JP6135731B2 - Method of monitoring weft flying condition in air jet loom - Google Patents

Description

  The present invention relates to a method of monitoring a weft flying state in an air jet loom.

  The air jet loom stores the weft yarn of the yarn feeding section in the weft length measuring and storage device, releases the stored weft yarn by the weft insertion nozzle and starts the weft insertion, and the weft yarn inserted within the weaving width by the auxiliary nozzle And the weft insertion is completed. It is known to control the weft release and conveyance functions by the weft insertion nozzle and the auxiliary nozzle by grasping the weft flying state within the weaving width.

  For example, Patent Document 1 discloses a weft insertion control device for an air-jet loom intended to control weft insertion and prevent weft insertion failure without causing unnecessary increase in air consumption. ing. The air jet loom is configured so that wefts stored in a storage drum are wefted by air injection of a main nozzle for weft injection and an auxiliary nozzle arranged at predetermined intervals along a weft insertion path.

  In the weft insertion control device, at the time of weft insertion, a weft release sensor disposed in the vicinity of the storage drum detects the release time of the weft released from the storage drum. In addition, a weft arrival sensor installed at the weave end opposite to the main nozzle detects the arrival time of the weft thread that has been inserted into the counter weft insertion side. The injection pressure of the main nozzle is controlled so that the weft release time detected by the weft release sensor becomes a target value.

  In addition, the auxiliary nozzle is controlled in jet pressure so that the time difference between the weft arrival time and the release time becomes a target value, thereby reducing the meandering of the weft during weft insertion. Further, when the amount of change in the time difference becomes equal to or less than a predetermined value due to the change in the injection pressure, the time difference at that time is changed to the target value, thereby suppressing an unnecessary increase in air consumption.

JP-A-4-240249

  In recent years, many high-speed air jet looms exceeding 1000 revolutions per minute are in operation. In an air jet loom operating at high speed, the weft flying speed is high, so that the impact at the end of weft insertion is increased, and the possibility of weft cutting due to the impact increases. In order to alleviate the impact at the end of the weft insertion, a brake means for braking the flying weft is generally adopted before the end of the weft insertion.

  In an air jet loom provided with a brake means, the weft flying state after braking until the end of weft insertion is less likely to appear due to the type of weft and the difference in the injection pressure of the weft insertion nozzle and the auxiliary nozzle. Therefore, as in the weft insertion control device disclosed in Patent Document 1, in the method of detecting the time difference between the weft insertion time and the weft release time from the storage drum, the weft arrival time is determined by Since it is detected after braking by means, the difference in time difference due to the type of weft and the injection pressure of the weft insertion nozzle and the auxiliary nozzle hardly appears, and it is difficult to accurately grasp the running state of the weft.

  An object of the present invention is to accurately monitor the flying state of the weft.

  The first aspect of the present invention provides a weft storage drum having a weft storage drum, a weft locking pin for releasing and locking the weft, and a balloon sensor for detecting the release of the weft, a weft insertion nozzle, and a plurality of auxiliary nozzles. In the weft running state monitoring method in an air jet loom comprising a brake that brakes the weft before the end of weft insertion, and a weft width in-weft sensor installed in a weft running path within the weaving width, A sensor is installed upstream of the weft tip position corresponding to the brake start timing of the brake in the weft insertion direction, the weft intermediate arrival timing based on the weft detection signal of the weft sensor within the weaving width, and the weft release of the balloon sensor A weft release timing at which the weft is released from the storage drum by a length from the end of the weave grasped based on the signal to the installation position of the weft sensor within the weave width; Characterized by monitoring the flying run state of the weft by the timing difference.

  According to the first aspect of the present invention, since the flying weft is detected without the influence of the brake before the end of the weft insertion, the type of the weft, the weft insertion nozzle and the auxiliary nozzle are not affected by the braking by the brake. It is possible to grasp the difference in the flying state of the weft due to the difference in the injection pressure. Accurate grasp of the difference in the weft flying state can be used for various controls of the weft insertion function, and can contribute to the improvement of the weft insertion performance of the air jet loom.

