JP7156201B2 - Weft defect determination device for loom - Google Patents

Description

The present invention relates to a weft defect determination device for a loom.

In a loom, a normal weft insertion error may occur due to a weft yarn running error. In addition to weft insertion errors, fabric defects may occur due to weft defects caused by differences in the thickness of the inserted weft yarns and the number of weft yarns from specified values.

Conventionally, in order to detect weft defects, a sensor for detecting the thickness of the weft was provided upstream of the weft storage device (see, for example, Patent Document 1). Weaving is stopped when this sensor detects a weft defect.

Special Table 2014-500915

However, in Patent Document 1, there is a problem that a dedicated sensor for detecting the thickness of the weft is required. Providing a dedicated sensor increases the manufacturing cost of the loom and also increases the number of maintenance and inspection points. Further, when a dedicated sensor is provided, it is necessary to correctly pass the weft through the dedicated sensor, but the weft sensor does not detect the weft normally unless the weft is correctly passed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a weft defect determination apparatus for a loom capable of determining a weft defect without requiring a dedicated sensor for detecting the weft defect. on offer.

In order to solve the above problems, the present invention provides a weft inserting nozzle for inserting a weft into a weft flying path, a balloon sensor for detecting the unwinding of the weft from the weft measurement and storage device, and the weft flying. a weft arrival sensor for detecting arrival of the weft on the opposite side of the running path to the weft insertion nozzle; and a loom rotation angle detection sensor for detecting detection timings of the detection signals of the balloon sensor and the weft arrival sensor. wherein the balloon sensor detects one of a plurality of sensor signals including a plurality of unwinding signals detected by the balloon sensor and an arrival signal detected by the weft arrival sensor. A first range is set with respect to the detection timing of the first sensor signal, and the first sensor signal is detected after the first sensor signal. A second range is set with respect to the detection timing of the sensor signal of No. 2, the second range is set larger than the first range, and the detection timing of the first sensor signal and the detection timing of the second sensor signal are set. exceeds the corresponding first range and the second range, respectively, the determination unit determines that a weft defect has occurred.

In the present invention, when the detection timing of the first sensor signal and the detection timing of the second sensor signal exceed the corresponding first range and second range, respectively, it means that the weft yarn is delayed in a specific period during the flight period of the weft yarn. Indicates arrival or early arrival. The determination unit determines that a weft defect occurs when the detection timing of the first sensor signal and the detection timing of the second sensor signal exceed the corresponding first range and second range, respectively. The determination unit determines that no weft defect occurs when the detection timing of the first sensor signal and the detection timing of the second sensor signal do not exceed one of the corresponding first range and second range. do. As a result, it is possible to determine whether or not there is a weft defect without adding a dedicated sensor for detecting the weft defect. A weft defect means a defect caused by the fact that the inserted weft is a weft with a different thickness than the specified weft, or the excess or deficiency of the number of inserted wefts.

Further, in the weft defect determination device for a loom, both the first sensor signal and the second sensor signal are unraveling signals detected by the balloon sensor, and the second sensor signal is more sensitive than the second sensor signal. An arrival signal detected later and detected by the weft arrival sensor is defined as a third sensor signal, a third range is set with respect to the detection timing of the third sensor signal, and the third range is the second range. the first range, which is set to be larger, and the determination unit corresponds to all of the detection timing of the first sensor signal, the detection timing of the second sensor signal, and the detection timing of the third sensor signal; If the second range and the third range are exceeded, it may be determined that a weft defect has occurred.
In this case, all of the detection timing of the first sensor signal, the detection timing of the second sensor signal, and the detection timing of the third sensor signal exceed the corresponding first range, second range, and third range. , indicates late or early weft arrival during most of the weft flight period. Therefore, the determination unit determines not only the first range and the second range to which the detection timing of the first sensor signal, the detection timing of the second sensor signal, and the detection timing of the third sensor signal correspond, but also the third range. If the range is exceeded, it is determined that a weft defect has occurred. Therefore, it is possible to reliably determine whether or not there is a weft defect.

