JP2009155749A - Spinning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spinning machine capable of carrying out calibration by a pressure detection means even after installation of apparatus and accurately detecting pressure abnormality. <P>SOLUTION: The fine spinning frame as the spinning machine is equipped with a first block 91, a second block 92, a pneumatic cylinder 80, a revolving current generation chamber 25, a pressure sensor 63 and a unit controller 32. The first block 91 has an air-spinning nozzle 19 applying a revolving air current to a fiber bundle. The second block 92 arranged at the downstream side of the first block 91 has a hollow guide shaft body 20 on which the fiber bundle travels. The pneumatic cylinder 80 separates and contacts the two blocks 91 and 92. The pressure sensor 63 detects pressure of the revolving current generation chamber 25 formed between the two blocks 91 and 92 for twisting the fiber bundle. The unit controller 32 carries out calibration of the pressure sensor 63 when the revolving current generation chamber 25 is opened by the pneumatic cylinder 80. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a configuration of a spinning machine, and more particularly to a configuration for detecting a pressure abnormality in a spinning unit that performs air spinning.

Patent Document 1 discloses a pressure sensor (pressure detection) in a spinning device (spinning machine) that twists fibers by a swirling air flow generated by an air spinning nozzle, and the pressure of an air discharge space communicating with a hollow chamber for spinning. A configuration for detecting by means) is disclosed. Patent Document 1 assumes that this configuration can easily detect a state in which a spun yarn is likely to be defective.
JP 2006-132035 A

  The pressure sensor used in the spinning device of Patent Document 1 has individual differences for each product, and calibration of detected values is necessary for accurate detection. However, if the pressure sensor is calibrated manually only at the time of installation of the spinning device, even if an abnormal pressure sensor or a secular change in pressure detection characteristics occurs after installation, it cannot be detected. In some cases, it is impossible to accurately detect a state in which (abnormal) is likely to occur. In addition, the pressure around the hollow chamber for twisting the fiber is likely to fluctuate due to the effect of the swirling air flow, and even if the sensor is normal, accurate weak yarn detection may not be possible.

  The present invention has been made in view of the above circumstances, and its main object is to provide a spinning machine capable of appropriately calibrating the pressure detecting means even after the installation of the apparatus and capable of accurately detecting an abnormality. There is to do.

Means and effects for solving the problems

  According to an aspect of the present invention, a spinning machine having the following configuration is provided. That is, the spinning machine includes a first block, a second block, an opening / closing drive unit, a hollow chamber, a pressure detection unit, and a control unit. The first block has an air spinning nozzle that causes a swirling air flow to act on the fiber bundle. The second block is provided downstream of the first block in the traveling direction of the fiber bundle. Further, the second block has a hollow guide shaft body configured so that the fiber bundle travels. The opening / closing drive unit separates and contacts the first block and the second block. The hollow chamber is formed between the first block and the second block in order to twist the fiber bundle by the swirling air flow generated by the pneumatic spinning nozzle. The pressure detector detects the pressure of the hollow chamber. The control unit calibrates the pressure detection unit when the first block and the second block are separated by the opening / closing drive unit and the hollow chamber is opened.

  Thereby, the calibration of the pressure detection unit can be performed at any time after the installation of the apparatus, and the reliability of the apparatus is improved. Further, since the calibration is performed when the hollow chamber is opened (using atmospheric pressure), the pressure detection unit can be accurately calibrated without being influenced by other parts of the apparatus.

  In the spinning machine, when the hollow chamber is opened, the calibration detects the pressure a predetermined number of times, obtains an average value of the detection values for the predetermined number of times, and based on this average value This is preferably performed by obtaining an offset value.

  Thereby, since accurate calibration can be performed based on the average value, the accuracy of the detection value of the pressure detection unit is further improved. In addition, since the calibration result can be reflected by adding or subtracting the stored offset value to or from the detection value of the pressure detection unit, the load for calculating the pressure detection value can be reduced.

