JP3757575B2 - Loom weft insertion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a weft insertion device for a loom that performs weft insertion by switching between pulling and non-traction of a weft by a roller pulling device provided between a length measuring storage device and a posture control nozzle by a switching device.
[0002]
[Prior art]
As a weft insertion device for a loom, a device is known in which wefts wound around a drum of a length measuring storage device are drawn out by a jet fluid from a nozzle and run into a warp opening. In this apparatus, since weft insertion can be performed at high speed with a fluid, an extremely excellent effect is achieved in terms of improvement in productivity. However, when the weft is pulled as a fluid, for example, by air injection, the weft is pulled by the friction between the air and the weft. Therefore, the amount of air consumption is large, and there remains a problem to be solved in terms of energy consumption. .
[0003]
Therefore, as disclosed in, for example, Japanese Patent Laid-Open No. 7-18541, a roller traction device is provided that directly pulls a weft thread between a pair of constantly rotating rollers between a length measuring storage device and a nozzle, and is switched. By switching the traverse lever having a weft guide as a device, traction or non-traction by the roller traction device is switched, so that the nozzle (posture control nozzle) is inserted into the warp opening while maintaining the posture of the weft. As a result, energy consumption can be reduced.
[0004]
[Problems to be solved by the invention]
In the conventional weft insertion device as described above, when weaving using a strong twisted yarn or the like, the weft slack generated at the initial stage of pulling by the roller is entangled as a hairpin, and is woven into the fabric in a tangled state as it is. There is a need for an apparatus that cannot be applied because it may be a drawback, and that can be applied to such yarn types. Hereinafter, the reason will be described with reference to the drawings.
The above-mentioned known document shows a case where it is applied to a multi-color loom (2 nozzles), but even with one nozzle, the function of the roller pulling device does not change, so in this conventional example, an example with one nozzle is shown. explain.
[0005]
FIG. 11A shows a state immediately after the start of weft insertion when injection for weft insertion of the attitude control nozzle 100 has started, the traction speed by the attitude control nozzle 100 has not increased so much, and the traverse lever 101 is in the non-traction position. Has stopped. As a result, the weft Y passes from the yarn guide 102 through the weft guide 101a of the traverse lever 101 and passes through the vicinity of the pair of rollers 103a and 103b of the roller pulling device 103 so as not to interfere with each other. It is located at a position P1 on the flat upper surface of the part 104, and further takes a yarn path pulled by the attitude control nozzle 100 via the weft guide 105.
[0006]
FIG. 11B shows the state immediately after the traverse lever 101 starts moving from the non-traction position to the traction position, and at this time, the traction speed by the attitude control nozzle 100 is lower than the traction speed by the roller traction device 103. . When the traverse lever 101 starts to move, the weft Y slides on the flat upper surface of the guide edge 104 inward from the position P1 and moves to the position P2, and a part of the weft Y is a pair of rollers 103a, It is the moment when it is bitten by the end between the contact surfaces of 103b.
[0007]
FIG. 11 c shows a state in which the traverse lever 101 is further moved from the non-traction position to the traction position side, and the weft Y caught in the end portion between the contact surfaces of the pair of rollers 103 a and 103 b is It is discharged downstream by the pulling speed (circumferential speed of the rollers 103a and 103b) by the roller pulling device 103 that is faster than the pulling speed by the attitude control nozzle 100. In this case, the weft Y sent out from the roller pulling device 103 at a high speed overtakes the weft Y pulled by the attitude control nozzle 100, and a new yarn path is generated. At this time, the weft Y on the roller pulling device 103 side and the weft Y on the posture control nozzle 100 side are approaching in the direction along the roller axis L. For this reason, a hairpin grub-like bent portion D that is bent sharply is formed between the weft Y on the roller pulling device 103 side and the weft Y on the posture control nozzle 100 side.
[0008]
FIG. 12a is a diagram subsequent to FIG. 11c, in which the traverse lever 101 has stopped moving to the pulling position, the weft passing phenomenon continues, and the hairpin grub-shaped bent portion D rises while growing. And then rise to the air.
[0009]
FIG. 12b shows a state in which the traverse lever 101 remains stopped at the pulling position, and the grown hairpin curved bent portion D floats in the air. The weft Y is entangled inside the bent portion D.
[0010]
In FIG. 12c, the bending portion gradually decreases as the pulling speed by the attitude control nozzle 100 increases. However, when the entanglement is strong, the bending portion D does not disappear, and the bending portion D remains as it is. A weaving defect is caused by being inserted from the attitude control nozzle 100 via 105.
[0011]
For this reason, although not shown in the drawings, in the above-mentioned known materials, a funnel-shaped slack deforming member is provided on the downstream side of the roller pulling device, and the weft Y is brought into contact with the funnel-shaped slack deforming member. In the case of a strong twisted yarn, etc., even if the weft yarn once entangled with the funnel-shaped member may not be deformed into a gentle shape, in that case It cannot be denied that wefts are inserted while the wefts are entangled, resulting in a woven defect as described above.
[0012]
Accordingly, the present invention is to provide a weft insertion device for a loom that can prevent entanglement at the curved portion of the weft formed at the initial stage of roller pulling, in which the pulling speed by the roller pulling device is faster than the pulling speed by the attitude control nozzle. To do.
