JPH09217248A - Weft selector in loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately arrange a selector of switching positions of weft between a waiting position and a weft inserting position at a position corresponding to a prescribed timing. SOLUTION: In this loom, a selection bar 12 driven by a rotary solenoid 20 is arranged in switching to a waiting position expressed by a chain line and a weft inserting position expressed by a solid line. Similarly, selection bars 13-15 driven by rotary solenoids 21-23 are arranged in switching to waiting position expressed by solid lines and weft inserting positions expressed by chain lines. Positions of top ends of every selection bars 12-15 placed on the weft inserting positions are made to gather on a line L1. A projector 28 and a receiver 29 are opposingly placed on the line L1. Light projected from the projector 28 proceeds on the line L1 and the top ends of the selection bars 12-15 placed on the weft inserting positions cross to an optical path expressed by the line L1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft selecting device in a loom equipped with a selection body for selecting and arranging wefts from a standby position to a weft insertion position.

[0002]

2. Description of the Related Art A weft selecting device of this type is disclosed in Japanese Patent Laid-Open No. 6-19.
It is disclosed in Japanese Patent No. 2944. In this conventional device,
A needle for switching the weft yarn between the yarn feeding position and the standby position is driven by a stepping motor. The stepping motor is connected to the control device, and the control device supplies a predetermined pulse train to the stepping motor to control the rotation amount of the stepping motor, that is, the movement amount of the needle. The control device can change the pulse frequency of the pulse train, and the control device variably controls the pulse frequency based on the angle detection information obtained from the angle detector that detects the rotation angle of the stepping motor. There is a description that the needle can reach a predetermined position at a predetermined timing by such variable control.

[0003]

A crank mechanism is used in the transmission system that transmits the driving force of the stepping motor to the needle. Therefore, although the rotation angle of the stepping motor is accurately detected by the angle detector, the original position corresponding to the rotation angle at which the needle is detected due to the mounting accuracy of the crank mechanism, wear of the crank mechanism, etc. May not be located in The permissible range of timing for switching the weft yarns between the standby position and the weft insertion position is that the gripper that inserts the weft yarns stays in the warp opening for a long period of time, Limited to a very narrow range to avoid contact or needle-to-needle contact. Therefore, a situation in which the needle is not arranged at the original position corresponding to the detected rotation angle causes problems such as miss catching of the weft thread by the gripper, occurrence of thread breakage, and damage to the needle.

According to the present invention, a weft thread switching arrangement between a standby position and a weft insertion position is accurately placed at a position corresponding to a set timing to accurately catch a weft thread, break the thread, and damage the selection body. The purpose is to solve such problems.

[0005]

To this end, according to the invention of claim 1, a position detection for detecting the presence or absence of the motion control target at least at one position on the movement path of the motion control target of either the selection body or the weft. A weft selecting device having means was constructed.

According to the first aspect of the present invention, at least one of the selection body and the weft on the actual movement path of the operation control target is selected.
The presence or absence of the motion control target at one position is detected by the position detecting means. By detecting the actual position of the motion control target, it is possible to perform highly accurate motion control of the motion control target thereafter. Further, it is possible to grasp the abnormality of the actuator that drives the selection body or the drive transmission system from this actuator to the selection body.

According to a second aspect of the present invention, there is provided adjusting means for adjusting the driving force or driving timing of the driving means for driving the selection body, and the adjusting means of the adjusting means is based on the detection result of the operation control target by the position detecting means. The adjustment was performed.

The adjusting means adjusts the driving force or the driving timing of the driving means based on the detection result. By performing such adjustment, it is possible to perform highly accurate motion control of the motion control target.

According to the third aspect of the present invention, the presence or absence of the operation control target at the weft insertion position is detected by the position detecting means. If the actual presence / absence of the motion control target at the weft insertion position is detected, the subsequent placement of the motion control target at the weft insertion position can be accurately performed according to the set weft catch timing.

According to the fourth aspect of the invention, the presence or absence of the operation control target at the standby position is detected by the position detecting means. If the actual presence / absence of the motion control target at the standby position is detected, the subsequent placement of the motion control target at the standby position can be accurately performed according to the set weft catch timing.

