JP3377598B2 - Weft processing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method for discharging a weft yarn on a drum when a yarn breaks in a drum type length measuring and storing device. 2. Description of the Related Art Japanese Patent Laying-Open No. 3-104965 relates to a "weft threading device" and discloses a device for discharging a wound thread on a drum in a weft threading step. According to the device, when a yarn break occurs between the yarn supplying body and the length measuring and storing device, the weft insertion nozzle (suction means) and the blow-up nozzle are operated, and the locking pin is retracted to remove the defective yarn. The yarn wound on the drum is discharged to the device. Then, when the sensor in the defective yarn removing device detects that there is no yarn, it is determined that the discharge is completed, and the injection of the weft insertion nozzle and the blowing nozzle is stopped. [0003] Also, Japanese Patent Application Laid-Open No. 4-108139 discloses that
The present invention relates to a "yarn supply device in a jet loom" and discloses means for discharging a wound yarn on a drum. According to the discharge means, when a yarn break occurs between the weft insertion guide nozzle and the weft insertion nozzle or between the length measuring and storing device and the yarn supplying body, the weft yarn separating blow nozzle (suction means), the weft insertion, and the like. By operating the blow nozzle for use and retracting the locking pin, after a lapse of a predetermined time, both blow nozzles are stopped and the locking pin is advanced to discharge the wound yarn on the drum. However, the above two discharge means have the following common problems. That is, in the discharging step,
Regardless of the type of weft yarn to be processed, the following problems occur because the locking pin is continuously retracted and the weft yarn is continuously supplied to the weft insertion nozzle and blow nozzle as suction means. I do. When the weft to be discharged is a high-twisted filament, when the weft wound on the drum is unwound from the drum, the weft shrinks and becomes entangled with an adjacent weft, and a plurality of wound wefts are unwound at the same time. An operation failure occurs due to the presence of the entangled portion. Also, when the weft to be treated is a long-haired span or wool, a similar problem occurs because the adjacent weft and fluff are entangled. That is, when the weft is unwound in the discharging process, the yarn is broken, so that the winding tension on the drum is lower than the tension when the weft is unwound during weaving, and the weft is adjacent to the weft. This is because it is easy to interfere with In order to solve the above-mentioned problem, it is conceivable to intermittently retract the locking pin and continuously operate the suction means during supply, regardless of the type of weft thread. However, in this solution, the same discharge process is performed for a type of weft yarn that does not cause a problem even if it is unwound continuously, so that the processing time of the weft yarn becomes unnecessarily long. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to stop the loom when a yarn break occurs between the yarn supplying body and the weft insertion nozzle, and perform the weft yarn on the drum which is performed thereafter. By reliably discharging the remaining yarn, more specifically, by reliably performing the operation of supplying the weft wound around the drum of the drum type length measuring and storing device to the suction means provided on the downstream side in the weft insertion direction. is there. [0008] In view of the above-mentioned object, the present invention provides a method for stopping a loom when a yarn breakage occurs between a yarn feeder and a weft insertion nozzle, and thereafter, a drum type length measuring method. In the weft yarn processing method of performing the process of discharging the remaining yarn on the drum by retracting the locking pin of the storage device and operating the suction means provided on the downstream side in the weft insertion direction, A discharging step for continuously retracting the locking pin and a discharging step for intermittently retracting the locking pin during discharging are set in advance and executed according to the type of weft to be discharged. The discharge process to be performed is changed. Here, as the suction means, in addition to the weft insertion nozzle, a dedicated suction nozzle provided separately therefrom is used. Further, as an example of control for intermittently retracting the locking pin, as to the forward / backward movement of the locking pin, the locking pin is moved forward every time a predetermined number of turns is unwound, and the locking pin is retracted after a predetermined time has elapsed, or Means for controlling both the backward and forward movement of the pin with time are conceivable. As a method of repeating the above-mentioned one-way movement, the one-way movement is performed for a predetermined time, a predetermined number of times,
Alternatively, a repetition method such as repetition until the discharge is completed can be considered. Furthermore, as a specific example for changing the discharging process, corresponding to the type of the weft, it is manually selected, automatically selected, and the type of the weft being set is automatically determined by a sensor or the like. Means such as selection can be considered. When the yarn breakage occurs, the loom is stopped, and a discharge process is performed according to the type of the weft discharged. That is, depending on the type of the weft yarn, for example, in the case of a filament with a weak twist or a short span of the bristle feet, the suction means is operated while continuously retracting the locking pin to suction the weft wound on the drum. A discharge step for continuously feeding the means is performed. In the case of high twist filaments or long spans of wool, or wool,