[0013]
[Means for Solving the Problems]
A weft insertion device for a loom according to the present invention includes a length measuring storage device, a roller pulling device that pulls a weft thread from the length measuring storage device, and a weft pulling position and a non-pulling position by a roller of the roller pulling device. And a weft insertion device for a loom having a posture control nozzle for performing weft insertion by causing a weft thread pulled by operation of the switching device to fly into a warp opening by fluid injection. There is a holding means to temporarily store the weft yarn at a position away from the roller side at the beginning of , Keep The holding means includes a weft guide that is located between the roller pulling device and the attitude control nozzle and extends substantially along the axial direction of the roller of the roller pulling device. The weft guide moves the weft downward at least when the pulling by the roller is finished. An upper guide to be guided and a position extending from the upper guide to the position separated from the roller side, and the weft is guided away from the roller side until immediately after the start of pulling the roller for the next weft insertion. It is characterized by having a step to hold . Steps The difference part was formed as an inclined surface extending downward The The inclined surface is formed so as to extend in the direction crossing back and forth with respect to the roller axis of the roller traction device. May be .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
First embodiment
1 to 7 show the first embodiment. First, the overall structure and operation of the weft insertion device for a loom will be described with reference to FIGS. 6 and 7, and then FIGS. The structure and operation of the important part will be described.
[0015]
FIG. 6 schematically shows the structure of a weft insertion device for a loom. In FIG. 6, in this embodiment, the wefts Y from the plurality of yarn feeders 1 are controlled like the A side weft Y and the B side weft Y, for example, ABB, ABB or AAB, AAB. A weft insertion device that performs multicolor weaving such as one-pass weaving or two-pass weaving based on a predetermined color designation or weft insertion order in the device 120 is illustrated as an example. Therefore, the following description will be mainly focused on the weft insertion of the A-side weft Y.
[0016]
The weft Y is drawn from the yarn feeder 1 to the attitude control nozzle 71 via the length measuring storage device 10, the yarn guide 18, the switching device 50, the roller pulling device 30, and the slack deformation means 20. Then, when the operator presses the preparation button 121a, the loom main body control device 121 of the control device 120 outputs a loom start preparation signal (start command) to instruct the start of the inverter 124 and instruct to start the operation of the timer 121d. To do.
[0017]
In parallel with this, the length measuring storage device 10 is attached to the inside of the main body 12 with the winding arm 13 rotatably supported inside the main body 12 by the start command from the loom main body control device 121. , And a portion of the weft Y is locked to the locking claw 14 inserted on the outer periphery of the drum 11, and the weft Y passing through the winding arm 13 is rotated to rotate the drum 11. Wound around and stored.
[0018]
Next, when the motor 31 of the roller traction device 30 reaches the optimum rotational speed for weft insertion via the inverter 124 according to the start command to the inverter 124, the loom main body controller 121 outputs a signal indicating that the loom starts. Then, the loom start preparation completion is displayed on the display unit not shown. When the operator who sees the indication that the loom is ready to start, presses the start button 121b, the loom main body controller 121 starts the loom main motor 7.
[0019]
That is, when the operator presses the start button 121b after the preparation for starting the loom, the loom main body controller 121 inputs a start signal to the driver 7a via the timer 121d, so that the driver 7a starts the loom main motor 7. . Simultaneously with the start of the loom main motor 7, the loom main body control device 121 inputs a loom operation signal to the weft selection command device 122 and the actuator drive command generation device 123. The preparation button 121 a, the loom main body control device 121, and the timer 121 d constitute roller advance driving means of the roller pulling device 30. In addition, the timer 121d constitutes a starting temporary prevention means. The weft selection command device 122 detects the rotation angle of the loom main shaft 5 driven by the loom main motor 7 in accordance with a pre-programmed color designation or weft insertion sequence when weaving multicolor weaving such as Ichikoshi or Nikoshi weaving. Based on the loom angle signal from the angle sensor 6, the actuator drive command generator 123 is instructed to select a weft Y for instructing the weft Y to be used for the next weft insertion.
[0020]
For example, when the weft selection commanding device 122 instructs the actuator drive command generating device 123 to select a weft selection command indicating that the next weft insertion is, for example, the A-side weft Y, the A-side command is the main shaft angle. Has been output in advance from about 300 degrees of the weft insertion cycle. The preceding output is for preventing a weft insertion failure from occurring due to a response delay from when the weft selection command is selected until various actuators operate. Subsequently, when the main shaft angle reaches 300 degrees, a weft selection command indicating, for example, the B-side weft Y is output as the weft Y in the next weft insertion cycle.
[0021]
The actuator drive command generator 123 operates each actuator via the drivers 15a, 15b, 51a, 51b, 77a, 77b, 82a in accordance with the loom angle signal from the angle sensor 6. For each actuator, A side locking claw operation corresponding to the driver 15a, B side locking claw operation corresponding to the driver 15b, A side traverse lever operation corresponding to the driver 51a, and driver 51b B side traverse lever operation, corresponding to driver 77a is for A side posture control nozzle injection operation, driver 77b is for B side posture control nozzle injection operation, cutter device operation corresponding to driver 82a Etc.
[0022]
That is, the driver 15a supplies and cuts off electric power to the electromagnetically driven self-returning type weft insertion solenoid 15 corresponding to the locking claw 14 on the A side. The driver 15b supplies power to and shuts off the electromagnetically driven self-returning weft insertion solenoid 15 corresponding to the locking claw 14 on the B side. By supplying power to and shutting off the weft insertion solenoid 15, the locking claw 14 is inserted into the drum 11 to lock the weft Y, or the locking claw 14 comes out of the drum 11 and unwinds the weft Y.
[0023]
The driver 51a supplies and cuts off electric power to the electromagnetically driven self-return type switching solenoid 51 corresponding to the A-side traverse lever 52. The driver 51b supplies and cuts off electric power to the electromagnetically driven self-return type switching solenoid 51 corresponding to the B-side traverse lever 52. The traverse lever 52 switches between the traction and non-traction of the weft Y with respect to the roller traction device 30 by supplying and cutting off power to the switching solenoid 51.
