JP4162000B2 - Yarn length measuring device for yarn winding device - Google Patents

Description

  The present invention relates to a yarn length measuring device for a yarn winding device that winds a yarn while traversing it on a winding bobbin.

With respect to this type of yarn length measuring apparatus, Patent Document 1 discloses that a detection pulse generated by a drum rotation detector of a traverse drum is counted by a constant length counter in a traverse drum type yarn winding device (automatic winder). A yarn length measuring device configured to measure the yarn length is disclosed.
JP-A-5-286646 (0013 etc.)

On the other hand, Patent Document 2 discloses a yarn winding device (automatic winder) in which a winding bobbin rotation driving device and a traverse device are driven independently of each other. In Patent Document 2, it is disclosed that a winding bobbin of the type such as precision winding or step precision winding can be manufactured by making the winding bobbin rotation driving device and the traverse driving device independent of each other. . Patent Document 2 discloses a so-called take-up bobbin direct drive system configuration in which a take-up bobbin is coupled to a rotor of a take-up bobbin rotation drive device so as not to be relatively rotatable.
JP 2000-247542 A (0007, 0043, etc.)

  The configuration of Patent Document 2 is advantageous in that the winding bobbin and the traverse yarn guide are driven by independent motors, so that the above-described various winding methods are possible. The yarn length measuring device of Patent Document 1 cannot be applied to the device. That is, it is impossible to measure the yarn length in consideration of the traverse component traversed independently of the rotation of the roller in contact with the yarn layer as in Patent Document 1.

  The present invention has been made in view of the above circumstances, and its main object is to provide a yarn length measuring device suitable for a yarn winding device of a type in which a traverse device is driven separately from a winding bobbin rotation driving device. It is to provide.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

According to the first aspect of the present invention, the winding bobbin rotation driving device for rotationally driving the winding bobbin for winding the yarn and the winding bobbin rotation driving device are separated and driven, Yarn for measuring the winding length of the yarn wound around the winding bobbin in a yarn winding device provided with a traverse device for traversing the yarn when winding the yarn on the winding bobbin In the length measuring device, the following configuration is provided. Means for detecting the circumferential movement distance of the circumferential surface of the yarn layer formed by winding the yarn on the winding bobbin at every predetermined sampling period; and traverse of the yarn in the width direction of the yarn layer A means for detecting a moving distance every predetermined sampling cycle time; a yarn layer peripheral surface moving distance detected by the yarn layer peripheral surface moving distance detecting means; and a predetermined value by the traverse moving distance detecting means. type traversing movement distance detected for each sampling period time, respectively, from the input yarn layer peripheral surface movement distance and the traverse movement distance, determined Me a winding length of the wound yarn previously Kimakito bobbin Winding length calculating means.

  Thereby, in the yarn winding device of the type in which the winding bobbin rotation driving and the traverse driving are performed independently, the winding length of the yarn can be accurately measured.

In the yarn length measuring device of the yarn winding device, it is preferable that the predetermined sampling cycle time is an instantaneous time. Here, “instantaneous time” refers to a minute time that is sufficiently shorter than the time required for the traverse device to move by one traverse stroke, and specifically refers to a time of 1 second or less.

  Thereby, the precision of yarn length measurement can be further improved. That is, the yarn length can be accurately measured even if the traverse moving speed changes within one traverse stroke. In addition, the yarn length can be accurately measured while dealing with various fluctuations in the winding bobbin rotation speed and traverse movement speed.

  In the yarn length measuring device of the yarn winding device, the traverse device includes a traverse guide that is driven to move the yarn in the traverse direction, and a drive motor that drives the traverse guide. It is preferable that the rotation angle of the motor and the movement distance of the traverse guide maintain a predetermined relationship, and the traverse movement distance detection means detects the rotation angle of the drive motor.

  As a result, the traverse movement distance can be accurately detected with a simple configuration.

  In the yarn length measuring device of the yarn winding device, the yarn layer peripheral surface moving distance detecting means detects a rotation angle of the yarn layer diameter sensor that detects the diameter of the yarn layer and the winding bobbin. It is preferable that a bobbin rotation angle sensor is provided, and the yarn layer circumferential surface movement distance is obtained from detection results of the yarn layer diameter sensor and the winding bobbin rotation angle sensor.

