JPS633985B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for treating weft yarns when a shuttleless loom, more particularly an air jet loom or a water jet loom, is stopped.

(Prior art) In order to speed up weaving operations, air jet looms or water jet looms are used in which the measured weft threads are inserted into a shed formed between the upper and lower warp threads using a jet nozzle. . In such high-speed looms, since the weaving speed is high, the impact of stopping the loom on productivity decline is more significant than in conventional looms. Therefore, it is desirable that the stoppage time in the jet room be as short as possible. On the other hand, in jet looms, unlike conventional shuttled looms, the weft threads are moved through the shed by air or fluid such as water without using a shuttle, so weft insertion errors are more likely than in shuttled looms. easy. That is, the weft yarn may not be supplied from the jet nozzle, a so-called weft supply error, or the weft yarn may be supplied from the jet nozzle but not reach the selvage yarn on the opposite side of the jet nozzle, a so-called conveyance error.

In addition, in jet looms that operate at high speeds, even if the loom is stopped immediately after a weft insertion error is discovered, in order to prevent parts of the loom from being damaged due to excessive deceleration, The timing is selected so that the machine stops after approximately one cycle of inertial operation after a mistake is detected. Therefore, conventionally, when the jet loom is stopped due to a weft insertion error signal, the next weft insertion cycle is completed before the jet loom stops. Therefore, it is necessary to reverse the machine and remove not only the weft yarn in which the weft insertion error occurred, but also the weft yarns inserted in the cycle after the weft insertion error.
By the way, the weft inserted immediately after a weft insertion error is beaten like a normal weft and is firmly held in the woven fabric, so it cannot be easily removed and the removal work is extremely troublesome.

Additionally, if the warp threads (including the selvage threads) are cut during weaving work or the loom is turned off due to manual operation, the loom will run for about one cycle due to inertia for the same reason as mentioned above. Stop after. If an attempt is made to remove the weft inserted during this inertial movement in order to prevent defects such as weaving steps from occurring in the woven fabric, it is not easy to remove it for the same reasons as mentioned above.

(Problems to be Solved by the Invention) Japanese Utility Model Publication No. 56-17503 discloses that when inserting the weft immediately after restarting operation, the weft inserting air flow emitted from the main jet nozzle and the auxiliary jet nozzle is used to insert the weft inside the warp opening. It is disclosed that the defective weft yarns are blown off to the reflection side of the main jet nozzle. However, with this configuration, it is difficult to reliably remove defective weft yarns. Moreover, it is necessary to carry out the removal work within an extremely short period of time, which is the time of weft insertion, resulting in a lack of reliability.

In addition, Japanese Patent Publication No. 56-27621 discloses that a defective weft yarn that has been reeded in the warp shedding and woven into a woven fabric, and that has been cut and separated from a water jet nozzle, is provided with air that is placed below the woven fabric. A jet nozzle blows an air stream from below the warp group to release the defective weft yarns from the woven fabric, and a suction nozzle enters the warp opening from the side of the woven fabric to suction and remove the defective weft yarns. It is disclosed that However, there is a problem in that it is difficult to release defective weft yarns that are tightly woven into the woven fabric using only the air flow from the air injection nozzle, and the defective weft yarns cannot be reliably removed.

It is an object of the present invention to provide a method that can automatically remove erroneous weft yarns when the jet loom is stopped as described above.

(Means for Solving the Problems) In the present invention, the warp threads are opened in order to free the inserted weft threads immediately before the loom stops, and the weft threads are inserted into the woven fabric before restarting the loom operation. In the weft processing method, after the loom sends a stop signal, the loom stops without cutting the weft so that it continues from the main air jet nozzle, and the time until the loom stops. Weft insertion is prevented, and the weft yarn whose weft insertion is prevented is suctioned by a suction nozzle disposed between the warp yarn and the main air jet nozzle, and the weft yarn in a free state is sucked into the suction nozzle. The above-mentioned object is achieved by a method for treating the weft yarn when the jet loom is stopped, in which the weft yarn is pulled out and removed.

