YARN ACCUMULATOR UNIT FOR A WORKSTATION OF A TEXTILE MACHINE

Abstract

A yarn accumulator unit for a workstation with a yarn guide arm pivotally mounted about a pivot axis, and a controllable drive unit for reversing pivoting of the yarn guide arm. The yarn guide arm is to be freely rotatably mounted and to have a magnetically acting first coupling element arranged at a distance from the pivot axis, and for the drive unit to have a second magnetic coupling element arranged so as to be adjustable transversely to the first coupling element or about the pivot axis, magnetically repulsively acting on the first coupling element, which second magnetic coupling element is arranged so that it can be brought into active connection with the first coupling element on the drive unit, in which case an adjustment of the second coupling element in the direction of the first coupling element causes a displacement of the first coupling element in the same direction.

Claims

1. A yarn accumulator unit for a workstation of a textile machine, with a yarn guide arm pivotally mounted about a pivot axis, and a controllable drive unit for reversing pivoting of the yarn guide arm, characterised in that the yarn guide arm is freely rotatably mounted and has a magnetically acting first coupling element arranged at a distance from the pivot axis, and the drive unit has a second magnetic coupling element which is arranged so as to be adjustable relative to the first coupling element, has a magnetically repulsive effect on the first coupling element, and is arranged so that it can be brought into active connection with the first coupling element on the drive unit, in which case an adjustment of the second coupling element in the direction of the first coupling element causes a displacement of the first coupling element in the same direction.

2. The yarn accumulator unit according to claim 1, characterised in that the second coupling element is arranged on a carrier which can be adjusted by the drive unit coaxially about the pivot axis of the yarn guide arm.

3. The yarn accumulator unit according to claim 1, characterised in that the first coupling element is detachably attached to the yarn guide arm.

4. The yarn accumulator unit according to claim 1, characterised in that the drive unit has an electric motor with a drive shaft which is connected to the carrier in a torsionally rigid manner and on which the yarn guide arm is mounted so that it can rotate freely.

5. The yarn accumulator unit according to claim 1, characterised in that the first coupling element and the second coupling element are configured as permanent magnets.

6. The yarn accumulator unit according to claim 1, characterised in that the carrier is arranged on a coupling disc which is arranged coaxially with the drive shaft and is connected to the drive shaft in a torsionally rigid manner.

7. The yarn accumulator unit according to claim 1, characterised in that the yarn accumulator unit has a sensor unit assigned to it which is configured and arranged to detect the rotary movement and/or position of a connection element which is connected in a torsionally rigid manner to the yarn guide arm and is arranged in particular coaxially with respect to the drive shaft.

8. A workstation of a textile machine having a yarn delivery device for delivering a yarn, a traversing device for traversing the delivered yarn, and a yarn winding device for winding the traversed yarn onto a take-up package, which is arranged along a yarn path, characterised by a yarn accumulator unit according to claim 1, which is arranged along the yarn path between the yarn delivery device and the traversing device to force the yarn running along the yarn path out of the yarn path in a defined manner by the pivoting movement of the yarn guide arm.

9. The workstation according to claim 8, characterised in that a rest position of the yarn guide arm is provided in a position crossing the yarn path, in which the yarn guided by the yarn guide arm is forced out of the yarn path during the package journey.

10. The workstation according to claim 8, characterised in that the workstation is assigned a control system and a sensor unit which can be connected to the control system for the exchange of information, in which case the sensor unit is configured and arranged for detecting the rotary movement and/or position of the yarn guide arm and for transmitting sensor information to the control system, and in which case the control system is configured to evaluate and assess the transmitted sensor information, and to control the drive unit in a defined manner on the basis of the assessment result.

11. The workstation according to claim 10, characterised in that the control system is configured to control the drive unit for regulating the yarn tension and/or the accumulation quantity of the guided yarn.

12. A method for adjusting a yarn tension of a running yarn at a workstation according to claim 10, in which the sensor unit transmits sensor information about the rotary movement and/or position of the yarn guide arm to a control system assigned to the workstation, based on the transmitted sensor information, the control system evaluates a magnetic force acting between the first and second coupling element to identify a prevailing yarn tension and, in the event of a deviation from a limit value or limit value range for the yarn tension that is evaluated as impermissible, controls the drive unit in a defined manner to change the position of the yarn guide arm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] An embodiment example of the present invention is explained below with reference to the drawings. In the drawings:

[0031] FIG. 1 is a perspective schematic view of a yarn accumulator unit according to an embodiment example;

[0032] FIG. 2 is a perspective schematic view of an enlarged representation of a partial area of the yarn accumulator unit shown in FIG. 1;

[0033] FIG. 3 is a perspective schematic view of an enlarged representation of the yarn accumulator unit shown in FIG. 1 without a yarn guide arm;

[0034] FIG. 4 is a perspective schematic view of the yarn guide arm of the yarn accumulator unit shown in FIG. 1; and

[0035] FIG. 5 is a perspective schematic view of the yarn accumulator unit shown in FIG. 1 in an arrangement upstream of a paraffining device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] FIG. 1 is a schematic perspective view of a yarn accumulator unit 1 according to an embodiment example, which is connected to a connection plate 17 for arrangement at a workstation, in particular a spinning or winding unit, of a textile machine not shown here. FIGS. 2 to 4 show, in a perspective schematic view, an enlarged representation of a partial area of the yarn accumulator unit 1 shown in FIG. 1 as well as a perspective schematic representation of a yarn guide arm 2 of this yarn accumulator unit 1.