According to a fifth aspect of the present invention, a weft selecting device is provided with the position detecting means of the third aspect and the position detecting means of the fourth aspect. By detecting the actual positions of the motion control objects placed at the weft insertion position and the standby position, the subsequent placement of the operation control target at the weft insertion position and the standby position can be performed accurately according to the set weft catch timing. .

According to the sixth aspect of the invention, the presence or absence of a plurality of motion control objects at the weft insertion position is detected by using the position detecting means having the detection area on a straight line. According to the invention of claim 6, the presence or absence of the plurality of selection bodies arranged at the weft insertion position can be detected by the single position detection means.

According to the seventh aspect of the present invention, the presence or absence of a plurality of operation control targets at the standby position is detected by using the position detection means having the detection area on a straight line. According to the invention of claim 7, the presence or absence of the plurality of selection bodies arranged at the standby position can be detected by the single position detecting means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment embodying the present invention will be described below with reference to FIGS.

Reference numeral 11 is a weft-inserting rapier head that is inserted into the warp opening, and wefts Y1, Y2, Y3 and Y4 are inserted by inserting the weft-inserting rapier head 11 into the warp opening. As shown in FIG. 1, the weft Y1 has a selection bar 12
Through the guide hole 121 at the tip of the selection bar 13, and the weft Y2 is passed through the guide hole 131 at the tip of the selection bar 13. The weft Y3 is passed through the guide hole 141 at the tip of the selection bar 14, and the weft Y4 is at the guide hole 15 of the tip of the selection bar 15.
It has been passed through 1. The wefts Y1 to Y4 are tensors 49, 5
It is guided to the guide holes 121 to 151 via 0, 51 and 52.

The selection bars 12 to 15, which are selection bodies for switching the wefts between the standby position and the weft insertion position, are guided by cylindrical guides 16, 17, 18, and 19 so as to be movable up and down. Rotary solenoids 20, 21, 22, and 23 are arranged above the selection bars 12 to 15. Crank levers 201, 211, 221, 231 are fixedly attached to the output shafts of the rotary solenoids 20-23. The rotary solenoids 20 to 23 reciprocate, and the reciprocal rotation of the crank levers 201 to 231 is converted into vertical movement of the selection bars 12 to 15 via the connecting bars 24, 25, 26, and 27.

As shown in FIGS. 1 and 2, the selection bar 12
Is switched between a standby position shown by a chain line and a weft inserting position shown by a solid line. The other selection bars 13 to 15 are arranged to be switched between a standby position shown by a solid line and a weft inserting position shown by a chain line. When the selection bars 12 to 15 are at the standby position, the wefts Y1 to Y4 are arranged at the standby position away from the moving path of the weft-insertion rapier head 11. When the selection bars 12 to 15 are arranged at the weft inserting position, the wefts Y1 to Y4 are arranged at the weft inserting position intersecting the movement path of the weft inserting rapier head 11. The weft inserting rapier head 11 catches the weft yarn arranged at the weft inserting position and inserts the weft yarn into the warp yarn opening.

Each selection bar 12 disposed at the weft insertion position
The positions of the tips of 15 are aligned with the straight line L1 shown in FIGS. A light projector 28 and a light receiver 29 are arranged to face each other on the straight line L1. The light projected from the projector 28 travels on the straight line L1, and the tips of the selection bars 12 to 15 arranged at the weft insertion position intersect the optical path indicated by the straight line L1. The position detecting means composed of the light projector 28 and the light receiver 29 has a detection area on the straight line L1.

The light receiver 29, which constitutes the position detecting means together with the light projector 28, converts the received light into an electric signal and outputs it to the drive control circuit 30. When the selection bars 12 to 15 are in the weft inserting position, the light receiver 29 does not output an electric signal, and when the selection bars 12 to 15 are not in the weft inserting position, the light receiver 2
9 outputs an electric signal. The drive control circuit 30 controls the operation of the rotary solenoid 20. The other rotary solenoids 21 to 23 are controlled by another drive control circuit (not shown) similar to the drive control circuit 30.

