JPH10168711A - Exclusion of fed weft pieced-up-section in fluid jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject method designed to surely deliver a piece-up- section-contg. weft to a yarn exclusion mechanism along with suppressing the increase in the energy consumption therefor. SOLUTION: This exclusion method has such scheme that a changeover from a yarn feed element B1 to yarn feed element B2 is detected by use of a draft means 10 provided between a main nozzle 3 and a woven fabric F to give a loom-halting signal; during the subsequent inertial operation of the loom, a weft Y with a length necessary for reaching a yarn exclusion mechanism 10 is unreeled from a length measuring reservoir 2, concurrently, a guide nozzle 5 is set to jetting so as to guide the weft Y to the yarn exclusion mechanism 10 with the weft Y placed in a line with the woven fabric F; subsequently, using another yarn exclusion mechanism 20 provided opposite to the yarn feed side, the weft Y with a length necessary for reaching the yarn exclusion mechanism 20 is picked during the inertial operation of the loom subsequent to giving the loom-halting signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for eliminating a seam of a weft between yarn feeders outside a system when continuously supplying a weft from a plurality of yarn feeders.

[0002]

2. Description of the Related Art When weft yarns are continuously supplied from a plurality of yarn feeders, a weft seam is inevitably present between the yarn feeders. If a weft containing such a seam is inserted and woven, it becomes a serious weaving defect particularly in glass fiber woven fabric and the quality of the woven fabric deteriorates. Therefore, the loom is stopped before the seam is woven, and Exclusion is generally performed. Techniques for automatically eliminating such a seam are roughly classified into a technique in which the joint is formed on the yarn supplying side and a technique in which the joint is formed on the non-yarn supplying side.

As an example of eliminating the weft seam on the yarn supplying side, there is a method proposed in Japanese Patent Application Laid-Open No. Sho 63-21952. In this technique, a yarn removing mechanism is provided between a main nozzle which is a weft insertion nozzle and a woven fabric. The yarn removing mechanism includes, for example, a guide nozzle that blows up the weft by blast and a suction nozzle that suctions the blown up weft. When it is detected that the seam between the yarn feeders has been fed, a loom stop signal is generated, and the loom is stopped before the seam reaches the position immediately before weft insertion. Next, the weft stored in the length measuring storage device is unwound, and the yarn removing mechanism provided between the main nozzle and the woven fabric, that is, the guide nozzle and the suction nozzle are jetted, and the seam is included from the length measuring storage device. Weft is removed outside the drawer system.

As an example of removing the weft seam on the non-feed side, there is a method proposed in Japanese Patent Publication No. 60-14137. In this technique, a yarn removing mechanism is provided on the non-yarn supply side of the woven fabric. This yarn removing mechanism is also constituted by, for example, an intake blower that sucks the weft. As in the above-described prior art, when it is detected that the winding amount of the yarn feeder has become small, a loom stop signal is generated to stop the loom before the seam reaches the position immediately before weft insertion. Next, the weft is inserted into the warp shed, the weft is transferred to the above-described yarn removing mechanism, and then the weft is sucked by the intake blower of the yarn removing mechanism to remove the weft including the seam out of the system.

[0005]

However, in any of the above-mentioned prior arts, the weft is guided to the yarn removing mechanism after the loom stop signal is issued and the loom is completely stopped after the loom is stopped. There is a common problem that the delivery of the weft becomes uncertain in the process of guiding the weft to the mechanism. For example, in the prior art in which weft seam removal is performed on the yarn supplying side, a cutter disposed between the main nozzle and the woven fabric is operated during a beating operation performed by issuing a loom stop signal and rotating the loom inertia. It cuts the weft from the nozzle to the woven fabric. That is, the weft is cut at the tip of the main nozzle. Therefore, when the loom is completely stopped and the weft is transferred from the main nozzle to the yarn removing mechanism, there is a problem that the leading end of the released weft is violently blown by the guide nozzle, so that the guide to the suction nozzle becomes uncertain. Was.

