Method for controlling the rotation of a winding turret of a winding machine and winding machine

Abstract

The invention relates to a method for the rotation control of a winding turntable (1) of a winding machine and to a winding machine having two protruding winding spindles (3.1, 3.2) on a rotatably mounted winding turntable (1). The winding turntable (1) is driven by a chain drive (10) so that the winding spindles (3.1, 3.2) are alternately guided in a winding area to wind a yarn bobbin and guided to a replacement area to remove the yarn bobbin. In order to determine the angular position of the winding turntable (1), the chain drive (10) detects the teeth (6) of a sprocket (10.1) fixed to the winding turntable (1). For this purpose, a sensor device (14) is assigned to the chain drive (10).

Description

Technical Field

[0001] The present invention relates to a method for rotation control of a winding turret of a winding machine and also to a winding machine for winding yarn to form yarn bobbins. Background Art

[0002] A generic method for the rotation control of a winding turret of a winding machine and a generic winding machine are known from DE 10 2010 022 193 A1.

[0003] In the melt spinning process, the yarn is wound into yarn bobbins at the end of the process for storage purposes. The yarn must be wound into yarn bobbins in a manner as continuous as possible, but due to the limited number of yarns in the yarn bobbins, this requires special winding machines. Such a winding machine has two winding spindles, which are arranged offset by 180° and held on a winding turntable. The winding turntable is rotatably mounted in a frame and connected to a rotary drive. Thus, the winding spindles can be alternately guided into a winding area and a changing area, where the yarn winding or transfer between the winding spindles and the yarn bobbins to be wound is carried out in an automatic manner. As a result, advanced melt spinning processes can be carried out in a continuous manner.

[0004] However, in the case of such winding machines, the winding turret must adopt a defined angular position in the machine frame for positioning the winding spindle, in particular for winding the yarn bobbins. Therefore, it is known to use a position sensor to detect the position of the winding turret. The position sensor used is usually a rotary transformer, which directly generates a proportional measurement signal for each angular position of the winding turret. However, such rotary transformers are very prone to malfunction, as a result of which common methods and common winding machines avoid their use.

[0005] In the case of a generic method for controlling a winding turret of a winding machine, and in the case of a generic winding machine, the angular position of the winding turret is acquired by means of a distance measurement. The winding turret therefore has a surrounding distance profile, which cooperates with a distance sensor on the machine frame. It is thus possible to assign a determined distance to each angular position of the winding turret, which distance is acquired by the distance sensor and is therefore determinable. However, such a distance profile requires very high tolerance accuracy in production and also requires high tolerance requirements regarding the mounting situation in cooperation with the distance sensor. Summary of the invention

[0006] It is therefore an object of the present invention to provide a method for the rotational control of a winding turret of a winder and a winder in which the angular position of the winding turret can be determined in a very simple manner.

[0007] Another object of the present invention is to utilize existing means for determining the angle of the winding turret wherever possible so as to improve the method of controlling the rotation of the winding turret and the winding machine.

[0008] This object is achieved according to the invention by the method and by the winder.

[0009] The invention has the particular advantage that the angular position of the winding turret is directly available. To this end, the teeth of a sprocket of a chain drive, said sprocket being fixed to the winding turret, are detected. Thus, each tooth of the sprocket can be assigned a fixed angular position on the winding turret. By choosing the size of the sprocket and by the number of teeth around the circumference of the sprocket, the angle can be obtained in a very precise manner.

[0010] For this purpose, the winding machine comprises a sensor device which is configured such that the teeth around the circumference of a sprocket of the chain drive are detectable, wherein the sprocket is fixed to the winding turret. Due to the fixed association between the sprocket and the winding turret, a constant angular position which is determined in a constant manner is ensured during operation.

[0011] In order to detect the teeth around the circumference of the sprocket, the development of the invention has proven effective in this case, in which the tooth tips of the teeth of the sprocket are detected by an inductive proximity sensor which generates a binary signal. This achieves that during a rotation of the sprocket, each tooth triggers a unique signal which can be assigned to a specific angular position.

