JP2009299198A - Method for operating weft pull back device in fluid jet loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To pull back a weft so as not to fall out from a weft-inserting nozzle during stopping of a fluid jet loom. <P>SOLUTION: A controller 31 switches a high-speed drive mode of a weft pull back device 22 during weaving operation to a low-speed drive mode during stopping the weaving operation by a stop signal of the loom. For example, when a defective weft-removing operation is carried out during stopping, the controller 31 transmits a command of the number of revolutions for the low-speed drive mode to a driver 30. Since the driver 30 drives a stepping motor 26 having a changed pulse rate corresponding to the command of the number of revolutions for the low-speed drive mode, a movable member 29 is displaced at low speed from a weft pull-back position to a weft release position to eliminate the bent state of the weft Y. Since when the defective weft-removing operation is completed, the controller 31 transmits a command of the number of revolutions on the basis of the low-speed drive mode to the driver 30, rotates the stepping motor 26 at a low speed and the movable member 29 is displaced from the weft release position to the weft pull-back position at a low speed, the weft Y1 is accurately pulled back in a stable state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for operating a weft pullback device disposed on a weft pullout side of a weft storage device.

  In a fluid jet loom (hereinafter simply referred to as a loom), for example, a weft pullback device as disclosed in Patent Document 1 is provided. The weft pullback device is generally arranged between the weft draw-out side, which is the downstream side of the weft storage device, and the weft insertion nozzle. The movable member bends the weft from the weft feed path and pulls it back. The purpose of the weft pullback is to shorten the weft length protruding from the tip of the weft insertion nozzle by slightly pulling back the weft after the weft insertion during the weaving operation, and to stabilize the next weft insertion. Accordingly, the weft pullback device is set so that the weft pullback position of the movable member is maintained until the next weft insertion is started after the weft insertion is completed. For this reason, in the case of a loom stopped at a timing other than the weft insertion timing, the movable member is maintained at the weft pullback position even during the stop.

  While the loom is stopped, for example, repair work caused by defective weft insertion or defective feeding, removal work of defective wefts, seam discharge work when the yarn feeder is switched, and 1-pick weft insertion work after removing defective wefts When performing the above, it is necessary to inject the weft from the weft insertion nozzle. For this reason, the weft pullback device is set to maintain the movable member in the working weft release position and to move to the weft pullback position after completion of the operation. The moving amount and moving speed of the movable member in the weft releasing operation and the weft retracting operation while the loom is stopped are performed in the same state as the operation during the weaving operation.

JP 2001-20156 A

  The weft yarn in the weft insertion nozzle while the loom is stopped is in a free state because it is not subjected to a large tension by the jet fluid as in the weaving operation. For this reason, for example, in a loom that performs weft insertion by air injection, a slight wind is applied from the weft insertion nozzle to give a slight tension to the weft yarn after the weft insertion ends and during the loom stop so that the weft yarn does not fall out of the weft insertion nozzle. Measures are taken. Further, in a loom that performs weft insertion by water injection, it is devised so that a slight tension is applied to the weft by adhesion with water droplets remaining in the weft insertion nozzle so that the weft does not come out of the weft insertion nozzle. However, in any case, the weft in the weft insertion nozzle when the loom is stopped is very unstable as compared with the weaving operation.

  Therefore, when the weft pulling device is operated to perform the predetermined work while the loom is stopped, problems do not easily occur in the weft releasing operation. However, when the weft pulling back operation is performed after the predetermined work is completed, the movable member moves at a high speed in the same way as during the weaving operation, so that the weft is momentarily subjected to a large force and pulled out from the weft insertion nozzle and falls off. The problem arises. For example, if weaving operation is performed at 800 rpm which is a general operation operation speed of a loom, the movement of the movable member is very high considering that the weft pulling device must finish the operation within about 10 ms. It turns out that it is.

  An object of the present invention is to pull back so that the weft thread does not come out of the weft insertion nozzle while the fluid jet loom is stopped.

  According to a first aspect of the present invention, there is provided a weft storage device for temporarily storing a weft drawn from a yarn feeder, a weft insertion nozzle for weft insertion into a warp opening, and the weft storage device and the weft insertion nozzle. A fluid jet loom having a weft pullback device disposed between and displaceable between a weft pullback position and a weft release position, wherein the movable member of the weft pullback device is driven by a variable speed motor; While the fluid jet loom is stopped, at least the movable member that is displaced toward the weft pullback position is moved at a speed lower than the moving speed during the weaving operation.