Similarly, in the prior art in which weft seam elimination is performed on the side opposite to the yarn supply side, similarly, after the loom is completely stopped in the warp shedding state, the weft of the length measuring and storing device can be unwound, and the main nozzle is opened. The weft is injected and the weft is delivered to a yarn removing mechanism on the opposite side of the yarn supply. However, there is also a problem that the delivery to the yarn removing mechanism is uncertain, the consumption amount of the ejection fluid (injection amount) is large, and the energy consumption increases. More specifically, the same weft insertion nozzle injection,
That is, even if the main nozzle and the sub-nozzle inserted in the shed (warp opening) are properly relay-injected, the weft can be reliably delivered during weft insertion during operation of the loom. However, even when the weft insertion is performed in the state where the loom is stopped, even when the same weft insertion as during the operation of the loom is performed, the weft does not reach the non-supply side and the delivery of the weft is uncertain. Therefore, in order to ensure the delivery of the weft yarn, the injection amount of the weft insertion nozzle is increased, and conversely, the energy consumption is increased.

SUMMARY OF THE INVENTION In view of the state of the prior art, an object of the present invention is to reliably transfer a weft including a seam to a yarn removing mechanism, and to suppress the energy consumption for that purpose.

[0008]

According to the first aspect of the present invention, weft yarns of a plurality of yarn feeders are continuously supplied, the switching of the yarn feeders is detected, and a weaving machine stop signal is issued to issue a weft stop signal. This is a method in which the loom is stopped before weaving the seam, and the weft including the seam is eliminated by the yarn eliminating mechanism provided between the main nozzle and the woven fabric. It unwinds the weft of the length necessary to reach it and ejects the guide nozzle provided between the main nozzle and the woven fabric to guide the weft to the above-mentioned yarn removing mechanism while keeping the weft connected to the woven fabric. Make a summary.

According to the second aspect of the present invention, the wefts of the plurality of yarn feeders are continuously supplied, the switching of the yarn feeders is detected, the loom stop signal is issued, and the loom is turned on before weaving the weft seam. This is a method of stopping and removing the weft including the seam by a yarn removing mechanism provided on the non-feeding side, and a length required to reach the yarn removing mechanism during the inertia operation of the loom after the generation of the loom stop signal. The main point is to insert the weft.

[0010]

According to the first aspect, during the inertial operation after the loom is stopped, the weft having a length necessary to reach the yarn removing mechanism is unwound, and the guide nozzle provided between the main nozzle and the woven fabric is jetted. Since the weft is guided to the yarn removing mechanism in a state of being continuously connected to the woven fabric, the weft can be prevented from ramping up in the process of guiding the weft, and the weft can be reliably guided to the yarn removing mechanism. Further, according to the second invention, during the inertia operation of the loom after the generation of the loom stop signal, the weft is inserted in a length necessary to reach the yarn removing mechanism, so that the effect of the shedding motion is effectively applied to the weft insertion. By acting on the weft, the weft can be reliably delivered and the amount of fluid injection required for the delivery of the weft, that is, the energy consumption can be suppressed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of an apparatus used to perform the method of the present invention on an air jet loom. The yarn feeders B1 and B2 are placed on a yarn feed stand (not shown), and the weft Y is sequentially drawn from the yarn feeder B1. The tail thread of the yarn supplying body B1 and the head yarn of the yarn supplying body B2 are tied or adhered to each other and are gripped by the tensor T. A sensor 1 is provided facing the weft wound on the yarn supplying body B1, and detects the exhaustion of the weft on the yarn supplying body B1 and outputs a yarn signal. The sensor 1 is provided for the yarn feeder, and is also provided for the yarn feeder B2 (not shown).

Note that the sensor 1 may be one that detects the exhaustion of the weft yarn on the yarn supplying body or one that detects that the seam has been pulled out. FIG. 1 shows the former case, which is composed of, for example, a yarn feeder B1 in which a weft is wound around a bobbin of a different color from the weft and a sensor 1 which is a reflective photoelectric sensor. This detects the exhaustion of the weft on the yarn supplying body based on the change in the amount of reflected light.
In the latter case, for example, a sensor that is a transmission-type photoelectric sensor disposed in the vicinity of the tensor T and detects that a weft having a seam between the yarn feeders is pulled out and passes through the sensor 1 can be considered. .

The detection of the change in the amount of light may be delayed for a predetermined time from when the loom stop signal is generated, or may be generated promptly. In the former case, waste of the weft is eliminated, and in the latter case, the quality of the woven fabric can be prevented from deteriorating due to poor quality of the weft at the start of bobbin winding.

