding canal

19

blowing nozzle

20

set

21

Valve

22

Maintenance facility

23

Dirt separation opening

Claims (10)

Method for operating a spinning station (2) of a spinning machine (1), in particular a rotor spinning machine, in which a fiber material (5) is dissolved into individual fibers (6) by means of a dissolving device (4) and the individual fibers (6) are dissolved by means of a spinning device (7) are spun into a yarn (8), the opening device (4) containing an opening roller (15) which is rotatably mounted in an opening housing (13) and can be driven by means of an individual drive (14), the spinning device (7) having a vacuum channel (17). the spinning machine (1) is connected and is subjected to negative pressure and wherein the opening housing (13) is connected to the spinning device (7) via a feed channel (18), characterized in that when the spinning station (2) is at a standstill, the opening roller (15) is driven briefly at least once by means of its individual drive (14) and is stopped again, or that during a standstill of the spinning station (2), the opening roller (15) is driven by means of its Single drive (14) is driven at a minimum speed. Method according to the previous claim, characterized in that the opening roller (15) is driven against its regular direction of rotation while the spinning station (2) is at a standstill. Method according to one of the preceding claims, characterized in that the opening roller (15) is briefly driven several times at predetermined time intervals and stopped again. Method according to one of the preceding claims, characterized in that the time intervals are set in a control unit (9) of the spinning station (2) and/or the spinning machine (1). Method according to one of the preceding claims, characterized in that the time intervals are set application-specifically depending on the fiber material (5) used. Method according to one of the preceding claims, characterized in that the opening roller (15) is additionally cleaned by means of a blown air stream, in particular a blown air stream from a blowing nozzle (19) belonging to the spinning unit. Spinning machine (1) with a large number of juxtaposed spinning stations (2), each of which has a dissolving device (4) for dissolving a fiber material (5) into individual fibers (6) and a spinning device (7) for spinning the individual fibers (6) into a yarn (8), wherein the opening device (4) includes an opening roller (15) which is rotatably mounted in an opening housing (13) and can be driven by means of an individual drive (14), the spinning device (7) having a vacuum channel (17) of the spinning machine (1 ) is connected and can be subjected to negative pressure
and wherein the opening housing (13) is connected to the spinning device (7) via a feed channel (18), characterized by a control unit (9) for carrying out the method according to one of the preceding claims. Spinning machine (1) according to the previous claim, characterized in that the opening roller (15) can be driven at predetermined time intervals, the time intervals being adjustable in a control unit (9) of the spinning station (2) and/or the spinning machine (1). Spinning machine (1) according to the previous claim, characterized in that the time intervals can be stored application-specifically depending on the fiber material (5) used in the control unit (9) and / or a system control with an article management system. Spinning machine (1) according to one of the previous device claims, characterized in that the spinning stations (2) each have a spinning station's own blowing nozzle (19) for cleaning the opening roller (15).

Images