The drive control circuit 30 includes a positive voltage control circuit 31.
And a negative voltage control circuit 32. Positive voltage control circuit 31
Is composed of a drive circuit 33, a voltage adjustment circuit 34, and an excitation timing circuit 35. The negative voltage control circuit 32 includes a drive circuit 36, a voltage adjustment circuit 37, and an excitation timing circuit 38. The voltage adjustment circuit 34 adjusts the voltage value output from the positive power supply circuit 39 to the drive circuit 33. Voltage adjustment circuit 3
Reference numeral 7 adjusts the negative voltage value output from the negative power supply circuit 40 to the drive circuit 36. The electric signal output from the light receiver 29 is input to the voltage adjusting circuit 34. The drive circuit 33 applies a positive voltage to the rotary solenoid 20 based on the excitation signal input from the excitation timing circuit 35. The drive circuit 36 applies a negative voltage to the rotary solenoid 20 based on the excitation signal input from the excitation timing circuit 38.

A weft selection pattern is stored in the loom control computer C which controls the operation of the entire loom. The weft selection pattern is information indicating the weft insertion order of the wefts Y1 to Y4. The loom control computer C issues an excitation command to the excitation timing circuits 35 and 38 based on the rotation angle information from the rotary encoder 41 for detecting the rotation angle of the loom. The excitation timing circuits 35 and 38 output the excitation signal at a predetermined timing based on the excitation command from the loom control computer C and the rotation angle information from the rotary encoder 41.

A waveform A in FIG. 4 represents a pulse signal output from the rotary encoder 41 a predetermined number per revolution of the loom, and a waveform Z is an origin signal output once per revolution of the loom. The origin signal is output at the time of beating. The waveform C1 in FIG. 4 represents the excitation signal output from the excitation timing circuit 35 to the drive circuit 33, and the waveform C2 represents the excitation signal output from the excitation timing circuit 38 to the drive circuit 36. The excitation timing circuit 35 outputs the excitation signal C1 after a predetermined number of pulse signals A have been input since the origin signal Z was input. The excitation timing circuit 38 outputs an excitation signal C2 after a predetermined number of pulse signals A have been input since the origin signal Z was input.

The waveform F1 in FIG. 4 represents the voltage applied from the drive circuit 33 to the rotary solenoid 20 based on the excitation signal C1. The waveform F2 represents the voltage applied from the drive circuit 36 to the rotary solenoid 20 based on the excitation signal C2. The selection bar 12 is rotatably arranged by applying a positive voltage to the rotary solenoid 20 to a weft insertion position shown by a solid line. By this rotation arrangement, the weft yarn Y1 is selectively arranged from the standby position to the weft insertion position. The selection bar 12 in the weft insertion position is rotated to the standby position by applying a negative voltage to the rotary solenoid 20. By this rotation arrangement, the weft yarn Y1 is selectively arranged from the weft insertion position to the standby position. The rotary solenoids 20 to 23 are bistable solenoids, and are voltages for holding the rotary solenoids 20 to 23 at the rotational angle positions of the rotary solenoids 20 to 23 corresponding to the standby position and the weft inserting position of the selection bars 12 to 15. No application is necessary.

The voltage in the positive power supply circuit 39 is + Vo, and the voltage in the negative power supply circuit 40 is -Vo. The voltage adjusting circuit 34 is for changing and setting the positive voltage + Vo to a voltage as shown by the waveform F1 in FIG. The voltage adjusting circuit 37 changes and sets the negative voltage −Vo to a negative voltage as shown by the waveform F2.

