JPH0655979B2 - Weft processing method for shuttleless loom - Google Patents

Description

The present invention relates to a weft processing direction in a shuttleless loom such as a jet loom, a rapier loom, or a gripper loom.

(Prior art) With regard to shuttleless looms such as jet loom, we can expect much higher productivity than the shuttleless looms, and the tendency to adopt the shuttleless looms has been remarkable in recent years, but weft insertion errors have occurred. It is a well-known fact that the ratio is higher than that of the shuttlecock loom. When a weft insertion error occurs, the machine is stopped based on the weft insertion error detection signal from the weft detector, but in high-speed weaving machines such as a shuttleless loom, one machine revolution or more is taken into consideration to prevent damage to each part. Since the machine stand is stopped after the inertial operation, the weft thread which is miss-inserted (hereinafter referred to as a miss thread) is beaten and woven into the woven cloth immediately before the machine stand is stopped. Therefore, it is necessary to reverse the machine base to release the gripped state of the miss yarn by the warp yarn and remove the miss yarn. This operation of removing the miss yarn is performed manually or in JP-A-58-220856 and JP-A-59-21.
It is carried out by using a weft processing apparatus as disclosed in Japanese Patent No. 752, Japanese Patent Laid-Open No. 59-21757, and the like. JP-A-5
In JP-A-8-220856, the weft processing device moves to a predetermined miss yarn processing position along a rail laid in the weft width direction, and the miss yarn separating member (finger) in the device picks up a substantially elliptical orbit. While adhering to the cloth fell from outside the warp opening, the cloth enters the inside of the warp opening and separates a part of the miss yarn struck in the cloth into the warp opening. A part of the separated miss yarns is scraped off the warp and delivered to a drawing member inserted into the warp opening, and the warp is scraped from inside the warp opening and pulled out of the warp opening. A part of the miss yarns drawn out of the warp yarn opening is delivered to another drawing mechanism, and the same miss yarns in the warp yarn opening are all drawn out of the warp yarn opening and removed. JP-A-59-21752 and JP-A-59
According to Japanese Patent Laid-Open No. 21757/1999, a plurality of miss yarn separating members of the weft yarn treating device arranged at predetermined positions in the weft width direction rub the cloth on the cloth while sliding the cloth on the cloth cloth side, and make a mistake in the warp opening from the cloth cloth. Multiple parts of the thread are separated. That is, a plurality of parts of the miss yarn in the warp opening are relaxed in the gripped state by the warp, and the missed yarn in which the gripped state by the warp is relaxed is scraped off the warp from the warp opening by an appropriate pulling means, or in the weft width direction. It is pulled out toward the outside of the warp opening.

(Problems to be solved by the invention) In order to separate the miss yarn from the cloth fell, the maximum open state is formed during normal operation, and the miss yarn is held and relaxed by the warp, but the miss yarn is different from the normal weft yarn. Since it is struck in the woven fabric almost in the same manner, the state of gripping the miss yarn by the warp is not sufficiently relaxed even in the maximum open state. Therefore, it is not easy to manually remove the miss yarn, and the removing operation becomes very complicated, and the stop time of the loom becomes long and the productivity improvement required for the high-speed loom is hindered.

On the other hand, JP-A-58-220856 using a weft processing device.
In the miss yarn processing means of the publication, the miss yarn is pulled out to the outside of the warp opening without being loosened except for the portion of the miss yarn that is first pulled out to the outside of the warp opening. Even if the maximum open state is formed to alleviate the miss yarn grasping state by the warp yarn, the pullout resistance is extremely large. Therefore, conditions such as weaving width and thread quality are limited in order to avoid miss thread cutting due to pull-out resistance,
It is difficult to actually carry out a stable miss yarn processing operation.

