JP3148431B2 - Defective yarn removal method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reliably removing a defective yarn by a defective yarn removing device when a defective weft insertion occurs.

[0002]

2. Description of the Related Art As a device for removing defective yarn, Japanese Utility Model Application Laid-Open No. 62-4
There is an apparatus disclosed in Japanese Patent Publication No. 1083 and Japanese Utility Model Publication No. 4-14469.

In the former defective yarn removing device of Japanese Utility Model Application Laid-Open No. 62-41083, when a defective weft insertion is detected, a loom stop signal is output, and a predetermined amount of the weft yarn is released from the weft measuring and storing device. A weft connected to the defective yarn, that is, the trailing end of the defective yarn is fed through a yarn guide (yarn guide 7) provided on the sley to a fluid type guiding means (guide nozzle 2).
And the blow nozzle 12) guides the mechanical yarn to the mechanical pulling means (the winding body 9 and the rotating body 10). After the loom is stopped, the loom is reversed and the defective yarn is discharged, and then the trailing end of the defective yarn is pulled. Defective yarn is pulled while holding. Then, when a yarn absence signal is detected from a sensor provided at the intake of the defective yarn before a predetermined time has elapsed from the start of the towing, it is determined that the removal of the defective yarn, such as cutting, has failed.

[0004]

[Problems of the above technology] According to the above-mentioned defective yarn removing device, the trailing end portion of the defective yarn is held by the pulling means after tapping, so that the determination of success / failure of the defective yarn removal becomes inaccurate. To explain in detail, the defective yarn is discharged while operating the fluid type guiding means, and thereafter, since the mechanical traction means holds the defective yarn, when the weft is a filament or a strongly twisted yarn, during the reverse rotation of the loom, When the restraint by the warp yarn is released, the defective yarn may be pulled out from the warp yarn opening only by the traction force of the fluid type guide means. Then,
When the defective yarn is held by the mechanical traction means and the traction is started, the length of the defective yarn pulled by the traction means is substantially shortened. For this reason, even if all of the defective yarn has been removed from the opening, that is, even if the purpose of removing the defective yarn has been achieved, the removal time is shorter than the predetermined time, and it is determined that the removal has failed. .

Also, in the latter defective yarn processing apparatus disclosed in Japanese Utility Model Publication No. 4-14469, the trailing end of the defective yarn guided by the fluid type guiding means is held by a mechanical pulling means before the weaving machine reversely rotates. In this state, the loom is reversed, the defective yarn is spouted, and after the spouting, the faulty yarn is pulled and removed.

[0006]

[Problem] According to this defective yarn processing apparatus, even if the defective yarn is pulled out of the warp yarn opening by the traction force of the fluid type guide means, the restriction on the weft by the warp is released.
The length of the defective yarn extracted by the traction means does not change. However, during the reverse rotation of the loom, there is a possibility that the defective yarn may be cut from the warp yarn opening to the pulling means by being pulled by the swinging yarn guide.

[0007]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to accurately determine the success or failure of removing a defective yarn and to reliably remove the defective yarn.

[0008]

Based on the above-mentioned purpose [solving means of the present invention, the present invention, a horizontal
After the insertion failure, release the restraint of the defective yarn by the warp yarn.
The next site following the cycle in which
Reverse the loom from the stop position of the crew to feed out the defective yarn
And the yarn provided on the sley by the fluid type guide means
Mechanical pulling of the trailing end of defective yarn guided through the guide
Means, and after the tapping, by mechanical traction means.
In the defective yarn removing device that pulls and removes the defective yarn,
During reverse rotation, the sleigh is almost at the end of the next cycle.
The restraint of the defective yarn by the warp yarn is released from the retracted position.
The mechanical traction means when the
Start holding the trailing end of the defective yarn by
Providing holding means between the warp yarn opening and the mechanical traction means,
During the reversal, the sleigh will
The restraint of the defective thread by the warp from the last retracted position is released.
When the holding means is
Start holding the trailing end of the defective thread,
The pulling means holds the trailing end of the defective yarn and
The holding of the defective yarn by throwing is released.

In the next cycle following the cycle in which the weft insertion failure has occurred, in other words, during the reversal of the inertia operation cycle of the loom, when the sleigh is almost at the rearmost position,
The length of the trailing end of the defective yarn from before weaving to the pulling means or the holding means is substantially maximum. At this time, if the trailing end of the defective yarn is held by the pulling means or the holding means, even if the yarn guide swings with the sled until the subsequent defective yarn is discharged, the defective yarn is pulled and cut by the yarn guide. Never do.