[0024]
The driver 77a supplies power to and shuts off the on-off valve 77 of the A-side attitude control nozzle 71. The driver 77b supplies power to and shuts off the on-off valve 77 of the B-side attitude control nozzle 71. When the on-off valve 77 is opened by supplying and shutting off power to these on-off valves 77, the main pressure tank 76 connected to the pressurized air supply source 74 through the pressure reducing valve 75 adds pressure for weft insertion. When pressurized air is injected from the attitude control nozzle 71 via the on-off valve 77 and the on-off valve 71 is closed, the air injection from the attitude control nozzle 71 is stopped.
[0025]
The driver 82a supplies and interrupts power to the rotary solenoid 82 of the cutter device 80 provided on the weaving side on the weft insertion side. When the rotary solenoid 82 is operated by electric power, the weft Y on which the cutter 81 is beaten is cut.
[0026]
Although not shown in the air supply path of the plurality of sub-nozzle groups 72 for weft insertion arranged on the front side of the eaves 3, relief valves are provided from the pressurized air supply source 74 side to the plurality of sub-nozzle groups 72. And a plurality of electromagnetically driven self-returning on-off valves corresponding to the sub-nozzle group 72 are provided in order. The plurality of on-off valves in the air supply path of the sub-nozzle group 72 are sequentially opened from the weft insertion side to the counter weft insertion side with a predetermined opening / closing period by an output signal from the loom main body controller 121. By opening and closing the plurality of on-off valves, the sub nozzle group 72 relays the pressurized air so as to follow the flying tip of the weft Y, and from the weft insertion side of the pressurized air from the sub nozzle group 72 to the counter weft insertion side As a result, the weft Y travels through the warp opening through an air guide (not shown) formed on the heel 3.
[0027]
Further, a weft arrival sensor 110 as a detecting means for detecting the arrival timing of the weft Y inserted therein is provided on the side opposite to the weft insertion side of the warp row (not shown). The output signal of the weft arrival sensor 110 and the output signal of the angle sensor 6 are input to the loom main body controller 121. The loom main body controller 121 replaces the output signal input time of the weft arrival sensor 110 with the rotational angle position from the angle sensor 6, and the detected arrival timing consisting of the replaced rotational angle position and the loom main body controller as a reference value in advance. The difference from the set arrival timing set in 121 is calculated, the difference is corrected to the swing timing (traverse timing) of the traverse lever 52 in the switching device 50, and the corrected swing timing, which is this correction command, is used for the loom operation. The traverse lever 52 is fed back to the set swing timing of the traverse lever 52 determined by the loom rotational speed and the weaving width input from the operator in the preparatory work, and the power supply time from the power source (not shown) to the switching solenoid 51 is controlled. Control the stop time at 52 towing positions. The loom main body control device 121 stops the operation of the loom when the operator presses the stop button 121c when stopping the loom. The stop button 121c can be pressed as needed.
[0028]
FIG. 7 is a timing chart in the case where the loom is in steady operation, in which the horizontal axis indicates the rotation angle of the loom main shaft 5 and the vertical axis indicates the operation content. Although FIG. 7 shows a one-ply weave in which weft Y on the A side and weft Y on the B side are alternately inserted, the operation of each actuator is basically the same on the A side and B side. Only the operation of each actuator will be described.
[0029]
The loom start preparation signal is output when the preparation button 121a is pressed, and is turned on during the loom operation. The loom operation signal is output when the start button 121b is pressed, and is turned on during the loom operation. The roller rotation command signal is output when the preparation button 121a is pressed, and is turned on during the loom operation. When the roller rotation command signal is turned on, the motor 31 of the roller pulling device 30 is driven to rotate.
[0030]
The loom start permission signal is off when the loom start is blocked, that is, when the timer 121d is in operation, turned on when the timer 121d stops operating, that is, when preparation for starting is complete, and is on when the loom is running.
[0031]
The locking claw 14 performs a weft locking operation when the signal is turned off and a weft unwinding operation when the signal is turned on.
[0032]
The attitude control nozzle 71 is in a state where jetting for weft insertion is performed when the signal is turned on, and only jetting is performed by turning off the signal and injection for weft insertion is stopped.
[0033]
The cutter 81 of the weft insertion side cutter device 80 becomes a cutting operation L (cutter blade closing) when the signal is turned on, and a non-cutting operation (cutter blade opening) when the signal is turned off.
[0034]
The traverse lever 52 moves from the non-traction position to the traction position side when the signal is turned on, and moves from the traction position to the non-traction position side when the signal is turned off.
[0035]
When the rotation angle of the loom main shaft 5 reaches a position just before the left end of the left end in FIG. 7, the leading end of the weft Y reaches the opposite weft insertion side. Reference numeral 14 denotes a state in which the weft Y is locked, and the attitude control nozzle 71 does not perform injection for weft insertion but only a slight wind injection. The motor 31 of the roller traction device 30 is always rotating, but the traverse lever 52 is in a non-traction state.
[0036]
Next, immediately after the rotation angle of the loom main shaft 5 exceeds 0 degrees and the beating is finished, the cutter device 80 operates to cut the weft Y. Then, when the rotation angle of the loom main shaft 5 reaches 60 degrees, the posture control nozzle 71 starts jetting for weft insertion, but the weft Y does not fly because the locking claw 14 locks the weft Y. . Subsequently, when the locking claw 14 releases the weft Y, the weft Y starts to fly, and the sub-nozzle group 72 on the weft insertion side starts jetting, the traverse lever 52 swings to the traction position side almost simultaneously. As a result, the weft Y is pulled by the roller pulling device 30. Therefore, the weft Y flies to the opposite weft insertion side by the roller pulling by the roller pulling device 30 and the fluid pulling by the attitude control nozzle 71.