Further, in the weft defect determination device for a loom, the first sensor signal is the last unraveling signal among a plurality of unraveling signals detected by the balloon sensor, and the second sensor signal is , an arrival signal detected by the weft arrival sensor.
In this case, the first sensor signal is the final unwinding signal among the plurality of unwinding signals detected by the balloon sensor, and the second sensor signal is the arrival signal detected by the weft arrival sensor. Therefore, when the detection timing of the first sensor signal and the detection timing of the second sensor signal exceed the corresponding first range and second range, it means that the weft arrival is delayed after the latter half of the weft flight period. Or indicate early arrival. Therefore, when the detection timing of the first sensor signal and the detection timing of the second sensor signal exceed only the corresponding 21st range and the second range, the determination unit determines that a weft defect has occurred. For example, when two wefts are inserted and weaving is performed, if only one weft is cut during running, premature arrival of the weft occurs after the second half of the weft running period. It can be determined that a weft defect due to breakage has occurred.

According to the present invention, it is possible to provide a weft defect determination device for a loom that can determine a weft defect without requiring a sensor dedicated to detecting a weft defect.

1 is a schematic diagram showing a weft insertion device of an air jet loom according to a first embodiment; FIG. FIG. 4 is a diagram showing a flying curve of weft yarns in the air-jet loom according to the first embodiment; FIG. 4 is a diagram showing a range set by the weft defect determination device of the air-jet loom according to the first embodiment; FIG. 4 is a flowchart showing a weft defect determination process by the weft defect determination device of the air jet loom according to the first embodiment; FIG. 10 is a diagram showing a range set by a weft defect determination device of an air-jet loom according to a modification; FIG. 10 is a diagram showing a flying curve of weft yarns in the air-jet loom according to the second embodiment; FIG. 10 is a diagram showing a range set by a weft defect determination device for an air-jet loom according to a second embodiment;

(First embodiment)
A weft defect determination device for a loom according to the first embodiment will be described below with reference to the drawings. The loom of this embodiment is an air jet loom that causes the weft to fly by jetting compressed air. In this embodiment, with respect to the weft insertion direction in which the weft is inserted into the warp shed and the weft is conveyed, the side opposite to the weft insertion direction is defined as upstream, and the weft insertion direction is defined as downstream.

As shown in FIG. 1, a weft inserting device 10 provided in an air jet loom includes a weft inserting nozzle 11, a yarn feeding section 12, a weft length measuring and storage device 13, a reed 14, a plurality of sub-nozzles 15, and a control device 16. and a display device 17 .

The yarn supplying section 12 is arranged upstream of the weft inserting nozzle 11 . The weft supply section 12 is, specifically, a weft cheese in which a weft is wound around a cone, and the weft cheese is supported by a cheese stand (not shown) provided on the side of the machine. The weft Y of the yarn supplying section 12 is pulled out by the rotation of a winding arm (not shown) of the weft length measurement and storage device 13 and is stored in the weft length measurement and storage device 13 .

The weft length measurement storage device 13 is fixed to a bracket (not shown) attached to the floor beside the loom. The weft length measurement storage device 13 includes a storage drum 18 , a weft locking pin 19 and a balloon sensor 20 . The storage drum 18 stores the weft Y in a wound state. Weft locking pins 19 and balloon sensors 20 are arranged around the storage drum 18 . The weft locking pin 19 is a retractable pin that locks the weft Y to the storage drum 18 and is electrically connected to the control device 16 . The weft locking pin 19 is retracted from the forward state at the rotation angle of the loom preset by the control device 16 , and unwinds the weft Y stored in the storage drum 18 . The timing at which the weft Y is unwound by the weft locking pin 19 is the weft insertion start timing.

The balloon sensor 20 is a sensor for detecting the unwinding of the weft Y from the weft length measuring and storage device 13 and is electrically connected to the control device 16 . The balloon sensor 20 detects the weft Y unwound from the storage drum 18 during weft insertion and transmits a weft unwinding signal to the controller 16 . The control device 16 operates the weft locking pin 19 when receiving a predetermined number of weft unwinding signals. The weft locking pin 19 locks the weft Y unwound from the storage drum 18 to complete the weft insertion. In this embodiment, since the winding amount of the weft Y corresponding to one weft insertion is three turns, the weft unwinding signal is transmitted three times during one weft insertion.