(Embodiments) The present invention will be described in detail below with reference to embodiments of the accompanying drawings. In the present invention, even after beating, if the warp of the loom is opened and the last inserted weft is free, the weft is slightly separated from the woven fabric, and there is a gap between the weft and the woven fabric. We focus on the formation of small gaps. That is, in the present invention, the warp threads of the loom are in an open state, and in this open state, as shown in FIG. 3a, the extrusion member 5
The tip 53a of the cloth is brought into light contact with the woven fabric and moved along the woven fabric a distance of one or two wefts to several centimeters in the direction of the front of the fabric. Since the upper and lower warp threads 21a and 21b are open and the weft thread 44b inserted last is free, a small gap is formed between the weft thread 44b and the weft thread 44a in the woven fabric as described above. For this reason, the tip 53a of the extrusion member 53 that has moved in contact with the woven fabric is pressed down, and the woven fabric and the weft 4 are pressed down.
It can be inserted into the small gap between 4b (3rd
(see figure b). By further moving the extrusion member 53 in a direction away from the woven fabric, the weft yarn 44b is separated from the woven fabric, and as a result, the weft yarn 44b can be easily removed by an appropriate pulling means or by hand.

The tip of the extrusion member 53 is preferably slid along the woven fabric over a distance ranging from one or two wefts to several centimeters. This means that even if the weaving front position changes slightly back and forth depending on the weaving structure, or even if the weaving front position changes slightly in the weaving width direction of the same woven fabric, the small distance between the woven fabric and the final weft inserted weft is small. Extrusion member 5 in the gap
This is to ensure that the tip of No. 3 is inserted reliably and that the final weft inserted weft can be reliably extruded. Therefore, when the above-mentioned fluctuations are small, the sliding distance can be made extremely small.

An apparatus for carrying out the above method will now be described with reference to FIGS. 1, 2 and 4. FIG. 1 is a side view showing an outline of the drive system of the air jet room according to the present invention.
Power is transmitted from the crankshaft 1 to the crankshaft 15 via a transmission member such as a V-belt 13. The crankshaft 15 drives the yarn beam 19 via the transmission 17 to unwind the warp threads 21, and also causes the surface roller 31 to frictionally drive the winding roller 32 to wind up the woven fabric 33. The above transmission 17
The gear ratio is adjusted according to the displacement of the tension roller 23, and the tension of the warp threads let out via the back roller 22 is set to a predetermined value. crankshaft 15
moves the heald frame 24 up and down to cause the warp threads 21 to perform a required shedding motion. Further, the locking shaft 29 supports the sled 27 via the sled sword 28, and the sled 27 supports the reed 25 and the weft insertion guide 2.
6 is installed. The crankshaft 15 moves the reed 25 and the weft insertion guide 26 between the solid line position and the broken line position via the locking shaft 29, whereby the reed 25 beats the inserted weft yarn. The above configuration is the same as a conventional air jet room.

Next, the weft insertion mechanism will be explained with reference to FIG.
The weft yarn 44 is unwound from the cheese 41 through the tensor 42 by the feed roller 43, and then passed through the air nozzle 4.
5 and is stored in the boule pipe 46. The length measuring drum 50 is interlocked with the crankshaft 15 (Fig. 1), and also frictionally drives the feed roller 43.
A predetermined length of the weft yarn 44 is measured by the feed roller 43 in accordance with the rotation of FIG. 4 and is supplied to the air nozzle 45. The pool pipe 46 has an axial slit 47 on one side.
The weft yarn 44 stored therein can be taken out through the slit 47. Note that instead of the above-mentioned length measuring and storage mechanism combining a feed roller and a pool pipe, for example, Japanese Patent Laid-Open No. 57-16946 and Japanese Patent Laid-Open No. 56
The length measuring storage mechanism disclosed in Japanese Patent No. 58028, in which a weft is wound around the circumferential surface of a length measuring drum and the unwinding from the length measuring drum is controlled, may be used.

