WO2007006475A1

WO2007006475A1 - Apparatus for reeling yarns

Info

Publication number: WO2007006475A1
Application number: PCT/EP2006/006587
Authority: WO
Inventors: Davide Maccabruni; Louis Gubser; Göksel Karaarslan
Original assignee: SSM Schärer Schweiter Mettler AG
Priority date: 2005-07-08
Filing date: 2006-07-06
Publication date: 2007-01-18
Also published as: EP1741655A1; CN101247997A; EP1910204A1

Abstract

Disclosed is an apparatus (1) for reeling yarn (17), comprising a bobbin receptacle that is mounted so as to be rotatable about the longitudinal axis thereof and is designed for accommodating a bobbin (3, 4), a pressure roll (15) for supporting the bobbin (3, 4) located in the bobbin receptacle, a pressure lever arm (6, 7) which is rotatably fixed to a fulcrum (10) in the region of the radially inward end thereof, and an active actuator (12) for twisting the pressure lever arm (6, 7) about the fulcrum (10). The bobbin receptacle is disposed at an outer end of the pressure lever arm (6, 7) so as to be rotatable perpendicular to the pressure lever arm (6, 7). The actuator (12) is provided with an electric motor (20) encompassing a sensorless motor controller. Said motor controller is designed so as to regulate a torque that is to be applied to the pressure lever arm (6, 7) by the electric motor (20) according to a predefined torque curve.

Description

Device for winding yarns

The invention relates to a device for winding yarns (winding device) with a yarn carrier receptacle rotatably mounted about its longitudinal axis, adapted for receiving a yarn carrier, a pressure roller, adapted for supporting a yarn carrier arranged in the yarn carrier receptacle, a pressure lever arm which is in the region of its radially inner end is rotatably mounted at a pivot point, and an active actuator, arranged for rotating the Anpresshebelarms about the pivot point, wherein the Garnträgeraufnahme is rotatably disposed at an outer end of the Anpresshebelarms perpendicular to the Anpresshebelarm. Such winding devices are used in winding processes, in particular rewinding processes, in yarn production, e.g. used for the production of bobbins with yarn windings adapted to a subsequent process.

Winding devices are part of yarn making machines. The yarn is spooled by the winders onto a yarn carrier, eg an empty tube, to obtain a yarn package having a desired size, shape and / or density. The yarn carrier is either rotated by contact with a driven pressure roller for winding the yarn in rotation, or driven directly, with a pressure roller for supporting the yarn carrier is necessary. The weight of the yarn carrier together with the weight of the Anpresshebelarms torque is exerted about the pivot point of the Anpresshebelarms, whereby a contact force of the yarn carrier is produced on the pressure roller. This contact force increases with increasing weight of the yarn carrier during the winding of a yarn on the yarn carrier. The contact pressure is the cause responsible for the quality of yarn spooling on the finished bobbin. The stronger the contact force during winding, the harder is the winding of the yarn on the yarn carrier, ie, the greater the winding density of the yarn on the yarn carrier. Any fluctuation of the contact force leads to an irregularity of the winding density, which can lead to yarn breaks or quality fluctuations, eg color irregularities in dyeing processes in subsequent processes in which the yarn package serves as a supply spool. Regardless of the drive of the yarn carrier therefore a controlled contact force as possible between the yarn carrier and the pressure roller must be generated. In most Aufspulprozessen the contact pressure should be definable according to a predetermined Anpresskraftverlauf from the beginning of the Aufspulprozesses to its end, for example, according to a constant course. For special yarn processing processes, eg when dyeing polyamide (PA) yarns, the contact force should gradually decrease towards the end of the winding process. At the beginning of the winding process, the contact pressure is only generated by the weight of the Anpresshebelarms and possibly attached thereto other elements and the empty yarn carrier. When the value of a desired contact force is higher than the force generated by the weight, the actuator provides the missing force (actuator force) for generating the desired value. The latter is often necessary at the beginning of the winding process in a so-called loading phase. During winding, the weight of the yarn carrier increases by the weight of the yarn wound thereon. In order to keep the contact pressure constant, the actuator must continuously spend correspondingly less actuator force. If, for example, towards the end of the winding process, the weight becomes too large, the actuator in a release phase must press the Anpresshebelarm against gravity in the opposite direction of the original actuator force to reduce the contact pressure by a portion of the weight. As the diameter of the yarn package increases with yarns being wound thereon, it may further be necessary for the actuator to raise the pressure lever arm to a higher position raises to avoid over-squeezing the bobbin. The actuator force to be expended by the actuator thus varies continuously, in accordance with the actual weight of the yarn package, which increases quadratically with its diameter in order to keep the contact pressure constant, for example. The actuator is usually designed as a mechanical component, for example with one or two pneumatic cylinders, wherein the actuator is attached to the Anpresshebelarm such that it directly exerts the Aktuatorkraft on the Anpresshebelarm. In this case, the contact force is provided by exerting a torque about the pivot point of the Anpresshebelarms, or by directly exerting Aktuatorkraft on the Anpresshebelarm. Regardless of how the Aktuatorkraft is transmitted to generate the contact pressure, a direct force measurement and / or an indirect force measurement, for example via the position of the Anpresshebelarms, necessary to regulate the torque, or the contact force. The contact force is measured by means of a sensor and the output signal of the sensor is used as a controlled variable for controlling the actuator. In an indirect force measurement can be concluded, for example, from the position of the Anpresshebelarms on the diameter of the yarn package and thus with known yarn weight on the weight of the yarn package. A disadvantage of known winding devices is that the structure of the winding device is complicated and expensive by the need for controlling the contact force sensor. The measurement of the contact pressure is more error-prone and inaccurate.