The operation timing for the weft locking pin 19 to lock the weft Y is set according to the number of turns required to store the weft Y having a length corresponding to the weaving width TL in the storage drum 18 . . In this embodiment, the control device 16 is set so that an operation signal for locking the weft Y is transmitted to the weft locking pin 19 when the weft unwinding signal from the balloon sensor 20 is received three times. Therefore, in the weft insertion device 10 of the present embodiment, the weft Y corresponding to the weft storage length of three turns of the storage drum 18 is inserted.

By the way, the air jet loom has an encoder 21 for detecting the rotation angle of the main shaft (loom rotation angle). Encoder 21 is connected to controller 16 . The weft detection signal from the balloon sensor 20 is recognized as the weft unwinding timing based on the loom rotation angle signal obtained from the encoder 21 in the controller 16 . The encoder 21 corresponds to a loom rotation angle detection sensor that detects each loom rotation angle at the detection timing of the detection signal of the balloon sensor 20 .

The weft inserting nozzle 11 has a tandem nozzle 22 for drawing out the weft Y from the storage drum 18 and a main nozzle 23 for inserting the weft Y. A brake 24 is provided on the upstream side of the tandem nozzle 22 to brake the flying weft Y before the weft insertion is completed.

A main nozzle 23, a sub-nozzle 15 and a reed 14 are arranged on the sley (not shown). The slay is reciprocally swingable in the longitudinal direction of the air jet loom. Therefore, the main nozzle 23, the sub-nozzle 15 and the reed 14 reciprocate along with the sley in the longitudinal direction of the air jet loom. The tandem nozzle 22 and the brake 24 are fixed to a bracket (not shown) or the like attached to the machine base (not shown) of the air jet loom.

A weft running path 25 along which the weft Y runs is formed on the reed 14 . An end sensor 26 as a weft arrival sensor is provided on the downstream side of the weft flight path 25 . The end sensor 26 is arranged downstream of the weaving width TL. Therefore, the end sensor 26 is arranged outside the weaving width TL on the side opposite to the main nozzle 23 in the weft flying path 25 . The end sensor 26 detects the position of the tip of the weft Y corresponding to the weft storage length of three turns of the storage drum 18 when the weft Y is normally inserted. It is arranged outside the weave width TL.

As shown in FIG. 1, end sensor 26 is electrically connected to control device 16 . A weft detection signal from the end sensor 26 is a weft Y arrival signal. It is recognized as the weft tip arrival timing TW at which the position is reached.

An in-width sensor 27 as a weft arrival sensor is provided on the weft flight path 25 within the weft width TL on the upstream side of the end sensor 26 . The in-width sensor 27 is located on the opposite side of the main nozzle 23 from the center of the weft width TL on the weft flying path 25 . Therefore, the weave width sensor 27 is provided at a position close to the end sensor 26 . The weaving width sensor 27 is provided within the weaving width TL so as to detect the tip of the weft Y when the weft Y is normally inserted. The weave width sensor 27 is electrically connected to the controller 16 . The weft detection signal from the weaving width sensor 27 is detected by the control device 16 based on the loom rotation angle signal obtained from the encoder 21 , and the weft middle point where the tip of the inserted weft Y reaches the detection position of the weft width sensor 27 . Recognized as arrival timing.

The main nozzle 23 is connected to a main valve 31 via a pipe 32 . The main valve 31 is a valve for supplying and stopping compressed air to the main nozzle 23 . The main valve 31 is connected to the main air tank 33 via a pipe 34 . The tandem nozzle 22 is connected to a tandem valve 35 via a pipe 36 . The tandem valve 35 is a valve for supplying and stopping compressed air to the tandem nozzle 22 . The tandem valve 35 is connected via a pipe 38 to the main air tank 33 shared with the main valve 31 .