  As a result, the yarn length can be accurately measured. That is, in the method of detecting the rotation angle of the roller in contact with the yarn layer as described in Patent Document 1, slippage may occur between the yarn layer and the roller, so that the measured value of the yarn length becomes inaccurate. It is easy to end up. In this respect, the yarn length can be accurately measured by configuring the yarn layer circumferential surface moving distance detecting means with the yarn layer diameter sensor and the winding bobbin rotation angle sensor as in this configuration.

  In the yarn length measuring device of the yarn winding device, the yarn layer diameter sensor is preferably capable of detecting the yarn layer diameter in a state where the winding of the yarn is stopped.

  As a result, the yarn length can be measured immediately after starting the winding of the yarn, so that the winding length of the yarn can be accurately measured. Further, a configuration in which a yarn bobbin rotation angle sensor and a roller rotation angle sensor are used as a yarn layer diameter sensor and the yarn layer diameter is calculated from the signals of both sensors is a winding bobbin after starting the yarn winding, When the rotation speed of the roller is low, the number of signals (number of pulses) from both sensors per unit time is small and the calculation processing by the calculation means is difficult. However, in this configuration, the yarn layer diameter sensor is used for winding the yarn. Therefore, the yarn layer diameter can be detected even when the rotational speed of the winding bobbin is low. In particular, with such a configuration, the yarn winding is equipped with a yarn defect removing device (yarn defect detector, yarn joining device, etc.), yarn defect detection, yarn winding stop, yarn defect removal, yarn joining, This is effective in a yarn winding device configured to repeat the resumption of yarn winding during yarn winding.

Next, embodiments of the invention will be described. FIG. 1 is a schematic front view showing a yarn winding unit of an automatic winder according to an embodiment of the present invention. FIG. 2 is a perspective view of a main part for explaining the calculation of the yarn winding length ΔYLs at the sampling cycle time Ts.

  First, the yarn winding unit (yarn winding device) 2 of the automatic winder 1 will be described with reference to FIG. The yarn winding unit 2 forms a yarn layer by winding a yarn 4 of a yarn supplying bobbin 3 around a winding tube 6 while traversing it with a traverse device 5 to form a package 7 having a predetermined length and a predetermined shape. . Although only one yarn winding unit 2 is shown in FIG. 1, an automatic winder 1 is configured by arranging a large number of such yarn winding units 2 on a machine base (not shown). In this specification, the winding tube 6 and the package 7 are collectively referred to as a winding bobbin. That is, the winding bobbin in which the yarn layer is not formed is the winding tube 6, and the winding bobbin in which the yarn layer is formed is the package 7.

  The yarn winding unit 2 includes a cradle (winding bobbin support member) 8 that removably supports the winding tube 6, a contact roller 9 that can be driven and rotated in contact with the circumferential surface of the yarn layer of the package 7, It has. The cradle 8 is configured such that it can be rotatably supported by sandwiching both ends of the take-up tube 6. Further, the cradle 8 is configured to be tiltable about the swing shaft 10, and the cradle 8 swings when the yarn 4 is wound around the winding tube 6 (increase in the diameter of the yarn layer). It can be absorbed by moving.

  A package drive motor (winding bobbin rotation driving device) 41 is attached to a portion of the cradle 8 that sandwiches the winding tube 6. The package driving motor 41 actively drives the winding tube 6 to rotate. The yarn 4 is configured to be wound up. The motor shaft of the package drive motor 41 is connected to the winding tube 6 so as not to rotate relative to the winding tube 6 when the winding tube 6 is gripped by the cradle 8 (so-called direct drive system). The operation of the package drive motor 41 is controlled by a package drive control unit 42, and the package drive control unit 42 is configured to control the operation / stop of the package drive motor 41 in response to a signal from the unit control unit 50. ing.

  Further, a package rotation sensor (winding bobbin rotation angle sensor) 43 is attached to the cradle 8, and the package rotation sensor 43 is a winding bobbin (winding tube 6, package 7) attached to the cradle 8. The rotation angle (how many times the winding bobbin has rotated) is detected. The rotation angle detection signals of the winding bobbins 6 and 7 are transmitted from the package rotation sensor 43 to the package drive control unit 42 and the unit control unit 50. Further, the rotation angle detection signal is also input to a traverse control unit 46 described later.