  According to the first aspect of the present invention, the displacement of the movable member of the weft pullback device toward the weft pullback position is stopped at a low speed (a speed lower than the moving speed during the weaving operation) while the fluid jet loom is stopped. It is possible to prevent the weft from coming out of the weft insertion nozzle, and it is possible to restart in a state where the weft is pulled back to the normal position.

  The present invention according to claim 2 is characterized in that the low-speed movement of the movable member is performed at a speed corresponding to the weft tension in the weft insertion nozzle while the fluid jet loom is stopped. Since the moving speed of the member is set corresponding to the relatively low weft tension during stoppage, weft removal from the weft insertion nozzle can be reliably prevented.

  According to a third aspect of the present invention, a high-speed drive mode and a low-speed drive mode are set in a control device that gives a drive command to the weft pullback device, and a low-speed drive mode is set based on a stop signal of the fluid jet loom. Since it is only switched to a preset low-speed drive mode, the configuration for driving the movable member at a low speed is simple.

  The invention according to claim 4 is characterized in that a command for displacing the movable member to the weft retracting position is transmitted from the control device in response to a restart signal of the fluid jet loom. Even if there is a case where the member is not displaced to the weft pullback position, the weft can be reliably displaced to the weft pullback position when the loom is restarted.

  The present invention according to claim 5 is characterized in that the movable member is driven by a stepping motor, so that the drive system of the weft retracting device can be made simple and inexpensive.

  According to the present invention, the weft pulling back operation while the fluid jet loom is stopped can be accurately performed without causing the weft to come off from the weft insertion nozzle.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is applied to an air jet loom for two-color weft insertion (hereinafter simply referred to as a loom) will be described with reference to FIGS. In addition, terms such as two-color weft insertion or multi-color weft insertion described in the specification of the present application refer to a case where wefts are appropriately selected from a plurality of different color yarn feeding bobbins, and a case where a plurality of same color yarn feeding bobbins are provided. This includes the case where wefts are alternately inserted.

  In FIG. 1, the weft Y1 or Y2 drawn from the yarn feeding bobbin 1 or 2 is wound around the drum 7 or 8 by the yarn winding tube 5 or 6 of the weft storage device 3 or 4, and the electromagnetic locking pin 9. Alternatively, a certain amount is stored by engagement with 10. The weft releasing operation of the locking pin 9 or 10 is performed at the weft insertion start timing programmed in the control device (not shown), and the weft locking operation of the locking pin 9 or 10 is performed on the weft Y1 or Y2 on the drum 7 or 8. This is performed based on a signal from the photoelectric sensor 11 or 12 that detects consumption. The weft locking operation of the locking pin 9 or 10 based on the signal of the photoelectric sensor 11 or 12 is performed at the weft insertion end timing.

  The weft Y1 or Y2 on the drum 7 or 8 is drawn out by the tandem nozzle 13 or 14, respectively, and is inserted into the opening of the upper and lower warps T by the weft insertion nozzle 15 or 16. During the weaving operation, either the weft yarn Y1 or Y2 of the yarn feeding bobbin 1 or 2 is selected or alternately inserted according to the weft insertion program.

  A plurality of auxiliary nozzles 18 are arranged on the sley 17 along the weft path X indicated by a one-dot chain line, and the wefts Y1 or Y2 are inserted while being assisted by the air injection from the auxiliary nozzles 18. The weft path X is formed in a weft guide hole 20 of a reed 19 called a so-called deformed reed arranged in parallel in the weft insertion direction on the sley 17. When the weft insertion is completed, the weft Y1 or Y2 is beaten by the scissors 19 and then cut by the cutter 21 provided outside the weave end on the weft insertion side of the woven fabric W.

  On the other hand, as shown in FIGS. 1 and 2, weft pullback devices 22 and 23 are disposed in the paths of the wefts Y1 and Y2 upstream of the tandem nozzles 13 and 14, respectively. FIG. 2 representatively shows a weft insertion mechanism from the yarn feeding bobbin 1 to the weft insertion nozzle 15. The weft pullback device 22 is configured as follows.

  Two weft guides 24 and 25 are arranged on the upstream side of the yarn introduction hole 13a of the tandem nozzle 13 at a predetermined interval. A stepping motor 26 configured as a variable speed motor of the present invention has a movable member 29 formed of a U-shaped linear body or a rod-shaped body on a holder 28 fixed on a drive shaft 27 thereof. The U-shaped portion of the movable member 29 is located in the space between the yarn introduction hole 13a and the weft guide 24 and the space between the weft guides 24 and 25, and is disposed above the weft Y1 (see FIG. 3). Yes.