The main air tank 33 is connected via a main pressure gauge 39, a main regulator 40, an original pressure gauge 41 and an air filter 42 to a common air compressor 43 installed in the weaving factory. The main air tank 33 stores compressed air supplied from the air compressor 43 and adjusted to a set pressure by the main regulator 40 . A main pressure gauge 39 constantly detects the pressure of compressed air supplied to the main air tank 33 .

The sub-nozzles 15 are divided into a plurality of sub-nozzle groups, and are divided into six sub-nozzle groups in this embodiment. Each sub-nozzle group has four sub-nozzles 15 . Six sub-valves 44 are arranged corresponding to each sub-nozzle group. The sub-valve 44 is a valve that supplies compressed air to the sub-nozzles 15 of each sub-valve group. Each group of sub-nozzles 15 is connected to each sub-valve 44 via a pipe 45 . Each sub-valve 44 is connected to a common sub-air tank 46 .

The sub-air tank 46 is connected to the sub-regulator 48 via the sub-pressure gauge 47 . Also, the sub-regulator 48 is connected by a pipe 49 to a pipe 50 that connects the main pressure gauge 39 and the main regulator 40 . The sub-air tank 46 stores compressed air supplied from the air compressor 43 and adjusted to a set pressure by the sub-regulator 48 . Also, the sub pressure gauge 47 constantly detects the pressure of the compressed air supplied to the sub air tank 46 .

Main valve 31 , tandem valve 35 , sub-valve 44 , primary pressure gauge 41 , main pressure gauge 39 , sub-pressure gauge 47 and brake 24 are electrically connected to control device 16 . Operation timings and operation periods for operating the main valve 31 , the tandem valve 35 , the sub-valve 44 and the brake 24 are preset in the control device 16 . The control device 16 also receives detection signals from the original pressure gauge 41 , the main pressure gauge 39 and the sub pressure gauge 47 .

An operation command signal is output from the control device 16 to the main valve 31 and the tandem valve 35 at a timing earlier than the weft insertion start timing at which the weft locking pin 19 is actuated, and compressed air is injected from the main nozzle 23 and the tandem nozzle 22. be done. An operation command signal is output to the brake 24 from the control device 16 at a timing earlier than the weft tip arrival timing TW at which the weft locking pin 19 is actuated to lock the weft Y of the storage drum 18 . The brake 24 slows down the flying speed of the weft Y by braking the weft Y flying at high speed, thereby mitigating the impact of the weft Y at the weft tip arrival timing TW.

Various fabric conditions and weaving conditions are registered and stored in the control device 16 . The woven fabric conditions include, for example, the material of the yarn used for the weft Y, the type of weft such as count, the weft density, the material of the yarn used for the warp, the type of warp such as count, the warp density, the weaving width, and the fabric structure. is The weaving conditions include, for example, the rotation speed of the air jet loom, the pressure of the compressed air in the main air tank 33 and the sub air tank 46, the opening degrees of the main valve 31 and the tandem valve 35, the weft insertion start timing, the target weft tip arrival timing, and the like. included.

The display device 17 has a display function and an input function. For example, in addition to displaying various weaving conditions and weaving conditions, these conditions can be set or changed by an input operation. The display device 17 can also display a warning when an abnormality occurs during weaving.

By the way, in this embodiment, when the weft Y is unwound from the storage drum 18, the balloon sensor 20 transmits the weft unwinding signal three times. Therefore, the controller 16 recognizes the first weft unwinding timing Tb1 based on the loom rotation angle signal obtained from the encoder 21 when the first weft unwinding signal is detected. Similarly, in the control device 16, based on the loom rotation angle signal obtained from the encoder 21 when the second and third weft unwinding signals are detected, the second weft unwinding timing Tb2 and the third weft unwinding timing Tb2 are detected. The timing Tb3 of the hour is recognized. In this embodiment, the second weft unwinding signal from the balloon sensor 20 corresponds to the first sensor signal, and the third weft unwinding signal from the balloon sensor 20 corresponds to the second sensor signal.

In the control device 16, based on the loom rotation angle signal obtained from the encoder 21, the weft tip arrival timing TW at which the tip of the inserted weft Y reaches the detection position of the end sensor 26 is recognized. In this embodiment, the weft detection signal from the end sensor 26 corresponds to the third sensor signal.

