Winding device

Abstract

A winding device for winding a thread onto a bobbin tube to form a bobbin includes a machine frame, a controller, and a support roller rotatably mounted in the machine frame to support the bobbin tube or the bobbin. A winding mandrel holds the bobbin tube and is pivotally held on a pivot lever that is rotatably mounted on a rotary axis in the machine frame. The pivot lever includes a first and a second lever arm, wherein the winding mandrel is provided on the first lever arm. A linear drive is provided on the second lever arm to move the pivot lever about the rotary axis, wherein the linear drive is connected to the second lever arm via a push rod and an axle bolt and is pivotally attached to the machine frame via a holder. A force measurement device is arranged between the axle bolt and the holder.

Claims

1. A winding device for winding a thread onto a bobbin tube to form a bobbin, comprising: a machine frame; a controller; a support roller rotatably mounted in the machine frame for supporting the bobbin tube or the bobbin; a winding mandrel that holds the bobbin tube, the winding mandrel held on a pivot lever that is rotatably mounted on a rotary axis in the machine frame; the pivot lever comprising a first and a second lever arm, wherein the winding mandrel is provided on the first lever arm; a linear drive comprising a push rod connected directly to the second lever arm via an axle bolt, the linear drive pivotally attached to the machine frame via a holder; and a force measurement device arranged between the axle bolt and the holder, the force measurement device connected to the controller and configured to measure a force transmitted to the push rod directly from the second lever, the force proportional to an abutment force between the bobbin and the support roller; and wherein the controller is configured to provide continuous control of the linear drive and a stroke of the push rod based on an output of the force measurement device to maintain the abutment force at a specified value.

2. The winding device according to claim 1, wherein the force measurement device comprises a load cell.

3. The winding device according to claim 2, wherein the linear drive is connected to the holder via the load cell.

4. The winding device according to claim 1, wherein the linear drive comprises a stepping motor with a resolution of less than 0.06 mm per step.

5. The winding device according to claim 1, further comprising a drive for the winding mandrel arranged on the first lever arm.

6. The winding device according to claim 1, further comprising a handle having a release button to manually release the winding mandrel, the handle provided on the first lever arm.

7. The winding device according to claim 6, further comprising a stop provided on the pivot lever that prevents the winding mandrel from abutting against the support roller when the bobbin tube is absent.

8. A winding machine comprising the winding device according to claim 1.

9. A method of using a winding device to wind a thread onto a bobbin tube to form a bobbin, wherein the winding device includes: a machine frame; a controller; a support roller rotatably mounted in the machine frame, wherein the bobbin abuts against the support roller during a winding process; a winding mandrel held on a pivot lever that is rotatably mounted in the machine frame, the pivot lever having a first holding arm with the winding mandrel provided thereon, and a second lever arm; a linear drive having a push rod connected directly to the second lever arm via an axle bolt, the linear drive pivotally mounted to the machine frame via a holder; and a force measurement device arranged between the axle bolt and the holder, the force measurement device connected to the controller; wherein the method comprises: a) before the winding process, pushing an empty bobbin tube onto the winding mandrel; b) pivoting the winding mandrel with the linear drive via the pivot lever until the bobbin tube abuts against the support roller; c) using the force measurement device, measuring a force transmitted directly to the push rod from the second lever arm, the force corresponding to an abutment force between the support roller and the bobbin tube, wherein the abutment force changes as the bobbin changes in diameter during operation of the winding device; and d) with the controller, continuously controlling movement of the linear drive and a stroke of the push rod based on an output from the force measurement devise to maintain a specified abutment force.

10. The method according to claim 9, wherein after the bobbin tube has been pushed onto the winding mandrel, the winding mandrel with the empty bobbin tube is pivoted once for calibration.

11. The method according to claim 9, wherein during a winding cycle, the abutment force is regulated in a predetermined range by controlling the linear drive.

12. The method according to claim 9, wherein when a specified bobbin diameter is reached, winding is stopped, and the bobbin is lifted off the support roller by means of the linear drive.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages of the invention are described in the following embodiment. In the drawings:

(2) FIG. 1 is a schematic plan view of an embodiment of a winding device according to the invention; and

(3) FIG. 2 is a schematic side view of the winding device in the direction X according to FIG. 1.

DETAILED DESCRIPTION

(4) Reference will now be made to embodiments of the invention, one or more examples of which are shown in the drawings. Each embodiment is provided by way of explanation of the invention, and not as a limitation of the invention. For example features illustrated or described as part of one embodiment can be combined with another embodiment to yield still another embodiment. It is intended that the present invention include these and other modifications and variations to the embodiments described herein.

