Weft insertion method for water jet loom and device thereof

Abstract

To provide a weft insertion device for a water jet loom, in which an eccentric wheel mechanism is used as a motion conversion mechanism, thereby capable of performing a weft insertion by a suction operation from a discharge completion position of a plunger to a suction completion position and a discharge operation from the suction completion position to the discharge completion position, and accommodating various specifications such as the kind of a weft yarn, the injection pressure of the pressure water, the injection water amount and the structure of the loom.SOLUTION: A weft insertion device for a water jet loom comprises: a plunger pump PP having a plunger PL, a suction valve SV, and a discharge valve DV; and a weft insertion nozzle N connected to the discharge valve of the plunger pump and inserting the weft Y into the opening of the warp by the jet of pressure water PW from the discharge valve. The weft insertion device comprises a servo motor SM driven in synchronization with the weft inserting time of a loom and a pump control unit for controlling the rotative direction, rotational angle and rotational speed of a main shaft SMS of the servo motor, and controls the rotative direction, rotational angle and rotational speed of the servo motor by the pump control unit to perform the weft insertion by the sucking and discharging operations of the plunger.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method and an apparatus for inserting a weft into a water jet loom, for example, when inserting a single or multiple weft threads by jetting pressurized water. [Background technology]

[0002] A conventional weft insertion method and device for this type of water jet loom includes a plunger pump having a plunger, a suction valve and a discharge valve, and a weft insertion nozzle connected to the discharge valve of the plunger pump for inserting a weft into a warp opening by spraying pressurized water from the discharge valve, the plunger being connected to a cam mechanism consisting of a cam that rotates synchronously with the main shaft of the loom and a rocking lever, and the cam mechanism and a spring mechanism built into the plunger work together to perform the suction and discharge operations of the plunger. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2002-235261 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of the conventional structure, it is necessary to prepare several types of the cam mechanism and spring mechanism according to the type of weft yarn, single or multiple weft yarns, plunger speed which is a factor determining the jet pressure, plunger stroke which is a factor determining the amount of jet water, loom structure, etc., which results in a complicated weft insertion structure and reduced versatility for various weft yarns and looms. [Means for solving the problem]

[0005] The present invention has an object to solve such inconveniences, and the invention of a method as described in claim 1 of the present invention relates to a water jet loom including a plunger pump having a plunger, a suction valve and a discharge valve, and a weft insertion nozzle connected to the discharge valve of the plunger pump and inserting a weft into a warp opening by jetting pressurized water from the discharge valve. The water jet loom comprises a servomotor driven in synchronization with the weft insertion timing of the loom, a motion conversion mechanism for converting the rotation of a main shaft of the servomotor into reciprocating motion of the plunger, and a pump control unit for controlling the rotation direction, rotation angle and rotation speed of the main shaft of the servomotor, and the motion conversion mechanism includes a drive shaft rotated in a forward or reverse direction by the main shaft of the servomotor, and an eccentric wheel provided on the drive shaft and having a central axis eccentric to the rotation axis of the drive shaft by an eccentric amount. and an eccentric wheel mechanism is used which comprises a guide frame formed with a guide long hole into which the eccentric wheel can be fitted and which is guided by a linear guide bearing in the reciprocating direction of the plunger, the limit of the reciprocating motion of the plunger is defined as an origin position where the rotation angle of the drive shaft is 0°, the origin position is defined as a discharge completion position, the return limit of the reciprocating motion of the plunger is determined by the rotation angle of the drive shaft in the forward or reverse direction, the rotation angle being within a range of less than 180° in each of the forward and reverse directions with the origin position as the boundary, the return limit being defined as a suction completion position, and the distance between the end of the reciprocating plunger and the return limit is defined as a stroke, and the weft is inserted by a suction operation of the plunger from the discharge completion position to the suction completion position and a discharge operation of the plunger from the suction completion position to the discharge completion position.

[0006] The invention of the device described in claim 2 is a water jet loom equipped with a plunger pump having a plunger, a suction valve, and a discharge valve, and a weft insertion nozzle connected to the discharge valve of the plunger pump and inserting a weft into a warp opening by jetting pressurized water from the discharge valve, the water jet loom comprising a servomotor driven in synchronization with a weft insertion timing of the loom, a motion conversion mechanism for converting the rotation of a main shaft of the servomotor into a reciprocating motion of the plunger, and a pump control unit for controlling the rotation direction, rotation angle, and rotation speed of the main shaft of the servomotor, the motion conversion mechanism including a drive shaft rotated in a forward or reverse direction by the main shaft of the servomotor, an eccentric wheel provided on the drive shaft and having a central axis eccentric to the rotation axis of the drive shaft by an eccentric amount, and a guide into which the eccentric wheel can be fitted. a return limit of the reciprocating motion of the plunger is determined by the rotation angle of the drive shaft in the forward or reverse direction, the rotation angle being within a range of less than 180° in each of the forward and reverse directions with the origin position as the boundary, the return limit being the suction completion position, and the distance between the travel limit and the return limit of the reciprocating plunger is defined as a stroke, and the weft is inserted by a suction operation of the plunger from the discharge completion position to the suction completion position and a discharge operation of the plunger from the suction completion position to the discharge completion position.