  In the spinning machine, it is preferable that the control unit determines whether or not the pressure detection unit is abnormal by monitoring a detection value of the pressure detection unit.

  As a result, when the detected value of the pressure detection unit deviates from the normal value, it can be automatically detected as an abnormality of the pressure detection unit. Therefore, repair and replacement of the pressure detection unit can be performed at an appropriate timing.

  In the spinning machine, it is preferable that the control unit obtains an average value of detection values of the pressure detection unit during spinning and uses the average value for control.

  Thus, by using the average value of the detection values of the pressure detection unit for control, it is possible to remove the influence of noise and perform appropriate control of the spinning machine.

  In the spinning machine, it is preferable that the control unit monitors an average value of detection values of the pressure detection unit at the time of spinning, and determines that the abnormality is abnormal when the average value exceeds a predetermined threshold value. .

  Thereby, the pressure abnormality at the time of spinning of the spinning machine can be reliably detected without being influenced by noise by monitoring the average value of the detection values of the pressure detection unit. Therefore, the reliability of the apparatus is further improved.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

  A spinning machine 1 as a spinning machine shown in FIG. 1 includes a large number of spinning units 2 arranged side by side. The spinning machine 1 includes a yarn splicing cart 3, a blower box 4, and a prime mover box 5. The yarn splicing cart 3 is configured to be able to travel in the direction in which the spinning units 2 are arranged.

  As shown in FIG. 1, each spinning unit 2 includes a draft device 7, a spinning unit 9, a yarn feeding device 11, and a winding device 12 as main components. The draft device 7 is provided in the upper part of the casing 6 of the spinning machine 1 and is configured such that the fiber bundle 8 sent from the draft device 7 is spun by the spinning unit 9. The spun yarn 10 discharged from the spinning unit 9 is fed by the yarn feeding device 11 and then wound by the winding device 12 to form a package 45.

  The draft device 7 is for drawing the sliver 13 into the fiber bundle 8. As shown in FIG. 2, the draft device 7 includes four rollers: a back roller 14, a third roller 15, a middle roller 17 on which an apron belt 16 is mounted, and a front roller 18.

  A draft motor 31 composed of an electric motor is installed at an appropriate position of the housing 6, and the back roller 14 and the third roller 15 are connected to the draft motor 31 via a belt. The driving and stopping of the draft motor 31 are controlled by unit controllers (control units) 32 provided in the respective spinning units 2. In the spinning machine 1 of the present embodiment, an electric motor for driving the middle roller 17 and the front roller 18 is also provided in the housing 6, but illustration thereof is omitted here.

  The yarn feeder 11 includes a delivery roller 39 supported by the casing 6 of the spinning machine 1 and a nip roller 40 disposed so as to contact the delivery roller 39. With this configuration, the spun yarn 10 discharged from the spinning unit 9 is sandwiched between the delivery roller 39 and the nip roller 40, and the delivery roller 39 is rotated by an electric motor (not shown), whereby the spun yarn 10 is moved to the winding device 12 side. To send.

  A notification lamp (notification means) 71 is installed in front of the housing 6 so that the operator can be notified of the presence or absence of an abnormality in the spinning unit 9. The notification lamp 71 is connected to the unit controller 32.

  As shown in FIGS. 1 and 2, the yarn joining cart 3 includes a splicer (yarn joining device) 43, a suction pipe 44, and a suction mouth 46. As shown in FIG. 1, the yarn splicing carriage 3 is provided so as to run on a rail 41 provided on the housing 6 of the spinning machine 1 main body. When yarn breakage or yarn cut occurs in a spinning unit 2, the yarn splicing carriage 3 travels to the spinning unit 2 and stops. The suction pipe 44 sucks and captures the yarn end discharged from the spinning unit 9 and guides it to the splicer 43 while rotating in the vertical direction about the axis. The suction mouse 46 sucks and captures the yarn end from the package 45 rotatably supported by the winding device 12 while rotating in the vertical direction around the shaft, and guides it to the splicer 43. The splicer 43 performs splicing between the guided yarn ends.

