JP2016535713A - Godet and method for controlling godet - Google Patents

Abstract

The present invention relates to a godet for guiding a yarn, a method for controlling a godet, and a method for operating a godet. The godet and the method use the godet peripheral wall (1) of the godet driven by the electric drive unit (2), and after the operation is interrupted, the electric drive unit is rotated by the rotational movement of the manually formed godet peripheral wall (1). (2) is restarted. It is possible to activate the electric drive without using additional auxiliary means after the interruption of operation.

Description

  The present invention is a godet for guiding a yarn described in the superordinate concept of claim 1, a method for controlling a godet described in the superordinate concept of claim 10, and a superordinate concept of claim 16. And a method of operating a godet.

  During yarn production and processing, the yarn is generally guided to be partially wrapped around the rotating godet circumferential wall one or more times for guidance, feeding or drawing. Known. Such a godet ensures the transport of yarn in a textile machine or manufacturing process. For example, in a texturing process for drawing or false twisting, untreated yarn is prepared as a supply package and guided inside a texturing machine by a plurality of godets arranged back and forth within the processing location. Each yarn is drawn and textured at the processing location, and then wound into a single package.

  Such a godet and a method for controlling the godet are known, for example, from WO 2007/134732.

  Known godets have a drivable godet peripheral wall coupled to an electric drive for guiding the yarn. The yarn is guided around the driven godet peripheral wall. Here, for example, when the package is exchanged in the downstream winding device, there is a risk that thread loosening or erroneous supply may occur, or on the contrary, thread breakage may occur in the processing location. In addition, such a change in yarn tension during yarn guidance may cause undesirable yarn winding on the driven godet peripheral wall. In order to shorten the interruption time as much as possible, in known godets, the yarn guiding situation of the godet peripheral wall is monitored by a winding sensor, allowing the electric drive to be switched off quickly. After the winding around the godet peripheral wall is removed, the winding sensor is moved to its initial position, whereby the voltage supply to the interrupted electric drive unit is performed again and the electric drive unit is restarted. Is possible. In this case, the winding sensor can be directly used as a switch for restarting the electric drive unit.

  However, in the prior art, godets in which the electric drive is activated by a separate switch are also generally known. Regardless of whether or not the switch has an additional function for winding monitoring, troublesome wiring is required between the switch and the electric drive unit. The switch is operated by an operator, and after the operation is interrupted, the operator again hangs a thread around the godet.

  Accordingly, an object of the present invention is to improve the godet of the form described in the superordinate concept and the method of controlling the godet of the form described in the superordinate concept, and add activation of the godet electric drive unit after the operation is interrupted. It is possible to use without using auxiliary means.

  Another object of the present invention is to provide a method for operating a godet in a textile machine that is particularly adapted to the process sequence and its requirements.

  The problem is solved by a godet having the features of claim 1, a method for controlling a godet having the features of claim 10, and a method of operating a godet having the features of claim 16. Is done.

  Advantageous developments of the invention are defined by the features described above and combinations of these features.

  The present invention is based on the recognition that the godet of a textile machine used for yarn guidance has a relatively low mass godet peripheral wall, and this godet peripheral wall has a relatively small mass moment of inertia. Therefore, it is possible to manually form the rotational movement of the godet on the godet peripheral wall without using auxiliary means by the operator. After the operation is interrupted, it is common for an operator to manually hang the thread again using a suction gun and introduce the thread from the end face of the godet peripheral wall. It is possible to cause a rotational movement. The rotational motion manually formed on the godet peripheral wall is transmitted into the electric drive and can be detected and used for a corresponding restart. In this case, no additional switch means for activating the electric drive is necessary.

  In order to generate a signal that can be detected directly in the electric drive by the rotational movement of the godet peripheral wall, the godet according to the invention is preferably configured by a brushless synchronous motor in which the control electronics are incorporated. The godet peripheral wall is fixedly connected to the motor shaft of the synchronous motor. Therefore, the motor shaft in the synchronous motor is driven by the rotation of the godet peripheral wall. Thus, a signal that can be directly electrically evaluated can be generated by magnetic coupling between the stator and the rotor in the synchronous motor.