The invention is based on the object, a device for winding of

To provide yarns which avoids the disadvantages of the prior art and in particular allows accurate and safe torque control of the actuator. This object is achieved by the device of the independent claim. The dependent claims represent preferred embodiments of the invention.

In a winding device according to the invention, the actuator has an electric motor with a sensorless motor control, wherein the motor control is set to regulate a torque which is to be exerted by the electric motor on the Anpresshebelarm, according to a predetermined torque curve. In particular, there is no optical and / or electromagnetic sensor for detecting the torque exerted by the actuator.

Such motors are known from the prior art. These are, for example, brushless, in particular direct current, motors, linear motors or stepping, for example hybrid stepping motors, which can control the position of their motor axis and the torque applied by the motor axis by means of their motor control itself. Examples of such motors are disclosed in the publications WO 2004/036732 A1, WO 02/078152 A1 and / or WO 03/036787 A1. The winding device according to the invention allows an efficient and precise control of the contact pressure, with a simplification of the entire arrangement of the winding device by eliminating any kind of sensors in the field of the winding device. In addition, the manufacturing cost and the spatial dimension of the winding device are reduced. The accuracy of the control of the contact force is increased compared to the prior art, during the entire Aufspulprozesses the desired torque curve can be accurately and actively controlled. There is no so-called stick-slip effect, ie even small changes in the position of the actuator can be set accurately even at very low speed. The motor axis can be accurately positioned in the case of its execution as a rotation axis (motor shaft), for example, to a sixteenth turn. The electric motor can be full even at standstill Provide torque. The absolute position of the motor axis is known at all times, which allows an exact forward and backward movement of the motor axis.

The motor is particularly preferably a synchronous motor with permanent magnet with a motor control according to the document DE 698 05 641 T2. The command control by the motor control of the permanent magnet synchronous motor without a direct sensor, that is to say without a probe based on the Hall effect or an optical transmitter, comprises the following working steps, wherein the synchronous motor has at least one phase, one winding and one rotor:

- control of the power supply of each motor phase,

simultaneous measurement of the voltage of all motor phases,

Determination of a variable frequency based on the speed and the motor load. According to the variable frequency pointwise measurement of output signals from the voltage measurement of the phases, and

- Control of the phase supply depending on the extracted signals.

The engine control is preferably set up to adjust the product from the value of the electric current flowing through the electric motor and the voltage applied to the electric motor for controlling the torque. By changing this product can be directly closed to the torque currently applied by the electric motor, the motor control can be constructed only of components of an electrical circuit. There is also no additional wiring of the electric motor necessary.

The pressure roller may be advantageously configured to drive the rotation of the yarn carrier receptacle via the yarn carrier. This has the advantage over the possibility of a direct drive of the Garnträgeraufnahme that the Press roller has a fixed position on a yarn processing machine, that is mounted fixed in position, so that a very simple structure is possible to drive the pressure roller.

Preferably, means are provided for determining the yarn carrier weight, wherein the motor controller is adapted to control the torque of the electric motor such that the sum of the force exerted by the electric motor on the Anpresshebelarm torque and the yarn carrier weight on the Anpresshebelarm torque applied to the predetermined torque curve, or a predetermined contact force, corresponds, is preferably kept constant. This achieves a uniform density of the yarn wound on the yarn carrier. The yarn package thus created is particularly well suited as a supply spool for subsequent processes.

