EP3954638B1 - Winding device - Google Patents

Description

The present invention relates to a device and a method for winding a thread onto a bobbin tube to form a bobbin, with a machine frame and with a control, with a support roller rotatably mounted in the machine frame for supporting the bobbin tube and with a bobbin mandrel for holding the bobbin tube, wherein the bobbin mandrel is held on a pivot lever which is rotatably mounted on a rotation axis in the machine frame.

Such winding devices are used in textile machines of various designs, for example end spinning machines, rewinding machines or winding machines. The bobbin or bobbin sleeve is rotatably mounted between two holding arms or on a bobbin mandrel. The two holding arms or the bobbin mandrel are in turn held in a common swivel arm with a swivel axis. At the start of a winding process (a so-called winding cycle), the bobbin sleeve rests on a support roller and is rotated by a drive, whereby a thread or yarn fed between the support roller and the bobbin sleeve is wound onto the bobbin sleeve and a bobbin is formed. Various types of bobbin sleeves are used in cylindrical or conical shapes made of different materials, for example plastic or paper. The bobbin sleeves can be designed with or without side flanges. During winding, the thread is moved back and forth along a longitudinal axis of the bobbin sleeve with a traversing motion, which creates windings of different construction and shape. The bobbin sleeve is driven directly by a motor that rotates at least one of the sleeve holders or the bobbin mandrel, or indirectly by a friction roller arranged parallel to the bobbin sleeve. The friction roller also serves as a support roller. The friction roller can be designed as a so-called grooved drum. The grooved drum is provided with a yarn guide which is guided in slots by the rotation of the grooved drum in such a way that the thread is moved back and forth. If the bobbin sleeve is driven directly, the traversing of the thread is provided by a separate laying unit and the bobbin sleeve is supported by a separate support roller. The thread is guided between the support roller and the bobbin sleeve. or the thread already on the bobbin tube and thus deposited on the bobbin tube.

During the winding process, the diameter of the resulting spool increases steadily due to the thread wound onto the spool tube. As a result, the distance between the support roller and the longitudinal axis of the spool tube increases. Winding devices are known from the state of the art which are equipped with a swivel drive for this movement. It is also known that swivel drives can be equipped with an angle measurement, which means that a corresponding control system knows at all times which position the swivel drive is in.

However, the winding process also increases the weight of the bobbin resting on the support roller or friction roller. This increases the contact force acting on the surface of the bobbin. In order to prevent this contact force from becoming too great, it is known from the state of the art, for example, to EP 1 820 764 A2 to use counterweights which keep the contact forces at an approximately constant level.

Also revealed is the WO 2019/007729 A1 a winding device in which the contact force is measured and regulated by moving the swivel drive. After the winding process has been completed, the finished bobbin must be lifted off the support roller or the friction roller in order to remove the bobbin from the holding arms and insert a new bobbin sleeve. This lifting of the bobbin is accomplished by swiveling the bobbin.

The EP3575254A1 discloses a winding device for a workstation of a textile machine with a winding roller and a bobbin that can be pressed onto the winding roller, as well as a pressing device. The pressing device contains a pre-tensionable spring element for pressing the bobbin onto the winding roller. The pressing device also comprises an actuating element, in particular an electric motor, which is operatively connected to the spring element and by means of which the spring element can be subjected to a predetermined pre-tension.

The disadvantage of the known designs of the winding devices is that a complex construction and drive technology must be used to move the coil in order to maintain the contact forces.

The object of the present invention is therefore to propose a device and a method for winding a thread onto a spool, which enable a simple and cost-effective construction, without having to forego high quality and uniformity of the spools.

The problem is solved by a device and a method having the features of the independent patent claims.

A winding device for winding a thread onto a bobbin tube to form a bobbin is proposed. The winding device comprises a machine frame and a control system, a support roller rotatably mounted in the machine frame for supporting the bobbin tube and a winding mandrel for holding the bobbin tube, the winding mandrel being held on a pivot lever which is rotatably mounted on a rotation axis in the machine frame. The pivot lever is designed with two lever arms, with the winding mandrel for the bobbin tube being provided on a first lever arm and a linear drive for moving the pivot lever around the rotation axis on a second lever arm. The linear drive is connected to the second lever arm with a push rod via an axle bolt and is pivotably held in the machine frame. A force measurement is arranged between the axle bolt and the holder of the linear drive in the machine frame. The design of the winding device is significantly simplified by using a winding mandrel instead of a previously common bobbin frame. A single pivot lever attached to one side of the winding mandrel is sufficient to support the winding mandrel. The swivel lever comprises two lever arms, with a rotation axis provided at the intersection of the two lever arms, which forms a fixed point and is fixedly connected to the machine frame. The linear drive attached to the second lever arm is attached to an axle bolt via the push rod so that it can rotate. At the end of the linear drive opposite the axle bolt, there is another rotationally movable attachment to the machine frame. The linear drive moves the coil mandrel towards or away from the support roller with a ratio corresponding to the two lever arms.

