CN108975070B - Yarn monitoring device, yarn winding machine, and yarn monitoring method - Google Patents

Abstract

A yarn monitoring device (34) includes a yarn unevenness detecting sensor (37) and a yarn monitoring control unit (81). A yarn unevenness sensor (37) monitors the yarn wound by the automatic winder. A yarn monitoring control unit (81) determines the information on the traverse position of the yarn based on the information obtained from the yarn unevenness detecting sensor (37) and the information on the traverse position of the yarn obtained from a yarn detecting sensor (71) provided in the automatic winder, and outputs a cutter operation signal for operating the cutter (39). The yarn monitoring device (34) also has a yarn detection input unit (83) that inputs the yarn detection signal output by the yarn detection sensor (71).

Description

Yarn monitoring device, yarn winding machine, and yarn monitoring method

The present invention is a divisional application with the name of "yarn monitoring device and yarn winding machine" in chinese patent application No. 201310251904.7 filed 24/6/2013 by the present applicant.

Technical Field

The present invention relates generally to a yarn monitoring device for monitoring a running yarn in a yarn winding machine.

Background

Conventionally, a yarn winding machine such as an automatic winder or a spinning machine has been known to have a structure of a yarn monitoring device for monitoring the thickness of a running yarn. Such a yarn monitoring device is disclosed in japanese patent laid-open publication No. 2009-190841 (patent document 1).

In patent document 1, a yarn clearer as a yarn monitoring device is provided in an automatic winder that winds a yarn unwound from a yarn supplying bobbin around a winding bobbin while traversing the yarn to form a package. The automatic winder includes a winding drum for traversing a yarn and driving a winding bobbin.

The yarn clearer of patent document 1 includes: a yarn removing head having a yarn unevenness sensor for detecting the thickness of the yarn; and an analyzer for processing the signal from the yarn unevenness detecting sensor to detect the yarn defect. The winding drum is provided with a rotation sensor that detects rotation of the winding drum and transmits information on the traveling speed of the yarn to an analyzer. The automatic winder includes a cutter that cuts the yarn immediately when a yarn defect is detected.

In the automatic winder disclosed in patent document 1, the yarn is simply cut at the timing when the yarn unevenness detecting sensor detects a yarn defect. However, with such control, there is a possibility that a phenomenon of jumping (end face falling) in which the trajectory of the yarn exceeds the winding width of the package occurs due to a difference in the traverse position of the yarn at the time of cutting, and this may cause a defective package.

Disclosure of Invention

The invention aims to provide a yarn monitoring device which can judge and control in real time based on various information besides the thickness of a yarn.

According to a first aspect of the present invention, a yarn monitoring device includes a sensor and a determination unit. The sensor monitors the yarn wound by the yarn winding machine. The determination unit determines based on first information obtained from the sensor and second information obtained from a state acquisition unit provided in the yarn winding machine, and outputs a control signal. The determination unit performs the determination based on the tension of the yarn in the yarn winding machine as the second information acquired by the state acquisition unit, and detects an abnormality in the yarn count.

Thus, the yarn monitoring device can accurately monitor and control the yarn based on not only the first information obtained from the sensor but also the second information obtained from the state obtaining unit. Further, since the second information can be input to the yarn monitoring device with a small time lag and the determination can be made by the yarn monitoring device itself, even when the winding speed in the yarn winding machine is high or when the second information that can change in a very short time is used, appropriate determination and control at an accurate timing can be performed.

In the above-described yarn monitoring device, it is preferable that the yarn monitoring device includes an input unit that directly inputs the second information output from the state acquisition unit.

Thus, the second information can be appropriately input from the state acquisition unit. Further, since the second information can be directly input, it is possible to perform determination and control with high real-time performance.

In the yarn monitoring device, it is preferable that the input unit is at least one of a communication input unit that acquires the second information output from the state acquisition unit by digital communication, an analog value input unit that acquires the second information output from the state acquisition unit in an analog value format, and a 2-value input unit that acquires the second information output from the state acquisition unit in a 2-value format.

This makes it possible to appropriately acquire the second information from the state acquisition unit in accordance with the output format.

The yarn monitoring device includes a cutter for cutting the yarn. The determination unit outputs a signal for operating the cutter as the control signal.

Thus, even if the monitored yarn is wound at a high speed, the yarn can be cut by the cutter at a desired and accurate timing.

The second information is a traverse position of the yarn. The determination unit outputs the control signal when the first information indicates that the yarn includes a yarn defect and the second information indicates that the yarn is in the middle of the traverse stroke from the end to the center.

The second information is a tension of the yarn. The determination unit outputs the control signal when the second information indicates that the detected value of the yarn tension is lower than a predetermined tension threshold value, or when the second information indicates that the detected value of the yarn tension is normal but the first information indicates that the detected thickness of the yarn is smaller than a predetermined thickness threshold value, or when the second information indicates that the detected value of the yarn tension is higher than the predetermined tension threshold value but the first information indicates that the detected thickness of the yarn is not smaller than the predetermined thickness threshold value.