[0012] In order to be able to actuate and determine defined angular positions around the entire circumference of the sprocket independently of the number of teeth, a variant of the method is particularly advantageous in which the change in the rotation angle over time in the region of the tooth spacing between the teeth of the sprocket is additionally determined from the angular velocity of the sprocket. As is known, the angular velocity describes the change in the rotation angle over time. The angular velocity of the sprocket can therefore advantageously be used to determine the rotation angle between the tooth spacings.

[0013] In this regard, the winding machine comprises a machine control device connected to the sensor device and the control unit of the chain drive. The machine control device comprises at least one calculation module for determining the angular velocity of the sprocket and the rotation angle of the sprocket. Thus, advantageously, the sensor signal of the sensor device and the rotation speed information of the chain drive can be used to determine the exact angular position of the winding turntable.

[0014] This determination of the angular velocity of the sprocket is preferably performed by a method variant in which the angular velocity of the sprocket is determined as a function of the rotational speed of the drive motor of the chain drive and the reduction ratio of the chain drive between the drive motor and the sprocket. Thus, the rotational speed information of the drive motor can be used directly to determine the rotational angle during the tooth spacing between the teeth.

[0015] In this regard, the sprocket is configured to be drivable by a chain and a drive wheel, wherein a drive motor is assigned to the drive wheel, and wherein the reduction ratio between the drive motor and the sprocket is constant. In this way, a correlation between the angular velocities of the sprocket and the drive motor determined by the reduction ratio can be established.

[0016] Since each tooth of the sprocket corresponds to the angular position of the winding turret, the rotation angle of each tooth pitch is It can preferably be calculated from a mathematical relationship using a mathematical formula.

[0017]

[0018] Here, is the initial angle and ω M is the angular velocity of the drive motor. The reduction ratio of the chain drive is denoted by i. In this case, the clear time dependence of the angular velocity makes changes in the rotational speed clear, which, for example, occur in the case of ramps, starting or stopping, are all allowed.

[0019] In order to identify the position of the winding turret in the machine frame and to be able to determine a defined angular position, a variant of the method consists in that, in order to determine the zero position of the winding turret, the winding spindles are guided alternately into a change position in the change area before a process begins, the change position being detected by a switching cam, and it is particularly advantageous that the additional signal for determining the zero position is generated by a detectable marking around the circumference of the sprocket. In the case of such a winding machine, the change positions at which the yarn bobbins are usually removed from the respective winding spindles are fixed in the machine frame. Thus, the zero position in the reference stroke can be determined by means of the additional markings on the sprocket, using the change positions, which can be detected alternately by means of the switching cams for the two winding spindles.

[0020] For this purpose, the development of the winding machine according to the invention is particularly advantageous in which the winding turret comprises two switching cams which are arranged offset by 180° relative to one another and which cooperate with a cam sensor which determines the change position of the winding turret. Thus, the change position for removing the yarn bobbins on the respectively positioned winding spindles can be realized in an automatic manner, since in this case the winding spindles are held by the additionally stopped winding turret.

[0021] In this case, a refinement of the invention is particularly advantageous in which markings around the circumference of the sprocket can be detected by the proximity sensor. Thus, for example, the height of the teeth around the circumference of the sprocket can be used to generate individual signals for the proximity sensor. These signals can then be used to determine the angular zero position with the help of appropriate software.

[0022] In this regard, the sprocket has two different markings on its circumference which are arranged 180° offset relative to each other and which can be detected by the proximity sensor. No additional sensor is therefore required for determining the zero position. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to further explain the method for controlling a winding turret of a winding machine according to the present invention, exemplary embodiments of a winding machine according to the present invention will be described below with reference to the accompanying drawings.

[0024] In the attached picture:

[0025] Figure 1 A front view of an exemplary embodiment of a winding machine according to the invention is schematically shown.

[0026] Figure 2 Schematically shows Figure 1 A side view of an exemplary embodiment of the invention.

[0027] Figure 3 Schematically a diagram of the rotation angle as a function of time is shown.