JP-A-59-21752 and JP-A-59-21757
In the miss yarn processing means of the publication, the miss yarn is separated from the cloth fell at a plurality of portions and loosened, so that the pull-out resistance from the warp shed is relaxed as compared with the means disclosed in JP-A-58-220856. To be done. However, even if the maximum open state is formed during normal operation, the grasped state by the warp thread is not sufficiently released, so that the grasping action by the warp thread is still received at the portions other than the plurality of loosened portions, and the pullout at the time of misdrawing the thread Great resistance.

In addition, a miss yarn separating action must be performed in which the tip of the miss yarn separating member of each of the weft processing devices is inserted between the normal weft and the miss yarn woven in the woven cloth, but at the time of normal operation. Even if the maximum open state is formed, the state in which the miss yarn is grasped by the warp yarn is not sufficiently released. Therefore, the miss yarn separating member should be inserted between the weft yarn and the miss yarn while pushing the miss yarn from the cloth fell inside the opening. There is a risk that you will fail. In other words, as long as the influence of the gripping action by the warp is great, in order to achieve the extremely delicate operation of separating one miss yarn from the cloth fell of the woven fabric, it is possible to avoid complication of the mechanism of the device. However, there is a problem in that rapid processing and reliability cannot be obtained.

Structure of the Invention (Means for Solving Problems) Therefore, in the present invention, an opening angle exceeding the maximum opening angle formed during normal operation is formed at least near the cloth fell by the warp that opens and closes every weft insertion. The weaving state of the weft yarns woven into the woven fabric immediately before the machine stand is stopped by the formation of the opening angle is released, and the increase in the tension of the warp due to the formation of the opening angle exceeding at least the maximum opening angle is suppressed. The weft is separated from the above.

(Operation) That is, by forming an opening angle in the vicinity of the cloth fell that exceeds the maximum opening angle during normal operation, the weft yarn woven into the fabric immediately before the machine stand is released from the gripping action of the warp yarns. Therefore, the pull-out resistance when pulling out the weft from the inside of the warp opening to the outside of the warp opening through the space between the warp threads or pulling the weft out of the warp opening toward the weft width direction is greatly reduced, and the weft from the inside of the warp opening is reduced. Removal is done smoothly.

The formation of an opening angle exceeding the maximum opening angle during normal operation causes an abnormal tension in the warp, which is not desirable in weaving.However, the abnormal tension is avoided by sending out a certain amount of the warp or reversing the fabric winding side. It

Further, the reduction of the weft gripping force by the warp assists the hooking action of the weft separating member of the weft processor, and the weft that is largely released from the gripping action by the warp loosens due to its own tension and is usually adjacent to the same weft. A gap is likely to be formed between the weft and the weft. Therefore, the tip of the weft separating member of the weft processing device easily enters between the weft to be separated and the normal weft, and the weft separation using the weft processing device is successful at a high rate.

(Embodiment) An embodiment in which the present invention is embodied in a jet loom will be described below with reference to FIGS.

As shown in FIG. 1, the warp groups T1 and T2 sent out from the warp beam 61 are guided to the shedding system 64 side through the back roller 62 and the tension roller 63, and become a woven fabric W through the breast beam 65. And is wound around the winding roller 66. The roller 66 is operatively connected to a machine drive motor M capable of rotating in the forward and reverse directions, and is rotated in synchronization with the machine rotation.

A tension roller 63 is attached to one end of a detection lever 68 rotatably supported by a shaft 67, and a tension spring 63 is attached to the other end of the lever 68 so that the tension roller 63 causes the warp yarn group T1, The warp yarns are pressed against T2 and a predetermined tension is applied to the warp yarn groups T1 and T2. A magnet 70 is fixed to the other end of the detection lever 68, and a magnetic displacement sensor 71 is provided facing the magnet 70. The magnetic displacement sensor 71 is the same sensor 7.
The distance between 1 and the magnet 70 is converted into an electric signal, and the electric signal is sent to the control device 72.