  According to a second aspect of the invention, the weft width in-weft sensor is installed at an ideal weft tip position when the N-th weft release signal of the balloon sensor is closest to the brake start timing of the brake. According to the second aspect, since it is only necessary to take the timing difference between the N-th weft release signal (weft release timing) of the balloon sensor and the weft intermediate arrival timing, it is not necessary to estimate the weft release timing and the control is easy. .

  According to a third aspect of the present invention, a plurality of the weft width in-weft sensors are installed in the weft travel path upstream of the weft tip position at the brake start timing of the brake. According to the third aspect, it is possible to contribute to the improvement of the weft insertion performance of the air jet loom by grasping the actual flying state of the weft yarn at a plurality of positions within the weaving width.

  The present invention can accurately monitor the flying state of the weft.

(A) Schematic diagram showing a weft insertion device of an air jet loom according to the first embodiment, (B) Schematic diagram of a storage drum showing the positional relationship between a weft locking pin and a balloon sensor. It is a diagram which shows the various timings within a weaving width | variety, and the weft end arrival position. It is a diagram which shows the flying curve of a weft. It is a diagram which shows the timing difference of the weft middle arrival timing and the weft release timing. It is the schematic which shows the principal part of the weft insertion apparatus in 2nd Embodiment. It is a diagram which shows the various timings in the woven width in other embodiment, and the weft front end | tip arrival position.

(First embodiment)
A first embodiment will be described with reference to FIGS. In the present specification, the weft is inserted into the warp opening, and the side opposite to the weft insertion direction with respect to the weft insertion direction in which the weft is conveyed is the upstream side, and the weft insertion side is the downstream side. Further, with respect to the direction in which the compressed air flows, the source stream side is upstream and the opposite side of the source stream is downstream.

  FIG. 1A shows a weft insertion device 1 of an air jet loom. The weft insertion device 1 is disposed on the downstream side of the weft insertion nozzle 2, the weft Y feeding portion 3 disposed on the upstream side of the weft insertion nozzle 2, the weft length measuring storage device 4, and the weft insertion nozzle 2. It consists of a plurality of auxiliary nozzles 7 arranged along a weft 5 consisting of a plurality of reed wings and a weft flying path 6 of the reed 5.

  The weft Y of the yarn supplying section 3 is drawn out by the rotation of a winding arm (not shown) of the weft length measuring and storing device 4 and is wound and stored on the storage drum 8. The weft length measuring and storing device 4 is provided with a weft locking pin 9 and a balloon sensor 10 for detecting the release of the weft Y. As shown in FIG. 1B, the weft locking pin 9 and the balloon sensor 10 are disposed around the storage drum 8, and the balloon sensor 10 releases the weft Y with respect to the weft locking pin 9 (arrow). It is arranged side by side on the direction reference) side. The weft locking pin 9 is electrically connected to the control device 16 via the wiring 20 and releases the weft Y stored in the storage drum 8 at a loom rotation angle preset in the control device 16. The timing at which the weft Y is released by the weft locking pin 9 is the weft insertion start timing.

  The balloon sensor 10 is electrically connected to the control device 16 through a wiring 21. The balloon sensor 10 detects the weft Y that is released from the storage drum 8 during weft insertion, and transmits a weft release signal to the control device 16. When the control device 16 receives a weft release signal for a preset number of times (set to 3 in this embodiment), the control device 16 operates the weft locking pin 9. The weft locking pin 9 locks the weft Y released from the storage drum 8 and ends the weft insertion.