[0037]
Subsequently, the weft Y is sent to the opposite weft insertion side while the posture is controlled by the relay injection of the posture control nozzle 71 and the sub nozzle group 72. When the unwinding sensor (not shown) provided in the vicinity of the locking claw 14 detects a predetermined number of unwinding turns, the locking claw 14 immediately enters the locking position. After approximately one turn after the locking claw 14 enters the locking position, the weft Y is locked to the locking claw 14 and the weft insertion is completed. Further, the arrival of the weft Y inserted is detected by the weft arrival sensor 110, and the weft arrival sensor 100 outputs a weft arrival signal to the loom main body control device 121.
[0038]
FIG. 1 shows the external appearance of the yarn guide 18, the switching device 50, the roller pulling device 30, the holding means 60, the slack deformation means 20, and the attitude control nozzle 71. In FIG. 1, the yarn guide 18, the switching device 50, the roller pulling device 30, the holding means 60, and the slack deformation means 20 are provided on a fixed base 46 provided so as to protrude outward from the side frame 45 of the loom. It is provided in order from the upstream side in the insertion direction to the downstream side. The yarn guide 18 guides the weft Y toward a predetermined position on the downstream side, and is attached to the front wall 46 a of the fixed base 46. The front wall 46 a is a separate body from the fixed base 46 and constitutes a base in which the switching device 50 and the yarn guide 18 are assembled. However, the front wall 46 a may be formed in the same body as the fixed base 46.
[0039]
The switching solenoid 51 of the switching device 50 drives the output shaft to rotate in one direction by energizing electromagnetic force due to power supply, and returns the output shaft to reverse rotation by the spring force of the elastic body accompanying the deactivation of electromagnetic force due to power interruption. It is formed as an electromagnetically driven self-returning type rotary solenoid, and is attached to the front wall 46 a of the fixed base 46 below the yarn guide 18. As this switching solenoid, a type using an electromagnetic force on the return side may be used. A traverse lever 52 is fixedly attached to the output shaft of the switching solenoid 51. The traverse lever 52 has a weft guide 53 through which the weft Y passes through a tip portion protruding upward from the front wall 46a on the downstream side of the front wall 46a of the fixed base 46 in the weft insertion direction.
[0040]
The switching device 50 switches between the traction and non-traction of the weft Y with respect to the roller traction device 30 by the swinging motion of the traverse lever 52. For example, in relation to the pulling operation of the attitude control nozzle 71 accompanying the weft insertion cycle of the weft Y, the traverse lever 52 moves from the position indicated by the solid line to the position indicated by the dotted line, whereby the non-traction yarn path as the displacement path indicated by the solid line The weft Y existing in Y2 is pulled between the driving side roller 33 and the driven side roller 35 of the roller pulling device 30 to be pulled.
[0041]
On the contrary, when the traverse lever 52 moves from the dotted line position to the solid line position, the weft Y existing in the traction line Y1 as the flying path indicated by the alternate long and short dash line is moved between the driving roller 33 and the driven roller 35. It is pulled out from the space and becomes non-traction state.
[0042]
Further, when a weft insertion failure or the like occurs and a stop signal is issued, the switching solenoid 51 self-resets so that the traverse lever 52 separates the weft Y from the driving roller 33 and the driven roller 35. The traverse lever 52 is held at the non-traction position indicated by the solid line. Thereby, weft breakage when the machine is stopped can be prevented, and weft insertion can be performed easily.
[0043]
The driving roller 33 of the roller pulling device 30 is fixedly attached to the output shaft of the motor 31 attached to the side wall 46c of the fixed base 46. The driving roller 33 is formed in such a form that a rubber layer 33b is attached to the peripheral surface of a large-diameter metal roller 33a to reduce durability and explosion resistance and damage to the weft Y. In order to improve exchangeability, the rubber layer 33b is externally fitted to the metal roller 33a in a state where the diameter is increased by elastic deformation. The rubber layer 33b is formed of a soft rubber such as urethane rubber, for example, so as to increase the frictional force with the weft Y.
[0044]
The driven roller 35 of the roller pulling device 30 is a metal roller having a smaller diameter than the drive roller 33 and is disposed obliquely above the traverse lever 52 with respect to the drive roller 33. The driven roller 35 is rotatably attached to an arm 36 that is swingably attached to a side wall 46c by a pin 37. A spring 39 spanned between the side wall 46c and the arm 36 biases the driven roller 35 toward the driving roller 33. The circumferential surface of the driving roller 33 and the circumferential surface of the driven roller 35 are in pressure contact with each other, whereby the driving force of the driving roller 33 that is rotationally driven by the motor 31 is transmitted to the driven roller 35, and the driving roller 33 and the driven roller 35 rotate in the opposite directions at the same peripheral speed. An inclined surface 35a is formed on the entire outer peripheral end surface of the driven roller 35 so that the weft Y can be easily put in and out of the contact surface between the driving roller 33 and the driven roller 35 by the inclined surface 35a, that is, the traverse lever 52. Makes it easy to switch the weft Y.
[0045]
In the initial stage of pulling when the traversing lever 52 moves the yarn path of the weft Y to the driving side roller 33 and the driven side roller 35 during the rotational driving of the roller pulling device 30, the holding means 60 temporarily holds the yarn path. The weft is formed so as to be separated from the roller side, and is attached on a cover 61 straddling the front wall 46 a and the rear wall 46 b of the fixed base 46.
[0046]
In the case of the first embodiment, the holding means 60 has a rod shape made of a metal such as aluminum substantially parallel to the roller axis L of the roller pulling device 30, and includes an upper guide 60a, a lower guide 60b, and a stepped portion 60c. It is formed as a weft guide having. The upper guide 60a contacts the weft Y and guides the weft Y toward the attitude control nozzle 71 when the pulling speed of the weft Y by the attitude control nozzle 71 becomes equal to or higher than the feed speed of the weft Y by the roller pulling device 30. Is.
