JP2711843B2 - Automatic Weft Yarn Recovery System for Weaving Machine and Control Method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic recovery device for normal weft feeding of a non-woven loom and a control method thereof. The present invention relates to an improvement in productivity in a normal weft supply automatic recovery technique in which a weft is drawn from a body and automatically passed through a storage drum and a main nozzle. (Prior art and its problems) Regarding the automatic weft feeding automatic recovery technique for the above-described non-woven loom, there have already been some partially automated ones and some have been proposed as a whole idea. However, there is no concrete implementation of this to the extent practicable. By the way, the above repair work is roughly classified into the following steps. (I) Discharging of the remaining yarn on the storage drum (II) Guiding the yarn from the yarn supply to the storage drum (III) Holding the yarn guided by the storage drum (IV) Preliminary winding (V) Threading the main nozzle As a control method, for example, there is a method disclosed in Japanese Patent Application Laid-Open No. 62-57970, in which a sensor for detecting a yarn break between a yarn feeder and a yarn guide of a storage drum and a sensor between the yarn guide and a main nozzle are provided. And a sensor for detecting the yarn breakage. These sensors are connected to a selection unit via a determination unit. When a signal is output from the sensor due to a yarn break, the determination unit determines where the yarn break has occurred based on a combination of these signals, and outputs an identification signal. Is output. The selection unit selects a corresponding sequence pattern from the storage unit according to the identification signal, and outputs the result to the drive operation unit. Several sequence patterns are stored in the storage unit. For example, when a yarn break occurs between the yarn supplying body and the yarn guide, sequence 1 is selected,
The repair work is automatically performed in the order of (I) → (II) → (III) → (IV) → (V). If a yarn break occurs between the yarn guide and the main nozzle, the sequence 2
Is selected, and the repair work is automatically performed in the order of (I) → (III) → (IV) → (V). In any case, the success or failure of the repair work is confirmed by a sensor disposed downstream of the main nozzle. However, according to the prior art, if a certain sequence is selected and the repair operation fails at a certain stage in the sequence, the process returns to the first stage of the sequence and all the repair operations are performed again. For example, if the repair work fails in the last stage (V) of the sequence 1, all the repair work in the stages (I) to (V) will be repeated. This is an inevitable result of confirming the success or failure of the repair work only with a sensor placed downstream of the main nozzle. For this reason, in the case of the prior art, it is inevitable that waste is increased in terms of time and power, and also from the viewpoint of yarn consumption. (Summary of the Invention) An object of the present invention is to provide a normal weft supply automatic recovery technology for drawing out a weft from a yarn supply body after each stage of repair work and automatically threading the weft through a storage drum and a main nozzle. It is an object of the present invention to reduce the time, power, and yarn consumption required for the repairing operation by performing the yarn feeding recovery by the minimum necessary number of repairing operations. For this reason, in the present invention, an individual sensor is provided for each stage of the repair work, and the success or failure of the work is confirmed. If the operation is successful by the control unit, the process proceeds to the next stage, and if the work is failed, the work is repeated. The main point is to have the work done. According to the control method of the present invention, in the apparatus having the above-described configuration, the success or failure of each stage of the repair operation performed by the unit is confirmed, and then the process proceeds to the next stage of the repair operation. If not, at least the repair work is repeated, and when the number of repetitions exceeds a predetermined limit, progress to the next repair work is prohibited. (Embodiment) If the yarn feed switching unit has a function of guiding a yarn from a new yarn feeder to the storage drum when a yarn break occurs between the yarn feeder and the storage drum as described above, Although it may be of any type, an example disclosed in Japanese Patent Application No. 62-92627 will be described with reference to FIG. This yarn feed switching unit 200 is an example of a sprocket 201,
It has an endless chain 203 that engages with 202, and this chain 203 is provided with pegs 204 at equal distances.
Each of the pegs 204 has a yarn feeder P removably mounted thereon. One of the sprockets (the lower sprocket 202 in the illustrated example) is connected to the control unit via its drive unit 205.
Connected to 300. The control unit 300 is connected to a control mechanism LC of the loom. Further, the yarn guide tube 207 corresponds to the yarn supplying body P at the yarn supplying position (the uppermost position in the illustrated example).