  As a measurable signal, an induced voltage or an induced motor current can be used. In this case, according to a development of the invention, the control electronics advantageously have a voltage measuring device for detecting the induced voltage and an evaluation unit for generating a starting signal. In an alternative embodiment, the control electronics is provided with a current measuring device for detecting the motor current, and the evaluation unit generates a corresponding start signal from the current measurement.

  However, in particular, when the godet is manipulated when removing unwanted winding around the godet peripheral wall, an unintended rotational motion is generated in the godet peripheral wall. In order to prevent the electric drive from being restarted prematurely in the event of such undesired rotational movement of the godet peripheral wall, preferably according to a development of the godet according to the present invention, the evaluation unit comprises a synchronization unit. A differential operator for determining the angular acceleration of the motor shaft of the motor; The increasing speed of current change or voltage change is proportional to the angular acceleration of the motor shaft. The restart can be performed only when the angular acceleration of the motor shaft is sufficient.

  Thus, the evaluation unit has a comparator for comparing the actual value of the angular acceleration with a stored threshold value. This eliminates signal formation in the electric drive due to undesired rotational movement of the godet peripheral wall.

  In order to avoid overloading of the electric drive during the operation of the godet, according to a development of the invention, friction means are assigned to the godet peripheral wall with a small spacing, said friction means being a godet peripheral wall The electric drive unit has an operating torque monitoring unit in the friction means. Therefore, when the thread winding occurs around the godet peripheral wall, the operating torque of the electric drive unit can be increased dramatically, thereby enabling a quick switch-off to avoid overload.

  In order to increase the yarn tension, the yarn is guided so that it is preferably wound a plurality of times around the periphery of the godet. In this regard, according to the development of the godet according to the present invention, the godet peripheral wall cooperates with a roller supported so as to be capable of relative rotation in order to guide the yarn in a state where it is wound a plurality of times.

  Further, in a textile machine, a large number of processing points are arranged next to each other, and a plurality of godets are usually controlled together as a group at the start and end of a process. In this case, it is advantageous to assign a manual switch for starting and stopping the godet wall to the electric drive.

  The godet according to the present invention is basically suitable for guiding a plurality of yarns simultaneously around one godet peripheral wall. In this case, it is important that the godet peripheral wall coupled to the electric drive unit can be manually rotated.

  The method for controlling a godet according to the present invention is excellent in that the switch control does not have to be adjusted to activate the electric drive. On the contrary, it is possible to restart the drive unit of the godet peripheral wall directly by manually forming the rotational movement of the godet peripheral wall.

  In order to be able to carry out the starting process automatically without the use of additional auxiliary means, the godet peripheral wall is driven by a brushless synchronous motor drive shaft incorporating control electronics. Such BLDC motors are particularly suitable for enabling the control algorithm to be implemented directly in the electric drive.

  Thus, the current or voltage of the synchronous motor during the rotational movement of the motor shaft can be measured and a start signal can be generated in the control electronics directly from the measured value.

  In particular, in order to eliminate, for restarting, an undesired rotational movement of the godet peripheral wall that may be formed, for example, when an operator unwinds the thread, the synchronous motor preferably is rotated during the rotational movement of the motor shaft. A time increase in current and / or a time increase in voltage is measured and then a start signal is generated in the control electronics from the measured value.

  It has been found that the rate of increase of the current or voltage induced by the manually formed rotational motion is proportional to the angular acceleration of the motor shaft. Therefore, the angular acceleration of the motor shaft can be obtained from the increasing speed of the current change or voltage change, and the start signal can be generated from the angular acceleration based on the comparison between the actual value of the angular acceleration and the threshold value.

  The method of controlling the godet can be further improved by continuously monitoring the operating torque of the electric drive, especially for switching off the electric drive. Thereby, when a predetermined limit operating torque is exceeded, it is possible to realize the switch-off of the electric drive unit without using another auxiliary means.