The first information is the thickness of the yarn. The second information is a state of pile of the yarn or a position of the unwinding assisting member of the unwinding assisting device. The judging unit outputs the control signal when the first information indicates that the yarn includes a yarn defect. And changing a threshold value of the yarn thickness, which is a threshold value for detecting the yarn defect, based on the second information.

The yarn monitoring device includes a housing that houses the sensor and the determination unit.

According to a second aspect of the present invention, a yarn winding machine includes the yarn monitoring device and a winding unit that winds the yarn monitored by the yarn monitoring device into a package.

This enables the yarn winding machine to achieve the advantageous effects described above.

The yarn winding machine includes a yarn winding unit and a unit control unit. The yarn winding unit includes the winding unit. The unit control unit controls the yarn winding unit. The second information output from the state acquiring unit is input to the yarn monitoring device and the unit control unit, respectively.

Thus, the second information can be effectively used for both the monitoring of the yarn and the control of the yarn winding unit.

According to a third aspect of the present invention, a yarn monitoring method includes the steps of: monitoring the yarn wound by the yarn winder by a sensor; and a control unit configured to perform a determination based on first information obtained from the sensor and second information obtained from a state acquisition unit provided in the yarn winding machine, and output a control signal, wherein the determination is performed based on a tension of the yarn in the yarn winding machine as the second information obtained by the state acquisition unit, thereby detecting an abnormality in the yarn count.

Drawings

Fig. 1 is a front view showing an overall configuration of an automatic winder according to an embodiment of the present invention.

Fig. 2 is a front view of the winder unit.

Fig. 3 is a perspective view of the tension sensor.

Fig. 4 is a functional block diagram showing an electrical configuration of the winder unit.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in fig. 1, an automatic winder (yarn winding machine) 1 according to an embodiment of the present invention includes a plurality of winder units (yarn winding units) 10 arranged in an array, and a machine body controller 11 arranged at one end in the array direction.

The body control unit 11 includes a display device 12 capable of displaying information on each winder unit 10, an instruction input unit 13 for an operator to input various instructions to the body control unit 11, and the like. The operator of the automatic winder 1 can collectively manage the plurality of winder units 10 in the machine body control unit 11 by checking various information displayed on the display device 12 and appropriately operating the instruction input unit 13.

Each winder unit 10 unwinds the yarn 21 from the yarn supplying bobbin 20 and further unwinds the yarn to the winding bobbin 22. The bobbin in which the yarn 21 is wound around the winding tube 22 is referred to as a package 23. In the following description, the terms "upstream side" and "downstream side" refer to the upstream side and the downstream side as viewed in the traveling direction of the yarn 21.

As shown in fig. 2, the winder unit 10 includes a main body frame 24, a yarn feeder 25, and a winding unit 26.

The main body frame 24 is disposed on the side of the winder unit 10. Most of the structure of the winder unit 10 is supported directly or indirectly by the main body frame 24.

The yarn feeding portion 25 can hold the yarn feeding bobbin 20 for feeding the yarn 21 in a substantially upright state. The winding unit 26 includes a cradle 28 and a winding drum 29.

The cradle 28 rotatably supports the take-up tube 22. The cradle 28 can bring the outer peripheral surface of the supported winding tube 22 into contact with the outer peripheral surface of the winding drum 29. The take-up drum 29 is disposed opposite the take-up tube 22 and is driven to rotate by a drum drive motor 53.

A traverse groove 27 is formed in a reciprocating spiral shape on the outer peripheral surface of the winding drum 29 so as to traverse (traverse) the yarn 21 wound around the winding tube 22. The take-up drum 29 is coupled to an output shaft of a drum drive motor 53, and is driven to rotate by the drum drive motor 53. By driving and rotating the winding drum 29 in a state where the yarn 21 is introduced into the traverse groove 27, the package 23 in contact with the winding drum 29 is driven and rotated, and the yarn 21 can be wound around the outer peripheral surface of the package 23 while being traversed. Thereby, a yarn layer is formed on the surface of the package 23 step by step.

A drum rotation detection sensor 73 is disposed near the winding drum 29. The drum rotation detection sensor 73 is electrically connected to the unit control unit 30 that controls each part of the winder unit 10. The drum rotation detection sensor 73 is configured as, for example, a rotary encoder, and outputs a rotation pulse signal (hereinafter, may be referred to as a drum pulse signal) to the unit control unit 30 every time the winding drum 29 rotates by a predetermined angle. The unit control section 30 can acquire the rotation speed of the winding drum 29 (and hence the traveling speed of the yarn 21) by measuring the number of pulses per predetermined time.

The winding drum 29 is driven to rotate in a state where the outer peripheral surface of the winding tube 22 is in contact with the winding drum 29, so that the winding tube 22 is driven to rotate. Accordingly, the yarn 21 unwound from the yarn feeding bobbin 20 can be traversed by the traverse groove 27, and the yarn 21 can be wound around the winding bobbin 22. The configuration for traversing the yarn 21 is not limited to the winding drum 29 described above, and may be an arm-type traverse device that guides the yarn 21 by a traverse guide that is driven to reciprocate with a predetermined traverse width, for example.