  Further, a package diameter sensor (yarn layer diameter sensor) 44 composed of a rotary encoder or the like is attached to the cradle 8, and the package diameter sensor 44 winds the thread 4 around the take-up tube 6 attached to the cradle 8. The diameter of the thread layer (package 7) formed by picking up can be detected by detecting the swing angle of the cradle 8. The package diameter sensor 44 can detect the diameter of the yarn layer both when the yarn 4 is wound and when the winding of the yarn 4 is stopped. The yarn layer diameter acquired by the package diameter sensor 44 is transmitted to the unit controller 50. The package rotation sensor 43 and the package diameter sensor 44 are yarn layer circumferential surface movements that detect a circumferential yarn layer circumferential surface movement distance of the circumferential surface of the yarn layer formed by winding the yarn 4 around the winding tube 6. It is a component of distance detection means.

  Further, the traverse device 5 is provided in the vicinity of the contact roller 9, and the traverse device 5 winds the yarn 4 around the package 7 while traversing. The traverse device 5 includes a traverse guide (yarn guide) 11 provided so as to be reciprocally movable in the traverse direction, and a traverse drive motor 45 that reciprocally drives the traverse guide 11.

  The traverse device 5 is provided with the traverse guide 11 in the form of a hook at the tip of an elongated arm member 13 configured to be rotatable around a support shaft, and the arm member 13 is moved by the traverse drive motor 45 as indicated by the arrow in FIG. It is the structure which carries out reciprocating turning drive like this. In the present embodiment, the traverse drive motor 45 is a voice coil motor.

  The operation of the traverse drive motor 45 is controlled by a traverse control unit 46, and the traverse control unit 46 is configured to control the operation / stop of the traverse drive motor 45 in response to an operation signal from the unit control unit 50. Yes. The traverse device 5 includes a traverse guide position sensor 47 formed of a rotary encoder or the like, detects the turning position of the arm member 13 (and consequently the position of the traverse guide 11), and sends a position signal to the traverse control unit 46. It is configured to be able to send. The traverse guide position sensor 47 is a component of the traverse movement distance detecting means.

  In this embodiment, as shown in FIG. 1, the package drive motor 41 that drives the winding bobbins 6 and 7 and the traverse drive motor 45 that drives the traverse guide 11 are provided separately, and the winding The bobbins 6 and 7 and the traverse guide 11 are configured to be driven (controlled) separately and independently. Thereby, when winding the yarn 4 onto the winding bobbins 6 and 7, various winding methods such as precision winding, step precision winding, and random winding can be realized.

  The yarn winding unit 2 arranges a yarn joining device 14 and a yarn clearer (yarn monitor) 15 in order from the yarn feeding bobbin 3 side in the yarn traveling path between the yarn feeding bobbin 3 and the contact roller 9. It has a configuration.

  The yarn joining device 14 includes a lower yarn on the yarn supplying bobbin 3 side and a package 7 side when the yarn clearer 15 detects a yarn defect and performs yarn cutting or when yarn breakage occurs during yarn unwinding from the yarn supplying bobbin 3. The upper thread is connected to the upper thread.

  The yarn clearer 15 is for detecting a thickness defect of the yarn 4, and the thickness of the yarn 4 passing through the yarn clearer 15 is detected by an appropriate sensor, and the signal from this sensor is analyzed by the analyzer. By analyzing at 23, a yarn defect such as a slab is detected. The yarn clearer 15 is provided with a cutter 16 for cutting the yarn 4 immediately when a yarn defect is detected.

  On the lower side and the upper side of the yarn joining device 14, a lower yarn catching guide means 17 for sucking and catching and guiding the lower yarn on the yarn feeding bobbin 3 side, and an upper yarn for sucking and catching and guiding the upper yarn on the package 7 side. A capture guide means 20 is provided. The upper thread catching and guiding means 20 is configured in a pipe shape, and is provided so as to be rotatable up and down around a shaft 21, and a mouse 22 is provided on the tip side thereof. Similarly, the lower thread catching and guiding means 17 is also configured in a pipe shape, and is provided so as to be rotatable up and down around a shaft 18, and a suction port 19 is provided at the tip side thereof. An appropriate negative pressure source is connected to the upper thread catching and guiding means 20 and the lower thread catching and guiding means 17 so as to cause the mouse 22 and the suction port 19 at the tip to generate a suction action.

