JP2007303004A - Air jet loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air jet loom preventing the loosening of a weft yarn, twist reversion and falling off from a nozzle for weft yarn insertion while stopping the loom. <P>SOLUTION: This air jet loom stopping the loom in a state of cutting the weft yarn inserted directly before the stopping of the loom by a feeding yarn cutter is provided with a control device for controlling weft yarn-holding and releasing movements by a length-measuring and storing device, the ejection movement of the weft insertion nozzle and the opening movement of a warp yarn-opening device, the regulating device releases the holding state of the weft yarn on the length-measuring and storing device after controlling the opening device to bring the warp yarn into a waiting state after stopping the loom and also discharging the weft yarn having a prescribed length toward the warp yarn from the weft insertion nozzle by injecting compressed air into the weft insertion nozzle. Further, a method for actuating the loom afterwards by manually engaging part of the discharged weft yarn extending from the tip end of the weft insertion nozzle on a woven fabric, and hitching-over the discharged weft yarn in front of a feeding yarn cutter is also included. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for starting an air jet loom.

  In air jet looms, weft insertion nozzles weakly jet the compressed air when the weaving machine is stopped until the weaving machine is repaired and the weaving machine is restarted after the weaving machine stops due to poor weft insertion. The weft end is held in the nozzle.

  Here, when a yarn that is easily frayed or twisted back, for example, a yarn in which a covered yarn is twisted around a core yarn such as a covering yarn, is used as a weft, the loom is stopped as described above. In order to hold the weft, the compressed air is constantly injected from the weft insertion nozzle, and the tip of the weft is exposed in a state of being blown away by the injection of the compressed air, so depending on the strength of the constant injection force, the covering yarn If the entanglement of the weft is weak, the entanglement will be loosened, the cover ring part at the tip of the weft will be blown into the weaving mouth, or the core thread itself that has fallen off the cover part will fall out of the weft insertion nozzle, and the weft will be repaired frequently. This will cause a decrease in fabric quality and availability. Normally, wefts are frayed from the cut ends or twisted back.

  As a technique for preventing fraying, twisting back, and falling off from the weft insertion nozzle while the loom is stopped, a twist back prevention device as disclosed in Patent Document 1 is disclosed.

  This anti-twisting device grips the weft thread coming out from the tip of the weft insertion nozzle immediately after stopping the loom with the weft gripping member and maintains the gripping state while the loom is stopped.

  Specifically, in this anti-twisting device, the weft gripping member for gripping the weft drawn from the weft insertion nozzle, and the weft guide member for guiding the drawn weft to the weft gripping member are pulled out. A weft cutting member is provided for cutting the weft.

  The weft gripping member is composed of a pair of gripping pieces provided above the weft insertion nozzle, and grips the weft yarn by driving one gripping piece with a solenoid. The weft guide member is composed of an air injection type blowing nozzle directed to the upper side weft gripping member, and controls air injection by an electromagnetic valve. The weft cutting member is provided between the weft insertion nozzle and the weft gripping member, and the weft cutting member is driven by a solenoid. These members are controlled by a loom control device.

  If any cause of stopping such as poor weft insertion or warp breakage occurs during steady operation, the loom control device stops the loom and activates the blowing nozzle which is a weft guide member. Then, the weft for one pick is pulled out while the weft at the tip of the weft insertion nozzle is blown, and the blown-up weft is guided to a pair of gripping pieces which are weft gripping members. When guided, the weft holding member holds the weft while the loom is stopped. When the repair work by the weaver is completed and the operation button is pressed, the weft control device cuts the weft with the weft cutting member, removes the weft, and restarts the loom.

Thus, since the weft is gripped by the weft gripping member while the loom is stopped, the weft frays, twists back, and falls off the weft insertion nozzle even if compressed air is constantly injected from the weft insertion nozzle while the loom is stopped. Can be prevented.
Japanese Patent Laid-Open No. 10-280254

  However, the device disclosed in Patent Document 1 is provided with a number of members such as the weft gripping member, the weft guide device and the weft cutting member as described above in order to prevent the weft yarn from being untwisted or frayed. Since it is necessary, the cost is high, and the control of each member becomes complicated.

  In addition, when gripping of the weft blown up by the blow-up nozzle fails, the dropped weft is entangled with peripheral devices such as a weft cutting member, and it takes time to remove the entangled weft and causes a reduction in operating rate. .