  The operation timing for the weft locking pin 9 to lock the weft Y is set according to the number of windings required to store the weft Y having a length corresponding to the weaving width in the storage drum 8. In the present embodiment, since the length of the weft Y wound three times on the storage drum 8 corresponds to the weaving width, the control device 16 locks the weft Y when receiving the weft release signal of the balloon sensor 10 three times. The operation signal is set to be transmitted to the weft locking pin 9. The weft detection signal of the balloon sensor 10 is a release signal of the weft Y from the storage drum 8 and is recognized by the control device 16 as the weft release timing based on the loom rotation angle signal obtained from the encoder 17.

  The weft insertion nozzle 2 includes a tandem nozzle 11 for drawing out the weft Y of the storage drum 8 and a main nozzle 12 for weft insertion of the weft Y into the weft flying path 6. The weft Y is released from the storage drum 8 and the weft flying is performed. It has a function to send to the path 6. The auxiliary nozzle 7 has a transport function for transporting the sent weft Y along the weft flying path 6. A brake 13 is provided on the upstream side of the tandem nozzle 11 to brake the flying weft Y before the end of weft insertion. The brake 13 employs a known configuration such as a mechanical brake or an air brake.

  The main nozzle 12, the auxiliary nozzle 7 and the rod 5 are disposed on a slay (not shown), and are reciprocally swung in the front-rear direction of the air jet loom. The tandem nozzle 11, the brake 13, the weft length measuring and storage device 4 and the yarn supplying section 3 are a bracket (not shown) attached to a frame (not shown) or a floor surface (not shown) of an air jet loom. Etc. are fixed.

  An end sensor 14 is disposed at the downstream end of the weft flying path 6. The end sensor 14 detects the weft Y that has reached the weave end opposite to the main nozzle 12 (counter weft insertion side). The end sensor 14 is electrically connected to the control device 16 through a wiring 15. The control device 16 detects the occurrence of a weft insertion failure based on the presence or absence of a weft detection signal from the end sensor 14. Further, the weft detection signal of the end sensor 14 is the arrival signal of the weft Y to the weft end on the opposite weft insertion side, and is recognized by the control device 16 as the weft insertion end timing based on the loom rotation angle signal obtained from the encoder 17. Is done.

  In the weft travel path 6 in the weaving width TL (see FIG. 2) upstream of the end sensor 14, an in-weaving width weft sensor 18 is installed. The weft width inner weft sensor 18 is electrically connected to the control device 16 by a wiring 19. The weft detection signal from the weft width inner weft sensor 18 is based on the loom rotation angle signal obtained from the encoder 17 in the control device 16, and the tip of the weft Y inserted has reached the installation position of the weft width inner weft sensor 18. This is recognized as the intermediate weft arrival timing.

  In the present embodiment, only one set of weft insertion devices 1 is shown, but it may be configured as a multicolor weft insertion device in which two or more sets are arranged. Further, the concept of the multi-color weft inserting device includes a case where a plurality of sets of weft inserting devices 1 for the same color weft Y are installed. The auxiliary nozzle 7 is commonly used for two or more sets of weft insertion devices 1.

  A main valve 22 that supplies and stops compressed air is connected to the main nozzle 12 by a pipe 23. A tandem valve 24 for supplying and stopping compressed air is connected to the tandem nozzle 11 by a pipe 25. The main valve 22 is connected to a main air tank 27 by a pipe 26. The tandem valve 24 is connected to a main air tank 27 common to the main valve 22 by a pipe 28. The main air tank 27 is connected via a main pressure gauge 29, a main regulator 30, an original pressure gauge 31, and a filter 32 to a common air compressor 33 installed in the fabric factory. In the main air tank 27, compressed air supplied from the air compressor 33 and adjusted to a set pressure by the main regulator 30 is stored. The pressure of the compressed air supplied to the main air tank 27 is always detected by the main pressure gauge 29.