  The stepping motor 26 is connected to a power source (not shown) through a driver 30 and is connected to the control device 31 through a signal line. The control device 31 commands the driver 30 to determine the rotation speed of the stepping motor 26 at the operation timing of the weft pullback device 22. The driver 30 can drive the stepping motor 26 at a pulse rate corresponding to the command signal from the control device 31. The control device 31 is set with a high speed drive mode for instructing the stepping motor 26 to perform high speed rotation and a low speed drive mode for instructing low speed rotation lower than the high speed drive mode.

  The high speed drive mode is used for the operation of the weft pullback device 22 in the weaving operation of the loom, and the low speed drive mode is used for the operation of the weft pullback device 22 while the loom is stopped. Accordingly, the driver 30 changes the pulse rate according to the rotational speed command in the high speed driving mode or the rotational speed command in the low speed driving mode from the control device 31 and drives the stepping motor 26. The number of rotations in the low-speed drive mode is set according to the weft tension applied by the light wind blown from the weft insertion nozzle while the loom is stopped. As the rotation speed in the low-speed drive mode, for example, a rotation speed about 1/10 of the rotation speed in the high-speed drive mode is set. Therefore, when the stepping motor 26 is rotated in the low-speed drive mode, the moving speed of the movable member 29 is very low compared to that during the weaving operation, and the weft Y1 can be pulled back slowly. The rotational speed in the low-speed drive mode may be changed according to the tension of the weft Y1 measured directly or indirectly, and the weft Y1 is pulled out even at the assumed minimum tension. It may be set to the minimum number of revolutions.

  The movable member 29 is displaced to the weft retracting position 29a, the weft braking position 29b, the weft releasing position 29c, and the origin position 29d shown in FIG. 3 based on the rotation speed of the stepping motor 26, that is, the rotation speed command from the control device 31. Can do. The weft pull-back position 29a is a position where the movable member 29 is further rotated downward from the weft braking position 29b at the loom rotation angle θ10 after the weft insertion end (the loom rotation angle θ9, hereinafter refer to FIG. 4). Y1 is bent to the maximum, and the weft end protruding toward the downstream side of the weft insertion nozzle 15 is pulled back.

  The weft braking position 29b is a position where the movable member 29 is rotated downward from the weft opening position 29c to bend a certain amount of the weft Y1 at the weaving machine rotation angle θ8 during weft insertion, and the weft Y1 flying before the weft insertion is finished. To reduce the occurrence of excessive tension due to impact at the end of weft insertion. The weft release position 29c is a position in which the movable member 29 is rotated above the weft path 29a from the weft retracting position 29a at the weaving machine rotation angle θ2 before the weft insertion start (weaving machine rotation angle θ5). Therefore, wetting resistance is reduced so that weft insertion can be performed smoothly. The origin position 29d is a position where the movable member 29 rotates upward to the maximum and comes into contact with the stopper 32. When the stepping motor 26 is first energized, the origin of a resolver (not shown) built in the stepping motor 26 is adjusted. Do. Reference numeral 33 denotes a rotary encoder that detects a loom rotation angle and inputs it to the control device 31. Since the weft pullback device 23 has the same structure as the weft pullback device 22 and performs the same operation, detailed description thereof is omitted.

  The loom rotation angles θ1 to θ10 shown in FIG. 4 will be described in detail below, though partially overlapping with the above description. FIG. 4 shows the two-color weft insertion of the weft Y1 by the weft insertion nozzle 15 and the weft Y2 by the weft insertion nozzle 16, and the first rotation (0 ° to 0 °) of the drawing shows the weft insertion of the weft Y1. The second rotation shows the weft insertion of the weft Y2. θ1 is the weft cutting timing by the cutter 21. θ2 represents the weft release timing of the weft pullback devices 22 and 23, θ8 represents the weft braking timing, and θ10 represents the weft pullback timing. θ3 represents the air injection timing of the weft insertion nozzles 15 and 16, and θ7 represents the air injection end timing. θ4 represents the air injection timing of the tandem nozzles 13 and 14, and θ6 represents the air injection end timing. θ5 is a weft insertion start timing, and θ9 is a weft insertion end timing.

The operation of the first embodiment configured as described above will be described below.
Since the operations such as weft insertion and weft pullback of the weft Y1 and the weft Y2 are the same, the case of the weft Y1 will be described as a representative in FIG. During the weaving operation, after one rotation of the loom starts, the movable member 29 of the weft pullback device 22 is in the weft pullback position 29a. In response to the rotational speed command in the high speed drive mode from the control device 31, the movable member 29 is displaced to the weft release position 29c at the loom rotation angle θ2, and the bent state of the weft Y1 is canceled.

