JP2014101593A - Method and device for controlling number of revolutions of main shaft in water jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity while stably performing weft insertion by a plurality of weft insertion nozzles in a water jet loom which includes the plurality of weft insertion nozzles provided in parallel in the warp direction and one or more pumps provided so as to correspond to the plurality of weft insertion nozzles, and in which a beating device and a warp opening device are driven by using a main shaft as a driving source.SOLUTION: The number of revolutions of a main shaft is set so as to correspond to each of a plurality of weft insertion nozzles, and the number of revolutions is set so as to be different between for the weft insertion nozzle located closest to a cloth fell side and for the weft insertion nozzle located farthest from the cloth fell side among the plurality of weft insertion nozzles. During weaving, the number of revolutions of the main shaft is controlled according to the set number of revolutions so as to correspond to each weft insertion nozzle performing weft insertion.

Description

  The present invention has a plurality of weft insertion nozzles arranged side by side in the warp direction and one or more pumps provided corresponding to the plurality of weft insertion nozzles, and the beating device and the warp opening device have a main shaft. The present invention relates to a water jet loom driven as a drive source.

  Conventionally, as shown in Patent Document 1, a multi-color weft insertion water jet loom includes a plurality of weft insertion nozzles and one or more pumps provided corresponding to the plurality of weft insertion nozzles. Generally, in a water jet loom, the weft insertion nozzle is fixedly arranged with respect to the frame of the loom, and in the case of multiple colors, the weft insertion nozzle is provided in a state of being juxtaposed in the warp direction. It has been. Further, in a conventional water jet loom, it is common that the beating device and the warp opening device are driven using a main shaft as a drive source.

  Therefore, in the conventional multi-color weft insertion water jet loom, for each weft insertion nozzle, the relationship between the weft flight path inserted by each weft insertion nozzle and the warp opening movement or heel swinging movement Are different. More details are as follows.

  In terms of the relationship with the warp opening movement, the positions of the weft insertion nozzles fixedly arranged relative to the frame of the loom differ in the warp direction. For the weft insertion nozzle located near the front, the flight path passes through a position near the front of the weave, that is, a position where the opening amount of the warp opening (hereinafter also simply referred to as “opening amount”) is small. It becomes. On the other hand, for the weft insertion nozzle located at a position far from the weaving, the flying path passes through a position far from the weaving, that is, a position where the opening amount is large.

  In the water jet loom, since weft insertion is performed by transporting the weft yarn by the jet water jetted from the weft insertion nozzle, in order to make the weft insertion stable, It is desired that the water jetted into the warp opening does not significantly interfere with the upper and lower warps that form the warp opening over the weft insertion period. In other words, the opening amount of the warp opening needs to be maintained at a desired size or more in relation to the jet water over the weft insertion period. However, as described above, since the relationship between the passing position of the flying path and the opening amount differs for each weft insertion nozzle, the period during which the opening amount is maintained at a desired size or more (hereinafter referred to as “the latitude by the opening amount”). "Putable period" is different for each weft insertion nozzle. Specifically, the weft insertion nozzle located at a position close to the weaving direction in the warp direction has a shorter weft insertion period depending on the opening amount, and the weft insertion nozzle located at a position far from the weaving is a weft insertion period depending on the opening amount. Is longer.

  In relation to the oscillating movement of the reed, at the initial stage of weft insertion, weft insertion is started in the retreating process of the reed, but on the front side (front side of the reed) of the reed, the weft enters the warp opening. In order to insert the weft, naturally, the weft needs to be positioned on the front side opposite to the weft when the weft enters the warp opening. At the end of the weft insertion, the kite advances toward the front of the weave and engages with the weft, and then the weft is beaten by the kite toward the front of the weave. In this process, as the weft and the heel are engaged, the spray water sprayed from the weft insertion nozzle for transporting the weft is cut by the heel, so the transport force by the spray water on the weft disappears.

  In this way, the time when weft insertion can be started and the time when the conveying force for the weft disappears are determined in relation to the rocking motion of the kite. Will be the point of intersection. In the water jet loom, in a period from the time when the weft insertion can be started to the time when the weft yarn stops flying (hereinafter, referred to as “weft insertion possible period by heel movement”). Need to complete weft insertion. However, the weft insertion period due to the reed movement also differs for each weft insertion nozzle due to the difference in position in the warp direction. Specifically, weft insertion nozzles that are close to the weaving position in the warp direction have a longer weft insertion period due to the heel movement, and weft insertion nozzles far from the weaving period are the weft insertion period due to the heel movement. Is shorter.

JP 2003-313752 A

  As described above, in the water jet loom with multi-color weft insertion, the weft insertion period and the weft motion by the wrinkle movement are different for each weft insertion nozzle because the position of each weft insertion nozzle in the warp direction is different. The possible insertion periods (hereinafter, both are collectively referred to as “weft insertion possible periods”) are different. On the other hand, in the water jet loom, the flying speed of the weft thread inserted is determined by the pressure of the jet water. Therefore, unless the pressure of the jet water is changed, the flying time of the weft when one pick of weft is inserted is constant regardless of the rotational speed of the main shaft. Accordingly, in the multi-color weft insertion water jet loom, if the pressure of the jet water for each weft insertion nozzle is the same, the flight time in the weft insertion by each weft insertion nozzle is the same.

  By the way, the weft insertion period is determined by the warp opening movement and the wrinkle swinging movement. As described above, the warp opening apparatus for giving the warp opening movement and the punching apparatus for swinging the wrinkles. Is driven using the spindle as a drive source, the time length of the weft insertion period is inversely proportional to the rotation speed of the spindle. Therefore, when the flying speed is constant regardless of the rotational speed of the main shaft, it is necessary to keep the rotational speed of the main shaft low in order to perform stable weft insertion with a weft insertion nozzle having a short weft insertion period. There is.

  In the conventional general water jet loom, the rotational speed of the main shaft during weaving is basically constant. Therefore, in the conventional water injection loom with multi-color weft insertion, in order to stably perform the weft insertion by all the weft insertion nozzles, the rotation speed of the main shaft is a weft insertion nozzle with a short weft insertion period. It is set according to the weft insertion. In other words, even when weft insertion is performed with a weft insertion nozzle having a long weft insertion period, the loom is operated with the number of rotations of the main shaft being kept low. In this case, regarding the weft insertion by the weft insertion nozzle having a long weft insertion period, the time length of the weft insertion period determined by the rotational speed of the spindle is sufficient for the flying time. Therefore, the number of rotations of the main shaft is limited, and the improvement in productivity as a whole is limited.