The weft yarn Y is guided from the yarn supplying body B1 to the length measuring and storing device 2 via the yarn guide 4, and is wound around the drum by the rotation of the flyer G through which the weft is inserted. Further, the weft Y wound on the drum is unwound from the length measuring / storing device 2 and reaches the main nozzle 3 under the forward / backward movement of the locking pin P. A reed 11 having a main nozzle 3, a sub nozzle 9 and an air guide is fixed on a sley (not shown), and the sleigh is driven to swing for beating. On the other hand, the weft Y is further accelerated by the injection of the main nozzle 3 and the injection of the sub-nozzle 9 inserted into the warp opening, and is inserted into the warp opening. A second cutter 7 is provided between the main nozzle 3 and the woven fabric F, and the beaten weft Y
Are sequentially cut. The yarn removing means on the yarn supplying side is constituted by the guide nozzle 5, the first yarn removing mechanism 10, and the first cutter 6 disposed between the main nozzle 3 and the first yarn removing mechanism 10. Further, the first yarn removing mechanism 1
A catcher 8 is movably provided between the cloth 0 and the woven fabric F. Note that the guide nozzle 5 is also fixed on the sley similarly to the main nozzle 3 described above.

On the yarn supplying side, a first yarn removing mechanism 10 for carrying out the first invention is provided facing the yarn supplying path.
A second yarn removing mechanism 20 for implementing the second invention is provided on the non-yarn supply side so as to face the weft flight path. Each of the yarn removing mechanisms has a structure including a member (not shown) incorporated therein, that is, an intake nozzle and a take-up roller. Although both yarn removing mechanisms 10 and 20 are shown in the figure,
In order to carry out any one of the inventions, it is sufficient to provide one of the yarn removing mechanisms.

FIGS. 2 to 8 show a weft seam elimination process according to the first invention. FIG. 2 shows a state in which the weft Y is supplied from the yarn supplying body B1 and the loom is continuously operated. . The weft yarn Y is sequentially pulled out from the yarn supplying body B1 and inserted into the weft.

As shown in FIG. 3, when the weft on the yarn feeder B1 is exhausted and the yarn feeder is switched, the switching of the yarn feeder is detected by the sensor 1 and a loom stop signal is output.
Then, the loom is started to be braked, and the guide nozzle 5 is jetted, and the weft for several turns is unwound from the length measuring and storing device 2. Then, the unwound weft yarn Y is blown up by the airflow of the guide nozzle 5 to avoid cutting the weft yarn by the second cutter 7 and to be sucked and captured by the first yarn removing mechanism 10. More specifically, the ink is sucked by a suction nozzle (not shown) built in the yarn removing mechanism 10 and is sandwiched between a pair of rotating rollers (not shown) located downstream of the suction nozzle. During this time, the leading end of the weft yarn Y is still connected to the woven fabric F, so that the weft yarn Y does not run wild due to the airflow of the guide nozzle 5.

Thereafter, a weft pull-out for removing the weft Y including the seam is performed. As shown in FIG. 4, first, the locking pin of the length measuring / storing device 2 is retracted, and the pair of rotating rollers holding the weft rotate to draw and remove the weft wound on the drum of the length measuring / storing device 2. . Then, as shown in FIG. 5, the locking pin advances and the flyer G of the length measuring and storing device 2 rotates, so that the weft yarn Y is wound on the drum.
4 and 5 are repeated until the seam of the weft is reliably eliminated by the first yarn eliminating mechanism 10.

As described above, the length measuring / storing device 2 assists in drawing out the weft from the yarn feeder, and draws out the weft with the rotating roller. In the above example, the processes of FIGS. 4 and 5 are sequentially and repeatedly operated. However, if the operation of winding the weft and the operation of winding the weft are performed in parallel, in other words, the winding amount of the length measuring and storing device 2 If the configuration is such that the weft is drawn out to the downstream side while maintaining the above, a series of process execution times can be reduced. In the above example, the weft is wound on the drum by rotating the flyer G of the length measuring and storing device 2 in the process of FIG. 5, but when the traction force by the rotating roller is sufficiently large,
This process may be omitted.

However, the internal configuration of the first yarn removing mechanism 10 is not limited to the above-described embodiment in which the weft is nipped and pulled by a pair of rotating rollers. For example, it may be configured with only a suction nozzle to eliminate suction.

