EP3626658B1 - Method and device for pivoting a coil in a winding device - Google Patents

Description

The present invention relates to a method for pivoting a bobbin in a winding device when the winding process is interrupted and to the associated winding device. The bobbin rests on a support roller and is formed from a bobbin tube wound with a thread. The bobbin case is rotatably held between two holding arms, each with a receptacle, and the two holding arms are held on a common swivel arm with a swivel axis.

Such winding devices are used in textile machines of various types, for example end spinning machines or winding machines. The bobbin and the bobbin case are rotatably mounted between two holding arms. The two holding arms in turn are held in a common swivel arm with a swivel axis. At the beginning of a winding process, the bobbin tube rests on a support roller and is set in rotation via a drive, whereby a thread or yarn fed between the support roller and the bobbin tube is wound onto the bobbin tube and a bobbin is formed. The most varied types of winding tubes in cylindrical or conical shape made of different materials, for example plastic or paper, are used. The winding tubes can be designed with or without side flanges. During the winding, the thread is moved back and forth along a longitudinal axis of the bobbin tube with a traverse, whereby different types of windings are formed in structure and shape. The bobbin case is driven directly via a motor, which rotates at least one of the bobbin receptacles, or indirectly via a friction roller arranged parallel to the bobbin case. The distribution roller also serves as a back-up roller. The distribution 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. In the case of a direct drive of the bobbin tube, the traversing of the thread is to be provided by a separate laying unit and the bobbin tube is supported by a separate support roller. The thread is between the back-up roller and the bobbin tube or the itself The thread already on the bobbin is clamped and thereby deposited on the bobbin.

As a result of the winding process, a diameter of the resulting bobbin increases steadily due to the thread wound onto the bobbin tube. As a result, the distance between the support roller and the longitudinal axis of the bobbin tube increases, which is compensated for by a movement of the holding arms about the pivot axis of the pivot arm. However, the winding process also increases the weight of the bobbin resting on the support roller or distribution roller. This increases the contact pressure acting on a surface of the coil. So that this contact pressure does not become too great, it is known from the prior art, for example from EP 1 820 764 A2 To use counterweights that keep the contact pressure at an almost constant level. After the winding process has ended, the finished bobbin must be lifted off the support roller or the friction roller in order to be able to remove the bobbin from the holding arms and insert a new bobbin tube. This lifting of the bobbin is brought about by a swiveling process of the swivel arm. According to the prior art, this pivoting process is carried out manually using a lever attached to at least one of the holding arms. To support manual lifting, devices are known in which the manual effort can be reduced by using counterweights.

Further reveals the DE 10 2017 211 467 B3 a winding device which is provided with a drive for moving the bobbin around a pivot axis and with a force measurement for measuring the contact pressure.

The disadvantage of the known designs and methods for bobbin removal is that a great deal of manual force has to be used or complex devices are necessary for lifting the bobbin. It should be noted that a full spool can weigh up to 25 kg, which must be lifted.

The object of the present invention is therefore to propose a method and a device for bobbin removal which enable the bobbin to be pivoted relative to the support or friction roller without the need for a great deal of manual effort.

The object is achieved by a method and a device with the features of the independent patent claims.

A method is proposed for pivoting a bobbin in a winding device when a winding process is interrupted, the bobbin resting on a support roller and being formed on a bobbin tube wound with a thread and the bobbin tube being rotatably held in a bobbin frame between two holding arms each with a receptacle the two holding arms are held on a common swivel arm with a swivel axis. A force measurement is used to measure a force acting on at least one holding arm due to the bobbin resting on the support roller or the weight of the bobbin itself. A force is introduced into this holding arm by manually introducing force, with a force direction of the manually introduced force being determined by evaluating the force measurement and the swivel arm being pivoted according to the direction of force with a drive.

Today's machines with a winding device are equipped with controls which include monitoring of drive positions. Due to the position of the drive and the measured force effect, the control system always knows in which position the winding frame with the bobbin located therein is located. If the winding process is now interrupted due to a malfunction or because the bobbin is full and has to be changed, and a manual force is exerted on one of the holding arms and thus on the winding frame, this is recognized by the control based on the change in the force size from the force measurement. If the coil is in a position where it rests on the support roller and the measured force changes due to the manual action, the control determines the direction of the force action based on the force change and triggers a pivoting movement of the coil frame in the determined direction of force action. If the operating personnel act manually on the bobbin frame by lifting the bobbin frame, a few grams of lifting force are sufficient to cause the control to lift the bobbin frame and thereby the bobbin from the support roller by a pivoting movement. Since the previous winding process controls the weight of the bobbin also knows, the pivoting movement can be maintained as long as the manual force cancels a small part of its own weight. As soon as the manual force is removed, this causes the control to stop the pivoting movement, whereby the winding frame and thus the bobbin are held in the position it has reached. A prerequisite for this is a corresponding drive design for the swivel movement. However, such designs are known from the prior art, such as pneumatic drives or electrical drives which are equipped with appropriate brakes or self-locking gears. After removing the full bobbin and inserting an empty bobbin tube, a slight manual force in the corresponding direction triggers a pivoting movement of the winding frame against the support roller.

