JP2006206327A - Method and device for winding up yarns - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To roughly completely avoid unallowable vibration generated in structure groups while yarns are wound up on a bobbin in a device for winding up the plurality of yarns on the bobbin mounted on a drivable bobbin spindle. <P>SOLUTION: This device comprises a plurality of traverse units 7.1 and 7.2 disposed correspondingly to the yarns and a pressing roller 6 disposed between these traverse units and the bobbin spindle 3.1. The bobbin spindle 3.1, the traverse unit, and the pressing roller 6 are held by the frame parts 1.1, 1.3, and 1.4 of a machine frame 1 in the form of structure groups independent of each other. Each of the structure groups comprises a prescribed natural frequency. The plurality of yarns 21 are wound up on the bobbin 5 mounted on the drivable bobbin spindle 3.1. Also, the device comprises a means 10 affecting the rigidity of the frame 1.3 by at least one of the frame parts 1.1, 1.3, and 1.4 to change the natural frequency of each of the structure groups during the yarn windup operation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a method for winding a plurality of yarns on a bobbin provided on a rotating bobbin spindle, wherein the yarns are reciprocally guided by respective traverse units before being applied to the bobbin, and In order to maintain a substantially constant winding speed, guide the rotational speed of the bobbin spindle as the bobbin becomes larger. The bobbin spindle, the traverse unit, and the pressure roller are held by the frame portion of the machine frame as independent structural groups, and a predetermined natural frequency is given to each structural group, and the driveable bobbin spindle is provided. A device for winding a plurality of yarns around a bobbin, a plurality of traverse units assigned to the yarns, and these traversers A pressure roller disposed between the unit and the bobbin spindle. The bobbin spindle, the traverse unit, and the pressure roller are held as separate structural groups by a frame portion of the machine frame, and each structural group is predetermined. Of the type having the natural frequency of

  A method and apparatus for winding a plurality of yarns on a bobbin of the type mentioned at the outset is known from German Offenlegungsschrift 4,240,920.

  Such an apparatus is used for winding on a bobbin after spinning in the production of a synthetic fiber yarn. In order to obtain a high yarn withdrawal speed during such a spinning process, the bobbin spindle provided for receiving the bobbin has a very high rotational speed of up to 30000 rev / min, relative to the bobbin diameter. Since it is necessary to rotate in a range, strong vibrations are caused by the dynamism of the bobbin spindle with the bobbin in particular. Such vibrations are transmitted to the machine frame or to a group of structures that cooperate directly with the bobbin and bobbin spindle. This structure group is a structure group that performs the yarn guide and the yarn movement of the winder. In general, this type of structure group is held by the frame of the machine frame, thereby forming a system that easily vibrates with the frame.

  According to German Offenlegungsschrift 4,240,920, it is known to arrange a vibration attenuator corresponding to such a group of structures, in particular to damp vibrations caused by the occurrence of resonance. In this case, resonance occurs when the excitation frequency matches the natural frequency of the structure group. However, this type of vibration attenuator is a general type and operates only within a very narrow frequency range, in which case the rotational speed range in which resonance occurs varies in relation to half the number of circumferences. Therefore, in order to be able to operate the structural group within the natural frequency range, very expensive technical costs are incurred.

In a winder known from German Offenlegungsschrift 100 60 593, piezoelectric elements (piezo elements) are used in the structure group to damp vibrations. Such a type of piezoelectric element consists of a piezoelectric actuator and a piezoelectric sensor, in which case the shape change caused by the vibration of the structure group is used to actuate the piezoelectric actuator. In this case as well, a very expensive cost is required to dampen the vibration generated based on the occurrence of resonance in the structure group.
German Patent Publication No. 4240920 German Patent Publication No. 10060593 German Patent Publication No. 10128077

  The object of the present invention is to improve a method and apparatus for winding a plurality of yarns on a bobbin of the type described at the outset, so that unacceptable vibrations that occur in the structure group during winding of the yarn on a bobbin are substantially reduced. It is to be able to avoid it completely.

  According to the means of the method of the present invention that solves this problem, the natural frequency of at least one structural group is changed in relation to the operating rotational speed of the bobbin spindle by the switchable reinforcing member of the frame.

  Further, according to the means of the apparatus of the present invention that solves this problem, at least one frame portion affects the rigidity of the frame portion in order to change the natural frequency of the structure group during the winding operation of the yarn. Has a means to give.

  Advantageous embodiments of the invention are defined by the features described in the dependent claims and combinations of these features.