The elimination of the weft seam is continued until there is no remaining weft yarn, the seam of the old yarn supplying body B1 and the surface layer of the weft wound around the new yarn supplying body B2. There are various methods for weft rejection control for this purpose as follows. The first is an approximate control that does not measure the exclusion amount. For this purpose, the seam may be excluded after a predetermined time (elapsed time or the number of operation cycles in FIGS. 4 and 5) has elapsed from the start of the exclusion, or the appearance of the seam may be positively detected and used as a starting point. Is also good. The second is actual measurement control for actually measuring the exclusion amount. This includes counting the number of rotations of the flyer G of the length measuring and storing device 2 when winding it on a drum including a seam, detecting ballooning that occurs when the weft from the length measuring and storing device 2 is unwound, and reducing the amount of rejection. It measures or measures the actual rejection amount of the thread rejection mechanism 10 (specifically, counts the number of rotations of the rotating roller).

Next, as shown in FIG.
While the first cutter 6 arranged at the tip of the slab operates to cut the weft, the catcher 8 advances on the yarn path between the yarn elimination mechanism 10 and the woven fabric F to lock the weft Y,
The weft Y is guided to a position where it can be cut by the second cutter 7. At this stage, the second cutter 7 does not operate, and the weft is not cut.

Next, as shown in FIG. 7, when the loom is reversed to the start position, the second cutter 7 connected to the main shaft of the loom operates to cut the weft Y locked by the catcher 8. Further, as shown in FIG. 8, a suction nozzle (not shown) of the first yarn removing mechanism 10 is operated to remove the cut weft Y by suction. By the above-described series of operations, the weft including the seam is eliminated from the system by the first yarn eliminating mechanism 10.

Finally, all elements return to their original state,
The operation of the loom is restarted, and the weft Y from the yarn feeder B2 is sequentially inserted.

In the example described above, the ejection direction of the guide nozzle 5 and the set position of the first yarn removing mechanism 10 are not limited. The guide of the weft yarn to the first yarn removing mechanism 10 may be configured to be indirectly fed instead of the direct feed as described above. For example, the means for gripping the guided weft and the traction mechanism may be configured separately, and the gripping weft may be captured and towed by the traction mechanism.

In the above example, the weft including the seam is removed only by pulling the first yarn removing mechanism 10.
However, instead of this, the weft insertion nozzle (main nozzle) may be ejected together to assist in drawing out the weft from the length measuring and storing device 2.

Further, the above-described weft rejection method can be changed as follows. That is, the catcher 8 may be omitted from the configuration shown to simplify the structure, and the weft in the warp shed may be eliminated according to the seam removal.
In this case, a loom stop signal is output and the weft is guided to the yarn removing mechanism 10 in the same manner as described above, but the loom is reversed to expose the weft to the cloth fell. The operation of the yarn removing mechanism 10 pulls the weft in the warp shed and the weft on the length measuring and storing device 2. When the seam and the weft in the warp shedding are eliminated, the loom is further reversed to the starting position and the operation of the loom is resumed.

FIGS. 9 to 15 show a weft seam elimination process according to the second invention, in which a second yarn elimination mechanism 20 is used. The sensor 1 has the same configuration as that of the first invention.

FIG. 9 shows a state in which the loom is continuously operated in which the weft yarn Y is supplied from the yarn supplying body B1. The weft yarn Y is sequentially pulled out from the yarn supplying body B1 and inserted into the weft.

As shown in FIG. 10, when the weft on the yarn feeder B1 is exhausted and the yarn feeder is switched, the sensor 1
Thus, the switching of the yarn supplying body is detected, and the loom stop signal is output. Then, as shown in FIG. 11, the braking of the loom is started, the loom continues rotating while being decelerated, and the weft of a length necessary for weft transfer is unwound from the length measuring and storing device 2. On the other hand, the main nozzle 3 and the sub-nozzle 9 inserted into the warp shed are jetted, the unwound weft Y is inserted into the weft, and is sucked and captured by the second yarn removing mechanism 20. Specifically, the weft is held between a suction nozzle (not shown) built in the second yarn removing mechanism 20 and a pair of rotating rollers (not shown) disposed downstream of the suction nozzle. Thereafter, the loom stops completely with the warp opened by braking.

Thereafter, in order to remove the weft Y including the seam, the weft is drawn out from the length measuring and storing device 2. As shown in FIG. 12, first, the locking pin P of the length measuring and storing device 2 is retracted and the weft Y is unwound, while the rotating roller (not shown) of the second yarn removing mechanism 20 holding the weft Y rotates. Then, the weft Y wound around the length measuring and storing device 2 is pulled out and removed from the system. Then, as shown in FIG. 13, while the locking pin P advances to lock the weft Y, the flyer G of the length measuring and storing device 2 rotates to wind the weft Y on the drum of the length measuring and storing device 2. . The seam of the weft Y is securely connected to the second yarn removing mechanism 2
The process of FIG. 12 and FIG. 13 is repeated until it is eliminated to zero.