The force measurement can be arranged on either side of the linear drive. When the linear drive is operated, the winding tube is pressed onto the support roller via the swivel lever. The resulting contact force can be increased or reduced by a corresponding movement of the linear drive. Since the force measurement is provided between the stationary bracket of the linear drive and the swivel lever, the force measurement measures a force that is directly proportional to the contact force. The force measurement can be carried out as a hydraulic or mechanical force measurement. The force measurement is advantageously carried out as a load cell arranged between the axle bolt and the bracket of the linear drive. This enables a simple and compact design, and a load cell can also be easily coupled directly to a control system. Various types of so-called force transducers can be used in load cells. For example, the use of force transducers is known in which the force acts on an elastic spring body and deforms it. The deformation of the spring body is converted into a change in an electrical voltage via strain gauges, whose electrical resistance changes with the strain. The electrical voltage and thus the change in strain are registered via a measuring amplifier. This can be converted into a force measurement value due to the elastic properties of the spring body. Bending beams, ring torsion springs or other designs are used as spring bodies. Piezoceramic elements are used in another type of load cell. The directed deformation of a piezoelectric material causes microscopic dipoles to form within the elementary cells of the piezo crystal. The summation of the associated electric field in all elementary cells of the crystal leads to a macroscopically measurable electrical voltage, which can be converted into a force measurement value. Load cells are known from the state of the art and are now widely used in force and weight measurement. As an alternative to arranging the force measurement between the axle bolt and the bracket of the linear drive, a force measurement can be carried out directly via the axle bolt. The axle bolt is also designed to function as a pivoting connection between the bracket and the pivot lever as a force-introducing component of a force measurement.

Preferably, and in order to further simplify the design, the linear drive is connected to the bracket via the load cell. The load cell is designed so that it can be used as part of a bracket. In a more advanced version, the load cell can also be attached to the machine frame in a rotatable manner.

The linear drive can be a pneumatic or electric drive. However, it is advantageous if the linear drive is an electric stepper motor with a resolution of less than 0.06 mm per step. Linear drives are available in many different designs. However, in order to enable the most precise control of the force of the coil on the support roller, a linear drive with the smallest possible step size is advantageous. It has been shown that with today's winding device arrangements, a step size of less than 0.06 mm is preferable. The design of the linear drive should also be selected in such a way that the pivot lever can be moved manually against the de-energized linear drive. In the event of a fault, it may be necessary to manually lift the coil from the support roller and this should be possible without mechanically decoupling the linear drive.

In a preferred embodiment, a drive for the winding mandrel is arranged on the first lever arm. The additional weight of this drive, which also influences the contact force of the bobbin sleeve on the support roller, can be absorbed by the corresponding movement of the linear drive. This direct drive of the winding mandrel instead of an indirect drive of the bobbin with the help of the support roller enables slip-free control of the winding speed. There are also fewer losses in the form of friction and mechanical transmission, which leads to lower energy consumption of the bobbin drive.

Advantageously, a handle with a release button is provided on the second lever arm for manually releasing the winding mandrel. The spool sleeve is held on the winding mandrel by spreading the winding mandrel. The diameter of the winding mandrel is increased by spring force and the spool sleeve is thus clamped. In order to avoid having to pull the full spool off the winding mandrel against the spring force when replacing a full spool with a new spool sleeve or to push the new spool sleeve onto the winding mandrel against the spring force, a corresponding release button is provided which releases the spring. As long as the release button is pressed, the spool can be pulled off the winding mandrel without resistance. It is also conceivable that the spring is released when the release button is pressed for the first time and that the spring is re-tensioned or released when the release button is pressed for the second time. is released. Furthermore, the handle is also used to move the spool or the spool mandrel away from or towards the support roller without the help of the linear drive. By applying a slight manual force to the swivel arm or the handle, a resistance moment of the linear drive can be overcome and the spool or the spool mandrel can also be moved manually into the desired position.