[0028] Figure 4 Schematically shows Figure 2 A rear view of an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0029] exist Figure 1 and Figure 2 A first exemplary embodiment of a winding machine according to the invention is schematically shown in a number of views. Figure 1 Front view and Figure 2 In the absence of explicit reference to one of the figures, the following description applies to all figures.

[0030] An exemplary embodiment of a winding machine according to the invention comprises a rotatably mounted winding turret 1 which is held in a rotary bearing 9 of a machine frame 2. The winding turret 1 is connected to a chain drive 10 by which it is drivable to rotate in the direction of the arrow.

[0031] The winding turret 1 carries two winding spindles 3.1 and 3.2, which are arranged at an angle of 180° offset relative to each other. The winding spindles 3.1 and 3.2 are held on the winding turret 1 in a protruding manner and are each connected to a spindle drive 4.1 and 4.2. The winding spindles 3.1 and 3.2 are alternately guided into a winding area and a changing area by the rotation of the winding turret 1. In the winding area, a plurality of yarns 5 are wound in a parallel manner to form yarn bobbins 6, which are held on the driven winding spindle 3.1. In this case, as Figure 1 and Figure 2 As shown, the winding spindle 3.1 or the winding spindle 3.2 cooperates with a pressure roller 8 and a traversing device 11 for winding the yarn 5. In this regard, the pressure roller 8 is held by a roller carrier 12 so as to be movable on the machine frame 1. In the operating situation shown, the winding spindle 3.2 is located in the change area and carries two winding tubes 7 so that new bobbins can be wound.

[0032] Figure 1 and Figure 2 The exemplary embodiment shown comprises a total of two winding stations in order to be able to wind two yarns 5 in parallel to form a yarn package 6. The number of winding turrets is exemplary. In principle, such a winding machine comprises a plurality of winding stations in order to be able to wind, for example, 10, 12 or even 16 yarns in parallel to form a yarn package. Accordingly, the winding spindles 3.1 and 3.2 are held on the winding turret 1 so as to protrude in a lengthwise manner.

[0033] During the winding of the yarn 5 to form the yarn bobbin 6 and in order to start the spindle change between the winding spindles 3.1 and 3.2 after a completely wound bobbin has been obtained, the winding turret 1 is driven by a chain drive 10. For this purpose, Figure 2 As shown, the chain drive 10 comprises a sprocket 10.1 which is fixed to the winding turret 1. In this exemplary embodiment, the sprocket 10.1 is arranged on the circumference of the winding turret 1. A drive chain 10.2 is wound around the sprocket 10.1 and is driven by a drive wheel 10.3. The drive wheel 10.3 is arranged below the winding turret 1 and is connected to a drive motor 10.4. A control unit 10.5 is assigned to the drive motor 10.4. The control unit 10.5 is coupled to a machine control 13. The machine control 13 is also connected to the spindle drives 4.1 and 4.2 shown here and to the drives of the traverse devices which are not shown in greater detail here.

[0034] Outside the winding area of ​​the drive chain 10.2, a sensor device 14 is assigned to the sprocket 10.1. In the exemplary embodiment, the sensor device 14 is formed by an inductive proximity sensor 14.1. The proximity sensor 14.1 is connected to a computing module 15 of the machine control 13 via a signal line. The computing module 15 is connected to the control unit 10.5 of the chain drive 10 via a second signal line.

[0035] The proximity sensors 14.1 are arranged on the circumference of the sprocket 10.1 so that the tooth tip 16.1 of each tooth 16 around the circumference of the sprocket 10.1 is detectable. The proximity sensors 14.1 generate a binary signal so that the angle information relative to the position of the winding turret 1 relative to each tooth of the sprocket 10.1 is sent to the calculation module 15.

[0036] During operation, for the rotation control of the winding turret, in order to set a certain angular position, during the rotational movement of the sprocket 10.1, a sensor signal for each tooth 16 on the sprocket 10.1 is triggered at the proximity sensor 14.1 and provided to the calculation module 15. Here, the initial angle is determined Each tooth on the sprocket 10.1 is therefore assigned an initial angle Etc., the initial angle is changed by one pitch. Thus, the angular position of the winding turret 1 is defined in a precise manner relative to each tooth 16 of the sprocket 10.1.