[0047]
The lower guide 60b guides the weft Y in contact with the weft Y separated from the driving roller 33 and the driven roller 35 of the roller pulling device 30, and a stopper 60d is provided at the end of the lower guide 60b. Projecting toward
[0048]
The stepped portion 60c connects the upper guide 60a and the lower guide 60b, and the yarn path of the weft Y is on the side of the driving side roller 33 and the driven side roller 35 during the rotational driving of the roller traction device 30. At the initial stage of traction to be moved, the weft Y is held so that the yarn path temporarily becomes the non-traction yarn path Y2 that is separated from the driving roller 33 and the driven roller 35 side. Further, the step portion 60c is formed as an inclined surface having a C shape in which the lateral width in the direction along the axis L gradually increases as it goes from the upper guide 60a to the lower guide 60b when viewed from the roller pulling device 30 side. ing.
[0049]
As the holding means 60, the entire body is made of metal and has a slidability and durability with respect to the weft Y. However, the main body is formed of a material having low slidability and durability with respect to the weft Y, and the weft Y of the main body A surface layer made of a material having slipperiness and durability with respect to the weft Y may be formed on the surface in contact with.
[0050]
The cover 61 has a horizontal surface portion 61a and an inclined surface portion 61b. The horizontal surface portion 61 a extends from the rear wall 46 b toward the driving side roller 33 so as not to interfere with the driving side roller 33 at a higher level than the driving side roller 33. The holding means 60 is disposed on the horizontal surface portion 61a so as to be positioned on the inclined surface portion 61b side. The inclined surface portion 61b extends obliquely from the horizontal surface portion 61a toward the front wall 46a. A long hole 61c is formed in the inclined surface portion 61b. The elongated hole 61c is formed in such a manner that the periphery of the contact portion between the driving side roller 33 and the driven side roller 35 is taken in so as not to interfere.
[0051]
The slack deformation means 20 extends upward from the rear end of the cover 61, and has a lower vertical surface portion 20a and an upper inclined surface portion 20b. In the vertical surface portion 20a, a weft guide 20c as a weft guide through which the weft Y is passed is provided at a position facing the attitude control nozzle 71 coaxially. The inclined surface portion 20 b is inclined toward the roller pulling device 30, and a slack portion of the weft Y discharged into the space from between the contact surfaces of the driving side roller 33 and the driven side roller 35 of the roller pulling device 30 is a weft guide. It is stored in the space without colliding with 20c, and during that time, the pulling speed of the attitude control nozzle 71 is increased to guide the weft Y to be drawn into the weft guide 20c. The slack deformation means 20 is configured as the same body as the cover 61, but may be formed separately from the cover 61 and attached to the fixed base 46.
[0052]
2 to 4 show the operation from the start of weft insertion of the important portion shown in FIG. 1 until the difference between the pulling speed of the weft Y by the roller pulling device 30 and the pulling speed of the attitude control nozzle 71 disappears.
[0053]
In FIG. 2A, immediately after the start of weft insertion when the injection for weft insertion of the attitude control nozzle 71 has started, the traction speed by the attitude control nozzle 71 is relatively low, and the traverse lever 52 stops at the non-traction position. is doing. As a result, the weft Y passes through the weft guide 53 of the traverse lever 52 from the yarn guide 18 and passes away from the driving side roller 33 and the driven side roller 35 of the roller pulling device 30, and then retained. The lower guide 60b of the means 60, the stepped portion 60c, the connecting corner, that is, the lower position Q1 of the stepped portion 60c, and further pulled by the attitude control nozzle 71 through the weft guide 20c of the slack deformation means 20 It exists in the route Y2.
[0054]
FIG. 2b is a diagram following FIG. 2a, immediately after the traverse lever 52 starts moving from the non-traction position to the traction position, and the traction speed by the attitude control nozzle 71 does not increase so much. It is considerably lower than the traction speed by the device 30. Then, when the traverse lever 52 starts to move, the weft Y between the weft guide 53 of the traverse lever 52 and the lower position Q1 of the step portion 60c is separated from the roller pulling device 30 with the lower position Q1 as a fulcrum. This is the moment when a portion of the weft Y is caught in the end portion between the contact surfaces of the driving roller 33 and the driven roller 35 after approaching the roller pulling device 30 side. At this time, the weft Y in the holding means 60 remains at the lower position Q1 and does not move to the upper guide 60a due to the balance between the tension of the weft Y and the inclination angle of the stepped portion 60c.
[0055]
FIG. 2c shows the state where the traverse lever 52 is further moved from the non-traction position to the traction position side after the above-described FIG. B, and is an end portion between the contact surfaces of the driving roller 33 and the driven roller 35. At this time, the weft Y that has been bitten by the roller is released downstream by the pulling speed of the roller pulling device 30 that is faster than the pulling speed of the attitude control nozzle 71. In this case, the thread path A of the weft Y discharged to the holding means 60 side from the contact surface between the driving roller 33 and the driven roller 35 and the thread path B of the weft Y locked to the lower position Q1. Are separated in a direction along the roller axis L. For this reason, the leading end A1 of the weft Y that moves along the new yarn path A generated by the pulling of the roller pulling device 30 moves along the yarn path B that passes through the lower position Q1 by the pulling of the attitude control nozzle 71. It is far from the rear end B1 of the moving weft Y. Therefore, like a Z-shaped loop that is flat in the vertical direction and extends in the direction of the roller axis L between the front end portion A1 of the weft Y on the yarn path A and the rear end portion B1 of the weft Y on the yarn path B. A curved portion C is formed. That is, by staying at the lower position Q1 of the weft Y, the leading end A1 of the weft Y on the yarn path A side and the rear end B1 of the weft Y on the yarn path B side approach each other in the direction of the roller axis L. Therefore, the portion between the front end portion A1 of the weft Y on the yarn path A side and the rear end portion B1 of the weft Y on the yarn path B side is not abruptly bent like a hairpin curve approaching each other. .
