JP6319262B2 - Weft insertion control device for air jet loom - Google Patents

Description

  The present invention relates to a weft insertion control device in an air jet loom.

  In an air jet loom, a technique of providing a photoelectric sensor for detecting a weft within a woven width is known. For example, in Patent Document 1, the weft flying speed changes due to the change of the weft balloon from the drum of the weft length measuring storage device or the release resistance, and the occurrence of a weft insertion failure due to the excess or shortage of the weft length measurement amount occurs. In order to prevent this, a technique for automatically adjusting the retraction timing of the weft locking pin and the injection start timing of the weft insertion nozzle is disclosed.

  In patent document 1, the photoelectric sensor is installed in the detection position in the middle from the yarn supply end of a lane to the counter yarn supply end. The photoelectric sensor measures the arrival timing of the weft yarn that has reached the installation position of the photoelectric sensor. The measured value of the weft arrival timing by the photoelectric sensor or the moving average value of the measured values is compared with the standard arrival timing. Depending on the comparison result, the retraction timing of the weft locking pin or the injection start timing of the weft insertion nozzle is automatically adjusted.

  Even when the flying speed of the weft changes by adjusting the injection start timing at the weft locking pin or the weft insertion nozzle, the arrival timing of the weft to the non-feeding end depends on the pressure of the weft insertion fluid and the injection end timing. It can always be set within the target range without changing.

JP-A-62-117853

  In the air jet loom, after the weft insertion by the weft insertion nozzle is started, the air injection of the auxiliary nozzle that conveys the weft yarn into the weaving width greatly affects the stability of the weft insertion. However, at the beginning of weft insertion, the effect of air injection by the weft insertion nozzle is large, and it is difficult to see the effect of the auxiliary nozzle air injection on the weft running state.

  As the speed of air jet looms increases, the flying speed of wefts has increased. Increasing the weft flying speed increases the impact on the weft at the end of weft insertion and causes problems such as weft breakage. Air jet looms generally use braking means to brake the weft before the end of weft insertion. Has been adopted.

  However, after the weft is braked by the brake means, the weft flying speed becomes uniform toward the weft insertion end timing, and it is difficult to see the influence on the weft running state by the air injection of the auxiliary nozzle. As in the technique disclosed in Patent Document 1, even if the photoelectric sensor is properly installed on the way from the yarn supply end to the reverse yarn supply end of the path, the weft yarn can be brought into a flying state by air injection of the auxiliary nozzle. It is difficult to see the effects accurately. For this reason, in the technique disclosed in Patent Document 1, the weft arrival timing detected by the photoelectric sensor installed on the way from the yarn supply end to the reverse yarn supply end of the road is effectively used for air injection control of the auxiliary nozzle. There is a fear that it cannot be used.

  It is an object of the present invention to make it possible to effectively use the weft detection timing detected by the weft-width weft sensor for air injection control of the auxiliary nozzle.

  Claim 1 is a weft insertion control device in an air jet loom comprising a weft insertion nozzle, a plurality of auxiliary nozzles, and a brake means for braking the weft yarn before the end of the weft insertion, wherein the weft insertion control device is a weaving control device. A weft-in-weft sensor installed in a weft flying path within the width, and a correction unit for correcting the injection start timing of the auxiliary nozzle, wherein the weft-in-weft sensor within the weave width is the air injection end timing of the weft insertion nozzle Is installed in the weft travel path between the weft tip position corresponding to the weft and the weft tip position corresponding to the brake timing of the brake means, and the correction unit is based on the weft detection timing of the weft sensor within the weaving width. A flying curve is estimated, and the injection start timing of the auxiliary nozzle is corrected according to the estimated weft flying curve.

  According to the first aspect of the present invention, the weft width in-weft sensor can detect the weft that is flying without being affected by the influence of the compressed air injected from the weft insertion nozzle and the effect of the braking of the weft by the brake means. Therefore, the air injection timing of the auxiliary nozzle can be set in accordance with the flying state of the weft yarn by the air injection of the auxiliary nozzle. For this reason, it is possible to set the air injection timing without waste for the sub valve of the auxiliary nozzle, and it is possible to reduce the consumption of compressed air.