  As shown in FIGS. 2 and 3, the spinning unit 9 according to the present embodiment includes blocks divided into two, that is, a first block 91 and a second block 92. In the traveling direction of the fiber bundle 8, the second block 92 is provided on the downstream side of the first block 91. As shown in FIG. 3, the air spinning nozzle 19 is provided in the first block 91, and the hollow guide shaft body 20 is provided in the second block 92. The air spinning nozzle 19 is configured to cause a swirling flow to act on the fiber bundle 8 while inserting the fiber bundle 8 sent from the front roller 18. The hollow guide shaft body 20 is disposed so that the tip end portion thereof is inserted into the pneumatic spinning nozzle 19 with the axis line being coincident.

  The pneumatic spinning nozzle 19 includes a needle holder 23 and a nozzle block 34. The first block 91 includes a nozzle portion casing 53, and the nozzle block 34 is supported by the nozzle portion casing 53. A guide hole 21 is formed in the needle holder 23, and the fiber bundle 8 drafted by the upstream draft device 7 is introduced into the guide hole 21. The needle holder 23 holds a needle 22 disposed on the flow path of the fiber bundle 8 discharged from the guide hole 21.

  A tapered hole 54 is formed in the nozzle block 34 at a position downstream of the needle holder 23. And the front-end | tip part 24 of the said hollow guide shaft body 20 is inserted in this taper hole 54, making an axis line correspond. The tip portion 24 is formed in a taper shape, and the taper angle thereof is substantially equal to the taper angle of the taper hole 54. A circular spinning chamber 26 is formed between the tip surface of the hollow guide shaft 20 and the needle holder 23, and the tip of the needle 22 protrudes into the spinning chamber 26. The tip of the needle 22 is disposed so as to face the tip surface of the hollow guide shaft body 20.

  The distal end portion 24 of the hollow guide shaft body 20 is disposed so as to form a predetermined gap with the tapered hole 54. Thus, a swirl flow generation chamber (hollow chamber) 25 is formed, and the swirl flow generation chamber 25 communicates with the spinning chamber 26. An air discharge space 55 is formed in the nozzle casing 53, and the air discharge space 55 communicates with the swirl flow generation chamber 25. A negative pressure source (suction means) (not shown) is connected to the air discharge space 55 through a pipe 60. As this negative pressure source, for example, an unillustrated blower arranged in the blower box 4 can be adopted.

  The nozzle block 34 is formed with a plurality of swirl flow generating nozzles 27 whose outlet ends are opened to the spinning chamber 26. These swirl flow generating nozzles 27 are formed by elongated holes formed in the nozzle block 34. The holes are formed in the tangential direction of the spinning chamber 26, and the longitudinal direction is slightly inclined to the downstream side of the yarn feed. ing. The swirling flow generating nozzle 27 injects compressed air supplied from a compressed air source (not shown) into the spinning chamber 26 to generate, for example, a swirling flow counterclockwise in plan view (see FIG. 5) in the spinning chamber 26. The swirling flow spirally flows downstream along the swirling flow generating chamber 25 and is then discharged from an air discharge space 55 formed in the nozzle casing 53.

  The hollow guide shaft body 20 includes a cylindrical body 56, and the tapered distal end portion 24 is formed at one end of the cylindrical body 56. A yarn passage 29 is formed in the axial center portion of the hollow guide shaft body 20, and after passing the yarn through the yarn passage 29, the spun yarn 10 is discharged through an outlet hole (not shown) on the downstream side. ing.

  The cylindrical body 56 is formed with a large-diameter portion 58 having an enlarged diameter downstream from the distal end portion 24, and the large-diameter portion 58 is exposed to the air discharge space 55. The second block 92 includes a shaft body holding member 59, and is fixed to the shaft body holding member 59 in a state where the large diameter portion 58 is inserted.