  The auxiliary nozzles 7 are divided into six groups as an example, and each group has four auxiliary nozzles 7. Six sub-valves 34 are arranged corresponding to each group, and the auxiliary nozzles 7 of each group are connected to the respective sub-valves 34 by pipes 35. The auxiliary nozzles 7 are not limited to six groups, and a plurality of groups can be provided according to the weaving width, and a plurality of sub-valves 34 can be provided corresponding to each auxiliary nozzle group. Each sub valve 34 is connected to a common sub air tank 36.

  The sub air tank 36 is connected to a sub regulator 39 via a sub pressure gauge 38 by a pipe 37. The sub-regulator 39 is connected to a pipe 41 that connects the main pressure gauge 29 and the main regulator 30 by a pipe 40. In the sub air tank 36, compressed air supplied from the air compressor 33 and adjusted to the set pressure by the sub regulator 39 is stored. The pressure of the compressed air supplied to the sub air tank 36 is always detected by the sub pressure gauge 38.

  The main valve 22, the tandem valve 24, the sub valve 34, the original pressure gauge 31, the main pressure gauge 29, the sub pressure gauge 38, and the brake 13 are respectively connected to the control device 16 and wirings 42, 43, 44, 45, 46, 47, 48. Are electrically connected. In the control device 16, the operation timing and the operation period for operating the main valve 22, the tandem valve 24, the sub valve 34 and the brake 13 are set in advance. Further, the control device 16 receives detection signals from the original pressure gauge 31, the main pressure gauge 29, and the sub pressure gauge 38.

  An operation command signal is output from the control device 16 to the main valve 22 and the tandem valve 24 at a timing earlier than the weft insertion start timing at which the weft locking pin 9 operates, and compressed air is injected from the main nozzle 12 and the tandem nozzle 11. The An operation command signal is output from the control device 16 to the brake 13 at an earlier timing than the weft insertion end timing at which the weft locking pin 9 is operated to lock the weft Y of the storage drum 8. The brake 13 brakes the weft Y that travels at a high speed to reduce the travel speed of the weft Y, and reduces the impact of the weft Y at the weft insertion end timing.

  A display device 49 having a display function and an input function is attached to the control device 16. The display device 49 can display, for example, the diagram shown in FIGS. 2 to 4 or other various display items and data on a display screen (not shown), and displays the data of the displayed display items. New input and rewriting are possible on the screen.

  2, (a) shows the arrangement positions of the end sensor 14 and the weft sensor 18 within the weaving width TL, and (b) shows the weft release timings B1, B2, B3 of the balloon sensor 10 within the weaving width TL. The weft intermediate arrival timing IS of the weft width inner weft sensor 18, the weft insertion end timing IE of the end sensor 14, and the brake start timing BT of the brake 13 are shown.

  In FIG. 2A, positions L, 2L and 3L are the leading ends of the weft Y corresponding to the weft storage length of one, two and three turns of the storage drum 8 from the weave end of the weaving width TL. Indicates the position. When the weft Y flies without loosening, the tip of the weft Y is positioned at the positions L, 2L at the weft release timings B1, B2, B3 when the balloon sensor 10 generates the first, second, and third weft release signals, respectively. In the present specification, the positions L, 2L, and 3L are hereinafter referred to as ideal weft tip positions.

  In FIG. 2B, weft release timings B1 to B3 indicate the loom rotation angles based on the first, second and third weft release signals in the balloon sensor 10, respectively. The loom rotation angle can be grasped from the rotation angle signal of the encoder 17 when the weft release signal is generated. Hereinafter, the loom rotation angle at various timings is similarly grasped by the rotation angle signal of the encoder 17.

  The weft insertion end timing IE indicates the loom rotation angle when the end sensor 14 generates a weft detection signal. The brake start timing BT is a loom rotation angle that is set in advance in the control device 16 so that the braking of the weft Y is started before the weft insertion end timing IE.

  The weft width inner weft sensor 18 is a weft width estimated from the tip position BL of the weft Y corresponding to the brake start timing BT at which the brake 13 starts to operate during weft insertion, that is, the brake start timing BT and the speed of the weft Y. It is installed upstream in the weft insertion direction from the tip position BL of the weft Y in the TL.