  The invention differs from the device known from German Offenlegungsschrift 10128077. In this known device, the compensating mass body is movably guided by the rotating body in order to reduce the occurrence of unbalance or vibration caused by the position change of the compensating mass body. However, the frequency change of the natural frequency of the rotating body caused by this cannot prevent the generation of the excitation frequency. Therefore, the excitation frequency is transmitted to the adjacent frame or structure group without being disturbed, and resonance occurs.

  The method and apparatus according to the present invention comprises a driven bobbin spindle and a vibration generated by the bobbin held on the outer peripheral surface of the bobbin spindle when the yarn is wound. Starting from transmitting to the frame. In order to prevent the excitation frequency in the structural group from causing unacceptable vibrations, according to the present invention, the structural frequency is varied in order to change the natural frequency of the structural group in relation to the operating speed of the bobbin spindle. A switchable reinforcing member (schaltbare Versteifung) is provided in the frame portion assigned (correspondingly arranged) to the group. For this reason, the frame part of the structure group has means for influencing the rigidity of the frame part. Therefore, no additional damping device is assigned to the structural group. This is because the structure group is driven within a frequency range in which resonance does not occur, and therefore occurrence of resonance is avoided.

  By connecting or cutting off the reinforcing member of the frame part, the natural frequency can be displaced both to increase and decrease the frequency range. Within a given speed range, the frame structure with a given flexibility will work more favorably than a rigid structure, or vice versa. It has been confirmed that it works more favorably than the structure having the property. Thereby, the frame can be influenced selectively as a flexible structure or as a rigid structure.

The bobbin spindle excitation is related to the length of the bobbin spindle and the number of bobbins wound up on the bobbin spindle. Thus, for example, the resonant vibration of the structure group formed by the traverse unit is advantageously up to a predetermined time after the start of the winding motion, with a bobbin spindle length of 1500 mm and eight bobbins. It is increased from a value E ₀ to the value E _m by connecting the reinforcing member.

  Otherwise, in order to switch to a flexible structure at a predetermined point when the operating speed increases, it is necessary to start the winding motion with a reinforced structure group.

  In order to monitor the winding process and to avoid resonance vibrations, according to an advantageous embodiment, the operating speed of the bobbin spindle is continuously monitored and the excitation frequency produced by the bobbin spindle is the natural vibration of the structure group. Before the number matches, the connection or disconnection of the reinforcing member of the frame portion is started.

  In this case, the reinforcement of the frame is effected in an advantageous manner by at least one connecting member that connects the two frame supports of the frame together.

  In order to be actuated, an actuator is advantageously assigned to the connecting member (corresponding arrangement).

  In order to be able to implement the yarn reciprocating guide within the traverse stroke, which is particularly necessary for winding the yarn, with high accuracy and accuracy, according to the embodiment of the present invention, the frame portion of the traverse unit is provided. Is formed by a traverse support with a switchable reinforcing member, thereby changing the natural frequency of the rubber unit.

  A switchable reinforcing member may be provided between a plurality of adjacent frame portions of a plurality of structural groups.

  According to the apparatus of the present invention, the means for influencing the rigidity of the frame portion has at least one actuator, which is connected to the control device, and the control device drives the bobbin spindle. It is to be monitored. As a result, the yarn can be wound within the predetermined rotational speed range while always considering the optimum frame structure of the apparatus.

  In order to generate the controlled vibrations, the device according to the invention is in an advantageous form, the control device having a data memory and a comparator, which is the excitation frequency generated by the bobbin spindle and the uniqueness of the structure group. Adjustment between frequency is always performed. In this case, an excitation frequency that is likely to be generated is detected and can be avoided proactively by switching the reinforcing member.

  In particular, a traverse support is provided as a changing frame in order to hold a traverse unit that influences the yarn feeding movement so as not to vibrate as much as possible. The traverse support is held in the machine frame parallel to the bobbin spindle and has at least two elongated frame supports joined at both ends. A connecting member is disposed at least in the central region.

  In this case, the connecting member and the actuator are advantageously formed by a piston / cylinder unit, which is fixed to one of the frame supports and is free of the piston rod. And can be fastened to the other frame support.

  In the following, the invention will be described by means of an embodiment of the device according to the invention shown in the drawings.

  1 and 2 show a first embodiment of the device according to the invention. In this case, FIG. 1 shows a schematic side view of the device, and FIG. 2 shows a schematic cross-sectional view of the device. The following description applies to both FIGS. 1 and 2 unless otherwise indicated.