  The shaft body holding member 59 is connected to a pneumatic cylinder (opening / closing drive unit) 80. By driving the pneumatic cylinder 80, the second block 92 is moved from the first block 91 as shown by an arrow in FIG. It can be moved away from you. This is because when the spinning chamber 26 and the swirling flow generating chamber 25 are clogged with fibers or accumulated in the air discharge space 55 and cannot be removed by suction by the negative pressure source, the shaft body holding member 59 is used. Is easily separated from the nozzle casing 53 (that is, the second block 92 is separated from the first block 91), and the air discharge space 55, the swirl flow generating chamber 25, and the spinning chamber 26 are opened. This is so that it can be removed. The pneumatic cylinder 80 is controlled by the unit controller 32 and can be operated by an appropriate drive signal.

  A penetrating pressure detection hole 61 is formed in the nozzle casing 53. The pressure detection hole 61 is connected to a pressure sensor (pressure detection unit) 63 via a tube 62. The pressure sensor 63 is configured to transmit a pressure detection value to the unit controller 32.

  Further, the spinning machine 1 of the present embodiment includes an appropriate compressed air source 64, and the compressed air source 64 is connected to a cleaning line 66 through a compressed air tube 65. The cleaning line 66 is a line for cleaning the pneumatic spinning nozzle 19 by, for example, jetting compressed air around the guide hole 21. An electromagnetic valve 67 is installed in the compressed air tube 65, and its opening / closing control is performed by an operation signal from the unit controller 32. The cleaning line 66 and the tube 62 are connected through a joint 68 and a relay pipe 69. An orifice 70 is installed in the middle of the relay pipe 69.

  Next, calibration of the pressure sensor 63 of this embodiment will be described. First, the operator instructs the unit controller 32 to perform calibration.

  Then, the unit controller 32 operates the pneumatic cylinder 80 and retracts the second block 92 from the first block 91, so that the air discharge space 55, the swirl flow generating chamber 25, and the spinning chamber 26 are shown in FIG. Is released. Thereby, the pressure detection hole 61 is opened to atmospheric pressure.

  Next, the unit controller 32 detects the pressure value at atmospheric pressure by the pressure sensor 63 and stores it as an offset value. This value may be a detected value, but in this embodiment, in order to use a more reliable value, when the opening operation of the swirl flow generation chamber 25 is performed, the pressure sensor 63 Detection is performed a predetermined number of times, an average value of the detected pressure values is calculated, and the obtained average value is stored as an offset value. Note that by increasing the number of detections, a more accurate offset value can be obtained, and the accuracy of calibration can be improved.

  When the obtained offset value is far from the normally detected atmospheric pressure detection value, the unit controller 32 determines that the pressure sensor 63 is abnormal (failure), and a notification lamp (notification means) 71. To the operator. Thus, by using the pressure detection value at the time of opening for calibration, the abnormality of the pressure sensor 63 can be reliably detected without being affected by the state of other parts (for example, the failure of the negative pressure source).

  Further, the pressure sensor 63 has a minimum detectable value and a maximum detectable value. However, the detected value of the pressure sensor 63 does not become the minimum detectable value or the maximum detectable value when the swirl flow generating chamber 25 is opened or closed. The detection value of the pressure sensor 63 becomes the minimum detectable value or the maximum detectable value when the pressure sensor 63 itself is out of order. Therefore, the unit controller 32 can determine whether or not the pressure sensor 63 is abnormal by monitoring whether the detected value of the pressure sensor 63 is the minimum detectable value or the maximum detectable value.

  The calibration work and operation check work of the pressure sensor 63 are thus completed, and then the unit controller 32 operates the pneumatic cylinder 80. As a result, the shaft body holding member 59 advances to the nozzle casing 53 side, and the spinning chamber 26, the swirl flow generating chamber 25, and the air discharge space 55 are closed again as shown in FIG. Note that the calibration work and the operation check work of the pressure sensor 63 are not limited to the case of being performed by an operator's instruction. For example, the work is automatically performed every predetermined time or the doffing work of the package 45 is performed. It can also be performed at the time of yarn cutting because the yarn clearer (not shown) has detected a yarn defect.