Each winder unit 10 has a unit control unit 30. The unit control section 30 includes hardware such as a Central Processing Unit (CPU), a Read Only Memory (ROM), and a Random Access Memory (RAM), and software such as a control program stored in the RAM. The respective configurations of the winder unit 10 are controlled by the above-described hardware and software cooperating. The unit control unit 30 of each winder unit 10 can communicate with the body control unit 11. This enables the body control unit 11 to centrally manage the operation of each winder unit 10.

In the winder unit 10, an unwinding assisting device 31, a tension applying device 32, a tension sensor 60, a yarn splicing device 33, and a yarn monitoring device 34 are arranged in this order from the upstream side in a yarn running path between the yarn supplying section 25 and the winding section 26.

The unwinding assisting device 31 has a regulating portion 35 that comes into contact with a portion (balloon) of the yarn 21 unwound from the yarn supplying bobbin 20 that bulges outward due to centrifugal force oscillation. By bringing the regulating portion 35 into contact with the balloon, excessive waving of the yarn 21 is suppressed, and the balloon is ensured to have a constant size. This allows the yarn 21 to be unwound from the yarn supplying bobbin 20 with a constant tension. In addition, the details of the structure of the unwinding assisting device 31 are described later.

The tension applying device 32 applies a predetermined tension to the running yarn 21. The tension applying device 32 of the present embodiment has a gate-type structure in which movable comb teeth are arranged with respect to fixed comb teeth. The yarn 21 is passed through the comb teeth while being bent between the engaged comb teeth, thereby applying an appropriate tension to the yarn 21. The tension applying device 32 may be of a disk type, for example, in addition to the gate type.

The tension sensor 60 is configured as a load cell type sensor. The tension sensor 60 measures the tension of the yarn 21 traveling along the yarn path and outputs an electric signal corresponding to the tension. Further, details of the structure of the tension sensor 60 will be described later.

The yarn splicing device 33 splices the lower yarn on the yarn supplying bobbin 20 side and the upper yarn on the package 23 side when the yarn 21 between the yarn supplying bobbin 20 and the package 23 is in a disconnected state for some reason. In the present embodiment, the yarn splicing device 33 is configured as a splicing device that splices yarn ends together by a flow of whirling air generated by compressed air. The splicing device 33 is not limited to the splicing device described above, and a mechanical knotter or the like may be used, for example.

In the height direction of the winder unit 10, a lower yarn catching member 54 that catches and guides the yarn (lower yarn) on the yarn supply bobbin 20 side is provided below the yarn splicing device 33, and an upper yarn catching member 55 that catches and guides the yarn (upper yarn) on the package 23 side is provided above the yarn splicing device 33. The lower yarn catching member 54 includes a lower yarn catching tube 56 connected to a negative pressure source not shown in the figure and a suction port 57 at the tip end. The upper yarn catching member 55 includes an upper yarn catching tube 58 connected to a negative pressure source not shown in the figure and a suction nozzle 59 at the tip. With this configuration, the suction port 57 and the suction nozzle 59 can be operated with suction flow. The root portions of the lower yarn catching tube 56 and the upper yarn catching tube 58 are rotatably supported, and thus the catching tubes can be rotated in the vertical direction.

When the yarn 21 is in the cut state between the yarn feeding bobbin 20 and the package 23, the lower yarn on the yarn feeding bobbin 20 side is caught by the lower yarn catching member 54 and is then introduced into the yarn splicing device 33, and the upper yarn on the package 23 side is caught by the upper yarn catching member 55 and is then introduced into the yarn splicing device 33. In this state, the yarn splicing device 33 is driven to splice the upper yarn and the lower yarn so that the yarn 21 is continuously fed between the yarn feeding bobbin 20 and the package 23. This can resume winding of the yarn 21 into the package 23.

The yarn monitoring device 34 monitors the quality of the running yarn 21 by an optical yarn unevenness detecting sensor 37 having a light source and a light receiving element (not shown) and detects a yarn defect (a portion where an abnormality exists in the yarn 21) included in the yarn 21. A cutter 39 for cutting the yarn 21 when the yarn monitor 34 detects a yarn defect is provided in the vicinity of the yarn monitor 34. The cutter 39 includes a cutting blade and a solenoid, not shown, and can cut the yarn 21 by driving the cutting blade by energizing the solenoid.

Next, the unwinding assisting device 31 will be described in detail. The regulating portion 35 of the unwinding assisting device 31 includes a fixed tube 41 and a movable tube (unwinding assisting member) 42. The fixed tube 41 is in contact with the balloon of the yarn 21 in a state of being fixed to the main body frame 24. The movable drum 42 moves as the yarn 21 unwinds from the yarn supply bobbin 20 and comes into contact with the balloon of the yarn 21. Both the fixed cylinder 41 and the movable cylinder 42 are formed in a cylindrical shape having at least vertical shaft holes.