And a yarn guide tube 206 combined with the yarn guide tube 206 so as to be able to advance and retreat in the axial direction. The inner holes of these yarn guide tubes 206 and 207 communicate with the yarn guide G on the storage drum D of the length measuring storage unit RU via the suction mechanism 211. A trumpet-shaped suction cover 208 is provided at the end of the movable yarn guide tube 206 on the yarn feeder P side. Cylinder 209 for yarn guide tube 207
The piston 210 is connected to the yarn guide tube 206. That is, the yarn guide tube 206 advances and retreats with respect to the yarn guide tube 207 in response to the advance and retreat of the piston 210 of the cylinder 209,
Accordingly, the suction cover 208 approaches and separates from the yarn feeder P. A sensor S3 is provided at the end of the yarn introduction tube 206, and a sensor S6 is provided to face the yarn supplying body P at the yarn supplying position. The cylinder 209 and the suction mechanism 211 are both connected to the control unit 300 via the drive unit 212. Next, a repair operation performed by the yarn supply switching unit 200 will be described. The other parts of the loom also perform corresponding operations in connection with the operation of the unit 200, but a description thereof will be omitted here. First, it is assumed that the yarn is being supplied in the state shown in the drawing and that all the yarns from the yarn supplying body P have been pulled out. Then, both the sensors S3 and S6 output a threadless signal. In response to these signals, control unit 300 determines the situation and outputs corresponding command signals to driving units 205 and 212, respectively. Drive part
212 receives this and drives the cylinder 209 to drive the yarn guide tube 206
As a result, the suction cover 208 is separated from the yarn supplying body P. At this time, the drive unit 205 drives the chain 203 to move the new yarn supplying body P to the yarn supplying position. The drive unit 212 further drives the cylinder 209 to bring the suction cover 208 into close engagement with a new yarn supplying body. Next, the suction mechanism 211 operates to transfer the yarn from the new yarn supplying body P to the yarn guide G of the length measuring and storing unit RU via the yarn introduction tubes 206 and 207. It is also assumed that the yarn breaks during the yarn feeding. Then, the sensor S3 outputs a thread absence signal and the sensor S6 outputs a thread existence signal. In response to these signals, control unit 300 determines the situation and outputs a corresponding command signal to drive section 212. The drive unit 212 receives this and drives the suction mechanism 211, and the yarn feeder P
The length measuring storage unit is connected to the yarn via the yarn guide tubes 206 and 207.
Handed over to RU yarn guide G. Next, as the threading unit, any type may be used as long as it has a function of repairing a thread breakage between the length measuring storage unit and the main nozzle as described above, As an example, FIGS. 2 and 3 show a suction unit that holds a yarn to define a path thereof and an insertion unit that captures the yarn held along the path and guides the yarn to a main nozzle. explain. FIG. 2 shows the suction unit 120 of the threading unit. The suction part 120 is a slide holder 121 loosely inserted into the guide bar 2 fixedly supported on an appropriate frame of the loom.