  Next, the operation during spinning of the spinning machine 1 of the present embodiment will be described. First, at the start of spinning, the unit controller 32 opens the electromagnetic valve 67 for a predetermined time and supplies compressed air to the cleaning line 66 to clean the periphery of the guide hole 21 of the air spinning nozzle 19.

  At this time, the compressed air from the compressed air source 64 is supplied to the pressure detection hole 61 through the relay pipe 69 and is ejected from the pressure detection hole 61 to the air discharge space 55. As a result, even if fibers (details will be described later) are clogged in the pressure detection hole 61, it can be blown off from the pressure detection hole 61, and the pressure sensor 63 accurately measures the pressure at the opening of the pressure detection hole 61. It can be done. Note that the supply amount of the compressed air is adjusted by the orifice 70 so that the pressure in the pressure detection hole 61 does not greatly increase and falls outside the allowable measurement range of the pressure sensor 63.

  After that, spinning by the spinning unit 9 is started. During spinning, the fiber bundle 8 or the spun yarn 10 continues from the front roller 18 to the yarn feeding device 11 through the guide hole 21, the spinning chamber 26, and the yarn passage 29. Thus, the yarn feeding device 11 applies a feeding force to the downstream side, whereby tension is applied to the yarn.

  The fiber bundle 8 discharged from the front roller 18 of the draft device 7 enters the spinning chamber 26 through the guide hole 21 as shown in FIG. As a result, one end of the remaining short fibers is separated from the long fibers that are the core fibers of the fiber bundle 8 and opened, and the short fibers are swung in the swirling flow generating chamber 25 and twisted. Although this twist tends to propagate to the front roller 18 side, the propagation is blocked by the needle 22, so that the fiber bundle 8 sent out from the front roller 18 is not twisted by the twist. Thus, the needle 22 forms a twist propagation preventing means. The fibers twisted as described above are successively produced into actual twisted yarns, most of which are wound fibers, pass through the yarn passage 29, and are discharged from an outlet hole (not shown). The spun yarn 10 is wound around the winding device 12 via the yarn feeding device 11 shown in FIG.

  The fibers that have not been twisted into the spun yarn 10 due to, for example, breaking during the opening and twisting of the above short fibers are used for discharging air from the swirling flow generating chamber 25 by the swirling flow generated by the swirling flow generating nozzle 27. It is sent to the space 55 and discharged through the pipe 60 by suction of the negative pressure source.

  On the other hand, the fibers to be discharged via the pipe 60 as described above may form a loop around the large diameter portion 58 and be accumulated in the air discharge space 55 as indicated by reference numeral 90 in FIG. is there. The cause of this is, for example, that the fiber is caught by some member inside the air discharge space 55 and is not discharged even by the suction flow from the negative pressure source, and the other fibers are gradually entangled with each other as spinning is performed. It is conceivable that it grows to a loop-shaped fiber 90 that exceeds the outer peripheral length of the large-diameter portion 58 and circulates outside the large-diameter portion 58. Alternatively, in this embodiment, the shaft body holding member 59 is configured to be separated from the nozzle portion casing 53 for the convenience of maintenance work and calibration of the pressure sensor 63, but the shaft body holding member after the maintenance or calibration is completed. When attaching 59 at a predetermined position as shown in the drawing close to the nozzle casing 53, the fibers are caught in the joint portion, and the fibers are not discharged but entangled with other fibers to grow and become a loop-shaped fiber 90. It is possible to become.