  According to a second aspect of the present invention, the correction unit detects a difference between a weft detection timing of the weft width inner weft sensor and a timing of a weft tip reaching the position of the weft width inner weft sensor in a reference weft flight curve. The weft flying curve is estimated on the basis of this. According to claim 2, the estimated weft flying curve is accurately created based on the weft flying form that has been empirically and experimentally determined, and based on the deviation of the weft tip arrival timing detected in at least one location. can do.

  According to a third aspect of the present invention, the correction unit changes the air injection timing based on a weft flying curve estimated from an average value of weft detection timings of the weft sensor within the weaving width in a plurality of weft insertions. To do. According to the third aspect, since the weft flying curve is estimated based on the average deviation, the air injection timing of the auxiliary nozzle is not extremely changed, and stable weft insertion can be continued.

  According to a fourth aspect of the present invention, the correction unit changes an air injection start timing and an air injection end timing of the auxiliary nozzle based on the estimated weft flying curve. According to the fourth aspect, since both the air injection start timing and the air injection end timing of the auxiliary nozzle are adjusted, the injection period of the compressed air can be appropriately set according to the running state of the weft.

  In the present invention, the weft arrival timing detected by the weft width in-weft sensor can be effectively used for air injection control of the auxiliary nozzle.

It is the schematic which shows the weft insertion apparatus of the air jet loom in 1st Embodiment. It is a diagram which shows the relationship between the timing in a weaving width, and a position. It is a diagram which shows the flight curve of a weft, and the air injection timing of an auxiliary nozzle. It is a diagram which shows the weft flight curve estimated in 2nd Embodiment, and the air injection timing of the auxiliary nozzle after a change. It is a diagram which shows the other example of the air injection timing of the estimated weft flight curve and the auxiliary nozzle after a change.

(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. 1 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 storage device 4 is provided with a weft locking pin 9 for releasing and locking the weft Y and a balloon sensor 10 for detecting the release of the weft Y. In addition, arrangement | positioning of the weft locking pin 9 and the balloon sensor 10 in FIG. 1 is shown typically.

  The weft locking pin 9 and the balloon sensor 10 are arranged around the storage drum 8, and the balloon sensor 10 is arranged side by side in the state where the weft Y is released and close to the weft locking pin 9. 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. Release of the weft Y by the weft locking pin 9 is performed at the timing of starting weft insertion (weft insertion start timing IF, see FIG. 2).

  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 in a balloon state from the storage drum 8 during weft insertion, and transmits a weft release signal to the control device 16. The control device 16 operates the weft locking pin 9 when receiving a preset number of weft release signals. 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 by the number of times the weft Y having a length corresponding to the weaving width is wound around the storage drum. In this embodiment, for example, the length of the weft Y wound three times on the storage drum 8 corresponds to the weaving width. The control device 16 is set so that when the weft release signal of the balloon sensor 10 is received three times, an operation signal for locking the weft Y is transmitted to the weft lock pin 9.

  The weft insertion nozzle 2 includes a tandem nozzle 11 that draws out the weft Y of the storage drum 8 and a main nozzle 12 that wefts the Y into the weft travel path 6 and has a function of releasing the weft Y. The auxiliary nozzle 7 has a transport function for transporting the weft Y that has been inserted along the weft travel path 6. On the upstream side of the tandem nozzle 11, brake means 13 is provided for braking the flying weft Y before the end of weft insertion. The brake means 13 employs a known method such as a mechanical type or an air type.

  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 means 13, the weft length measuring and storage device 4 and the yarn feeding section 3 are a bracket (not shown) attached to a frame (not shown) or a floor (not shown) of an air jet loom. ) Etc.

  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. The weft detection signal of the end sensor 14 is a signal for reaching the weft Y to the weft end on the side opposite to the weft insertion side. In the control device 16, the weft insertion end timing IE ( This is recognized as the loom rotation angle of FIG.

  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 leading end of the weft Y inserted reaches the installation position YX of the weft width inner weft sensor 18. Then, it is recognized as the weft detection timing IS (see FIG. 2) detected by the weft width inner weft sensor 18.

  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 TL, 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 a 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 means 13 are respectively connected to the control device 16 and wirings 42, 43, 44, 45, 46, 47, 48 is electrically connected. In the control device 16, an operation timing, a brake timing BT (see FIG. 2), and an operation time for operating the main valve 22, the tandem valve 24, the sub valve 34, and the brake means 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 an operation timing earlier than the weft insertion start timing IF at which the weft locking pin 9 operates, and compressed air is supplied from the main nozzle 12 and the tandem nozzle 11. Be injected. An operation command signal is output from the control device 16 to the brake means 13 at a brake timing BT earlier than the weft insertion end timing IE in which the weft locking pin 9 is operated to lock the weft Y of the storage drum 8. The brake means 13 brakes the weft Y that travels at a high speed to reduce the travel speed of the weft Y, and relaxes the impact of the weft Y at the weft insertion end timing IE.