The holder 121 is connected to a piston of a cylinder 128 that extends in the axial direction of a nozzle (main nozzle, the same applies hereinafter) and is fixed to a frame. A cylinder 126 is installed on the holder 121 so as to be directed to the drum peripheral surface. Further, a holder 123 is movably connected to the holder 121 via a guide spindle (not shown), and a piston of a cylinder 126 is connected to an upper surface of the holder 123. Further, a suction tube 124 is fixedly held near the distal end of the holder 123, and a piston of a cylinder 127 similarly fixed to the holder 123 is connected to a cutter mechanism 125 provided on the suction tube 124. In the above configuration, the entire suction unit 120 is driven by the cylinder 128 to move in the nozzle axis direction along the guide bar 2, and is driven by the cylinder 126 to move the suction tube 124 in a direction toward the drum peripheral surface. Driven by the cylinder 127, the cutter mechanism 125 cuts the yarn. Drum D
The sensor S4 faces the area around the drum
A sensor S5 is provided on each of the suction tubes 124 so as to face the inside of the suction tube 124. The above-mentioned cylinders are connected to the control unit 300 via respective drive units (not shown), and the sensors S4 and S5 are directly connected. FIG. 3 shows the insertion portion 130 of the threading unit 100. An upper and lower two guide rails 4 are provided on an appropriate frame of the weaving machine in the axial direction of the nozzle, and a rack 5 is provided above and in parallel with the guide rails 4. A plate cam 6 is also provided between the guide rails 4 in parallel with them. A motor 132 is mounted on a holder 131 disposed so as to straddle the guide rail 4 and the rack 5 from the front, and the holder 131 is connected to the guide rail 4 via wheels 133 provided on the back surface. It is movably engaged. A pinion 134 fixed to the output shaft of the motor 132
Are engaged with the rack 5. A pin 135 fixed to the lower portion of the holder 131 extends in the nozzle axis direction. An insert bracket 136 is loosely inserted into the pin 135, and is supported by a spring (not shown) so that it can swing. A slide bar 137 is mounted on the front surface of the insert bracket 136 via a double speed mechanism so as to be movable in a direction toward the drum peripheral surface, and an insert 138 and a pusher 139 are fixed to a lower end of the slide bar 137. . The insert bracket 136 has a cylinder 1
40 is provided, and its piston is connected to the above-mentioned double speed mechanism. A roller (not shown) is provided on the back surface of the insert bracket 136 and engages with the plate cam 6. In the above configuration, the entire insertion section 130 moves in the nozzle axis direction along the guide rail 4 by being driven by the motor 132, and is further driven by the plate cam 6 with the movement, so that the periphery of the insert bracket 136 is centered on the pin 135. And the insert 138 and the pusher 139 are driven by the cylinder 140 to move in a direction toward the peripheral surface of the drum. Further, sensors S2 and S1 are provided upstream and downstream of the main nozzle N, respectively. The cylinder 140 and the motor 132 are connected to the control unit 300 via respective drive units (not shown), and the sensors S2 and S1 are directly connected to the control unit 300. Next, a repair operation performed by the threading unit 100 will be described. As in the case of the yarn feed switching unit 200 described above, the description of the corresponding operations of the other related parts of the loom is omitted. If a yarn break occurs during weft feeding, the locking pin (not shown) of the storage drum D is advanced toward the peripheral surface of the storage drum D to prevent release of the yarn, and the yarn guide G is pulled by the suction unit. The suction tube 124 stops at a position facing the suction tube 124, and at the same time, the suction tube 124 starts suction. Next, driven by the cylinder 126, the suction pipe 124 advances toward the drum peripheral surface and is wound on the storage drum D, hits the remaining yarn, and increases the yarn tension to facilitate cutting by the cutter mechanism 125. Next, the cutter mechanism 125 operates to cut the remaining yarn, and the cut remaining yarn is sucked by the suction pipe 124 and discharged out of the system. Driven by the cylinder 126 again, the suction tube 124 returns to the initial position. As a result, the yarn is held between the yarn guide G and the suction pipe 124, and this state is detected by the sensor S5. Thus, the processing of the remaining yarn is completed. In this state, the yarn guide G rotates a predetermined number of times and winds the yarn on the storage drum D to form a preliminary winding. Next, driven by the cylinder 140, the pusher 139 descends, and the locking pin abuts on the thread connected between the suction pipes 124, and then descends and then rises, thereby utilizing the thread tension to move the thread to the cutter mechanism 125. invite. Next, driven by the cylinder 128, the suction unit 120 moves to the main nozzle N side while sucking and holding the yarn. During this time, tension is applied to the yarn between the locking pin on the storage drum D side and the suction tube 124, and the yarn is positioned on both sides thereof and a path for being captured by the insertion portion 130 is defined. When the yarn path is thus defined, the insertion section 130
The insert 138 descends to the first stage by being driven by the cylinder 140, and at the same time, is driven by the motor 132 to move the entire insertion portion 130 toward the main nozzle N. As a result, the insert 138 engages the thread defining the path between the locking pin and the suction tube 124. Further, driven by the motor 132, the insert 138 continues to move toward the nozzle N, and with this, the yarn is drawn out from the suction tube 124. The insertion portion 130 further moves toward the nozzle N, and is driven by the cylinder 140 to lower the insert 138 to the position of the nozzle axis in the second stage. As described above, in the control method of the present invention, (I) discharging the remaining yarn on the storage drum (II) guiding the yarn from the yarn supplying body to the storage drum (III) holding the yarn guided by the storage drum (IV) 5) At least one stage of the restoration work of the 5) floor of the threading to the pre-winding (V) main nozzle is performed, and a case where the normal weft supply recovery apparatus shown in FIGS. The outline is shown in FIG. When a yarn break occurs in a certain work unit, a sensor provided in the work unit detects this and outputs a yarn break signal. In response, control unit 300 outputs a corresponding command signal to the operation unit of the work unit, and a certain stage of repair work is performed. The result (success or failure) of this work is detected by a sensor provided in the work unit, and at the same time, the number of work repetitions is counted. If the operation result is successful, the process proceeds to the next stage of the repair operation.