The warp beam 61 is rotated by a drive motor 74 capable of forward and reverse rotation operatively connected to a warp beam shaft 73, and the motor 74 is driven by the magnetic displacement sensor 71.
Control device 72 for sending an operation command based on an electric signal from
The rotation speed is controlled by. That is, when the tension of the warp yarn groups T1 and T2 becomes higher than the set value F during the normal operation, the tension roller 63 moves downward and the distance between the magnet 70 and the magnetic displacement sensor 71 becomes large, and the warp yarn groups T1 and T1. When the tension of T2 becomes lower than the set value F, the tension roller 63 moves upward and the distance between the magnet 70 and the magnetic displacement sensor 71 becomes small, but an electric signal corresponding to this distance is sent to the control device 72. As a result, the control device 72 causes the warp groups T1, T
The rotational speed of the drive motor 74 is controlled in a direction of relaxing the yarn No. 2, and the rotational speed of the drive motor 74 is controlled in a direction of tensioning the warp yarn groups T1 and T2 in the low tension state.

The control device 72 also issues an operation command to the machine base drive motor M.

In FIG. 2, reference numeral 1A designates a plurality of heald frames (as shown in FIGS. 1, 10 to 12, in this embodiment, eight heald frames 1A, 1B, 2A, 2B, 3A, 3B,
4A and 4B are used), which are suspended by a suspension rope 7 which is tensioned by a tension spring 5 via a jack lever 6 to drive a loom drive shaft ( The cam action of the cam plate 8 rotated in synchronism with (not shown) is converted into vertical movement for each weft insertion via the cam lever 9 and the pull-down ropes 10A, 11A.
As a result, as shown in FIGS. 10 and 11, the warp groups T1 and T2 inserted through the heald frames 1A to 4B are inserted into the weft insert 1
Opening and closing openings are alternately repeated during the cycle.

As shown in FIGS. 2 and 3, both side frames 12 of the machine base,
A pair of support rails 14 and 15 are laid between the rails 13 in parallel and supported in the front and rear direction, and double guide rollers 16 and 17 (in the drawing, corresponding to each of the heald frames 1A to 4B) are supported between the rails 14 and 15. (Only rollers corresponding to the heald frame 1A are shown) are erected and supported. The pair of pull-down ropes 10A and 11A from the drive mechanism including the cam plate 8 and the cam lever 9 to the heald frame 1A are guided by the pair of double guide rollers 16 and 17 and then branched from the double guide roller 17 to separately guide rollers. 18, 1
It is connected to the heald frame 1A via 9. Between the double rollers 16 and 17, between the pair of front and rear support rails 14 and 15, a route changing device 20 capable of changing the route of the pull-down ropes 10A and 11A is erected and supported.
With the device 20, the paths of the pull-down ropes 10A and 11A can be vertically adjusted in position.

A similar opening / closing mechanism is configured in the other heald frames 1B to 4B.

As shown in FIG. 3, the route changing device 20 has the same number of air cylinders 21A, 21B, 22 as the heald frames 1A-4B.
A, 22B, 23A, 23B, 24A, 24B, which are supported side by side by a cover 25 and a support bracket 26 which are erected and supported between a pair of front and rear support rails 14, 15. The piston rods 27A and 27B of the air cylinders 21A to 24B project downward, and the double rollers 28A and 28B are rotatably supported at the tips of the rods 27 and 27B. The pull-down ropes 10A-11B of the respective heald frames 1A-4B are guided above the double rollers 28A, 28B,
During normal operation, the pull-down ropes 10A-11B are
As shown in FIG. 5, they are aligned at the same height position, and are bent and guided upward between the double guide rollers 16 and 17 as shown in FIGS.

The operation control of each of the air cylinders 21A to 24B is performed by independently opening and closing the same number of electromagnetic valves (not shown) corresponding to each of the air cylinders 21A to 24B. Opening and closing of each electromagnetic valve is for each heald frame 1A-4B
The height position detection in this embodiment is performed by detecting the rotational position of the cam plate 8.