[0007] The invention of the device described in claim 3 is characterized in that a plurality of the weft-insertion nozzles are provided, a flow path switching unit is provided for selectively supplying pressurized water from the discharge valve to the plurality of weft-insertion nozzles, and the weft insertion of a plurality of wefts is performed by jetting pressurized water from the plurality of weft-insertion nozzles.

[0008] In the device according to claim 4, the pump control section includes: loom information acquiring means for acquiring loom information consisting of a yarn type signal of the weft yarn, an operation signal from the loom, a rotation angle detection signal of a main shaft of the loom, a weft insertion time signal, and a rotation speed signal of the main shaft of the loom; plunger position detecting means for detecting a plunger end position and a plunger return limit position; plunger control information output means for calculating an injection pressure and an injection amount of pressurized water injected from the weft insertion nozzle, a stroke of the plunger, a reciprocating speed of the plunger, a discharge start time, a discharge completion time, a suction start time, and a suction completion time based on the loom information from the loom information acquiring means, and outputting plunger control information; motor control means for calculating a rotation direction, a rotation angle and a rotation speed of the main shaft of the servo motor based on the plunger control information from the plunger control information output means, and outputting motor control information; and motor driving means for driving the servo motor based on the motor control information from the motor control means.

[0009] In addition, in the device invention described in claim 5, the discharge operation of the plunger from the suction completion position to the discharge completion position by rotating the drive shaft in the forward or reverse direction, and the suction operation from the discharge completion position to the suction completion position, are performed by the drive shaft not stopping at the origin position, but by the drive shaft passing the origin position and continuing to rotate in the forward or reverse direction.

[0010] The invention of the device recited in claim 6 is characterized in that a reduction mechanism is interposed between the main shaft of the servo motor and the drive shaft. Effect of the Invention

[0011] As described above, the present invention according to claims 1 and 2 comprises a servo motor driven in synchronization with the weft-insertion timing of the loom, a motion conversion mechanism for converting the rotation of the main shaft of the servo motor into the reciprocating motion of the plunger, and a pump control unit for controlling the rotation direction, rotation angle and rotation speed of the main shaft of the servo motor. The motion conversion mechanism includes an eccentric wheel mechanism including a drive shaft rotated in a forward or reverse direction by the main shaft of the servo motor, an eccentric wheel provided on the drive shaft and having a central axis eccentric to the rotation axis of the drive shaft by an eccentric amount, and a guide frame having a guide slot into which the eccentric wheel can be fitted and guided by a linear guide bearing in the reciprocating motion direction of the plunger. The limit of the reciprocating motion of the plunger is set as an origin position where the rotation angle of the drive shaft is 0°, and the origin position is set as an origin position. The plunger is driven at the discharge completion position, and the return limit of the reciprocating motion of the plunger is determined by the rotation angle of the drive shaft in the forward or reverse direction, the rotation angle being within a range of less than 180° in either the forward or reverse direction with the origin position as the boundary. The return limit is the suction completion position, and the distance between the end of the reciprocating plunger and the return limit is the stroke. The weft thread can be inserted by the suction operation of the plunger from the discharge completion position to the suction completion position and the discharge operation from the suction completion position to the discharge completion position, and this can accommodate various specifications such as the type of weft thread, the plunger speed which is a factor determining the injection pressure of the pressurized water, the plunger stroke which is a factor determining the amount of injected water, and the structure of the loom. This can simplify the weft thread insertion structure and improve the versatility for various weft threads and looms.

[0012] In the invention described in claim 3, a plurality of the weft insertion nozzles are provided, and a flow path switching unit is provided for selectively supplying pressurized water from the discharge valve to the plurality of weft insertion nozzles, so that a plurality of weft threads are inserted by jetting pressurized water from the plurality of weft insertion nozzles. Therefore, for a plurality of weft threads, the plunger can perform a suction operation from the discharge completion position to the suction completion position and a discharge operation from the suction completion position to the discharge completion position, and various specifications such as the types of the plurality of weft threads, the plunger speed which is a factor determining the jet pressure of the pressurized water for the plurality of weft threads, the plunger stroke which is a factor determining the amount of jetted water, the structure of the loom, etc. can be accommodated, and the weft insertion structure for a plurality of weft threads can be simplified and the versatility for various plurality of weft threads and looms can be improved.

[0013] In the invention of claim 4, the pump control section includes loom information acquisition means for acquiring loom information including a yarn type signal of the weft yarn, an operation signal from the loom, a rotation angle detection signal of a main shaft of the loom, a weft insertion timing signal, and a rotation speed signal of the main shaft of the loom, plunger position detection means for detecting a plunger stroke limit position and a plunger return limit position, plunger control information output means for calculating an injection pressure and an injection amount of pressurized water injected from the weft insertion nozzle, a plunger stroke, a plunger reciprocating speed, a discharge start time, a discharge completion time, a suction start time, and a suction completion time based on the loom information from the loom information acquisition means, and outputting plunger control information, and The pump control unit is configured to include a motor control means for calculating a rotation direction, a rotation angle and a rotation speed of the main shaft of the servo motor and outputting motor control information, and a motor drive means for driving the servo motor based on the motor control information from the motor control means. Therefore, the rotation direction, rotation angle and rotation speed of the main shaft of the servo motor can be controlled by cooperation of the loom information acquisition means, plunger position detection means, plunger control information output means, motor control means and motor drive means of the pump control unit, and the servo motor can be driven in synchronization with the loom. As a result, the injection pressure, amount of pressurized water injected from the weft insertion nozzle, injection timing, etc. can be controlled. This simplifies the weft insertion structure and improves the versatility for various wefts and looms.