[0056]
FIG. 3 a is a state following the c diagram of FIG. 2, in which the traverse lever 52 has stopped moving to the traction position, and the curved portion C is raised above the holding means 60 by traction by the roller traction device 30. To float in the air. By the rising of the curved portion C, the weft Y is separated from the lower position Q1 above the stepped portion 60c along the inclined surface of the stepped portion 60c on the holding means 60 side.
[0057]
In FIG. 3 b, following the above-mentioned a diagram, the traverse lever 52 remains in the state of being stopped at the pulling position, and the bending portion C sags the holding means 60 by pulling by the roller pulling device 30. The curved portion C due to the fact that the curved portion C is lifted to the air while being further lifted to the side of the curved portion C, and the weft Y is delayed and separated from the step portion 60c on the holding means 60 side as the curved portion C is lifted. C opens in an S-shape that is flat in the direction of the roller axis L and spreads in the vertical direction, and the entanglement of the curved portion C does not occur.
[0058]
In FIG. 3c, the traction speed of the attitude control nozzle 71 is substantially close to the traction speed of the roller traction device 30 following the above-described FIG. B, and the S-shaped curved portion C is gently in the weft insertion direction. It becomes a sagging drawing of Yamagata.
[0059]
In the a diagram of FIG. 4, following the c diagram of FIG. 3, the pulling speed of the attitude control nozzle 71 is equal to or higher than the pulling speed of the roller pulling device 30, and the weft Y is free from sagging. Is in contact with the upper guide 60 a of the holding means 60. The contact position of the weft Y with the upper guide 60a is Q2. Then, the weft Y is subjected to a weft insertion operation by the cooperation of the pulling by the roller pulling device 30 and the pulling by the attitude control nozzle 71.
[0060]
In FIG. 4b, the traverse lever 52 is moved from the traction position to the non-traction position following the a chart, and the weft Y is moved to the traction path Y1 indicated by the phantom line by the movement of the traverse lever 52. In the process toward the non-traction path Y2 indicated by the solid line, after sliding on the upper guide 60a in the direction of the arrow X from the contact position Q2, the stepped portion 60c is slid down to reach the lower position Q1. Then, since the traverse lever 52 stops at the non-traction position until the movement to the traction position side of the next weft insertion cycle starts, the weft Y exists in the non-traction path Y2 indicated by the solid line. Then, the next weft insertion cycle is started and the injection for weft insertion of the attitude control nozzle 71 is started, whereby the operations from FIG. 2a to FIG. 4b are repeated.
[0061]
In short, according to the structure of the first embodiment, the traverse lever 52 of the switching device 50 moves the yarn path of the weft Y to the side of the driving roller 33 and the driven roller 35 during the rotational driving of the roller pulling device 30. In the initial stage, when the pulling speed by the roller pulling device 30 is equal to or higher than the pulling speed by the attitude control nozzle 71, as shown in FIGS. 2B to 2D, the balance between the tension of the weft Y and the inclination angle of the step 60c. As a result, the holding means 60 temporarily holds the weft Y at the lower position Q1 separated from the driving side roller 33 and the driven side roller 35.
[0062]
This point will be described with reference to a plan view shown in FIG. FIG. 4 shows a change state of the weft yarn Ya in the first embodiment provided with the holding means 60 by a solid line, a change state of the weft Yb in a proportion without the holding means 60 shown by an imaginary line, and the yarn guide 18. The illustration is omitted.
[0063]
5A, the traverse lever 52 starts to move from the non-traction position to the traction position, and the wefts Ya and Yb are caught between the driving roller 33 and the driven roller 35 of the roller traction device 30. This shows a state corresponding to FIG.
[0064]
In FIG. 5b, the traverse lever 52 further moves from the non-traction position to the traction position, and the wefts Ya and Yb caught between the driving side roller 33 and the driven side roller 35 are the attitude control nozzles. FIG. 2 shows a state corresponding to FIG. 2C when discharged to the downstream side by the pulling speed of the roller pulling device 30 higher than the pulling speed of 71.
[0065]
FIG. 5c shows a state in which the traverse lever 52 stops moving to the pulling position and the curved portions Ca and Cb of the wefts Ya and Yb are released so as to float above the holding means 60. FIG. The state corresponding to the figure is shown.
[0066]
Considering FIG. 5, in the first embodiment, the tip A <b> 1 of the weft Ya moving along the new yarn path generated by the pulling of the roller pulling device 30 and the posture control nozzle are temporarily held by the holding means 60. 71, the portion between the rear end B1 of the weft Ya moving along the yarn path B passing through the lower position Q1 by the pulling of 71 is a curved portion Ca (described above) that extends in the direction of the roller axis L This is the same as the curved portion C), and it is possible to prevent the weft Ya from being entangled in the portion even if the weft Ya is a strong twisted yarn.
[0067]
On the other hand, in the conventional example indicated by the chain line, since there is no holding means 60, the leading end A1 of the weft Yb moving along the new yarn path A generated by the pulling of the roller pulling device 30 and the posture control nozzle 71 The portions between the rear end b1 of the weft Yb that moves along the towing yarn path b are close to each other in the direction of the roller axis L, so that the curved portion Cb like a sharply bent hairpin curve is obtained. Thus, it is obvious that the weft Yb is likely to be entangled even with a weakly twisted yarn.
[0068]
Further, since the holding means 60 is formed as a weft guide having an upper guide 60a and a stepped portion 60c connected to the outside, a swing of the traverse lever 52 from the non-traction position to the traction position side causes the weft Y to move. By utilizing the tension, the weft Y can be held on the step portion 60c, and the structure of holding the weft Y at a position where the yarn path of the weft Y is temporarily separated from the roller pulling device 30 can be simplified.
