JP3185968B2 - Weft discharge device of air jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air jet loom, in which a weft (defective yarn) having a weft insertion error or a weft inserted before the weft insertion is woven into a woven fabric. The present invention relates to a device for discharging weft yarn.

[0002]

2. Description of the Related Art As one of devices for discharging a weft in which a weft insertion error has occurred, when a weft insertion error occurs, the defective yarn is kept connected to a weft in a main nozzle, and the weft is removed. There is a device for winding and discharging the yarn on the yarn supply side (Japanese Patent Application Laid-Open No. 61-245339). However, in this device, it is impossible to remove the weft that has been properly inserted into the woven fabric and has been cut from the weft in the main nozzle. For this reason, it is not possible to cope with the repairs according to the following a), b) and c).

A) In the case of a weft insertion error such as a ben topic in which the weft is turned back or a show topic in which the weft is not inserted into a predetermined position, uneven portions are already woven into the woven cloth before the weft insertion error occurs. Depending on the driving state, a thick step where the weft density is larger (thicker) than other parts or a cast step where the weft density is smaller (thin) than other parts occurs.
That is, in the case of Ben Topic, two wefts are partially present before weaving due to the weft reversal, and extra weaving is performed by this amount to generate a thick step. Also, in the case of a show topic, since the weft does not exist over the entire weaving width, a portion where no weft is present is not driven, and a run-off occurs.

B) For the purpose of operating the loom continuously for a long time,
When a plurality of yarn feeders are set on a loom in a spliced state, a weft including a seam may be inserted, and in such a case, a thick step is generated due to the influence of the seam as described above.

[0005] c) Weaving may proceed in a state in which weaving has occurred in the woven fabric due to a malfunction of the weft insertion error detector or the warp cut detector.

In each of the above cases a), b) and c), not only the defective yarn but also one or more weft yarns inserted and woven before it must be removed from the woven fabric. For example, in cases a) and b), several wefts that have been driven in before the defective weft must be inserted must also be removed. In the case of c), a plurality of wefts in a region from the pre-weaving to the weave must be sequentially removed while canceling the weaving state of the weft at the pre-weaving position.

[0007] As another technique for removing a weft already cut from a weft in a main nozzle, after a yarn to be removed is spun out, the weft is separated from a weaving yarn by a claw piece and cut into a warp shed. There is an apparatus that removes the paper by using a removing means after the paper is pulled out of the apparatus (Japanese Patent Publication No. 6-99858). However, in this device, the structure of the device itself is very complicated and expensive. Further, since the weft to be removed is hooked on the claw pieces and separated from before weaving, there is a high possibility of a hooking error and the removal operation is uncertain.

As one of other techniques for removing the cut weft yarn from the weft yarn already in the main nozzle, an air flow heading toward the reed after weaving is generated from a separation nozzle arranged on the yarn supply side. Thus, there is a device that separates the weft to be removed from the weaving to be removed from the front of the weaving and discharges the separated defective yarn to the non-feeding side by the airflow jetted from the sub-nozzle (Japanese Patent Application Laid-Open No. 2-221441). However, in this apparatus, since the defective yarn is bent and discharged in a U or V shape opening to the non-yarn supply side, the defective yarn may be caught by the sub-nozzle or the warp yarn and may not be removed. In particular, when the weft is glass fiber, the glass fiber is bent and is easily caught by the sub-nozzle or the warp yarn and cannot be removed in many cases.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to reliably discharge a weft cut from a yarn in a main nozzle by a device having a simple structure.