A gripper 48 is provided between the pool pipe 46 and the main air jet nozzle 49 to control the supply of the weft yarn 44 from the pool pipe 46 to the main air jet nozzle 49. The main air jet nozzle 49 is connected to the crankshaft 15 (first
Compressed air is injected in synchronization with the rotation of the weft 44 shown in FIG.

Near the selvage yarn on the opposite side of the main air jet nozzle 49, there are detectors 51, 52 of an appropriate type such as photoelectric type, mechanical type, or fluid type for detecting whether or not the weft yarn 44 is reliably inserted. It is detected that the weft yarn 44 is being reliably supplied from the main air jet nozzle 49, for example, in accordance with the method described in Japanese Patent Publication No. 54-21475.

A known ejector type suction nozzle 61 is provided between the main air jet nozzle 49 and the selvage thread, which generates a suction force by the action of compressed air. A suitable reciprocating member 62 such as an air cylinder or an electromagnetic solenoid is connected to the suction nozzle 61, and the operation of the reciprocating member 62 causes the tip of the suction nozzle 61 to be injected from the main air jet nozzle 49. It is possible to move between a position away from the weft path and a position near the weft path.

A guide plate 63 is fixed to the tip of the suction nozzle 61, and when the suction nozzle 61 retreats, the guide plate 63 is out of the weft path, and when the suction nozzle 61 moves forward, the guide plate 63 63 intersects with the weft path. A bellows-type expansion joint 66 is connected to the rear end of the suction nozzle 61 to allow the suction nozzle 61 to move smoothly. In addition,
The suction nozzle 61 and the guide plate 63 integrally formed therewith are not limited to those that move in the front-rear direction of the loom, but may be of a type that rotates in the vertical direction, for example.

65 is a valve that controls the jetting of air into the suction nozzle 61. An auxiliary gripper 72 is provided between the main air jet nozzle 49 and the gripper 48 and is opened and closed by an electromagnetic solenoid 71 or an air cylinder (not shown). 73 is a photoelectric type, mechanical type, or fluid type feeler.

The feed load 43 described above is rotatably supported at the tip of an arm 83 that is rotatably supported around a pin 81. A spring 85 is stretched over the end of the arm 83 opposite to the end supporting the feed roller 43, and is biased so that the arm 83 always comes into contact with the piston of the air cylinder 86 or the tip of the armature of the electromagnetic solenoid. Therefore,
Due to the action of the spring 85 and the air cylinder 86, the feed roller 43 is pressed against the length measuring drum 50 and driven by friction, and the length measuring drum 50
It is possible to take a state in which it is separated from the length measuring drum 50 and is not driven by the length measuring drum 50. 87 is length measuring drum 5
This is a brake shoe for braking by frictionally contacting the feed roller 43 that has been separated from the feed roller 43.

A weft cutting cutter is provided on the machine base.
In this weft cutting cutter, a cam 102 is fixed to a shaft 101 that rotates in conjunction with a crankshaft. Further, the lever 105 is rotatable around a shaft 104, and a cam follower 103 supported by the lever 105 is moved by a spring 106 to move the cam 1
It is pressed to 02. The cam 102 swings the lever 105 and rotates the movable blade 109 around the pin 116. During steady operation, the fixed blade 108 and the movable blade 109 cut the weft held in the grip recess 112 of the guide 111, as shown in FIG. 6a. On the other hand, when a stop signal is transmitted, the armature of the electromagnetic solenoid 113 retreats, and the cutting prevention member 110 connected to the armature by a pin 114 rotates clockwise around the pin as shown in FIG. b). The cutting prevention member 110 and the L-shaped prevention guide 115 are aligned, and as a result, the weft yarn is not held in the recess 112 and is not cut between the movable blade 109 and the fixed blade 108.