  Some conventional multi-color weft insertion water jet looms are provided with a plurality of pumps so that the pressure of the jet water can be changed for each pump. According to this configuration, for example, the rotation speed of the main shaft is set to a high rotation speed according to the weft insertion by the weft insertion nozzle with a long weft insertion period, and the injection pressure is set for the weft insertion nozzle with a short weft insertion period. It is conceivable to increase the flight time to shorten the flight time. However, if the weft insertion by the weft insertion nozzle with a short weft insertion period with respect to the rotation speed of the high spindle is to be handled only by the pressure of the jet water, the pressure of the jet water must be greatly increased. This will damage the wefts that are used or limit the available wefts. In addition, since the load on the pump increases, the life of the pump is shortened.

  In view of the actual situation of the conventional water jet loom as described above, the present invention is a multi-color water jet type that can improve the productivity while performing the weft insertion by each weft insertion nozzle stably. It is an object to provide a loom.

  The present invention has a plurality of weft insertion nozzles arranged side by side in the warp direction and one or more pumps provided corresponding to the plurality of weft insertion nozzles, and the beating device and the warp opening device have a main shaft. A water jet loom driven as a driving source is assumed.

  The method for controlling the rotational speed of the main shaft according to the present invention in the water jet loom sets the rotational speed of the main shaft in a manner corresponding to each of the plurality of weft insertion nozzles, and among the plurality of weft insertion nozzles Different rotation speeds are set for the weft insertion nozzle located on the most weaving front side and the weft insertion nozzle located on the most anti-weaving front side, and during the weaving, the rotation speed of the main shaft is set so that the weft insertion is executed. Control is performed according to the set number of rotations according to the insertion nozzle.

  The spindle speed control device according to the present invention in the water jet loom includes a weft selection device that outputs a weft selection signal for each loom cycle during weaving according to the weft selection information set in advance by the water jet loom. A storage device for storing the number of rotations of the main shaft in a manner corresponding to each of the plurality of weft insertion nozzles, and the weft insertion according to the weft selection signal output from the weft selection device And a rotation speed controller that reads out the rotation speed corresponding to the nozzle from the storage device and controls the rotation speed of the spindle according to the read rotation speed.

  In the above description, the phrase “setting (storing) the rotational speed of the spindle in a manner corresponding to each of the plurality of weft insertion nozzles” means that the plurality of weft insertion nozzles are fixedly arranged at different positions in the warp direction. Therefore, it can be said that the rotational speed is set (stored) in a manner corresponding to the position of the weft insertion nozzle. That is, as described in the background art above, in the water jet loom, since the weft insertion period is different for each weft insertion nozzle that has a different position, considering the weft insertion period according to the position, That is, the rotational speed is set (stored). However, “in correspondence (setting / memory)” only indicates that the number of rotations is set for each weft insertion nozzle, and the position of each weft insertion nozzle in the warp direction It is not limited to the fact that all the different rotation speeds are set (stored) for each weft insertion nozzle according to the difference.

  In the present invention, the water jet loom includes three or more weft insertion nozzles and a plurality of pumps, and at least one of the plurality of pumps is less than the total number of the weft insertion nozzles. A plurality of weft insertion nozzles that are connected to the plurality of weft insertion nozzles arranged adjacent to each other, and of the three or more weft insertion nozzles, the weft insertion nozzle located closest to the weaving side and the most The weft insertion nozzle located on the front side of the weave has a configuration connected to the pump different from the above, and the rotation speed of the main shaft is set at the same rotation speed with respect to the weft insertion nozzle for each pump. It is good also as what is memorize | stored in a memory | storage device.

  That is, when the water jet loom is provided with three or more weft insertion nozzles and a plurality of pumps smaller than the number of weft insertion nozzles, a plurality of weft insertion nozzles are connected to at least one pump. However, in such a configuration, it is general to connect a plurality of weft insertion nozzles adjacent to each other to a common pump. When a plurality of weft insertion nozzles connected to the pump are considered as a nozzle group, the positions of the nozzle group and the weft insertion nozzles or nozzle groups connected to other pumps are different in the warp direction. Therefore, the relationship between the position in the warp direction and the weft insertion period can be applied even in units of nozzle groups. In addition, the same rotation speed may be set for a plurality of weft insertion nozzles that are connected to a common pump and are inserted under the same conditions.

  According to the present invention, in the water jet loom which is the above-mentioned premise, the rotational speed of the main shaft is set in a manner corresponding to each of the plurality of weft insertion nozzles, and the rotational speed of the main shaft is determined during weaving. Each of the weft insertion nozzles is controlled in accordance with the weft insertion period according to the position of each weft insertion nozzle in the warp direction. The weft insertion by the weft insertion nozzle is performed stably, and the time length of the weft insertion period has a margin in relation to the flight time, that is, in relation to the position in the warp direction. For a weft insertion nozzle with a long weft insertion period, productivity can be improved as a whole by setting a higher rotation speed than a weft insertion nozzle with a short weft insertion period.

  Further, according to the present invention, the water jet loom includes a plurality of pumps, and the nozzle group and the other nozzle groups or weft insertion nozzles having different positions in the warp direction are connected to different pumps. Further, since the pressure of the spray water can be changed for each pump, the productivity can be further improved by changing the pressure of the spray water in accordance with the control of the rotational speed. In addition, since the degree to which the pressure of the fountain is increased can be suppressed as compared with the one corresponding to the time length of the weft insertion period only by the pressure of the fountain, there is no limitation on usable wefts. In addition, weft insertion can be performed stably without damaging the weft yarn to be inserted. Furthermore, the load applied to the pump can be suppressed, and the life of the pump can be prevented from being shortened.

1 is an overall configuration diagram of a water jet loom. It is a figure which shows the relationship between several weft insertion nozzle and warp opening. It is a figure which shows the relationship between a some weft insertion nozzle and a collar. It is a figure which shows the relationship between the flight path of a weft, and the rocking | fluctuation of a kite.

  Embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 schematically shows the overall configuration of a water jet loom 1. In the water jet loom 1, a plurality of warps 3 drawn out in a sheet form from the warp beam 2 are turned toward the pre-weave 10 side by the back roller 4, and then a plurality of reed frames 6 in the warp opening device 5. A plurality of scissors 7 attached to the scissors 7 are inserted through the scissors 9 in the scissor driving device 8 and connected to the front of the fabric 10. As shown in the drawing, in the water jet loom 1 on which the present invention is based, the warp opening device 5 and the beating device 8 are connected to the main shaft 11 of the loom and driven by the rotational motion of the main shaft 11. That is, the main shaft 11 is used as a drive source. Then, the reed frame 6 in the warp opening device 5 and the reed 9 in the reed device 8 are driven according to a predetermined operation pattern in association with the rotation angle of the main shaft 11 during weaving.

  During weaving, the weft 13 is inserted into the opening of the warp 3 formed by the operation of the warp opening device 5 by the weft inserting device 12, and the weft 13 inserted in the weft 13 swings in the warp direction. The woven fabric 14 is formed by being struck (beated) by the fabric 9.

  Regarding the weft insertion device 12, in this embodiment, four weft insertion nozzles N1, N2, N3, and N4 as a plurality of weft insertion nozzles fixedly arranged on the loom frame 15 and these weft insertion nozzles are provided. And two pumps P 1 and P 2 as one or more pumps attached to the loom frame 15. Details are as follows.

  As shown in FIG. 2, the four weft insertion nozzles N1, N2, N3, and N4 are arranged on the warp row side with respect to the warp direction from the front of the weave 10 so as not to overlap in the warp direction. Has been. The weft insertion nozzles N1, N2, N3, and N4 are fixedly supported to the yarn supply side loom frame 15 by brackets or the like with their axes oriented in the weaving width direction. That is, the positions of the weft insertion nozzles N1, N2, N3, and N4 are fixed with respect to the loom frame 15. In the illustrated example, the weft insertion nozzles N1, N2, N3, and N4 are N1 on the most anti-weaving front 10 side, and are N2, N3, and N4 in order toward the front weaving 10 side.

  Although not shown in detail, the weft insertion nozzles N1, N2, N3, and N4 are supported by the loom frame 15 so that the direction of the axis with respect to the front of the weave 10 can be adjusted, and the injection direction can be adjusted. . With respect to the direction of the axis, in this embodiment, as shown in FIG. 3, the flying paths of the wefts 13 inserted by the weft insertion nozzles N1, N2, N3, and N4 are substantially the same position in the warp direction. It is set to go to. More specifically, assuming that the flight paths of the wefts 13 inserted by the weft insertion nozzles N1, N2, N3, and N4 are H1, H2, H3, and H4, respectively, the respective travel paths H1, H2, H3, and H4. The direction of the axis is set so as to go to one point outside the warp row on the counter feed yarn side.

  In the present embodiment, as described above, the two pumps P1 and P2 are provided as pumps for supplying the pressure water to the weft insertion nozzles N1, N2, N3, and N4. The two pumps P1 and P2 are fixedly provided on the outer surface of the loom frame 15 on which the weft insertion nozzles N1, N2, N3, and N4 are supported (not shown), and corresponding wefts are provided via a water supply pipe. The nozzles N1, N2, N3, and N4 are connected. In this embodiment, as shown, the pump P1 corresponds to the weft insertion nozzles N1 and N2, and the pump P2 corresponds to the weft insertion nozzles N3 and N4. Accordingly, in order to selectively supply the pressure water from the pumps P1 and P2 to one of the corresponding two weft insertion nozzles N1 and N2 and the weft insertion nozzles N3 and N4, the pump P1 and the weft insertion nozzles N1 and N2 The three-position switching valves V1 and V2 are provided in the respective paths of the water supply pipe connecting the two and the water supply pipe connecting the pump P2 and the weft insertion nozzles N3 and N4. The operation of the switching valves V1 and V2 is controlled according to a weft selection signal S output from a weft selection device 17 in a weft insertion control device (not shown).

  The weft selection device 17 outputs a weft selection signal S indicating the selected weft 13 for each loom cycle (every rotation of the main shaft 11) in accordance with the weft insertion order determined by a preset weft insertion pattern. . Then, according to the weft selection signal S from the weft selection device 17, each switching valve V1, V2 performs a switching operation. Specifically, for example, when the weft thread 13 to be inserted by the weft insertion nozzle N1 is selected, the switching valve V1 brings the weft insertion nozzle N1 and the pump P1 into communication with each other and the weft insertion nozzle N2. The pump P1 is switched so as to be in a non-communication state, while the switching valve V2 is switched so as to connect the pump P2 to a discharge passage (not shown) (not in communication with the weft insertion nozzles N3 and N4). . As a result, only the weft insertion nozzle N1 corresponding to the selected weft 13 is supplied with the pressure water from the pump P1, and as a result of the pressure water (spray water) being injected from the weft insertion nozzle N1, the selected weft 13 Weft insertion is executed.

  In the water jet loom 1 having the above-described configuration, in the present invention, the storage device 19 capable of storing the number of rotations of the main shaft 11 in a manner corresponding to each of the plurality of weft insertion nozzles and the weft selection device 17 output the result. The rotation of the main shaft 11 includes a rotation speed controller 20 that reads out the rotation speed corresponding to the weft insertion nozzle corresponding to the weft selection signal S from the storage device 19 and can control the rotation speed of the main shaft 11 according to the read rotation speed. A number controller 18 is included.

  The storage device 19 is connected to the rotation speed controller 20 so as to be communicable. The storage device 19 is connected to an input / setting display device 21 for setting the rotational speed of the main shaft 11. The storage device 19 stores a set value of the rotational speed of the spindle 11 corresponding to each of the plurality of weft insertion nozzles set (input) by the input / setting display device 21.

  The input / setting display device 21 is, for example, a touch panel type, a setting screen for setting the rotation speed of the spindle 11 corresponding to each of the plurality of weft insertion nozzles, and a setting value of the rotation speed of the spindle 11 The numeric keypad or the like for inputting numerical values can be read and displayed. This setting screen is, for example, an input setting field provided with a plurality of weft insertion nozzles mounted on the loom and corresponding to each of the plurality of weft insertion nozzles. (Hereinafter, also simply referred to as “rotational speed”) is configured to include a plurality of input setting fields. For setting the rotation speed for each input setting field, for example, select (touch) the input setting field to be set on the screen and enter the numerical value for the rotation speed setting value using the numeric keypad so that numerical input is possible. This can be done by entering the Further, the numeric keypad includes a determination button. When the determination button is selected when the input of the setting value is completed, the setting value is transmitted to the storage device 19 and stored in the storage device 19.