  Accordingly, an object of the present invention is to prevent the weft yarn from fraying, twisting back, and falling off from the weft insertion nozzle while the loom is stopped, with a simple configuration using an apparatus provided in a conventional loom.

  In the air jet loom, the weft inserted just before the loom is stopped is stopped by the weft cutter, and the weft holding and releasing operation of the length measuring storage device, the weft insertion nozzle injection And a control device for controlling the opening operation of the warp opening device. After the loom stops, the control device controls the opening device to put the warp in a standby state, and then holds the weft on the length measuring storage device. And releasing the weft yarn of a predetermined length from the weft insertion nozzle toward the warp yarn by releasing the state and injecting compressed air to the weft insertion nozzle.

  Furthermore, the present invention relates to a weft holding / releasing operation of a length measuring storage device, a weft insertion nozzle in an air jet loom, in which a weft inserted just before the weaving machine is stopped is cut by a yarn feeding cutter. And a control device for controlling the opening operation of the warp opening device. After the loom stops, the control device controls the opening device to place the warp in a standby state, and then the weft on the length measuring storage device. The weft insertion nozzle is released and compressed air is sprayed onto the weft insertion nozzle to release a weft of a predetermined length from the weft insertion nozzle to the warp. Thereafter, the weft insertion nozzle is manually extended from the tip of the weft insertion nozzle. By locking a part of the released weft on the woven fabric, the released weft is passed to the front of the yarn feeding cutter, and the air is kept while maintaining this locked state. Including the start-up method of performing the start-up of the jet loom.

  The term “on the woven fabric” includes the upper portion of the woven fabric that allows the weft yarn to be passed to the front of the yarn feeding cutter.

  According to the air jet loom of the present invention, after the loom stops, the warp yarn is put into a standby state, and then the weft yarn of a predetermined length is discharged from the weft insertion nozzle toward the warp yarn by injecting compressed air to the weft insertion nozzle. Then, a part of the weft gets on the warp or the woven fabric, enters into the opening of the warp, or gets on the sley. Thus, since the weft is released after the warp is in the standby state, the released weft is not woven into the warp, and the tip of the weft is separated from the compressed air injection region from the weft insertion nozzle. Therefore, while the loom is stopped in this state, even if compressed air is constantly jetted from the weft insertion nozzle, the tip of the weft is not exposed in the blown state, the weft frays, twists back, Alternatively, falling off from the weft insertion nozzle can be prevented.

  In addition, it can be realized with the configuration of a conventional loom, the configuration and control can be simplified, and as described above, the released weft is placed on the warp or woven fabric or its periphery, Easy to prepare for startup.

  Further, a portion of the weft is locked on the woven fabric so that the discharged weft extending from the tip of the weft insertion nozzle is manually passed over the front of the yarn feeding cutter, and this locked state is maintained. By starting the loom, the weft can be reliably cut at the time of starting the loom by the members provided conventionally, and the loom can be started normally.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram illustrating the vicinity of a weft insertion device 10 and a pre-weaving 8 of an air jet loom 1 according to the present invention. FIG. 2 is a block diagram showing the relationship between the control device 20 that controls each device provided in the air jet loom 1 and each device connected to the control device 20.

  The air jet loom 1 (hereinafter, loom 1) includes a weft insertion device 10 that wefts 2 into the opening of the warp 3 by compressed air. The weft insertion device 10 includes a stationary drum type length measuring storage device 11, a weft insertion nozzle 12, and a plurality of sub nozzles (not shown) arranged in parallel in the weaving width direction. The weft insertion nozzle 12 is fixed on a sley (not shown).

  An operation button 50 for outputting a start signal of the loom 1 is connected to the control device 20 input side.

  The length measuring storage device 11 winds the weft 2 around the drum 14 while pulling the weft 2 from the yarn feeder 4 by rotating the rotary yarn guide 15 while holding the weft 2 on the drum 14 with the locking pin 13. The locking pin 13 is driven by a solenoid 16. The solenoid 16 is connected to the output side of the control device 20. The weft insertion nozzle 12 is connected to a pressure air source (not shown) via an electromagnetic valve 41. The solenoid valve 41 is connected to the output side of the control device 20. The plurality of reed frames 31 are formed by passing the warp 3 through each reed in the frame and moving the reed frame 31 up and down according to an opening pattern set in advance by the warp opening device 30. The warp opening device 30 is connected to the output side of the control device 20. In this embodiment, the warp opening device 30 is a warp opening device provided for each reed frame 31 with a dedicated motor that drives the reed frame 31 in the vertical direction independently of the main shaft of the loom 1. When driving the reed frame 31, an operation signal for driving the dedicated motor is output from the control device 20 to the warp opening device 30.