  A display device 49 having a display function and an input function is connected to the control device 16. The display device 49 can display, for example, the diagrams shown in FIGS. 2 to 5 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 position of the end sensor 14 within the weaving width TL, the weft tip position YE where the tip of the weft Y reaches the air injection end timing ME of the weft insertion nozzle 2, and the brake timing BT of the brake means 13. Shows the weft tip position YB where the tip of the weft Y reaches and the arrangement position YX of the weft sensor 18 within the weaving width, and (b) shows the weft insertion start timing IF and the air injection end timing of the weft insertion nozzle 2 within the weaving width TL. The ME, the weft detection timing IS of the weft width inner weft sensor 18, the brake timing BT of the brake means 13, and the weft insertion end timing IE detected by the end sensor 14 are shown.

  The weft insertion start timing IF indicates the timing when the weft locking pin 9 is actuated by a command from the control device 16 and the weft Y is released. The weft insertion start timing IF can be grasped from the rotation angle signal of the encoder 17. Hereinafter, each timing is similarly grasped by the rotation angle signal of the encoder 17.

  The weft insertion end timing IE indicates the weft detection signal generation timing by the end sensor 14, and is the timing at which the weft locking pin 9 locks the weft Y. The air injection end timing ME of the weft insertion nozzle 2 is preset in the control device 16 so that the compressed air injected from the main nozzle 12 and the tandem nozzle 11 stops after a certain time from the start of injection.

  The brake timing BT is preset in the control device 16 so that the flying weft Y is braked before the weft insertion end timing IE. The weft width inner weft sensor 18 is installed in the weft travel path 6 within the weaving width TL so that the weft Y can be detected between the air injection end timing ME of the weft insertion nozzle 2 and the brake timing BT of the brake means 13. ing.

  Specifically, during weft insertion, the weft width inner weft sensor 18 detects the weft tip position YE corresponding to the air injection end timing ME of the weft insertion nozzle 2 and the weft tip position corresponding to the brake timing BT at which the brake means 13 operates. It is installed in the weft flying path 6 between YB. As will be described later, the weft tip positions YE and YB are substantially constant regardless of the difference in the air injection pressure of the auxiliary nozzle 7.

  In the weft travel path 6 between the weft tip position YE corresponding to the air injection end timing ME and the weft tip position YB corresponding to the brake timing BT, the weft Y is conveyed only by compressed air injected from the auxiliary nozzle 7. Has been. The weft travel path 6 in which the weft width inner weft sensor 18 is installed is an area in which the weft Y travels without being affected by the compressed air injected from the weft insertion nozzle 2 and the braking effect by the brake means 13. .

  FIG. 3 shows the weft flying curves acquired in advance by trial weaving and stored in the control device 16, and three types of weft flying curves A, B, and C are displayed as an example. Each weft flying curve A, B, C is an actual weft flying curve obtained by weft insertion with different pressures of the compressed air of the auxiliary nozzle 7. In the actual weft insertion control device of an air jet loom, a large number of weft flying curves are stored in the control device 16 to perform weft insertion control.

  During the operation of the loom, the weft width in-weft sensor 18 detects the weft Y at all times or periodically, and a weft detection signal is transmitted to the control device 16. The control device 16 detects the weft detection timing IS of the weft Y that has reached the arrangement position YX of the in-weft width weft sensor 18, and in the stored weft flying curves A, B, C, the weft width in-weft sensor 18 Are compared with the timings A1, B1, and C1 at which the arrangement position YX is reached. In the example of FIG. 3, since the weft detection timing IS coincides with the timing A1, the control device 16 estimates that the weft flying curve A is the current flying curve.

  The weft insertion control in this embodiment will be specifically described below. In FIG. 3, the weft flying curve A is when the weft insertion is performed with the air injection pressure of the auxiliary nozzle 7 being the highest. The weft flying curve B is when the weft insertion is performed with the air injection pressure of the auxiliary nozzle 7 being set to the lowest. The weft flying curve C is a case where weft insertion is performed by the air injection pressure of the auxiliary nozzle 7 which is intermediate between the weft flying curve A and the weft flying curve B.