An inverted U-shaped support arm 43 is fixed to the movable tube 42. A bobbin yarn upper tapered surface (chase) portion detection sensor 44 for detecting a tapered surface portion of the yarn feeding bobbin 20 is attached to the support arm 43. The tapered surface portion is a yarn layer end portion of the yarn supplying bobbin 20 that moves as the winding operation proceeds. The tapered surface portion detection sensor 44 is configured as an optical sensor having a light projecting portion and a light receiving portion, and the light projecting portion and the light receiving portion are arranged to face each other with the yarn feeding bobbin 20 interposed therebetween.

The unwinding assisting device 31 has a lifting mechanism 45 for lifting and lowering the movable tube 42. The lifting mechanism 45 includes a screw member 46 disposed in the vertical direction, a lifting guide member 47 disposed parallel to the screw member 46, and a slider 48 guided by the lifting guide member 47.

The screw member 46 is rotatably supported, and the slider 48 is screwed to the screw member 46. The movable tube 42 is fixed to the slider 48 via the support arm 43. The lifting mechanism 45 has a lifting motor 50 for driving the screw member 46 to rotate, and an output shaft of the lifting motor 50 is coupled to the screw member 46 via a belt member. The lift motor 50 can be, for example, a stepping motor.

The movable cylinder 42 can be moved up and down together with the slider 48 by rotating the screw 46 around the axis by rotating the elevation motor 50 in either of the forward and reverse directions.

The unwinding assisting device 31 has an unwinding assisting control part 51 for controlling the unwinding assisting device 31. The unwinding assisting control section 51 includes a drive substrate for driving the lifting motor 50, and a communication control section for performing digital communication between the power supply, the yarn monitoring device 34, and the unit control section 30. The unwinding assist control unit 51 is electrically connected to the lifting motor 50 via a wiring not shown. The unwinding assisting control unit 51 and the tapered surface detection sensor 44 are electrically connected via a wiring, not shown.

The unwinding assisting device 31 of the above-described structure assists the unwinding of the yarn 21 from the yarn supplying bobbin 20. Specifically, when the yarn 21 is unwound from the yarn supplying bobbin 20, the height of the tapered surface portion of the yarn supplying bobbin 20 gradually decreases as the yarn layer is disassembled. When the tapered surface portion detection sensor 44 detects the lowering of the tapered surface portion, it outputs a detection signal to the unwinding assisting control unit 51. Then, the unwinding assisting control unit 51 that receives the detection signal drives the lifting motor 50 of the lifting mechanism 45 to lower the slider 48 so that the movable tube 42 is lowered in accordance with the height change of the tapered surface portion. Such lowering of the slider 48 in conjunction with the height change of the tapered surface portion is repeated from the first full amount of the yarn 21 wound on the yarn feeding bobbin 20 to the reduction to about 1/3.

As described above, the height of the movable tube 42 (and hence the tapered surface portion detection sensor 44) is controlled to be raised and lowered by the raising and lowering motor 50 constituted by a stepping motor. Therefore, the unwinding assist control unit 51 that controls the elevation motor 50 can acquire the height of the movable tube 42 (the tapered surface portion detection sensor 44) based on the control content of the unwinding assist control unit 51 itself. The unwinding auxiliary control unit 51 is electrically connected to the unit control unit 30 and can transmit and receive signals. The unwinding assist control unit 51 is electrically connected to the yarn monitoring device 34, and can output a signal to the yarn monitoring device 34. The unwinding assist control unit 51 outputs the obtained height of the movable tube 42 to the unit control unit 30 and also to the yarn monitoring device 34.

Next, a specific structure of the tension sensor 60 will be described. As shown in fig. 3, the tension sensor 60 includes a deforming member 61 formed of metal or the like into a substantially U shape. One end of the deforming member 61 is fixed to the winder unit 10 side, and a rotatable small pulley-like contact guide 62 is supported by the other end of the deforming member 61. The deformation member 61 has a load converter 63, and a strain gauge 64 is provided on the surface of the load converter 63 by printing, for example. The strain gauge 64 is electrically connected to the cell control unit 30 and the yarn monitoring device 34 via a wiring not shown.

When the yarn 21 is guided and travels in the track in such a manner as to be pressed against the contact guide 62, a deformation is generated in the load transducer portion 63 in accordance with the tension of the yarn 21, and an electric signal corresponding to the deformation is output from the strain gauge 64. Accordingly, the tension sensor 60 can detect the tension of the yarn 21.

Next, the yarn guide 70 for guiding the yarn 21 traversed by the winding drum 29 will be described. As shown in fig. 2, the yarn guide 70 is, for example, a plate-like body made of a metal material, and is formed in a trapezoidal shape so as to surround the track of the traversing yarn 21.