Preferably, a stop is provided on the pivot lever, which prevents the winding mandrel from resting on the support roller if the bobbin sleeve is missing. Depending on the arrangement of the pivot lever, an advantageously adjustable stop is provided on the first or second lever arm of the pivot lever. The pivoting movement of the winding mandrel against the support roller until it touches it is thereby prevented. Since in a winding process the thread to be wound runs over the support roller, i.e. is guided by a surface of the support roller, it is important that the surface of the support roller is not damaged.

A method is also proposed for winding a thread onto a bobbin tube to form a bobbin using a winding device as described above. The winding device has a machine frame and a control system and a support roller and a winding mandrel that are rotatably mounted in the machine frame. During the winding process, the bobbin rests on the support roller and the winding mandrel is held on a pivoting lever that is rotatably mounted in the machine frame. The pivoting lever has a first holding arm with the winding mandrel and a second lever arm with a linear drive, the linear drive being connected to the second lever arm with a push rod via an axle bolt and being pivotably mounted in the machine frame. A force measurement is arranged between the axle bolt and the holder of the linear drive in the machine frame. Before the winding process, an empty bobbin tube is pushed onto the winding mandrel. The winding mandrel is then pivoted by the linear drive via the pivot lever until the spool sleeve rests on the support roller: The force measurement measures a contact force between the support roller and the spool sleeve and the control system uses the linear drive to move the pivot lever until a predetermined contact force is reached. Advantageously During a winding cycle, the contact force is regulated within a predetermined range by controlling the linear drive.

With the help of the force measurement, a value is determined which, taking into account the technical conditions of the machine, is directly proportional to the contact force. In this case, it is not the contact force between the spool or spool sleeve and the support roller that is measured directly, but rather the force with which the linear drive is supported against the machine frame. The weight of the swivel lever together with any existing drive of the winding mandrel and the winding mandrel itself must be taken into account in their influence on the force measurement. The resulting forces acting on the force measurement change as the diameter of the spool increases due to the swivel movement of the swivel lever and an associated change in the horizontal distance between the winding mandrel and its fixed axis of rotation.

It is therefore advantageous if, after sliding the spool sleeve onto the winding mandrel, the winding mandrel with the empty spool sleeve is pivoted once for calibration. Such calibration by pivoting the winding mandrel with the empty spool sleeve up once must be repeated each time a different spool sleeve is used. The pivoting movement enables the control system to detect the forces and subsequently take them into account. However, the force measured during the winding process is proportional to the contact force due to the leverage and taking into account the corresponding corrections based on the machine's technical conditions. The force measured in this way is determined by the weight of the spool and the pressing force of the spool on the support roller, which is exerted by the pivoting lever or the linear drive assigned to it. If the diameter of the spool increases, the lever arm of the pivoting lever on the spool side is pushed away from the support roller and at the same time held in position by the opposite lever arm of the pivoting lever via the linear drive, or at least hindered in its movement. The intended control compares the measured force with a target value and corrects the position of the pivot lever by a linear movement of the push rod so that the measured actual value of the force corresponds to a predetermined target size. This means that the thread is always placed on the bobbin under the same contact pressure or a contact pressure adapted to the winding cycle over the entire winding cycle. Without such a control, the thread layers on the bobbin would become increasingly dense over the winding cycle, which would have a negative effect on later unwinding in the subsequent processes of thread processing. Furthermore, the contact pressure can be reduced as the bobbin size increases, which has the advantage that the bobbin core is not compressed by the outer layers. This means that the bobbins produced are of high quality and uniformity.

As the thread runs onto the spool, the diameter of the spool increases continuously, which causes the swivel lever to rotate and thus also changes the load on the force measurement. The control system detects this change via the force measurement and can restore the previous force ratios by moving the linear drive accordingly. When a predetermined spool diameter is reached, winding is switched off. In addition, in the event of a disruption to the winding operation, the current diameter of the spool is known at any time by counting the steps of the linear drive, so that before operation is resumed, a decision can be made based on the diameter whether winding should continue with the existing spool that has been started or whether it would be better to replace the spool with an empty spool sleeve.