[0037] To explain the function of the sensor device 14, Figure 3 Schematically shows the rotation angle as a function of time The dotted line shows the rotation angle during the rotation of the winding turret. The step curve then shows the processed sensor signal of the proximity sensor 14.1, each tooth 16 showing the exact angular position of the winding turret 1. At this point, the sensor signal triggered by the tooth passes through the angle and As an example. During the tooth spacing schematically plotted on the time line, the sensor signal is constant. In this phase, the rotation speed information of the chain drive is also used. The tooth spacing is Figure 3 The symbol Z L Shown.

[0038] During the movement of the winding turntable, the sprocket 10.1 rotates at an angle The transmission system for driving the sprocket 10.1 and comprising the chain 10.2, the drive wheel 10.3 and the drive motor 10.4 has a fixed and constant reduction ratio. By means of the reduction ratio i, it is thus possible to obtain the angular velocity ω of the drive motor 10.3 fromM And thus the angular velocity of the sprocket is determined from the rotational speed n of the drive motor (given by ω R In this regard, the following relationship applies:

[0039] ωR=i×ωM

[0040]

[0041] Based on the angular velocity ω of the sprocket R , it is not possible to determine, relative to each initial angle, the rotation angle from which this angular velocity prevails at each point in time. In this regard, the following mathematical relationship is used:

[0042]

[0043] In this case, the explicit time dependence ω M (t) indicates that changes in rotation speed, such as those occurring during ramping, starting or stopping, are fully permitted. The initial angle used is the corresponding angle determined by the sensor device 14 before the tooth spacing is reached. Thus, by means of a mathematical function, the angular position of the winding turret 1 can be determined by the calculation module 15 and made available to the machine control 13. Thus, the machine control 13 can control the winding turret 1 via the chain drive 10 in a precise manner even in the tooth spacing region of the sprocket 10.1.

[0044] In order to be able to assign a specific angular position to the teeth of the sprocket 10.1 detected by the sensor device 14, it is necessary to predetermine the absolute zero value of the rotation angle. Figure 4 An exemplary embodiment of a winder according to the invention is shown. Figure 4 A rear view of a winding machine with a drive train of a winding turret 1 is schematically shown. Figure 4 The exemplary embodiments of the present invention are similar in other respects to those according to Figure 1 and Figure 2 The exemplary embodiments are the same as those of FIG. 1 and therefore the differences are explained only in this regard.

[0045] exist Figure 4In the exemplary embodiment shown, two switching cams 17.1 and 17.2, which are arranged offset by 180° relative to each other, are arranged on the winding turret 1. The switching cams 17.1 and 17.2 are assigned to the winding spindles 3.1 and 3.2 and define a change position of the winding turret 1 in the change area. The change position of the winding spindles 3.1 and 3.2 is the position in which the completely wound bobbins are withdrawn from the winding spindles. This position is determined by the cam sensor 14.2 of the sensor device 14. The cam sensor 14.2 cooperates with the switching cams 17.1 and 17.2 so that during a rotation of the winding turret 1, each switching cam 17.1 and 17.2 at the cam sensor 14.2 causes a stop of the chain drive 10. The winding turret 1 can also be fixed in the change position.

[0046] In order to use these switching cams 17.1 and 17.2, which are configured offset by 180° relative to one another, for determining a reference stroke of zero angle, the sprocket 10.1 has in each case two markings, which are configured offset by 180° relative to one another and have different embodiments. In this exemplary embodiment, one of the markings 18.1 is formed by two shortened teeth 16 on the circumference of the sprocket 10.1. The second marking 18.2, which is offset by 180°, is formed by only one shortened tooth 16 on the sprocket 10.1. The shortened tooth 16 causes a change in the signal of the proximity sensor 14.1, which makes referencing possible within the calculation module. Thus, a 0° and 180° reference can be achieved.