  The rotational speed controller 20 controls the driving of the main shaft motor 22 that rotationally drives the main shaft 11 to control the rotational speed of the main shaft 11. The rotational speed controller 20 includes the weft yarn in addition to the storage device 19. The selection device 17 is connected to be communicable. The rotational speed controller 20 includes, for example, an inverter device, and controls the rotational speed (rotational speed) of the spindle motor 22 that is an induction motor by changing the output frequency from the inverter device.

  Further, the rotational speed controller 20 receives the weft selection signal S output from the weft selection device 17, and in response to the weft selection signal S, the weft insertion corresponding to the weft selection signal S from the storage unit 19 is performed. The set value of the number of rotations set for the nozzle is read, and the inverter device outputs at a frequency corresponding to the read set value. Thereby, the spindle motor 22 is driven at a rotational speed according to the set value. Note that the output of the weft selection signal S from the weft selection device 17 is performed every cycle of the loom, and the rotation speed controller 20 reads the set value of the rotation speed every time the weft selection signal S is input. When the set value is changed, the output frequency is changed accordingly.

  In the present embodiment, as described above, the water jet loom 1 includes the four weft insertion nozzles N1, N2, N3, and N4 in the present embodiment. The rotation speed setting value is stored in a manner corresponding to each of the four weft insertion nozzles N1, N2, N3, and N4.

  The rotation speed is set in consideration of the weft insertion periods of the weft insertion nozzles N1, N2, N3, and N4 described in the background art. In this embodiment, It is assumed that the number of rotations is set in consideration of the latter of the above-described weft insertion period by the opening amount and the weft insertion period by the saddle movement. In this embodiment, the weft insertion possible period due to the saddle movement is specifically as follows.

  FIG. 4 shows the flying paths H1, H2, H3, and H4 of the wefts 13 inserted by the weft insertion nozzles N1, N2, N3, and N4, and the rod 9 that swings (reciprocates) in one cycle of the loom. It is a graph which shows the relationship. In the graph shown in FIG. 4, the vertical axis is the warp direction, and the horizontal axis is the rotation angle θ of the main shaft 11 (hereinafter also referred to as “crank angle θ”). Therefore, the straight lines indicating the flying paths H1, H2, H3, and H4 correspond to the positions of the leading ends in the warp direction of the respective wefts 13 at the respective crank angles θ after the weft insertion is started. Further, the curve (R) showing the swinging motion of the reed 9 corresponds to a line connecting the positions of the reed 9 in the warp direction at each crank angle θ.

  In FIG. 4, the vertical axis indicates the position of the fabric 10 and the most advanced position of the reed 9 as Y1, and the last retracted position of the reed 9 as Y2. FIG. 4 shows the weft insertion nozzles N1, N2, N3, and N4 according to their positions in the warp direction. That is, each weft insertion nozzle N1, N2, N3, N4 is provided between the front 10 (the most advanced position / Y1 of the reed 9) and the last retracted position (Y2) of the reed 9 in the warp direction, In this manner, N4, N3, N2, and N1 are arranged in order from the weft insertion nozzle closest to the weaving front 10, and are shown in a form corresponding to them.

  In the horizontal axis, one cycle of the loom from the crank angle θ = 0 ° to one rotation of the main shaft 11 (θ = 360 °) is shown, and each weft insertion nozzle N1, The crank angle θ at the start of weft insertion by N2, N3, and N4 is indicated as A, and the crank angle θ at the time when the tip of the weft 13 reaches the predetermined position on the counter yarn feeding side (the weft arrival time) is indicated as B. Yes. In the illustrated example, the weft insertion start points A by the weft insertion nozzles N1, N2, N3, and N4 are all set to the same crank angle θ. That is, considering only the relationship with the swing position of the reed 9, weft insertion can be started earlier in the weft insertion nozzle closer to the weaving front 10, but the relationship with the opening timing of the warp 3, etc. Therefore, the weft insertion nozzles N1, N2, N3, and N4 all start weft insertion of the weft 13 at the same time.

  In this embodiment, as described above, the direction (injection direction) of the axis of each weft insertion nozzle N1, N2, N3, N4 with respect to the weave 10 is determined by each weft insertion nozzle N1, N2, N3, N4. The flying path of the inserted weft 13 is set so as to be directed to substantially the same position in the warp direction. In the illustrated example, the tip of the weft 13 inserted by each weft insertion nozzle N1, N2, N3, N4. Are set so as to intersect with the rod 9 that swings toward the weave 10 at the same timing (crank angle θ = C). Accordingly, for each of the flying paths H1, H2, H3, and H4, the flying paths H1 and H2 are inclined from the position of the weft insertion nozzles N1 and N2 in the warp direction toward the weave 10 side, and the flying paths H3 and H4 are inclined from the position of the weft insertion nozzles N3 and N4 in the warp direction toward the anti-weave front 10 side.

  Regarding the curve R, the kite 9 strikes the weft 13 against the weave 10 at a crank angle θ = 360 ° (0 °). Therefore, the starting point of the curve R with respect to the horizontal axis is the crank angle. θ = 0 °, and the end point is the crank angle θ = 360 °. Further, since the rod 9 reaches the last retracted position at the crank angle θ = 180 °, the curve R reaches the position Y2 at the crank angle θ = 180 ° with respect to the vertical axis.

  From this graph, it is understood that the weft insertion possible period due to the saddle movement of each weft insertion nozzle N1, N2, N3, N4 in this embodiment is as follows.

  First, as described above, in this embodiment, each weft insertion nozzle N1, N2, N3, N4 is set to start weft insertion at the same crank angle θ = A. The start point of the weft insertion period by the saddle movement of N1, N2, N3, and N4 is the crank angle θ = A.

  On the basis of the weft insertion period by the weft movement of the weft insertion nozzles N1 and N2, the weft yarns 13 inserted by the weft insertion nozzles N1 and N2 have their flying paths H1 and H2 10 before weaving as described above. Since it is inclined toward the side, the front end interferes with the flange 9 on the rear end side before it intersects with the flange 9 at the crank angle θ = C. Therefore, the end point of the weft insertion period by the weft movement of the weft insertion nozzles N1 and N2 is the weft insertion by the weft insertion nozzles N1 and N2, and the wefts 13 connected to the weft insertion nozzles N1 and N2 are retreated at the rear end side. At the time of interference with the weft insertion nozzles N1 and N2 according to the position in the warp direction.