Also, during the reversal in the inertial operation cycle,
When the sleigh is at a position other than the slat position from the almost retreat position to the sleet position at the time when the restraining of the defective yarn by the warp yarn is released, the trailing end of the defective yarn is pulled by a pulling means or Even if the loom is held up by the holding means and the loom is reversed until the defective yarn is discharged, the trailing end of the defective yarn is not cut. To be more specific, the length of the rear end of the defective yarn from before weaving to the traction means or holding means is:
It is shorter than when the sleigh is almost in the retreat position. However, during the reversal after the holding, the distance from before weaving to the traction means or holding means via the yarn guide exceeds the length of the rear end of the defective yarn from before weaving to the traction means or holding means. This is after the restraining of the defective yarn by the warp yarn is released, and the excess yarn is pulled out from the warp yarn opening, so that the rear end of the defective yarn is not pulled by the yarn guide and cut. It should be noted that the time at which the restraining of the defective yarn by the warp yarn is released, in other words, the rotation angle of the main shaft of the loom differs depending on the type of the weft yarn or the manner of movement of the shedding, and is set experimentally every time the conditions are changed.

Further, even when the defective yarn is pulled out by the pulling force of only the fluid guide means when the defective yarn is discharged, the length of the mechanical yarn pulling means does not change. From the above, it is possible to accurately determine the success or failure of the removal of the defective yarn without cutting the defective yarn at the time of tapping.

[0012]

Embodiment 1 This embodiment is shown in FIGS. 1 to 4 and corresponds to claim 1, wherein the weft is unwound from the length measuring and storing device at the same time as the weft insertion failure is detected and blown up, thereby causing a failure. In order to avoid cutting the yarn, and during the reversing of the loom for unwinding, the loom is stopped once at the retreat position of the slay, and the trailing end of the defective yarn is held by the mechanical traction means. This is an example of restarting.

In FIG. 1 and FIG. 2, the defective yarn removing device 1 of the present embodiment is basically similar in configuration to the device disclosed in Japanese Utility Model Laid-Open No. Sho 62-41083 or Japanese Utility Model Publication No. Hei 4-14469. The main nozzle 2 for weft insertion, the cutter 3 for cutting the defective yarn, the blow-up nozzle 4 for guiding the yarn, and the yarn guide 5 are attached to, for example, a sley 6 or a part of a reed 7 integrated with the sley 6. Here, the mechanical pulling means is provided inside the defective yarn removing device 1 and is constituted by a pair of rotatable members 19 and 20 which can be separated from each other, and the fluid type guiding means is provided by the blowing nozzle 4 or the suction nozzle. It is constituted by the injection nozzle 18 or a combination thereof.

The weft yarn 8 is supplied from a weft yarn package (not shown). For example, a length necessary for one weft insertion or a longer weft yarn length is stored by a drum-type length measuring storage device 9, and at the weft insertion timing. The opening 1 of the warp yarn 10 together with the jetting fluid by the main nozzle 2
1, the weft thread 8 is driven into the weaving cloth 13 of the woven fabric 12 by the reed 7 and cut by the weft feeding cutter 14 on the weft insertion side, so that the next weft thread 8 is fed.
Separate from The normal weft insertion state is detected by the weft insertion sensor 15 on the arrival side of the weft 8.

In the weft insertion process, when a weft insertion failure occurs, the weft insertion sensor 15 detects the state and generates a loom stop signal, which is sent to a loom control device (not shown) to stop the loom. In addition, the defective yarn removing device 1 and the like are operated in preparation for the extraction and removal of the defective yarn 81.

FIG. 3 shows the process from the occurrence of a poor weft insertion to the stop of the loom, together with the rotation angle and the opening state of the loom. In the figure, a poor weft insertion cycle corresponds to one rotation of a poor weft insertion, ie, a poor weft insertion, and a subsequent inertial operation cycle shows a rotation period during which the weaving machine stops due to poor weft insertion.