A yarn detection sensor 71 is attached to an appropriate position of the yarn guide 70. The yarn detection sensor 71 is configured as an optical sensor having a light projecting portion and a light receiving portion, and is capable of detecting the presence or absence of the yarn 21 in the detection region of the yarn detection sensor 71. The yarn detection sensor 71 is disposed at a position shifted to one end side from the center of a stroke (traverse stroke) in which the yarn 21 is traversed by the traverse groove 27.

As shown in fig. 4, the yarn detection sensor 71 is electrically connected to the unit control section 30 and the yarn monitoring device 34 via a wiring not shown. The unit control section 30 can determine whether the traverse of the yarn 21 is normally performed, specifically, whether the yarn 21 is detected in a predetermined traverse cycle, based on the detection signal of the yarn detection sensor 71. When a yarn defect is detected by a yarn monitoring control section 81 (described later) included in the yarn monitoring device 34, the timing of yarn cutting is controlled in relation to the traverse of the yarn 21 based on the detection signal of the yarn detection sensor 71.

Next, an electrical structure of the yarn monitoring device 34 will be explained. As shown in fig. 4, the yarn monitoring control unit (determination unit) 81 included in the yarn monitoring device 34 includes: a CPU as an arithmetic unit, hardware such as a ROM and a RAM as a storage unit, and software such as a control program stored in the RAM. The hardware and software operate in cooperation with each other to function as a yarn monitoring control unit 81 for controlling the yarn monitoring device 34.

The yarn unevenness detecting sensor 37 is electrically connected to the yarn monitoring and controlling section 81. The yarn thickness unevenness signal (first information) output from the yarn unevenness detecting sensor 37 is input to the yarn monitoring control section 81. The cutter 39 (specifically, a solenoid for driving the cutting blade) is electrically connected to the yarn monitoring and controlling unit 81, and the cutter 39 is operated by a cutter operation signal (control signal) output from the yarn monitoring and controlling unit 81 to cut the yarn 21.

The yarn monitoring device 34 includes: a drum pulse input section 82, a yarn detection input section 83 (input section, 2-value input section), a tension input section (input section, analog value input section) 84, and a movable tube height input section (input section, communication input section) 85, so that signals from the outside are input. The drum pulse signal output from the drum rotation detection sensor 73 is input to the yarn monitoring device 34 via the drum pulse input unit 82. The yarn detection signal output from the yarn detection sensor 71 is input to the yarn monitoring device 34 via the yarn detection input unit 83. The tension signal output from the strain gauge 64 is input to the yarn monitoring device 34 via the tension input portion 84. The movable tube height signal output from the unwinding auxiliary control unit 51 is input to the yarn monitoring device 34 via the movable tube height input unit 85. The information is directly input to the yarn monitoring device 34 from the acquisition sources thereof (the drum rotation detection sensor 73, the yarn detection sensor 71, the strain gauge 64, and the unwinding assisting control unit 51), is stored in the storage unit such as the RAM, and is used for determination and control by the yarn monitoring control unit 81. The information is input to the unit control unit 30 in addition to the yarn monitoring device 34, and is used for control in the unit control unit 30. Of these pieces of information, the information acquired by the yarn detection sensor 71, the strain gauge 64, and the unwinding assisting control section 51 corresponds to the second information of the present invention.

The drum pulse input unit 82 and the yarn detection input unit 83 are configured to acquire the presence or absence of a pulse or the presence or absence of the yarn 21 as 2 values. The tension input section 84 is configured to acquire the tension of the yarn 21 in the form of an analog value. The movable tube height input unit 85 is configured to acquire the height of the movable tube 42 by digital communication with the unwinding assist control unit 51.

In the automatic winder 1, since there is a growing demand for higher winding speed, the yarn monitoring device 34 is required to accurately determine and control even during such high winding speed. As described above, the information of each part is directly input to the yarn monitoring device 34 (without passing through the unit control part 30 or the like). Therefore, the time lag of the signal can be reduced, and high real-time processing can be realized.

The control performed by the yarn monitoring device 34 of the present embodiment will be described below. Three controls are performed by the yarn monitoring control section 81, thereby achieving higher functionality of the yarn monitoring device 34 and higher quality of the package 23.

The first control performed by the yarn monitoring control section 81 is a timing control of yarn cutting at the time of detecting a yarn defect. While the winder unit 10 drives the winding drum 29 to wind the yarn 21, the yarn monitoring control section 81 of the yarn monitoring device 34 monitors the presence or absence of a yarn defect in the yarn 21. For the determination of the presence or absence of the yarn defect, in order to evaluate the degree of the thickness variation (unevenness) of the yarn 21 and the length of the portion where the unevenness occurs, the output signal of the yarn unevenness sensor 37 and the drum pulse signal input from the drum rotation detection sensor 73 are used.