  In FIG. 4, when each of the wefts 13 interferes with the reed 9 on the rear end side, the dotted line drawn in parallel to the horizontal axis and the curve R at the position of the weft insertion nozzles N1 and N2 in the warp direction are This is the time at which the weft reaches and the crank angle θ at that time is shown as X1 and X2, respectively. That is, the weft insertion period by the weft movement of the weft insertion nozzles N1 and N2 is a period from A to X1 when the weft insertion nozzle N1 is at the crank angle θ, and the weft insertion nozzle N2 is A to X2 at the crank angle θ. As shown in the figure, since X2 at the crank angle θ is later than X1, the weft insertion period by the saddle movement is longer for the weft insertion nozzle N2 than for the weft insertion nozzle N1.

  On the other hand, during the weft insertion period by the weft movement of the weft insertion nozzles N3 and N4, as described above, the flying paths H3 and H4 of the weft yarns 13 inserted by the weft insertion nozzles N3 and N4 are on the 10th side before the anti-weaving. Since the weft 13 inserted by the weft insertion nozzles N3 and N4 interferes with the heel 9 at the tip before the rear end interferes. Accordingly, the weft insertion period by the weft movement of the weft insertion nozzles N3 and N4 is the time when the tip of the weft 13 intersects with the reed 9, that is, the crank angle θ = C is the end point, and the period of A to C in the crank angle Become. As shown in the figure, the crank angle θ = C is a time point after the crank angle θ = X1, X2, which is the end point of the weft insertion period due to the saddle movement of the weft insertion nozzles N1, N2. The weft insertion possible period due to the weft movement of the weft insertion nozzles N3, N4 is longer than the period during which weft insertion is possible due to the saddle movement of the weft insertion nozzles N1, N2.

  Therefore, in this embodiment, in consideration of the above-described weft insertion possible period due to the saddle movement, in the weft insertion by the weft insertion nozzles N1 and N2, the weft insertion possible period due to the saddle movement is shorter than the weft insertion nozzles N3 and N4. As will be described later, the loom cycle in which weft insertion is performed by the weft insertion nozzles N1 and N2 is performed in order to increase the time length of the weft insertion period by the dredging movement so that the weft insertion is performed stably. The rotational speed of the main shaft 11 is set lower than the loom cycle in which weft insertion is performed by the weft insertion nozzles N3 and N4.

  Incidentally, the weft insertion period according to the opening amount described in the background art described above is proportional to the position of the weft insertion nozzle in the warp direction, and in the case of this embodiment, it is closest to the pre-weave 10 in the warp direction. The weft insertion nozzle N4 at the position is the shortest, and the weft insertion nozzle N1 at the position farthest from the weave 10 is the longest. That is, the opening amount of the warp 3 is smaller as it is closer to the weave 10 and increases as it is further away from the weave 10 side, and the period during which the opening is maintained so that weft insertion is stably performed is Since it becomes shorter as it is closer to 10, the weft insertion possible period depending on the opening amount becomes gradually longer in the order of the weft insertion nozzles N4 to N3, N2, and N1. Therefore, when the number of rotations of the main shaft 11 is set in consideration of the weft insertion possible period depending on the opening amount, the number of rotations set for the weft insertion nozzle N1 located farthest from the front of the weave 10 at least in the warp direction. Is set to a value higher than the number of rotations corresponding to the weft insertion nozzle N4 located closest to the weave 10.

  Further, in the water jet loom 1 of this embodiment, as described above, the weft insertion nozzles N1, N2 of the four weft insertion nozzles N1, N2, N3, N4 are connected to the common pump P1, and the weft insertion Nozzles N3 and N4 are connected to a common pump P2. That is, in relation to the arrangement of the four weft insertion nozzles N1, N2, N3, and N4 in the warp direction, the weft insertion nozzle N1 that is located closest to the anti-weaving front 10 side and the weft insertion that is adjacent to the weft insertion nozzle N1 The nozzle N2 is connected to the pump P1, and the weft insertion nozzle N4 located closest to the weave 10 and the weft insertion nozzle N3 adjacent to the weft insertion nozzle N4 are connected to the pump P2. . In other words, the weft insertion nozzles N1 and N2 connected to the pump P1 are positioned closer to the front side 10 than the weft insertion nozzles N3 and N4 connected to the pump P2.

  In addition, in the present embodiment, with regard to the setting of the rotation speed, the same rotation speed is set for the weft insertion nozzles N1 and N2 connected to the pump P1, and the weft insertion nozzles N3 and N4 connected to the pump P2. Are set to the same rotational speed.

  That is, the weft insertion nozzles N1 and N2 connected to the common pump P1 are disposed adjacent to each other and are wefted under the same conditions (pressure of spray water, injection start time). Therefore, it can be regarded as one nozzle group (nozzle group G1). Similarly, the weft insertion nozzles N3 and N4 connected to the common pump P2 are also arranged adjacent to each other, and weft insertion is performed under the same conditions (pressure of spray water, injection start time). Since it is performed, it can be regarded as one nozzle group (nozzle group G2).

  Therefore, in this embodiment, the rotation speed is set for each nozzle group. In other words, in this embodiment, the same rotational speed is set for the weft insertion nozzle for each pump. Further, regarding the rotational speed set for the nozzle group G1 (weft insertion nozzles N1, N2) and the nozzle group G2 (weft insertion nozzles N3, N4), the arrangement of the nozzle groups in the warp direction and the above-described wrinkle movement In this embodiment, the rotation speed n1 is set for the nozzle group G1 far from the weaving front 10, and the rotation speed n2 is set for the nozzle group G2 near the weaving front 10 in this embodiment. Shall be. However, the set rotation speed n1 is lower than the set rotation speed n2, and the weft insertion by the weft insertion nozzle N1 with a short weft insertion period due to the saddle movement of the weft insertion nozzles N1 and N2 is stable. Set to be done. On the other hand, the set rotation speed n2 is higher than the set rotation speed n1, and the weft insertion by the weft insertion nozzle N3, which has a short weft insertion period due to the saddle movement of the weft insertion nozzles N3 and N4, is stable. Set to be done.