  In the weft flying curve A, the tip of the weft Y reaches the arrangement position YX of the weft sensor 18 within the weaving width at the timing A1. In the weft flying curve B, the front end of the weft Y reaches the arrangement position YX of the weft sensor 18 within the weaving width at the timing B1. When the weft flying curve A and the weft flying curve B are compared, an angle difference α is generated between the timing A1 and the timing B1. However, there is a clear difference compared with the angle difference β between the timing A2 of the weft flying curve A and the timing B2 of the weft flying curve B between the brake timing BT and the weft insertion end timing IE.

  The difference between the angle difference α and the angle difference β occurs because the flying weft is braked by the brake means 13 after the brake timing BT. Therefore, before the brake timing BT, the influence of the air injection pressure of the auxiliary nozzle 7 clearly appears as the angle difference α. On the other hand, after the brake timing BT, the braking action by the brake means 13 acts in a direction that cancels the influence of the difference in the air injection pressure of the auxiliary nozzle 7, so that the angle difference β becomes smaller than the angle difference α. Even before the air injection end timing ME of the weft insertion nozzle 2, the influence due to the air injection pressure of the weft insertion nozzle 2 is larger than the influence due to the difference in the air injection pressure of the auxiliary nozzle 7, so that the weft flying curves A, B, C No difference is likely to occur between the weft arrival timings at the weft tip position YE. That is, the flying state of the weft Y between the air injection end timing ME and the brake timing BT clearly shows a change due to the air injection effect of the auxiliary nozzle 7.

  In the flying state of the weft Y, a large deviation occurs as shown by a weft flying curve A to a weft flying curve C by changing the air injection pressure of the auxiliary nozzle 7. Therefore, the conventional air injection timing of the auxiliary nozzle 7 is set so as to cover all the flying states of different wefts Y.

  Conventionally, the air injection start timing D1 is set for each sub valve 34 so as to include the timings A1 and A2 of the weft flying curve A where the weft Y reaches the air injection position of the auxiliary nozzle 7 earliest. Further, the air injection end timing D2 is set so that the air injection time of the auxiliary nozzle 7 is constant regardless of the difference in the air injection pressure of the auxiliary nozzle 7.

  In the first embodiment, a plurality of weft flying curves A to C are stored in the control device 16, and the weft Y is detected by the weft sensor 18 within the weaving width during the operation of the air jet loom, and the weft detection timing IS. Is detected by the control device 16. When the weft detection timing IS is, for example, timing A1, the control device 16 estimates that the weft flying curve A having the same timing as the timing A1 is the weft flying state in the current weft insertion. . When the weft detection timing IS does not coincide with any of the stored timings A1, B1, and C1 of the plurality of weft flying curves A to C, the weft flying curve having the closest timing is determined as the current weft flying curve. It is estimated that.

  Therefore, the control device 16 as the correction unit maintains the air injection timing of the auxiliary nozzle 7 at the air injection start timing D1 and the air injection end timing D2 based on the air injection timing D that matches the weft flying curve A. When the weft detection timing IS is timing B1, the control device 16 selects the weft flying curve B at which the weft arrival timing to the arrangement position YX of the weft sensor 18 within the weaving width is the timing B1, and the auxiliary nozzle 7 Is corrected to the air injection timing according to the weft flying curve B.

  In the first embodiment, the weft sensor 18 within the weaving width detects the tip of the weft Y that travels without being affected by the compressed air injected from the weft insertion nozzle 2 and the braking of the weft by the brake means 13. Can be detected. For this reason, it is possible to correct the air injection timing D of the auxiliary nozzle 7 in accordance with the flying state of the weft that varies depending on the air injection pressure of the auxiliary nozzle 7. Therefore, it is possible to set the air injection timing with no waste for the sub valve 34 of the auxiliary nozzle 7 and to reduce the consumption of compressed air.

  In the first embodiment, by correcting both the air injection start timing D1 and the air injection end timing D2 of the auxiliary nozzle 7, the injection period of the compressed air is appropriately set according to the flying state of the weft Y. can do.

(Second Embodiment)
4 and 5 show 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, the weft flying curves E (see FIG. 4) and G (see FIG. 5) are estimated by calculation based on the weft detection timing IS detected by the weft sensor 18 within the weaving width.