[0014] In the invention described in claim 5, the discharge operation of the plunger from the suction completion position to the discharge completion position by rotating the drive shaft in the forward or reverse direction, and the suction operation from the discharge completion position to the suction completion position, are performed by the drive shaft not stopping at the origin position, but by the drive shaft passing the origin position and continuing to rotate in the forward or reverse direction. Therefore, the discharge operation and the suction operation of the weft yarn to be used in the next weft insertion are performed by continuously rotating in the same direction as the forward or reverse rotation of the drive shaft, which makes it possible to prevent the plunger from going too far, or so-called overshoot, and to prevent an increase in power consumption due to an increase in the torque of the servo motor, thereby making it possible to smoothly insert the weft yarn.

[0015] In addition, in the invention described in claim 6, a reduction mechanism is interposed between the main shaft and the drive shaft of the servo motor, so that a servo motor with a small rated torque equivalent to the reduction ratio of the reduction mechanism can be used, thereby making it possible to miniaturize the servo motor. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is an explanatory side view of a first embodiment of the present invention. [Diagram 2] FIG. 1 is an explanatory plan view of a first embodiment of the present invention. [Diagram 3] FIG. 1 is an explanatory cross-sectional view of a first embodiment of the present invention. [Figure 4] FIG. 1 is an explanatory side cross-sectional view of a first embodiment of the present invention. [Diagram 5] FIG. 1 is an explanatory cross-sectional view of a first embodiment of the present invention. [Figure 6] FIG. 2 is a control system block diagram of the first embodiment of the present invention. [Figure 7] FIG. 2 is a timing chart according to the first embodiment of the present invention. [Figure 8] FIG. 2 is an explanatory diagram of the operation of the first embodiment of the present invention. [Figure 9] FIG. 4 is a water pressure circuit diagram of a second embodiment of the present invention. [Figure 10] FIG. 11 is a timing chart according to a second embodiment of the present invention. [Figure 11] FIG. 11 is a timing chart according to a second embodiment of the present invention. [Figure 12] FIG. 11 is an explanatory diagram of the operation of the second embodiment of the present invention. [Figure 13] FIG. 11 is an explanatory diagram of the operation of the second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] 1 to 13 show embodiments of the present invention, with FIGS. 1 to 8 showing a first embodiment corresponding to the invention described in claims 1 and 2, and FIGS. 9 to 13 showing a second embodiment corresponding to the invention described in claim 3.

[0018] In the first embodiment shown in Figs. 1 to 8, as shown in Figs. 1, 2, 3, 6 and 8, the water jet loom is roughly divided into a plunger PL, a plunger pump PP having a check valve structure, a suction valve SV and a discharge valve DV having a check valve structure, and a weft insertion nozzle N connected to the discharge valve DV of the plunger pump PP and for inserting a weft Y into a warp opening (not shown) by injecting pressurized water PW from the discharge valve DV. In the water jet loom, a servo motor SM driven in synchronization with the weft insertion timing of the loom, and a main shaft SM of the servo motor SM are provided. S The motion conversion mechanism MC converts the rotation of the plunger PL into reciprocating motion, and the main shaft SM of the servo motor SM S and a pump control unit PC for controlling the rotation direction, rotation angle and rotation speed of the main shaft SM of the servo motor SM as the motion conversion mechanism MC. S A drive shaft DS rotates in a forward direction CW (clockwise in the drawing) or a reverse direction CCW (counterclockwise in the drawing) by a O The axis that is eccentric by the amount of eccentricity ε is the central axis EW O The eccentric wheel EW is a roller bearing EW. The eccentric wheel EW is fitted into a guide slot GG. J An eccentric wheel mechanism EM is used, which is made up of a guide frame GF guided by a linear guide bearing GJ in the reciprocating direction of the plunger PL. In this case, the guide long hole GG is formed in an elongated hole shape extending in a direction perpendicular to the reciprocating direction of the plunger PL, and the eccentric wheel EW is supported by a rolling bearing EW. JThe plunger PL rolls in the guide long hole GG by the rotation of the drive shaft DS and the engagement of the eccentric wheel EW with the guide long hole GG, and the guide frame GF is reciprocated by the rotation of the drive shaft DS and the engagement of the eccentric wheel EW with the guide long hole GG. The end limit LL of the reciprocating motion of the plunger PL is set to the origin position OP where the rotation angle θ of the drive shaft DS is 0°, and the origin position OP is set to the discharge completion position VP. The return limit RL of the reciprocating motion of the plunger PL is determined by the rotation angle θ of the drive shaft DS in the forward direction CW or the reverse direction CCW, and the rotation angle θ is within a range of less than 180° in the forward direction CW or the reverse direction CCW, respectively, with the origin position OP as the boundary. The return limit RL is set to the suction completion position SP. The distance between the end limit LL and the return limit RL of the reciprocating plunger PL is set to the stroke ST. The water W in the water tank WT is sucked into the suction pipe SV by the suction action SA of the plunger PL from the discharge completion position VP to the suction completion position SP. P The water W in the plunger pump PP is sucked into the plunger pump PP from the suction valve SV through the discharge pipe DV. The water W in the plunger pump PP is compressed into pressurized water PW by the discharge action VA from the suction completion position SP to the discharge completion position VP. This pressurized water PW is then discharged from the discharge valve DV to the discharge pipe DV. P The weft yarn Y is fed to the weft insertion nozzle N via the suction action SA and the discharge action VA to insert the weft yarn Y.