  This device has a machine frame 1 composed of a plurality of assembled frame parts 1.1, 1.2, 1.3. Each of the frame portions 1.1 to 1.4 supports a device involved in the work of winding the yarn around the bobbin. Accordingly, the bobbin revolver 2 is rotatably supported in the frame portion 1.1. Two bobbin spindles 3.1 and 3.2 protruding long from the bobbin revolver 2 are arranged on the bobbin revolver 2 so as to be shifted from each other. A plurality of bobbin winding tubes 4 are fitted on the free ends of the bobbin spindles 3.1 and 3.2, respectively, and are held so as to be tightened. The bobbin 5 is formed by winding the thread 21 around the bobbin winding tube 4 fitted on the bobbin spindle 3.1 held in the operation region by the bobbin revolver 2. In this embodiment, the device has a total of three windings arranged adjacent to each other. In this case, the number of winding parts is one example. This type of device can have ten, twelve or sixteen adjacent windings.

  Bobbin spindles 3.1 and 3.2 are coupled at their bearing ends to spindle drives 15.1 and 15.2, respectively.

  On the upper side of the frame part 1.1, the frame parts 1.2, 1.3 and 1.4 are held substantially parallel to the bobbin spindles 3.1, 3.2. A frame part 1.4 configured as a swing arm (wing) is coupled to the frame part 1.2 by a pivot shaft 12. The pressure roller 6 is rotatably supported by the frame part 1.4 at the free end of the swing arm. The pressure roller 6 is supported by the outer peripheral surface of the bobbin 5 while winding the yarn.

  A traverse device 7 including a plurality of traverse units 7.1 to 7.3 is disposed above the pressure roller 6. The traverse device 7 is held by the frame 1.3. The frame part 1.3 is coupled to the frame part 1.4. The frame 1.3 configured as a traverse support 8 has two frame supports 8.1, 8.2 arranged at a distance from each other. Are joined together, thereby forming a traverse support 8. In order to selectively tighten the frame supports 8.1 and 8.2 together, a connecting member 10 is provided in the central region of the traverse support 8. In this case, the connecting member 10 is formed by two tension elements 11.1, 11.2 spaced apart from each other, which tension elements are respectively one actuator 9.1, 9.1. Can be clamped between the frame supports 8.1 and 8.2. The actuators 9.1 and 9.2 and the tension elements 11.1, 11.2 can be formed, for example, by a piston / cylinder unit. By actuating the piston / cylinder unit, the piston rod as a tensioning element guided outside the cylinder is directly clamped against the frame support 8.2 located opposite to each other.

  The actuators 9.1 and 9.2 are connected to the control device 14 via a control line. The control device 14 is connected to a rotation speed sensor 13, and this rotation speed sensor detects the rotation speed of the pressure roller 6 during the winding process. In this case, the signal of the rotational speed sensor 13 is controlled in the control device 14 so that the spindle driving device 15.1 or 15.2 maintains the peripheral speed of the bobbin substantially constant while the bobbin is being wound. Used for.

  In order to wind up the yarn 21, the yarn is supplied to the device via a so-called yarn end sensor 16. Each yarn 21 is reciprocated within the traverse stroke by the yarn guides of the traverse units 7.1 to 7.3 to be applied to the bobbin 5, and after being partially wound around the outer peripheral surface of the pressure roller 6, the bobbin 5 is guided.

  In order to wind the thread 21 around the bobbin 5, the bobbin spindle 3.1 is driven via a spindle drive 15.1. In this case, vibrations are excited at an excitation frequency that varies in relation to the drive speed of the bobbin spindle 3.1. The vibration is transmitted directly to the adjacent structural group at this excitation frequency or indirectly through the machine frame 1. As the adjacent structural group, first, the pressure roller 6 having the frame portion 1.4 is cited. The traverse device 7 with the traverse support 8 as another adjacent structure group is subjected to vibration. In this case, the frame part 1.3 forming the traverse support 8 has means for influencing the rigidity of the frame part. This means is formed by the connecting member 10. In the state shown in FIGS. 1 and 2, since the connecting member 10 is not operated, the frame 1.3 has a flexible structure.

In order to further explain the function of the device shown in FIGS. 1 and 2, the schematic control for operating the actuators 9.1, 9.2 assigned to the frame 3.1 shown in FIG. Reference is made to the figure. In this case, the control device 14 has at least one data memory 17 and a comparator 18. The data memory 17 stores the natural frequency of the structural group including the traverse device 7 and the frame 1.3. In this case, the natural frequency of the structural group without reinforcement of the frame 1.3 is represented by a value _Eo . Natural frequency of the structure group having a reinforced structure of the frame portion 1.3 is represented by a value E _m.