When a poor weft insertion occurs in the poor weft insertion cycle, the state is detected by the weft insertion sensor 15, and a loom stop signal is output at about 290 degrees. After stopping at the primary stop position of 260 degrees in the next inertial operation cycle, the reverse rotation operation is started, the operation is temporarily stopped at near 180 degrees of the inertial operation cycle, that is, at the secondary stop position, and through the weft holding step according to the present invention. Then, the reverse rotation is restarted, and the ejection of the defective yarn 81 is completed at the 180-degree of the weft insertion defective cycle, that is, at the tertiary stop position of the full opening, and stopped there. At this tertiary stop position, the defective yarn removing device 1 performs a defective yarn removing operation. After the removal operation is completed, the loom is turned again and in the cycle immediately before the poor weft insertion cycle,
After stopping at the quaternary stop position and receiving a driving command,
From this position, the motor rotates in the normal rotation direction, and enters a restart state.

Next, FIG. 4 shows the operating state of each part from the time when the loom stop signal is generated to the tertiary stop position and the quaternary stop position through the primary stop position and the secondary stop position of the loom. ing. When the loom stop signal is generated, the loom operation contactor is set to the off state, the locking pin 16 of the length measuring and storing device 9 is retracted twice, for example, by the solenoid 17, and the weft 8 in the stored state is subjected to the process of removing the defective yarn. Release only the required length.

At the same time, the blow-up nozzle 4 as a fluid (air) type guide means starts a blow-up operation, and the suction injection nozzle 18 inside the defective yarn removing device 1 starts a spray operation, thereby providing a mechanical type. A casing 21 is provided between a pair of rotating bodies 19 and 20 constituting the traction means.
An airflow in the drawing direction is generated in the intake port 22 formed at the bottom.

By these operations, the weft yarn 8 is disconnected from the cutting area of the yarn feeding cutter 14 while being connected to the defective yarn 81, and is in a state of avoiding cutting. Defective thread 8
The rear end portion 1 enters the hood 23 by the blowing airflow from the blowing nozzle 4, passes through the intake port 22 by the suction airflow from the injection nozzle 18, and forms a pair of rotating bodies 19, 20 constituting mechanical traction means. It is guided between.

After the loom has stopped at the primary stop position of 260 degrees in the inertial operation cycle, the loom rotates in reverse according to a command from the reverse contactor of the loom, and temporarily stops near the secondary stop position of 180 degrees in the same cycle. During this stop, the mechanical weaving means, that is, the pair of rotating bodies 1 from the weaving cloth 13 through the yarn guide 5
The length of the rear end portion of the defective yarn 81 reaching 9, 20 is the maximum as seen in FIG.

Here, the holding cylinder 24 inside the defective yarn removing device 1 is operated, and one of the rotating bodies 19 is moved forward to make contact with the other rotating body 20. The pair of rotating bodies 19 and 20 abut against each other to sandwich and hold the rear end portion of the defective thread 81 therebetween. Before or after this, the defective yarn cutting cutter 3 cuts the weft yarn 8 from the main nozzle 2 to the defective yarn removing device 1 by repeating a plurality of cutting operations, for example, twice, to thereby remove the defective yarn 8.
1 is set in a state where it can be separated and removed from the weft yarn 8 in the main nozzle 2.

Thereafter, the weaving machine resumes reverse rotation and stops at the tertiary stop position 180 degrees in the poor weft insertion cycle, thereby completing the ejection of the defective yarn 81. At this point, the operation of the blow-up nozzle 4 stops. In addition, at the latest, when the ejection is completed or at the time of reverse rotation before reaching 180 degrees, the restraining of the defective yarn 81 by the warp yarn 10 is released, and before the extraction by the pair of rotating bodies 19 and 20, the defective yarn 81 is pulled by the pulling force of the blowing nozzle 4. Even if 81 is pulled out from the opening 11, it does not pass through the intake port 22, and furthermore, the defective yarn 81 pulled out by the defective yarn removing device 1.
There is no change in length. Also, during the reverse rotation of the loom,
At the same time, even if the yarn guide 5 swings, the defective yarn 81 in the held state is not cut by the pulling force.

Next, at the tertiary stop position, when a predetermined time elapses after the loom stops, the suction injection nozzle 18
Is stopped, and the winding motor 25 is started by a command from the control unit 32, and the rotation of the winding motor 25 is performed via the cylindrical shaft 28 supported by the gears 26 and 27 and the bearing 29. 19 and 20. Accordingly, the pair of rotating bodies 19 and 20 are wound around the defective yarn 81 by mechanically pulling the defective yarn 81.
1 is removed from the opening 11.