As shown in FIGS. 7, 8 and 9, the weft Y passing through the weft measuring and storing device (not shown) is guided into the weft-inserting main nozzle 31 on the sley 30 which is reciprocally swung, and on the sley 30. The weft insertion is carried out from the main weft insertion nozzle 31 into the weft guide passage S formed in the modified reed 29 in synchronization with the weft insertion timing. When the weft yarn ejected from the weft insertion main nozzle 31 is properly wefted and reaches the end of the woven fabric W on the side opposite to the main nozzle side, the weft yarn is beaten and woven into the woven fabric W. At the same time, the woven cloth W is cut by a cutter 32 provided near the weft insertion main nozzle 31 side, and the subsequent weaving operation is continued.

If a weft insertion error occurs such that the weft does not reach the end on the side opposite to the main nozzle, a weft insertion detector (not shown) arranged in the vicinity of the end detects the weft insertion error and outputs from the detector. The machine base is stopped based on the weft insertion error detection signal.

After the weft insertion error detection signal (which is also a machine standstill signal) is issued, the machine stand rotates by inertia about once and then stops. That is, when a weft insertion error occurs, a weft insertion error detection signal is issued while the weft insertion main nozzle 31 moves forward from the last retracted position shown by the solid line in FIG. After Y'is beaten against the woven cloth W, the weft inserting main nozzle 31 further reciprocates and stops at the last retracted position.

As shown in FIG. 7, the cutter 32 includes a fixed blade 34 and a movable blade 35 mounted on a fixed shaft 33, and a cam lever 37 that is swung by a cam 36 that is rotated in synchronization with the machine base.
And the movable blade 35 are operatively connected to each other via a link 38, and the cutter 32 performs a cutting operation each time weft insertion. An electromagnetic solenoid 39 is arranged near the cam lever 37, and its drive rod 39a abuts on the cam lever 37,
The cutter 32 can be kept open. Instead of the electromagnetic solenoid 39, another actuator such as an air cylinder may be used as the cutter inactivating means. The electromagnetic solenoid 39 is operated on the basis of the weft insertion error detection signal so as to prevent the cutter 32 from cutting and separating the miss yarn Y '.

A weft processing device 40 is arranged in the vicinity of the last retracted position of the weft-insertion main nozzle 31, and the weft yarn Y1 ejected from the weft-insertion main nozzle 31 following the miss yarn Y'during the machine frame inertia operation. Is cut and separated from the weft-insertion main nozzle 31 and sucked and removed.

The weft processing device 40 will be described in detail. A fan-shaped blocking member 42 provided with a mesh is provided at the tip of a drive shaft 41 that is operatively connected to a drive mechanism (not shown), and based on the weft insertion error detection signal. Operated suction device 43
A suction pipe 44 connected to is disposed near the blocking body 42. A mounting arm 42a is formed at the lower part of the blocking body 42 by bending toward the weft insertion main nozzle 31 side, and a thin plate-shaped cutting body 45 is fixed to the arm 42a. On the other hand, a support bracket 46 is attached to the upper surface of the suction pipe 44 on the distal end side.
A cutting board 47 made of synthetic resin is fixed to the lower surface of the.
The blocking body 42 is always in the retracted position shown by the chain line in FIG. 7, and in this state, the upper end blade portion of the cutting body 45 is in contact with the lower surface of the cutting board 47.

The base end portion of the suction pipe 44 is bent and extended upward, and a second suction pipe 48 connected to a suction device (not shown) is disposed above the base end of the pipe 44. A weft detector 49 is installed in the pipe 48. A motor 50 is disposed between the suction pipes 44 and 48 on the side in the weft insertion direction, and a drive roller 51 fixed to a drive shaft 50a thereof is disposed near the suction pipes 44 and 48. Has been done. An air cylinder 52 is arranged laterally between the suction pipes 44 and 48 in a direction orthogonal to the weft inserting direction, and a driven roller 53 is provided between the bifurcated arms 52b fixed to the tip of a drive rod 52a thereof. Is rotatably supported. As shown in FIG. 7, the rollers 51 and 53 are always in a separated state, and the driven roller 53 is brought into pressure contact with the driving roller 51 by the protruding operation of the air cylinder 52. The motor 50 and the air cylinder 52 are operated based on the weft detection signal from the weft detector 49.