  In the water jet loom 1 of the present embodiment, since the nozzle group G1 and the nozzle group G2 are connected to different pumps (pumps P1, P2), the pressure of the jet water can be set independently. Therefore, in the present embodiment, in consideration of productivity, the pressure p1 of the jet water of the pump P1 is set so that the difference of the set speed n1 with respect to the higher set speed n2 is smaller. It is assumed that the pressure is set higher than the pressure p2.

  As described above, in the present embodiment, the rotational speed of the spindle 11 is stored in the memory 19 in a manner corresponding to each of the four weft insertion nozzles N1, N2, N3, and N4 in consideration of the weft insertion possible period due to the saddle movement. As a result of considering the weft insertion possible period due to the scissors movement, it is relative to the weft insertion nozzles N1 and N2 included in the nozzle group G1 located on the side far from the weave 10 A low set rotational speed n1 is set and stored, and a relatively high set rotational speed n2 is set and stored for the nozzle group G2 located on the side closer to the weave 10. That is, the rotational speed of the main shaft 11 set and stored for each weft insertion nozzle N1, N2, N3, N4 takes into account the positional relationship of each weft insertion nozzle N1, N2, N3, N4 in the warp direction. It is set in units of nozzle groups G1 and G2.

  In addition, the rotational speed controller 20 stores a storage device when the weft selection signal S corresponds to the weft insertion nozzle N1 or N2 according to the weft selection signal S output from the weft selection device 17. The set rotational speed n1 is read from 19 and when it corresponds to the weft insertion nozzle N3 or N4, the set rotational speed n2 is read from the storage device 19. The rotation speed controller 20 controls the drive of the spindle motor 22 according to the rotation speed read from the storage device 19 and controls the rotation speed of the spindle 11 to be the read rotation speed.

  Therefore, for example, if the weft insertion order determined by a preset weft insertion pattern is the order of weft insertion nozzles N1, N2, N3, and N4, the weft insertion nozzles for weft insertion of the weft 13 are from N1 to N2. Alternatively, when switching from N3 to N4, the rotation speed of the main shaft 11 is not changed, but when the weft insertion nozzle for weft insertion of the weft 13 is switched from N2 to N3, The rotational speed of the spindle 11 is changed from a relatively low set speed n1 corresponding to the weft insertion nozzle N2 located on the 10 side to a relatively high set speed n2 corresponding to the weft insertion nozzle N3 located on the weave 10 side. Be changed. Similarly, when the weft insertion nozzle for weft insertion 13 is switched from N4 to N1, the relatively high set rotational speed n2 corresponding to the weft insertion nozzle N4 located on the weaving front 10 side is changed to the 10 The rotational speed of the main shaft 11 is changed to a relatively low set rotational speed n1 corresponding to the weft insertion nozzle N1 located on the side.

  Accordingly, in the weft insertion nozzles N1 and N2 included in the nozzle group G1 far from the weave 10 in the warp direction, the weft movement of the reed 9 has a greater influence on the weft insertion period than the nozzle group G2. For the insertion nozzles N1 and N2, for example, the time length of the weft insertion possible period due to the saddle movement is longer than when the rotation speed of the main shaft 11 is set to be constant according to the nozzle group G2. Weft insertion can be performed stably. On the other hand, for the weft insertion nozzles N3 and N4 included in the nozzle group G2 on the side closer to the weave 10 in the warp direction, for example, compared to the case where the rotation speed of the main shaft 11 is set to be constant according to the nozzle group G1. Since weft insertion is performed at a high rotational speed, productivity can be improved. As a result, as a whole water jet loom, weft insertion by the respective weft insertion nozzles N1, N2, N3, and N4 is stably performed, and productivity can be improved.

  In the present embodiment, the nozzle group G1 and the nozzle group G2 are connected to different pumps (pumps P1, P2), and the pressure of the spray water can be set independently for each nozzle group. In comparison with the case where weft insertion is performed at the same pressure as the nozzle group G2, by increasing the pressure of the jet water of the nozzle group G1 (the weft insertion nozzles N1 and N2) whose rotational speed must be set low. The number of rotations of the main shaft 11 when the weft insertion is performed by the nozzle group G1 can be increased, and the productivity can be further improved. In addition, since the degree of increase in the pressure of the jet water can be suppressed as compared with that corresponding to the time length of the weft insertion period only by the pressure of the jet water, the usable weft 13 is limited. In addition, weft insertion can be performed stably without damaging the weft yarn 13 to be inserted, and the life of the pump can be prevented from being shortened.

  In addition, this invention is not limited to what was demonstrated in the above Example, It can implement also in the aspect changed as follows.

  First, in the said Example, although the water injection type loom 1 shall be provided with four weft insertion nozzles, the number of the weft insertion nozzles in the water injection type loom 1 which this invention presupposes is not restricted to this, A plurality of If it is a weft insertion nozzle, it may be 3 or less, or 5 or more.

  In the embodiment, the four weft insertion nozzles are grouped into the nozzle group G1 with the weft insertion nozzle N1 positioned closest to the pre-weaving front 10 side and the weft insertion nozzle N2 disposed adjacent thereto. The weft insertion nozzle N4 positioned closest to the weave 10 side and the weft insertion nozzle N3 arranged adjacent thereto are grouped as a nozzle group G2, and the same rotation speed is set for the weft insertion nozzles included in each group. It is supposed to be. That is, in the above-described embodiment, when setting the rotation speed of the main shaft 11 corresponding to each of the plurality of weft insertion nozzles provided in the water jet loom 1, the plurality of weft insertion nozzles are arranged in the order of positions with respect to the weave 10. Each group is divided into two groups so that two or more weft insertion nozzles are included, and the same rotation speed is set for the weft insertion nozzles included in each group.

  However, the rotational speed setting mode according to the present invention is not limited to this, and is the case where the number of weft insertion nozzles included in each group in which the same rotational speed is set is not the same (or substantially the same) for each group. Also good. A plurality of weft insertion nozzles may be divided into three or more groups. However, the group referred to here is not limited to the case of being composed of a plurality of weft insertion nozzles, but also includes the case of being composed of only one weft insertion nozzle. In addition, when one group is composed of a plurality of weft insertion nozzles, the positions of the weft insertion nozzles included in the same group are continuous in the warp direction (the weft insertion nozzles of the other groups are positioned in between). Not).