[0010]

A weft discharging device according to the present invention is characterized in that a weft measured by a length measuring device is inserted into the opening of a warp by means of a weft inserting device including a main nozzle and a plurality of sub-nozzles, and after beating. The present invention is applied to an air jet loom that cuts the weft by a cutter disposed between the main nozzle and a woven cloth end on the yarn supply side. Such a weft discharge device is disposed on the non-feeding side, and operates a separation nozzle that generates an airflow toward the reed after weaving, and operates the separation nozzle and the sub-nozzle after the reverse exit of the loom. The part of the weft opposite to the weft supply side is separated from the weaving side by the ejection of the separation nozzle , and then the part adjacent thereto is gradually weaved from the opposite side to the yarn supply side by the injection of the sub- nozzle. And a control device that is separated from the control device.

When a weft insertion defect occurs or a weaving defect is found, the loom is stopped and reversed, and the weaving opening of the defective yarn to be removed is opened. Thereafter, since air is ejected from the separation nozzle and the sub-nozzle, first, the portion of the defective yarn on the non-feeding side is separated from before weaving by the airflow from the separation nozzle, and thereafter, the defective yarn separated from before weaving is removed. The portion gradually moves to the yarn supply side by the air flow from the separation nozzle and the sub-nozzle. For this reason, there is no possibility that the defective yarn is curved in a U or V shape.
When the defective yarn is completely separated from before weaving, the defective yarn is blown off to the non-feeding side and finally discharged to the non-feeding side.

According to the present invention, the separating nozzle for generating the air flow toward the reed after the weaving is arranged on the non-yarn feeding side, and after the reverse rotation opening of the loom, the separating nozzle and the sub-nozzle are operated to remove the weft yarn. Since the yarn is gradually pulled away from the weaving side from the non-yarn feeding side toward the yarn feeding side, the defective yarn is discharged to the non-yarn feeding side without being curved in a U or V shape, and the sub nozzle and There is no risk of getting caught on the warp. Therefore, the defective yarn can be reliably discharged in spite of the simple structure of the device.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, an air-jet loom 10 includes a main nozzle 14 of a weft insertion device for inserting a weft 12 therein.
The weft 12 is inserted into the opening of the warp 18 by ejecting compressed air from the plurality of sub-nozzles 16 of the weft insertion device while jetting the compressed air.

The weft yarn 12 is drawn out of the yarn supplying body 20 and guided to a length measuring and storing device 22. The weft yarn of a length necessary for at least one weft insertion is previously stored in the length measuring and storing device 22. It is stored. The leading end of the weft 12 is inserted through the main nozzle 14. FIG. 1 shows a yarn receiver 2
0a is consumed, and the weft of the yarn feeder and the yarn feeder 2 arranged in the yarn receiver 20a are consumed.
The state where the seam 60 portion with the weft 0 is inserted into the weft is shown.

At the time of weft insertion, the weft yarn 12 for one pick is unwound from the locking pin of the length measuring and storing device 22 for a predetermined period, and the opening of the warp yarn 18 is performed by jetting compressed air from the main nozzle 14 and the sub nozzle 16. It is inserted in weft. The inserted weft yarn 12 is beaten by a reed 24 before weaving, and is cut by a cutter 28 disposed between the main nozzle 14 and the woven fabric 26 on the yarn supply side.

The compressed air is supplied from a compressed air source 30 to the solenoid valve 3.
2 to the main nozzle 14 via the flow path 34 and the electromagnetic valve 36 and the flow path 3 from the compressed air source 30.
8, and is supplied to the sub nozzle 16. At the time of weft insertion, the solenoid valves 32 and 36 are driven by the loom control device 40 via the weft discharge control device 42 to supply the compressed air from the compressed air source 30 to the main nozzle 14 and the sub nozzle 16.

The loom control device 40 receives a detection signal from the feeler 44 disposed on the non-yarn supply side so as to detect that the weft yarn 12 has been inserted into the predetermined position. Signals are exchanged between them, and the rotation of the main shaft 46 is controlled. The rotation angle of the main shaft 46 is
8 and is supplied to the weft discharge control device 42 as an electric signal.