  The method of operating a godet in a textile machine according to the present invention is excellent in that all operations to be performed after yarn breakage in the godet are directly related to the godet peripheral wall. Therefore, threading around the godet peripheral wall and restart of the godet peripheral wall are necessary. Thus, all substantial operations can be performed directly by the operator on the godet wall. The operator manually forms the rotational movement of the godet peripheral wall to restart the drive. In this regard, the godet peripheral wall can be guided to rotate by quickly moving the hand in the circumferential direction of the godet peripheral wall. The godet peripheral wall performs a continuous rotational motion with multiple rotations during rotation. In this case, the operator preferably accelerates the godet peripheral wall in the direction of rotation by placing the hand flat on the peripheral surface of the godet peripheral wall while applying a slight force, and then quickly moving the hand aside. it can.

  The rotational movement can preferably be formed both in the motor rotation direction and in the opposite direction to the motor rotation direction, and the godet peripheral wall is driven by a brushless synchronous motor incorporating control electronics. In this case, it is not important for signal formation in which direction of rotation of the motor shaft the signal induction is performed.

  In particular, in the case where a plurality of godets are provided, a switch which can be operated manually by one electric drive unit is able to carry out the start and end of the process irrespective of their respective operating states. Is started and stopped by. Such a switch can be configured as a group switch for controlling a plurality of godets or as an individual switch for controlling individual godets.

  The invention will now be described in more detail on the basis of several embodiments of the device according to the invention with reference to the accompanying drawings.

1 is a schematic cross-sectional view of one embodiment of a godet according to the present invention. Fig. 2 is a schematic side view of the embodiment of Fig. 1 in a plurality of different operating situations in a textile machine. It is a schematic flowchart for producing | generating the starting signal of an electric drive part. It is the schematic of the signal transition of the measurement signal of an electric drive part when a rotational motion is formed manually. It is a schematic side view of another one Example of the godet which concerns on this invention.

  FIG. 1 shows a cross-sectional view of one embodiment of a godet according to the present invention. The godet has a cup-shaped godet peripheral wall 1. The godet peripheral wall 1 is fixed to the protruding free end of the motor shaft 3 of the electric drive unit 2 so as not to be relatively rotatable. In this embodiment, the electric drive unit 2 is configured as a brushless synchronous motor 4 also known as a so-called BLDC motor. Accordingly, the electric drive unit 2 includes the synchronous motor 4 and the control electronic device 5 incorporated therein.

  The electric drive part 2 and the godet peripheral wall 1 are comprised as one structural unit, and the electric drive part 2 has the housing which consists of several parts. The motor shaft 3 of the synchronous motor 2 is supported in a bearing housing 8 through a plurality of rolling bearings 9 so as to be relatively rotatable. The motor shaft 3 has an end portion on which the rotor 10 is disposed on the side opposite to the godet peripheral wall 1. The rotor 10 is formed by a permanent magnet that will not be described in detail herein. The rotor 10 is surrounded by a stator 11 that supports a plurality of windings. The stator 11 is held by a motor support portion 12. The motor support 12 extends between the motor housing 13 disposed so as to be in direct contact with the synchronous motor 4 and the bearing housing 8. The motor housing 13 accommodates the control electronic device 5. The motor housing 13 and the bearing housing 8 are connected to each other via a plurality of holding webs 31.

  In this embodiment, the control electronic device 5 is symbolically represented by the printed circuit board 14, the power module 15, the inverter 17, and the evaluation unit 19. The control electronics 5 have, inter alia, measuring means 16, which are generally coupled to the evaluation device 19. Furthermore, a memory means 18 is provided, which is generally incorporated in the evaluation unit 19. Therefore, the memory means 18 and the evaluation unit 19 can be configured as one microprocessor.

  The control electronics 5 is coupled to a voltage source (not shown) via a feeder line 21. The second connection to the control electronics 5 is the data line 20, which allows data exchange with the host machine control unit 22. Furthermore, in this embodiment, a switch 23 is directly coupled to the control electronics 5 in order to enable activation of the electric drive 2 at the start of the process or at the end of the process.

  In the following, the function of the godet illustrated in FIG. 1 will be described with reference to further drawings 2.1, 2.2, 2.3. FIGS. 2.1, 2.2 and 2.3 show an overview of the embodiment of FIG. 1 when used in a textile machine. Fig. 2.1 shows the godet in operation with yarn guide, Fig. 2.2 shows the godet in operation when yarn winding occurs, and Fig. 2.3 shows The godet when the electric drive unit 2 is restarted is illustrated.

