Textile machine producing cross-wound packages

Abstract

A textile machine for producing cross-wound packages, comprising a plurality of workstations, each of which has at least one pneumatic consumer, and comprising a suction system which has at least one vacuum source to which the pneumatic consumers of the workstations are connected via a machine-length vacuum duct arranged in the region of the central axis between two rows of workstations. In order to modify such a textile machine producing cross-wound packages in such a way that it is ensured that the required minimum spinning vacuum is always available at all workstations of the textile machine during spinning operation, according to the invention the textile machine producing cross-wound packages has, in addition to the vacuum duct, a machine-length bypass duct which is also installed in the region of the central axis and is arranged above chain ducts for service units.

Claims

1. A textile machine for producing cross-wound packages, comprising a plurality of workstations, each of which has at least one pneumatic consumer, and comprising a suction system which has at least one vacuum source to which the pneumatic consumers of the workstations are connected via a machine-length vacuum duct arranged in the region of the central axis between two rows of workstations, characterised in that the textile machine producing cross-wound packages has, in addition to the vacuum duct, a machine-length bypass duct, which is installed in the region of the central axis and is arranged above chain ducts for service units.

2. The textile machine for producing cross-wound packages according to claim 1, characterised in that the bypass duct connected to the vacuum source is connected to the vacuum duct at the region of the textile machine opposite the vacuum source.

3. The textile machine for producing cross-wound packages according to claim 1, characterised in that the bypass duct is mounted on a frame apparatus arranged between the chain ducts.

4. The textile machine for producing cross-wound packages according to claim 2, characterised in that the bypass duct is mounted on a frame apparatus arranged between the chain ducts.

5. The textile machine for producing cross-wound packages according to claim 3, characterised in that the frame apparatus has pipe holders for mounting the bypass duct.

6. The textile machine for producing cross-wound packages according to claim 1, characterised in that the vacuum duct has a cross-section that is rectangular.

7. The textile machine for producing cross-wound packages according to claim 1, characterised in that the bypass duct has a circular cross-section.

Description

DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a side view of a textile machine producing cross-wound packages in the form of an open-end rotor spinning machine comprising a suction system for supplying the workstations with spinning vacuum, said system having a machine-length vacuum duct and a bypass duct,

(2) FIG. 2 is a schematic plan view of a suction system designed according to the invention for supplying the pneumatic consumers at the workstations of a textile machine producing cross-wound packages,

(3) FIG. 3 is a perspective view of a portion of a suction system configured according to the invention, having a machine-length vacuum duct, which is at least partly angular in cross-section, and a bypass duct, which is round in cross-section and is arranged between the workstations in the region of the central longitudinal axis of an open-end rotor spinning machine.

(4) FIG. 1 is a side view of a textile machine producing cross-wound packages, in the embodiment example an open-end rotor spinning machine 1, which has a plurality of similar workstations 2 arranged next to one another. This means that such open-end rotor spinning machines 1 each have a plurality of identically designed workstations 2 arranged in a row both in the region of their machine front and in the region of their machine rear. The two rows of workstations are positioned in a mirror-image arrangement in relation to the central axis 17.

(5) As is known, the workstations 2 of such textile machines 1 generally each have an open-end rotor spinning device 3 and a winding device 4. By means of the open-end rotor spinning device 3, which is configured as a pneumatic consumer, a fibre band 6 stored in a spinning can 5 is spun into a thread 7, which is then wound into a cross-wound package 8 on the winding device 4.

(6) As indicated in FIG. 1, the open-end rotor spinning devices 3 of the workstations 2 are each connected via a vacuum connection 29 to a machine-length vacuum duct 18, which is arranged in the region of the central axis 17 of the textile machine 1 and is a component of a suction system 23 belonging to the machine. As shown in FIG. 2, the vacuum duct 18 is connected to a filter chamber 25 upon which a vacuum source 22 acts pneumatically. This means that the open-end rotor spinning devices 3 are supplied with spinning vacuum by the vacuum source 22 via the vacuum duct 18 and the vacuum connections 29 during spinning operation.

(7) For their part, the winding devices 4 each have a package cradle 9 for rotatably mounting a cross-wound package tube and, in this embodiment example, a winding roller 11 for the frictionless driving of a cross-wound package 8 and the simultaneous traversing of the running thread 7. In this case, the package cradle 9 is rotatably mounted in a restricted manner about a pivot axis 15.

(8) As can also be seen, a cross-wound package transport apparatus 12 is arranged between the two rows of workstations and is formed, for example, by two conveyor belts 13, 14 running in parallel. The cross-wound package transport apparatus 12 transports away cross-wound packages 8 which have reached a predeterminable diameter. This means that service units 16, e.g. so-called package doffers, can be moved on corresponding rails 10 or 20 of the open-end rotor spinning machine 1 and patrol along the workstations 2 of the open-end rotor spinning machine 1 during spinning operation. The service units 16 intervene automatically if action is required at one of the workstations 2.