To monitor and control the structure group, the working rotational speed of the winding spindle 3.1 in the control device 14 continuously detects, in this case, the working rotational speed is represented by the symbol n _s. Directly from the working rotational speed of the winding spindle n _s, the excitation frequency E _r is obtained acting on the structure group. In comparator 18, the excitation frequency E _r, coordination between the natural frequency E _o or E _m stored structural group is performed.

As a result, in the state shown in FIGS. 1 and 2, the excitation frequency is first adjusted to the natural frequency E _o which is important for the structure group without reinforcement. When the critical state is reached, a control signal for operating the actuators 9.1 and 9.2 is transmitted in the control device 14 in order to avoid the occurrence of resonance.

  As shown in FIGS. 1 and 2, when the actuators 9.1, 9.2 are actuated, the tensioning elements 11.1, 11.2 extend and the two frame supports 8 .. 1, 8.2 acts as a tension support (stretch support), whereby the traverse support 8 is reinforced and thus acts to change the natural frequency within the structural group. In this case, the natural frequency is decreased or increased in relation to the structural group.

  In one embodiment of the device according to the invention, which is 1500 mm long and has a total of 8 windings, a frequency change of a magnitude of 10 Hz is obtained by reinforcing the frame. This avoids critical resonances in the structure group in an advantageous manner.

  In the embodiment shown in FIGS. 1 and 2, the possibility of selectively acting between two adjacent frame parts is obtained. For this purpose, FIG. 2 shows the position of the actuators 9.1, 9.2 in which the tension elements 11.1, 11.2 are arranged between the frame parts 1.4, 1.3. ing. Thereby, for example, the natural frequencies of adjacent structural groups can be changed simultaneously. The adjacent structural group is a structural group including the pressure roller 6 and the frame portion 1.4, and a structural group including the traverse device 7 and the traverse support body 8.

  FIG. 3 and FIG. 4 show another embodiment of a frame portion having a switchable reinforcing member. In this case, the frame portion is formed by the frame plate 19, and a plurality of traverse units (not shown) can be held on the frame plate 19. The frame plate 19 is coupled to a U-shaped reinforcing curved member 20, and this reinforcing curved member 20 extends over almost the entire length of the frame plate 19, and its free leg end is fixed to the frame plate 19. Has been. A plurality of actuators 9.1, 9.2 with actuable tension elements 11.1, 11.2 are arranged over the entire length of the reinforced bending member 20. In order to increase the rigidity of the frame plate 19, the actuators 9.1, 9.2 are actuated, whereby the base frame 19 is tension-supported by the reinforcing bending member 20 via the tension elements 11.1, 11.2. .

  The configuration of the means for influencing the rigidity of the frame shown in FIGS. 1 to 4 is only shown as an example. Basically, the invention applies to means in which the structure of the frame can be changed between a flexible state and a stirrer state. Thus, for example, the two frame supports may be connected by electromagnets or by fastening members.

Fig. 2 is a schematic side view of an embodiment of the device according to the invention. FIG. 2 is a schematic cross-sectional view of the embodiment shown in FIG. 1. It is the schematic which shows control of the control apparatus of the Example shown in FIG. It is a schematic side view which shows the Example of the frame part provided with the switchable reinforcement member. It is a schematic side plan view which shows the Example of the frame part provided with the switchable reinforcement member.

Explanation of symbols

  1 machine frame, 1, 1.1, 1.2, 1.3, 1.4 frame, 2 bobbin revolver, 3.1, 3.2 bobbin spindle, 4 winding tube, 5 bobbin 6 pressing roller, 7 traverse Device, 7.1, 7.2, 7.3 Traverse unit, 8 Traverse support, 8.1, 8.2 Frame support, 9 Actuator, 10 Connecting member, 11 Tension element, 12 Rotating shaft, 13 Number of rotations Sensor, 14 Control device, 15.1, 15.2 Spindle drive device, 16 Thread end sensor, 17 Data memory, 18 Comparator, 19 Frame plate, 20 Reinforced bending member, 21 Thread

Claims (18)