If the inserted weft Y is not an abnormal weft that causes a weft defect due to the weft thickness or the number of wefts, the weft running curve is, for example, the solid line running curve M1 shown in FIG. If the inserted weft yarn Y is an abnormal weft yarn, it becomes, for example, a flying curve M2 indicated by a one-dot chain line shown in FIG. 2 or a flying curve M3 indicated by a two-dot chain line. The weft defect means a defect caused by the fact that the inserted weft Y is a weft different in thickness from the stipulated weft yarn, the excess or deficiency of the number of the weft yarns Y to be inserted, and the like.

The running curve M2 of the dashed dotted line in FIG. 2 is an example of a running curve when the weft Y is thicker than the specified value or when the number of wefts Y is large. Compared to the flight curve M1, the flight of the weft Y is delayed as a whole during the flight period. The flying curve M3 of the two-dot chain line in FIG. 2 is an example of a flying curve when the weft Y is thinner than the specified value or the number of wefts Y is small. Compared to the flight curve M1, it is generally faster in the flight period. That is, premature arrival of the weft occurs.

The control device 16 of this embodiment determines whether or not there is a weft defect. As shown in FIG. 3, the control device 16 sets a first range (±α) for timing Tb2, a second range (±β) for timing Tb3, and a third range (±γ) for timing TW. is doing. In other words, the control device 16 detects the first sensor signal at the detection timing (timing Tb2 ), a second range for the detection timing (timing Tb3) of the second sensor signal detected after the first sensor signal, and a third range detected after the second sensor signal A third range is set for the sensor signal detection timing (timing TW).

In this embodiment, the first range, the second range, and the third range are all set by the loom rotation angle. The first range, the second range, and the third range are set empirically based on past weaving data or the like. Note that the timing Tb1 is the timing at the time of the first weft unwinding, so it is not the timing for which the range is set.

The second range (±β) is larger than the first range (±α), and the third range (±γ) is larger than the second range (±β) (α<β<γ). Based on this condition, the control device 16 determines whether or not there is a weft defect.

The control device 16 processes a series of steps (S01 to S07) shown in the flow chart of FIG. The control device 16 determines that a weft defect occurs when the timing Tb2 exceeds the first range, the timing Tb3 exceeds the second range, and the timing TW exceeds the third range (steps S01 to S04). ). If any one of the timings Tb2, Tb3, and TW does not exceed the corresponding first range, second range, or third range, the control device 16 determines that no weft defect has occurred (step S07). ).

When it is determined that a weft defect has occurred, the control device 16 causes the display device 17 to display a warning to the effect that a weft defect has occurred (see step S05). Further, the controller 16 stops the operation of the air jet loom (see step S06). When the control device 16 determines that there is no defective weft yarn, the processing ends.

Incidentally, in the case of a flying error due to looseness of the tip of the weft Y, the timing TW exceeds the third range, but the timing Tb2 does not exceed the first range and the timing Tb3 does not exceed the second range either. In this case, the weft Y is unwound without delay at the timings Tb2 and Tb3, but only the timing TW detected by the end sensor 26 is delayed due to the looseness of the tip of the weft Y. Therefore, it is possible to distinguish from the weft defect in which the range deviation occurs at timings Tb2 and Tb3 as well.

As described above, the weft defect determination device for the air jet loom of this embodiment includes the weft insertion nozzle 11, the balloon sensor 20, and the end sensor . In the weft defect determination device for an air-jet loom, the first range (±α ), a second range (±β) and a third range (±γ) are set. The second range (±β) is set larger than the first range (±α), and the third range (±γ) is set larger than the second range. Further, the weft defect determination device of the air jet loom determines that a weft defect occurs when all of the timings Tb2, Tb3, and TW exceed the corresponding first range, second range, and third range. 16.

Next, the weft defect determination device for the air jet loom of this embodiment will be described. When no weft defect occurs, the timing Tb2 does not exceed the first range, as shown in FIG. The timing Tb3 does not exceed the second range. Also, if there is no flying error such as loosening of the tip, the timing TW does not exceed the third range.