As in the first aspect, the length measuring and storing device 2
Assists withdrawing of the weft from the yarn supplying body, and further withdraws the weft with a rotating roller further downstream. In the above example, the processes in FIGS. 12 and 13 are sequentially and repeatedly operated. However, if the processes are performed in parallel as in the first invention, a series of process execution times can be reduced. When the traction force of the rotating roller is sufficient, the process of FIG. 13 may be omitted as in the first invention.

Next, as shown in FIG. 14, the seam portion is removed by the second yarn removing mechanism 20, the loom rotates to the start position, and the loom operation is restarted. The weft Y inserted into the warp opening at the time of seam removal is woven as it is, and the remaining weft remaining from the woven fabric F and connected to the second yarn removing mechanism 20 is cut and removed by a cutter (not shown). The weft removed by the second thread removing mechanism 20 is discharged to a waste box by the fumarole.

In the exclusion method according to the second invention,
If it is necessary to further start the loom after reversing it to a predetermined starting position in order to avoid the occurrence of a weaving step, etc., the loom is rotated to a predetermined phase after the weft is eliminated by the second yarn eliminating mechanism 20. You can start from. Needless to say, if a problem such as a weft thread exit occurs depending on the starting position, the weft inserted in the previous seam removal may be eliminated without weaving.

The method of guiding the weft yarn to the second yarn removing mechanism 20 is not specified as in the case described above. Instead of feeding the weft yarn directly to the yarn removing mechanism, the weft yarn may be guided indirectly. For example, a means for gripping the guided weft and a pulling means may be separately configured, and the gripping weft may be captured by the pulling means.

In either of the first and second aspects of the invention, the weft is transferred to the yarn removing mechanism during the inertial operation of the loom (ie, the state where the loom rotates while decelerating) after the detection of the seam and the generation of the loom stop signal. Therefore, a special effect is obtained for the following reasons, and the delivery is ensured. In the case of the method of the first invention, the weft at the time of being transferred to the yarn removing mechanism 10 is in a state of being connected to the main nozzle 3 and the woven fabric F, that is, in a loop shape supported at two points. I have. Moreover, the reed 11 and the guide nozzle 5
The position of the weft is changed by the movement of a sleigh (not shown) for fixing the weft. As a result, a condition is obtained in which the first yarn removing mechanism 10 can easily catch the weft yarn. In combination with these conditions, the transfer of the weft to the first yarn removing mechanism 10 is ensured.

In the case of the method of the second invention, the size of the shed changes during the inertia operation of the loom together with the injection of the weft insertion nozzle in the process in which the weft Y is delivered to the second yarn removing mechanism 20. This has a favorable effect on weft insertion and weft transfer. In other words, the pressure of the shed (that is, the inside of the formed warp shedding) is reduced when the warp is closed to the shedding state, so that the turbulence of the jet air flow at the time of weft insertion fluid jetting is reduced. In addition, the air pressure in the shed increases when the state shifts from the warp opening state to the closing state. It is less. In combination with these conditions, the transfer of the weft to the yarn removing mechanism 20 is ensured, the amount of fluid injection for this purpose can be reduced, and an increase in energy consumption can be suppressed.

Although the second invention basically has the above-described structure, it is desirable to set the weft insertion conditions, particularly the weft insertion conditions at the time of inertia operation, appropriately in the implementation. Hereinafter, this point will be described.

In general, the weft insertion conditions during the normal operation of the fluid jet loom are such that the weft reaches the weaving end at an appropriate time in consideration of various conditions such as the warp shedding state and the weft that change with the rotation of the loom. Weft insertion conditions such as the injection timing of the insertion nozzle are properly set.

However, in the second invention, during the inertial operation in which the weft insertion is performed after the detection of the yarn feeder switching, the rotation of the loom gradually decreases, so that the weft flight state is different from that in the normal operation. This causes various inconveniences.