By operating the suction means while intermittently retracting the locking pin, a discharge step of intermittently supplying the weft wound around the drum to the suction means little by little, for example, one by one is executed. As described above, since a plurality of discharge processes are set in advance, and the most appropriate discharge process is selectively executed according to the type of the weft to be discharged, the discharge of the weft can be reliably performed. In this embodiment, a discharging process is selected by a manual switch, and two discharging processes are set in a memory of a weft processing control device. This is an example in which a discharging step is read from a memory and executed. In the discharging step of intermittently retracting the locking pin, one forward retreat is controlled by time, and this is repeated a predetermined number of times. Further, in the case of the discharging step of continuously retracting the locking pin, the retracting operation is controlled by time. The wound yarn on the drum is discharged by a dedicated suction nozzle. FIGS. 1 to 3 show the structure of the main part when the weft processing method of the present invention is carried out. This embodiment is assembled on the premise that the apparatus of the invention disclosed in Japanese Patent Application Laid-Open No. 3-104965 is used. In these figures, the weft yarn 1 is composed of a thin plate tensor 30 and a yarn feed nozzle 3 from one of the two yarn feeders 2.
1 is drawn into the winding yarn guide 4 of the drum type length measuring and storing device 3. The winding yarn guide 4 is rotated at a predetermined speed by a drive motor 5, and measures the length by winding the weft thread 1 around a fixed drum 6. During the length measurement, the locking pin 7 is driven by the operation device 8 and advances to the outer peripheral surface of the drum 6 to lock the weft 1. The weft yarn 1 on the downstream side of the drum 6 reaches the inside of the weft insertion nozzle 10. When the operating device 8 retreats the locking pin 7 at the weft insertion timing, the weft yarn 1 is unwound at the drum 6 and the weft insertion state is set. At this time, since the pressure fluid source 11 and the pressure control valve 12 supply the pressurized fluid to the inside of the weft insertion nozzle 10, the weft insertion nozzle 10 directs the weft insertion fluid into the warp yarn opening 24. By injecting, weft 1
We carry out horizontal insertion. When a yarn break occurs between the yarn supplying body 2 and the length measuring and storing device 3, a yarn break detection sensor 29 detects the yarn break at, for example, the entrance of the winding yarn guide 4, and outputs a yarn break detection signal. And outputs this to the loom controller 28 of FIG. After stopping the loom, the loom control device 28 sends a processing command signal to the weft processing control device 50. The weft processing controller 50 includes a control CPU connected to a memory 51 and manual switches 53 and 54.
52, a sensor 13 for detecting thread breakage, a sensor 29 for detecting thread breakage on the input side of the weft insertion nozzle 10, a sensor 20 for yarn confirmation of the yarn processing device 18, and a loom control device on the input side. 28, and on the output side, the drive motor 5, the actuator 23, the drive units of the electric cutters 9, 43, the pressure control valve 12, the control valve 16a,
16b, 16c, 16d, 16e, 16f, operating device 8,
Solens 33a and 33b for adjusting the tensioner and thread guide 4
It is connected to an air cylinder 42 for one operation, a winding motor 25 of the yarn processing device 18, an air cylinder 26, and the like. The yarn processing device 18 is used for pulling out the defective weft yarn 1 from the inside of the opening 24 and for discharging the weft yarn 1 remaining on the drum 6 as shown in FIG. As described above, a pair of rotating bodies 34 and 35 rotatable inside the casing 27 are provided, and the weft 1 guided to the inside of the casing 27 from the trumpet-shaped guide 19 by the venturi suction operation of the nozzle 38 is rotated in one direction. Between the rotating body 34 and the other rotating body 34 which can be advanced and retracted by the air cylinder 26, and the winding motor 2
5, the weft 1 is wound around the outer circumferences of both the rotating bodies 34 and 35, and the weft 1 is taken off. After the completion of the pick-up, when the other rotating body 35 retreats,
The coiled weft 1 is separated from the conical surface of the other rotating body 35 and enters the inside of the discharge hole 37 of the rotating shaft 36 of the one rotating body 34, where it receives the jet airflow from the nozzle 38,
It is discharged into a box. When the weft processing control device 50 receives the processing command signal from the loom control device 28, the weft processing control device 50 responds to the input setting state of the manual switches 53 and 54, and
The most suitable discharging operation is performed for the type of the weft thread 1 wound on the sheet. 4 and 5 show a discharging step (a discharging step-1 and a discharging step-2) for discharging the weft 1 wound on the drum 6. In the discharging step-1, that is, when the continuous unwinding operation is performed with the weft 1 such as a weakly twisted filament and a short span of hair, the suction nozzle 14 is controlled by the control valve 16b to the pressure fluid source 15 Performs a venturi suction operation by pressure air injection from the air cylinder 42, and the yarn guide 41 advances by the operation of the air cylinder 42, and the weft yarn 1 is drawn into the suction nozzle 1.