  The above is the configuration of the automatic winder 1, and the yarn length measuring device 60 that measures the winding length YL from the beginning of winding of the yarn 4 in the yarn winding unit 2 of the automatic winder 1 includes the package rotation sensor 43 and the package described above. It includes at least a diameter sensor 44, a traverse guide position sensor 47, a traverse control unit 46, and the like.

Next, the yarn length measuring function in the yarn length measuring device 60 will be described. The traverse control unit 46 constituting the yarn length measuring device 60 is configured as a microcomputer, and includes a CPU 70 as a calculation means, a RAM 71 as a storage means, a timer circuit 72, and the like. The CPU 70 includes a yarn layer circumferential surface movement distance calculation means 73, a traverse movement distance calculation means 74, and a winding length calculation means 75. The yarn layer circumferential surface movement distance calculating unit 73 is a constituent element of the yarn layer circumferential surface movement distance detecting unit, and based on the detection result from the package rotation sensor 43 and the detection result from the package diameter sensor 44, a predetermined sampling cycle time Ts. The movement distance ΔPLs of the yarn layer peripheral surface is calculated for each. The traverse movement distance calculation means 74 is a component of the traverse movement distance detection means, and calculates the traverse movement distance ΔTLs for each predetermined sampling period time Ts from the detection result of the traverse guide position sensor 47. The winding length calculating means 75 includes a yarn layer peripheral surface moving distance ΔPLs detected by the yarn layer peripheral surface moving distance calculating unit 73 every predetermined sampling cycle time Ts and a traverse moving distance calculating unit 74 having a predetermined sampling cycle time. The traverse movement distance ΔTLs detected for each Ts is inputted, and the yarn wound around the take-up bobbins 6 and 7 every predetermined cycle time Ts from the inputted yarn layer peripheral surface movement distance ΔPLs and the traverse movement distance ΔTLs. 4 to calculate the winding length of the yarn 4 wound around the winding bobbins 6 and 7 by calculating the winding length calculated every predetermined time Ts from the beginning of winding. It is. Then, the CPU 70 of the traverse control unit 46 determines the movement distance ΔPLs of the circumferential surface of the yarn layer wound around the winding bobbins 6 and 7 and the movement distance ΔTLs of the traverse guide 11 for each predetermined sampling cycle time Ts. Is calculated. The sampling cycle time Ts is a minute time that is sufficiently shorter than the time required for the traverse guide 11 to move by one traverse stroke. The shorter the sampling cycle time Ts, the better. The

  Specifically, in the present embodiment, the package diameter sensor 44 detects the diameter of the package 7 at appropriate time intervals, and the detected diameter is transmitted to the unit controller 50. When the unit controller 50 receives the signal of the diameter of the package 7, it transfers it to the traverse controller 46. The package rotation sensor 43 detects the rotation angle of the take-up bobbins 6 and 7 (the rotation speed of the take-up bobbins 6 and 7) at appropriate time intervals, and transmits the detected rotation angle to the traverse control unit 46. Is done.

  As described above, the traverse control unit 46 can acquire the diameter of the package (yarn layer) and the rotation speed of the winding bobbins 6 and 7, and based on this, the yarn layer circumferential surface moving distance calculating means 73 of the traverse control unit 46. Calculates the movement distance ΔPLs of the circumferential surface of the yarn layer at the sampling cycle time Ts according to the following equation. That is, assuming that the diameter of the package 7 is D (meter), the rotation speed of the winding bobbins 6 and 7 is B (rpm), and the cycle time is Ts (s), ΔPLs = (π × D × B × Ts) / 60 It is.

  At the same time, the traverse guide position sensor 47 is configured to transmit, as the position signal, a number of pulse signals corresponding to the travel distance of the traverse guide 11 to the traverse control unit 46 at appropriate time intervals. Then, the traverse moving distance calculating means 74 of the traverse control unit 46 obtains a difference between the number of the pulse signals input this time and the number of pulse signals input before the sampling cycle time Ts, and adds one pulse to this. By multiplying the per-distance, the travel distance ΔTLs of the traverse guide 11 in the sampling cycle time Ts is calculated and acquired. That is, if the number of pulses in the current sampling is Cc (number), the number of pulses in the previous sampling is Cp (number), and the distance per pulse is ΔLp (meters), ΔTLs = | Cc−Cp | × ΔLp. .