As a result of the yarn monitoring control section 81 monitoring the presence or absence of a yarn defect as described above, it is assumed that a yarn defect is detected. At this time, the yarn monitoring and controlling section 81 immediately stops the operation of the cutter 39, and operates the cutter 39 at a predetermined timing before the traverse position of the yarn 21 is returned from the traverse end to the center side. Specifically, in the yarn guide 70, the yarn 21 passes through the detection region of the yarn detection sensor 71 in the middle of the traverse end where the yarn path moves from the traverse center to one side, and the yarn 21 passes through the detection region of the yarn detection sensor 71 again in the middle of the traverse center after the yarn path is reversed at the traverse end. Therefore, the yarn detection sensor 71 outputs the yarn detection signal twice during one traverse, and the yarn monitoring control section 81 outputs the cutter operation signal at the timing when the second yarn detection signal is input to the yarn monitoring control section 81, so that the cutter 39 is operated to cut the yarn 21.

Thereby, the yarn 21 is cut by the cutter 39 at a predetermined timing while the yarn path is moving from the end to the center of the traverse stroke. Therefore, the yarn 21 can be prevented from flying out from the winding width of the package 23 to the outer end surface due to the cut momentum (end surface falling ち). Since the yarn detection signal output from the yarn detection sensor 71 is directly input to the yarn monitoring device 34 (yarn monitoring control section 81) as described above, even if the yarn 21 is traversed extremely quickly, the yarn 21 can be cut at a correct timing, and the above-described end face separation can be reliably prevented.

The second control by the yarn monitoring control section 81 is a control of detecting an abnormality when the yarn feeding bobbin 20 around which the yarn 21 of an unexpected thickness (a yarn count different from the usual one) is wound is set in the yarn feeding section 25. The yarn monitoring control unit 81 monitors the thickness of the yarn 21 by the yarn unevenness detecting sensor 37 and also monitors the tension signal inputted from the strain gauge 64 of the tension sensor 60. When the tension of the yarn 21 and the thickness of the yarn 21 satisfy any of the conditions (1) to (3) described later, the yarn monitoring and control unit 81 outputs a cutter operation signal to operate the cutter 39 to cut the yarn 21, and transmits a winding stop signal to the unit control unit 30 to stop the winding operation and perform an appropriate warning display. Therefore, in this control, the cutter operation signal and the winding stop signal correspond to the control signal output from the yarn monitoring control unit 81.

The conditions under which the yarn monitoring control unit 81 detects the yarn 21 (yarn feeding bobbin 20) having an unexpected thickness are as follows. (1) The detected value of the tension of the yarn 21 is lower than a predetermined threshold value. (2) If the detected value of the tension of the yarn 21 is normal but the detected thickness of the yarn 21 is smaller than a predetermined threshold value. (3) The detected value of the tension of the yarn 21 is higher than the predetermined threshold value, but the detected thickness of the yarn 21 is not smaller than the predetermined threshold value. When the detected value of the tension of the yarn 21 is larger than a predetermined threshold value, it is estimated that the yarn 21 is thinned. When the detected value of the tension of the yarn 21 is smaller than a predetermined threshold value, it is estimated that the yarn 21 is thickened.

Thus, even when the yarn feeding bobbin 20 of a different yarn count is supplied to the yarn feeding unit 25 for some reason, the yarn monitoring device 34 can detect an abnormality at an early stage and stop the winding operation. In addition, since the tension signal output from the tension sensor 60 is directly input to the yarn monitoring device 34, there is almost no time lag. Therefore, the tension of the yarn 21 that fluctuates at extremely small time intervals can be accurately correlated with the thickness fluctuation of the yarn 21, and the yarn supply bobbin 20 of a yarn count different from the predetermined yarn count can be accurately detected.

The third control performed by the yarn monitor control unit 81 is detection control of a yarn defect in consideration of the state of pile of the yarn 21. When the yarn 21 is unwound from the yarn feeding bobbin 20, it is known that as the remaining amount of the yarn 21 wound around the yarn feeding bobbin 20 decreases, the amount of fluff generated in the yarn 21 increases. When the yarn defect is monitored by the yarn unevenness detecting sensor 37, the yarn monitoring and controlling unit 81 of the present embodiment inputs information on the height of the movable tube 42 of the unwinding assisting device 31 to the yarn monitoring and controlling unit 81. Further, as described above, since the movable tube 42 is controlled to be lowered in accordance with the height of the tapered surface portion of the yarn feeding bobbin 20, the height of the movable tube 42 is linked with the remaining amount of the yarn 21 of the yarn feeding bobbin 20. When the height of the movable tube 42 is low, the threshold value of the yarn thickness for detecting a yarn defect is changed, for example, in consideration of an increase in the fluff generated in the yarn 21. Therefore, in the present control, information on the height of the movable tube 42 is used as information indicating the state of the pile of the yarn 21.

Accordingly, the yarn monitoring device 34 can also detect the yarn defect to be removed with high accuracy based on the tendency of the fluff generated in the yarn 21.

The yarn monitoring device 34 has a housing not shown in the figure that houses the yarn unevenness detecting sensor 37 and the yarn monitoring device 81.

