WO2003035954A2

WO2003035954A2 - Method and apparatus for detecting warp breakage of fluid injection weaving machine

Info

Publication number: WO2003035954A2
Application number: PCT/JP2002/010737
Authority: WO
Inventors: Minoru Isa
Original assignee: Tsudakoma Kogyo Kabushiki Kaisha
Priority date: 2001-10-22
Filing date: 2002-10-16
Publication date: 2003-05-01
Also published as: JP2003129357A; EP1439251A2; WO2003035954A3

Abstract

A warp breakage detecting method being applied to a fluid injection weaving machine where a plurality of warps are inserted into a warp opening simultaneously. The warp breakage detecting method is characterized in that the arriving timing of a warp is measured through a warp sensor disposed in a warp moving passage, the measured arriving timing is compared with a reference timing, and thread breakage is detected when such a state that the arriving timing is earlier than the reference timing occurs a specified number of times continuously.

Description

Description: Method and apparatus for detecting weft breakage in a fluid jet loom

The present invention relates to a method and an apparatus for detecting weft breakage of a fluid jet loom, and more particularly to a method and an apparatus for detecting that one or more wefts out of a plurality of wefts to be inserted at the same time are broken. Background technology ''

As one of the weft breakage detection devices, a weft sensor that forms a beneficiary detection area is placed on the weft flight path on the reverse weft entry side, and when weft is not detected at a predetermined timing.

There is a technique for generating a loom stop signal by determining that there is no thread (Japanese Patent Laid-Open No. 58-174660).

Another example of a weft breakage detection device is that an optical yarn sensor detects a weft balloon that is drawn from a yarn feeder to a length measuring and storage device, and a release signal is generated.The release signal is no longer generated. There is a technology that determines that the weft of the yarn supplying body has run out and generates a yarn supplying yarn breakage signal (Japanese Patent Application Laid-Open No. HEI 3-1-191646).

However, in the former case, in the so-called double pick weft insertion, a plurality of wefts are simultaneously inserted into the warp shed to speed up weaving due to short-term delivery of woven fabric, etc. When a thread break occurs, it cannot be detected. -In the latter case, breakage of the supplied yarn can be detected, but it is not possible to detect breakage of the yarn such as cutting of the weft occurring downstream of the position where the yarn sensor is arranged. In addition, since a special weft sensor must be arranged for each weft to be inserted, the cost increases. Disclosure of the invention SUMMARY OF THE INVENTION An object of the present invention is to provide a fluid jet loom in which a plurality of wefts are simultaneously inserted into a warp shed, and a device having a simple structure detects any breakage of one of the wefts occurring upstream of the weft insertion nozzle. Is to get it.

INDUSTRIAL APPLICABILITY The weft break detection method and apparatus according to the present invention are applied to a weft break detection technology of a fluid jet loom that simultaneously inserts a plurality of wefts into a warp shed.

Such a weft break detection method measures the arrival timing of the weft via a weft sensor arranged on the weft movement path, compares the measured arrival timing with the reference timing, and the arrival timing is earlier than the reference timing. This includes detecting that a thread break has occurred when the state has occurred a predetermined number of times in succession.

Such a weft breakage detecting device measures the arrival timing of the weft via a weft sensor arranged on the weft movement path, and when the measured arrival timing is earlier than the reference timing, an early detection unit that generates a logic signal. And a determination unit that outputs a thread break signal when the logic signal is input a plurality of times in succession.

In a fluid jet loom that simultaneously inserts multiple wefts into the warp shed, if any of the wefts breaks upstream of the weft insertion nozzle (the weft supply side), the broken weft is replaced by the weft insertion nozzle. As a result, the injection fluid for weft acts only on the normal weft, so that the normal weft arrives at the specified position, so-called arrival timing is earlier than normal. .

Therefore, in the present invention, it is possible to reliably detect the breakage of one or more weft yarns, because the state in which the arrival timing is earlier than the reference timing has occurred multiple times consecutively. Further, since it is not necessary to provide a weft detection unit and a yarn breakage determination unit for each weft, the structure of the device is simplified. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a view showing one embodiment of a fluid jet loom equipped with a yarn breakage detecting device according to the present invention.