Next, the structure of the extrusion member will be explained with reference to FIG. 4. A beam member 76, which is longer than the weaving width of the loom, is supported at both ends by a pair of vertical rods 74 (FIG. 4), and is installed above or below the woven fabric of the loom. The beam member 76 has one arm member 54 at the center of the weave width, or a plurality of arm members 54 spaced apart in the weave width direction, depending on the weave width, weave structure, thread material, and the movement stroke of the arm member in the front and back direction. is fixed, and a push-out member 53 is rotatably attached to the tip of the arm member 54 with a pin 55. The tip of a bolt 78 screwed into a bracket 77 integrally protruding from the arm member 54 near the ear engages with a protrusion 74a formed on the vertical rod 74, so that the arm member 54 moves integrally with the vertical rod 74. . The spring 79 is a spring that biases the tip of the bolt 78 in the direction of the projection 74a, and the bolt 78 is pushed toward the projection 74a.
When the arm member 54 is away from the arm member 54, the spring 79 applies an appropriate downward force to the arm member 54. A bolt 57 is screwed into a bracket 56 integrally formed on each arm member 54, and an extrusion member 53 whose tip is shaped like a square is formed.
I try to press the back of the. The spring 58 presses the extrusion member 53 against the bolt 57.

Note that if the arm member 54 near the ear and the vertical rod 74 are far apart, an auxiliary arm member (not shown) having a shape similar to the arm member 54 may be fixed to the beam member 76 near the vertical rod 74. Then, the bracket 7 is removed from the auxiliary arm member.
7 may be made to protrude, and a spring 79 may be stretched between the auxiliary member and the vertical rod 74.

A vertical rod 74 is rotatably supported around a support shaft 75, and a piston rod 68 of a fluid pressure cylinder 67 such as an air cylinder is connected to the lower end of the vertical rod 74 by a pin 69. The hydraulic cylinder 67 has a pin 64
It is supported by a frame. Note that the fluid pressure cylinders may be provided on both sides of the loom frame.
Alternatively, as shown in FIG. 2, it may be provided only on one side.

Next, an embodiment of the weft processing method at the time of abnormal stop of the present invention will be described. The heald frame 24 is moved to open, and the weft yarn 44 is inserted into the shed formed between the upper and lower warp yarns 21. That is, in FIG. 2, cheese 41
The weft yarn 44 unwound from the tensor 42 is
After being measured by the feed roller 43 which rotates in accordance with the rotation of the crankshaft 15 (FIG. 1), it is stored in the pool pipe 46 by the air nozzle 45 (FIG. 2). The gripper 48 and the main air jet nozzle 49 provided between the pool pipe 46 and the main air jet nozzle 49 are operated and controlled in synchronization with the rotation of the crankshaft 15 (FIG. 1). Compressed air injected from the pool pipe 49 inserts the weft yarn 44 stored in the pool pipe 46 into the shed formed between the upper and lower warp yarns 21.

Detectors 51 and 52 installed near the selvedge threads on the opposite side from the main air jet nozzle 49 detect the warp threads 21
Check the weft insertion condition when the shed is almost closed (crank angle 250 to 300 degrees), and if the weft is inserted into the shed for some reason, the main air jet nozzle 4
If a weft insertion error occurs in which the selvage yarn does not reach the opposite side of the weft thread 9, the detectors 51 and 52 issue a weft insertion error signal. In response to this weft insertion error signal, the operation of the motor 11 (FIG. 1) that drives the machine base is stopped, and the machine enters inertial operation.

Further, when a weft insertion error signal is transmitted, the piston of the reciprocating member 62 advances to cause the guide plate 63 fixed to the tip of the suction nozzle 61 to cross the weft path. In this way, the weft yarn ejected from the main air jet nozzle 49 after a weft insertion error is guided by the guide plate 63, reaches the suction nozzle 61, and is sucked into the suction nozzle 61.

Further, the cutting function of the weft thread cutting cutter is temporarily disabled, so that the weft threads that have been mis-inserted are piled up from the jet nozzle. That is, as shown in FIG. 6b, the cutting prevention member 110 connected to the armature by the pin 114 is rotated clockwise around the pin (see FIG. 6b). Cutting prevention member 1
10 and the L-shaped blocking guide 115 are aligned. As a result, the weft yarn is not held in the recess 112 and is not cut between the movable blade 109 and the fixed blade 108.