Simultaneously with the start of the extracting operation, the monitoring circuit 30 detects the yarn sensor 31 near the inlet 22, for example.
Thus, the presence of the defective thread 81 is detected, and the time required for the pulling operation is integrated. When the time required for winding has elapsed, the yarn sensor 31 confirms that the state has changed to the state of no yarn, and the control unit 32 stops the motor 25 to stop the motor at the tertiary stop position. The operation of removing the defective thread 81 ends.

At this time, the holding cylinder 24 retreats one of the rotating bodies 19 to open the wound defective thread 81 between the pair of rotating bodies 19 and 20. The defective yarn 81 in the wound state is
When released between 0, the blow-up nozzle 4 and the injection nozzle 18 operate simultaneously, and the defective yarn 81 in the wound state passes through the inside of the cylindrical shaft 28 mainly due to the airflow from the injection nozzle 18. It is discharged outside.

At the same time, the loom reverse contactor is turned on, and the loom reverses again, and reverses toward the fourth stop position. At the fourth stop position, the loom stop signal is deleted, and the loom operation contactor is converted to an "H" level signal instead. Thereafter, automatically or by an external command, the loom is restarted and starts the weaving motion again.

In the above embodiment, the rear end of the defective yarn 81 is held by the mechanical pulling means when the sleigh 6 reaches the last retreat position during the reversal of the inertia operation cycle of the loom. During the reversal of the inertia operation cycle of the loom, when the sleigh 6 is at any position between the last retreat position and the sleigh position at which the restraining of the defective yarn 81 by the warp yarn 10 is released, the defective yarn The rear end of 81 may be held by mechanical traction means.

For example, in the poor weft insertion cycle,
When the loom is reversed until the angle reaches 40 degrees, when the restraint of the defective yarn 81 by the warp yarn 10 starts to be released, assuming that the beating motion curve has a sine waveform, 120 degrees during the reversal of the inertial operation cycle. When this occurs, the sley 6 has moved to the same position as the sleigh position at the time when the restraining of the defective yarn 81 by the warp yarn 10 is released. Therefore, as shown in FIG.
When the angle is between 20 degrees and 150 degrees, for example, the loom is temporarily stopped to hold the trailing end of the defective yarn.

When the reverse rotation of the loom is resumed, the distance from the weaving front 13 to the mechanical traction means via the yarn guide 5 gradually decreases while the inertia operation cycle is reversed, and
Is the shortest when it has advanced the most. Thereafter, the distance gradually increases, and when it reaches 210 degrees, the distance is equal to the length of the rear end of the defective yarn 81 from the weave front 13 to the mechanical traction means. The distance exceeds the length of the rear end of the defective thread 81. However, 2
Since the restraint of the defective yarn 81 by the warp yarn 10 has begun to be released from 40 degrees, even if the rear end of the defective yarn 81 is pulled by the yarn guide 5, the defective yarn 81 is unwound from the opening 11 by that much, The rear end of the defective thread 81 will not be cut. It is desirable that the weft thread 8 continuing from the main nozzle 2 to the mechanical pulling means be cut by the defective thread cutting cutter 3 when the rear end of the defective thread 81 is held. Further, the defective yarn removing device applied to the present invention is not limited to the embodiment, but is a defective yarn removing device of a type in which the trailing end of the defective yarn 81 is guided to the mechanical pulling means by the fluid type guiding means. It is good if it exists.

[Embodiment 2] This embodiment corresponds to claim 2.
As shown in FIG. 5, a holding means is provided between the opening 11 of the warp yarn 10 and the mechanical traction means, for example, in the yarn guide 5,
The configuration is such that the defective thread 81 can be held inside the thread guide 5. Here, the holding means includes a holding body 34 and a solenoid 33 as a driving source for the holding body 34.

During the reverse rotation of the loom from the primary stop position,
When the sleigh 6 reaches the last retreat position in the inertial operation cycle, the solenoid 33 operates while the reverse rotation continues,
The rear end portion of the defective thread 81 is held by the holding body 34.
At this time, the defective yarn 81 from the weaving front 13 to the holding body 34
The rear end has the maximum length. At this time, the cutter 3 for cutting the defective yarn does not operate.