By the way, the control device 72 is provided with the following functions in addition to the functions described above. Machine base drive motor M
Is stopped based on a weft insertion error detection signal transmitted when a weft insertion error occurs. This weft insertion error detection signal is also input to the control device 72, and the control device 72 based on this input signal causes the warp yarn group T1. , T2 and the tension value F ′ that is lower than the set tension value F during normal operation, and the warp group T1,
A forward rotation operation command is sent to the beam drive motor 74 so that the tension of T2 becomes equal to or less than the set tension value F ', and the warp group T
The beam drive motor 74 is stopped when the tensions of 1 and T2 reach a predetermined tension value F '.

Further, when the machine base is restarted, the control device 72 sends a reverse rotation operation command to the beam drive motor 74, and the drive motor 74 is reversely operated until the tension of the warp groups T1, T2 reaches the set tension value F. When the warp yarn groups T1 and T2 obtain the set tension value F, the control device 72 sends a normal rotation operation command to the beam drive motor 74 and a normal rotation operation command to the machine frame drive motor M. There is.

In the present embodiment, when a weft insertion error occurs, the miss yarn processing is performed based on the miss yarn processing program. Therefore, the operation of the miss yarn processing when a weft insertion error occurs will be described below.

When a weft insertion error occurs, the miss yarn Y'is beaten as shown in FIG. 13, but the electromagnetic solenoid 39 is actuated by the weft insertion error detection signal, and the cutter 42 is released by the drive rod 39a protruding. Held in a state. Therefore, the miss yarn Y'is not cut and separated, and is returned to the last retracted position while being connected to the weft inserting main nozzle 31. The succeeding weft yarn Y1 is ejected from the main inertial moving weft insertion main nozzle 31. At this time, the drive mechanism and the suction device 43 (not shown) are operated based on the weft insertion error detection signal, and the mesh of the blocking body 42 is located at the weft blocking position shown by the solid line in FIG. It is arranged to rotate. The period in which the blocking body 42 is arranged in the weft blocking position is maintained until the end of the injection of the weft Y1, and the weft Y1 ejected from the main weft insertion nozzle 31 receives the jet fluid through the mesh in the weft insertion direction. To be The weft yarn Y1 which has been prevented from being inserted is the suction pipe 44.
And is sucked and introduced from the pipe 44 to the second suction pipe 48 side. After the end of the injection of the weft yarn Y1, the machine frame further rotates due to inertia and stops immediately before the beating.
After that, the machine base reverses almost halfway and stops again, and the weft-insertion main nozzle 31 is arranged at the last retracted position. That is,
The warp yarn groups T1 and T2 form an open state, and the woven state of the miss yarn Y'is released as shown in FIG. During this time, the cutting function of the cutter 32 is canceled and the weft Y1
And the cut separation between the miss yarn Y'and the miss yarn Y'is avoided.

After the machine base is stopped again, the heald frames 1A, 2A, 3 which are in the upward movement position based on the detection signal from the height position detector.
Air cylinders 21A, 22A, 23 corresponding to A, 4A
The piston rods 27A of A and 24A further protrude from the state shown in FIG.
The remaining air cylinders 21B corresponding to B, 3B and 4B,
The piston rods 27B of 22B, 23B, and 24B move in the retracted direction, and as shown in FIG.
Is placed and held in the upper moving position, and the double roller 2
8B is arranged and held in the downward movement position. As a result, the path of the pull-down ropes 10A, 11A connected to the heald frames 1A, 2A, 3A, 4A in the upward movement position is changed from the bending path of FIG. 5 to the substantially straight path of FIG. 6 between the double guide rollers 16, 17. Held frame 1 moved to the down position
Pull-down rope 10 connected to B, 2B, 3B, 4B
The paths B and 11B are further bent from the above bending path and transition to the bending path of FIG. Therefore, as shown in FIG. 12, the heald frames 1A, 2A, 3A, 4A in the upward movement position are shown.
Is further moved upward, and the heald frames 1B, 2B, 3B, 4B in the lower moving position are further moved downward,
As shown in FIG. 15, both warp yarn groups T1 and T2 form an opening angle α that exceeds the maximum opening angle β during normal operation.