FIG. 18 is a graph showing the relationship between the weft insertion conditions during normal operation and the position of the weft leading end. This is generally called a weft flight curve. The horizontal axis indicates the crank angle, the vertical axis indicates the weft tip position, and the main nozzle, sub nozzle 1, sub nozzle 2,... The horizontal band indicated by the shadow line indicates that the weft insertion nozzle is in the jetting state and the locking pin is in the weft unwinding state. Under the weft insertion conditions during normal operation, the weft flies as shown by the solid line in FIG.

On the other hand, in the weft insertion during the inertia operation, the weft insertion is performed under the weft insertion conditions during the normal operation, even though the rotation of the loom is gradually reduced. The position is in the state of preceding. This is because the weft insertion control is performed according to the crank angle while the loom is being decelerated, so that the injection of the weft insertion nozzle is relatively delayed with respect to the advance of the weft as shown by the broken line in FIG. is there. If the position of the leading end of the weft precedes the advance of the warp shedding, the flying weft is caught by the warp not sufficiently opened, so-called warp catching occurs,
Or, the relay injection of the weft insertion nozzle does not work well, the weft stalls and the yarn sending action does not work enough,
Transfer to the yarn removing mechanism on the non-yarn supply side is not reliably performed.

In order to avoid such inconvenience, an inertia operation weft insertion condition corresponding to the inertia operation is set in advance, and during the inertia operation, the normal operation weft insertion condition is changed in response to the generation of the loom stop signal. What is necessary is just to switch to this inertia driving weft insertion condition and to perform weft insertion. Since the weft flight time can be relatively secured by the loom deceleration, for example, weft insertion after the warp is sufficiently opened, that is, to set the weft insertion condition so as to delay the start of weft insertion, or to delay the weft flight Conditions relating to the weft conveying force, for example, setting such as lowering the fluid pressure to the weft insertion nozzle or performing intermittent ejection may be performed.

The weft insertion conditions to be set include the timing of injection of the weft insertion nozzles (main nozzle and sub-nozzle), the injection pressure, and the operation timing of the locking pin of the weft measuring and storing device.

FIG. 16 shows the weft insertion control mechanism 30 for controlling the weft insertion corresponding to the crank angle in the fluid jet loom which realizes the above embodiment, and its peripheral circuit in more detail. The other parts are the same as those of the previous embodiment, and the same reference numerals are given and the description is omitted.

An encoder 21 is connected to the loom main shaft 12 and outputs a crank angle signal to a weft insertion control mechanism 30. Further, the weft insertion control mechanism 30 is provided with a main control mechanism 23 that controls the overall operation of the loom, such as starting and stopping the loom. The yarn signal from the sensor 1 is input to the main control mechanism 23. The main control mechanism 23 detects the yarn feed change based on the change of the input yarn signal and outputs a loom stop signal to the weft insertion control mechanism 30, while the weft seam elimination operation of the present invention and the start and stop of the loom are performed. Control behavior. The weft insertion control mechanism 30 includes a CPU 31 and a setting device 3
2, a timing controller 33 and a pressure controller 34, and a weft insertion actuator (electromagnetic valve 2)
5 and the pressure transducer 26).

To the CPU 31, the encoder 21, the setting device 32, the timing controller 33 and the pressure controller 34 are connected. The setter 32 includes the weft insertion conditions, that is, the injection timing (injection start crank angle and injection stop crank angle) of the weft insertion nozzle set based on the loom crank angle, the injection pressure, and the locking pin of the length measuring storage device 2. The operation timing (unwinding crank angle and locking crank angle) of P are set, and the set weft insertion condition is output to the CPU 31 (arithmetic processor).
The CPU 31 stores these weft insertion conditions, and outputs an operation command of the weft insertion nozzle to the timing controller 33 and the pressure controller 34 in accordance with the storage conditions and the input crank angle signal.

The pressure controller 34 is connected to the pressure transducer 25 disposed on the upstream side of each solenoid valve.
A command corresponding to the pressure command value from PU 31 is output to pressure converter 25. For example, an electro-pneumatic proportional valve is used for the pressure converter 25, and the compressed fluid from the pressure fluid source 27 is
The pressure corresponding to the command is supplied to the electromagnetic valve 26 located downstream from the pressure. In addition, the timing controller 33 includes:
Multiple solenoid valves 2 for individually controlling the injection of each weft insertion nozzle
6 and the locking pin P are connected, the solenoid valve 29 is opened and closed in response to the injection command from the CPU 31, and the fluid supplied from the pressure transducer 25 is supplied to the main nozzle and each sub nozzle. The locking pin P is driven forward and backward. As described above, it is possible to control the ejection pressure of the weft insertion nozzle and the ejection and the driving of the locking pin.