When the discharging of the defective yarn 81 is completed, that is, when the loom is stopped at 180 degrees in the weft insertion defective cycle, the injection operation of the blowing nozzle 4 is stopped. next,
The mechanical pulling means holds the rear end of the defective thread 81, and the holding body 34 releases the holding. Thereafter, after the suction injection nozzle 18 stops and the cutter 3 operates, the start of the removing operation and the monitoring of the removing time are performed in the same manner as in the first embodiment.

It should be noted that modifications similar to those of the first embodiment can be made to this embodiment. That is, during the reversal of the inertial operation cycle, the sley 6 is substantially at a position other than the most retreated position from the most retreated position to the sleigh position at the time when the restraining of the defective yarn 81 by the warp yarn 10 is released. At this time, the rear end of the defective thread 81 is held by the holding means, and after the defective thread 81 is taken out, the mechanical traction means holds the defective thread 81 and releases the holding of the defective thread 81 by the holding means. Is also good.

[0034]

[Other Embodiments] During the reverse rotation of the loom, the defective yarn 81 is
Just before starting to be released from the restraint by the weft, depending on the type of the weft yarn, but just before reaching the rotation angle 240 degrees of the loom main shaft in the poor weft insertion cycle, for example, at 250 degrees, the rear end of the defective yarn 81 by the mechanical pulling means or holding means. May be held. According to this method, the swing range of the sley 6 from the holding of the defective yarn 81 to the completion of the feeding is small, and the possibility that the defective yarn 81 in the holding state is pulled by the yarn guide 5 and cut is reduced. Some goals can be achieved.

[0035]

According to the present invention, even if the trailing end of the defective yarn is held by the mechanical pulling means or the holding means, the defective yarn is pulled by the yarn guide during the reverse rotation and the defective yarn is cut. Therefore, in the process of removing the defective yarn, it is possible to prevent the occurrence of the cutting failure of the defective yarn beforehand, and it is assumed that the defective yarn is pulled out only by the traction force of the fluid guide means when the restriction of the defective yarn by the warp yarn is released. However, the length of removal of the defective yarn by the mechanical pulling means does not change. For this reason, there is no cutting of the defective yarn at the time of tapping, and the success / failure of the defective yarn removal can be accurately determined.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a defective yarn removing device.

FIG. 2 is a side view of a thread guide attachment portion.

FIG. 3 is an explanatory diagram of a rotation state of a loom in a poor weft insertion cycle and an inertial operation cycle.

FIG. 4 is a time chart at the time of a defective yarn removing operation.

FIG. 5 is a side view of a constituent part of the holder.

FIG. 6 is a time chart at the time of a defective yarn removing operation.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 defective yarn removing device 4 blow-up nozzle as fluid type guiding means 5 yarn guide 6 slay 8 weft 81 defective thread 9 length measuring storage device 13 weaving 15 weft insertion sensor 18 injection nozzle as fluid type guiding means 19 mechanical pulling means Rotating body 20 as a mechanical pulling means 31 thread sensor 34 holder

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-264036 (JP, A) JP-A-59-223339 (JP, A) JP-A 61-24481 (JP, U) JP-A 62 41083 (JP, U) JIJU 4-14469 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) D03D 51/00

Claims (2)

(57) [Claims] (1)After weft insertion failure, warp
In order to release the constraint on the good yarn,
Reverse the loom from the stop position of the next cycle following the
In addition to picking out defective threads, the fluid type guide means
The defective yarn guided through the yarn guide
Hold the rear end by mechanical traction means, and after
Defective yarn removal by pulling and removing defective yarn by mechanical traction means
In the device, During the reversal, the sleigh will
The restraint of the defective thread by the warp from the last retracted position is released.
The mechanical traction
Starting holding of the trailing end of defective yarn by means
Defective yarn removal method. (2)After weft insertion failure, warp
In order to release the constraint on the good yarn,
Reverse the loom from the stop position of the next cycle following the
In addition to picking out defective threads, the fluid type guide means
The defective yarn guided through the yarn guide
The rear end is held by mechanical towing, and after the above
Defective yarn removal by pulling and removing defective yarn by mechanical traction means
In the device, A holding means is provided between the warp yarn opening and the mechanical pulling means.
During the reversal, the sleigh is
Release of the defective yarn from the warp yarn
The holding hand
The step starts holding the trailing end of the defective thread,
Mechanical pulling means holds the trailing end of the defective yarn and
Releases holding of defective thread by handle throw
Defective yarn removal method.