  A godet according to FIG. 1 is held on a support 27 inside the textile machine. Here, the godet peripheral wall 1 is held on the front side of the support 27, and the electric drive unit 2 is held on the back side of the support 27. On the front side of the support body 27, a roller 28 that is supported so as to be rotatable relative to the godet peripheral wall 1 is assigned. Friction means 24 is further fixed on the front side of the support 27, and the friction surface 26 of the friction means 24 is held on the godet peripheral wall 1 at a small interval. The friction means 24 is constituted by a pin 25 fixed to the support body 27 in this embodiment, and this pin 25 is oriented coaxially with the godet peripheral wall 1 and extends over almost the entire length of the godet peripheral wall 1. doing.

  FIG. 2.1 shows a situation in which the yarn 29 is guided so as to be wound around the periphery of the godet peripheral wall 1 and the periphery of the roller 28 a plurality of times. In this operating state, the godet peripheral wall 1 is driven by the synchronous motor 4 at a substantially constant rotational speed. The synchronous motor 4 is controlled by the control electronic device 5, and at this time, the target rotational speed is input to the control electronic device 5 via the data input unit.

  When thread winding is formed around the godet peripheral wall 1 due to yarn breakage before or behind the godet or slack of thread before or behind the godet, the tension of the yarn on the godet peripheral wall 1 is increased each time. As a result, the operating torque of the synchronous motor 4 changes. This situation is illustrated in FIG. 2.2, where a thread winding 30 is generated around the godet peripheral wall 1 by winding the traveling thread 29. Alternatively, there is a possibility that the yarn winding 30 is generated by the yarn that has already traveled and the returned yarn is guided to the yarn winding 30.

  Regardless of the type of occurrence of the thread winding 30 around the godet peripheral wall 1, the control electronic device 5 detects a change in the actual value of the operating torque in each case and compares it with the stored limit value of the operating torque of the synchronous motor 4. Is done. As soon as the yarn winding 30 contacts the friction means 24, an additional operating torque is formed via the friction surface 26, which causes a very rapid increase in the operating torque of the synchronous motor 4. As soon as an unacceptable excessive increase in the operating torque is confirmed, a switching signal for switching off the synchronous motor 4 is generated in the evaluation unit 19 of the control electronics 5. The motor shaft 3 coupled to the godet peripheral wall 1 is stopped, so that the operator can remove the thread winding 30 around the godet peripheral wall 1.

  FIG. 2.3 shows the situation immediately before the end of the operation interruption. In this situation, the operator guides the thread 29 to the hand injector 32 and hangs the thread around the godet peripheral wall 1. The godet peripheral wall 1 is rotated in advance by the operator moving his / her hand. For this purpose, a hand is applied to the peripheral surface of the godet peripheral wall 1, whereby the operator quickly moves the hand in the rotation direction to accelerate the rotation of the godet peripheral wall 1. The godet peripheral wall 1 rotates with the motor shaft 3, whereby a signal is induced via the rotor 10 in the synchronous motor 4.

  To further explain the starting process of the electric drive 2, reference is made to FIG. FIG. 3 shows a flowchart for generating a start signal for the synchronous motor 4.

  The rotation of the motor shaft 3 induces motor current and voltage in the synchronous motor 4. As can be seen from FIG. 1, the control electronics 5 have measuring means 16 which can be configured as a current measuring device or a voltage measuring device. In this case, the measuring means 16 measures the voltage U or the motor current I induced by the rotational movement of the manually formed godet peripheral wall 1 and the motor shaft 3. The measured value of the induced voltage or induced motor current is supplied to the evaluation unit 19 of the control electronics 5.