  Thus, when the fibers 90 grow to some extent in the air discharge space 55 and become fluffy, the flow of air from the swirl flow generation chamber 25 to the air discharge space 55 is obstructed. Is disturbed and causes weak yarn. Further, when the short fibers opened at the time of spinning are swung in the swirling flow generating chamber 25, they come into contact with the fibers accumulated around the large diameter portion 58 and the twisting is hindered. It will cause thread.

  In the present embodiment, in view of the above points, the pressure at the opening portion of the pressure detection hole 61 by the pressure sensor 63 (pressure of the air discharge space 55 communicating with the swirl flow generation chamber 25) during the spinning described above. To monitor. The pressure in the swirling flow generating chamber 25 and the air discharge space 55 is normally maintained at a moderate negative pressure by the suction flow from the negative pressure source, but the fibers 90 are accumulated around the hollow guide shaft body 20. When it comes, the suction flow is inhibited by the accumulated fibers 90, so that the pressure gradually increases and approaches atmospheric pressure.

  The unit controller 32 monitors the change in the detected value of the pressure sensor 63. If the detected value exceeds a preset threshold value, it is determined that weak yarn is likely to occur, and the spinning operation is automatically stopped. It is configured as follows. Accordingly, the spinning operation can be automatically stopped by reliably detecting a state in which the fibers 90 are accumulated in the air discharge space 55 and are likely to cause defects in the weak yarn, so that it is possible to prevent deterioration of the package quality due to the weak yarn. In addition, since the spinning operation can be reliably stopped before the weak yarn defects frequently occur, the operating efficiency of the spinning machine 1 can be improved.

  In the present embodiment, the detection of the pressure abnormality is performed based on the pressure detection value after calibration and by monitoring the average value of the pressure detection values. Specifically, after the pressure detection values are continuously acquired at predetermined time intervals, a moving average of the pressure detection values for a predetermined number of times is calculated. Then, zero point correction is performed by adding or subtracting the offset value obtained by the above-described calibration processing to the moving average value. Then, the unit controller 32 uses the value obtained based on the above calculation to determine whether there is a pressure abnormality.

  The moving average is used in this way because the measured value of the pressure sensor 63 is easily affected by noise such as the swirling air flow, so this noise is eliminated by averaging and the abnormal value is detected based on a reliable value. This is for detection. In addition, by adding or subtracting the offset value obtained in the calibration operation described above, a pressure detection value that eliminates the influence of individual differences of the pressure sensor 63 can be obtained with a simple calculation.

  The negative pressure source is configured to suck air from one side of the air discharge space 55 through the pipe 60. The pressure sensor 63 includes a portion of the air discharge space 55 on the side opposite to the side where air is sucked by the negative pressure source and the yarn path (hollow guide shaft body 20) of the spun yarn 10. It is configured to detect pressure.

  As a result, the pressure detection point by the pressure sensor 63 is located in a deep part of the air discharge space 55 when viewed from the suction side, and therefore, when the fibers 90 accumulate in the air discharge space 55, the pressure sensor 63 detects it. It can be reliably detected in the form of an increase in pressure. Therefore, erroneous detection by the pressure sensor 63 can be avoided.

  The unit controller 32 that has detected the pressure abnormality during the spinning operation immediately stops the draft motor 31, stops the supply of the fiber bundle 8 to the spinning unit 9, and further stops the supply of compressed air to the air spinning nozzle 19. Then, the spinning operation is stopped. Then, the notification lamp 71 is turned on to notify the operator that fibers have accumulated in the air discharge space 55.

  As a result, it is possible to quickly notify the operator that the fibers 90 have accumulated in the air discharge space 55, prompting the removal of the fibers 90 in the air discharge space 55, and making the spinning unit 2 ready for spinning. It can be recovered early.