(5) FIG. 1 shows a schematic plan view and FIG. 2 shows a schematic side view in the direction X of FIG. 1 of an embodiment of the winding device 1. The winding device 1 comprises a winding mandrel 7 which is rotatably mounted on a pivot lever 8. In the embodiment shown, the winding mandrel 7 is set in rotation by a drive 17 also held on the pivot lever 8. An alternative to this form of drive would be an indirect drive of the winding mandrel 7 via a support roller 3. A bobbin tube 5 is held non-rotatably on the winding mandrel 7 with the aid of a tensioning device (not shown). The clamping device of the winding mandrel 7 can be released via a release button 19 which is attached to a handle 18 on the pivot lever 8 when a full bobbin 2 and/or the bobbin tube 5 has to be changed. The pivot lever 8 is held in a fixed position in a rotary axis 9 on the machine frame 6. The pivot lever 8 consists of a first lever arm 10 and a second lever arm 11. The drive 17 of the winding mandrel 7 is attached to the first lever arm 10. A linear drive 12 is attached to the second lever arm 11 via an axle bolt 13. By connecting the linear drive 12 to the pivot lever 8 via the axle bolt 13 at an outer end of the second lever arm 11, the pivot lever 8 is rotated about the rotary axis 9 when the linear drive 12 moves, with the result that the distance between the winding mandrel 7 and the support roller 3 is changed. The linear drive 12 is connected to the axle bolt 13 via a push rod 16 and is rotatably attached to the machine frame 6 with a holder 14 on the side opposite the axle bolt 13. A force measurement device 15 is inserted between the holder 14 and the linear drive 12.

(6) The support roller 3 is arranged parallel to the bobbin axis of the winding mandrel 7, against which the bobbin tube 5 abuts due to the pivoting movement 25 of the pivot lever 8 about the rotary axis 9. The support roller 3 is rotatably attached in the machine frame 6 by means of corresponding supports 27. By rotating the bobbin tube 5 in a corresponding direction of rotation 23, a thread 4 placed on the bobbin tube 5 is wound onto the bobbin tube 5 and a bobbin 2 is formed. In this case, the support roller 3 is also set into rotation in the corresponding direction of rotation 24 by abutting the bobbin 2 against the support roller 3. During this winding process, the so-called winding cycle, the thread 4 is moved back and forth along the bobbin axis of the bobbin tube 5 with a traverse 22. With the aid of this direction of movement of the traverse 22, different types of windings or bobbins 2 can be produced on the bobbin tube 5. As a result of the formation of a winding on the bobbin tube 5, the bobbin 2 increases in diameter 28, whereby the winding mandrel 7 and thus the first lever arm 10 of the pivot lever 8 is pivoted about the rotary axis 9, away from the support roller 3 due to the abutment against the support roller 3. During the winding process, the thread 4 is clamped between the bobbin tube 5 or the thread 4 already wound on the bobbin tube 5 and the support roller 3, so that it results in a tight-fitting winding on the bobbin tube 5. A clamping force or abutment force 20 applied in the process increases continuously during a winding process due to the dead weight of the increasing bobbin 2. In order to be able to ensure a constant clamping force, the linear drive 12 moves the second pivot arm 11 about the rotary axis 9 with a linear movement 26 and thereby lifts the bobbin 2 from the support roller 3 via the first lever arm 10. However, this lifting is only carried out to the extent that a predetermined clamping force remains between the bobbin 2 and the support roller 3. As a reaction to the clamping force and the lifting of the bobbin 2 by means of the linear drive 12, there is a change in the force applied to the force measurement device 15. The force measurement device 15 as well as the linear drive 12 are connected to a controller 21. The force measured with the force measurement device 15 is directly proportional to the abutment force 20 between the bobbin 2 and the support roller 3. The linear drive 12 can thus be set in motion by the controller 21 in accordance with a specified abutment force 20 and the abutment force 20 can be regulated to a constant value.

(7) The present invention is not limited to the embodiments shown and described. Modifications within the scope of the claims are possible as well as a combination of the features, even if these are shown and described in different embodiments.

LIST OF REFERENCE SIGNS

(8) 1 Winding device 2 Bobbin 3 Support roller 4 Thread 5 Bobbin tube 6 Machine frame 7 Winding mandrel 8 Pivot lever 9 Rotary axis 10 First lever arm 11 Second lever arm 12 Linear drive 13 Axle bolt 14 Holder 15 Force measurement device 16 Push rod 17 Drive 18 Handle 19 Release button 20 Abutment force 21 Controller 22 Traverse 23 Direction of rotation of the bobbin 24 Direction of rotation of the support roller 25 Pivoting movement 26 Linear movement 27 Support support roller 28 Bobbin diameter