The means for determining the yarn carrier weight are preferably set up to determine a rotational speed of the yarn carrier receptacle and to determine the yarn carrier weight via the rotational speed. The rotational speed of the yarn carrier recording already contains the information about the current diameter of the yarn carrier with the yarn wound thereon. The tangential velocity of the pressure roller is equal to

Tangential velocity of the surface of the wound yarn on the yarn carrier. As the yarn carrier becomes thicker as the yarn is wound up, its circumference becomes larger and larger. For the same tangential velocity of the surface, therefore, the rotational speed of the yarn carrier receptacle must decrease. The current value of the rotational speed of the yarn carrier recording is therefore directly proportional to the actual diameter of the yarn carrier with the yarn wound thereon, ie the yarn package, at a constant rotational speed of the pressure roller. This diameter information can be passed to the motor control for controlling the contact pressure. About predefined Tables in a control software of the engine control can be calculated from the current diameter of a current assumed weight of the yarn package. This assumed weight is very accurate, although a measured yarn length of the yarn unwound at the beginning of the yarn production process and the yarn weight per length are included in the calculation. According to the current presumed weight, a desired value for the torque of the electric motor to be expended, in accordance with the predetermined torque curve, is determined. The electric motor then holds its position and the torque to be applied until a new yarn package diameter has been calculated over the rotational speed of the yarn carrier holder and a new torque to be applied and a new one

Position was determined. This process is repeated in a control loop during the entire winding process. It is important in particular with DTY (Draw-Texture-Yarn) yarns that the length of the yarn wound on the yarn package is highly dependent on the tension of the yarn, i. the tension of the yarn must be adjusted according to the length of the yarn wound on the yarn package.

A particularly compact design of the winding device according to the invention is achieved in that the actuator has a worm gear, wherein the worm gear at the pivot point of the Anpresshebelarms with the Anpresshebelarm comes into engagement and the torque of the electric motor for rotating the Anpresshebelarms on the worm gear on the Anpresshebelarm is transferable. The torque applied by the worm gear is transmitted, for example via a gear which is fixed to the Anpresshebelarm and is rotatably mounted with its center at the pivot point of the Anpresshebelarms on the Anpresshebelarm. This torque can be controlled directly by the engine control. Alternatively, the actuator may include torque transmitting means, wherein preferably the torque transmitting means between the outer and inner ends of the Anpresshebelarms, preferably centrally, with the Anpresshebelarm engage and the torque of the electric motor for rotating the Anpresshebelarms on the torque transmitting means on the

Anpresshebelarm is transferable. The torque transmitting means, e.g. a belt can also be fixed at the end of the Anpresshebelarms. This configuration has the advantage that the lever arm for transmitting the torque from the electric motor, or a force applied by the electric motor, on the Anpresshebelarm is cheaper. That the force to be expended by the electric motor is less for the same torque to be applied because a lever acts through the distance between the pivot point of the pressure lever arm and the position where the torque transmitting means engages the pressure lever arm.

The torque transmission means may comprise a belt, preferably a toothed belt, or a screw spindle, which are drivable by the electric motor. For this purpose, the electric motor can be designed as an electric motor with a rotatable motor axis in the usual way. The rotational movement of the motor axis is converted into a tensile or compressive movement. The torque exerted by the rotatable motor axis is controlled.

When the torque transmitting means is designed as an axis of a linear motor, the force exerted by the axis multiplied by the distance between the pivot point of the Anpresshebelarms and the position at which the axis comes into engagement with the Anpresshebelarm, corresponds to the torque to be controlled. It must then be implemented no rotational movement of a motor axis in a tensile or compressive movement. A yarn processing machine according to the invention has at least one winding device according to the invention.

The invention will be explained in more detail by means of embodiments with reference to the drawings.

FIG. 1 shows a first embodiment of a device according to the invention

Winding device with a worm gear.

FIG. 2 shows a further embodiment of a rewinding device according to the invention with a belt as torque transmission means.

FIG. 3 shows a further embodiment of a device according to the invention

Winding device with a screw as a torque transmitting means.

FIG. 4 shows a further embodiment of a device according to the invention

Winding device, wherein the torque transmission means are designed as an axis of a linear motor.

The figures of the drawings show the subject matter of the invention in a highly schematic manner and are not to scale. The individual components of the article according to the invention are shown so that their structure can be well shown.