On the other hand, based on the weft insertion error detection signal, the control device 72
Is a predetermined tension value F ′ that is lower than the set tension value F during normal operation.
And the tension of the warp yarn groups T1 and T2 corresponding to the electric signal input from the magnetic displacement sensor 71 are compared, and the warp yarn group T
The operation of the beam drive motor 74 is controlled in the direction of sending out the warp yarn groups T1 and T2 from the warp beam 61 until the tensions of T1 and T2 reach the tension value F '. When the tension of the warp yarn groups T1, T2 reaches the tension value F ', the operation of the beam drive motor 74 is stopped, and the tension of the warp yarn groups T1, T2 is maintained at the tension value F'which is lower than the set tension value F during normal operation. To be done. That is, by forming the opening angle α that exceeds the maximum opening angle β during normal operation, abnormal tension that originally exceeds the set tension value F is being applied to the warp group T1 and T2.
By sending a small amount of 1 and T2 from the warp beam 61, the occurrence of the abnormal tension is avoided.

After the machine base is stopped again, the blocking body 42 pivotally returns from the weft blocking position shown by the solid line in FIG. 7 to the retracted position shown by the chain line, and the cutting body 45 is struck on the lower surface of the cutting board 47 along with this returning operation. The weft Y1 is cut and separated from the main weft insertion nozzle 31. At this time, there is no cutting separation between the weft Y1 and the miss yarn Y ', and the miss yarn Y'is still connected to the weft Y1.

The weft Y1 sucked and introduced into the second suction pipe 48 through the first suction pipe 44 is detected by the weft detector 47, and the motor 50 and the air cylinder 5 are detected by this detection signal.
2 is activated. Therefore, as shown in FIGS. 6 and 9, the driven roller 53 is pressed against the drive roller 51 to hold the weft Y1 between the rollers 51 and 53, and the drive roller 51 is rotated to pull up the weft Y1. Weft Y1
As the yarn is pulled up and removed, as shown in FIG.
While being separated from the cloth fell W1 into the opening, it is drawn out from the inside of the warp opening toward the weft inserting main nozzle 31 side. Since the miss yarn Y'is driven into the cloth fell W1 as well as the weft yarn which is normally inserted, the miss yarn Y'by the warp yarn groups T1 and T2 is formed even if the maximum opening angle β is formed in the normal operation. Has a considerably large gripping force, and a great resistance is involved in separating the miss yarn Y'from the cloth fell W1. However, by forming an opening angle α that exceeds the maximum opening angle β during normal operation and further reducing the tension of the warp yarn groups T1 and T2 to a tension value F ′ that is less than the set tension value F, the warp yarn groups T1 and T2 Miss thread Y '
The gripping force is greatly reduced, and the separation resistance when separating the miss yarn Y ′ from the cloth fell W1 is significantly suppressed. Therefore, the pull-out resistance of the miss yarn Y ′ drawn out from the inside of the warp yarn to the outside of the warp yarn opening along the weft insertion direction is small, and the miss yarn Y ′ is smoothly cut without the cutting of the miss yarn Y ′ due to the pull-out resistance. Removal is done. By reducing the pull-out resistance as described above, it is possible to use a weft yarn having a weak yarn strength or to form a wide woven fabric.

When all the miss yarns Y'are pulled out from the warp yarn opening and sucked and removed by the second suction pipe 48, the electromagnetic solenoid 39, the suction device 43, a suction device (not shown), and the air cylinder 52 return to the initial state, The piston rods 27A and 27B of the air cylinders 21A to 24B in the path changing device 20 return from the state shown in FIGS. 4 and 6 to the initial state shown in FIGS. 3 and 5, and the heald frame 1A.
4B are arranged at the maximum opening formation position during normal operation.
At the same time, a reverse rotation operation command is sent from the control device 72 to the beam drive motor 74, and the motor 74 is reversely operated. With the reverse rotation of the beam drive motor 74, the warp yarn groups T1 and T2 in a relaxed state become tense. When the tensions of the warp groups T1 and T2 reach the set tension value F during the normal operation, the control device 72 sends a normal rotation operation command to the beam drive motor 74 and a normal rotation operation command to the machine frame drive motor M. , Normal operation is resumed.