The swivel arm is advantageously swiveled for as long as the manual introduction of force continues. As a result, any desired position of the coil can be reached by simply pressing lightly in the desired direction of movement. The controller preferably automatically brings the bobbin into an operating position during a pivoting movement against the support roller. Because the bobbin or the bobbin tube reaches the support on the support roller during a pivoting movement against the support roller, the force is rotated in its direction due to the support and the control recognizes that the operating position has been reached. Because of this, it is possible to initiate only a brief manual force for a pivoting movement against the support roller, since this already triggers an automatic assumption of the operating position of the winding device.

A continuation of the winding process is advantageously enabled when the bobbin rests on the support roller. As long as the bobbin or the bobbin tube are not resting on the support roller, the control system prevents the winding process from starting. This is to prevent a thread from being wound up in an uncontrolled manner.

Furthermore, a winding device for winding a thread onto a bobbin tube is proposed, with a swivel arm with a swivel axis, with two on Swivel arm rotatably arranged and at a distance parallel to each other holding arms, each with a rotatably arranged at the end of the holding arms facing away from the swivel arm for the bobbin tube and with a support roller for supporting the bobbin tube. A drive is provided for moving the swivel arm about the swivel axis and at least one of the holding arms has a force measurement for measuring a force acting on the holding arm. Likewise, at least one of the holding arms has a defined point for manual force introduction and a control is provided, the control determining a direction of movement of the swivel arm about the swivel axis based on a force direction of the manual force introduction.

A thread is wound onto the bobbin tube by traversing and a bobbin is formed, which increases the diameter of the bobbin. When the bobbin is placed on the support roller, the winding frame is automatically pivoted away from the support roller about the pivot axis. During the winding process, the thread is clamped between the bobbin tube or the thread already wound on the bobbin tube and the support roller, so that a tight-fitting winding results on the bobbin tube. A clamping force that is applied thereby increases continuously during a winding process due to the weight of the larger reel. In response to the clamping force F and the lifting of the winding frame, there is a bending moment in the holding arms. The bending moment is measured by a force measurement. The invention makes use of this measurement. An additional force manually introduced into the holding arm signals to the control that the swivel arm and thus the bobbin frame and the bobbin are to be swiveled. For the manual introduction of force, a defined point is provided on one of the holding arms, preferably on the same holding arm as the force measurement. This can be in the form of a marking, a lever or an ergonomically shaped recess. The advantage of a defined point instead of a button or other operating element is that no cabling or other type of signal connection has to be provided between the input point for the command to move the winding frame. The control determines which force is measured by means of the force measurement Direction the manual force application is made and determines the direction for the pivoting movement.

At least one of the holding arms is advantageously designed in two parts and the two parts are connected via the force measurement. The force measurement can be designed, for example, as a load cell or load cell. 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 electrical voltage by means of strain gauges, the electrical resistance of which changes with the expansion. The electrical voltage and thus the change in strain are recorded via a measuring amplifier. This can be converted into a force measurement value due to the elastic properties of the spring body. Bending bars, ring torsion springs or other designs are used as spring bodies. Piezoceramic elements are used in a further type of load cell. The directional deformation of a piezoelectric material creates microscopic dipoles within the elementary cells of the piezoelectric crystal. The summation of the associated electrical field in all unit 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 prior art and are now widely used in force and weight measurement. The force measurement is preferably a bending beam load cell. This has the advantage of a robust and simple construction. The two parts of the holding arm are each attached to the bending beam load cell, whereby the bending beam load cell becomes part of the holding arm.

The drive for moving the swivel arm about the swivel axis is preferably an electric motor. The electric motor is preferably provided with a self-locking gear. This has the advantage that a swiveled up winding frame does not lower itself without actuation of the drive, that is to say it remains in its position even when the drive is de-energized.