  In this embodiment, the weft width inner weft sensor 18 is installed at the ideal weft tip position 2L corresponding to the weft storage length of two turns of the storage drum 8 from the weave end of the weaving width TL. When the weft Y flies without loosening, the weft Y reaches the ideal weft tip position 2L at the weft release timing B3. Therefore, the weft intermediate arrival timing IS detected by the weft sensor 18 within the weft width is the weft release timing. Should match B3.

  However, when the injection pressure of the auxiliary nozzle 7 is low and the conveying performance of the auxiliary nozzle 7 is weaker than the weft release performance of the weft insertion nozzle 2, the weft Y that is flying is loosened, so the weft intermediate arrival timing IS is the weft release timing IS. It is delayed by a timing difference Δ from the timing B3. The flying state of the weft Y during weft insertion can be grasped by looking at the magnitude of the timing difference Δ between the weft intermediate arrival timing IS and the weft release timing B3. The third weft release timing B3 is the weft release timing immediately before the brake start timing BT of the brake 13.

  Therefore, the weft width inner weft sensor 18 can detect the flying state of the weft Y that is not affected by the braking action of the brake 13. Further, since it is only necessary to take the timing difference Δ between the third weft release signal (weft release timing B3) of the balloon sensor 10 and the weft intermediate arrival timing IS, the weft sensor 18 within the weft width is installed at the ideal weft tip position 2L. Compared with the case where it does not, estimation of the weft release timing as will be described later becomes unnecessary and control is easy.

  FIG. 3 shows a weft flying curve YF, the abscissa indicates the loom rotation angle, and the ordinate indicates the tip position of the weft Y in the weft insertion direction from the weft insertion start to the weft insertion end. The weft flying curve YF is created by plotting the timing data ST1 to ST5 in which the tip position of the weft Y is detected by the strobe at five locations within the weaving width TL.

  The timing data ST1 coincides with the weft insertion start timing (timing when the weft locking pin 9 releases the weft Y), and the timing data ST5 coincides with the weft insertion end timing IE. The weft release timing B1 is detected later than the timing data ST1 because the balloon sensor 10 is set so as to be shifted in the release direction of the weft Y from the weft locking pin 9 (see FIG. 1B).

  Between the brake start timing BT and the weft insertion end timing IE, a constant braking action is applied so that the weft Y is at a low speed. Therefore, depending on the type of the weft Y and the injection pressure of the weft insertion nozzle 2 and the auxiliary nozzle 7. The difference between the weft release performance of the weft insertion nozzle 2 and the weft conveyance performance of the auxiliary nozzle 7 is less likely to appear in the weft flying curve YF.

  The weft width in-weft sensor 18 in the present embodiment is installed at the ideal weft tip position 2L at the weft release timing B3 immediately before the brake start timing BT. Therefore, by using the weft intermediate reach timing IS, the brake 13 Without being affected by braking, it is possible to grasp the difference in the flying state due to the type of weft Y and the difference in the injection pressures of the weft insertion nozzle 2 and the auxiliary nozzle 7.

  Accordingly, by grasping the timing difference Δ between the weft intermediate arrival timing IS by the weft width inner weft sensor 18 and the third weft release timing B3 of the balloon sensor 10, the type of weft Y, the weft insertion nozzle 2 and the auxiliary nozzle 7 The difference in the weft flying state due to the difference in the injection pressure can be monitored. By grasping the timing difference Δ between the weft intermediate arrival timing IS and the weft release timing B3 and monitoring the weft flying state, the balance between the weft release performance by the weft insertion nozzle 2 and the weft conveyance performance by the auxiliary nozzle 7 is accurately determined. And can greatly contribute to the setting and control of the compressed air pressure and injection timing of the weft insertion nozzle 2 and the auxiliary nozzle 7.

