JP5102974B2 - Seam treatment method in water jet loom - Google Patents

Description

  The present invention relates to a seam processing method in a water jet loom, and more particularly to a seam processing method in a water jet loom in which a weft exclusion operation for sucking a weft including a seam is performed.

As a seam processing method in a conventional loom, for example, a seam processing method in a jet loom disclosed in Patent Document 1 is known.
In this seam processing method, the end of the weft of the weft cheese in use is connected to the start of the weft of the next weft cheese, and the weft is pulled out from the storage portion of the weft storage device by the injection action of the weft insertion nozzle. However, the seam detecting means detects whether or not the seams of both wefts move toward the weft storage device.

When the movement of the seam is detected, the operation of the loom is stopped and the yarn winding device of the weft storage device is operated so as to store the seam in the storage portion of the weft storage device.
At this time, the weft gripper provided between the weft insertion nozzle and the weft storage device grips the weft, and also controls the delivery of the weft by the action of the locking pin provided in the weft storage device.
At this time, the tip of the weft passing through the weft insertion nozzle is in a state of extending from the injection port of the weft insertion nozzle.

Thereafter, in the suction cylinder provided close to the injection port, a suction flow is generated by switching the passage of the switching valve, and the tip of the weft thread extended from the injection port of the weft insertion nozzle is sucked into the suction cylinder.
Next, the weft stored in the weft storage device is sent out by releasing the weft gripping by the weft gripper and the weft locking by the locking pin.
Thereby, the weft including the seam stored in the weft storage device is sucked into the suction cylinder, the weft is cut upstream of the seam, and the weft including the seam is removed.
JP 2005-120517 A

However, in the prior art, when the passage is switched by the switching valve, it takes time to switch the passage, so that the negative pressure in the suction cylinder corresponding to the weft suction body reaches a predetermined value that can reliably suck the weft. It takes time until.
If it takes time for the negative pressure to reach a predetermined value, there is a high possibility that the weft cannot be sucked even if the weft is sent out.
For example, if weft suction is started in a state where the negative pressure has not reached a predetermined value, the weft seam may be decelerated or stopped by the weft gripper.
Once the weft seam stops at the weft gripper, even if the negative pressure reaches a predetermined value, the weft may not resume movement due to the static frictional force.
That is, there is a problem in that weft suction fails if weft suction is started in a state where a suction force that does not stop the weft movement due to friction between the seam and the weft gripper is not secured.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a weft that includes a seam in the weft removal operation even when it takes time to switch the passage when the passage is switched in the switching valve. Is a seam treatment method in a water-jet loom capable of reliably sucking water.

In order to achieve the above object, the present invention continuously supplies the wefts of a plurality of yarn supplying bodies, detects the seam of the weft, stops the loom before weaving the weft including the seam, and negative pressure By switching the switching valve connected to the source, a negative pressure is generated in the weft suction body provided between the weft insertion nozzle and the woven fabric, and after the generation of the negative pressure, the weft including the seam is sent out, and the weft A seam treatment method in a water jet loom that eliminates the weft including a seam by a suction force based on a negative pressure of a suction body, wherein the spool of the switching valve is not completely moved by switching the passage of the switching valve. until the negative pressure of the weft yarn suction member reaches a predetermined value each comprise a seam by maintaining the engagement of the locking pins to grip and yarn winding surface of the weft reservoir of the by gripper weft the delivery of the weft yarn stopping, the selector valve After the negative pressure of the weft attractant spool to complete the movement has reached a predetermined value, thereby releasing the gripping of the weft by the gripper, by the locking pin can be disengaged from the yarn winding surface The weft yarn including the seam is sent out.

In the present invention, when processing the weft seam in a water jet loom, the negative pressure of the weft suction body generated by switching the passage of the switching valve reaches the predetermined value before the spool of the switching valve completes moving. During this time, the feeding of the weft including the seam is stopped by maintaining the gripping of the weft by the gripping tool and the locking of the locking pin to the thread winding surface of the weft storage part. In this state, the weft drawing is started, and the seam is not stopped by the weft gripper.
Furthermore, after the movement of the spool of the switching valve and the negative pressure in the weft suction body reaches a predetermined value, the gripping of the weft by the gripper is released, and the locking pin is moved from the thread winding surface. Since the weft including the seam is sent out by being separated, a suction force based on the negative pressure reaching a predetermined value acts on the weft, and the weft is reliably sucked by the weft suction body.

