JP2005335954A - Method and device for operating winder of fiber machine for manufacturing cross-winding bobbin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device capable of cost-suitably designing a thread guide driving device of a winder without having negative influence on quality of a cross-winding bobbin tried to be manufactured. <P>SOLUTION: A traversing thread guide 7 is accelerated associatively to a traversing stroke width. A thread guide driving device 8 and a control device 10 are used, and a thread guide 7 is controlled to be exposed to maximum acceleration only by a traverse stroke where a reversal point 14 exists in an area of a bobbin flank 15. That is, the driving device is applied with a load in a short time in 3 to 5 times a motor current thermally allowed in continuous operation. The load is applied as much as 1.5 to 2.5 times motor operation allowed in the continuous operation in the shortened traverse stroke. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and a device for operating a winding device of a textile machine for producing a traverse bobbin as described in the superordinate concept of claim 1.

  It is known that at least two prerequisites must be met in order for a winding bobbin of a textile machine to produce a traverse bobbin. One is that the bobbin is rotated while the yarn is being wound, and the other is that the bobbin is rotated by the yarn guide that is threaded onto the rotating bobbin and is moved, for example, by traverse movement by the yarn displacement device. It must be traversed along the axis.

  A thread displacement device of the above type having a traverse movable thread guide is known in numerous configurations and is described in detail, for example, in DE 37 25 812 A1, DE 1996 0024 A 1, EP 0 453 622 B 1 or US-PS 4771960.

  During the traverse movement, the yarn supplied to the traverse bobbin draws one circumferential circle in the bobbin flank region, resulting in the formation of a raised bobbin flank.

  That is, in the bobbin flank region (reversal section) of the traverse bobbin where the direction of movement of the yarn guide is reversed, a larger amount of yarn is wound more clearly than in the region where the yarn guide is moved at a constant speed. Thus, if no special measures are taken, material build-up occurs in the bobbin flank region of the traverse bobbin.

  In the case of a freely programmable thread transfer device, only one part of the thread travel or traversing stroke of the yarn guide is performed up to the bobbin flank, while the other part of the traverse stroke is already in the bobbin flank. It is changed so that the thread guide is reversed in front. The change of the traverse process called respiration is described in many documents (for example, DE10104679A1).

  In this case, the traverse stroke is changed in an area determined by the maximum traverse stroke and the minimum traverse stroke. Preferably, the continuous traversing stroke is a shortened traversing stroke followed by an extended traversing stroke, and a shortened traversing stroke is once again shortened to an extended traversing stroke. It is changed to continue. In this manner, a stable bobbin structure can be achieved without forming a saddle portion in the bobbin flank region.

  Another somewhat different method for avoiding high bobbin edges is described in DE 198 35 888 A1. In this known method, the acceleration and deceleration of the traverse yarn guide is controlled so that the length of the yarn guide reversal section increases with the bobbin diameter growth.

  Furthermore, DE 198 07 030 A1 discloses a method for correcting the winding of the yarn in the edge region irrespective of the breathing and irrespective of the length of the traversing stroke. In this known method, acceleration and reduction of the yarn guide are used to influence the yarn winding. That is, according to the prescribed control of the yarn guide driving device, acceleration and reduction of the yarn guide are controlled such that the length of the yarn reversal section changes. Due to the change in the length of the reversal section, the yarn is wound at different angles with respect to the end surface of the bobbin, and as a result, even distribution of the yarn is already achieved immediately after the reversal point.

  As described above, the circle drawn in the bobbin flank region by the yarn wound around the outer peripheral surface of the twill-wound bobbin has a significant meaning for the structure of the bobbin flank.

  This so-called reversal diameter is determined by the acceleration of the yarn guide and the spacing between the yarn guide and the yarn winding point on the bobbin, which not only affects the mass distribution in the traverse bobbin, but also the so-called inclined chamfer in the bobbin flank. It is also an important influence factor when it occurs. Such slanted chamfers prevent orderly feeding of the yarn from the twill-wound bobbin, which in turn creates unacceptable quality defects in the twill-wound bobbin. In order to avoid inclined chamfers, it is necessary to keep the reversing circle diameter of the yarn at a limit value that is also relevant to other textil parameters, especially in the bobbin flank region of the traverse bobbin. Since the spacing between the yarn guide and the yarn winding point on the bobbin is fixed, the only possibility to reduce the reverse circle diameter is to increase the acceleration of the yarn guide.