The formation of the opening angle α which exceeds the maximum opening angle β during the normal operation, which is performed from the machine stop due to the occurrence of weft insertion error to the machine restart, is performed from the warp beam 61 to the warp group T1, as in this embodiment. Unless a warp tension reducing means such as sending out a small amount of T2 is applied, an abnormally high tension far exceeding the set tension value F during normal operation is generated. Such abnormal tension induces unfavorable conditions in weaving, such as warp cutting and warp extension that leads to displacement of the cloth fell position when the machine is restarted, resulting in a reduction in operating efficiency or a reduction in woven fabric quality. However, the opening angle α that exceeds the maximum opening angle β during normal operation
In this embodiment, which suppresses the occurrence of the abnormally high tension associated with the formation of the warp, the tension of the warp groups T1 and T2 is suppressed to a tension value F ′ that is lower than the tension value F set during normal operation. Such a problem does not occur. Of course, the tension value F'may be equal to the set tension value F. In this case as well, the pull-out resistance of the miss yarn Y'is sufficiently reduced, and the warp cutting,
Phenomena such as warp stretching are avoided.

In this embodiment, the miss yarn Y'in the warp shed is pulled out by the weft treatment device 40 from the inside of the warp shed to the outside of the warp shed, and is removed.
A method for separating the miss yarn Y'from the cloth fell W1 to the warp shed side by a weft treatment device as disclosed in Japanese Patent Publication No. 856, Japanese Patent Laid-Open No. 59-21752 or Japanese Patent Laid-Open No. 59-21757 is adopted. May be. In such a weft processing device, the weft separating member slides on the woven cloth and rubs against the cloth cloth,
The tip of the separating member enters between the miss yarn and the weft yarn inserted one cycle before, but by forming an opening angle α that exceeds the maximum opening angle β during normal operation, the mistake from the cloth fell W1 The separation resistance of the yarn Y'is significantly reduced, and the weft separating member is effectively hooked. That is, when the tip of the weft separating member slides on the woven fabric W and reaches the position of the miss yarn Y ', the tip pushes the miss yarn Y'in the direction away from the cloth fell W1 to form the miss yarn Y'. Although it enters the gap formed between the weft yarn and the weft yarn, the gripping force by the upper and lower warp yarn groups T1 and T2 is greatly suppressed, so that the miss yarn Y ′ can be easily separated from the cloth fell W1. Therefore, the tip of the weft separating member easily enters between the miss yarn Y'and the weft, and the miss yarn separation from the cloth fell W1 to the warp opening side is successful at a high rate. As long as the influence of the gripping action by the warp is great, in order to achieve the extremely delicate operation of separating one miss yarn from the cloth fell of the woven fabric, it is inevitable that the weft processing device has a complicated mechanism. Moreover, there is a problem that quick processing and reliability cannot be obtained, but such a problem is solved by significantly suppressing the influence of the gripping action of the warp.

Further, due to the reduction of the gripping force by the warp yarn groups T1 and T2, the miss yarn Y'contracts by its own tension, and a gap is formed between the cloth fell W1 and the miss yarn Y'which works effectively for the separating action of the weft separating member. Is also performed by the contraction.

In the above-mentioned embodiment, the miss yarn Y'is pulled out from the inside of the warp yarn to the outside of the warp yarn opening by the weft processing device 40 along the weft insertion direction. May be.