According to the present invention, in the seam processing method in the water jet loom, the time required for the negative pressure of the weft suction body to reach a predetermined value after switching the passage of the switching valve is preset in a timer. The weft including the seam may be sent out after the set time of the timer has elapsed.
In this case, it is only necessary to preset in the timer the time required to reach the predetermined value, and the suction force based on the negative pressure that has reached the predetermined value is applied to the weft so that the weft is reliably sucked. Can be sucked into the body.

According to the present invention, in the seam processing method in the water jet loom, the pressure sensor detects that the negative pressure of the weft suction body has reached a predetermined value, and the pressure sensor detects the negative pressure of the predetermined value. Then, the weft yarn including the seam may be sent out.
In this case, since the negative pressure in the weft suction body can be measured by the pressure sensor, if the weft including the seam is sent when the pressure sensor detects the negative pressure of the predetermined value, the predetermined pressure is applied to the weft. By applying a suction force based on the negative pressure that has reached the value, the weft can be reliably sucked into the weft suction body.

  According to this invention, even when the passage switching takes time when the passage is switched by the switching valve, the weft including the seam can be reliably sucked in the weft removal operation.

(First embodiment)
Hereinafter, the seam processing apparatus in the water-jet loom according to the first embodiment will be described with reference to FIGS.
FIG. 1 is a schematic configuration diagram illustrating an overview of a seam treatment device (hereinafter simply referred to as “seam treatment device”) in the water jet loom according to the first embodiment.

An overview of the seam processing apparatus of this embodiment will be described.
As shown in FIG. 1, the seam processing device 10 stores two yarn supply bodies 11 and 12, a seam detection sensor 13 disposed in the vicinity of the yarn supply bodies 11 and 12, and a weft Y <b> 1 having a certain length. A weft storage section 15 that weaves, a weft gripper 21 that grips the weft Y1 drawn from the weft storage section 15, a weft insertion nozzle 24 that wefts Y1 into the warp opening by water injection, and a seam Y3. A yarn removal mechanism 26 for removing the wefts Y1 and Y2 included, a switching valve 34 for switching the passage to the woven fabric W and the passage to the yarn removal mechanism 26, and a blower as a negative pressure source connected to the switching valve 34 32 and control means 14 for controlling each part.

The seam processing device 10 guides the weft Y1 stored in the weft storage unit 15 from the yarn feeders 11 and 12 to the weft insertion nozzle 24 from the weft storage unit 15 through the weft gripper 21, and the warp T of the warp T is injected by water injection. Insert the weft into the opening.
However, when the seam processing device 10 detects the seam Y3 connecting the wefts Y1 and Y2 of the yarn feeders 11 and 12 by the seam detection sensor 13, it performs a seam removal operation by the yarn removal mechanism 26 based on the detection of the seam Y3. The wefts Y1 and Y2 including the seam Y3 are removed by the yarn removal mechanism 26 in the seam removal operation.
Hereinafter, each component of the seam processing apparatus 10 will be described in detail.

[About yarn feeder, seam detection sensor and control means]
The yarn feeders 11 and 12 are placed on a stand (not shown).
The end of the weft Y1 in the yarn supplying body 11 and the starting end of the weft Y2 in the yarn supplying body 12 are joined by a seam Y3.
For this reason, when the weft Y1 of the yarn supply body 11 is exhausted, the weft Y2 of the yarn supply body 12 is continuously drawn out to the weft storage section 15.
A seam detection sensor 13 is installed in the vicinity of the yarn feeders 11 and 12.
The seam detection sensor 13 detects the passage of the seam Y3 that connects the end of the weft Y1 and the start of the weft Y2.
The signal detected by the seam detection sensor 13 of the seam Y3 is transmitted to the control means 14 and becomes the basis of control for eliminating the wefts Y1 and Y2 including the seam Y3.
The control means 14 has a signal input to the joint detection sensor 13 and the like, a function for controlling each part of the loom, a timer function for controlling each part after the set time has elapsed, and the like.