In the present invention, since the weft insertion is performed in response to the weft insertion during the inertial operation, the setter 32 of the weft insertion control mechanism 30 has the weft insertion corresponding to the normal operation and the inertia operation respectively. Conditions are set in advance.

When the loom rotates, a crank angle signal that changes every moment is input from the encoder 21 to the CPU 31. During the operation of the loom, the CPU 31 outputs a command to the timing controller 33 and the pressure controller 34 in accordance with the pre-stored weft insertion conditions during normal operation to perform weft insertion.

When the yarn feeder is switched, the sensor 1
The main control mechanism 23 outputs a corresponding loom stop signal, and the CPU of the weft insertion control mechanism 30
Input to 31. In parallel with this, the main control mechanism 23 stops the loom and controls a series of operations for eliminating the weft seam except for the weft insertion control. On the other hand, the weft insertion control mechanism 30 changes and controls the weft insertion conditions from those during normal operation to those during inertial operation as described above.

FIG. 17 shows the second method according to the above method.
Is an example of the weft flight curve in the invention of the above, in which the weft insertion start timing during the inertial operation is delayed. For example, when the injection start timing of the main nozzle is
Is changed from 70 degrees to 110 degrees. Accordingly, the unwinding timing of the locking pin and the injection start timing of the sub-nozzle are similarly delayed. This causes the weft end to fly as shown by the broken line in FIG. Thereafter, the weft transferred to the yarn removing mechanism 20 is removed as in the previous embodiment.

The injection start timing of the weft insertion nozzle is set appropriately according to the result of observation of the actual weft insertion state. Various modes are adopted for the delay setting, such as delaying for all weft insertion nozzles, delaying for some weft insertion nozzles, and delaying only for weft insertion nozzles close to the yarn supply side. For injection, at least only the injection start timing should be delayed,
In accordance with this, the end timing can be changed as needed. These set values may be values obtained by experience, or may be obtained from calculations based on data relating to loom rotation.

In the above example, both the weft insertion nozzle and the unwinding timing of the locking pin are delayed, but if only one of them is delayed, the start of weft insertion can be delayed. Further, the injection timing of the weft insertion nozzle and the operation timing of the locking pin,
Although the setting is based on the crank angle, the invention may be applied to a setting based on the elapsed time from the reference crank angle. In addition, as shown in FIG. 16, in the above embodiment, the weft insertion nozzle is ejected continuously for a predetermined period of time, but may be ejected intermittently.

Further, not only the injection timing but also the injection pressure can be changed, that is, the injection pressure during the inertial operation can be set to a value different from that during the normal operation. More specifically, the injection pressure during the inertial operation is set lower than the injection pressure during the normal operation.

This includes a weft insertion control mechanism 30 shown in FIG.
Pressure controller 34 operates substantially. That is, when a loom stop signal is output from the main control mechanism 23, the pressure controller 34 receives the output and outputs a command to the pressure converter 25 to change the injection pressure. However, instead of pressure transducers, prepare fluid sources with different pressure levels,
It may be configured so as to be appropriately switched and supplied by connection to a solenoid valve 29 having a plurality of ports, or a discharge valve configured to discharge a pressurized fluid to the outside on a fluid path,
Excess pressure fluid may be drained at an appropriate time.

The pressure may be set for each weft insertion nozzle, or may be set and switched in multiple stages according to the crank angle, the elapsed time from the start of the inertial operation, and the like.

The embodiment of the second invention is not limited to the above-described setting mode. That is, at least one item such as the injection timing and the injection pressure may be appropriately changed. A combination of a plurality of items may be set.

[0059]

According to the first aspect of the present invention, a weaving machine stop signal is generated after the detection of the yarn feeder switching, and the weft having a length necessary to reach the yarn removing mechanism during the inertial operation is unwound. In addition, the guide nozzle provided between the main nozzle and the woven fabric is jetted, and the weft is guided to the yarn elimination mechanism while being connected to the woven fabric. As a result, the weft can be reliably transferred to the yarn removing mechanism.

According to the second aspect of the present invention, similarly to the above, during the inertia operation of the loom after the generation of the loom stop signal, the weft is inserted in a length necessary to reach the yarn removing mechanism. The effect can be effectively applied to the weft insertion, and the weft can be reliably transferred to the yarn removing mechanism, and the fluid ejection amount required for the transfer of the weft, that is, the energy consumption can be suppressed.