The defined point is advantageously designed as an extension of the two-part holding arm. The extension takes the place of the levers known from the prior art which were provided for lifting the reels. It is also possible to mark the extension accordingly and to shape it ergonomically.

Figur 1

eine schematische Draufsicht einer ersten Ausführungsform einer Spulvorrichtung;

Figur 2

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

Figur 3

eine schematische Darstellung einer zweiten Ausführungsform einer Spulvorrichtung und

Figur 4

eine schematische Seitenansicht der Spulvorrichtung in Richtung Y nach Figur 3.

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

Figure 1

a schematic plan view of a first embodiment of a winding device;

Figure 2

a schematic side view of the winding device in the direction X of Figure 1;

Figure 3

a schematic representation of a second embodiment of a winding device and

Figure 4

a schematic side view of the winding device in the direction Y according to FIG.

Figure 1 shows a schematic plan view and Figure 2 a schematic side view in the direction X of FIG Figure 1 a first embodiment of a winding device. The winding device comprises a winding frame 1, this 1 consists of a swivel arm 10 with a swivel axis 11 and a first holding arm 6 and a second holding arm 7. As a result, the holding arms 6 and 7 are pivoted about the pivot axis 11 with the pivot arm 10 by a pivoting movement 14. A drive 13 is provided for the pivoting movement 14 of the winding frame 1; in the embodiment shown, the drive 13 is shown as an electric motor. The swivel arm 10 is held in a machine frame 26 via corresponding supports 24. Furthermore, a receptacle 8 and 9 for a bobbin case 5 are rotatably mounted opposite one another on the end of the holding arms 6 and 7 facing away from the swivel arm 10, in each case via a bearing pin. The first receptacle 8 and the second receptacle 9 are arranged in a common coil axis 18. Between the receptacles 8 and 9 a bobbin case 5 is clamped. One of the two receptacles 8 or 9, for example the receptacle 8, is held displaceably in the direction of the coil axis 18 in the holding arm 6. As a result, a bobbin case 5 can be inserted between the receptacles 8 and 9 and then the receptacle 8 can be pressed against the receptacle 9 and thus the bobbin case 5 can be clamped. In the embodiment shown, the receptacle 9 in the reel axle 18 is connected to a drive wheel 19. The drive wheel 19 is set in rotation by a drive element 20, for example a chain drive, which, due to the connection with the receptacle 9, leads to a rotation of the bobbin tube 5 in the direction of rotation 23.

A support roller 3 is arranged parallel to the bobbin axis 18 of the bobbin tube 5, on which the bobbin tube 5 comes to rest due to the pivoting movement 14 of the pivot arm 10 about the pivot axis 11. The support roller 3 is rotatably fastened in the machine frame 26 by means of corresponding brackets 25. As a result of the rotation of the bobbin tube 5 in a corresponding direction of rotation 23, a thread 4 applied to the bobbin tube 5 is wound onto the bobbin tube 5 and a bobbin 2 is formed. During this winding process, the thread 4 is moved back and forth along the bobbin axis 18 of the bobbin tube 5 with a traversing 21. With the aid of this direction of movement 22 of traversing 21, different types of windings or bobbins 2 can be produced on bobbin tube 5. As a result of the formation of a winding on the bobbin tube 5, the bobbin 2 increases in diameter, as a result of which the winding frame 1 is pivoted away from the support roller 3 about the pivot axis 11 due to the contact with 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 a tight-fitting winding on the bobbin tube 5 results. A clamping force F applied in the process increases continuously due to the weight of the spool 2, which is becoming larger, during a winding process. In order to be able to ensure a constant clamping force F, the drive 13 lifts the winding frame 1 about the pivot axis 11 with a pivoting movement 14 from the support roller 3. However, this lifting is only carried out to the extent that a predetermined clamping force F remains between the spool 2 and the support roller 3. In response to the clamping force F and the lifting of the winding frame 1 through the drive 13 results in a bending moment in the holding arms 8 and 9. The bending moment is measured by a force measurement 12 which is provided in the fastening of the holding arm 6 on the swivel arm 10.

A defined point 17 for the manual introduction of force into the holding arm 6 is provided on the holding arm 6. The defined point 17 is designed as an extension of the holding arm 6. The operating personnel can now easily press against this extension (a few 100 grams are sufficient) and thereby apply a force G or H, depending on the desired direction of movement, to the extension. The force G is applied manually when the bobbin 2 is to be moved away from the support roller 3 and the force H when the bobbin 2 or the bobbin tube 5 is to be moved towards the support roller 3. This introduction of force is determined by the force measurement, whereupon the controller moves the swivel arm 10 and thus the winding frame 1 and the bobbin 2 via the drive 13 by a swivel movement 14 in the corresponding direction.