  Then, the winding length calculation means 75 of the traverse control unit 46 accumulates the values of ΔPLs and ΔTLs obtained by the above calculation for a predetermined cycle time (calculation cycle time) Tc. The obtained integrated values ΔPL and ΔTL are ΔPL = ΣΔPLs and ΔTL = ΣΔTLs, respectively. The calculation cycle time Tc is set to be longer than the sampling cycle time Ts.

When the calculation cycle time Tc elapses, the winding length calculation means 75 of the traverse control unit 46 determines the length ΔYL of the yarn 4 wound during the calculation cycle time Tc as the integrated value ΔPL. , ΔTL, and according to the equation of the three square theorem. That is, assuming that the length of the yarn wound during the calculation cycle time Tc is ΔYL (meter), ΔYL = √ (ΔPL ² + ΔTL ² ).

That is, as shown in FIG. 2, the vector (ΔYL) representing the winding length of the yarn at a sufficiently short time Tc is perpendicular to the vector (ΔPL) of the component in the moving direction of the circumferential surface of the yarn layer. This is expressed as a vector sum of the vectors (ΔTL) of components of a traverse movement. Therefore, the relationship ΔYL = √ (ΔPL ² + ΔTL ² ) is established. 2 is a twill angle.

  In the present embodiment, since the traverse guide 11 is provided at the tip of the arm member 13 that is pivotally driven, strictly speaking, the traverse guide 11 moves along an arcuate trajectory instead of a linear trajectory. In this regard, in the present embodiment, the above calculation formula is applied on the assumption that the length of the arm member 13 is sufficiently long and that the traverse guide 11 performs a linear motion approximately. However, the approximation is not limited to the above approximation, and the component of the moving distance ΔTL of the traverse guide 11 in the width direction of the yarn layer (the component distance substantially contributing to the traverse motion of the yarn 4) ΔTL ′ is a trigonometric function. May be used, and ΔYL may be calculated from the equation of the above three-square theorem using the distance ΔTL ′ thus obtained.

  As described above, when the winding length ΔYL for each calculation cycle time Tc is obtained by calculation, the winding length calculation means 75 of the traverse control unit 46 starts winding from the winding bobbins 6 and 7. Is obtained as an integrated value. That is, YL = ΣΔYL. Then, the winding length calculation means 75 of the traverse control unit 46 resets the integrated values ΔPL and ΔTL to zero, shifts to processing at the next calculation cycle time Tc, and repeats the same processing as described above. To do.

  The winding length calculating means 75 of the traverse control unit 46 repeats the above calculation every calculation cycle time Tc and updates the value of the winding length YL from the beginning of winding. As the winding progresses, the winding length YL increases every moment. When the value of the winding length YL reaches a preset predetermined length, the winding length calculation means 75 determines that the winding is full and sends a full winding signal to the unit controller 50. Then, the unit control unit 50 sends a stop signal to the package drive control unit 42 and the traverse control unit 46 to stop the package drive motor 41 and the traverse drive motor 45, and winds the yarn 4 onto the take-up bobbins 6 and 7. While stopping, a doffing device (not shown) performs an appropriate doffing operation. Thereafter, the operation of the package drive motor 41 and the traverse drive motor 45 is restarted via the package drive control unit 42 and the traverse control unit 46, and the yarn 4 is wound around the new winding bobbin (winding tube) 6 again. Of course, when the yarn is wound around the new winding bobbin 6, the measured value of the winding length YL is reset to zero.

  As described above, the yarn length measuring device 60 according to the present embodiment has the movement distance ΔPLs of the circumferential surface of the yarn layer wound around the winding bobbins 6 and 7 and the traverse at a predetermined sampling cycle time Ts. A winding length calculation means 75 is provided which calculates a winding length ΔYLs of the yarn 4 at the sampling cycle time Ts from the moving distance ΔTLs of the guide 11. Then, the winding length calculation means 75 calculates the winding length YL of the yarn 4 from the beginning of winding by integrating the winding length ΔYLs obtained repeatedly every sampling cycle time Ts. It is configured.

  Accordingly, in the yarn winding device in which the rotation driving of the winding bobbins 6 and 7 and the driving of the traverse guide 11 are performed independently, the yarn length in consideration of the rotation direction component and the traverse direction component of the winding bobbins 6 and 7 respectively. Since the measurement can be performed, the measurement accuracy of the yarn length is extremely good, and the shortage of the yarn winding amount and the waste of the yarn can be surely prevented.