[0019] In this case, as shown in FIG. 1, the guide frame GF of the eccentric wheel mechanism EM and the plunger PL are connected by a connecting rod CR, and in this case, as shown in FIG. O The eccentricity ε from the origin is set to ε=8 mm, and the rotation angle θ of the drive shaft DS is set to θ=90°. When the drive shaft DS is rotated by a rotation angle θ=180° in the forward direction CW or in the reverse direction CCW about the origin position OP, as shown in FIG. 5, the full stroke ST of the plunger PL is set to 2×ε=16 mm. The reason why the rotation angle θ of the drive shaft DS is set to a range of less than 180° in the forward direction CW or in the reverse direction CCW about the origin position OP, is that when the drive shaft DS is rotated by more than the rotation angle θ=180° in the forward direction CW or in the reverse direction CCW about the origin position OP, the plunger PL will move backward from the forward limit LL to the return limit RL, and then move forward again from the return limit RL to the forward limit LL.

[0020] 2 and 6, the pump control unit PC includes a loom information acquiring means LIM for acquiring loom information LI including a yarn type signal of the weft yarn Y, an operation signal from the loom, a rotation angle detection signal of the main shaft of the loom, a weft-insertion timing signal, and a rotation speed signal of the main shaft of the loom, a plunger position detecting means PPM for detecting a position of the stroke limit LL of the plunger PL and a position of the return limit RL of the plunger PL, a plunger control information output means PIM for calculating an injection pressure P and an injection water amount Q of the pressurized water PW injected from the weft-insertion nozzle N, a stroke ST of the plunger PL, a reciprocating motion speed of the plunger PL, a discharge start time, a discharge completion time, a suction start time, and a suction completion time based on the loom information LI from the loom information acquiring means LIM, and a plunger control information output means PIM for outputting plunger control information PI, and a main shaft SM of the servo motor SM for outputting plunger control information PI based on the plunger control information PI from the plunger control information output means PIM. S The servo motor SM is configured to include a motor control means MIM that calculates the rotation direction, rotation angle, and rotation speed of the servo motor SM and outputs motor control information MI, and a motor drive means SMM that drives the servo motor SM based on the motor control information MI from the motor control means MIM.

[0021] The loom information LI is obtained by acquiring information from the loom or setting information manually input to a setting means (not shown). The loom information acquiring means LIM detects the position of the plunger PL by using an encoder. The plunger control information PI is calculated by using, for example, the injection pressure P and the plunger speed PL stored in a storage means (not shown). V The plunger control information PI from the plunger control information output means PIM is used to calculate the correlation between the stroke ST of the plunger PL and the amount of water injected Q, and the main shaft SM of the servo motor SM is calculated based on the correlation between the stroke ST of the plunger PL and the amount of water injected Q. S The rotation direction, rotation angle and rotation speed of the servo motor SM are calculated, and the servo motor SM is driven by the motor drive means SMM based on motor control information MI from the motor control means MIM.

[0022] In this case, as shown in Figures 7 and 8, the discharge operation VA of the plunger PL from the suction completion position SP to the discharge completion position VP by rotating the drive shaft DS in the forward direction CW or reverse direction CCW, and the suction operation SA of the weft yarn Y used for the next weft insertion from the discharge completion position VP to the suction completion position SP are performed by the drive shaft DS passing the origin position OP and continuing to rotate in the forward direction CW or reverse direction CCW without stopping at the origin position OP.

[0023] In this case, as shown in FIG. 1 and FIG. 3, the main shaft SM of the servo motor SM S and the drive shaft DS, a reduction mechanism RM is interposed between them.

[0024] In this case, the reduction mechanism RM is, as shown in FIG. 1, FIG. 3, and FIG. 4, a main shaft SM of the servo motor SM. S A gear mechanism GM having a pair of gears GD·GE is used between the drive shaft DS and the servo motor SM. The reduction ratio is i=3. The gear mechanism GM having a pair of gears GD·GE reduces the speed of the main shaft SM of the servo motor SM. S The rotation direction of the drive shaft DS is opposite to that of the drive shaft DS.