Figure 3 shows a schematic plan view and Figure 4 a schematic side view in the direction Y of the Figure 3 a first embodiment of a winding device. The structure of the device is with the exception of the force measurement 12 with the Figures 1 and 2 identical, which is why refer to the explanations for a detailed description Figures 1 and 2 is referred. In the embodiment shown, the force measurement 12 is integrated in the holding arm 6. The holding arm 6 is made in two parts. A first part 15 of the holding arm 6 connects the swivel arm 10 with the force measurement 12 and a second part 16 of the holding arm 6 leads from the force measurement 12 via the coil axis 18 to the defined point 17 for the manual introduction of force. The two parts 15 and 16 of the holding arm 6 are screwed to the force measurement 12, the force measurement 12 being designed as a bending beam load cell.

List of reference symbols

1

Winding frame

2

Kitchen sink

3

Backup roll

4th

thread

5

Bobbin case

6th

First holding arm

7th

Second holding arm

8th

First shot

9

Second shot

10

Swivel arm

11

Swivel axis

12th

Force measurement

13th

drive

14th

Swivel movement

15th

First part of the holding arm

16

Second part of the holding arm

17th

Defined point for manual force application

18th

Coil axis

19th

drive wheel

20th

Drive element

21

Traversing

22nd

Direction of movement traversing

23

Direction of rotation of the coil

24

support

25th

Support roller holder

26th

Machine frame

F.

Clamping force

G

Manual force directed away from the back-up roll

H

Manual force directed towards the back-up roll

Claims (9)

1. A method for swiveling a bobbin (2) in a winding device during an interruption of a winding operation, wherein the bobbin (2) rests on a backing roller (3) and is formed on a bobbin tube (5) onto which a thread (4) is wound, and the bobbin tube (5) is rotatably held between two retaining arms (6, 7) via a holder (8, 9) in each case, and the two retaining arms (6, 7) are mounted on a shared swivel arm (10) having a swivel axis (11), whereby a force effect that acts on at least one retaining arm (6) due to contact of the bobbin (2) with the backing roller (3) or the intrinsic weight of the bobbin (2) is measured by a force measurement unit (12), characterized in that a force (G, H) is introduced into this retaining arm (6) by a manual transmission of force, wherein a force direction of the manually introduced force (G, H) is determined by evaluating the force measurement, and by means of a drive (13) the swivel arm (10) is swiveled corresponding to the force direction.
2. The method according to Claim 1, characterized in that the swivel arm (10) is swiveled for as long as the manual transmission of force (G, H) continues.
3. The method according to Claim 1 or 2, characterized in that the controller automatically brings the bobbin (2) into an operating position during a swivel motion (14) against the backing roller (3).
4. The method according to Claim 1 or 2, characterized in that a continuation of the winding operation is enabled when the bobbin (2) rests on the backing roller (3).
5. A winding device for winding a thread (4) onto a bobbin tube (5),

   - having a swivel arm (10) having a swivel axis (11);

   - having two retaining arms (6, 7) that are nonrotatably mounted on the swivel arm (10) and extend at a distance in parallel to one another;

   - having a holder (8, 9) in each case for the bobbin tube (5), rotatably situated on the end of the retaining arm (6, 7) facing away from the swivel arm (10),

   - having a backing roller (3) for supporting the bobbin tube (5)

   - having a drive (13) for moving the swivel arm (10) about the swivel axis (11);

   - having a force measurement unit (12) for measuring a force that acts on the retaining arm (6) and

   - having a controller,
   characterized in that

   - at least one of the retaining arms (6) has a defined location (17) for the manual transmission of force; and

   - the controller determines a direction of movement (14) of the swivel arm (10) about the swivel axis (11) based on the force direction (G, H) of the manual transmission of force.
6. The winding device according to Claim 5, characterized in that at least one of the retaining arms (6) has a two-part design, and the two parts (15, 16) are connected via the force measurement unit (12).
7. The winding device according to Claim 6, characterized in that the force measurement unit (12) is a bending beam load cell.
8. The winding device according to one of Claims 5 to 7, characterized in that the drive (13) for moving the swivel arm (10) about the swivel axis (11) is an electric motor.
9. The winding device according to one of Claims 5 to 8, characterized in that the defined location (17) is designed as an extension of the two-part retaining arm (6).

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