[0069]
In addition, since the step portion 60c is formed as an inclined surface, the weft Y is switched from non-traction to traction with respect to the roller traction device 30 by the traverse lever 52 by setting the inclination angle to a value that balances the tension of the weft Y. As a temporary holding position when the weft Y is switched from traction to non-traction with respect to the roller traction device 30 by the traverse lever 52. The return to the side position Q1 can be appropriately performed by the tension of the weft Y.
[0070]
Further, since the holding means 60 has the stopper 60d at the end of the lower guide 60b, the inconvenience that the weft Y is disengaged from the holding means 60 can be solved.
[0071]
Second embodiment
In the first embodiment, the holding means 60 is formed as a rod-shaped weft guide substantially parallel to the roller axis L. However, in the second embodiment, as shown in FIGS. It is characterized by being formed as an inclined surface that intersects in the front-rear direction.
[0072]
That is, FIG. 8 shows the outer appearance of the yarn guide 18, the switching device 50, the roller pulling device 30, the holding means 60 and the slack deformation means 20 of the second embodiment. In FIG. 8, the holding means 60 has an upper guide 60a substantially parallel to the roller axis L of the roller pulling device 30, and a stepped portion 60e having an inclined surface extending obliquely from the upper guide 60a toward the roller axis L. Shaped as a weft guide. The stepped portion 60e corresponds to the stepped portion 60c of the first embodiment, and when viewed from above, the lateral width in the direction along the axis L gradually increases as going from the upper guide 60a to the roller pulling device 30 side. The stopper 60d protrudes upward at the lower end of the slope. The holding means 60 is attached to the cover 61 by disposing the bottom surface of the upper guide 60a on the horizontal surface portion 61a of the cover 61 and disposing the bottom surface of the step portion 60e across the horizontal surface portion 61a and the inclined surface portion 61b. ing.
[0073]
9A shows a plan view of the holding means 60, FIG. 9B shows a side view of the holding means 60, and FIG. 9C shows a cross section taken along line AA of FIG. 9A. In FIG. 9, the upper guide 60 a has an upper surface formed as an inclined surface that smoothly continues to the inclination of the upper surface of the stepped portion 60 e in the entire width direction. The stepped portion 60e has an inclination angle θ from the upper guide 61a on the upper surface as the inclined surface to the stopper 60d, for example, 30 ° to 35 °, and has an inclination that gently falls from the outside to the inside on the upper surface. The bottom surface has a cutout portion 60f aligned with the horizontal surface portion 61a and the inclined surface portion 61b of the cover 61.
[0074]
According to the structure of the second embodiment, as shown in FIG. 8, since the stepped portion 60e of the holding means 60 is formed as an inclined surface that obliquely intersects the roller axis L, the inclination angle of the stepped portion 60e is changed. It is possible to prevent the lower position Q1 as a temporary holding position of the weft Y when it is set to an appropriate value that balances the tension of the weft Y from being too far from the roller traction device 30, The movement range required for switching can be reduced.
[0075]
In FIG. 8, a solid line weft Y indicates a state where the traverse lever 52 has moved to the non-traction position, and an imaginary line weft Y indicates a state where the traverse lever 52 has moved to the pull position.
[0076]
Third embodiment
In the first embodiment and the second embodiment, the holding means 60 is formed in an immovable form, but in the third embodiment, as shown in FIG. 10, the holding means 62 corresponding to the holding means 60 is formed in an electromagnetic drive type. It is characterized by that.
[0077]
In FIG. 10a, the holding means 62 has an actuator 62a such as an electromagnetically driven rotary solenoid attached to the lower surface of the cover 61, and is fixed so that the movable arm 62b extends laterally on the output shaft of the actuator 62a. The tip of the movable arm 62b is bent upward to form a hook portion 62c, and the hook portion 62c is inserted into the horizontally long slit 62e of the guide member 62d provided on the horizontal surface portion 61a of the cover 61 from below. Projecting upward. Then, by driving the actuator 62a according to an instruction from the actuator drive command generating device 123 shown in FIG. 1, the hook portion 62c is moved to the separation position A shown by the solid line and the approach position B shown by the dotted line. The solid line in FIG. A shows that the hook portion 62c stops at the separation position a, and the traverse lever 52 (see FIG. 1) starts moving from the non-traction position to the traction position immediately after the weft insertion starts. Is a state immediately after being bitten between the driving roller 33 (see FIG. 1) and the driven roller 35 (see FIG. 1).
[0078]
FIG. 10b shows that the traverse lever 52 is further moved from the non-traction position to the traction position side, so that the weft Y thread path A caught between the driving roller 33 and the driven roller 35 is Since the yarn path B of the weft Y locked to the hook portion 62c is separated in the direction along the roller axis L (see FIG. 1), the new yarn path A generated by the pulling of the roller pulling device 30 is separated. A Z-shaped curved portion C is provided between the leading end A1 of the weft Y that moves along the rear end B1 of the weft Y that moves along the yarn path B that is pulled by the attitude control nozzle 71 (see FIG. 1). It is in a formed state.
[0079]
In FIG. 10c, the traverse lever 52 stops moving to the pulling position, and thus the curved portion C is lifted above the holding means 60 by pulling by the roller pulling device 30 (see FIG. 1). The weft Y is lifted and the weft Y is separated from the hook 62c upward on the side of the hook 62c.
[0080]
FIG. 10d shows a state where the traverse lever 52 has stopped moving to the pulling position, and the curved portion C is lifted to the air while being further lifted over the hook portion 62c by the pulling by the roller pulling device 30. The portion 62c is instantaneously moved from the separation position i to the approach position b, and the lower space of the weft Y where the hook portion 62c has floated is crossed from the separation position i side to the approach position b side.