[About the weft storage part]
The weft storage unit 15 stores the wefts Y1 and Y2 drawn from the yarn feeders 11 and 12 by a predetermined length.
The weft storage unit 15 includes a thread winding surface 16 for storing the wefts Y1 and Y2, a thread winding tube 17 that rotates with respect to the thread winding surface 16, and a locking pin 18 that is detachable with respect to the thread winding surface 16. .
For example, the weft Y1 is stored on the thread winding surface 16 of the weft storage section 15 by rotating the yarn winding tube 17 through which the weft Y1 is passed.
The locking pin 18 is a pin controlled by an electromagnetic solenoid 19, which is detached from the thread winding surface 16 when the electromagnetic solenoid 19 is in an excited state, and engages with the thread winding surface 16 in a demagnetized state.
When the locking pin 18 is engaged with the bobbin winding surface 16, the weft Y1 drawn from the yarn feeder 11 is wound around the bobbin winding surface 16 by a predetermined length.
The electromagnetic solenoid 19 is excited or demagnetized under the control of the control means 14.
The control means 14 controls the electromagnetic solenoid 19 based on the loom rotation angle detection information obtained from the loom rotation angle detection rotary encoder 20.

[About the weft gripper]
A weft gripper 21 is installed between the weft storage 15 and the weft insertion nozzle 24.
The weft gripper 21 has an electromagnetic open / close gripper 22 for gripping the wefts Y1 and Y2.
The gripping tool 22 opens the wefts Y1 and Y2 by excitation of the electromagnetic solenoid 23, and grips the wefts Y1 and Y2 by demagnetization.
The electromagnetic solenoid 23 is excited or demagnetized under the control of the control means 14.
In the state in which the weft gripper 21 opens the weft Y1, the weft Y1 stored on the winding surface 16 is injected into the opening of the warp T by the water jetting action of the weft insertion nozzle 24.
The weft gripper 21 determines the weft insertion timing when the gripper 22 starts the weft insertion when the wefts Y1 and Y2 are released and ends the weft insertion when the wefts Y1 and Y2 are gripped.

[Weft insertion nozzle]
The weft insertion nozzle 24 has an injection port 25 for injecting the wefts Y1 and Y2 into the opening of the warp T by the action of water injection.
The weft insertion nozzle 24 is connected to a water supply pipe having a water supply source and a water supply pump (not shown).
The water injection in the weft insertion nozzle 24 is realized by water pumping by operation of a water supply pump.
A holder 42 that holds the tip of the weft insertion nozzle 24 and the suction cylinder 27 that is a part of the yarn removal mechanism is connected to the injection port 25 side of the weft insertion nozzle.
Accordingly, the yarn removal mechanism 26 is held by the holder 42 at a position facing the injection direction of the wefts Y1 and Y2 from a direction perpendicular to the injection port 25.

[Thread removal mechanism]
The yarn removal mechanism 26 mainly includes a suction cylinder 27, a blower 32 that is a negative pressure source, a pneumatic pipe 33 that connects the suction cylinder 27 and the blower 32, and a switching valve 34 provided in the middle of the pneumatic pipe 33. Is done.
FIG. 2A is a side view showing a main part of a suction cylinder 27 as a weft suction body, and FIG. 2B is a front view of the same.
As shown in FIG. 2B, the suction cylinder 27 connected to the end of the pneumatic pipe 33 has a slightly bent suction passage 28, and the negative pressure of the blower 32 is supplied to the inside of the suction passage 28 through the pneumatic pipe 33. The suction force is generated by receiving.

A heating wire 30 is provided at the obtuse angle apex 29 on the inner wall of the suction passage 28, and the heating wire 30 of this embodiment is held by the suction tube 27 so as to cross the suction passage 28.
The heating wire 30 is heated by receiving a current supplied from the power feeding circuit 31, and cuts the wefts Y1 and Y2 having the joint Y3 sucked into the suction tube 27.
The power feeding circuit 31 is a circuit that energizes the heating wire 30 after the wefts Y1 and Y2 having the seam Y3 are sucked into the suction cylinder 27 under the control of the control means 14.
The suction cylinder 27 that holds the heating wire 30 is formed of an insulating material.
The blower 32 as a negative pressure source is a fluid machine that generates a negative pressure by driving, and the driving of the blower 32 is controlled by the control means 14.

The switching valve 34 provided in the middle of the pneumatic pipe 33 has a function of causing the negative pressure of the blower 32 to act on or shut off the suction cylinder 27.
The switching valve 34 has a blower-side port 35 that communicates with the blower 32, a suction cylinder-side port 36 that communicates with the suction cylinder 27, and a water-absorbing roller 40 that contacts the woven cloth W and sucks moisture from the woven cloth W. It has a roller side port 37 to be connected.
The water absorption roller 40 and the roller side port 37 are connected by another pneumatic pipe 41.
The switching valve 34 has a port switching spool, a spool moving motor 38, and a spring 39 as a biasing tool for returning the spool.