If the operation result is unsuccessful, the counted number of operation repetitions is compared with a predetermined limit number of repetitions, and if within the limit number of repetitions, the repair work of that stage is repeated. If the limit repetition number is exceeded, it is forbidden to repeat the restoring work at that stage any longer, and this state is displayed externally, preferably by an indicator light or the like. The control method of the present invention having the above-described outline will be further described step by step for each restoration work at each stage. FIG. 5 (A) shows a control method when a yarn break occurs between the storage drum D and the main nozzle N. In this case, the yarn breakage is detected by the sensor S2, and in response to this, the I-stage repair work is started by a command from the control unit 300. First, the initial setting of the number of repetitions n is performed, then the remaining yarn on the storage drum is discharged, and the number of repetitions n is counted. The success or failure of the work is detected by the sensor S4, and if the work is successful, the system prepares for the next stage of repair work. In the case of failure, the counted number of repetitions n is compared with the limit number of repetitions N1, and if it is within the limit number of repetitions, the repair work of the stage I is repeated. If the limit is exceeded, further repetitions are prohibited. When a thread break occurs between the yarn supplying body P and the storage drum D (detected by the sensor S3), the remaining yarn is discharged in the same manner. The thread that is running is simultaneously discharged by the suction pipe 124. FIG. 5B shows a control method when a yarn break occurs between the yarn supplying body P and the storage drum D. In this case, the yarn breakage is detected by the sensor S3, and in response to this, the repair work of the second stage is started by a command of the control unit 300. First, the initial setting of the number of repetitions n is performed, then the yarn is guided from the yarn supplying body to the storage drum, and the number of repetitions n is counted. The success or failure of the work is detected by the sensor S3. In the case of failure, the counted number of repetitions n is compared with the limit number of repetitions N2, and if it is within the limit number of repetitions, the repair work of the stage II is repeated. If the limit is exceeded,
Further repetitions are prohibited. FIG. 5 (C) shows a control method related to the third-stage repair work, that is, the holding of the yarn guided to the storage drum D. With the above-described process, the restoration work of the third stage is started by the command of the control unit 300. First, the repetition number n
Then, the yarn guided on the storage drum via the yarn introduction tube 207 is captured and held by the suction tube 124, and the number of repetitions n is performed. Sensor of success or failure of work
S5 detects and, if successful, prepares for the next stage of repair work. In the case of failure, the counted number of repetitions n and the limit number of repetitions N3
Are performed, and if the number of repetitions is within the limit number of repetitions, the repair work of the third stage is repeated. If the limit is exceeded, further repetitions are prohibited. FIG. 5 (D) shows a control method relating to the repair work in the fourth stage, that is, the preliminary winding. With the above-described process, the restoration work of the fourth stage is started by a command from the control unit 300. First, the initial setting of the number of repetitions n is performed, then preliminary winding is performed, and the number of repetitions n is counted. The success or failure of the work is detected by the sensor S4. In the case of failure, the counted number of repetitions n is compared with the limit number of repetitions N4, and if the number exceeds the limit number of repetitions, further repetitions are prohibited. If it is within the limit number of repetitions, the operation proceeds to the stage I operation, and the above-described process is repeated. If the stage I work is successful within the limit number of repetitions, proceed to the stage III work. If the work of the stage III is successful within the limit number of repetitions, the preliminary winding of the stage IV is performed. In the repair work of the preliminary winding in the fourth stage,
The sensor S4 detects the operation failure, and does not simply repeat the repair work of the preliminary winding, but also intervenes the repair work of discharging the residual yarn on the storage drum in the first stage and holding the yarn in the third stage. The repair work of the spare volume is repeated.