Next, the case where a weft defect occurs will be described. For example, if the weft yarn Y that is thicker than the weft yarn to be inserted is inserted due to a mistake in the weft cheese as the yarn supplying section 12, the timing Tb2 exceeds the first range (±α). Then, the timing Tb3 exceeds the second range (±β), and the timing TW exceeds the third range (±γ).

For this reason, as shown by the running curve M2 indicated by the one-dot chain line in FIG. 2, the weft yarn Y to be inserted is delayed as a whole during the running period compared to the weft yarn of the running curve M1. In other words, the late arrival of the weft occurs. In this case, the control device 16 determines that a weft defect has occurred, causes the display device 17 to display a warning to the effect that a weft defect has occurred, and stops the operation of the air jet loom. If two wefts Y, which should have been inserted one weft, are inserted for some reason, the flying curve will be the same as the flying curve M2 when the weft Y is thick, and the control device 16 will cause a weft defect. determined to be

Next, for example, a case where a weft thinner than the weft Y to be weft-inserted is inserted will be described. When a weft yarn thinner than the weft Y to be weft-inserted is inserted, the timing Tb2 exceeds the first range (±α). Then, the timing Tb3 exceeds the second range (±β), and the timing TW exceeds the third range (±γ).

For this reason, as shown by the running curve M3 indicated by the two-dot chain line in FIG. 2, the weft yarn Y to be weft-inserted is generally earlier in the running period than the weft yarn of the running curve M1. That is, premature arrival of the weft occurs. In this case, the control device 16 determines that a weft defect has occurred, causes the display device 17 to display a warning to the effect that a weft defect has occurred, and stops the operation of the air jet loom.

The weft defect determination device for an air-jet loom according to the present embodiment has the following effects.
(1) When the timings Tb2, Tb3, and TW exceed the first range (±α), the second range (±β), and the third range (±γ), respectively, the weft Y is delayed during the entire weft flight period. Indicates arrival or early arrival. When the timings Tb2, Tb3, and TW exceed the first range (±α), the second range (±β), and the third range (±γ), respectively, the control device 16 as a determination unit determines that a weft defect has occurred. determine that there is If any one of the timings Tb2, Tb3, and TW does not exceed the corresponding first range, second range, or third range, the control device 16 determines that no weft defect has occurred. As a result, it is possible to determine whether or not there is a weft defect without adding a dedicated sensor for detecting the weft defect.

(2) When the timings Tb2, Tb3, and TW exceed the corresponding first range (±α), second range (±β), and third range (±γ), the controller 16 determines that a weft defect occurs. Therefore, it is possible to distinguish between abnormal weft insertion due to a mistake in flying of the weft Y and abnormality due to a delay in the leading end due to looseness of the leading end of the weft. Therefore, it is possible to more reliably determine whether or not there is a weft defect.

(3) The control device 16 determines that a weft defect occurs when the timings Tb2, Tb3, and TW exceed the corresponding first range (±α), second range (±β), and third range (±γ), respectively. determined to be Therefore, compared with the case where the control device 16 determines that a weft defect occurs only at any two of the timings Tb2, Tb3, and TW, it is easier to suppress erroneous determinations due to errors in each detection timing. .

(Modification)
In the first embodiment, the first range (±α), the second range (±β), and the third range (±γ) are set by the loom rotation angle. Next, the past data of the detection timing of the weft-inserted weft yarn is used as a population, and each range is set using the standard deviation σn. In this modification, a first range (±5σ1) is set for the timing Tb2. Similarly, a second range (±5σ2) is set for the timing Tb3, and a third range (±5σ3) is set for the timing TW.

It is empirically known that the value of the standard deviation σn of the detection timing increases as the weft insertion progresses. ±5σ3) is greater than the second range (±5σ2). The control device 16 determines that a weft defect occurs when the timings Tb2, Tb3, and TW exceed the first range (±5σ1), the second range (±5σ2), and the third range (±5σ3), respectively. According to the modified example, it is possible to determine whether or not a weft defect has occurred without setting a range for the rotation angle of the loom. Note that the constant by which the standard deviation σn is multiplied is set to 5 in any range, but the constant may be changed according to various conditions.