Therefore, weft insertion after the weft insertion error signal is sent is prevented, and the weft threads flow from the shed to the main air jet nozzle 49 via the suction nozzle 61.

After the machine has moved for about one cycle due to inertial operation, the warp threads 21 are almost closed (crank angle of about 300
degree).

Next, prepare for a reversal. That is, the main air jet nozzle 49 is rendered inoperative. The gripper 48 is closed, or the auxiliary gripper 72 is closed by the electromagnetic solenoid 71. Further, the air cylinder 86 is operated to separate the feed roller 43 from the length measuring drum 50, thereby disabling the weft supply mechanism. On the other hand, the piston of the reciprocating member 62 is moved backward to remove the guide plate 63 at the tip of the suction nozzle 61 from the weft path. In this state, the drive motor 11
(Fig. 1) or by operating an auxiliary motor (not shown) provided separately from the drive motor 11 to reverse the machine frame approximately 480 degrees.
1 is open (crank angle approximately 180 degrees).

In the present invention, in this open state, the extrusion member is inserted into the small gap between the weft and the woven fabric in response to an extrusion start signal, so that the machine automatically pulls the weft that has been inserted incorrectly from the woven fabric. . In addition,
The extrusion start signal may be sent by a timer when a predetermined time elapses after the stop signal such as the weft insertion error signal mentioned above is sent, or it may be sent by a signal from a limit switch, etc. when the machine is reversed and the machine is in the open state. Alternatively, the call may be made manually by pressing a button.

During steady operation, the piston rod 68 of the fluid pressure cylinder 67 is projected, and the vertical rod 74 is rotated clockwise about the support shaft 75, as shown in FIG. 4a. The tip of the bolt 78 is engaged with the protrusion 74a, the tip of the bolt 57 is engaged with the back surface of the extrusion member 53, the tip of the extrusion member 53 is separated from the woven fabric, and the extrusion member 53 is engaged with the weaving work of the jet room during steady operation. does not interfere in any way.

In response to the aforementioned stop signal, the loom is stopped, the upper and lower warps 21a and 21b are stopped in an open state, and when the extrusion start signal is issued, the piston rod 68 of the fluid pressure cylinder 67 retreats. As a result, the vertical rod 74 rotates counterclockwise around the support shaft 75. At this time, until the tip of the extrusion member 53 comes into contact with the woven fabric (see FIG. 4b), the extrusion member 53,
The arm member 54 and the vertical rod 74 rotate together. However, when the pusher member 53 contacts the fabric, the downward movement of the pusher member 53 is blocked, the pusher member 53 pivots about the pin 55, and the pusher member 53 separates from the bolt 57. As a result, the spring 58 causes the tip of the extrusion member 53 to come into contact with the fabric with a predetermined pressing force.

The piston rod 68 of the fluid pressure cylinder 67 is further retreated, the vertical rod 74 is further rotated counterclockwise, and the tip of the extrusion member 53 slides on the fabric with an appropriate pressing force.

When the tip of the push-out member 53 reaches the small gap between the woven fabric and the final inserted weft yarn 44b (see FIGS. 3a and 3b), the spring 58 and, in some cases, the spring 7
Due to the spring force of 9, the tip of the push-out member 53 enters the small gap (see FIG. 4c). In this state, by further retracting the piston rod 68 of the fluid pressure cylinder 67, the pushing member 53 moves the weft 44b
pull it away from the fabric.

Since the weft threads separated in this way are no longer held tightly against the warp threads, they can be removed by suitable pulling means such as the suction nozzle 61.
Alternatively, it can be easily pulled out and removed to the side of the shed by hand.

After removing the weft threads in this manner, the machine is turned over approximately 270 degrees until the warp threads 21 are closed (crank angle approximately 270 degrees) by switching on automatically or manually, and the air jet loom is activated. as appropriate.