  The weft 2 wound around the drum 14 is released from the retaining pin 13 at the weft insertion start time, and is pulled out from the warp beam (not shown) together with the compressed air by the weft insertion nozzle 12 and formed by the vertical movement of the collar frame 31. It is inserted into the opening of the warp 3 that has been made, and is conveyed to the counter feed yarn side by the sub nozzle. After the weft insertion is completed, the weft 2 is beaten by the reed 32 and then cut between the weft insertion nozzle 12 and the woven fabric 6 by the yarn feeding cutter 5. Whether the weft insertion is correct or not is confirmed by a weft feeler 7 provided on the side opposite to the yarn feeding side.

  The yarn feeding cutter 5 is provided in the vicinity of the pre-weaving 8 and on the yarn feeding side of the warp 3 and is driven by a solenoid 42. The solenoid 42 is connected to the output side of the control device 20. The yarn feed cutter 5 cuts the weft yarn 2 extending from the tip of the weft insertion nozzle 12 that has been wefted into the opening and beaten at a timing of a predetermined spindle angle every time the rod 32 is beaten.

  The woven fabric 6 woven in this way is wound around a cross roll (not shown) while the both ends of the woven fabric 6 are held by the temples 9 provided at both ends of the woven fabric 6, respectively.

  Here, with reference to the timing chart of FIG. 3, the operation of the loom 1 from when the loom 1 stops until the weaver performs repair work and restarts the loom 1 will be described. FIG. 3 shows a graph of the rotation speed of the main shaft of the loom 1 so that the rotation direction of the main shaft can be grasped from the position with respect to the axis.

  When the loom 1 is now in steady operation, the weft insertion device 10 wefts 2 into the opening of the warp 3 in synchronism with the rotation of the main shaft of the loom 1. At this time, the loom operation signal in the control device 20 is a high level signal. If a weft insertion failure occurs during weaving, the weft feeler 7 detects this and outputs a weft insertion failure signal to the control device 20, so that the control device 20 receives this to make the loom operation signal low and stop the loom 1. . Also, when the warp breakage occurs, the control device 20 stops the loom 1 in response to a detection signal from a sensor (not shown) that detects this.

  Specifically, when the loom operation signal becomes a low level, the loom 1 goes through inertial operation and stops at a predetermined main shaft rotation angle (for example, main shaft angle 100 °) in the next cycle in which a weft insertion failure or warp breakage is detected. . At this time, if the loom operation signal becomes low level, the locking pin 13 continues to hold the weft 2 for any cause of stoppage, and the weft insertion nozzle 12 does not perform the weft insertion to prevent weft insertion. Then, the weft 2 that has been inserted in the previous cycle is cut by the yarn supply cutter 5 and separated from the weft in the weft insertion nozzle 12. After the rotation of the main shaft of the loom 1 is completely stopped, the control device 20 reverses the main shaft of the loom 1 until the closing timing of the previous cycle (around the main shaft angle of 300 °), and makes the loom 1 stand by. At this time, the control device 20 outputs an operation signal to the warp opening device 30 to move the heel frame 31 up and down to bring the sheet-like warp 3 into a standby state, for example, a substantially closed state.

  Note that the standby state of the warp 3 may be a state in which the reed frame 31 is stopped in synchronization with the reverse rotation stop of the main shaft of the loom 1, or after the loom 1 is stopped in reverse rotation, the control device 20 causes the warp opening device 30 to Alternatively, the leveling operation signal may be output to perform the leveling operation, and the warp frame 31 may be stopped in a state where the warp 3 is in the closed state. In the former case, the warp 3 may not be closed by the opening pattern or the opening control mechanism when the warp 3 is in the standby state, but there is no problem if the heel frame 31 is completely stopped. It is preferable to perform the leveling operation as in the latter case so that the warp 3 is closed and the warp 3 is set to the standby state, because extra tension is not applied to the warp 3 while the loom 1 is stopped.