FIGS. 1 to 4 each show a winding device 1 according to the invention. A yarn carrier 3, 4 is arranged in a yarn carrier receptacle mounted rotatably about its longitudinal axis. An Anpresshebelarm 6.7 is rotatably mounted in the region of its radially inner end at a pivot point The Anpresshebelarm 6.7 is rotatable by means of an active actuator 12 about the pivot point 10, that is pivotable. The Garnträgeraufnahme is arranged rotatably at an outer end of the Anpresshebelarms 6,7 perpendicular to Anpresshebelarm 6,7. A pressure roller 15 supports the arranged in the Garnträgeraufnahme yarn carrier 3.4 off. In this case, the pressure roller 15 takes on the weight of the Anpresshebelarms 6.7 Garnträgeraufnahme and the yarn carrier 3.4 with yarn wound thereon 17 and the given case by the actuator 12 on the Anpresshebelarm 6.7 torque exerted generated pressing force F, represented by an arrow , on. The pressure roller 15 can be driven by means of an electric motor, not shown. The yarn 17 is guided over a yarn guide 18, for example a laying, between the pressure roller 15 and the yarn carrier 3, 4. The actuator 12 has an electric motor 20 with a sensorless motor control. The engine controller is configured to control a torque to be applied by the electric motor 20 to the Anpresshebelarm 6,7, according to a predetermined torque curve.

The Anpresshebelarm 6,7 is shown in two positions. The arranged in the Garnträgeraufnahme yarn carrier 4 of the Anpresshebelarms 7 in the first position at the beginning of Aufspulprozesses is still empty. In the Anpresshebelarm 6 in the second position, the yarn carrier 3 is full, i. on the yarn carrier 3, the yarn 17 is wound to form a yarn package.

FIG. 1 shows a rewinding device 1 according to the invention with an actuator 12 which has a worm gear 25. The worm gear 25 is driven directly by the motor axis of the electric motor 20. The

Worm gear 25 comes at the pivot point 10 of the Anpresshebelarms 6.7 with the Anpresshebelarm 6.7 for engagement and the torque T of the electric motor 20 for rotating the Anpresshebelarms 6.7 is transmitted via the worm gear 25 to the Anpresshebelarm 6.7. The torque T applied by the worm gear 25 is transmitted to the pressure lever arm 6, 7 via a toothed wheel 26, which is fastened to the pressure lever arm 6, 7 and is rotatably mounted with its center at the pivot point 10 of the pressure lever arm 6, 7. The Garnträgeraufnahme is rotatably disposed at the outer end of the Anpresshebelarms perpendicular to Anpresshebelarm. FIG. 2 shows a further embodiment of a rewinding device 1 according to the invention with an actuator 12 which has a belt 30 as a torque transmission means. The belt 30 passes around the motor axis of the electric motor 20 and a pulley 32 fixed to a yarn processing machine. The belt 30 engages centrally between the outer and inner ends of the Anpresshebelarms 6.7 via a belt 34 attached to the Anpresshebelarm 6.7, or in the case of a toothed belt via a gear with the Anpresshebelarm 6.7 for engagement. The torque T, represented by two bent arrows, of the electric motor 20 for rotating the Anpresshebelarms 6.7 is thereby transmitted via the belt 30 on the Anpresshebelarm 6.7.

FIG. 3 shows a further embodiment of a rewinding device 1 according to the invention with an actuator 12, which has a screw spindle 40 as torque transmission means. The screw 40 is designed as an extension of the motor axis of the electric motor 20. The screw spindle 40 comes centrally between the outer and the inner end of the Anpresshebelarms 6.7 via a arranged on the Anpresshebelarm 6.7 nut thread 42 with the Anpresshebelarm 6.7 for engagement. The electric motor 20 is pivotable in an advantageous manner to a motor attachment 44 a

Garnbearbeitungsmaschine fixed. In the figure, this pivotability is indicated by the double representation of the electric motor 20. The torque T ₁ represented by two curved arrows, the electric motor 20 for rotating the Anpresshebelarms 6.7 is thereby transmitted via the screw 40 to the Anpresshebelarm 6.7.

FIG. 4 shows a further embodiment of a rewinding device 1 according to the invention with an actuator 12 whose electric motor 20 is designed as a linear motor with an axis 50 of the linear motor Torque transmission means. The axis 50 of the linear motor is centered between the outer and the inner end of the Anpresshebelarms 6.7 with the Anpresshebelarm 6.7 for engagement. For this purpose, the axis 50 is pivotally mounted in the region of its remote end on the Anpresshebelarm 6.7. The linear motor is also advantageously pivotable on a

Fixed motor mount 44 of a yarn processing machine. In the figure, this pivotability is indicated by the double representation of the linear motor. The linear motor exerts a force P, represented by a double arrow, on its axis 50 on the Anpresshebelarm 6.7. The torque transmitted by the electric motor 20 for rotating the Anpresshebelarms 6.7 on the Anpresshebelarm 6.7 corresponds to the force P, which is exerted by the axis 50 multiplied by the distance between the pivot point 10 of the Anpresshebelarms 6,7 and the position at the axis 50 comes with the Anpresshebelarm 6.7 for engagement.