  In the known method, when a traverse bobbin is manufactured by a high-speed winder, the yarn traverse is mainly a short acceleration period after one reversal point, a constant speed movement in the center of the bobbin, and another reversal. Starting from the generally known fact that it consists of a short deceleration period before the point. The yarn acceleration and deceleration values are extremely high at the reversal point. This is because the movement of the yarn takes place at a frequency reaching 30 Hz according to the process guidance.

  Furthermore, according to EP 0 453 622 B1, a method or device is known which allows a high acceleration of the yarn guide at the reversal point and at the same time is very flexible with respect to the winding structure of the traverse bobbin. In this case, the yarn guide drive is loaded with a motor current that exceeds the nominal current while the yarn guide is near the reversal point and in other areas with a motor current that is lower than the nominal current.

In a yarn guide loaded by an electric motor type driving device, for example, a DC motor, the acceleration of the yarn guide is proportional to the supplied motor current. At the same time, the loss output of the motor released in the form of heat is proportional to the square of the motor current. This means that the main part of the loss output generated during the yarn guide acceleration period is responsible for the thermal load of the drive. Since such an electric motor type driving device must be designed according to its thermal load, the reverse acceleration of the yarn guide mainly determines the configuration dimensions of the motor to be used and thus the manufacturing costs. However, this expression does not apply to all individual acceleration periods, but to the average value of the loss output generated in the acceleration period, based on the large time constant that the motor heats.
DE3725812A1 Specification DE 19960024A1 specification EP 0453622B1 specification US-PS4771960 specification DE10104679A1 specification DE19835888A1 Specification DE 19807030 A1 specification

  Starting from the said prior art, the object of the present invention is to enable a cost-effective design of the yarn guide drive device of the winding device without negatively affecting the quality of the traverse bobbin to be manufactured. A method and apparatus is provided.

  The object of the present invention has been solved by a method according to claim 1 or by an apparatus according to claim 5.

  Advantageous embodiments of the invention are described in dependent claims 2 to 4 or claim 5.

  The method of the present invention is that the average thermal load of the yarn guide drive can be significantly reduced by a special control-technical combination of traversing stroke width and yarn guide acceleration. In other words, with the method according to the invention, a relatively high acceleration value of the yarn guide can be achieved with a relatively small drive device where this acceleration value is required, but at the same time small and thus cost-effective drive device. In spite of the use, the yarn guide driving device is not thermally excessively loaded even during continuous operation. According to the invention, the drive device for the yarn guide is thermally acceptable for short-term, continuous operation of the drive device in order to achieve maximum acceleration only in the traverse stroke where the reversal point is in the region of the bobbin flank. It is loaded with a motor current corresponding to 3-6 times, preferably 4 times the motor current. In contrast, in a shortened traverse stroke that can be machined by reducing the acceleration of the yarn guide, the motor current supplied to the yarn guide drive is approximately 1.5 times the motor current that is thermally allowed to operate the drive. Double to 2.5 times, preferably double.

  Many traverse strokes carried out during the winding process reduce the acceleration of the yarn guide and correspondingly reduce the loss output of the yarn guide drive, so that the thermal load of the electric motor type drive is reduced. The average value of the loss output, which plays a major role for, is kept at a limit that can be overcome thermally. In the case of using the method of the present invention, it is not necessary to worry about heating of the driving device in the continuous operation even when the yarn guide driving device designed to be relatively small is used.

  In an advantageous embodiment as indicated in claim 2, two acceleration values are adjustable for the yarn guide via a control device. That is, the first maximum acceleration value when the reversing point is operated in a full traverse stroke in the region of the bobbin flank of the traverse bobbin, and the second reduced acceleration when the traverse stroke is shortened The value is adjusted. Such an embodiment is particularly advantageous in that it is relatively simple and thus allows the use of a cost-effective control device.

  In addition to the maximum acceleration value for a full traverse stroke, the control device as claimed in claim 3, for example, a number of acceleration values adapted stepwise to the width of the shortened traverse stroke, for example. The controller is somewhat complicated when configured to work with. Of course, such an advantageous embodiment can be recognized as positive by a more even bobbin structure.

  The optimization of the bobbin structure is achieved by the stepless adjustment of the acceleration value of the yarn guide by the control device (claim 4). In other words, in this case, a stepless adaptation of the yarn guide acceleration is performed in relation to the width of the yarn guide traversing stroke.