Although not specifically illustrated in FIG. 1, the spool of the switching valve is a spool that is moved in a direction in which the negative pressure of the blower 32 is applied to the suction cylinder 27 by the operation of the motor 38.
When the motor 38 is stopped from this state, the spool is returned to the original position by the urging force of the spring 39 for returning the spool so that the negative pressure of the blower 32 is not applied to the suction cylinder 27.
The motor 38 is a motor that is operated under the control of the control means 14 and has an output performance capable of moving the spool against the urging force of the spring 39.
The spool return spring 39 is a coil spring and always applies a biasing force to the spool.
The direction of the urging force of the spring 39 is the direction in which the spool is directed in the direction in which the blower side port 35 and the roller side port 37 communicate with each other.

Next, a seam processing method in the water jet loom according to this embodiment will be described.
In the weaving state, the spool of the switching valve 34 is in a position where the blower side port 35 and the suction cylinder side port 36 are blocked, and the blower side port 35 and the roller side port 37 are in communication.
For this reason, the negative pressure by the blower 32 acts on the water absorption roller 40, and the water absorption roller 40 sucks moisture of the woven fabric W by a suction force based on the negative pressure obtained through the pneumatic pipe 41.

When the weft Y1 of the yarn feeder 11 is exhausted, the seam Y3 passes through the detection area of the seam detection sensor 13.
When the seam Y3 passes the detection area, the seam detection sensor 13 detects that the seam Y has passed, and the detection signal of the seam Y3 is transmitted to the control means 14.
When the control means 14 receives a signal indicating the passage of the joint Y3, the control means 14 stops the operation of the loom main drive source (not shown) and the blower 32 as shown in the time chart of FIG.
The weaving is stopped by stopping the main drive source, and the water absorption of the woven fabric W by the water absorption roller 40 is stopped by stopping the blower 32.
As shown in FIG. 3, when the joint detection sensor 13 detects the joint Y3, the joint removal operation is started.
The seam removal operation refers to the period from the detection of the seam Y3 to the completion of removal of the wefts Y1 and Y2 including the seam Y3.

By the way, the loom rotation angle when the seam detection sensor 13 outputs a signal for detecting the seam Y3 is indefinite.
In this embodiment, the loom rotation angle when the loom stops is, for example, 180 °. For example, with reference to the loom rotation angle of 300 °, the seam Y3 is detected before 300 ° and a signal is output. The control related to the stop of the loom is separated from the case where the detection signal is output later than °.
In the case where the seam Y3 is detected before 300 ° and a signal is output, the loom is set to stop at the next loom rotation angle of 180 °.
On the other hand, in the case of detecting the joint Y3 after 300 ° and outputting the detection signal, this signal is taken into the control means 14 at the next loom rotation angle 300 °, and further the next loom rotation angle 180 °. Sometimes it is set to stop the loom.
The detection signal may be taken in immediately regardless of the loom rotation angle.

When weaving is stopped by this loom stop control, the detected seam Y3 is set on the yarn winding surface 16 or on the upstream side of the yarn winding surface 16.
After the weaving is stopped, the electromagnetic solenoids 19 and 23 are demagnetized, the gripping tool 22 grips the weft Y1, the locking pin 18 is locked to the thread winding surface 16, and the wefts Y1 and Y2 cannot be sent out. It becomes a state.
Further, the leading end of the weft Y1 passing through the weft insertion nozzle 24 extends from the injection port 25.

After the loom is stopped, the control means 14 operates the switching motor 38 so that the spool in the switching valve 34 communicates with the blower side port 35 and the suction cylinder side port 36.
The control means 14 operates the blower 32 simultaneously with the operation of the motor 38.
Along with the movement of the spool by the operation of the motor 38 and the operation of the blower 32, the suction cylinder 27 receives negative pressure from the blower 32 through the air pipe 33, and the suction force increases.
However, since it takes time to complete the movement of the spool even if the motor 38 is operated, the negative pressure in the suction cylinder 27 does not reach a predetermined value while the passage by the spool is switched.
Incidentally, in this embodiment, the time required to complete the movement of the spool is t seconds shown in FIG. 3, and this time corresponds to the set time of the timer.
More specifically, a maximum time of about 6 seconds is required for the completion of the movement of the spool by the motor 38.