(Second embodiment)
Next, a weft defect determination device for an air jet loom according to a second embodiment will be described. This embodiment differs from the first embodiment in that two wefts are inserted at the same time. Since the configuration of each part in the present embodiment is the same as that in the first embodiment, the description of the first embodiment is used and common reference numerals are used.

The air-jet loom of this embodiment is configured to insert two wefts Y at the same time. Although not shown, it includes a pair of weft supply units 12 and one weft length measuring and storage device 13 that measures and stores two wefts corresponding to the pair of yarn supply units 12 . Therefore, the weft inserting device 10 of the present embodiment stores the wefts Y in the weft measuring and storing device 13 at the same timing, unwinds the two wefts Y at the same time, and inserts the wefts.

In this case, the flying curve of the two weft yarns Y that are inserted at the same time becomes a flying curve M4 similar to the flying curve M1 of the first embodiment, as shown by the solid line in FIG. In an air-jet loom that inserts two wefts Y, one of the wefts Y may be cut while the two wefts Y are flying. A running curve when any one of the weft Y is cut during running of the two wefts Y is, for example, a running curve M5 indicated by a dotted line in FIG. In this case, since the two wefts Y are flying until around timing Tb2, the flying curve M4 is the same as the solid line flight curve M4 until around timing Tb2, and the weft Y is premature from around timing Tb2. be That is, early arrival of the weft Y occurs in a specific period (mainly in the latter half) of the flying period. It should be noted that there is a high probability that the two wefts Y will be inserted normally in the next weft insertion.

A running curve M6 indicated by a two-dot chain line in FIG. 6 is an example of a running curve where, for some reason, three wefts are inserted during the weft insertion of two wefts Y. As shown in FIG. In this case, since the two wefts Y are flying until around timing Tb2, the flying curve M4 is the same as the solid line flight curve M4 until around timing Tb2, and the weft yarn delay is shown from around timing Tb2. . In other words, the detection timing is delayed in a specific period (mainly the latter half) of the flying period.

In this embodiment, as shown in FIG. 7, the control device 16 sets a first range (±α) for the timing Tb3 and a second range (±β) for the timing TW. In this embodiment, the timing Tb3 (the detection timing of the last unwinding signal) excluding the timing Tb2 and the timing TW are used as materials for determination. That is, the timing Tb2 is not used for determining whether or not there is a weft defect.

Since the timings Tb3 and TW correspond to the latter half of the flying period, determination using the first range (±α) with respect to the timing Tb3 and the second range (±β) with respect to the timing TW This is effective in detecting weft breakage on the way. Also, unlike the case where wefts with different thicknesses are inserted, there is a high probability that two wefts will be inserted normally in the next weft insertion. Therefore, it is necessary to reliably and quickly determine that a weft defect has occurred due to yarn breakage. In this embodiment, it is possible to reliably and quickly determine that a weft defect has occurred due to yarn breakage.

Even if two wefts Y are inserted, either a thicker weft than the weft Y to be inserted is inserted, or the number of wefts is, for example, three wefts Y from the beginning of weft insertion. In the case of , for example, as in the first embodiment, the weft Y is delayed as a whole during the flying period as indicated by the flying curve M2 indicated by the dashed-dotted line in FIG. Conversely, when a weft that is thinner than the weft Y to be weft-inserted is inserted, or when the number of wefts is, for example, one weft Y from the beginning of weft insertion, the first embodiment is used. Similarly, the weft yarn is generally quickened during the flight period, as shown by the flight curve M3 indicated by the two-dot chain line in FIG.

According to this embodiment, when two wefts Y are weft-inserted and weaving is performed, if only one weft Y is cut during running, the weft Y arrives early after the second half of the running period of the weft Y. occurs. Therefore, the control device 16 can reliably and quickly determine that a weft defect has occurred due to yarn breakage during flying.

It should be noted that the above-described embodiment (including modifications) is one embodiment of the present invention, and the present invention is not limited to the above-described embodiment. Various changes are possible within.