  An apparatus according to claim 5 for carrying out the method according to the invention comprises a bobbin frame for holding the bobbin rotatably, a thread guide which can be loaded in an electric motor type, and a thread guide drive device. And a control device for controlled control. In this case, the control device is configured such that maximum acceleration is performed only when a full traverse stroke is to be performed. In contrast, in all other shortened traverse strokes, the supplied motor current is reduced by about half. This has a significant effect on the loss output of the drive. That is, the thermal load of the yarn guide driving device is significantly reduced immediately.

  In a preferred embodiment, the yarn guide is configured as a finger yarn guide and is supported so as to be pivotable about an axis that is substantially perpendicular to the rotational axis of the traverse bobbin.

  In this case, the yarn guide driving device is configured as an electric motor type single driving device. Such finger thread guides have the advantage of being relatively light in weight, and based on the fact that such thread guides are traversed by a single drive of an electric motor type with a frequency of about 30 Hz, Very important.

  The winding device denoted by reference numeral 1 as a whole has a bobbin frame 2 that rotatably holds a traverse bobbin 3. That is, the traverse bobbin 3 is rotatably supported between the bobbin frame arms of the bobbin frame 2 as usual. The traverse bobbin 3 is supported on the driving roller 5 on its surface, and is driven by the driving roller 5 through a frictional connection.

  For this purpose, the driving roller 5 is connected to an electric motor type single driving device 6, and the single driving device 6 itself is connected to the control device 10 via a control lead 21.

  Instead of the drive roller 5 that drives the traverse bobbin 3 by frictional connection, of course, other drive types are conceivable for rotating the traverse bobbin 3. The traverse bobbin 3 can also be driven directly using, for example, a spindle drive device (not shown), that is, a drive device acting on the winding tube tray 21 holding the traverse bobbin. Such a spindle drive is preferably arranged on the bobbin frame 2 at the height of the rotational axis 4 of the traverse bobbin 3.

  A special yarn moving device is provided for traversing the yarn 9 which is not shown in the drawing, preferably unwinding from the spinning cup and running on the traverse bobbin 3.

  The yarn moving device has a yarn guide capable of traversing, for example, a finger yarn guide 7. The finger thread guide 7 is supported so as to be able to turn around a turning axis 20, and is defined by an electric motor type driving device 8, preferably a direct current motor, and can be turned. As can be seen from the drawing, for this purpose, an electric motor type drive 8 is connected to the control 10 via a control lead 11. Furthermore, an angle sensor 23 is attached to the driving device 8. Similarly, the angle sensor 23 is connected to the control device 10 via a signal conductor 24. This means that the traversing width of the travel stroke and the acceleration of the yarn guide 7 can be accurately adjusted and changed at any time via the control device 10 which appropriately controls the drive device 8 of the finger yarn guide 7. The maximum turning distance of the yarn guide 7 during one reciprocating stroke is indicated by R or L.

Operation of the device according to the invention:
2 and 3 schematically show the yarn winding state on the surface of the traverse bobbin 3. In this case, the traverse bobbin is shown in the upper part of the figure.

  FIG. 2 shows the situation in a so-called “full” traverse stroke. That is, the situation in the traverse stroke in which the reversal points 14 are directly located in the region of the bobbin flank 15 of the traverse bobbin 3 is shown. In such a “full” traverse stroke, the yarn guide 7 is accelerated to its maximum from its repetition point 14, respectively. Thus, such “full” traverse strokes each have a relatively short acceleration region 12 as shown in FIG.

  The acceleration region 12 is connected to a central region 13 that is significantly longer than the acceleration region 12. In the central region 13, the speed of the yarn guide 7 is almost constant. In the subsequent deceleration region 22, the thread guide 7 is again decelerated to the speed “zero” by the drive device 8. The speed “zero” is achieved at the second reversal point 14 and is immediately accelerated to a maximum again if, for example, a full traverse stroke is performed.

  In a shortened traverse stroke as shown in FIG. 3, the acceleration of the yarn guide 7 is clearly low and acts very positively on the thermal load of the drive device 8. That is, in the traverse stroke in which the reversal point 14 is positioned with respect to the bobbin flank 15 of the traverse bobbin 3, it is somewhat longer than in the case of maximum acceleration, and consequently the yarn 9 wound around the traverse bobbin 3. Although the acceleration region 12 or the deceleration region 22 that increases the diameter of the reversal circle is generated, the loss output of the drive device 8 that occurs during such reduced acceleration is significantly reduced.