FIG. 2 is a block diagram of an electric circuit showing an embodiment of a weft detecting device provided with the yarn break detecting device according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Referring to FIG. 1, a fluid jet loom 10 using a weft breakage detecting device presses a plurality of (two in the illustrated example) wefts 12 into the openings of the warp 14 in the illustrated example. It is configured as an air-jet loom that wefts simultaneously with air.

In the fluid jet loom 10, each weft 12 is measured from the yarn supplying body 16 by the length of one pick to the length measuring storage device 18 by one pick and locked by the locking pin 20. It is stored and passed through the weft insertion nozzle 22 at the tip end. At the time of weft insertion, both the wefts 12 are unwound from the length measuring and storing device 18 and are simultaneously inserted into the opening of the warp 14 from the weft insertion nozzle 22 together with the compressed air for weft insertion.

During the weft insertion into the warp shedding, both wefts 12 are further subjected to a flying force by the compressed air injected from the plurality of sub-nozzles 24. The inserted weft yarn is beaten to the weave by a knot (not shown) and woven into the woven fabric 26, and thereafter is upstream by the cutter 28 between the weft insertion nozzle 22 and the woven fabric 26. Cut off from the side thread part.

At the time of weft insertion, when the weft yarn 12 retained in the length measuring storage device 18 is unwound by the locking pin 28, the surveying storage is performed by the traction force of the weft insertion nozzle 22 and the sub-nozzle 24. A balloon is drawn from device 18. This weft balloon is detected by an unwinding sensor for each weft 12 using a light transmitter 30 and a light receiver 32, and its output signal, that is, the unwind signal S1, is measured when the weft is wound. It is supplied to a control device (not shown) as a signal indicating that it has been extracted (unwound) from the long storage device 18.

The leading end of the inserted weft is detected by the yarn sensor 34 arranged on the non-yarn supply side and is also caught by a plurality of catch codes 36. The yarn sensor 34 includes a light emitter and a light receiver, and outputs an H-level yarn signal S2, which indicates that there is a yarn, to the weft detection device 40 when a weft exists in the weft detection area between the persons. I do. The catch cord 36 forms an opening with the warp 14 and catches the weft leading end cut at an appropriate time.

An angle signal 0 is supplied to the weft detecting device 40 in addition to the yarn signal S2. The angle signal 0 is a signal indicating the rotation angle of the main shaft 42 of the loom, and is generated by the encoder 44 that detects the rotation angle of the main shaft 42. Based on the supplied yarn signal S2 and the angle signal Θ, the weft detecting device 40 checks whether the yarn signal S2 is input when the rotation angle of the main shaft 42 is a predetermined value. When the input is not made, it is determined that the weft insertion is wrong, and the loom stop signal S3 at the H level for stopping the loom is output to a control device (not shown). The loom stop signal S3 at this time is a weft insertion error signal.

The yarn signal S 2 is generated as long as one or more weft yarns 12 are present in the weft detection area of the yarn sensor 34. For this reason, at least one of the plurality of wefts 12 to be inserted at the same time.Even if one weft 12 is broken due to wear or cutting of the weft, the other weft can reach. If this is detected, a yarn signal is output and a yarn break cannot be detected.

However, in the fluid jet loom 10, if any one of the wefts 12 breaks on the upstream side of the weft insertion nozzle 22, the broken weft will not be supplied to the weft insertion nozzle 22. As a result, in the subsequent weft insertion, the jetting fluid for weft operation acts only on the normal weft, and the so-called arrival timing at which the normal weft reaches the predetermined position is compared to when the weft is inserted normally. Faster.

Therefore, the weft detecting device 40 also measures the so-called arrival timing at which the leading end of the weft 12 reaches the position where the yarn sensor 34 is arranged, based on the supplied yarn signal S2 and angle signal 0, When the arrival timing is earlier than the reference timing compared to the measured reference timing, multiple consecutive occurrences have occurred, and it is determined that one of the weft yarns has broken, and the loom is stopped. The signal S3 is output to a control device (not shown). The loom stop signal S3 at this time is a yarn break signal.