Therefore, in this embodiment, as shown in FIG. 4, the gripping tool 22 is used until the negative pressure of the suction cylinder 27 generated by the switching of the passage of the switching valve 34 reaches a predetermined value after the movement of the spool is completed. The weft Y1 is gripped and the locking pin 18 is locked to the thread winding surface 16.
That is, until the negative pressure of the suction cylinder 27 reaches a predetermined value, the state where the delivery of the wefts Y1 and Y2 including the seam Y3 is stopped is maintained.
This is because even if the motor 38 is operated, the spool is not immediately moved, and the negative pressure in the suction cylinder 27 is insufficient during the passage switching, and the suction force based on the insufficient negative pressure includes the joint Y3. This is because the wefts Y1 and Y2 cannot be sucked into the suction cylinder 27.

At the time when the spool has finished moving and the passage has been switched, the negative pressure of the suction cylinder 27 has reached a predetermined value. At this point, the electromagnetic solenoids 19 and 23 are excited.
With the excitation of the electromagnetic solenoids 19 and 23, the gripping of the weft Y1 by the gripping tool 22 is released, and the locking pin 18 is detached from the thread winding surface 16.
The negative pressure has reached a predetermined value necessary for sucking the wefts Y1 and Y2, the release of the gripping of the weft Y1 by the gripping tool 22, and the disengagement of the locking pin 18 from the thread winding surface 16. Thus, the wefts Y1 and Y2 including the seam Y3 are sent out toward the suction cylinder 27.

The suction cylinder 27 sucks the wefts Y1 and Y2 sent by the suction force based on the negative pressure.
The wefts Y2 of the wefts Y1 and Y2 including the sucked seam Y3 are in contact with the heating wire 30 in the suction cylinder 27 as shown in FIG.
The weft seam Y3 is located downstream of the heating wire 30 as shown in FIG. 5, for example.
In this state, the weft Y2 is cut by energizing the heating wire 30, and the wefts Y1 and Y2 suctioned and removed from the suction tube 27 include the seam Y3.
After the removal of the wefts Y1 and Y2 including the seam Y3 is completed, the main drive source is operated, and after a predetermined return operation, weaving is resumed.

The joint processing method according to this embodiment has the following effects.
(1) When processing the seam Y3 of the wefts Y1 and Y2 in the water jet loom, the weft including the seam Y3 until the negative pressure of the suction cylinder 27 generated by switching the passage of the switching valve 34 reaches a predetermined value. Since the delivery of Y1 and Y2 is stopped, the drawing of the wefts Y1 and Y2 is started in a state where the negative pressure has not reached the predetermined value, and the seam Y3 is not stopped by the gripping tool 22.
Further, since the wefts Y1 and Y2 including the seam Y3 are sent out after the negative pressure of the suction cylinder 27 reaches a predetermined value, a suction force based on the negative pressure of the predetermined value acts on the wefts Y1 and Y2, and the weft Y1 , Y2 is reliably sucked by the suction cylinder 27.
In other words, even when it takes time to switch the passage at the switching valve 34, the suction tube 27 can reliably remove the wefts Y1 and Y2 including the seam Y3, and the negative pressure in the suction tube 27 can be reduced. A suction failure of the wefts Y1 and Y2 including the seam Y3 due to insufficient pressure can be prevented.
(2) Since the time required for the negative pressure of the suction cylinder 27 to reach a predetermined value is preset in the timer, when the time set by the timer has elapsed since the start of the motor 38, the negative pressure of the suction cylinder 27 Can be assumed to have reached a predetermined value.

(Second Embodiment)
Next, a seam treatment apparatus in the water jet loom according to the first embodiment according to the second embodiment will be described with reference to FIG.
FIG. 6 is a schematic configuration diagram illustrating the joint processing device of the second embodiment.
In the second embodiment, the configuration other than the suction cylinder is the same as that of the first embodiment. Therefore, the common or similar elements are denoted by the same reference numerals, and the water jet loom in the first embodiment is used. Use the explanation.