4 to the suction port. Here, by the operation of the pressure control valve 12, the continuous injection of the weft insertion nozzle 10 is stopped, and after a predetermined time has elapsed, the yarn guide 41 returns to the original position. Next, the remaining weft thread 1 is unwound on the drum 6 by retreating the locking pin 7 for 3 seconds, for example, and thereafter, is discharged from the upper surface of the drum 6. Here, while the suction nozzle 14 stops the suction operation, the continuous injection of the weft insertion nozzle 10 is restarted. Next, for preliminary winding, the winding yarn guide 4 is positioned at a predetermined rotation position, for example, a rotation position facing the suction nozzle 14 by the rotation angle of the drive motor 5. The discharging step-2, that is, when the intermittent unwinding operation is performed according to the type of weft yarn such as a strongly twisted filament, a long bristle span, and wool, is substantially the same as the discharging step-1. However, instead of the continuous unwinding operation of retracting the locking pin 7 for 3 seconds, the operation of retracting the locking pin 7 for 0.1 second and advancing it for 1 second, for example, is repeated about 10 times. By this, weft 1
Are unwound one by one from the top of the drum 6. Thereafter, a processing step of drawing out the weft yarn 1 from the spare yarn feeder 2 and passing it through the suction nozzle 14 is performed. FIG. 6 shows a processing step of passing a thread. In FIG. 5, first, the suction nozzle 14 starts the suction operation, and the solenoid 3
3b, the thin plate tensor 30 opens the weft yarn 1 from the spare yarn supplying body 2, the control valve 16d causes the spare side yarn supplying nozzle 31 to perform an injection operation, and the control valve 16a controls the guide nozzle. 17 performs a guiding operation. Then, after 0.5 seconds, the thin plate tensor 30 holds the yarn, and the yarn supply nozzle 31 stops the injection operation. By these guiding operations, the weft 1 is wound around the wound yarn guide 4.
6 enters the inside of the suction nozzle 14 through FIG.
State. Here, the sensor 20 detects the weft thread 1 and confirms that the weft thread 1 is guided inside the guide 19. FIGS. 7 and 8 show a processing step of passing the weft yarn 1 through the weft insertion nozzle 10 after the preliminary winding. The suction nozzle 14 continues to operate.