Therefore, in the fluid jet loom 10, since a state in which the arrival timing is earlier than the reference timing occurs continuously more than once, the yarn breakage is detected, so that the yarn breakage of one or more wefts is reliably detected. Since the detection circuit can be used in common for a plurality of wefts, the structure of the weft detection device 40 can be simplified. With reference to FIG. 2, a specific example of the above-described weft detecting device 40 will be described. The weft detector 40 receives the yarn signal S 2 from the yarn sensor 34 at the weft insertion error detector 50 and the yarn break detector 52, and receives the angle signal から from the encoder 44 to the yarn break detector 5. 2 and the timing signal generator 54. Based on the input angle signal 0, the timing signal generator 54 outputs the timing signal S4 that becomes H level only during the period corresponding to the weft detection period to the weft insertion error detection unit 50 and the advance detection unit 52. Supply. The generation timing of the timing signal S4 is set in the timing setting unit 56. Such a timing signal S4 is a signal that is turned on (H level) at 200 degrees, and turned off (L level) at 290 degrees when the crossing is set to 0 degree. Can be.

Based on the yarn signal S2 and the angle signal 0, the weft insertion error detection section 50 checks whether the yarn signal S2 is input when the rotation angle of the main shaft 42 is a predetermined value. This is a well-known circuit that, when not input, determines a weft insertion error and outputs an H-level weft insertion error signal S5.

The yarn breakage detection section 52 receives the yarn signal S2 and the angle signal 0 at the arrival angle detector 58. The arrival angle detector 58 detects the rotation angle θ1 of the main shaft when the leading end of the weft reaches the position where the yarn sensor 34 is located, based on the received yarn signal S2 and the angle signal Θ, and performs detection. The output arrival angle 61 is output to the comparator 60 as the arrival timing S6. The arrival angle 01 can be, for example, the value of the angle signal 0 (the rotation angle of the main shaft 42) when the thread signal S2 is turned on.

Each time the timing signal S4 is input, the comparator 60 compares the arrival timing S6 with the reference timing S7 set in the threshold value setting device 62, and determines that the arrival timing S6 is greater than the reference timing S7. When it is too early, a pulse-like signal S8 is generated to indicate that. The arrival angle detector 58, the comparator 60, and the threshold value setting unit 62 form an advance detection unit 64 that measures that the arrival timing of the weft to the predetermined position is normal when it is normal.

The reference timing S7 set in the threshold value setting device 62 can be a timing at which all the wefts to be inserted at the same time normally reach the arrangement position of the yarn sensor 34. It is preferable that the reference timing S7 be in a range that does not include such a variation in consideration of the variation when all the wefts are normally inserted, and the output signal S8 of the advance detection unit 64 Is supplied to a counter 66. The counter 6'6 counts the signal S8 and sets the threshold value every time the timing signal S4 is input. Compares with the reference count set in the container 68, and when the count value becomes equal to or more than the reference count, generates an H level thread break signal S9. The counter 66 and the threshold value setting unit 68 form a discriminating unit 70 for judging whether or not the force has reached the arrival timing S6 earlier than the reference timing S7 by a predetermined number of times.

For example, when the weft arrival timing in the normal state has a variation of ± 6 degrees with respect to the spindle angle of 230 degrees, the reference timing of the threshold setting unit 62 is set to 22 degrees in consideration of this, while Set the reference count threshold value of threshold setting device 6 8 to 2. Then, during the operation of the loom, if the yarn breaks in one of the two wefts inserted simultaneously, the weft reaches 12 degrees earlier than the normal 230 degrees (that is, to 21.8 degrees). However, since the jet flow after the weft insertion of the next pick acts intensively on the normal (non-broken) weft, early arrival of the weft occurs continuously as in the previous pick. In other words, after the occurrence of a thread break, the signal S8 is continuously generated each time weft insertion is performed, and this is counted by the counter 66.As a result, the thread break detector 52 detects the second to third picks from the occurrence of the thread break. The loom can be stopped by generating a stop signal.

The reference number set in the threshold value setting unit 68 is the number of times for determining that the yarn is broken, and a value of 2 or more is set. If the reference frequency is large, the stoppage of the loom is delayed, and if the reference frequency is too small, an erroneous stop (idling) occurs due to sudden advance. Therefore, it is desirable to determine the reference number based on actual operating conditions.