A rotation speed detecting circuit 42 is connected to the voltage adjusting circuits 34 and 37 serving as adjusting means. The voltage adjustment circuits 34 and 37 adjust the reference applied voltage to the rotary solenoid 20 based on the loom rotation speed information obtained from the rotation speed detection circuit 42. The rotation speed detection circuit 42 calculates the rotation speed of the loom from the number of input pulse signals Z per unit time obtained from the rotary encoder 41.
The larger the number of input pulse signals Z per unit time, the higher the rotational speed of the loom. Each of the voltage adjusting circuits 34 and 37 stores a data table showing the correspondence relationship between the rotation speed and the applied voltage. The voltage adjusting circuit 34 determines the reference positive voltage applied to the rotary solenoid 20 based on the rotation speed of the loom and the data table. The voltage adjusting circuit 37 determines the reference negative voltage applied to the rotary solenoid 20 based on the rotation speed of the loom and the data table. The faster the loom rotation speed, the larger the absolute values of the reference positive voltage and the reference negative voltage. By setting such a reference voltage, a switching arrangement without delay of the selection bar 12 is guaranteed.

The curve E in FIG. 3 represents the displacement of the tips of the selection bars 12 to 15 that are switched between the standby position and the weft inserting position. The horizontal axis θ represents the loom rotation angle. The loom rotation angle θ1 represents the timing at which the weft-insertion rapier head 11 starts to enter into the opening of the warp yarn T. Loom rotation angle θ1
Indicates the timing at which the weft-insertion rapier head 11 retracts from the opening of the warp T. The downward slope portion of the curve E represents the transition of the selection bars 12 to 15 from the standby position to the weft insertion position, and the upward slope portion of the curve E represents the transition of the selection bars 12 to 15 from the weft insertion position to the standby position. As shown in the figure, the allowable range of the timing for switching the selection bars 12 to 15 between the standby position and the weft inserting position is that the weft-inserting rapier head 11 for inserting the wefts has entered the opening of the warp T. It has a long period, and a plurality of wefts Y1 to be used.
It is limited to a very narrow range to avoid contact between Y4 or between select bars 12-15.

The voltage adjusting circuit 34 grasps the input stop timing and the input start timing of the electric signal based on the loom rotation angle information obtained from the rotary encoder 41. The input stop timing of the electric signal represents the timing when the selection bars 12 to 15 reach the weft inserting position. Further, the input start timing of the electric signal represents the timing at which the selection bars 12 to 15 are retracted from the weft insertion position. The timing θ3 at which the selection bar 12 reaches the weft insertion position is stored in the voltage adjustment circuit 34 in advance. When the detected input stop timing is earlier than the set timing θ3, the voltage adjustment circuit 34 corrects the reference positive voltage so as to reduce the value of the positive voltage applied to the rotary solenoid 20 next time. By this correction, the moving speed of the selection bar 12 from the standby position to the weft insertion position next time becomes slower, and the selection bar 12 reaches the weft insertion position so as to match the set timing. When the detected input stop timing is later than the set timing θ3, the voltage adjustment circuit 34 corrects the reference positive voltage so as to increase the value of the positive voltage applied to the rotary solenoid 20 next time. By this correction, the moving speed of the selection bar 12 from the standby position to the weft insertion position is increased next time, and the selection bar 12 reaches the weft insertion position so as to match the set timing.

The driving force for vertically moving the selection bars 12 to 15 is the rotary solenoids 20 to 23 via the connecting bars 24 to 27 and the crank levers 201 to 231.
Obtained from In such a power transmission system, the rotation angles of the rotary solenoids 20 to 23 and the vertical positions of the selection bars 12 to 15 may deviate from their original correspondence due to assembly accuracy, wear, and the like. Therefore, JP-A-6-19
Even if the rotation angles of the rotary solenoids 20 to 23 are detected and the vertical positions of the selection bars 12 to 15 are grasped as in the conventional device of 2944, the actual vertical positions of the selection bars 12 to 15 are confirmed. Don't

When the arrival timing of the selection bar 12 to the weft insertion position is far from the set arrival timing θ3, the voltage adjustment circuit 34 outputs an alarm activation signal to the alarm device 43. The alarm device 43 issues an alarm when an alarm activation signal is input. The reason why the arrival timing of the selection bar 12 at the weft insertion position deviates largely from the set arrival timing θ3 is that the rotary solenoid 20 is abnormal, or the above-described low assembly accuracy of the power transmission system,
There is wear.