Is in the advanced state. Here, when the winding yarn guide 4 rotates three times, for example, for three preliminary windings, the weft 1 is stored in the drum 6 for three windings. Thereafter, the yarn guide 21 is driven and rotated by the rotation shaft 22 of the rotary actuator 23 to guide the weft 1 to the weft insertion nozzle 10. Next, the weft insertion nozzle 10 starts the injection operation at a pressure larger than the normal injection by the pressure control valve 12, so that the guided weft 1 enters the inside of the weft insertion nozzle 10 and is checked by the sensor 13. Then, the cutter 9 operates to cut the weft thread 1 between the suction nozzle 14 and the weft insertion nozzle 10, and then the thread guide 21 returns to the original position. Here, the suction operation of the suction nozzle 14 stops. Next, the blow-up nozzle 32 is operated, and the leading end of the weft thread 1 coming out of the weft insertion nozzle 10 is guided into the guide 19. This state is confirmed by the sensor 20. Thereafter, the thin plate tensor 30 opens the weft yarn 1, and the nozzle 38 of the yarn processing device 18 starts the suction operation by opening the control valve 16e. At this time, the locking pin 7 is retracted for one second as shown in FIG. Locking pin 7
Is advanced, the weft insertion nozzle 10 always returns to jetting, and the winding yarn guide 4 rotates, for example, five times, so that the weft yarn 1 is wound on the drum 6. After this,
After the thin plate tensor 30 grips the weft yarn 1 and the blow-up nozzle 32 stops, the cutter 43 operates to cut the weft yarn 1 at the leading end position of the weft insertion nozzle 10. Finally, the injection of the nozzle 38 of the yarn processing device 18 stops, and the suction operation stops. This completes the threading. Next, the length measuring storage device 3 and the weft insertion nozzle 1
When a yarn break occurs between 0 and 0, the sensor 13 detects the yarn break, generates a yarn break detection signal, and outputs this to the loom controller 28. After stopping the loom, the loom control device 28 outputs a processing command signal to the weft processing control device 50. Here, the weft processing control device 50 executes a discharging process. FIG. 9 shows the weft 1 wound on the drum 6.
Discharge process (discharge process-1 and discharge process-2)
Is shown. When the continuous unwinding operation is performed in the discharging step-1, that is, the yarn type such as a weakly twisted filament and a short span of the hair, the thin plate tensor 30 opens the weft yarn 1 by the solenoid 33a. After the winding yarn guide 4 is positioned at the rotation position facing the suction nozzle 14, the suction nozzle 14 starts the suction operation. The guide nozzle 17 operates, for example, for 0.5 seconds, and then stops. At this time, since the locking pin 7 is moving forward, the weft thread 1 is sent out from the winding yarn guide 4, forms a loop, reaches the suction nozzle 14, and is held there. With the stop of the guide nozzle 17, the thin plate tensor 30 grips the weft thread 1. Next, the locking pin 7 is continuously retracted, for example, for 3 seconds, and then advanced. by this,
The weft yarn 1 is unwound from the drum 6, formed into a hairpin shape, and guided inside the suction nozzle 14. Discharging step-2, ie, the discharging step when an intermittent unwinding operation is performed for a yarn type such as a strongly twisted filament, a long hairy span, or wool.
1 in place of the continuous unwinding operation at 1
The intermittent unwinding operation of retreating for one second and moving forward for one second is repeated, for example, ten times. Thereby, the weft 1 is unwound one by one. Thereafter, a processing step for threading is performed. However, the target yarn feeder 2 is not the spare yarn feeder 2 but the used yarn feeder 2. [Modification] The above-described embodiment can be replaced with a unit having a similar function for each part. As described above, instead of the dedicated suction nozzle 14, the horizontal insertion nozzle 10 can be used as the suction means. At this time, it is necessary that the outlet of the winding yarn guide 4 be formed so as to be directed to the inlet of the weft insertion nozzle 10. As an example of control for intermittently retracting the locking pin 7, regarding the one-way operation of the locking pin 7, (1) a predetermined number of windings, for example, one unwinding is provided in front of the drum 6 during the retreating. When detected by the unwinding sensor, the locking pin 7 is moved forward, and after a lapse of a predetermined time, the locking pin 7 is retracted, (2)
Control both the retraction and advancement of the locking pin 7 at appropriate times. As the method of repeating the one-way operation, the one-way operation is repeated (1) for a predetermined time.
Specific examples such as (2) repeating a predetermined number of times, and (3) repeating until a sensor provided on the downstream side detects no weft, that is, completion of discharge, are considered. As a specific example for changing the discharge process, in addition to manual selection, when the weaving conditions are input, the discharge process corresponding to the set weft yarn type is automatically set by the weft yarn processing control device 50. You may choose. That is, when weaving conditions including the weft type are input and set to the loom controller 28, a code corresponding to the type of the weft is output from the loom controller 28 to the weft process controller 50, and the weft process controller 50 responds. Automatically select the discharge process to be performed. In addition, a sensor for determining the type of the weft thread 1 being set is provided in the weft conveying path, and the weft processing controller 5 is provided based on the result of the determination by the sensor.