  Further, the period time Ts for which the winding length calculating means 75 of the traverse control unit 46 calculates the winding length ΔYLs is shorter than the time required for the traverse guide 11 to move by one traverse stroke ( It is set to a sufficiently short moment time). Therefore, the traverse guide 11 decelerates toward the end of the traverse stroke, stops for a moment at that end, and then accelerates toward the end of the traverse stroke on the opposite side (in other words, influence of the reciprocating motion of the traverse guide 11 (in other words, Then, the value of the winding length YL can be obtained while finely reflecting (change in ΔTLs). Therefore, the accuracy of yarn length measurement can be greatly improved. Similarly, it is possible to easily cope with changes in the winding bobbin rotation speed and traverse movement speed.

  Further, the yarn winding unit 2 of the automatic winder 1 of the present embodiment includes a package diameter sensor 44 that detects the diameter of the yarn layer and a package rotation sensor 43 that detects the rotation angle of the yarn layer. Then, the winding length calculating means 75 of the traverse control unit 46 moves the circumferential distance of the yarn layer in the sampling cycle time Ts from the detection value of the package diameter sensor 44 and the detection value of the package rotation sensor 43. ΔPLs is obtained by calculation. It is possible to obtain the movement distance ΔPLs of the peripheral surface even with a method in which a rotation sensor is attached to the contact roller 9, but in this method, slippage may occur between the yarn layer and the contact roller 9. Long measurements are likely to be inaccurate. In this respect, in the present embodiment, the yarn length can be accurately measured by configuring the yarn layer circumferential surface moving distance detection means with the package diameter sensor 44 and the package rotation sensor 43 as described above.

  In the present embodiment, the traverse device 5 includes a traverse guide 11 that is driven to move the yarn 4 in the traverse direction, and a traverse drive motor 45 that drives the traverse guide 11, and this traverse drive motor The rotation angle of 45 and the moving distance of the traverse guide 11 are in a proportional relationship. The traverse guide position sensor 47 is configured to detect the rotation angle of the traverse drive motor 45. Therefore, the movement distance ΔTLs of the traverse guide 11 can be accurately detected with a simple configuration.

  In the present embodiment, the package diameter sensor 44 is configured to be able to detect the yarn layer diameter even when the winding of the yarn 4 is stopped. Therefore, even when the winding bobbins 6 and 7 are rotating at a low speed immediately after starting winding of the yarn onto the empty winding bobbin or immediately after resuming winding after yarn joining, the yarn is detected by the package diameter sensor 44. The layer diameter can be measured, and the yarn length can be measured accurately.

  For example, instead of omitting the package diameter sensor 44, a rotation sensor can be attached to the contact roller 9, and the thread layer diameter can be calculated by the CPU 70 or the like from the pulse signal of the rotation sensor and the pulse signal of the package rotation sensor 43. is there. However, when calculating the yarn layer diameter from the relationship between the rotational speeds as described above, the number of pulses per unit time is small when the winding bobbin immediately after the start of winding of the yarn is rotating at a low speed. Arithmetic processing becomes difficult. In this regard, in the configuration of the present embodiment, the yarn layer diameter can be accurately acquired by the package diameter sensor 44 even when the take-up bobbin rotates at a low speed, so that the yarn length can be accurately measured. In particular, in the yarn winding unit 2 of the automatic winder 1 as in this embodiment, every time the yarn clearer 15 detects a yarn defect, the winding bobbins 6 and 7 stop rotating, and the yarn defect is removed to remove the yarn defect. Since the operation of resuming the rotation of the winding bobbins 6 and 7 is repeated after the yarn splicing by 14, it is advantageous to employ the package diameter sensor 44 capable of detecting the yarn layer diameter even when the winding bobbin is stopped as described above. .

  Further, the yarn winding unit 2 of the automatic winder 1 of the present embodiment causes the winding to occur when the winding length YL from the winding start measured by the yarn length measuring device 60 reaches a preset length. The winding to the bobbins 6 and 7 is stopped. This makes it possible to perform constant-length winding while accurately measuring the winding length YL of the yarn 4, forming a package 7 with insufficient winding amount of the yarn 4, or forming the yarn 4 in the package 7. It is possible to prevent the thread 4 from being wasted excessively.

  The configuration disclosed above is an example, and can be changed as follows, for example.