  As described above, the spinning machine 1 (spinning unit 2) of the present embodiment includes the first block 91, the second block 92, the pneumatic cylinder 80, the swirling flow generation chamber 25, the pressure sensor 63, and the unit. And a controller 32. The first block 91 has an air spinning nozzle 19 that causes a swirling air flow to act on the fiber bundle 8. The second block 92 is provided downstream of the first block 91 in the traveling direction of the fiber bundle 8. The second block 92 has a hollow guide shaft body 20 configured so that the fiber bundle 8 travels. The pneumatic cylinder 80 separates and contacts the first block 91 and the second block 92. The swirl flow generation chamber 25 is formed between the first block 91 and the second block 92 in order to twist the fiber bundle 8 by the swirl air flow generated by the air spinning nozzle 19. The pressure sensor 63 detects the pressure in the swirl flow generation chamber 25. The unit controller 32 calibrates the pressure sensor 63 when the pneumatic block 80 separates the first block 91 and the second block 92 and opens the swirl flow generation chamber 25. It is configured as follows.

  This makes it possible to perform calibration of the pressure sensor 63, which has conventionally been difficult to perform after installation of the apparatus, at an appropriate timing during operation, and improves the reliability of the apparatus. Further, since the calibration is performed in a state where the swirl flow generation chamber 25 as a pressure detection target is opened to the atmospheric pressure (the state shown in FIG. 4), the state of other parts (for example, the failure of the negative pressure source and the suction force) The pressure sensor 63 can be accurately calibrated without being affected by fluctuations).

  In the spinning machine 1 of the present embodiment, when the swirl flow generating chamber 25 is opened, the calibration is performed by the pressure sensor 63 detecting the pressure a predetermined number of times, and the average value of the detection values for the predetermined number of times is obtained. The offset value is obtained based on this average value.

  Thereby, since accurate calibration can be performed based on the average value, the accuracy of the detection value of the pressure sensor 63 is further improved. In addition, since the calibration result can be reflected by adding or subtracting the stored offset value to or from the detected value of the pressure sensor 63, the load for calculating the detected pressure value can be reduced.

  In the spinning machine 1 of the present embodiment, the unit controller 32 determines whether or not the pressure sensor 63 is abnormal by monitoring the detection value of the pressure sensor 63.

  Thereby, when the detected value of the pressure sensor 63 deviates from the normal value, it can be automatically detected as an abnormality such as a failure of the pressure sensor 63. For this reason, the pressure sensor 63 can be repaired and replaced at appropriate timing.

  Further, in the spinning machine 1 of the present embodiment, the unit controller 32 obtains the average value (moving average) of the pressure values of the swirl flow generating chamber 25 during spinning.

  Thus, the influence of noise due to the swirling air flow or the like can be eliminated by using the average value, and each part of the spinning machine 1 can be controlled using the reliable pressure value data.

  Further, in the spinning machine 1 of the present embodiment, the unit controller 32 monitors the average value (moving average) of the detection values of the pressure sensor 63 during the spinning, and the average value exceeds a predetermined threshold value. Is judged abnormal.

  Thereby, the pressure abnormality at the time of spinning of the spinning machine 1 can be reliably detected without being influenced by noise by monitoring the average value of the detection values of the pressure sensor 63. Therefore, the reliability of the apparatus can be further improved.

  Although the embodiment of the present invention has been described above, the above embodiment can be further modified as follows.

  The position of the pressure detection hole 61 is arbitrary as long as it opens to the wall surface of the swirl flow generation chamber 25 or the air discharge space 55. For example, the pressure detection hole 61 can be provided in the shaft body holding member 59.

  Instead of storing the offset value in the unit controller 32, the offset value can be changed to a configuration stored in an appropriate data processing unit provided in the pressure sensor 63.

  In the above embodiment, the pressure sensor 63 measures the pressure, and the unit controller 32 is configured to detect an abnormality when the measured pressure exceeds a predetermined threshold (set for the unit controller 32). However, instead of this, the pressure sensor 63 is provided with an appropriate data processing unit (control unit) so that an abnormality is determined on the pressure sensor 63 side and an abnormality detection notification is transmitted to the unit controller 32. can do.

  The data processing unit may be provided in the prime mover box 5.