[0037] The yarn accumulator unit 1 has a yarn guide arm 2, which is arranged at the workstation with a yarn guide eye 13 arranged at its free end in the yarn path F of a yarn to be wound onto a take-up package, the yarn being guided by the yarn guide eye 13. To form a yarn accumulator, the yarn guide arm 2 is pivotally mounted on a drive shaft 16 of an electric motor 5 of a drive unit 4 of the yarn accumulator unit 1, with for this purpose the yarn guide arm 2 having a bushing 18 for arrangement on the free end of the drive shaft 16 so that the yarn guide arm 2 is mounted on the drive shaft 16 without torque. The bushing 18 is further connected to a holder 9 connected to the yarn guide arm 2, which has an opening for receiving a first coupling element 6 configured as a permanent magnet.

[0038] For pivoting of the yarn guide arm 2 during loop-forming operation, the drive shaft 16 of the electric motor 5 is in a torsionally rigid connection with a coupling disc 14, which is arranged coaxially with respect to the drive shaft 16. A carrier 8 is arranged on the coupling disc 14, which has a further bushing 12 for receiving a further permanent magnet as the second coupling element 7. The permanent magnets on the yarn guide arm 2 and the carrier 8 are aligned with one another in such a way that they exert a repulsive magnetic effect on one another. A rotation of the coupling disc 14 via the reversing electric motor 5 thus causes, without contact, a corresponding pivoting of the yarn guide arm 2 about the drive shaft 16, which defines a pivot axis S, the electric motor 5 being controlled by a control system not shown here via connection 19.

[0039] For position detection of the yarn guide arm 2, a sensor unit 3 is arranged on a housing cover 11 of the housing 10 above—with reference to the drawing—the drive shaft 16, which sensor unit 3 is arranged with its sensor detecting the pivot angle coaxially with respect to a connection element 15 connected to the yarn guide arm 2, which in turn extends in the longitudinal axis direction of the drive shaft 16.

[0040] At least the rotary movement or the position of the yarn guide arm 2 can be determined particularly reliably via the sensor unit 3, and deviations of the yarn guide arm 2 from the position set by the drive unit 4 can be detected by means of transmitting corresponding sensor information to the control system about this. If, for example, the yarn tension increases, this causes a displacement of the yarn guide arm 2 in the direction of the second coupling element 7 against the spring force generated by the magnetic repulsive effect. Proceeding from this, the control system can then be used to move the coupling disc 14 back. If, for example, the yarn tension decreases in the course of a yarn sag, this causes a displacement of the second coupling element 7 by a rotation of the drive shaft 16 and of the carrier 8 coupled therewith, including the coupling disc 14 and the permanent magnet, in the direction of the yarn guide arm 2. The magnetic repulsive effect causes the yarn guide arm 2 to move in the same direction, which forces the guided yarn out of its path or further away from it, and forms or enlarges a yarn loop. In this way, a substantially constant yarn tension can be achieved and ensured during the entire winding process or package journey.

[0041] FIG. 5 shows, in a perspective schematic view, an embodiment example of an arrangement of the yarn accumulator unit 1 at the workstation which is not shown, in which case the workstation can be a spinning or winding station. The yarn accumulator unit 1 is arranged along a yarn path F, which runs from a yarn delivery device that is not shown in the direction of a traversing device that is not shown, upstream of a paraffining device 20, which is arranged along the yarn path F of the traversing device and is shown only schematically and in parts. The paraffining device 20 has a holder 22 underneath, on which two yarn guide rollers 21 are rotatably held, over which the yarn can be guided partially entwined along the yarn path. The yarn accumulator unit 1 is positioned on the yarn path F in such a way that the yarn guide arm 2 can pivot into the yarn path F with its guide eye 13 in order to force the running yarn out of its yarn path F transversely to the arrangement direction of the yarn guide rollers 21. As a result of being forced out of its yarn path F by means of the yarn accumulator unit 1, the yarn comes into contact with the yarn guide rollers 21, by means of which a yarn loop of defined size is formed between the yarn guide rollers 21. The size of the yarn loop is varied by means of the yarn accumulator unit 1 as a function of the detected rotary movement or position of the yarn guide arm 2 via the control system, which controls the electric motor 5 and consequently the yarn guide arm 2, to set and regulate a yarn tension that is advantageously to be kept constant for the package journey, as required.

LIST OF REFERENCE SIGNS

[0042] 1 Yarn accumulator unit

[0043] 2 Yarn guide arm

[0044] 3 Sensor unit

[0045] 4 Drive unit

[0046] 5 Electric motor

[0047] 6 First coupling element

[0048] 7 Second coupling element

[0049] 8 Carrier

[0050] 9 Holder

[0051] 10 Housing

[0052] 11 Housing cover

[0053] 12 Further bushing

[0054] 13 Yarn guide eye

[0055] 14 Coupling disc

[0056] 15 Connection element

[0057] 16 Drive shaft

[0058] 17 Connection plate

[0059] 18 Bushing

[0060] 19 Connection

[0061] 20 Paraffining device

[0062] 21 Yarn guide roller

[0063] 22 Retainer

[0064] F Yarn path

[0065] S Pivot axis