[0047] Therefore, before the process starts, the operator guides each of the winding spindles 3.1 and 3.2 into the change position. In this case, the proximity sensor 14.1 runs past the markings 18.1 and 18.2 on the sprocket 10.1. Thus, for example, the marking 18.1 can be assigned an angle of 0°. The marking 18.2 is arranged offset by 180°, thereby maintaining an angle of 180°. In this way, the position of the winding turret and therefore the angular position is known and can be applied to each tooth of the sprocket 10 due to the constant tooth pitch.

[0048] The invention is based on a robust measuring system, which is free from failures, in order to be able to acquire the angular position of the winding turret during operation and to use it to control the winding turret.

Claims

1. A method for rotation control of a winding turret of a winding machine, the winding turret carrying two protruding winding spindles for continuously winding yarn bobbins, in which method the winding turret is driven to rotate by a chain drive device in a frame, in which method the winding spindles are alternately guided to a winding area for winding yarn bobbins and a replacement area for removing the yarn bobbins by rotating the winding turret, and in which method the angular position of the winding turret is determined by detecting the teeth of a sprocket wheel of the chain drive device, the sprocket wheel being fixed to the winding turret.

2. The method according to claim 1, characterized in that The tooth tips of the sprocket are detected by inductive proximity sensors.

3. The method according to claim 1 or 2, characterized in that: In the region of the tooth spacing between the teeth of the sprocket, the rotation angle (φ) is additionally determined by the angular velocity of the sprocket.

4. The method according to claim 3, characterized in that The angular velocity (ω) of the sprocket is determined by the rotation speed (n) of the drive motor of the chain drive and the reduction ratio (i) of the chain drive between the drive motor and the sprocket. R ).

5. The method according to claim 4, characterized in that The rotation angle From using The mathematical relationship is calculated, where is the initial angle and ω M is the angular velocity of the drive motor.

6. The method according to claim 2, characterized in that In order to determine the zero position of the winding turntable, the winding spindles are guided alternately into a change position in the change area before the start of the process, the change position being detected by a switching cam, wherein an additional signal for determining the zero position is generated by a detectable mark around the circumference of the sprocket.

7. The method according to claim 6, characterized in that These markings around the circumference of the sprocket are detectable by the proximity sensor.

8. A winding machine for winding a yarn (5) to form a yarn bobbin (6), the winding machine comprising at least one winding spindle (3.1, 3.2) mounted on a rotatable winding turret (1), the winding machine comprising a chain drive (10) for driving the winding turret (1), and comprising a sensor device (14) for acquiring the angular position of the winding turret (1), characterized in that The sensor device (14) is configured such that teeth (16) around the circumference of a sprocket (10.1) of the chain drive (10) are detectable, wherein the sprocket (10.1) is fixed to the winding turret (1).

9. The winding machine according to claim 8, characterized in that The sensor device (14) comprises an inductive proximity sensor (14.1) which can be used to detect the tooth tips (16.1) of the teeth (16) on the sprocket (10.1).

10. The winding machine according to claim 8 or 9, characterized in that: A machine control device (13) is connected to the sensor device (14) and to a control unit (10.5) of the chain drive (10), and the machine control device (13) comprises at least one calculation module (15) for determining the angular velocity of the sprocket (10.1) and the rotation angle of the sprocket (10.1).

11. The winding machine according to claim 8, characterized in that The sprocket (10.1) can be driven by a chain (10.2) and a drive wheel (10.3), wherein a drive motor (10.4) is assigned to the drive wheel (10.3) and wherein the reduction ratio (i) between the drive motor (10.4) and the sprocket (10.1) is constant.

12. The winding machine according to claim 9, characterized in that The winding turret (1) comprises two switching cams (17.1, 17.2) which are arranged offset by 180° relative to each other and cooperate with a cam sensor (14.2) which determines the change position of the winding turret (1).

13. The winding machine according to claim 12, characterized in that The sprocket (10.1) has two different markings (18.1, 18.2) on its circumference, which are arranged offset by 180° relative to each other and which are detectable by the proximity sensor (14.1).

Images