As described above, the yarn monitoring device 34 of the present embodiment includes the yarn unevenness detecting sensor 37 and the yarn monitoring control unit 81. The yarn unevenness sensor 37 monitors the yarn 21 wound by the automatic winder 1 (winder unit 10). The yarn monitoring control unit 81 determines based on the information obtained from the yarn unevenness detecting sensor 37 and the information of the traverse position of the yarn 21 obtained from the yarn detecting sensor 71 included in the winder unit 10, and outputs a cutter operation signal.

The yarn monitoring control unit 81 determines based on the information on the tension of the yarn 21 obtained from the strain gauge 64 of the tension sensor 60 and the information on the height of the movable tube 42 obtained from the unwinding assisting control unit 51, and outputs a cutter operation signal and/or a winding stop signal.

Thus, the yarn monitoring device 34 can monitor the yarn 21 and control the cutter 39 and the like based on the additional information, not only depending on the thickness of the yarn 21. Further, since the information can be input to the yarn monitoring device 34 with a small time lag and the determination can be made by the yarn monitoring device 34 itself (specifically, the CPU of the yarn monitoring device 34), even when the winding speed is high or based on the information that can be changed in a very short time, the yarn monitoring device 34 can perform appropriate determination and control at an appropriate timing.

The yarn monitoring device 34 of the present embodiment has a yarn detection input unit 83 to which a yarn detection signal output from the yarn detection sensor 71 is input.

The yarn monitoring device 34 includes a tension input section 84 to which a tension signal output from the strain gauge 64 of the tension sensor 60 is input, and a movable drum height input section 85 to which a movable drum height signal output from the unwinding assisting control section 51 is input.

This allows information to be appropriately input to the yarn monitoring device 34 from the yarn detection sensor 71 and the like.

In the yarn monitoring device 34 of the present embodiment, the yarn detection input section 83 inputs a 2-value mode into a state of whether or not the traverse position of the yarn 21 is in the detection region of the yarn detection sensor 71.

The tension input section 84 inputs a tension signal output from the strain gauge 64 of the tension sensor 60 in the form of an analog value. The movable drum height input unit 85 acquires the movable drum height signal output from the unwinding assist control unit 51 by digital communication.

Thus, the yarn monitoring device 34 can appropriately acquire information from the yarn detection sensor 71 and the like based on the form of the signal.

The yarn monitoring device 34 of the present embodiment includes a cutter 39 that cuts the yarn 21. The yarn monitoring control section 81 outputs a signal for operating the cutter 39 as a control signal.

Thus, the yarn monitoring device 34 can cut the yarn 21 by the cutter 39 at a desired accurate timing even when the monitored yarn 21 is wound at a high speed.

The automatic winder 1 of the present embodiment includes a yarn monitoring device 34 and a winding unit 26 that winds the yarn 21 monitored by the yarn monitoring device 34 into a package 23.

This enables the yarn winding machine to achieve the advantageous effects described above.

The automatic winder 1 of the present embodiment includes: a winder unit 10 having a winding unit 26, and a unit controller 30 for controlling the winder unit 10. The yarn detection signal (information indicating the traverse position of the yarn 21) output from the yarn detection sensor 71 is input to the yarn monitoring device 34 and the unit control section 30, respectively.

The tension signal output from the strain gauge 64 of the tension sensor 60 is input to the yarn monitoring device 34 and the unit control unit 30, respectively. The movable tube height signal output from the unwinding auxiliary control unit 51 is also input to the yarn monitoring device 34 and the unit control unit 30, respectively.

This makes it possible to effectively utilize the additional information for both monitoring of the yarn 21 and control of the winder unit 10.

While the preferred embodiments of the present invention have been described above, the above-described configuration can be modified as follows, for example.

The yarn unevenness detecting sensor 37 may be configured to be of an optical type as described above, or may be configured to be of a capacitance type that detects the thickness of the yarn 21 based on a change in capacitance.

In the above embodiment, the configuration of the yarn detection sensor 71 and the like is shown as the state acquisition unit, but these configurations are merely examples, and the state acquisition unit may have any configuration as long as it can acquire any information of the tension of the yarn 21, the position of the movable tube 42, the traverse position of the yarn 21, and the state of the pile of the yarn 21.

For example, in the above description, the yarn 21 may be traversed by using a traverse guide that is reciprocally driven instead of the traverse groove 27, and in this case, the detection result of the yarn detection sensor 71 may be changed instead, and the information on the position of the traverse guide may be input to the yarn monitoring device 34. In this case, the package 23 may be directly driven to rotate without rotating the package 23. Instead of the drum pulse, the rotation information (the number of revolutions or the number of revolutions) of the motor that rotates the package 23 may be input to the yarn monitoring device 34.

Instead of acquiring the height of the movable tube 42 based on the control content of the elevation motor 50 by the unwinding auxiliary control unit 51, the height of the movable tube 42 may be acquired by an ultrasonic sensor, for example. Instead of the load converter type, a tension sensor using a spring and/or a piezoelectric element, for example, may be used as the tension sensor 60. Instead of determining the state of the pile of the yarn 21 from the information on the height of the movable tube 42, an optical sensor, for example, for directly measuring the state of the pile of the yarn 21 may be provided, and a signal of the sensor may be input to the yarn monitoring device 34.