Preferably, when a predetermined spool diameter is reached, the winding is stopped and the spool is lifted off the support roller by the linear drive. The predetermined spool diameter can be determined in various ways. The length of the spooled thread can be determined or calculated using the winding speed and the current spool diameter can be determined from this. It is also possible to use sensors to detect the deflection of the pivot lever or the movement of the linear drive and use this to determine the spool diameter. The term "reaching a predetermined spool diameter" can therefore also include the specification of a certain thread length, duration of a winding or movement of the linear drive or degree of pivoting of the pivot lever. understood. Once the spool has been lifted, it can be removed from the spool mandrel manually or with the help of an automatic removal machine after or while the spool mandrel tensioning device has been released manually or automatically. In the lifted state, the final weight of the finished spool can be determined by measuring the force.

After an empty bobbin tube has been pushed onto the bobbin mandrel and its clamping, the swivel lever is moved by the linear drive until the bobbin tube rests on the support roller and a predetermined contact force is reached.

Preferably, a winding machine or a rewinding machine is equipped with a device as described above, which makes the machine itself easy to operate and inexpensive to manufacture.

Figur 1

eine schematische Draufsicht einer Ausführungsform einer Spulvorrichtung nach der Erfindung und

Figur 2

eine schematische Seitenansicht der Spulvorrichtung in Richtung X nach Figur 1.

Further advantages of the invention are described in the following embodiment. They show:

Figure 1

a schematic plan view of an embodiment of a winding device according to the invention and

Figure 2

a schematic side view of the winding device in direction X according to Figure 1.

Figure 1 shows a schematic plan view and Figure 2 a schematic side view in direction X of the Figure 1 an embodiment of a 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 which is also held on the pivot lever 8. An alternative to this type of drive would be an indirect drive of the winding mandrel 7 via a support roller 3. A bobbin sleeve 5 is held in a rotationally fixed manner on the winding mandrel 7 with the aid of a tensioning device (not shown). The tensioning 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 or the bobbin sleeve 5 has to be changed. The pivot lever 8 is held stationary in a rotation 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 winding mandrel 7 with its drive 17 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, when the linear drive 12 moves, the pivot lever 8 is rotated about the axis of rotation 9, which results in the distance of the winding mandrel 7 from the support roller 3 being 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 on the side opposite the axle bolt 13 with a bracket 14. A force measurement 15 is inserted between the bracket 14 and the linear drive 12.

The support roller 3 is arranged parallel to the spool axis of the spool mandrel 7, on which the spool sleeve 5 comes to rest due to the pivoting movement 25 of the pivoting lever 8 about the axis of rotation 9. The support roller 3 is rotatably mounted in the machine frame 6 by corresponding supports 27. By rotating the spool sleeve 5 in a corresponding direction of rotation 23, a thread 4 applied to the spool sleeve 5 is wound onto the spool sleeve 5 and a spool 2 is formed. In the process, the support roller 3 is set in rotation in the corresponding direction of rotation 24 via the support of the spool 2 on the support roller 3. During this winding process, the so-called winding cycle, the thread 4 is moved back and forth along the spool axis of the spool sleeve 5 using a traversing mechanism 22. With the help of this direction of movement of the traversing mechanism 22, different types of windings or spools 2 can be produced on the spool sleeve 5. By forming a winding on the spool sleeve 5, the spool 2 increases in diameter 28, whereby the spool mandrel 7 and thus the first lever arm 10 of the support roller 3 are pivoted away from the support roller 3 about the axis of rotation 9 due to the contact with the support roller 3. During the winding process, the thread 4 is clamped between the spool sleeve 5 or the thread 4 already wound on the spool sleeve 5 and the support roller 3, so that a tight winding is produced on the spool sleeve 5. A clamping force or contact force 20 applied in this process constantly increases due to the weight of the growing spool 2 during a winding process. In order to be able to guarantee a constant clamping force, the swivel arm is moved by the linear drive 12. 11 is moved about the axis of rotation 9 with a linear movement 26 and in this way the coil 2 is lifted off the support roller 3 via the second lever arm 11. This lifting is only carried out to such an extent that a predetermined clamping force remains between the coil 2 and the support roller 3. In response to the clamping force and the lifting of the coil 2 by the linear drive 12, there is a change in the force applied to the force measurement 15. The force measurement 15 and the linear drive 15 are connected to a controller 21. The force measured by the force measurement 15 is directly proportional to the contact force 20 between the coil 2 and the support roller 3. The controller 21 can therefore set the linear drive 15 in motion according to a predetermined contact force 20 and regulate the contact force 20 to a constant value.

The present invention is not limited to the embodiments shown and described. Modifications within the scope of the patent claims are also possible without departing from the scope of the following claims.