  For example, in the case where four weft insertion nozzles are provided as in the above embodiment, the three weft insertion nozzles from the pre-weaving 10 side or the non-weaving front 10 side are grouped together, and the remaining one weft insertion nozzle is the other. It is also possible to set the same number of rotations for each weft insertion nozzle of the group consisting of three weft insertion nozzles and set a different number of rotations for the remaining one weft insertion nozzle. Further, each weft insertion nozzle located on the most weaving front 10 side and the most anti-weaving front 10 side is made into one group, and the remaining two weft insertion nozzles are made into one group to form three groups. It is good also as what sets a rotation speed suitably according to the position with respect to each of a group. Furthermore, it is possible to set each weft insertion nozzle as a separate group and set the rotation speed for each group, that is, set a different rotation speed for each weft insertion nozzle according to its position.

  As described above, regarding the setting mode of the rotational speed of the main shaft 11 with respect to the weft insertion nozzle in the present invention, a plurality of weft insertion nozzles are grouped into a plurality of groups each including one or more weft insertion nozzles. For the included weft insertion nozzles, the number of rotations may be set appropriately according to the position of each group.

  In addition, in the said Example, the setting of the rotation speed of the main axis | shaft 11 considers the weft insertion possible period by a saddle movement, and the rotation speed higher than the group of the side far from the weaving front 10 with respect to the group near the weaving front 10 However, the rotational speed setting mode according to the present invention is not limited to this. For example, in consideration of the above-described weft insertion period based on the opening amount, the rotational speed is higher for the group far from the weaving front 10. The number of rotations may be set. This is the same for any grouping described above.

  In the embodiment, two weft insertion nozzles included in each of the two groups are connected to the same pump. In other words, each weft insertion nozzle included in a group composed of a plurality of weft insertion nozzles is connected to the same pump. The water jet loom 1 is provided with the same number of pumps as the above group, but the combination of the weft insertion nozzle and the pump in the water jet loom 1 assumed by the present invention is as described above. For example, a part of a plurality of weft insertion nozzles included in the same group (one or less than the total number) may be connected to a pump different from other weft insertion nozzles. good. Therefore, in the present invention, the number of pumps provided in the water jet loom 1 is the same as the number of weft insertion nozzles at the maximum.

  That is, as described above, weft insertion by a plurality of weft insertion nozzles included in the same group is performed at the same rotational speed, but even if included in the same group, the position in the warp direction is different, and Since weft insertion periods are different, it may be preferable to change weft insertion conditions (injection pressure, injection timing, etc.). Therefore, for some weft insertion nozzles of a plurality of weft insertion nozzles included in the same group, other weft insertion nozzles may be inserted under different weft insertion conditions depending on their positions. It may be connected to a pump different from the weft insertion nozzle.

  In addition, the combination of the weft insertion nozzle and the pump is not limited to the one in which the pumps are associated with each other, and the weft insertion nozzles included in different groups may be connected to the same pump. Therefore, in the water jet loom 1 of the present invention, all the weft insertion nozzles may be connected to one pump. Furthermore, it is good also as a structure which connects some weft insertion nozzles of the several weft insertion nozzles contained in one group to the pump to which the weft insertion nozzles (all or part) of another group are connected. .

  For example, the four weft insertion nozzles N1 to N4 are provided as in the case of the above embodiment, and the weft insertion nozzles N1 and N2 and the weft insertion nozzles N3 and N4 are grouped, and the same rotation speed is set for each group. In this case, as a result of considering the type of wefts to be inserted and / or the above-described weft insertion period and the productivity of the woven fabric, it is only necessary to set (change) the rotational speed of the spindle 11. When weaving is possible, all weft insertion nozzles may be connected to one pump, and weft insertion may be performed under the same weft insertion conditions.

  In the case of the above embodiment, the weft insertion nozzles N2 and N3 may be connected to the same pump, and the weft insertion nozzles N1 and N4 may be connected to different pumps, respectively. Three weft insertion nozzles (N1 to N3 or N2 to N4) may be connected to the same pump from the pre-weaving 10 side, and the remaining one weft insertion nozzle may be connected to another pump. Even in this case, as in the case where the weft insertion nozzles included in the same group are connected to different pumps, the weft insertion condition of the weft insertion nozzles included in the same group is determined according to the position of the weft insertion nozzle. It can be different in consideration of possible periods and the like.

  Thus, the combination of the weft insertion nozzle and the pump in the water jet loom 1 assumed by the present invention is not limited to a specific form, but the position of the weft insertion nozzle (weft insertion possible period), What is necessary is just to set suitably in consideration of the kind of weft inserted, the productivity of woven fabric, etc.

  Further, in the present invention, different rotation speeds are set between the weft insertion nozzle located closest to the weave front 10 and the weft insertion nozzle located closest to the anti-weave 10 side among the plurality of weft insertion nozzles. However, in the above-described embodiment, the input / setting display device 21 has a configuration in which the rotation number of the spindle 11 for each weft insertion nozzle can be input / set by an operator to set an arbitrary set value (rotation number). The setting of the different rotational speeds depends on the operator. However, in the case of such a configuration, there may be a case where the same rotational speed is set for the weft insertion nozzle closest to the weaving front 10 and the weft insertion nozzle closest to the anti-weaving 10 due to an operator's mistake. Therefore, in order to avoid such setting mistakes by the operator, the input / setting display device 21 may be provided with a limiting function related to the input / setting of the rotational speed.

  Specifically, in order to realize the above limiting function, the input / setting display device 21 sets the set value of the rotational speed that is input / set to the weft insertion nozzles closest to the weaving front 10 side and the most anti-weaving front 10 side. It shall have a comparator for comparison. Then, at the time when the rotation speed is input / set for each weft insertion nozzle in the input / setting display device 21 (for example, when the determination button in the above-described embodiment is selected), the comparator is 10 The setting value of the rotational speed input / set for the weft insertion nozzle on the side is compared with the setting value of the rotational speed input / set for the weft insertion nozzle on the most side 10 before weaving. If both set values are the same as a result of the comparison, the comparator outputs an abnormal signal or the like indicating a setting error, and the setting of the input / setting display device 21 is accompanied by the output of the abnormal signal from the comparator. What is necessary is just to make an error display etc. on the screen.

  Further, in the present invention, as described above, a plurality of weft insertion nozzles are grouped into a plurality of groups, and the same rotation speed is set for a plurality of weft insertion nozzles included in the same group and included in each group. However, even in this case, a plurality of weft insertion nozzles may be set due to a setting error by the operator as described above. There is a concern that a setting error may occur such that a different rotation speed is set for each weft insertion nozzle included in the group constituted by or a same rotation speed is set for the weft insertion nozzles of different groups. Therefore, the input / setting display device 21 may be provided with a restriction function for restricting such erroneous settings.