  At the loom rotation angle θ3, the injection of air fluid by the weft insertion nozzle 15 is started, and after a slight delay, the injection of air fluid by the tandem nozzle 13 is started at the loom rotation angle θ4. Subsequently, at the loom rotation angle θ5, the locking pin 9 releases the weft Y1 and the weft insertion is started. The weft Y1 is injected into the warp opening by the weft insertion nozzle 15 and is inserted along the weft path X by relay injection from the auxiliary nozzles 18. After weft insertion, the tandem nozzle 13 finishes air injection at the loom rotation angle θ6 and the weft insertion nozzle 15 ends at the loom rotation angle θ7, respectively, but the weft Y1 continues to fly by air injection from the auxiliary nozzle 18. To do.

  When the weaving machine rotation angle θ8 during weft insertion is reached, a rotation speed command based on the high-speed drive mode is transmitted from the control device 31 to the driver 30, and the stepping motor 26 of the weft pulling-back device 22 is rotated at high speed. Accordingly, the movable member 29 is displaced from the weft release position 29c to the weft braking position 29b at a high speed, bends the flying weft Y1 by a certain amount, and brakes the weft Y1. At the loom rotation angle θ9, the locking pin 9 protrudes on the drum 7, and the weft insertion is completed by locking the weft Y1 that decelerates and flies.

  Thereafter, the stepping motor 26 is rotated at a high speed by a rotational speed command based on the high speed drive mode from the control device 31 at the loom rotation angle θ10, and the movable member 29 is displaced at high speed from the weft braking position 29b to the weft retracting position 29a. To the maximum bending state. For this reason, a predetermined tensile tension is applied to the weft Y1 that is gripped by the warp T that is closed, and an appropriate tension state is maintained. Thereafter, the weft Y1 is beaten by the kite 19 at a loom rotation angle of about 0 °.

  The weft Y1 enters the second rotation of the loom while maintaining the retracted state by the weft pullback device 22, and is cut by the cutter 21 at the loom rotation angle θ1. In the second rotation of the loom, the weft Y1 is in a standby state and the weft Y2 is inserted, so that the weft retractor 22 keeps the movable member 29 at the weft retracting position 29a and continues the retracted state of the weft Y1.

  Next, the operation of the weft pullback device 22 while the loom is stopped will be described with reference to FIG. 5 exemplifying a case where an automatic defective weft removal operation is performed, for example. If a weft insertion failure of the weft Y1 occurs during the weaving operation, the loom is stopped in a state where cutting of the defective weft Y1 by the cutter 21 and subsequent weft insertion are prevented. The control device 31 switches the high-speed drive mode of the weft pullback device 22 during the weaving operation to the preset low-speed drive mode of the weft pullback device 22 during the stop based on the stop signal of the loom. The loom reverses to 180 ° of the weft insertion timing at which the last weft insertion was performed in order to remove the defective weft, and then stops. After the stop, the control device 31 transmits a rotation speed command in the low speed drive mode to the driver 30. The driver 30 drives the stepping motor 26 while changing to a pulse rate corresponding to a low-speed rotational speed command. Accordingly, the movable member 29 is displaced from the weft pullback position 29a to the weft release position 29c at a low speed, and the bent state of the weft Y is canceled. The displacement of the movable member 29 from the weft pullback position 29a to the weft release position 29c is performed at a pulse rate corresponding to a high speed command during the weaving operation, not a pulse rate corresponding to a low speed command. May be.

  Subsequently, air is injected from the weft insertion nozzle 15 and the tandem nozzle 13 and the engagement pin 9 is operated to release the engagement state of the weft Y1 on the drum 7. The weft Y1 ejected from the weft insertion nozzle 15 is introduced into the defective weft removal device and removed together with the weft Y1 that has generated the weft insertion failure. When the removal of the defective weft Y1 is completed, the weft Y1 on the drum 7 is locked by the locking pin 9, and the weft Y1 between the weft insertion nozzle 15 and the defective weft removing device is cut, and the defective weft removing operation is performed. finish.

  Upon completion of the defective weft removal operation, the control device 31 transmits a rotational speed command based on the low speed drive mode to the driver 30, so that the stepping motor 26 rotates at a low speed, and the movable member 29 moves from the weft release position 29c to the weft pullback position 29a. The weft Y1 that is displaced at a low speed and protrudes from the weft insertion nozzle 15 is accurately pulled back in a stable state. The movable member 29 is maintained at the weft pullback position 29a to prepare for the restart of the loom.