The thread break signal S 9 is supplied to one input terminal of the OR circuit 74 via the output circuit 72. The OR circuit 74 receives the insertion error signal S5 at the other input terminal, and outputs a logical sum signal of the two input signals S5 and S9 as a loom stop signal S3.

According to the weft detecting device 40, the yarn breakage is detected when a state in which the arrival timing is earlier than the reference timing occurs multiple times in succession, so that the yarn breakage of one or more wefts can be reliably detected. In addition, the advance detection unit 64, the discrimination unit 70, and the output circuit 72 can be commonly used by a plurality of wefts, and the structure of the device is simplified. In the above embodiment, the following modifications are possible. The number of wefts input simultaneously is not limited to the above two, and may be three or more. In addition, when multiple weft insertions are simultaneously changed to different yarn types for each weft insertion pick, a plurality of weft insertion devices, such as a length measuring storage device and a weft insertion nozzle, are arranged correspondingly. With weft breakage detection device The reference timing in the advance detection unit and the reference count in the determination unit are also set according to the yarn type, and weft insertion and weft breakage detection can be performed in response to switching of the selected yarn type.

In the above embodiment, instead of using the signal of the yarn sensor 34 arranged on the non-weft insertion side to detect the presence / absence of yarn breakage, a yarn sensor arranged in the warp opening for weft insertion control, The output signal of another yarn sensor disposed on the weft flight path, such as a yarn sensor disposed downstream of the main nozzle, may be used, or the unwinding sensor in FIG. 1 or the yarn feeder 16 in FIG. An output signal of a yarn sensor disposed on the remaining weft movement path excluding the weft flight path, such as a yarn sensor disposed between the length measurement storage device 18 and detecting the balloon, may be used.

When the output signal of the unwinding sensor in FIG. 1 is used to detect the presence or absence of a yarn break, the unwinding signal S 1 is indirectly related to the leading end position of the weft, such that the unwinding timing is related to the arrival timing. From this, it is possible to determine that the yarn is broken when the arrival timing (the timing of unwinding) is continuously advanced.

As a yarn sensor for detecting the weft, not only an optical sensor, but also a suitable type of sensor such as a contact type, a non-contact type, a capacitance type, a magnetic type, a reflection type, and a transmission type may be used. it can.

Instead of arranging the yarn break detecting section in the conventional weft detecting device as in the embodiment shown in FIG. 2, the yarn break detecting device may be made independent of the weft detecting device. Instead of using the rotation angle of the main shaft as a measure of the arrival timing, the elapsed time from the reference angle may be used.

The thread breakage detection function does not need to be constantly activated during operation of the loom, and may be deactivated according to control on the loom side. For example, in conjunction with known weft insertion control such as fluid injection timing control and pressure control to make the arrival timing constant or to change the winding diameter of the yarn supply, weft insertion control is performed. During the injection timing (during the change of the fluid pressure), the thread breakage detection function may be disabled. Also, the yarn breakage detection function may be disabled when the flight characteristics of the weft yarn change significantly, such as during the period immediately after start-up or when the yarn supply is switched.

The present invention relates to a liquid jet loom using a liquid such as pressurized water as a weft insertion fluid. It can also be applied to such a weft breakage detecting device of another fluid jet loom. The present invention is not limited to the above embodiments, and can be variously modified without departing from the gist thereof.

Claims

The scope of the claims

1. A weft break detection method for a fluid jet loom that simultaneously inserts a plurality of wefts into a warp shed, and measures the arrival timing of the weft via a weft sensor arranged on the weft movement path. A weft breakage detection method for a fluid jet loom, comprising: comparing the reached arrival timing with a reference timing; and detecting that the arrival timing is earlier than the reference timing when a predetermined number of consecutive occurrences occur.

2. A weft breakage detection device of a fluid jet loom that simultaneously inserts a plurality of wefts into the warp shed, and measures the arrival timing of the weft via a weft sensor arranged on the weft movement path. A fluid ejection type, which includes an advance detection unit that generates a logic signal when the arrival timing is earlier than the reference timing, and a determination unit that outputs a thread breakage signal when the logic signal is continuously input a plurality of times. Weft breakage detector for looms.