  Considering that the warp 3 is in a standby state, the controller 20 intermittently contacts the solenoid 16 of the locking pin 13 a predetermined number of times after a predetermined time T1 (for example, 2 seconds) immediately after the reverse rotation until the closing timing is stopped. The weft 2 holding state on the drum 14 is released by outputting an operation signal, and an operation signal is output to the electromagnetic valve 41 of the weft insertion nozzle 12 to inject compressed air from the weft insertion nozzle 12. A weft 2 of a predetermined length (for example, one pick) is discharged from the insertion nozzle 12 to the warp 3 side. The weft yarn 2 released by the compressed air from the weft insertion nozzle 12 is released onto the sheet-like warp 3 or woven fabric 6 and extends from the tip of the weft insertion nozzle 12 as shown in FIG. Further, if the warp 3 is slightly opened, the weft 2 may enter the opening of the warp 2.

  In this way, even if compressed air is constantly jetted from the weft insertion nozzle 12 while the loom is stopped, the tip of the weft 2 is not exposed in the state of being blown away. Alternatively, falling off from the weft insertion nozzle 15 can be prevented.

  The predetermined time T1 may be 0 seconds. Assuming that the warp 3 is in a standby state when the reverse rotation of the main shaft of the loom 1 is stopped, a series of operations are started immediately after the reverse rotation is stopped.

  Depending on the setting of the opening pattern and the opening control mechanism, the height position of the sheet-like warp 3 may be higher than the height position of the weft insertion nozzle 12 in the closed state of the warp 3. In this case, the released weft 2 is not released onto the warp 3 or the woven fabric 6 but is put on the sley. However, even in such a case, the tip of the weft 2 is not exposed in the state of being blown, so that the weft 2 can be prevented from fraying, twisting back, or falling off the weft insertion nozzle 12.

  Eventually, the loom arrives at the loom 1 where the weaving is stopped, and repair work is performed.

  First, when the temple 9 is a top-mounted temple, as shown in FIG. 5, a part of the weft 2 extending from the tip of the weft insertion nozzle 12 is replaced with the head portion of the temple 9 on the yarn supply side and the woven fabric 6. The weft yarn 2 is locked by being sandwiched between them. Since the weft 2 is locked on the woven fabric 6 in the temple 9 on the yarn feeding side, the weft 2 extending from the tip of the weft insertion nozzle 12 is fed by locking the weft 2 as described above. The thread cutter 5 can be locked so as to hang over the front. When the temple 9 is a lower temple, a part of the weft 2 is sandwiched between the temple holder located above the temple and the woven fabric 6.

  After that, when the loom 1 is stopped due to poor weft insertion as described above, the loom presses the reverse button (not shown) to open the main shaft of the loom 1 waiting at the closing timing to the opening of the previous cycle. Reversing until the timing (predetermined main shaft angle at which the heel frame 31 opens to the maximum), the defective weft is extracted, and the defective weft is removed from the warp opening. Thereafter, the operation button 50 for starting the loom is pressed. In addition, when the cause of the stop of the loom 1 is other than the weft insertion failure, for example, when the warp is broken, the weaver performs the warp repair work on the loom 1 waiting at the closing timing as it is, and thereafter similarly. The operation button 50 is pressed.

  It should be noted that the case where the loom 1 is not caused by a weft insertion failure includes a case where the loom 1 is manually stopped by pressing a stop button (not shown). Further, whether or not the weft 2 is released may be set according to the cause of the stop such as poor weft insertion, warp breakage, and manual stop.

  Of course, fraying, twisting back, or falling off from the weft insertion nozzle 12 in the weft 2 can be prevented even while the weft 2 is locked during the repair operation.

  When a start signal is output from the operation button 50 by pressing the operation button 50, the control device 20 further reverses the main shaft of the loom 1 until the closing timing of the previous cycle, and automatically starts the loom 1 from that position. Reboot. In the case of a stop other than a weft insertion failure, this reversal is not performed.

  In detail, when the activation signal is input from the operation button 50 to the control device 20, the rod 32 is blanked without entering the weft. Further, the operation signal is output to the solenoid 42 at the timing of the predetermined spindle angle similar to that in the steady operation, and the yarn feeding cutter 5 is operated. As a result, the weft yarn 2 extending from the tip of the weft insertion nozzle 12 that is locked between the temple 9 on the yarn feeding side and the woven fabric 6 is cut.