  In the second embodiment, it is possible to always detect the tip position of the weft being weft-inserted by the weft sensor 18 within the weaving width. A weft flying curve E in FIG. 4 shows a weft flying curve estimated by calculation when the weft detection timing IS detected by the weft sensor 18 within the weaving width is the timing E1. Timing E1 is the timing S1 at which the tip of the weft reaches the position YX of the weft sensor 18 within the weaving width in the reference weft flying curve S preset in the control device 16 for starting the initial operation of the air jet loom. Compared with

  If there is a deviation between the timing E1 detected by the weft width inner weft sensor 18 and the timing S1 when the leading end of the weft reaches the arrangement position YX of the weft width inner weft sensor 18 on the reference weft travel curve S, the timing Based on the magnitude of the deviation of the E1 from the timing S1, the deviation of the timing of reaching the leading end of the weft yarn in another place of the weft flying path 6 is calculated, and the timings E2 to E4 are estimated. Note that the weft end position corresponding to the weft insertion start timing IF and the weft insertion end timing IE is set to be the same in an air jet loom that performs weaving with the same specifications. Further, the timings E2 to E4 can be easily estimated by calculation based on the flying form of the weft Y that has been empirically and experimentally grasped. By plotting the timing E1 and the other calculated timings E2 to E4, an estimated weft flight curve E is created.

  The air injection timing F of the auxiliary nozzle 7 is set in correspondence with the estimated weft flying curve E shown in FIG. Specifically, the air injection start timing F1 of the auxiliary nozzle 7 is corrected in accordance with the timings E1 to E4 of the weft flying curve E. Further, the air injection end timing F2 is corrected to the loom rotation angle after a certain time in accordance with the properties of the weft Y that forms the weft flying curve E. Note that the air injection end timing F2 may be set not by the loom rotation angle but by time by a timer or the like.

  The weft flying curve G shown in FIG. 5 shows an example in which the weft flying speed of the weft Y is slower than the weft flying speed of the weft Y in the reference weft flying curve S. Specifically, similarly to the weft flying curve E, the timing G1 is detected by the weft width in-weft sensor 18 as the weft detection timing IS.

  The timing G1 is compared with the timing S1 when the leading end of the weft reaches the position YX of the weft sensor 18 within the weaving width in the reference weft flying curve S. When there is a deviation between the timing G1 and the timing S1 of the reference weft flying curve S, the leading end of the weft in another place of the weft flying path 6 based on the magnitude of the deviation of the timing G1 from the timing S1. The arrival timing shift is calculated, and the timings G2 to G4 are estimated. By plotting the timing G1 and other calculated timings G2 to G4, the estimated weft flying curve G is created.

  The air injection start timing H1 of the auxiliary nozzle 7 is corrected according to the timings G2 to G4 of the weft flying curve G, and the air injection end timing H2 is a fixed time according to the properties of the weft Y of the weft flying curve G, Or it is corrected to the loom rotation angle after a certain time. At the air injection timing H of the auxiliary nozzle 7 in the weft flying curve G, the air injection start timing H1 can be set with no waste time relative to the air injection start timing of the reference weft flying curve S. The injection flow rate of the compressed air from the auxiliary nozzle 7 can be reduced while maintaining a stable flight state.

  In the second embodiment, the weft sensor 18 within the weaving width detects the tip of the weft Y that travels without being affected by the compressed air injected from the weft insertion nozzle 2 and the braking effect of the weft by the brake means 13. Can be detected. For this reason, similarly to the first embodiment, the air injection timings F and H of the auxiliary nozzle 7 can be corrected in accordance with the flying state of the weft yarn by the air injection of the auxiliary nozzle 7. Therefore, it is possible to set the air injection timing with no waste for the sub valve 34 of the auxiliary nozzle 7 and to reduce the consumption of compressed air.

  In the second embodiment, the estimated weft flying curve E and the weft flying curve G are detected at least at one timing E1, based on empirical and experimentally understood weft flying forms, Based on the deviation of G1, it can be accurately estimated and created. In the second embodiment, by adjusting both the air injection start timings F1 and H1 and the air injection end timings F2 and H2 of the auxiliary nozzle 7, the compressed air injection period is adjusted to the flying state of the weft Y. Can be set appropriately.