(9) Such a need for action arises, for example, if the cross-wound package 8 has reached its prescribed diameter at one the workstations 2 and has to be exchanged for a new cross-wound package tube. In this case, the package doffer 16 positions itself in front of the relevant workstation 2 and transfers the full cross-wound package 8 from the package cradle 9 of the winding device 4 of the relevant workstation 2 onto an associated conveyor belt 13 or 14 of the cross-wound package transport apparatus 12, the conveyor belt being positioned behind the workstation 2. Next, the service unit 16 swaps a new cross-wound package tube into the package cradle 9, such that the spinning and winding process can be restarted on the relevant workstation 2.

(10) Since open-end rotor spinning devices 3, as described above, always require a certain minimum spinning vacuum during spinning operation and, if no corresponding measures are taken, the vacuum in the vacuum duct 18 gradually decreases with increasing distance from the vacuum source 22, the suction system 23 of the open-end rotor spinning machine 1 is equipped with a bypass duct 19 in addition to the vacuum duct 18. This means that the open-end rotor spinning machine 1 has, in addition to a machine-length vacuum duct 18, which is preferably at least partly rectangular in cross-section, a further, likewise machine-length bypass, duct 19. This bypass duct 19, which is preferably round in cross-section, is advantageously arranged above the chain ducts 21 for the service unit 16 and, as shown in FIG. 2, is connected to the vacuum duct 18 on the side of the textile machine 1 opposite the vacuum source 22.

(11) As shown in FIG. 2, the vacuum duct 18 and the bypass duct 19 extend along a machine longitudinal axis 41. Both ducts are each connected to a filter chamber 25, which can be subjected to a vacuum by at least one vacuum source 22. This means that the vacuum source 22 is driven by a variable-speed electric motor 26, which is connected to the central control unit 28 of the open-end rotor spinning machine 1 via a control line 27. The bypass duct 19 is also connected to the vacuum duct 18 on the side of the textile machine 1 opposite the filter chamber 25. As is usual, pneumatic consumers are connected to the vacuum duct 18 in the region of the workstations 2. This means that an open-end rotor spinning device 3 is connected in the region of workstations 2, in each case via a vacuum connection 29.

(12) However, further pneumatic consumers can be installed in the region of the workstations 2. The workstations 2 can, for example, each be equipped with a thread accumulator nozzle 24.

(13) FIG. 3 is a perspective view of a portion of a suction system 23 of an open-end rotor spinning machine 1.

(14) The suction system 23 configured according to the invention has a machine-length vacuum duct 18, which is at least partly angular in cross-section, and a bypass duct 19, which is round in cross-section. The vacuum duct 18 and the bypass duct 19 are arranged in the region of the central axis 17 of the open-end rotor spinning machine 1 between the rows of workstations.

(15) As can be seen, such open-end rotor spinning machines 1 have a central supporting structure 30 consisting of frame components 31, to which the open-end rotor spinning devices 3 and the winding devices 4 of the numerous workstations 2, among other things, are attached.

(16) The individual frame components 31 of this supporting structure 30 each consist of two vertically arranged supports 32, which are connected by various cross-beams 33-36, preferably by welding. The lower cross-beam 33 forms a base element, which has adjustment apparatuses 37 which enable the frame component 31 to be aligned exactly even on uneven ground.

(17) The vacuum duct 18 is fastened between the two middle cross-beams 34, 35, the cross-beam 34 having a recess 38 for the vacuum duct 18 and the cross-beam 35 forming the basis for a cross-wound package transport apparatus 12 (not shown in FIG. 3).

(18) The upper cross-beam 36 serves, among other things, as a support for the chain ducts 21 of the service units 16. Between the chain ducts 21 a frame apparatus 39 for the bypass duct 19 is also installed, said frame apparatus in turn consisting of vertical beams, horizontal plates and pipe holders 40. The round bypass duct 19 is positioned in the pipe holders 40 in such a way that, on the one hand, the existing installation space is optimally utilised for the installation of said duct and, on the other hand, the operation of the service units 16 is not obstructed in any way.

(19) The concept of the invention is not limited to the embodiment example described above. In the context of the present invention, it is only essential that an additional bypass duct 19, the installation of which makes optimum use of the limited installation space, ensures that there is always an appropriate spinning vacuum at all workstations 2.

LIST OF REFERENCE SIGNS

(20) 1 Open-end rotor spinning machine 2 Workstation 3 Open-end rotor spinning device 4 Winding device 5 Spinning can 6 Fibre band 7 Thread 8 Cross-wound package 9 Package cradle 10 Rail 11 Winding roller 12 Cross-wound package transport apparatus 13 Conveyor belt 14 Conveyor belt 15 Pivot axis 16 Service unit 17 Central axis 18 Vacuum duct 19 Bypass duct 20 Rail 21 Chain duct

(21) 22 Vacuum source 23 Suction system 24 Thread accumulator nozzle 25 Filter chamber 26 Electric motor 27 Control line 28 Central control unit 29 Vacuum connection 30 Supporting structure 31 Frame component 32 Support 33 Cross-beam 34 Cross-beam 35 Cross-beam 36 Cross-beam 37 Adjustment apparatus 38 Recess 39 Frame apparatus 40 Pipe holder 41 Machine longitudinal axis A.sub.1 Cross-section of the vacuum duct A.sub.2 Cross-section of the bypass duct