  As described at the beginning, the acceleration of the yarn guide is not only proportional to the motor current supplied to the drive device for the yarn guide, but the loss output generated during the acceleration is simultaneously reduced to 2 of the supplied motor current. As the speed increases in proportion to the power, the decrease in acceleration in the bobbin region, which does not respond very sensitively to the reduced thread guide acceleration, reduces the loss output of such a drive in a relatively simple manner. As a result, the average value of the thermal load of the drive is clearly reduced.

The figure which showed roughly the winding apparatus which implements the method of 2 this invention to the textile machine which manufactures a twill winding bobbin. The figure which showed the thread | yarn winding state with respect to the surface of a traverse winding bobbin in the traverse stroke which has an inversion point in the area | region of the bobbin flank of a traverse winding bobbin. The figure which showed the thread | yarn winding state with respect to the surface of a traverse bobbin in the shortened traverse process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Winding device 2 Bobbin frame 3 Bobbin 4 Rotating axis 5 Drive roller 6 Single drive device 7 Finger yarn guide 8 Electric motor type drive device 9 Thread 10 Controller 11 Control lead 12 Acceleration region 13 Central region 14 Inversion point 15 Bobbin Frank 20 Rotating shaft 21 Winding tube tray 22 Deceleration area 23 Angle sensor 24 Control lead

Claims (6)

A winding device for a textile machine for manufacturing a traverse bobbin, which traverses a bobbin frame for rotatably holding a bobbin and a thread that can be driven by an electric motor and wound around the bobbin during winding Of the type having a yarn guide and a control device which controls the drive device of the yarn guide to allow a defined adjustment of both the width of the yarn guide traversing stroke and the acceleration of the yarn guide In the method of driving,
The yarn guide (7) is accelerated in relation to the traverse stroke width, and the electric motor type drive device (8) of the yarn guide (7) is controlled by the control device (10), and the reversing point ( 14) that the yarn guide (7) is exposed to the maximum acceleration only by the traverse stroke in the region of the bobbin flank (15) of the traverse bobbin (3), that is, the drive device (8) can be moved in a short time. The thread guide is loaded with a motor current that is 3 to 6 times, preferably 4 times the heat current that is thermally allowed for continuous operation of the drive device (8), with a shortened traverse stroke. Performing the reduced acceleration of (7), i.e. the drive device (8) in a short time, 1.5-2.5 times the motor current that is thermally allowed for the drive device (8) continuously. A fiber for producing a traverse bobbin, characterized in that it is preferably loaded with twice the motor current Method of operating a winder of the machine.   Adjusting the two acceleration values for the yarn guide (7) by means of the control device (10), i.e. traversing where the reversal point (14) of the traverse stroke is on the bobbin flank (15) of the traverse bobbin (3) 2. The method according to claim 1, wherein the maximum acceleration value in the stroke and the reduced acceleration value for the shortened traverse stroke are adjusted.   In addition to adjusting the maximum acceleration value in the traverse stroke where the reversal point (14) of the traverse stroke is located on the bobbin flank (15) of the traverse bobbin (3), the control device (10) shortens it step by step. The method according to claim 1, further comprising adjusting a reduced acceleration value adapted to the width of the traversing stroke made.   2. The method according to claim 1, wherein the control device (10) performs stepless adjustment of the acceleration value in relation to the traverse stroke.   2. A device for carrying out the method according to claim 1, wherein the thread guide (7) has an electric motor drive (8), the drive (8) being connected via a control device (10). The yarn guide (7) is exposed to maximum acceleration and shortened in the traverse stroke in which the yarn guide (7) is only in the traverse stroke in the traverse bobbin (3) bobbin flank (15) region. A device for operating a winding device of a textile machine for producing a traverse bobbin, characterized in that the acceleration is clearly reduced with respect to the maximum acceleration.   The yarn guide is configured as a finger yarn guide (7), and the yarn guide (7) pivots about an axis (20) that is substantially perpendicular to the rotational axis (4) of the drivable traverse bobbin (3). 6. The device as claimed in claim 5, wherein the device is supported in such a way that the finger thread guide (7) can be loaded by a single drive (8) of the electric motor type.

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