[0081]
In FIG. 10e, the traverse lever 52 is stopped moving to the pulling position, the pulling speed of the attitude control nozzle 71 becomes equal to or higher than the pulling speed of the roller pulling device 30, and the weft Y contacts the guide member 62d of the holding means 60. In this state, the weft Y is located on the side of the separation position A with respect to the hook portion 62c at the approach position B.
[0082]
FIG. 10f shows that the weft Y has slid in the direction of the arrow X on the guide member 62d due to the movement of the traverse lever 52 from the traction position to the non-traction position, or the traverse lever 52 pulls. The hook portion 62c instantaneously moves from the approach position B to the separation position A after the movement to the non-traction position from the position is stopped, and the hook portion 62c moves the weft Y that has slid on the guide member 62d to the separation position. It is in the state carried to Lee. Thereafter, the next weft insertion cycle is started and injection for weft insertion of the attitude control nozzle 71 is started, so that FIGS. 10a to 10f are repeated.
[0083]
According to the third embodiment, although the structure is complicated, the weft Y can be more reliably held at the separation position A.
[0084]
In the third embodiment, the electric type in which the hook portion 62c of the holding means 62 is moved and stopped in the lateral direction has been described. However, the movable side grip is moved toward and away from the fixed side grip by the electromagnetic solenoid, and the movable side grip is brought close to or in contact therewith. Alternatively, a gripper device of a type that holds the weft Y by the fixed grip and releases the movable weft Y by moving the movable grip away from the fixed grip may be used instead.
[0085]
【The invention's effect】
Book invention Weft insertion device for loom according to According to the present invention, when the weft insertion is performed by switching between the traction of the weft and the non-traction of the roller traction device provided between the length measuring storage device and the attitude control nozzle by the switching device, the roller of the roller traction device In the initial stage of starting towing, the weft is held by the holding means so that the weft yarn path is temporarily separated from the roller side. The yarn path is separated in the direction of the roller axis. Therefore, the weft sagging that occurs in the initial stage of pulling by the roller becomes a curved portion that spreads greatly in the direction of the roller axis, and it is possible to prevent the weft from being entangled in the curved portion, and weaving a cloth without weaving defects. be able to. Moreover, Since the holding means is formed as a weft guide having an upper guide and a stepped portion that extends outward from the upper guide, the step of the weft is stepped using the tension of the weft by swinging the traverse lever from the non-traction position to the traction position side. The structure in which the weft yarn is held at the position where the weft yarn path is temporarily separated from the roller pulling device can be simplified. Stepped portion formed as an inclined surface if , Temporary holding when the weft is switched from non-traction to traction with respect to the roller traction device by the switching device, release of the temporary holding form, and wetting of the weft with respect to the roller traction device by the switching device The temporary return to the holding position when switching to non-traction can be appropriately performed by the tension of the weft. Inclined surface is formed to extend in the direction crossing the roller axis of the roller traction device. if The position of the holding means for temporarily holding the weft can be prevented from being separated too far outward in the roller axial direction from the roller traction device, and the moving range required for switching between non-traction and traction of the traverse lever can be reduced. .
[Brief description of the drawings]
FIG. 1 is a perspective view showing an important part of a weft insertion device according to a first embodiment.
FIG. 2 is an operation explanatory diagram of the first embodiment.
FIG. 3 is an operation explanatory diagram of the first embodiment.
FIG. 4 is an operation explanatory diagram of the first embodiment.
FIG. 5 is a plan view showing a weft change state in comparison with the first embodiment.
FIG. 6 is a schematic view showing the entire weft insertion device according to the first embodiment.
FIG. 7 is a timing chart at the time of steady operation of the loom according to the first embodiment.
FIG. 8 is a perspective view showing an important part of a weft insertion device according to a second embodiment.
FIGS. 9A and 9B show holding means of a second embodiment, in which FIG. A is a plan view, FIG. B is a side view, and FIG.
FIG. 10 is a perspective view showing an important part of a weft insertion device according to a third embodiment.
FIG. 11 is an operation explanatory view of a conventional weft insertion device.
FIG. 12 is an operation explanatory view of a conventional weft insertion device.
[Explanation of symbols]
10 Measuring storage device
30 Roller traction device
33 Driving roller
35 Driven roller
50 switching device
52 Traverse lever
53 Weft Guide
60, 62 holding means
60a Upper guide
60c, 60e Stepped part
62a Actuator
62b Movable arm
62c hook part
62d Guide member
26e slit
71 Attitude control nozzle

Claims (3)

A length measuring storage device, a roller pulling device that pulls the weft yarn from the length measuring storage device with a roller that rotates, a switching device that switches between a weft pulling position and a non-traction position by a roller of the roller pulling device, In a weft insertion device of a loom having a posture control nozzle that causes wefts pulled by operation to fly into a warp opening by fluid injection and perform weft insertion, at the initial stage of starting towing by the switching device, the wefts from the roller side A holding means for temporarily storing at a separated position is provided , and the holding means is constituted by a weft guide between the roller pulling device and the attitude control nozzle and extending along a substantially axial direction of the roller of the roller pulling device, The weft guide includes at least an upper guide for guiding the weft downward at the end of pulling by the roller, and extends downward from the upper guide. Weft insertion device of a loom, characterized in that it includes a step portion for holding induce weft separating position from the over La side to a position away between the weft from the roller side to immediately after the start of the roller traction following weft insertion . The weft insertion device for a loom according to claim 1 , wherein the step portion is formed as an inclined surface extending downward. The weft insertion device for a loom according to claim 2 , wherein the inclined surface is formed so as to extend in a direction crossing back and forth with respect to a roller axis of the roller pulling device.

Images