  In order to uniquely associate the signal induced as a result of the rotational movement of the motor shaft with a manually performed process, the amplitude of the signal and thus the induced voltage and / or the induced motor current are uniquely defined. It is impossible to evaluate. For example, when removing the thread winding around the godet peripheral wall 1, a rotational movement of the motor shaft may also be formed, and this rotational movement induces an electric current or voltage. In order to distinguish these rotational movements, the detected signal is differentiated. For this purpose, the evaluation unit has a differentiation operator 33 which detects the rate of increase of the induced voltage and / or the induced motor current. The increasing speed is represented by the quotient d / dt in FIG. This increasing speed is proportional to the angular acceleration of the motor shaft 3. Therefore, the derivative of the measurement signal is a measure of the angular acceleration a.

Angular acceleration required to start the process of the synchronous motor 4 is stored as the threshold value a _s. Such a threshold value can preferably be stored in the memory means 18 of the control electronics 5. In order to compare the actual state with a threshold value, the evaluation unit 19 comprises a comparator 34 that compares the calculated angular acceleration with a threshold value a _{s of} angular acceleration. When the threshold a _s angular acceleration is exceeded, the evaluation unit 19, a control signal for starting the synchronous motor 4 is formed. For this purpose, the evaluation unit 19 supplies a corresponding signal to the inverter 17. If the angular acceleration threshold a _s has not been exceeded, the starting function is not triggered by the evaluation unit 19.

The flowchart illustrated in FIG. 3 for generating the start signal is an example. However, it is basically also possible to generate the starting signal directly from the induced signal. For example, FIG. 4 schematically shows the time course of the induced motor current. In the diagram, time t is plotted on the horizontal axis and motor current I is plotted on the vertical axis. The diagram of FIG. 4 shows two transitions marked with reference signs I ₁ and I ₂ . The motor current I ₁ is measured by the synchronous motor 4 when, for example, the rotational movement of the godet peripheral wall is manually formed by an operator. The limit curve marked with reference symbol I ₂ represents, for example, an undesirable rotational movement of the godet peripheral wall during removal of the thread winding. The transition of the induced motor current I _{1 and} the transition of I ₂ are substantially different, for example, in terms of the slope that can be seen from the time difference t ₁ -t ₂ . Current values I ₁ and I ₂ are measured at time t ₁ , in which case measured value I ₁ is greater than measured value I ₂ . Accordingly, at time t ₂ , current values I _{1 ′} and I _{2 ′} are measured. Now, for differentiation, the measured value change that occurs for each time difference is recorded and evaluated. The measured value changes I _{1 ′} −I ₁ and I _{2 ′} −I ₂ occurring at the time difference t ₁ −t ₂ are measures of the rate of change of the current value. In this way, by comparing the actual values with the threshold values not plotted in this diagram, each rotational movement formed by the godet peripheral wall is identified and used for restarting the motor drive. It becomes possible to do.

  FIG. 5 shows another embodiment of a godet according to the invention, as used, for example, in textile machines. The embodiment of FIG. 5 illustrates a total of four godets, which are arranged on one common support 27. The support 27 holds a plurality of godet peripheral walls 1 and a plurality of rollers 28 on the front side, and these are held by the support 27 so as to be freely rotatable relative to each other in a cantilever manner. These godet peripheral walls 1 are respectively coupled to the electric drive unit 2 disposed on the rear side of the support body 27 via the motor shaft 3. In the present embodiment, a total of four electric driving units 2 are arranged next to each other. The number of the electric drive units 2 and the number of the godet peripheral walls 1 in the support body 27 are examples. Basically, 8, 12, 16, or more godets can be placed on one godet support.

  Each godet held by the support 27 is configured in the same manner as the embodiment of FIG. In the case of the embodiment shown in FIG. 5, power is supplied to each electric drive unit 2 through one power supply line 21, and this power supply line 21 includes a group control unit 35 and a group switch 36. To the upper power supply unit (not shown in detail). Each electric drive 2 is connected to a group control unit 35 via one data line 20 which is preferably configured as a BUS system. The group control unit 35 is coupled to the machine control unit 22.

  In the group control unit 35, operation parameters set in advance for operating the corresponding godets are stored, and each electric drive unit 2 can be individually designated and driven. .