List of reference symbols

1

Winding device

2

Kitchen sink

3

Support roller

4

thread

5

Coil sleeve

6

Machine frame

7

Spool mandrel

8th

Swivel lever

9

Rotation axis

10

First lever arm

11

Second lever arm

12

linear actuator

13

Axle bolt

14

bracket

15

Force measurement

16

Push rod

17

drive

18

Handle

19

Shutter button

20

Contact force

21

steering

22

Change

23

Coil rotation direction

24

Direction of rotation of support roller

25

Swivel movement

26

Linear movement

27

Support roller

28

Coil diameter

Claims (12)

1. Winding device (1) for winding a thread (4) onto a bobbin tube (5) for forming a bobbin (2), comprising a machine frame (6) and a controller (21), a support roller (3) rotatably mounted in the machine frame (6) for supporting the bobbin tube (5) or the bobbin (2), and a winding mandrel (7) for holding the bobbin tube (5), wherein the winding mandrel (7) is held on the pivot lever (8) which is rotatably mounted on a rotary axis (9) in the machine frame (6), wherein the pivot lever (8) is designed with two lever arms (10, 11), wherein the bobbin mandrel (7) for the bobbin tube (5) is provided on a first lever arm (10) and a linear drive (12) for moving the pivot lever (8) about the rotary axis (9) is provided on a second lever arm (11), the linear drive (12) being connected to the second lever arm (11) using a push rod (16) via an axle bolt (13) and held in the machine frame (6) so as to be pivotable, and in that a force measurement device (15) is arranged between the axle bolt (13) and the holder (14) of the linear drive (12) in the machine frame (6).
2. Winding device (1) according to claim 1, characterized in that the force measurement device (15) is designed as a load cell arranged between the axle bolt (13) and the holder (14) of the linear drive (12).
3. Winding device (1) according to claim 2, characterized in that the linear drive (12) is connected to the holder (14) via the load cell.
4. Winding device (1) according to any of claims 1 to 3, characterized in that the linear drive (12) is a stepping motor with a resolution of less than 0.06 mm per step.
5. Winding device (1) according to any of claims 1 to 4, characterized in that a drive (17) for the winding mandrel (7) is arranged on the first lever arm (10).
6. Winding device (1) according to any of claims 1 to 5, characterized in that a handle (18) having a release button (19) for manually releasing the winding mandrel (7) is provided on the second lever arm (11).
7. Winding device (1) according to claim 6, characterized in that a stop is provided on the pivot lever (8) which prevents the winding mandrel (7) from abutting against the support roller (3) if the bobbin tube (5) is missing.
8. Method for winding a thread (4) onto a bobbin tube (5) for forming a bobbin (2) using a winding device (1), wherein the winding device (1) has a machine frame (6) and a controller (21) and a support roller (3) rotatably mounted in the machine frame (6), and a winding mandrel (7), wherein the bobbin (2) abuts against the support roller (3) during the winding process and wherein the winding mandrel (7) is held on a pivot lever (8) which is rotatably mounted in the machine frame (6), wherein the pivot lever (8) has a first holding arm (10) having the winding mandrel (7) and a second lever arm (11) having a linear drive (12), wherein the linear drive (12) is connected to the second lever arm (11) using a push rod (16) via an axle bolt (13) and is held in the machine frame (6) so as to be pivotable, and wherein a force measurement device (15) is arranged between the axle bolt (13) and the holder (14) of the linear drive (12) in the machine frame (6), comprising the method steps:

   a) before the winding process, an empty bobbin tube (5) is pushed onto the winding mandrel (7);

   b) the winding mandrel (7) is pivoted by the linear drive (12) via the pivot lever (8) until the bobbin tube (5) abuts against the support roller (3);

   c) an abutment force (20) between the support roller (3) and the bobbin tube (5) is measured using the force measurement device (15);

   d) the pivot lever (8) is moved by the controller (21) using the linear drive (12) until a specified abutment force (20) is reached.
9. Method according to claim 8, characterized in that, after the bobbin tube (5) has been pushed onto the winding mandrel (7), the winding mandrel (7) with the empty bobbin tube (5) is pivoted once for calibration.
10. Method according to either claim 8 or claim 9, characterized in that, during a winding cycle, the abutment force (20) is regulated in a predetermined range by controlling the linear drive (12).
11. Method according to any of claims 8 to 10, characterized in that, when a specified bobbin diameter (28) is reached, winding is stopped, and the bobbin (2) is lifted off the support roller (3) by means of the linear drive (12).
12. Winding machine comprising at least one winding device according to any of claims 1 to 7.

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