  For example, in the input / setting display device 21, a setting for assigning a group to each weft insertion nozzle can be performed, and a setting for assigning a group to each weft insertion nozzle is performed in advance. In addition, when the rotation number is input / set for each weft insertion nozzle in the input / setting display device 21, the comparator sets the rotation set for a plurality of weft insertion nozzles assigned the same group. It is also possible to compare the set values of numbers and display an error on the setting screen of the input / setting display device 21 when different set values are input / set as a result of the comparison. Alternatively, weft insertion nozzles assigned with different groups are extracted one by one for each group, the setting values of the rotation speeds set for these weft insertion nozzles are compared, and the same rotation speed is set. In such a case, an error display or the like may be displayed on the setting screen of the input / setting display device 21.

  In the above-described embodiment, the rotational speed of the main shaft 11 is set individually for the plurality of weft insertion nozzles. However, in the present invention, the rotational speed setting mode for the plurality of weft insertion nozzles is as follows. Not limited to this.

  For example, the water jet loom 1 includes three or more weft insertion nozzles, and the three or more weft insertion nozzles are grouped into a plurality of groups each including one or more weft insertion nozzles. When the number of rotations is different, the number of rotations is set in units of groups, that is, the setting of the number of rotations in the input / setting display device 21 may be input / set in correspondence with each group. good. More specifically, in the case of the above-described embodiment, the number of groups is set in the input / setting display device 21, and the four groups of nozzles N1 to N4 (groups of nozzles G1 and G2) corresponding to the four weft insertion nozzles N1 to N4 are set. ) Can be set so that groups are assigned to the weft insertion nozzles N1 to N4 in advance, and the setting screen for setting the rotation speed of the spindle 11 is made to correspond to each group. It is also possible to display (provide) an input setting field for the rotational speed.

  Further, as described above, in the case where three or more weft insertion nozzles provided in the water jet loom 1 are grouped into a plurality of groups, the water jet loom 1 is in the group as in the above embodiment. When the weft insertion nozzle and the pump are connected so that each pump corresponds to the group, the number of rotations in the input / setting display device 21 is set in units of pumps. In other words, the rotational speed may be input / set in correspondence with each pump.

  In the implementation of the present invention, when the rotational speed of the main shaft 11 is switched, the switching may take a plurality of cycles depending on the set values of the respective rotational speeds before and after the switching. In this case, when weft insertion is executed in a transient rotation state (a state in which the rotational speed of the spindle 11 is shifted from the setting value before switching to the setting value after switching), the weft insertion is performed during the weft insertion possible period. Therefore, the weft insertion may not be performed properly. Therefore, in carrying out the present invention, when the number of rotations is switched over a plurality of cycles as described above, it is preferable to perform an idle driving operation without a weft insertion in the loom cycle in the transient rotation state.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Water-jet type loom 2 Warp beam 3 Warp 4 Back roller 5 Warp opening device 6 Cage frame 7 Cage 8 Crushing device 9 Cage 10 Weaving front 11 Spindle 12 Weft insertion device 13 Weft 14 Weaving fabric 15 Loom frame 17 Weft selection device 18 Rotational speed control device 19 Storage device 20 Rotational speed controller 21 Input / setting display device 22 Spindle motor N1, N2, N3, N4 Weft insertion nozzle P1, P2 Pump H1, H2, H3, H4 Flying path V1, V2 Switching valve S Weft selection signals θ, A, B, X1, X2, C Crank angle R Curves G1, G2 indicating the swinging motion of the rod

Claims (4)

It has a plurality of weft insertion nozzles arranged in parallel in the warp direction and one or more pumps provided corresponding to the plurality of weft insertion nozzles, and the beating device and the warp opening device are driven using the main shaft as a drive source. In the water jet loom
The rotational speed of the main shaft is set so as to correspond to each of the plurality of weft insertion nozzles, and the weft insertion nozzle located closest to the weaving side and the weft located closest to the anti-weaving side among the plurality of weft insertion nozzles. Set a different number of rotations for the insertion nozzle,
A method for controlling the rotational speed of a main shaft in a water-jet loom, wherein the rotational speed of the main shaft is controlled according to the set rotational speed in accordance with the weft insertion nozzle that performs weft insertion during weaving. The water jet loom has three or more weft insertion nozzles and a plurality of the pumps, and at least one of the plurality of pumps is a plurality of the weft insertions less than the total number of the weft insertion nozzles. A nozzle that is connected to the plurality of weft insertion nozzles arranged adjacent to each other, and of the three or more weft insertion nozzles, the weft insertion nozzle located closest to the weaving front and the weft located closest to the anti-weaving front Connected to the pump different from the inlet nozzle,
The method for controlling the rotational speed of a main shaft in a water-jet loom according to claim 1, wherein the rotational speed of the main shaft is set to the same rotational speed as a weft insertion nozzle for each pump. A plurality of weft insertion nozzles arranged side by side in the warp direction, one or more pumps provided corresponding to the plurality of weft insertion nozzles, and a weft selection for each loom cycle during weaving according to preset weft selection information A water-jet loom comprising a weft selection device that outputs a signal, wherein the scissoring device and the warp opening device are driven using the main shaft as a drive source;
A storage for storing the rotational speed of the spindle in a manner corresponding to each of the plurality of weft insertion nozzles, and the rotational speed corresponding to the weft insertion nozzles according to the weft selection signal output from the weft selection device And a rotational speed controller for controlling the rotational speed of the main shaft in accordance with the read rotational speed, and a rotational speed control device for the main shaft in a water-jet loom. The water jet loom includes three or more weft insertion nozzles and a plurality of the pumps, wherein at least one of the plurality of pumps is smaller in number than the total number of the weft insertion nozzles. And connected to the plurality of weft insertion nozzles arranged adjacent to each other, and among the three or more weft insertion nozzles, the weft insertion nozzle located closest to the weaving front and the weft insertion located closest to the anti-weaving front Connected to the pump different from the nozzle,
The rotation speed control device for a main shaft in a water-jet loom according to claim 3, wherein the storage unit stores the same rotation speed for the weft insertion nozzle for each pump.

Images