  In the present embodiment, it is also possible to assign a separate switch 23 to each drive unit 2 in order to make it possible to stop the godet peripheral wall at the time of product replacement. In FIG. 5, these switches 23 are indicated by broken lines. When thread winding occurs in one of these godet peripheral walls 1 and the operation needs to be interrupted, the godet is operated and controlled in accordance with the above-described embodiment of FIGS. . In this case, reference is made to the above description.

  The godet according to the present invention, the method for controlling the godet according to the present invention, and the method for operating the godet according to the present invention provide a quick and reliable process progression when there are a large number of machining locations inside the textile machine. Particularly suitable for maintaining. In this case, troublesome wiring can be avoided by using a brushless synchronous motor in which control electronic equipment is incorporated. Furthermore, a quick reaction time can be realized when the operating state changes.

Claims (18)

A godet for guiding the thread,
The godet has a drivable godet peripheral wall (1) coupled to an electric drive (2),
In Godet,
The electric drive unit (2) is configured such that the operation of the electric drive unit (2) can be restarted by a rotational movement of the manually formed godet peripheral wall (1) after the operation is interrupted.
Godet characterized by that. The electric drive unit (2) is constituted by a brushless synchronous motor (4) incorporating a control electronic device (5),
The godet peripheral wall (1) is fixedly connected to the motor shaft (3) of the synchronous motor (4).
The godet according to claim 1. Said control electronics (5) comprises a voltage measuring device (16) for detecting the induced voltage (U) and an evaluation unit (19) for generating a start signal,
The godet according to claim 2. The control electronics (5) comprises a current measuring device (16) for detecting the motor current (I) and an evaluation unit (19) for generating a start signal,
The godet according to claim 2. The evaluation unit (19) has a differential operator (33) for determining the angular acceleration (a) of the motor shaft (3) of the synchronous motor (4).
The godet according to claim 3 or 4. The evaluation unit (19) has the angle actually stored values threshold acceleration (a) (a _s) a comparator for comparing (34),
The godet according to claim 5. Friction means (24) is assigned to the godet peripheral wall (1) at a small interval, and the friction means (24) has a friction surface (26) on the side facing the godet peripheral surface,
The electric drive unit (2) has an operating torque monitoring unit (16, 19).
The godet according to any one of claims 1 to 6. The godet peripheral wall (1) cooperates with a roller (28) supported so as to be relatively rotatable in order to guide the thread (29) in a state of being wound a plurality of times.
The godet according to any one of claims 1 to 7. A manual switch (23) for starting and stopping the godet peripheral wall (1) is assigned to the electric drive unit (2).
The godet according to any one of claims 1 to 8. A method for controlling a godet,
The godet peripheral wall of the godet is driven by an electric drive unit.
In the method
The electric drive part is restarted by a rotational movement of the godet peripheral wall formed manually after the operation is interrupted,
A method characterized by that. The godet peripheral wall is driven by a motor shaft of a brushless synchronous motor in which control electronics are incorporated,
The method of claim 9. Measuring the current and / or voltage of the synchronous motor during the rotational movement of the motor shaft and generating a start signal in the control electronics from the measured value;
The method of claim 10. Measuring a current increase and / or a time voltage increase of the synchronous motor during the rotational movement of the motor shaft, and generating a start signal in the control electronics from the measured value;
The method of claim 10. Obtaining an angular acceleration of the motor shaft, and generating the start signal based on a comparison between an actual value of the angular acceleration and a threshold value;
The method according to claim 11 or 12. Continuously monitoring the operating torque of the electric drive,
15. A method according to any one of claims 10 to 14. A method of operating a godet in a textile machine,
Driving the godet peripheral wall by an electric drive to guide the yarn in the operating state;
In the method
After the operation is interrupted, the electric drive unit is restarted by the rotational movement of the godet peripheral wall manually formed by an operator.
A method characterized by that. The godet peripheral wall is driven by a brushless synchronous motor incorporating control electronics,
Performing the rotational movement manually formed in the godet peripheral wall to restart the synchronous motor in the direction of motor rotation or in the opposite direction to the motor rotation direction;
The method of claim 14. When group-switching a plurality of electric drive units of a plurality of godet peripheral walls, one electric drive unit is started and stopped by one manually operable switch.
16. A method according to claim 14 or 15.

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