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

(1) The weft flying curve A to the weft flying curve C and the weft flying curves E and G shown in the first and second embodiments are, for example, in a plurality of weft insertions such as 100 times or 200 times. It can be estimated on the basis of the average value (including the moving average value) of timings A1, B1, E1 or G1 based on the detected weft detection signal of the weft width within weft sensor 18. In this embodiment, since the weft flying curves A to C, E, and G are estimated by average deviation, the air injection timing of the auxiliary nozzle 7 is not extremely changed, and stable weft insertion is continued. Can do.

(2) The weft flying curve A to the weft flying curve C and the weft flying curves E and G shown in the first and second embodiments are periodically created, and the air injection timing D of the auxiliary nozzle 7, F and H may be changed periodically. In this embodiment, since the air injection timings D, F, and H of the auxiliary nozzle 7 can be adjusted periodically, the weft insertion stability and the compressed air consumption reduction can be continuously maintained.

(3) The weft width in-weft sensor 18 shown in the first and second embodiments corresponds to the weft tip position YE corresponding to the air injection end timing ME of the weft insertion nozzle 2 and the brake timing BT of the brake means 13. If the weft travel path 6 is between the weft tip position YB, it may be installed at two or more positions. According to this embodiment, since the arrival of the tip of the weft Y that flies during weft insertion can be detected at a plurality of positions, the weft flying curve A to the weft flying curve closer to the actual flying state of the weft Y can be detected. The running curve C and the weft flying curves E and G can be estimated.

(4) Even if the air injection pressure of the auxiliary nozzle 7 is the same, the flying state of the weft Y may vary depending on the weft insertion or the operating environment of the air jet loom. For this reason, the air injection timings D, F, and H of the auxiliary nozzle 7 in the estimated weft flying curve A to the weft flying curve C and the weft flying curves E and G can be set with a margin. For example, the air injection start timings D1, F1, and H1 are set to timings earlier than the timings A1, B1, E1, or G1 of the estimated weft flying curve A to the weft flying curve C and the weft flying curves E and G. May be.

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 11 Tandem nozzle 12 Main nozzle 13 Brake means 14 End sensor 16 Control device 17 Encoder 18 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 devices A to C, E, G Weft flying curve A1, A2 Weft flying curve A timing B1, B2 Weft flying curve B Timing C1 Timing E1 to E4 in the weft flying curve C Timing G1 to G4 in the weft flying curve E Timing BT in the weft flying curve G Brake timing D, F, H Air injection timing D1, F1, H1 of auxiliary nozzle Air injection start timing D2, F2, H2 Auxiliary nozzle air injection end timing IE Weft insertion end timing IF Weft insertion start timing IS Weft insertion detection timing ME Weft insertion nozzle air injection end timing S Reference weft flying curve S1 Reference weft flying Timing TL on running curve Weft width Y Weft YB Weft tip position YE at brake timing Weft tip position YX at weft insertion nozzle air injection end timing Position of weft sensor within weft width

Claims (4)

A weft insertion control device in an air jet loom comprising a weft insertion nozzle, a plurality of auxiliary nozzles, and a brake means for braking the weft yarn before completion of the weft insertion,
The weft insertion control device includes a weft width in-weft sensor installed in a weft travel path within a weave width, and a correction unit for correcting the injection start timing of the auxiliary nozzle,
The weft width inner weft sensor is installed in the weft travel path between the weft tip position corresponding to the air injection end timing of the weft insertion nozzle and the weft tip position corresponding to the brake timing of the brake means,
The correcting unit estimates a weft flying curve based on the weft detection timing of the weft width within weft sensor,
A weft insertion control device for an air jet loom, wherein the injection start timing of the auxiliary nozzle is corrected according to the estimated weft flying curve.   The correction unit is configured to perform the weft skip based on a deviation between a weft detection timing of the weft in-weft sensor and a timing of a front end of the weft reaching the position of the weft sensor in the weave in a reference weft travel curve. The weft insertion control device for an air jet loom according to claim 1, wherein a running curve is estimated.   The said correction | amendment part changes the said air injection timing based on the weft flying curve estimated by the average value of the weft detection timing of the said weft width inside weft sensor in the weft insertion of multiple times, or characterized by the above-mentioned. A weft insertion control device for an air jet loom according to claim 2.   The said correction | amendment part changes the air injection start timing and the air injection end timing of the said auxiliary nozzle based on the said estimated weft flying curve, The any one of Claims 1-3 characterized by the above-mentioned. Weft insertion control device for air jet looms.

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