Of course, the present invention is not limited to the above-mentioned embodiment, and for example, the installation position of the route changing device 20 in the above-mentioned embodiment is changed to an appropriate position other than the above-mentioned embodiment, or an air cylinder of the device 20 is replaced. Adopting an electromagnetic solenoid, linear motor, rack-pinion mechanism, etc., or adjusting the height position of either the upper or lower heald frame to form an opening angle that exceeds the maximum opening angle during normal operation, Contrary to the case of the above-mentioned embodiment, the present invention can be applied to the depolarizing opening device of the type in which the heald frame is pulled up against the spring force.

Further, the embodiment shown in FIG. 16 is also possible as an opening angle forming means that exceeds the maximum opening angle during normal operation. In this embodiment, the start end of the pull-down rope 54 is connected to the piston rod 55a of the hydraulic cylinder 55 mounted on the side frame 12 of the machine base, and the intermediate portion of the pull-down rope 54 is linked to the cam lever 9 via the roller 56. ing. Therefore, by adjusting the protruding position of the piston rod 55a, the height position of the heald frame can be adjusted as in the above-described embodiment, and the opening angle exceeding the maximum opening angle during normal operation can be formed.

As a method of forming an opening angle exceeding the maximum opening angle during normal operation, in addition to adjusting the height position of the heald frame, it is possible to insert a rod into the warp opening and expand the opening only near the cloth fell.

On the other hand, as a method of suppressing the occurrence of abnormal tension accompanying the formation of the opening angle α exceeding the maximum opening angle β during normal operation, other than the above-described embodiment, for example, the winding roller may be rotated in the reverse direction, the warp beam feeding rotation and The back roller, tension roller or breast beam is temporarily displaced in a direction to reduce the warp tension only when the miss yarn is processed by using the reverse rotation of the take-up roller together or by displacing the back roller, tension roller or breast beam. Etc. are possible.

Further, the present invention can be applied not only to the processing of the miss yarn but also to the case where the weft yarn inserted into the weft yarn during the inertial operation immediately before the machine base is stopped by the artificial machine stop is separated from the woven cloth.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention in which the weft processing is performed by forming the opening angle exceeding the maximum opening angle in the normal operation, the occurrence of abnormally high tension which is unfavorable in weaving and which is associated with the opening formation. While avoiding this, the weft gripping force of the warp is reduced to suppress the weft separation resistance from the cloth cloth, and a smooth weft removal process is possible in any case where the weft is removed from the warp shed manually or by a processing device. Produce the effect.

[Brief description of drawings]

1 to 15 show an embodiment embodying the present invention. FIG. 1 is a schematic side view of the entire loom, FIG. 2 is a front view of a shedding device, and FIG. 3 is A- in FIG. A line enlarged sectional view, FIG. 4 is a longitudinal sectional view showing a change from FIG. 3, FIG. 5 and FIG. 6 are front views of main parts showing a route change of the pull-down rope, and FIG. FIGS. 8 and 9 are schematic plan views for explaining the miss thread removing action, FIGS. 10 to 12 are vertical cross-sectional views of the heald frame showing the action of forming the opening angle, and FIGS. FIG. 16 is a front view showing another example of means for forming an opening angle exceeding the maximum opening angle at the time of normal operation. Held frame 1A, 1B, 2A, 2B, 3A, 3B,
4A, 4B, tension spring 5, cam plate 8 that constitutes a drive mechanism
And cam lever 9, pull-down ropes 10A, 10B, 1
1A, 11B, warp beam 61, control device 72, beam drive motor 74, warp groups T1, T2, maximum opening angle β, opening angle α during normal operation, set tension value F, tension value F ', miss yarn Y'. .

Claims (1)

[Claims] 1. An opening angle exceeding a maximum opening angle formed during normal operation is formed at least near the cloth fell by a warp that opens and closes every weft insertion, and by this opening angle formation, it is woven into the woven fabric immediately before the machine stand is stopped. The weft processing method in a shuttleless loom in which the weaving state of the weft is released and the tension increase of the warp due to the formation of an opening angle exceeding at least the maximum opening angle is suppressed, and then the weft is separated from the front of the woven fabric. .