  Note that there are cases where the movable member 29 is not returned to the weft retracting position 29a even if the weft retracting device 22 is operated while the loom is stopped and the predetermined operation is completed. In order to solve such a problem, the control device 31 is set so that a return command to the weft pullback position 29a in the low speed drive mode is transmitted by the restart signal of the loom. Accordingly, the weft pullback device 22 is operated so that the movable member 29 is always present at the weft pullback position 29a when the loom is restarted.

In the first embodiment of the present invention described above, the following operational effects are obtained.
(1) When the weaving machine is stopped, the weft pullback devices 22 and 23 operate at a low speed corresponding to the low tension state of the wefts Y1 and Y2 held by the weft insertion nozzles 15 and 16 (more than the moving speed during the weaving operation). Therefore, there is no possibility that the wefts Y1 and Y2 will come off from the weft insertion nozzles 15 and 16.
(2) Since the operation of the weft pullback devices 22 and 23 while the loom is stopped only switches between the high-speed drive mode during the weaving operation and the low-speed drive mode during the stop, the configuration is simple.
(3) Since the mechanisms of the weft pullback devices 22 and 23 that have been used in the past can be used as they are, the cost does not increase.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications are possible within the scope of the gist of the present invention, and can be implemented as follows.

(1) The variable speed motor constituted by the stepping motor 26 may be constituted by a servo motor.
(2) In the first embodiment, the movable member 29 of the weft pullback device 22 is set to be displaced to the pullback position 29a based on the stop signal of the loom, but it may be set to stop at another position. good. In this case, the movable member 29 may be displaced to the pull-back position 29a by a restart signal from the loom.
(3) A tension sensor for detecting the propulsive force in the weft insertion direction of the wefts Y1 and Y2 held by the weft insertion nozzles 15 and 16 when the loom is stopped is provided. The number of rotations at can be calculated. By such feedback control, weft pullback most suitable for the stopped wefts Y1 and Y2 can be performed.
(4) The present invention can be implemented in a multi-color fluid jet loom equipped with yarn feeding bobbins of three or more colors.
(5) The present invention can be implemented not only in an air jet loom but also in a fluid jet loom such as a water jet loom.

It is a schematic plan view of the fluid injection type loom for two colors. It is a top view which shows a weft pullback apparatus. It is a partial cross section side view of a weft pullback apparatus. It is a timing chart which shows the weft pull-back operation during the weaving operation. It is explanatory drawing of the weft pulling-back operation | movement in the loom stop.

Explanation of symbols

1, 2 Yarn supply bobbin 3, 4 Weft storage device 13, 14 Tandem nozzle 13a Yarn introduction hole 15, 16 Weft insertion nozzle 22, 23 Weft draw back device 24, 25 Weft guide 26 Stepping motor 29 Movable member 29a Weft draw back position 29b Weft Braking position 29c Weft release position 29d Origin position 30 Driver 31 Control device 32 Stopper 33 Rotary encoder

Claims (5)

A weft storage device for temporarily storing the weft drawn from the yarn feeder, a weft insertion nozzle for weft insertion into the warp opening, and a weft retracting position disposed between the weft storage device and the weft insertion nozzle And a fluid jet loom equipped with a weft pulling back device having a movable member displaceable between the weft opening position and the weft opening position,
The movable member of the weft retracting device is driven by a variable speed motor, and the movable member that is displaced at least toward the weft retracting position is moved at a speed lower than the moving speed during the weaving operation while the fluid jet loom is stopped. A method of operating a weft pullback device in a fluid jet loom characterized by comprising:   The weft pull-back in the fluid-jet loom according to claim 1, wherein the low-speed movement of the movable member is performed at a speed corresponding to the weft tension in the weft insertion nozzle while the fluid-jet loom is stopped. How to operate the device.   2. A high-speed drive mode and a low-speed drive mode are set in a control device that gives a drive command to the weft pullback device, and the low-speed drive mode is switched based on a stop signal of the fluid jet loom. Or the operation method of the weft pulling-back apparatus in the fluid-jet type loom of Claim 2.   The operation method of the weft pullback device in the fluid jet loom according to claim 3, wherein a command for displacing the movable member to a weft pullback position is transmitted from the control device in response to a restart signal of the fluid jet loom. .   The method of operating a weft pullback device in a fluid jet loom according to any one of claims 1 to 4, wherein the movable member is driven by a stepping motor.

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