[0025] Since this first embodiment has the above-mentioned configuration, as shown in Figs. 7 and 8, it is applied to the weft insertion of a single weft Y. The stroke ST is set to 8 mm based on the conditions such as the type of the single weft Y. The rotation angle θ of the drive shaft DS to set the stroke ST = 8 mm is 90° from the origin position OP. Therefore, the suction operation SA is performed to the suction completion position SP by rotating the drive shaft DS in the reverse CCW direction (progressive operations P1 → P2·P5). After a waiting time, the discharge operation is performed from the suction completion position SP to the origin position OP by rotating the drive shaft DS in the forward CW direction. The discharge operation VA is performed up to the completion position VP (step P2 → P3 → P1), the weft Y is inserted by the injection of pressurized water PW from the weft insertion nozzle N, and then the drive shaft DS does not stop at the origin position OP, but passes the origin position OP and continues to rotate in the forward direction CW, and a suction operation SA is performed from the discharge completion position VP to the suction completion position SP (step P1 → P3), and then, after a waiting time, the drive shaft DS rotates in the reverse direction CCW to return from the suction completion position SP to the origin position. A discharge operation VA is performed until the discharge completion position VP of the weft insertion nozzle OP (progressive motion P4→P1), and the weft Y is inserted by the injection of pressurized water PW from the weft insertion nozzle N. After that, the drive shaft DS does not stop at the origin position OP, but passes the origin position OP and continues to rotate in the reverse direction CCW, and a suction operation SA is performed from the discharge completion position VP to the suction completion position SP (progressive motion P1→P5). After that, after a waiting time, the drive shaft DS rotates again in the forward direction CW to the suction completion position SP. A discharge operation VA is performed from SP to the discharge completion position VP at the origin position OP (progressive motion P2→P3→P1), and the weft yarn Y is inserted by spraying pressurized water PW from the weft insertion nozzle N. Thereafter, the drive shaft DS does not stop at the origin position OP, but passes beyond the origin position OP and continues to rotate in the forward direction CW, performing a suction operation SA from the discharge completion position VP to the suction completion position SP (progressive motion P1→P3), and thereafter the discharge operation VA and suction operation SA are repeated.

[0026] As shown in Figs. 1, 2, 3, 6 and 8, the servo motor SM driven in synchronization with the weft-insertion timing of the loom and the main shaft SM of the servo motor SM SThe motion conversion mechanism MC converts the rotation of the plunger PL into reciprocating motion, and the main shaft SM of the servo motor SM S and a pump control unit PC for controlling the rotation direction, rotation angle and rotation speed of the main shaft SM of the servo motor SM as the motion conversion mechanism MC. S A drive shaft DS rotates in a forward direction CW or a reverse direction CCW by a O The axis that is eccentric by the amount of eccentricity ε is the central axis EW O An eccentric mechanism EM is used, which is composed of an eccentric EW having an eccentric ring EW and a guide frame GF having an elongated guide hole GG into which the eccentric EW can be fitted, and whose movement is guided by a linear guide bearing GJ in the reciprocating direction of the plunger PL. The end limit LL of the reciprocating movement of the plunger PL is set to an origin position OP where the rotation angle θ of the drive shaft DS is 0°, and the origin position OP is set to a discharge completion position VP. The return limit RL of the reciprocating movement of the plunger PL is determined by the rotation angle θ of the drive shaft DS in the forward direction CW or the reverse direction CCW, and the rotation angle θ is set to the origin position O. The plunger PL has a return limit RL of less than 180° in either the forward direction CW or the reverse direction CCW with respect to the boundary at P, and the return limit RL is set to the suction completion position SP. The distance between the stroke limit LL and the return limit RL of the reciprocating plunger PL is set to the stroke ST. The weft Y can be inserted by the suction operation SA of the plunger PL from the discharge completion position VP to the suction completion position SP and the discharge operation VA of the plunger PL from the suction completion position SP to the discharge completion position VP. The plunger speed PL V It is possible to accommodate various specifications such as the stroke ST of the plunger PL, which is a factor that determines the amount of sprayed water Q, and the structure of the loom, thereby simplifying the weft insertion structure of the weft yarn Y and improving versatility for various weft yarns Y and looms.

[0027] 2 and 6, the pump control unit PC includes a loom information acquiring means LIM for acquiring loom information LI including a yarn type signal of the weft yarn Y, an operation signal from the loom, a rotation angle detection signal of the main shaft of the loom, a weft-insertion timing signal, and a rotation speed signal of the main shaft of the loom, a plunger position detecting means PPM for detecting a position of the stroke limit LL of the plunger PL and a position of the return limit RL of the plunger PL, a plunger control information output means PIM for calculating an injection pressure P and an injection water amount Q of the pressurized water PW injected from the weft-insertion nozzle N, a stroke ST of the plunger PL, a reciprocating motion speed of the plunger PL, a discharge start time, a discharge completion time, a suction start time, and a suction completion time based on the loom information LI from the loom information acquiring means LIM, and a plunger control information output means PIM for outputting plunger control information PI, and a main shaft SM of the servo motor SM for outputting plunger control information PI based on the plunger control information PI from the plunger control information output means PIM. S and a motor drive means SMM for driving the servo motor SM based on the motor control information MI from the motor control means MIM. Therefore, the pump control unit PC includes a loom information acquisition means LIM, a plunger position detection means PPM, a plunger control information output means PIM, the motor control means MIM and the motor drive means SMM, which cooperate with each other to control the rotation direction, rotation angle and rotation speed of the main shaft SM of the servo motor SM. S The rotation direction, rotation angle and rotation speed of the servo motor SM can be controlled, and the servo motor SM can be driven in synchronization with the loom, so that the injection pressure P, injection water amount Q and injection timing of the pressurized water PW from the weft insertion nozzle N can be controlled. This simplifies the weft insertion structure of the weft yarn Y and improves the versatility for various weft yarns Y and looms.