  As an example of control of the weft insertion device 1 using the weft flying state monitoring based on the timing difference Δ between the weft intermediate arrival timing IS and the weft release timing B3, a method for setting the pressure of the compressed air injected from the auxiliary nozzle 7 Will be described with reference to FIG. AD1 is a curve showing a timing difference Δ between the weft intermediate arrival timing IS and the weft release timing B3. A curve AD1 shows the weft intermediate arrival timing IS and the weft when the injection pressure of the auxiliary nozzle 7 is changed variously in a state where the injection pressure of the weft insertion nozzle 2 is adjusted and the weft insertion end timing IE is kept constant. This is obtained by plotting the timing difference Δ with the release timing B3.

  On the other hand, the curve AD2 shows the weft release end timing calculated based on the weft insertion end timing IE detected by the end sensor 14 and the weft release signal of the balloon sensor 10 when the injection pressure of the auxiliary nozzle 7 is changed variously. The timing difference is plotted. As the weft release end timing, a weft release time from the release timing of the weft Y detected by the balloon sensor 10 to the weft locking pin 9 is set in advance, and when the third weft release signal of the balloon sensor 10 is reached. It is obtained by adding the weft release time to the timing.

  Since the curve AD2 is obtained based on the weft detection signal and the weft release signal after the operation of the brake 13 is started, the amount of change in the timing difference is small even if the injection pressure of the auxiliary nozzle 7 is changed. On the other hand, the curve AD1 has a larger amount of change in timing difference than the curve AD2. This is due to the difference between whether the weft arrival timing for obtaining the timing difference and the detection timing of the weft release timing are after the braking action of the weft Y by the brake 13 or before the braking action, and the curve AD1 indicates the type of weft Y and the weft insertion nozzle. 2 and the difference in the flying state due to the difference in the injection pressure of the auxiliary nozzle 7 are shown more clearly.

  Therefore, it is possible to clearly read the balance state between the weft release performance of the weft insertion nozzle 2 corresponding to the injection pressure of the auxiliary nozzle 7 and the weft conveyance performance of the auxiliary nozzle 7 by the curve AD1. For example, in the case of FIG. 4, the pressure at the position before the timing difference greatly changes in the curve AD <b> 1 can be set as the optimum pressure SP of the auxiliary nozzle 7.

  In addition, it is determined whether or not the stretch state of the weft Y is appropriate by adding a curve EA that plots the timing at which the weft Y stretches and does not loosen when the weft Y travels at each injection pressure. It is possible to grasp the optimum pressure SP.

(Second Embodiment)
FIG. 5 shows the second embodiment. The same components as those in the first embodiment will be described with the same reference numerals, and detailed description thereof will be omitted. In the second embodiment, weft-width weft sensors 18 and 50 are provided at two locations on the weft travel path 6 within the weave width TL. The weft width inner weft sensor 18 has the same configuration as that of the first embodiment.

  The weft width inner weft sensor 50 is installed at the ideal weft tip position L of the weft Y at the weft release timing B2 (see FIG. 2) based on the second weft release signal from the balloon sensor 10 in the weft travel path 6. . The position of the weft width inner weft sensor 50 is arranged upstream of the position of the weft width inner weft sensor 18 in the weft insertion direction. Further, the weft width inner weft sensor 50 is electrically connected to the control device 16 by a wiring 51.

  The weft width in-weft sensor 50 detects the weft Y before the brake start timing BT (see FIG. 2) at which the brake 13 starts to operate, so that it is not affected by the brake 13 and is the first embodiment. Similarly, it is possible to monitor the difference in the flying state of the weft Y due to the type of the weft Y and the difference in the injection pressures of the weft insertion nozzle 2 and the auxiliary nozzle 7. In addition, since weft Y can be detected at two locations by weft sensors 18 and 50 within the weaving width, it is possible to more accurately monitor the weft flying state and greatly contribute to the control of weft Y release performance and conveyance performance. can do.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications are possible within the scope of the gist of the present invention, and can be implemented as follows.