In the second aspect of the present invention, the weft insertion condition is set in accordance with the deceleration of the loom rotation speed as described above.
It is possible to reliably transfer the weft including the seam to the yarn removing mechanism without causing troubles such as warp catching and weft stall, and to reduce the nozzle injection period compared to when the above setting is not made. Since it can be shortened, the fluid consumption is correspondingly reduced and the operating costs are reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an overall configuration of an example of an apparatus used for carrying out the present invention.

FIG. 2 is a plan view showing a weft eliminating process according to the first invention.

FIG. 3 is a plan view showing a weft eliminating process according to the first invention.

FIG. 4 is a plan view showing a weft eliminating process according to the first invention.

FIG. 5 is a plan view showing a weft eliminating process according to the first invention.

FIG. 6 is a plan view showing a weft eliminating process according to the first invention.

FIG. 7 is a plan view showing a weft eliminating process according to the first invention.

FIG. 8 is a plan view showing a weft eliminating process according to the first invention.

FIG. 9 is a plan view showing a weft eliminating process according to the second invention.

FIG. 10 is a plan view showing a weft elimination process according to the second invention.

FIG. 11 is a plan view showing a weft eliminating process according to the second invention.

FIG. 12 is a plan view showing a weft eliminating process according to the second invention.

FIG. 13 is a plan view showing a weft removing process according to the second invention.

FIG. 14 is a plan view showing a weft eliminating process according to the second invention.

FIG. 15 is a plan view showing a weft elimination process according to the second invention.

FIG. 16 is a plan view showing an example of an operation control system that implements the method of the second invention in which weft insertion conditions are appropriately set.

FIG. 17 is a graph showing an example of a weft flight curve in a case where the method of the second invention is carried out by appropriately setting the weft insertion conditions.

FIG. 18 is a graph showing an example of a weft flight curve when the method of the second invention is performed without appropriately setting the weft insertion conditions.

[Explanation of symbols]

 1: Sensor 2: Measured and stored measure 3: Main nozzle 5: Guide nozzle 6: First cutter 7: Second cutter 8: Catcher 9: Sub nozzle 10: First thread removing mechanism 11: Reed 12: Loom main shaft 20: Second thread removing mechanism 21: Encoder 23: Main control mechanism 25: Pressure transducer 26: Solenoid valve 30: Weft insertion control mechanism 31: CPU 32: Setting device 33: Timing controller 34: Pressure controller B: Yarn feeding Body Y: Weft F: Woven cloth P: Locking pin G: Flyer

Claims (4)

[Claims] A weaving machine according to claim 1, wherein the wefts of a plurality of yarn feeders are continuously supplied, the switching of the yarn feeders is detected, and a loom stop signal is issued to stop the loom before weaving the weft seam. This method removes the weft including the seam by the yarn removal mechanism provided between the yarns, unwinds the weft of the length necessary to reach the yarn removal mechanism during the inertia operation of the loom after the loom stop signal is generated, and removes the main yarn. A method for removing a weft feed seam joint of a fluid jet loom, characterized in that a guide nozzle provided between a nozzle and a woven fabric is jetted, and a weft is guided to a yarn elimination mechanism while being connected to the woven fabric. 2. Weft yarns of a plurality of yarn feeders are continuously supplied, a switching of the yarn feeders is detected, and a loom stop signal is issued to stop the loom before weaving the weft seam. It is a method to eliminate the weft including the seam by the provided yarn eliminating mechanism,
A method for eliminating a weft feed weft joint of a fluid jet loom, comprising inserting a weft of a length necessary to reach a yarn eliminating mechanism during a loom inertia operation after the generation of the loom stop signal. 3. When the weft is transferred to the yarn removing mechanism provided on the non-yarn feeding side, weft insertion conditions during the inertia operation of the loom are set in advance, and the normal operation of the loom is performed in response to the generation of the loom stop signal. 3. The method according to claim 2, wherein the weft insertion is performed by switching from a weft insertion condition at the time to a weft insertion condition during the inertia operation of the loom. 4. The weft insertion condition set in accordance with the inertia operation of the loom is at least one of an injection start timing of a weft insertion nozzle and an unwinding timing of a locking pin of a weft length storage device. 4. The method according to claim 3, wherein the weft supply weft joint is eliminated.