For example, a process corresponding to 0 is automatically selected. Furthermore, three discharge processes are set (1 for continuous unwinding and intermittent unwinding).
(Rewind 0.1 seconds, advance 10 seconds 10 times and unwind one roll at a time.), 2 of intermittent unwinding (Reverse 0.2 seconds, advance 5 times 1 second and unwind two volumes at a time. May be selected from these three. In the discharge of the embodiment, a dedicated suction nozzle 14 is used.
Is used as the suction means, but this method may be applied to a discharge device using the weft insertion nozzle 10 as the suction means. For example, the description will be made based on the discharge of the above-described embodiment.
When the yarn breakage occurs between the nozzle and the length measuring and storing device 3, the weft insertion nozzle 10 is always operated at a pressure larger than the injection, and the blowing nozzle 32 and the yarn processing device 1
8, the weft thread 1 wound around the drum 6 is discharged by continuously or intermittently retracting the locking pin 7 by operating the suction function of the suction pin 8.
The method of the invention can be applied. In the above embodiment, the suction nozzles 14 having different axial positions with respect to the weft insertion nozzles 10 are provided, but the suction nozzles 14 are arranged on the same axis as the weft insertion nozzles 10.
The method of the present invention can also be applied to a discharge structure having the following. FIG. 10 shows this state. here,
The weft insertion nozzle 10 is provided on the center line of the drum 6, and the tip of the wound yarn guide 4 is directed to the center of the inlet of the suction nozzle 14. The discharging process when a yarn break occurs between the yarn supplying body 2 and the length measuring and storing device 3 is as follows. First, the operation from the detection of a thread break to the output of a processing command is the same as in the above-described embodiment. Next, in the discharging step of the weft 1 wound on the drum 6, as shown in FIG. 10, the suction nozzle 44 is operated by the control valve 39, and the continuous injection of the weft insertion nozzle 10 is performed by the pressure control valve 12. Stop. Thereafter, the locking pin 7 is continuously retracted, or intermittently repeats the retreating operation, so that the drum 6
The remaining weft 1 is discharged, and after a lapse of a predetermined time,
The suction operation of the suction nozzle 44 stops. Then, the continuous injection of the weft insertion nozzle 10 is in a restarted state. In this way, the weft yarn 1 is discharged. In the processing step of passing the weft yarn 1 from the spare yarn feeder 2 to the suction nozzle 44, the suction nozzle 44 is operated by the control valve 39, the thin plate tensor 30 is released, and the yarn supply nozzle 31 is operated. Further, the guide nozzle 17 performs an injection operation by the control valve 16a. As a result, the thin plate tensor 30 grips the weft yarn 1, and in this state, the injection operation of the yarn supply nozzle 31 stops. After a lapse of a predetermined time, the operations of the suction nozzle 44 and the guide nozzle 17 are stopped, and the cutter 45 is operated.
The weft thread 1 is cut at the position 5. After the weft yarn 1 is pre-wound on the drum 6, in the processing step of passing the weft yarn 1 through the weft insertion nozzle 10, first, the locking pin 7 advances, and the thin plate tensor 30 is set to the yarn released state. Next, the winding yarn guide 4 makes three revolutions, for example, for three preliminary windings. Thereby, the weft 1 is preliminarily wound three times on the drum 6. Next, the operation control valve 39 of the control valves 46 and 47
When the operation is stopped, the suction nozzle 44 performs the guiding operation in the threading direction, the operation of the pressure control valve 12 causes the weft insertion nozzle 10 to start the injection operation at a pressure larger than the normal injection, and the blowing nozzle 32 also operates. I do. By the operation of the control valve 16e, the nozzle 38 of the yarn processing device 18 performs a jetting operation to start suction, the locking pin 7 retreats for one second, and the weft insertion nozzle 10 returns to the normal jetting. Next, with the locking pin 7 advanced, the winding yarn guide 4
After rotation, the thin plate tensor 30 grips the weft yarn 1, the operation of the blow-up nozzle 32 stops, and the weft yarn 1 is cut at that position by the cutter 40. Finally, the injection of the nozzle 38 of the yarn processing device 18 stops, and the suction operation stops. Thus, the threading is completed. When a yarn break occurs between the length measuring and storing device 3 and the weft insertion nozzle 10, the process from the detection of the yarn break to the output of the processing command is the same as in the above embodiment. Then, in the discharging process of the weft 1 wound around the drum 6, the thin plate tensor 3
0 is in the yarn release state, the suction nozzle 44 starts the suction operation by the control valve 39, the guide nozzle 17 is operated, and the weft 1 is transferred from the wound yarn guide 4 to the suction nozzle 44.