  When such a series of operations ends, the control device 20 sets the loom operation signal to a high level and starts the loom 1.

  When the weft 2 that is difficult to fray or untwist is used, it is not necessary to release the weft 2, so that the controller 20 is provided with an operation switching button (not shown) for switching the discharge operation. It is also possible to switch to “No” so that the weft 2 is not discharged after the loom 1 is stopped.

  The warp opening device 30 may be an electronic dobby type warp opening device driven by the main shaft of the loom 1. In this case, in order to put the warp 3 into a standby state, a drive signal for driving the main shaft of the loom 1 is output from the control device 20 to the drive device of the main shaft motor of the loom 1, and leveling operation is performed to the warp opening device 30. Therefore, the warp 3 is put into a standby state.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

  The present invention is also applicable to the air jet loom 1 provided with a known defective weft removing device. In this case, the present invention is applied when the loom stops other than the weft insertion failure. In the case of a stop due to a defective weft insertion, the defective weft removing device operates, and after the defective weft is removed, the loom is automatically restarted. Therefore, it is not necessary to release the weft 2 when the loom is stopped according to the present invention. Further, when a defective weft removing device of a type in which the weft 2 is pulled out from the length measuring storage device 11 to be removed, the locking pin 13 of the length measuring storage device 11 is released when the defective weft removing device is operated. The number of times of release and the number of times of release of the locking pin 13 during the operation of the present invention may be a common number of times of release, or different numbers of times of release may be set.

  Further, in the case of the air jet loom 1 that supports multi-color weft insertion, depending on the predetermined yarn type to be wefted, in detail, when the loom stops when selecting the weft insertion of yarn that is easily frayed or easily untwisted, You may make it perform discharge | release operation | movement of invention.

It is the block diagram which illustrated the weft insertion apparatus 10 of the air jet loom 1 concerning this invention, and pre-weaving 8 vicinity. 2 is a block diagram showing a relationship between a control device 20 that controls each device provided in the air jet loom 1 and each device connected to the control device 20. FIG. 3 is a timing chart showing each signal and the rotational speed of the main shaft of the air jet loom 1 during a period from the loom stop to the loom start. FIG. 3 is a view showing a state in which the weft 2 is discharged onto the sheet-like warp 3 or the woven fabric 6 and extends from the tip of the weft insertion nozzle 12. It is a figure which shows the state which latched the weft 2 by pinching a part of the weft 2 extended from the front-end | tip of the weft insertion nozzle 12 between the head part of the temple 9 by the side of a yarn feeding, and the woven fabric 40. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air jet loom 2 Weft 3 Warp 4 Feed body 5 Feed cutter 6 Weaving cloth 7 Weft feeler 8 Before weaving 9 Temple 10 Weft insertion device 11 Length measuring storage device 12 Weft insertion nozzle 13 Locking pin 14 Drum 15 Rotation yarn guide 16 Solenoid 20 Control device 30 Warp opening device 31 Reed frame 32 Reed 41 Solenoid valve 42 Solenoid 50 Operation button

Claims (2)

In an air jet loom that stops a loom in a state where a weft thread inserted just before the loom stops is cut by a yarn feeding cutter,
A control device for controlling the weft holding and releasing operation of the length measuring storage device, the injection operation of the weft insertion nozzle, and the opening operation of the warp opening device,
After the loom stops, the control device controls the opening device to place the warp in a standby state, and then releases the holding state of the weft on the length measuring storage device and injects compressed air to the weft insertion nozzle. The air jet loom is characterized in that a weft of a predetermined length is discharged from the weft insertion nozzle toward the warp. In an air jet loom that stops a loom in a state where a weft thread inserted just before the loom stops is cut by a yarn feeding cutter,
A control device for controlling the weft holding and releasing operation of the length measuring storage device, the injection operation of the weft insertion nozzle, and the opening operation of the warp opening device,
After the loom stops, the control device controls the opening device to place the warp in a standby state, and then releases the holding state of the weft on the length measuring storage device and injects compressed air to the weft insertion nozzle. By discharging a weft of a predetermined length from the weft insertion nozzle toward the warp,
Thereafter, by manually locking a part of the released weft extending from the tip of the weft insertion nozzle on the woven fabric, the released weft is passed over the front of the yarn feeding cutter, and this locking A method for starting an air jet loom, wherein the air jet loom is started while maintaining a state.

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