The weft discharge device includes a weft discharge control device 42.
, A separation nozzle 50 and a suction nozzle 52 for sucking a defective yarn. The separating nozzle 50 is arranged on the non-yarn feeding side so as to generate an airflow toward the reed after the weaving, and receives the compressed air of the compressed air source 30 via the electromagnetic valve 54. When discharging the defective yarn, the solenoid valve 54 is driven by the weft discharge control device 42 to supply the compressed air from the compressed air source 30 to the separation nozzle 50.

On the non-yarn supply side, a yarn sensor 56 for detecting that a defective yarn has been sucked by the suction nozzle 52 is provided inside the suction nozzle 52. The weft discharge control device 42 receives the detection signal of the yarn sensor 56 and is connected to a discharge operation start switch 58 for inputting a discharge command of a defective yarn. Switch 5
8 is pressed, the weft discharge control device 42
6, 54 and the suction nozzle 52 are operated a plurality of times in a predetermined order and at a predetermined timing. For this reason, the weft discharge control device 42 includes a setting device for setting the number of times the weft is discharged by the operator.

Since the weft having the seam 60 does not fly normally, the timing at which the tip of the weft is sensed by the feeler 44 is delayed as compared with the case of a normal weft. When the weft having the seam 60 is inserted, the feeler 44 outputs a signal indicating a weft insertion error to the loom controller 40. As a result, the loom control device 40 stops the loom 10, notifies the worker of a weft insertion failure by a lamp, a buzzer, or the like, and stands by in that state.

Hereinafter, the operation of discharging the defective yarn will be described with reference to FIG.

When the number of wefts to be discharged is set by the operator (step 100) and the switch 58 is depressed (step 101), the weft discharge control device 42 outputs a reverse rotation command to the loom control device 40 (step 100). 102). As a result, the loom control device 40 reverses the main shaft 46 so that the weft to be discharged first is discharged. This tapping is performed by opening the weaving front of the weft to be discharged first.

Next, the weft discharge control device 42 turns on the suction nozzle 52 (step 103), and
6 and the solenoid valves 36 and 50 are operated to eject air from the separation nozzle 50 (step 10).
4). Thereby, compressed air is ejected from the separation nozzle 50 and the sub-nozzle 16. Sub nozzle 16
May be turned on simultaneously with the separation nozzle 50, or may be turned on after the separation nozzle 50 is turned on. Further, all the sub-nozzles 16 may be turned on at the same time, or may be turned on gradually from the sub-nozzles 16 on the non-yarn feeding side. Further, only a few groups located on the non-yarn supply side may be turned on.

As shown in FIGS. 3 and 4, the compressed air from the separation nozzle 50 is ejected toward the reed 24 through the weaving front, so that the weft to be removed is first indicated by the reference numeral 12a. The compressed air from the detaching nozzle 50 separates the part on the non-yarn supply side from the weaving side. Next, the weft to be removed is gradually separated from the non-weft side portion toward the yarn feed side portion by the compressed air from the sub-nozzle 16 as indicated by reference numeral 12b, and finally indicated by reference numeral 12c. So that all parts are separated from the weave.
For this reason, there is no possibility that the defective yarn is curved in a U or V shape.

When the weft yarn 12c is completely pulled off from before weaving, the weft yarn is blown off to the non-supply side and is sucked by the suction nozzle 52. When the weft yarn 12c is sucked by the suction nozzle 52, the yarn sensor 56 senses that fact and outputs a detection signal indicating that there is a yarn to the weft discharge control device 42.

After a predetermined time has elapsed from the start of the discharging operation, the weft discharge control device 42 determines whether or not the sensing signal from the yarn sensor 56 has been input once and then stopped again, ie, whether or not the weft has been discharged. It is determined whether or not has been completed (step 105).

If the result of the determination in step 105 is that the discharge of the weft has not been completed, the discharge of the weft will not be completed despite the lapse of a predetermined time. Then, the operator is notified by a buzzer or the like, and the operation is terminated (step 106).