Next, the main air jet nozzle 49 is put into operation. The electromagnetic solenoid 71 is de-energized to open the auxiliary gripper 72, while the gripper 4
8 is also assumed to be in a steady operating state. Furthermore, the piston of the air cylinder 86 is moved backward, and the feed roller 43
is pressed against the circumferential surface of the length measuring drum 50 to put the weft supply mechanism into operation. In this state, restart the air jet room operation.

In the above-mentioned embodiment, even if the weaving front position changes slightly back and forth depending on the weaving structure, or even if the weaving front position changes slightly in the weaving width direction of the same woven fabric, the woven fabric and the final weft insertion weft In order to reliably insert the tip of the extrusion member 53 into the small gap between the wefts and to reliably extrude the final weft inserted weft, the tip of the extrusion member 53 is slid over a considerable distance along the woven fabric. I'm letting you do it. However, when the above-mentioned fluctuations are small, the tip of the extrusion member 53 may aim at and enter a small gap between the woven fabric and the weft, as shown in FIG. In this case as well, the extrusion member 53 is connected to the vertical rod 74 by the flexible member 88 as described above, and the tip of the extrusion member 53 is slightly (distance of one or two wefts) from the woven cloth. It is preferable that the tip of the push-out member 53 contacts the woven fabric by bending the flexible member 88, moves the short distance, and enters the small gap.

In the above explanation, an example of repairing a weft thread that has been inserted incorrectly has been explained, but the present invention can
It can also be applied when the air jet room stops due to a selvage breakage or human operation.

Note that the suction nozzle described above generates suction force by the ejector action of compressed air. However, the suction nozzle is not limited to one based on ejector action, and for example, a suction nozzle connected to a suction source to generate suction force may be employed.

(Effects of the Invention) According to the present invention, it is possible to reliably remove the weft yarn when the jet loom is stopped, and it is possible to completely or almost completely automate the weft yarn removal.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an outline of the drive system of an air jet room according to the present invention, Fig. 2 is a schematic plan view of a device implementing the present invention, and Figs. 3 a and b explain the principle of the present invention. Figures 4a, b, and c are side views of an apparatus for implementing the present invention, Figure 5 is a side view of another apparatus for implementing the present invention, and Figures 6a and b are side views of the apparatus for implementing the present invention. FIG. 3 is a side view of a weft cutting cutter provided in the device. 11... Drive motor, 15... Crankshaft, 24... Heald frame, 25... Reed, 26... Weft insertion guide, 43... Feed roller, 44... Weft, 46... Pool pipe, 48... Gripper ,
50...Length measuring drum, 49...Main air jet nozzle, 51, 52...Detector, 53...Extrusion member, 54...Arm member, 61...Suction nozzle, 62...Reciprocating member, 63...Guidance plate, 6
4...Cutter for cutting the weft thread, 67...Fluid pressure cylinder, 74...Vertical rod.

Claims (1)

[Scope of Claims] 1. A weft treatment in which the warp is opened to free the inserted weft just before the loom stops, and the weft is removed from the woven fabric before restarting the loom. In the method, after the loom sends a stop signal, the loom stops without cutting the weft threads so that the weft threads are connected to the main air jet nozzle, and weft insertion is prevented until the loom stops, and the weft insertion is performed. The weft yarns that have been blocked are suctioned by a suction nozzle disposed between the warp yarns and the main air jet nozzle, and the free weft yarns are pulled out and removed while being suctioned by the suction nozzle. How to handle weft threads when the jet loom is stopped. 2. In order to free the weft inserted immediately before the stop, the stop signal causes the pushing member to slide along the woven fabric from the woven fabric side toward the front of the woven fabric;
2. The weft processing method when the jet room is stopped as claimed in claim 1, wherein the pushing member is inserted between the inserted weft and the woven fabric immediately before the machine stops, and the weft is separated from the woven fabric. 3. The weft processing method when a jet loom is stopped according to claim 1 or 2, wherein the extrusion members are provided at intervals in the weaving width direction of the loom.