The following effects can be obtained in this embodiment. (1) The voltage adjustment circuit 34 corrects the reference positive voltage based on the electric signal obtained from the light receiver 29 constituting the position detection means and the loom rotation angle information obtained from the rotary encoder 41. The configuration in which the predetermined upper and lower positions of the selection bar 12 are directly confirmed to correct the reference voltage enables highly accurate timing control of reaching the subsequent weft insertion position of the selection bar 12 which is an operation control target. It is possible to prevent the weft catching mistakes caused by the rapier head 11 for use. (2) The configuration in which the alarm device 43 is activated based on the detection of a large difference between the actual arrival timing of the selection bar 12 to the weft insertion position and the set arrival timing is such that the rotary solenoid 20 or the selection bar 12 is driven. Enables understanding of transmission system abnormalities. (3) In order to detect the rotation angles of the rotary solenoids 20 to 23, angle detectors are required for the number of rotary solenoids. The projector 28 according to the positions of the tips of the plurality of selection bars 12 to 15 at the weft insertion position.
In the configuration in which the detection area of the position detection means including the light receiver 29 is set, any of the plurality of selection bars 12 to 15 arranged at the weft insertion position can be detected by the single position detection means. Therefore, the weft selection device is simplified and the cost is reduced. (4) The grasp of the input start timing of the electric signal can contribute to the next highly accurate arrival timing control of the selection bar 12 to the weft insertion position.

Next, a second embodiment of FIG. 5 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. In this embodiment, the positions of the tips of the selection bars 12 to 15 arranged at the standby position are aligned slightly above the straight line L2. A light projector 44 and a light receiver 45 are arranged on the straight line L2 so as to face each other. The light projected from the projector 44 runs on the straight line L2,
The position detecting means including the light receiver 45 has a detection area on the straight line L2. Then, the tips of the plurality of selection bars 12 to 15 which are placed in the standby position and are subjected to operation control are slightly above the straight line L2. Floodlight 4
4, the light receiver 45, which constitutes the position detecting means, converts the received light into an electric signal and outputs it to the excitation timing circuit 47 which constitutes the positive voltage control circuit 46. Selection bar 12-
The light receiver 45 outputs an electric signal when 15 is in the standby position, and does not output an electric signal when the selection bars 12 to 15 are not in the standby position.

The excitation timing circuit 47 grasps the input start timing and the input stop timing of the electric signal based on the loom rotation angle information obtained from the rotary encoder 41. The input start timing of the electric signal is
The timing at which the selection bars 12 to 15 reach the standby position is shown. The input stop timing of the electric signal represents the timing when the selection bars 12 to 15 start moving from the standby position to the weft inserting position. Timing θ4 at which the selection bars 12 to 15 reach the standby position and positive voltage application timing θ
5 is stored in advance in the excitation timing circuit 47. When the detected input start timing is earlier than the set timing θ4, the excitation timing circuit 47 performs the next positive voltage application to the rotary solenoid 20 at the set timing θ5. When the detected input start timing is later than the set timing θ4, the excitation timing circuit 47 performs a correction to delay the next positive voltage application to the rotary solenoid 20 from the set timing θ5. Due to this correction, the next start timing of the selection bar 12 from the standby position to the weft insertion position is delayed,
Contact between selection bars or wefts is avoided.

When the arrival timing of the selection bar 12 to the standby position is far from the set arrival timing θ4, the excitation timing circuit 47 outputs an alarm activation signal to the alarm device 43.

The following effects can be obtained in the second embodiment. (1) The same effect as the first embodiment can be obtained. (2) The configuration in which the alarm device 43 is activated based on the detection of a large difference between the actual arrival timing of the selection bar 12 to the standby position and the set arrival timing is the drive transmission to the rotary solenoid 20 or the selection bar 12. Enables understanding of system abnormalities. (3) In order to detect the rotation angles of the rotary solenoids 20 to 23, angle detectors are required for the number of rotary solenoids. Any of the plurality of selection bars 12 to 15 arranged at the standby position can be used in the configuration in which the position detecting means including the projector 44 and the light receiver 45 detects the positions of the tips of the plurality of selection bars 12 to 15 arranged at the standby position. Can also be detected by a single position detecting means. Therefore, the weft selection device is simplified and the cost is reduced. (4) The grasp of the input stop timing of the electric signal can contribute to the subsequent highly accurate timing control for reaching the weft insertion position of the selection bar 12.