[0028] In this case, as shown in Figs. 7 and 8, the discharge operation VA of the plunger PL from the suction completion position SP to the discharge completion position VP by rotating the drive shaft DS in the forward direction CW or the reverse direction CCW, and the suction operation SA of the weft Y to be used for the next weft insertion from the discharge completion position VP to the suction completion position SP are performed by the drive shaft DS not stopping at the origin position OP, but by the drive shaft DS passing the origin position OP and continuing to rotate in the forward direction CW or the reverse direction CCW. Therefore, the discharge operation VA and the suction operation SA of the weft Y to be used for the next weft insertion are performed by continuously rotating in the same direction as the rotation of the drive shaft DS in the forward direction CW or the reverse direction CCW. This makes it possible to prevent the plunger PL from going too far, i.e., overshooting, and to prevent an increase in power consumption due to an increase in the torque of the servo motor SM, thereby making it possible to smoothly insert the weft Y.

[0029] In this case, as shown in FIG. 1 and FIG. 3, the main shaft SM of the servo motor SM S Since the reduction mechanism RM is interposed between the drive shaft DS and the drive shaft DS, a servo motor SM with a small rated torque corresponding to the reduction ratio i of the reduction mechanism RM can be used, making it possible to reduce the size of the servo motor SM.

[0030] 9 to 13 shows a different structure, and will be described by using the same reference numerals to denote the same components as in the first embodiment. In this case, a plurality of the weft-insertion nozzles N are provided, and a flow path switching unit FS is provided for selectively supplying the pressurized water PW from the discharge valve DV to the plurality of weft-insertion nozzles N··, so that the weft-insertion of a plurality of weft yarns Y·· is achieved by spraying the pressurized water PW from the plurality of weft-insertion nozzles N··. This second embodiment is also configured with the pump control unit PC and the reduction gear mechanism RM of the first embodiment.

[0031] In this case, three types of weft yarn Y A , Y B and Y C Three types of weft insertion nozzles are applied to the weft insertion of A , N B and N CThree types of weft yarn Y are used. A , Y B and Y C From the yarn type and other conditions, weft yarn Y A The stroke ST is set to 7 mm, and the weft Y B The stroke ST is set to 8 mm, and the weft Y C The stroke ST of the weft yarn Y is set to 9 mm. A The rotation angle θ of the drive shaft DS to make the stroke ST = 7 mm is 82.82° (θ = Cos -1 1 / 8=Cos -1 0.125=82.82°), and the weft Y B In order to set the stroke ST = 8 mm, the rotation angle θ of the drive shaft DS is 90° from the origin position OP, and the weft yarn Y C In order to make the stroke ST = 9 mm, the rotation angle θ of the drive shaft DS is 97.18° (θ = 90° + Sin -1 1 / 8=90°+Sin -1 0.125=90°+7.18=97.18°).

[0032] [Table 1]

[0033] In this case, as the flow path switching unit FS, as shown in FIG. 1 ·FV 2 A discharge valve DV of the plunger pump PP is connected to the inlet side of the flow path switching unit FS, and a weft nozzle N is connected to the outlet side of the flow path switching unit FS. A , N B and N C are connected, and two switching valves FV 1 ·FV 2 The flow path switching unit FS switches the pressure water PW from the plunger pump PP to three types of weft nozzles N. A , N B and N C The system is structured so that the electricity generated is distributed and supplied to the following areas:

[0034] In this second embodiment, the operation is performed successively from FIG. 10 (FIG. 12) to FIG. 11 (FIG. 13). First, referring to FIG. 10 and FIG. 12, the weft yarn Y A In the weft insertion, the suction operation SA is performed to the suction completion position SP by rotating the drive shaft DS in the reverse CCW direction (progressive motion P11 → P12), and after a waiting time, the discharge operation VA is performed from the suction completion position SP to the discharge completion position VP at the origin position OP by rotating the drive shaft DS in the forward CW direction (progressive motion P13 → P11), and the weft insertion nozzle N A The weft yarn Y is sprayed with pressurized water PW from A After that, the drive shaft DS does not stop at the origin position OP, but passes the origin position OP and continues to rotate in the forward direction CW, and the weft Y to be used for the next weft insertion is inserted from the discharge completion position VP. B The suction operation SA is performed to reach the suction completion position SP (steps P11 to P13), and the weft yarn Y B In the weft insertion, after the waiting time, the discharge operation VA is performed from the suction completion position SP to the discharge completion position VP at the origin position OP by rotating the drive shaft DS in the reverse CCW direction (progression P14 → P11), and the weft insertion nozzle N B The weft yarn Y is sprayed with pressurized water PW from B After that, the drive shaft DS does not stop at the origin position OP, but passes the origin position OP and continues to rotate in the reverse direction CCW, and the weft Y to be used for the next weft insertion is inserted from the discharge completion position VP. C The suction operation SA is performed to reach the suction completion position SP (steps P11 to P15), and the weft yarn Y C In the weft insertion, after the standby time, referring to FIG. 10 and FIG. 13, the drive shaft DS rotates in the forward direction CW to perform the discharge operation VA from the suction completion position SP to the discharge completion position VP at the origin position OP (the progress operation P16→P11), and the weft insertion nozzle N C The weft yarn Y is sprayed with pressurized water PW from C After that, the drive shaft DS does not stop at the origin position OP, but passes the origin position OP and continues to rotate in the forward direction CW, and the weft Y to be used for the next weft insertion is inserted from the discharge completion position VP. AThen, the suction operation SA is performed to reach the suction completion position SP (progressive operation P11→P16).

[0035] Next, referring to FIG. 11 and FIG. 13, again, the weft yarn Y A In the weft insertion, the suction operation SA is performed from the origin position OP to the suction completion position SP by rotating the drive shaft DS in the forward direction CW (progressive motion P11 → P16), and after a waiting time, the discharge operation VA is performed from the suction completion position SP to the discharge completion position VP of the origin position OP by rotating the drive shaft DS in the reverse direction CCW (progressive motion P17 → P11), and the weft insertion nozzle N A The weft yarn Y is sprayed with pressurized water PW from A After that, the drive shaft DS does not stop at the origin position OP, but passes the origin position OP and continues to rotate in the reverse direction CCW, and the weft Y to be used for the next weft insertion is inserted from the discharge completion position VP. B The suction operation SA is performed to reach the suction completion position SP (steps P11 to P18), and the weft yarn Y B In the weft insertion, after the waiting time, the discharge operation VA is performed from the suction completion position SP to the discharge completion position VP at the origin position OP by rotating the drive shaft DS in the forward direction CW (progression P19 → P11), and the weft insertion nozzle N B The weft yarn Y is sprayed with pressurized water PW from B After that, the drive shaft DS does not stop at the origin position OP, but passes the origin position OP and continues to rotate in the forward direction CW, and the weft Y to be used for the next weft insertion is inserted from the discharge completion position VP. C The suction operation SA is performed to reach the suction completion position SP (steps P11 to P19), and the weft yarn Y C In the weft insertion, after the waiting time, the discharge operation VA is performed from the suction completion position SP to the discharge completion position VP at the origin position OP by rotating the drive shaft DS in the reverse CCW direction (progression P20 → P11), and the weft insertion nozzle N C The weft yarn Y is sprayed with pressurized water PW from C Then, the weft Y is inserted again. AIn the weft insertion, the drive shaft DS does not stop at the origin position OP, but passes the origin position OP and continues to rotate in the reverse direction CCW, and the weft Y to be used for the next weft insertion is inserted from the discharge completion position VP. A The suction operation SA is performed to reach the suction completion position SP (step P11→P12), and thereafter, the weft yarn Y A , Y B and Y C The discharge operation VA and the suction operation SA of the weft insertion are repeated.

[0036] Therefore, even in the second embodiment, the weft yarns Y... can be inserted by the suction operation SA of the plunger PL from the discharge completion position VP to the suction completion position SP and the discharge operation VA of the plunger PL from the suction completion position SP to the discharge completion position VP. The plunger speed PL V This embodiment can accommodate various specifications such as the stroke ST of the plunger PL, which is a factor in determining the amount of sprayed water Q, and the structure of the loom, and can obtain the same effects as the first embodiment described above. As a result, the weft insertion structure for multiple weft yarns Y··· can be simplified, and versatility for various multiple weft yarns Y··· and looms can be improved.

[0037] The present invention is not limited to the above embodiment, and the suction valve SV, the discharge valve DV, the plunger pump PP, the weft nozzle N, the weft nozzle N A , weft nozzle N B , weft nozzle N C The number, form, structure, etc. of the motion conversion mechanism MC, pump control unit PC, eccentric wheel mechanism EM, loom information acquisition means LIM, plunger position detection means PPM, plunger control information output means PIM, motor control means MIM, motor drive means SMM, and reduction mechanism RM can be designed by suitably changing them.