Proposed is a winding device 1 for winding yarn 17 with a rotatably mounted about its longitudinal axis yarn carrier receptacle, adapted for receiving a yarn carrier 3,4, a pressure roller 15, arranged for supporting the arranged in the Garnträgeraufnahme Gamträgers 3.4, a Anpresshebelarm 6.7 which is rotatably mounted at a pivot point 10 in the region of its radially inner end, and an active actuator 12 adapted to rotate the Anpresshebelarms 6.7 about the pivot point 10, wherein the Garnträgeraufnahme at an outer end of the Anpresshebelarms 6,7 perpendicular to the Anpresshebelarm 6,7 is arranged rotatable. The actuator 12 has an electric motor 20 with a sensorless motor control, wherein the

Set up motor control, a torque to be exerted by the electric motor 20 on the Anpresshebelarm 6,7 to regulate according to a predetermined torque curve. The invention is not limited to the embodiments given above. Rather, a number of variants are conceivable, which make use of the features of the invention even with fundamentally different type of execution.

Claims

claims

1. Winding device (1) for winding up yarn (17) with - a yarn carrier receptacle rotatably mounted about its longitudinal axis and configured to receive a yarn carrier (3, 4),

- A pressure roller (15), adapted for supporting the arranged in the Garnträgeraufnahme yarn carrier (3,4),

- A Anpresshebelarm (6,7) which is rotatably mounted in the region of its radially inner end at a pivot point (10), and

- An active actuator (12), arranged for rotating the Anpresshebelarms (6,7) about the pivot point (10), wherein

- The Garnträgeraufnahme at an outer end of the Anpresshebelarms (6,7) angled to the Anpresshebelarm (6,7) rotatably disposed, characterized in that the actuator (12) comprises an electric motor (20) with a sensorless motor control, wherein the engine control set , a torque to be exerted by the electric motor (20) on the Anpresshebelarm (6,7), according to a predetermined torque curve to regulate.

2. Winding device according to claim 1, characterized in that the motor control is set up, the product of the value of the electric motor (20) flowing through the electric current and the electric motor (20) voltage applied to the control of

Adjust torque.

3. Winding device according to at least one of claims 1 to 2, characterized in that the pressure roller (15) is arranged for driving the rotation of the Garnträgeraufnahme on the yarn carrier (3,4).

4. Winding device according to at least one of claims 1 to 3, characterized in that

Means are provided for determining the Garnträgergewicht, wherein the engine control is configured to control the torque of the electric motor (20) such that the sum of the electric motor (20) on the Anpresshebelarm (6,7) and the applied torque of the Garnträgergewicht on the Anpresshebelarm (6.7) applied torque corresponds to the predetermined torque curve, preferably kept constant.

5. Winding device according to claim 4, characterized in that the means for determining the Garnträgergewichts are adapted to determine a rotational speed of the Gamträgeraufnahme and the

To determine yarn carrier weight over the rotational speed.

6. Winding device according to at least one of claims 1 to 5, characterized in that the actuator (12) has a worm gear (25), wherein the

Worm gear (25) at the pivot point (10) of the Anpresshebelarms (6,7) with the Anpresshebelarm (6,7) comes into engagement and the torque of the electric motor (20) for rotating the Anpresshebelarms (6,7) via the worm gear (25) on the Anpresshebelarm (6,7) is transferable.

7. Winding device according to at least one of claims 1 to 5, characterized in that the actuator (12) has torque transmitting means, wherein the

Torque transmission means, preferably between the outer and the inner end of the Anpresshebelarms (6,7), preferably centrally, with the Anpresshebelarm (6,7) engage and the torque of the electric motor (20) for rotating the Anpresshebelarms (6,7) via the torque transmitting means is transferable to the Anpresshebelarm (6,7).

8. Winding device according to claim 7, characterized in that the torque transmission means a belt (30), preferably one

Timing belt, which can be driven by the electric motor (20).

9. Winding device according to claim 7, characterized in that the torque transmission means comprises a screw spindle (40) which is drivable by the electric motor (20).

10. Winding device according to claim 7, characterized in that the electric motor (20) is designed as a linear motor, wherein the

Torque transmission means are designed as an axis (50) of the linear motor.

1. yarn processing machine with at least one winding device (1) according to at least one of the preceding claims.