Next, a third embodiment of FIG. 6 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. In this embodiment, the weft Y which is the operation control target
A limit switch 48 that also serves as position defining means for defining the weft insertion positions 1 to Y4 is used. Selection bar 12
When ~ 15 are arranged at the weft inserting position, the weft yarns Y1 to Y4 are arranged at the weft inserting position where they contact the limit switch 48, and the limit switch 48 is turned on. The electric signal representing ON of the limit switch 48 is the voltage adjustment circuit 34.
Then, the voltage adjusting circuit 34 performs the same control as that of the first embodiment based on the input of this electric signal.

The following effects can be obtained in the third embodiment. (1) The same effect as the first embodiment can be obtained. (2) A single limit switch 48 serving as position detecting means
Thus, it is possible to grasp the arrival of all the wefts Y1 to Y4 at the weft insertion position or the departure from the weft insertion position. Therefore, the weft selection device is simplified and the cost is reduced.

In the present invention, a pressure switch, a distance sensor, a potentiometer or the like may be used as the position detecting means for directly detecting the position of the selective body. Further, instead of adjusting the voltage applied to the rotary solenoid, that is, the drive force, the excitation / demagnetization timing of the rotary solenoid, that is, the drive timing may be adjusted.

[0038]

As described above in detail, the present invention is provided with the position detecting means for detecting the presence or absence of the motion control target at least at one position on the movement path of the motion control target of either the selective body or the weft. Since the weft selection device is configured, the weft selection switch for arranging the wefts between the standby position and the weft insertion position is accurately arranged at a position corresponding to the set timing, and weft catch errors, yarn breakage, Problems such as damage can be solved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment.

FIG. 2 is a combination view of a side sectional view of a rotary solenoid and a control block diagram.

FIG. 3 is a graph showing the switching timing of the selection bar between the standby position and the weft inserting position.

FIG. 4 is a timing chart showing voltage application to a rotary solenoid.

FIG. 5 is a combination view of a side sectional view and a control block diagram of the rotary solenoid showing the second embodiment.

FIG. 6 is a combination diagram of a side sectional view and a control block diagram of a rotary solenoid showing a third embodiment.

[Explanation of symbols]

12 to 15 ... Selection bar serving as a selection body, 28, 44 ... Projector constituting position detecting means, 29, 45 ... Photoreceiver constituting position detecting means, 34, 37 ... Voltage adjusting circuit serving as adjusting means, 48 ... Limit switches constituting position detecting means, Y1 to Y4 ... Wefts to be operation-controlled.

Claims (7)

[Claims] 1. A weft selecting device in a loom, comprising a selection body for selecting and arranging wefts from a standby position to a weft insertion position, wherein at least one of the selection body and the weft is on a movement path of an operation control target. A weft selecting device in a loom, which is provided with a position detecting means for detecting an operation control target at a place. 2. An adjusting means for adjusting a driving force or a driving timing of a driving means for driving the selection body, wherein the adjustment means performs the adjustment based on a detection result of an operation control target by the position detecting means. Item 3. A weft selecting device in the loom according to Item 1. 3. The weft selecting device for a loom according to claim 1, wherein the position detecting means detects the presence or absence of the operation control target at the weft inserting position. 4. The position detecting means detects the presence or absence of the operation control target at the standby position.
2. A weft selecting device in the loom according to any one of 1. 5. A weft selecting device in a loom comprising the position detecting means according to claim 3 and the position detecting means according to claim 4. 6. The method according to claim 3, wherein the presence or absence of a plurality of motion control objects at the weft insertion position is detected by using position detecting means having a detection area on a straight line. Weft selection device for weaving machines. 7. The loom according to claim 4, wherein the presence or absence of a plurality of operation control targets at the standby position is detected by using position detection means having a detection area on a straight line. Weft selection device.