(1) In FIG. 6, (a) shows the arrangement positions of the end sensor 14 and the weft-inner weft sensor 18 within the weaving width TL, and (b) shows various timings within the weaving width TL. The weft width inner weft sensor 18 may be disposed at a position shifted from the ideal weft tip position 2L with respect to the third weft release timing B3 by the balloon sensor 10. In the embodiment of FIG. 6, the weft width in-wound sensor 18 is installed at a position X that is returned from the ideal weft tip position 2L by α in the weft insertion direction. The release weft length from the storage drum 8 is 2L-α, and the weft release timing BX when the ideal weft tip position coincides with the position X where the weft width inner weft sensor 18 is installed is estimated from the weft release timings B2 and B3. . The control device 16 grasps the flying state of the weft Y based on the timing difference Δ between the weft intermediate arrival timing IS and the weft release timing BX of the weft sensor 18 within the weaving width. In this case, the installation position of the weft sensor 18 within the weaving width is not limited to the ideal weft tip positions L and 2L corresponding to the weft release signal from the balloon sensor 10, and the degree of freedom of the installation position of the weft sensor 18 within the weaving width increases. .

(2) In the first, second, and other embodiments, the weft insertion nozzle 2 may have only the main nozzle 12 without providing the tandem nozzle 11.
(3) In the first embodiment, the weft width within-weft sensor 18 may be installed at the ideal weft tip position L, and the angle difference between the weft intermediate arrival timing IS and the second weft release timing B2 may be viewed. .

DESCRIPTION OF SYMBOLS 1 Weft insertion apparatus 2 Weft insertion nozzle 4 Weft measurement length storage apparatus 5 筬 6 Weft flight path 7 Auxiliary nozzle 8 Storage drum 9 Weft locking pin 10 Balloon sensor 11 Tandem nozzle 12 Main nozzle 13 Brake 14 End sensor 16 Control apparatus 17 Encoder 18, 50 Weft width in-weft sensor 22 Main valve 24 Tandem valve 27 Main air tank 30 Main regulator 34 Sub valve 36 Sub air tank 39 Sub regulator 49 Display device α Angle Δ Timing difference AD1, AD2, EA Curves B1-B3 Weft release timing BL Weft tip position BT Brake start timing IE Weft insertion end timing IS Weft intermediate arrival timing L, 2L, 3L Ideal weft tip position SP Optimum pressure of auxiliary nozzle ST1 to ST5 Strobe timing data TL Weaving width X Position of weft sensor within weft width Y Weft YF Weft flying curve

Claims (3)

Weft storage drum, weft lock pin for releasing and locking the weft, weft length measuring storage device having balloon sensor for detecting weft release, weft insertion nozzle, multiple auxiliary nozzles, and before weft insertion In the weft running state monitoring method in an air jet loom equipped with a brake for braking the weft and a weft sensor within the weaving width installed in the weft running path within the weaving width,
The weft width in-weft sensor is installed upstream of the weft tip position corresponding to the brake start timing of the brake in the weft insertion direction,
The weft drum intermediate arrival timing based on the weft detection signal of the weft width inner weft sensor, and the storage drum from the weaving end grasped based on the weft release signal of the balloon sensor to the installation position of the weft width inner weft sensor A weft running state monitoring method in an air jet loom characterized by monitoring a weft running state based on a timing difference from a weft releasing timing at which the weft is released.   2. The air jet according to claim 1, wherein the weft width inner weft sensor is installed at an ideal weft tip position when the N-th weft release signal of the balloon sensor is closest to the brake start timing of the brake. Weft running state monitoring method for looms.   3. The air according to claim 1, wherein a plurality of the weft width inner weft sensors are installed in a weft flight path upstream of the weft tip position at the brake start timing of the brake in the weft insertion direction. Weft running state monitoring method for jet looms.

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