This is because the yarn is entangled and cut on the drum or the yarn comes off from the suction pipe 124 as a cause of the failure of the preliminary winding operation. This is because repetition is not an effective solution. FIG. 5 (E) shows a control method relating to the repair work in the fifth stage, that is, threading. With the above-described progress, the repair work in the V-th stage is started according to a command from the control unit 300. First, the initial setting of the number of repetitions n is performed, then threading is performed, and the number of repetitions n is counted. The success or failure of the operation is detected by the sensor S1, and if the operation is successful, the process shifts to automatic restart. In the case of failure, the counted number of repetitions n is compared with the limit number of repetitions N5. If the number exceeds the limit number of repetitions, further repetitions are prohibited. If it is within the limit number of repetitions, the operation proceeds to the stage I operation, and the above-described process is repeated. If the stage I work is successful within the limit number of repetitions, proceed to the stage III work. If the work of the stage III is successful within the limit number of repetitions, the preliminary winding of the stage IV is performed. At the time of the threading restoration work at the fifth stage,
As in the case of the fourth stage, the repair operation of the first, third, and fourth stages is interposed therebetween, instead of simply repeating the repair operation of the threading. The reason for this is that, like the above, cutting of the thread or pulling out of the thread from the suction tube 124 is considered. (Effects of the Invention) As is apparent from the above, according to the present invention, when a yarn break occurs in the path from the yarn supplying body to the main nozzle during weft feeding to the main nozzle of the non-woven loom, the yarn is repaired at each stage. In addition to performing the work automatically, confirming the success or failure of the work, if the repair work at any stage fails, it is only necessary to repeat the minimum required number of repair work, so Waste can be largely avoided both dynamically and in terms of yarn consumption.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an example of a yarn feeding switching unit of the apparatus of the present invention, FIGS. 2 and 3 are side views showing an example of the threading unit, and FIG. 5 (A) to 5 (E) are flowcharts showing an embodiment of the repair work at each stage. 200: Thread feed switching unit 100: Threading unit 120: Suction unit 130: Insertion unit 300: Control unit RU: Side length storage unit P: Thread feeders S1 to S6: Sensor

Claims (1)

(57) [Claims] This is a model that pulls out the weft from the yarn supply body after each stage of the repair work and automatically passes the yarn through the storage drum and the main nozzle.A sensor that checks the success or failure of the work at each stage of the above repair work is provided. After the completion of each stage of work, the sensor corresponding to the work is checked for success or failure, if it succeeds, it proceeds to the next stage of repair work, if it fails, the work is repeated An automatic recovery device for normal weft feeding of a non-woven loom, characterized by having a control unit for performing the control. 2. 2. The apparatus according to claim 1, wherein when the number of work repetitions in the same stage exceeds the limit number of repetitions, the repair work in that stage is further prohibited. 3. When performing at least one of the following repair operations, the following operations are required: (I) discharge of the remaining yarn on the storage drum (II) yarn guide from the yarn supply body to the storage drum (III) guide to the storage drum (IV) Pre-winding (V) Main nozzle threading Check the success or failure of the repair work at each stage. At the same time, count the number of work repetitions. If the work is successful, proceed to the next stage. Proceed to the repair work, if the work is unsuccessful, compare the counted number of work repetitions with the predetermined limit number of repeats, and if it is within the limit number of repeats, repeat the repair work at least at that stage, A control method for a normal weft feeding automatic recovery device of a non-woven loom, wherein prohibiting further repetition of the repair work at that stage if the number of repetitions exceeds a limit repetition number.