As shown in FIG. 6, a pressure sensor 52 is provided in the suction cylinder 51.
The pressure sensor 52 detects that the negative pressure in the suction cylinder 51 has reached a predetermined value, and transmits the detection signal to the control means 14.
That is, in this embodiment, the pressure sensor 52 detects that the negative pressure in the suction cylinder 51 has reached a predetermined value, and when the pressure sensor 52 detects a predetermined negative pressure, the weft Y1 including the seam Y3, Y2 is transmitted.

According to this embodiment, the pressure sensor 52 detects that the negative pressure in the suction cylinder 51 has reached a predetermined value.
After the pressure sensor 52 detects that the negative pressure in the suction cylinder 51 has reached a predetermined value, the wefts Y1 and Y2 including the seam Y3 are sent out. Therefore, the wefts Y1 and Y2 are sucked based on the negative pressure of the predetermined value. The force acts, and the wefts Y1 and Y2 are reliably sucked into the suction cylinder 51.
Furthermore, in this embodiment, the negative pressure in the suction cylinder 51 is predetermined as compared with the first embodiment in which it is assumed that the negative pressure in the suction cylinder 51 has reached a predetermined value after a predetermined time has elapsed. If the value does not reach the value, the control means 14 does not release the wefts Y1 and Y2 because the gripping tool 22 does not release the catching of the weft Y1 and the catching pin 18.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.
In the first and second embodiments described above, the passage of the switching valve and the blower are started after the loom stops. For example, when a signal that detects the weft seam is output, You may make it perform the switching of the channel | path in a switching valve. In this case, the blower may continue to operate even if the loom stops.
In the second embodiment, the pressure sensor detects a negative pressure of a predetermined value in the suction cylinder. However, the pressure sensor may be a sensor that measures the pressure in the suction cylinder. In this case, the control that is the signal output destination It may be determined whether the negative pressure has reached a predetermined value by means.

It is a schematic block diagram which shows the joint processing apparatus in the water-jet type loom which concerns on 1st Embodiment. It is an expanded sectional view showing an important section of a suction pipe in a joint processing device concerning a 1st embodiment. It is a time chart explaining the joint processing method concerning a 1st embodiment. It is a schematic block diagram which shows the state in which the weft containing a seam exists in a storage device in seam exclusion operation | movement. It is a schematic block diagram which shows the state by which the joint was attracted | sucked by the suction pipe | tube in joint removal operation | movement. It is a schematic block diagram which shows the joint processing apparatus in the water-jet type loom which concerns on 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Joint processing apparatus 11 and 12 Yarn supply body 13 Joint detection sensor 14 Control means 15 Weft storage part 16 Yarn winding surface 18 Locking pins 19 and 23 Electromagnetic solenoid 21 Weft gripper 22 Grasping tool 24 Weft insertion nozzle 26 Thread removal mechanism 27 Suction cylinder 30 Heating wire 32 Blower 33, 41 Pneumatic piping 34 Switching valve 38 Motor 40 Water absorption roller 39 Spring Y1, Y2 Weft Y3 Seam T Warp W W Woven cloth

Claims (3)

By continuously supplying the wefts of a plurality of yarn supply bodies, by detecting the seam of the weft, the loom is stopped before weaving the weft including the seam, and by switching the switching valve connected to the negative pressure source, A negative pressure is generated in the weft suction body provided between the weft insertion nozzle and the woven fabric, the weft including the seam is sent out after the negative pressure is generated, and the seam is generated by a suction force based on the negative pressure of the weft suction body. A seam treatment method in a water jet loom that excludes the weft yarns comprising:
Until the negative pressure of the weft suction body reaches a predetermined value before the switching valve spool completes its movement by switching the passage of the switching valve, the weft is held by the gripping tool and the weft storage section Stopping the weft including the seam by maintaining the locking of the locking pin to the thread winding surface;
After the spool of the switching valve completes movement and the negative pressure of the weft suction body reaches a predetermined value, the gripping of the weft by the gripping tool is released and the locking pin is moved from the thread winding surface. A seam treatment method in a water-jet loom, wherein the weft yarn including the seam is sent out by being separated. A time required for the negative pressure of the weft suction body to reach a predetermined value after the passage of the switching valve is preset in a timer, and the weft including the seam is sent out after the set time of the timer has elapsed. The seam treatment method for a water jet loom according to claim 1. The pressure sensor detects that the negative pressure of the weft suction body has reached a predetermined value, and when the pressure sensor detects a predetermined negative pressure, the weft including the seam is sent out. The seam processing method in the water jet loom according to 1.

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