A method of winding a plurality of yarns on a bobbin provided on a rotating bobbin spindle, wherein the yarns are reciprocally guided by their own traverse unit and applied to rotate before the yarns are applied to the bobbin. In order to maintain a substantially constant winding speed, the driving speed of the bobbin spindle is changed as the bobbin becomes larger, and the bobbin In the method in which the spindle, the traverse unit, and the pressure roller are each held as an independent structural group by the frame portion of the machine frame, and each structural group is given a predetermined natural frequency,
A method for winding a plurality of yarns, characterized in that the natural frequency of at least one structural group is varied in relation to the operating speed of the bobbin spindle by means of a switchable reinforcing member of the frame.   The method according to claim 1, wherein the natural frequency of the structural group is increased or decreased by connecting or blocking the reinforcing member of the frame portion. The natural frequency of the structure group, after the start of the winding motion, by connecting the reinforcing member, increasing from the value E _o to the value E _m, The method of claim 2 wherein. The natural frequency of the structure group, after the start of the winding motion, by interrupting the reinforcing member, lower from the value E _m to the value E _o, method of claim 2 wherein.   2. The operating speed of the bobbin spindle is continuously monitored, and the connection or disconnection of the frame reinforcing member is started before the excitation frequency generated by the bobbin spindle matches the natural frequency of the structural group. 5. The method according to any one of items 4 to 4.   The method according to claim 1, wherein the frame part is reinforced by at least one connecting member that connects the two frame supports of the frame part to each other.   The method of claim 6, wherein the connecting member is operated by a controllable actuator.   The method according to any one of claims 1 to 7, wherein the natural frequency of the traverse unit is changed, wherein the frame of the traverse unit is formed by a traverse support provided with a switchable reinforcing member.   The method according to claim 1, wherein the switchable reinforcing member acts between a plurality of adjacent frame portions of the plurality of structural groups. A device for winding a plurality of yarns (21) around a bobbin (5) provided on a drivable bobbin spindle (3.1), wherein the plurality of traverse units (7.1) are arranged corresponding to the yarns. 7.2) and a pressure roller (6) disposed between the traverse unit (7.1, 7.2) and the bobbin spindle (3.1). (3.1), the traverse unit (7.1, 7.2, 7.3) and the pressure roller (6) as independent structural groups, the frame portion (1.1, 1) of the machine frame (1) 3 and 1.4), and each structural group has a predetermined natural frequency.
In order to change the natural frequency of the structural group during the winding operation of the yarn, at least one frame (1.1, 1.3, 1.4) has a rigidity of the frame (1.3). Device for winding a plurality of yarns, characterized in that it comprises means (10) for influencing.   The means (10) for influencing the rigidity of the frame is configured such that the natural frequency of the structural group (7, 8) can be changed by connecting or disconnecting the reinforcement of the frame (1.3). The apparatus of claim 10.   The means (10) that influences the rigidity of the frame has an actuator (9.1) for operating the means (10), and the actuator (9.1) is connected to the control device (14). 12. The device as claimed in claim 11, wherein the device is connected so that the control of the bobbin spindle (3.1) is monitored by the control device (14).   The control device (14) has a data memory (17) and a comparator (18), and the comparator (18) generates an excitation frequency and a structure group (7) generated by the bobbin spindle (3.1). 8) is always adjusted. In this case, before the excitation frequency matches the natural frequency of the structural group (7, 8), the actuator (9.1) The device according to claim 12, wherein a control signal for actuating the device is transmitted.   A means for influencing the rigidity of the frame is formed by the connecting member (10), and the two supporting members (8.1, 8.2) of the frame (1.3) are formed by the connecting member (10). 14. The device according to any one of claims 10 to 13, wherein the devices are connectable to each other.   15. A frame according to any one of claims 10 to 14, wherein the frame (1.3) is formed by a traverse support (8) for receiving a traverse unit (7.1, 7.2). apparatus.   A traverse support (8) is held in the machine frame (1) parallel to the bobbin spindle (3.1) and has at least two elongated frame supports (8.1, 8.2). The two frame supports are connected to each other at both ends, and the connecting member (10) is arranged at least in the central region of the frame support (8.1, 8.2). 15. The device according to 15.   The connecting member (10) and the actuator (9.1) are formed by a piston / cylinder unit. The cylinder is fixed to one of the frame supports (8.1), and the tension element (11. 17. A device according to any one of claims 14 to 16, wherein 1) is clampable to the other frame support (8.2).   18. The means for influencing the rigidity of the frame is formed by a connecting member (10) acting between two adjacent frames (1.3, 1.4). The device according to any one of the above.

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