[0038] As described above, the intended purpose can be fully achieved. [Explanation of symbols]

[0039] Y weft Y A Weft Y B Weft Y C Weft Q Injection water amount P injection pressure PL Plunger PP Plunger Pump PW Pressurized water PC pump control unit PPM plunger position detection means PI Plunger Control Information PIM Plunger control information output means PL V Plunger Speed N Weft nozzle N A Weft Insertion Nozzle N B Weft Insertion Nozzle N C Weft Insertion Nozzle SV Suction Valve SM servo motor S.M. S main shaft SP Suction completion position SA Suction operation ST Stroke SMM motor drive means CW forward direction CCW reverse direction DV Discharge valve DS Drive Shaft DS O Rotation axis ε Eccentricity EW Eccentric wheel E.W. O center axis EM eccentric wheel mechanism GF Guide Frame GJ Linear guide bearing GG Guide slot θ Rotation angle OP origin position LI loom information LIM loom information acquisition means LL line limit RL return limit RM reduction mechanism VP discharge completion position VA discharge operation MC Motion Conversion Mechanism MI Motor Control Information MIM Motor Control Means FS flow path switching section

Claims

1. A water jet loom including a plunger pump having a plunger, a suction valve, and a discharge valve, and a weft insertion nozzle connected to the discharge valve of the plunger pump and inserting a weft into a warp opening by jetting pressurized water from the discharge valve, comprises a servomotor driven in synchronization with a weft insertion timing of the loom, a motion conversion mechanism for converting the rotation of a main shaft of the servomotor into a reciprocating motion of the plunger, and a pump control unit for controlling the rotation direction, rotation angle, and rotation speed of the main shaft of the servomotor, wherein the motion conversion mechanism includes a drive shaft rotated in a forward or reverse direction by the main shaft of the servomotor, an eccentric wheel provided on the drive shaft and having a central axis eccentric to the rotation axis of the drive shaft by an eccentric amount, and a guide elongated hole into which the eccentric wheel can be fitted. a return limit of the reciprocating motion of the plunger is determined by the rotation angle of the drive shaft in a forward or reverse direction, the rotation angle being within a range of less than 180° in each of the forward and reverse directions with the origin position as a boundary, the return limit being a suction completion position, and a distance between the travel limit and the return limit of the reciprocating plunger is defined as a stroke, and the weft is inserted by a suction operation of the plunger from the discharge completion position to the suction completion position and a discharge operation of the plunger from the suction completion position to the discharge completion position.

2. A water jet loom including a plunger pump having a plunger, a suction valve, and a discharge valve, and a weft insertion nozzle connected to the discharge valve of the plunger pump and inserting a weft into a warp opening by jetting pressurized water from the discharge valve, comprises a servomotor driven in synchronization with a weft insertion timing of the loom, a motion conversion mechanism for converting the rotation of a main shaft of the servomotor into a reciprocating motion of the plunger, and a pump control unit for controlling the rotation direction, rotation angle, and rotation speed of the main shaft of the servomotor, wherein the motion conversion mechanism includes a drive shaft rotated in a forward or reverse direction by the main shaft of the servomotor, an eccentric wheel provided on the drive shaft and having a central axis eccentric to the rotation axis of the drive shaft by an eccentric amount, and a guide elongated hole into which the eccentric wheel can be fitted. a return limit of the reciprocating motion of the plunger is determined by the rotation angle of the drive shaft in a forward or reverse direction, the rotation angle being within a range of less than 180° in each of the forward and reverse directions with the origin position as a boundary, the return limit being a suction completion position, and a distance between the travel limit and the return limit of the reciprocating plunger is defined as a stroke, and the weft insertion device for a water jet loom is characterized in that an eccentric wheel mechanism consisting of a guide frame whose movement is guided by a linear guide bearing in the reciprocating direction of the plunger, the end of the reciprocating motion of the plunger is defined as an origin position where the rotation angle of the drive shaft is 0°, the origin position being a discharge completion position,

3. 3. The weft insertion device for a water jet loom according to claim 2, wherein a plurality of the weft insertion nozzles are arranged, a flow path switching unit is provided for selectively supplying pressurized water from the discharge valve to the plurality of weft insertion nozzles, and a plurality of wefts are inserted by jetting pressurized water from the plurality of weft insertion nozzles.

4. 4. The weft insertion device for a water jet loom according to claim 2 or 3, wherein the pump control section comprises: loom information acquiring means for acquiring loom information consisting of a yarn type signal of the weft yarn, an operation signal from the loom, a rotation angle detection signal of a main shaft of the loom, a weft insertion time signal, and a rotation speed signal of the main shaft of the loom; plunger position detecting means for detecting a plunger stroke limit position and a plunger return limit position; plunger control information output means for calculating an injection pressure and an injection water amount of pressurized water injected from the weft insertion nozzle, a stroke of the plunger, a reciprocating motion speed of the plunger, a discharge start time, a discharge completion time, a suction start time, and a suction completion time based on the loom information from the loom information acquiring means, and outputting plunger control information; motor control means for calculating a rotation direction, a rotation angle and a rotation speed of the main shaft of the servo motor based on the plunger control information from the plunger control information output means, and outputting motor control information; and motor driving means for driving the servo motor based on the motor control information from the motor control means.

5. 4. The weft insertion device of a water jet loom according to claim 2 or 3, characterized in that the discharge operation of the plunger from the suction completion position to the discharge completion position by rotating the drive shaft in the forward or reverse direction and the suction operation from the discharge completion position to the suction completion position are performed by the drive shaft passing the origin position and continuing to rotate in the forward or reverse direction without stopping at the origin position.

6. 4. The weft insertion device for a water jet loom according to claim 2, further comprising a speed reducing mechanism disposed between a main shaft of said servo motor and said drive shaft.

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