If the result of the determination in step 105 is that the discharge of the weft has been completed, the weft discharge control device 42 turns off the sub-nozzle 16, the separation nozzle 50 and the suction nozzle 52 (step 107), and then performs the above-described discharge. It is determined whether the operation has been repeated a predetermined number of times (step 10).
8).

If the result of determination in step 108 is that the discharge operation has not been repeated a predetermined number of times, the weft discharge control device 42
Returns to step 102 for discharging the next weft. Thereby, the opening of the next weft is opened, and the weft is discharged.

If the result of determination in step 108 is that the discharge operation has been repeated a predetermined number of times, the weft discharge control device 42
A restart command indicating that all the discharging operations are completed is output to the loom control device 40 (step 109). Thereby, the loom control device 40 operates the loom again.

Instead of being set by the operator at the start of the discharge operation, the number of discharges may be set before the loom is started. In this case, the above-described discharging operation may be automatically started when a weft insertion error is detected. Further, instead of setting the number of times of discharge in the setting device, the operator may depress the switch 58 for each weft to be discharged.

The above-described discharging operation is performed not only in the case of the weft having the seam 60 but also in the case of a weft insertion error such as a ben topic or a show topic.

However, when a ben topic or a show topic occurs, the leading end of the defective thread may not reach the working area of the compressed air injected from the separation nozzle 50 in some cases. Therefore, in this case, Japanese Patent Application Laid-Open No. 61-245
As in a known defective yarn removing device such as that described in Japanese Patent Application Laid-Open No. 339, 339, when the weft insertion error occurs, the cutter is deactivated and removed while being connected to the weft in the main nozzle. It is preferable to use a yarn removing device together. In this case, after removing the defective yarn, put the loom in the standby state,
Thereafter, a weft discharge operation may be executed as in the above embodiment.

In the case of a long pick, the defective yarn does not affect the previously inserted weft yarn. Therefore, in the case where the number of discharges is set in advance before the loom is started and the discharging operation is automatically performed, when a long pick occurs, the result of the determination that the discharging operation of the defective yarn has been completed. To execute step 107, and then execute step 109 without executing step 108. In this case, whether or not the pick is a long pick may be determined based on the detection signal of the unwinding sensor of the length measuring and storing device 22 that the weft having a predetermined number of turns or more has been unwound. When the long pick is discharged by a known defective yarn removing device, the loom may be restarted immediately after the discharge without finishing the loom after the discharge is completed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an air jet loom equipped with a weft discharge device of the present invention.

FIG. 2 is a view for explaining the operation of the weft discharging device of FIG. 1;

FIG. 3 is a view for explaining a state in which the weft is separated from the weaving by the weft discharging device of FIG. 1;

FIG. 4 is a left side view of FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 air jet loom 12 weft 14 main nozzle 16 sub nozzle 18 warp 20 yarn feeder 22 length measuring and storing device 24 reed 26 woven fabric 28 cutter 30 compressed air source 32, 36, 54 electromagnetic valve 44 weft sensing feeler 46 main shaft 48 Encoder 52 Suction nozzle 56 Thread sensor

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D03D 47 / 34,47 / 30

Claims (1)

(57) [Claims] 1. A weft measured by a length measuring device is inserted into a warp opening by a weft inserting means including a main nozzle and a plurality of sub-nozzles, and after the beating, the weft is inserted between the main nozzle and the yarn supply side. In a weft discharge device of an air jet loom for cutting by a cutter disposed between the woven cloth and a weaving device, a separating nozzle which is disposed on a non-feeding side and generates an airflow toward a reed after weaving, and a loom. After the reverse rotation outlet, the separating nozzle and the sub-nozzle are operated to separate the portion on the non-supply side of the weft from the weaving side by the injection of the separating nozzle, and then the portion adjacent thereto to the sub-nozzle. A weft discharge device for an air-jet loom, comprising: a control device for gradually separating the yarn from the non-weft side toward the yarn feed side by weaving.