The three controls of the yarn monitoring control unit 81 are exemplified, and any of them may be changed or omitted according to the use of the automatic winder 1 or the like. The drum pulse input unit 82 may be omitted.

The control signal output by the yarn monitoring control unit 81 is not limited to the operation signal of the cutter 39 and the winding stop signal, and may be, for example, a signal for turning on a lamp provided in the winder unit 10, a signal for sounding a buzzer, a report signal to be reported to the unit control unit 30 and/or the machine body control unit 11, or the like.

The yarn monitoring device of the present invention can also be installed in other yarn winding machines such as an air spinning frame and a free end spinning frame.

When the yarn monitoring device 34 determines the tension of the yarn 21 of the yarn winding machine as the first information and the second information, the unwinding assisting device 31 (the unwinding assisting member 42) and/or the yarn detecting sensor 71 may be omitted. When the yarn monitoring device 34 determines the first information and the second information based on the position of the unwinding assisting member 42 of the unwinding assisting device 31, the yarn detection sensor 71 and/or the tension sensor 60 may be omitted. When the yarn monitoring device 34 determines the traverse position of the yarn 21 as the first information and the second information, the tension sensor 60 and/or the unwinding assisting device 31 (the unwinding assisting member 42) may be omitted.

Claims (12)

1. A yarn monitoring device is characterized by comprising:

a sensor for monitoring the yarn wound by the yarn winding machine; and

a determination unit for performing determination based on the first information obtained from the sensor and the second information obtained from the state acquisition unit of the yarn winding machine, and outputting a control signal,

the judging section detects an abnormality of the yarn count by performing the judgment based on the tension of the yarn in the yarn winding machine as the second information acquired by the state acquiring section,

when the second information indicates that the detected value of the yarn tension is lower than a predetermined tension threshold value, or,

in a case where the second information indicates that the detected value of the tension of the yarn is normal, but the first information indicates that the detected thickness of the yarn is smaller than a predetermined thickness threshold value, or,

when the second information indicates that the detected value of the yarn tension is higher than the predetermined tension threshold value but the first information indicates that the detected thickness of the yarn is not smaller than the predetermined thickness threshold value,

the judging part outputs the control signal.

2. Yarn monitoring device as in claim 1,

the information processing apparatus includes an input unit that inputs the second information output from the state acquisition unit.

3. Yarn monitoring device as in claim 2,

the input unit is at least one of a communication input unit that acquires the second information output from the state acquisition unit by digital communication, an analog value input unit that acquires the second information output from the state acquisition unit in an analog value format, and a 2-value input unit that acquires the second information output from the state acquisition unit in a 2-value format.

4. Yarn monitoring device as in any one of the claims 1 to 3,

the state acquisition unit includes:

a contact guide member for contacting the yarn; and

and a deformation member supporting the contact guide.

5. Yarn monitoring device as in any one of the claims 1 to 3,

the sensor has a housing for accommodating the sensor and the determination unit.

6. Yarn monitoring device as in claim 4,

the sensor has a housing for accommodating the sensor and the determination unit.

7. A yarn winding machine is characterized by comprising:

a yarn monitoring device as claimed in any one of claims 1 to 6; and

a winding section for winding the yarn monitored by the yarn monitoring device into a package.

8. The yarn winding machine according to claim 7, comprising:

a yarn winding unit having the winding unit; and

a unit control section for controlling the yarn winding unit,

the second information output from the state acquiring unit is input to the yarn monitoring device and the unit control unit, respectively.

9. The yarn winding machine of claim 8,

the yarn winding machine is an air spinning frame.

10. A yarn monitoring method is characterized by comprising the following steps:

monitoring the yarn wound by the yarn winder by a sensor; and

a control unit for outputting a control signal by performing a judgment based on first information obtained from the sensor and second information obtained from a state obtaining unit of the yarn winding machine,

the second information acquired by the state acquiring unit is used for performing the determination based on the tension of the yarn in the yarn winding machine to detect the abnormality of the yarn count,

when the second information indicates that the detected value of the yarn tension is lower than a predetermined tension threshold value, or,

in a case where the second information indicates that the detected value of the tension of the yarn is normal, but the first information indicates that the detected thickness of the yarn is smaller than a predetermined thickness threshold value, or,

when the second information indicates that the detected value of the yarn tension is higher than the predetermined tension threshold value but the first information indicates that the detected thickness of the yarn is not smaller than the predetermined thickness threshold value,

and outputting the control signal.

11. Yarn monitoring method as in claim 10,

the second information output from the state acquisition unit is input through an input unit.

12. Yarn monitoring method as in claim 11,

the input unit is at least one of a communication input unit that acquires the second information output from the state acquisition unit by digital communication, an analog value input unit that acquires the second information output from the state acquisition unit in an analog value format, and a 2-value input unit that acquires the second information output from the state acquisition unit in a 2-value format.

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