To retreat the locking pin 7 continuously or intermittently. Thereafter, after a lapse of a predetermined time, the suction nozzle 44 and the guide nozzle 17 are stopped, and the thin plate tensor 30 is
To grip. Thereafter, the processing steps are performed. However, the target yarn feeder 2 is not a spare yarn feeder 2,
The yarn feeder 2 is used. In addition to the processing steps described in the above embodiment, another step 'is set up, and when processing a high twist yarn,
Step 'can be selected and executed by, for example, a manual switch. That is, in the case of a strong twist yarn, even if the weft yarn 1 is simply guided into the yarn processing device 18 in the processing step, when the blowing nozzle 32 is stopped thereafter, the weft yarn 1
Shrinks and comes off from the yarn processing device 18. Therefore,
In the step ', the number of preliminary windings is set to four in order to increase the number of windings of the weft yarn 1 unwound from the drum 6 during threading. Before stopping the blow-up nozzle 32, the weft yarn 1 was gripped in the yarn processing device 18. In detail, in the process', the number of preliminary windings is four,
0 is returned to continuous injection, and then the air cylinder 26 is operated to hold the weft 1; after the cutting operation of the cutter 40, the air cylinder 26 is deactivated and the weft 1 is released. Different from the process. At this time, it is preferable to set the retracting time of the locking pin longer than the process time so that the four wefts 1 are unwound from the drum 6 reliably. According to the present invention, a plurality of discharge steps are set in advance, and the optimum discharge step is executed according to the type of the weft to be discharged. The weft discharge operation can be performed more reliably without lengthening the length.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic illustration of an apparatus for performing the method of the present invention. FIG. 2 is a block diagram of a connection relationship between sensors and control elements connected to a weft processing control device. FIG. 3 is a sectional view of a main part inside the yarn processing device. FIG. 4 is an explanatory diagram of a state in which a weft yarn is guided to an inlet of a suction nozzle. FIG. 5 is an explanatory view showing a state in which a weft yarn is guided from a spare side yarn supplying body to a winding yarn guide. FIG. 6 is an explanatory view of a state where a weft yarn is delivered from a winding yarn guide to a suction nozzle. FIG. 7 is an explanatory diagram of a state in which a weft yarn is guided to an inlet side of a weft insertion nozzle. FIG. 8 is an explanatory diagram of a state in which the weft yarn of the weft insertion nozzle is guided to the yarn processing device. FIG. 9 is an explanatory diagram of a state in which a weft is fed from a winding yarn guide and delivered to a suction nozzle. FIG. 10 is an explanatory diagram showing a state of yarn processing according to another embodiment. DESCRIPTION OF SYMBOLS 1 Weft yarn 2 Feeder 3 Measurement storage device 4 Winding yarn guide 5 Drive motor 6 Drum 7 Lock pin 8 Operating device 10 Weft insertion nozzle 14 Suction nozzle 18 Thread processing device 28 Loom control device 50 Weft processing Control device

Claims (1)

(57) [Claims] [Claim 1] When a yarn break occurs between a yarn supplying body and a weft insertion nozzle, a loom is stopped, and then a drum type length measuring and storing device is locked. With the pin retracted,
In a weft yarn processing method in which a suction means provided on the downstream side in the weft insertion direction is operated to discharge the remaining yarn on the drum, the discharging step includes continuously retracting the locking pin during discharging as the discharging step. A discharge step of intermittently retracting the locking pin during discharge, which is set in advance, and the discharge step to be executed is changed according to the type of the weft to be discharged. Weft processing method.