  The traverse device 5 has an endless timing belt 31 disposed in the vicinity of the contact roller 9 as shown in FIG. 3 instead of a configuration in which the arm member 13 is reciprocally driven by a traverse drive motor 45 configured as a voice coil motor. In addition, the traverse guide 11 ′ is attached to the timing belt 31, and the timing belt 31 can be changed to a configuration in which the timing belt 31 is reciprocated by a traverse drive motor 45 ′ as a pulse motor, for example. In addition, it is possible to change to a traverse device having another configuration such as a configuration in which a cam groove is spirally formed on the outer peripheral surface of the drum-shaped traverse cam and a traverse guide is engaged with the cam groove.

  The diameter signal detected by the package diameter sensor 44 can be changed to a configuration that is directly input to the traverse control unit 46 instead of the configuration that is transferred to the traverse control unit 46 via the unit control unit 50. Further, the traverse control unit 46 and / or the package drive control unit 42 may be incorporated in the unit control unit 50.

The yarn winding length (ΔYLs , ΔYL, YL) can be changed to a configuration in which, for example, the unit control unit 50 calculates without calculating by the traverse control unit 46.

The schematic front view and block diagram of a yarn winding unit of an automatic winder according to an embodiment of the present invention. The principal part perspective view explaining the calculation of the winding length ΔYLs of the yarn at the sampling cycle time Ts. The schematic front view and block diagram which show the modification of a traverse apparatus.

Explanation of symbols

1 Automatic winder 2 Yarn winding unit (yarn winding device)
4 Thread 5 Traverse device 6 Winding tube (empty winding bobbin)
7 Package (winding bobbin with thread layer)
11 Traverse guide 41 Package drive motor (winding bobbin rotation drive device)
43 Package rotation sensor (winding bobbin rotation angle sensor)
44 Package diameter sensor (yarn layer diameter sensor)
46 Traverse Control Unit 47 Traverse Guide Position Sensor 50 Unit Control Unit 60 Yarn Length Measuring Device 73 Yarn Layer Surface Movement Distance Calculation Unit 74 Traverse Movement Distance Calculation Unit 75 Winding Length Calculation Unit

Claims (5)

A take-up bobbin rotation drive device for rotationally driving a take-up bobbin for winding the yarn and the take-up bobbin rotation drive device are separated from each other and driven to wind the yarn onto the take-up bobbin. A yarn length measuring device for measuring a winding length of a yarn wound around the winding bobbin in a yarn winding device provided with a traverse device for traversing the yarn,
Means for detecting a thread layer peripheral surface movement distance in a circumferential direction of a peripheral surface of a thread layer formed by winding a thread on the winding bobbin for each predetermined sampling period time ;
Means for detecting the traverse movement distance of the yarn in the width direction of the yarn layer for each predetermined sampling period time ;
Each input predetermined yarn layer peripheral surface movement distance is detected for each sampling period time and the detected traverse movement distance for each predetermined sampling period time the traverse movement distance detecting means by said yarn layer peripheral surface movement distance detecting means and, from the input yarn layer peripheral surface movement distance and the traverse movement distance, and the winding length of the wound yarn previously Kimakito bobbin determined Mel winding length computing means,
A yarn length measuring device for a yarn winding device. The yarn length measuring device of the yarn winding device according to claim 1, wherein the predetermined sampling cycle time is an instantaneous time.   The yarn length measuring device for the yarn winding device according to claim 1 or 2, wherein the traverse device is driven to move the yarn in the traverse direction, and drives the traverse guide. Drive motor, the rotation angle of the drive motor and the movement distance of the traverse guide maintain a predetermined relationship, and the traverse movement distance detecting means detects the rotation angle of the drive motor. A yarn length measuring device for a yarn winding device.   The yarn length measuring device for a yarn winding device according to any one of claims 1 to 3, wherein the yarn layer peripheral surface moving distance detecting means detects a diameter of the yarn layer. A sensor and a winding bobbin rotation angle sensor for detecting a rotation angle of the winding bobbin, and obtaining the yarn layer peripheral surface moving distance from the detection result of the yarn layer diameter sensor and the winding bobbin rotation angle sensor A yarn length measuring device for a yarn winding device.   The yarn length measuring device for a yarn winding device according to claim 4, wherein the yarn layer diameter sensor is capable of detecting the yarn layer diameter in a state where the winding of the yarn is stopped. A yarn length measuring device for a yarn winding device.

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