  In addition, as a condition for determining that fibers have accumulated in the air discharge space 55 (in other words, a condition for determining the pressure increase in the air discharge space 55), the detection value by the pressure sensor 63 exceeds the above threshold even for a moment. This may be used as a determination condition, or a determination condition may be that a time exceeding a threshold value exceeds a predetermined time, and various methods are conceivable.

  The disposition position of the notification lamp 71 and the manner of turning off and turning on are arbitrary, and control may be performed such that the notification lamp 71 is turned on during normal times and turned off when it is determined that fibers have accumulated in the air discharge space 55. In addition to the notification lamp 71, various modes such as a buzzer are conceivable as the notification means. In short, any device that can notify the operator of five senses such as visual sense and auditory sense can be used.

  The pressure sensor 63 and the pressure detection hole 61 are not limited to the spinning unit 9 using the hollow guide shaft body 20, and can be applied to spinning units having other configurations.

  The configuration for separating and contacting the first block 91 and the second block 92 can be changed to be performed by, for example, a combination of a cam and an electric motor or a solenoid instead of the pneumatic cylinder 80.

  Any suitable formula can be used as the calculation formula for the average value of the pressure measurement values. For example, it can be calculated using a simple moving average, a weighted moving average, an exponential weighted moving average, or the like.

  The pneumatic cylinder 80 is provided so as to separate and contact the second block 92 with respect to the first block 91. However, the pneumatic cylinder 80 is provided on the first block 91 side, and the first block 91 is provided as the second block 92. You may comprise so that it may space apart and contact.

  Further, noise may be removed by attaching a mechanical damper or the like to the tube 62 between the joint 68 and the pressure sensor 63 or between the pressure detection hole 61 and the joint 68.

The front view of the spinning machine which concerns on one Embodiment of this invention. Similarly vertical side view. The longitudinal front view of a spinning part. Longitudinal front view when the spinning section is open The figure which shows the mode of the spinning part at the time of spinning.

Explanation of symbols

1 Spinning machine (spinning machine)
9 Spinning section 19 Pneumatic spinning nozzle 25 Swirl flow generating chamber (hollow chamber)
32 Unit controller (control unit)
55 Air exhaust space 61 Pressure detection hole 63 Pressure sensor (pressure detection part)
71 Notification lamp (notification unit)
80 Pneumatic cylinder (open / close drive)
90 Accumulated fibers 91 1st block 92 2nd block

Claims (5)

A first block having an air spinning nozzle that causes a swirling air flow to act on the fiber bundle;
A second block having a hollow guide shaft provided on the downstream side with respect to the first block in the traveling direction of the fiber bundle and configured to travel the fiber bundle;
An opening / closing drive unit for separating and contacting the first block and the second block;
A hollow chamber formed between the first block and the second block for twisting the fiber bundle by a swirling air flow generated by the air spinning nozzle;
A pressure detector for detecting the pressure of the hollow chamber;
A control unit;
In a spinning machine equipped with
The spinning machine according to claim 1, wherein the control unit calibrates the pressure detection unit when the first block and the second block are separated by the opening / closing drive unit and the hollow chamber is opened. The spinning machine according to claim 1,
The calibration is performed by detecting the pressure a predetermined number of times when the hollow chamber is opened, obtaining an average value of the detected values for the predetermined number of times, and obtaining an offset value based on the average value. A spinning machine characterized by that. The spinning machine according to claim 1 or 2,
The spinning machine according to claim 1, wherein the control unit determines whether or not the pressure detection unit is abnormal by monitoring a detection value of the pressure detection unit. The spinning machine according to any one of claims 1 to 3,
The control unit obtains an average value of detection values of the pressure detection unit during spinning, and uses the average value for control. The spinning machine according to claim 4, wherein
The spinning machine according to claim 1, wherein the control unit monitors an average value of the detection values of the pressure detection unit at the time of spinning, and determines that the abnormality is found when the average value exceeds a predetermined threshold value.

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