In the above embodiment, the weft defect is determined based on the arrival signal of the end sensor 26, but the weft defect may be determined based on the signal of the weaving width sensor 27 instead of the end sensor 26. In this case, the weave width sensor 27 is preferably located near the end sensor 26 so that the signal of the weave width sensor 27 is transmitted after the last release signal of the balloon sensor 20 .
In the above-described embodiment (including modifications), the number of weft unwinding detected by the balloon sensor 20 is three, but the number of weft unwinding detected by the balloon sensor 20 is not limited to three. The number of weft unwindings detected by the balloon sensor 20 may be 3 to 6 depending on the weaving width. In this case, the weft defect may be determined based on not only the first to third unwinding signals but also the unwinding signals after the fourth unwinding signal.
In the above-described first embodiment (including the modified example), an example in which the wefts are generally delayed or advanced during the flying period has been described, but the present invention is not limited to this. For example, there may be a case where two wefts are inserted in the middle of the flying period. When two weft yarns are inserted from the middle of the flight period, the flight curve becomes similar to the flight curve M6 indicated by the two-dot chain line in FIG. can be done.
○ In the above-described first embodiment (including modifications), the release signal of the balloon sensor 20 at timing Tb2 is used as the first sensor signal, and the release signal of the balloon sensor 20 at timing Tb3 is used as the second sensor signal. and the arrival signal of the end sensor 26 at the timing TW as the third sensor signal, but the third sensor signal is not limited to this. For example, a weft defect may be determined based only on the first sensor signal and the second sensor signal. The arrival signal of the weave width sensor 27) of the timing may be used.

10 weft inserting device 11 weft inserting nozzle 12 weft feeding section 13 weft length measurement storage device 14 reed 15 sub-nozzle 16 control device 17 display device 18 storage drum 20 balloon sensor 21 encoder 25 weft flight path 26 end sensor 27 weaving width sensor Y Weft TL Weaving width Tb1, Tb2, Tb3 Weft unwinding timing TW Weft tip arrival timing M1, M2, M3, M4, M5, M6 Flying curve S01, S02, S03, S04, S05, S06, S07 Step

Claims (3)

a weft inserting nozzle for inserting the weft into the weft flying path;
a balloon sensor for detecting unwinding of the weft from the weft length measuring and storage device;
a weft arrival sensor for detecting the arrival of the weft on the opposite side of the weft insertion nozzle on the weft flight path;
A weft defect determination device for a loom, comprising a loom rotation angle detection sensor that detects detection timings of detection signals of the balloon sensor and the weft arrival sensor, respectively,
Among a plurality of sensor signals including a plurality of unwinding signals detected by the balloon sensor and an arrival signal detected by the weft arrival sensor,
Any unraveling signal detected by the balloon sensor is defined as a first sensor signal,
A first range is set with respect to the detection timing of the first sensor signal,
A second range is set with respect to detection timing of a second sensor signal detected after the first sensor signal,
The second range is set larger than the first range,
a determination unit that determines that a weft defect has occurred when the detection timing of the first sensor signal and the detection timing of the second sensor signal exceed the corresponding first range and the second range, respectively. A weft defect determination device for a loom, characterized by: both the first sensor signal and the second sensor signal are unraveling signals detected by the balloon sensor;
An arrival signal detected after the second sensor signal and detected by the weft arrival sensor is defined as a third sensor signal,
A third range is set with respect to the detection timing of the third sensor signal,
The third range is set larger than the second range,
The determination unit determines the first range, the second range, and the detection timing of the third sensor signal, to which the detection timing of the first sensor signal, the detection timing of the second sensor signal, and the detection timing of the third sensor signal respectively correspond. 2. The weft defect determination device for a loom according to claim 1, wherein when the third range is exceeded, it is determined that a weft defect has occurred. the first sensor signal is the last unraveling signal among a plurality of unraveling signals detected by the balloon sensor;
2. A weft defect determination apparatus for a loom according to claim 1, wherein said second sensor signal is an arrival signal detected by said weft arrival sensor.

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