False twisting machine

Abstract

To enable yarn guard work to be suitably performed on a false twisting machine having a plurality of weights.SOLUTION: A false twisting machine having a plurality of weights has a false twisting device, and a first feed roller and a second feed roller disposed so as to sandwich the false twisting device. A first motor 11a and a second motor 16a, which drive the first feed roller and the second feed roller, respectively, inverters 11b, 16b capable of adjusting rotary speeds of the first motor 11a and the second motor 16a, respectively, and an operation part 24 capable of generating signals are disposed on each weight. When receiving a signal generated by the operation part 24, a control part 40 controls the inverters 11b, 16b of the weight for which the received signal is generated, and adjusts yarn feeding speeds of the first feed roller and the second feed roller so as to be a yarn guard speed different from production speed.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a false twisting machine that applies false twisting to yarn. [Background technology]

[0002] Patent Document 1 discloses a yarn manufacturing apparatus (false twist processing machine) having multiple spindles, the yarn manufacturing apparatus including roller groups disposed upstream and downstream of a false twisting twister group (false twisting device) in the yarn supply direction. Each roller group is composed of multiple rollers attached to a line shaft and a top roller that pairs with each roller and holds the yarn. The multiple rollers correspond to each spindle, and are driven simultaneously by the rotation of the line shaft. In such a yarn manufacturing apparatus, the supplied yarn is overfed between two roller groups disposed to sandwich the false twisting twister group, or is twisted by the false twisting twister group while being stretched. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 1-132843 Summary of the Invention [Problem to be solved by the invention]

[0004] In a false twisting machine, the appropriate yarn feed speed and yarn draw ratio may differ between yarn production and yarn threading. In such a case, it is necessary to change the yarn feed speed and yarn draw ratio between yarn production and yarn threading. Here, in the above-mentioned false twisting machine, since the rollers corresponding to the respective spindles are mounted on a common line shaft, it is not possible to change the yarn feed speed and yarn draw ratio of multiple spindles individually. Therefore, it is not possible to change only the yarn feed speed and yarn draw ratio of a spindle in which a yarn breakage has occurred during yarn production to those appropriate for yarn threading. Therefore, it is not possible to perform the yarn threading operation suitably.

[0005] An object of the present invention is to enable a yarn threading operation to be performed suitably in a false twisting machine having multiple spindles. [Means for solving the problem]

[0006] A false twisting machine according to a first aspect of the present invention is a false twisting machine provided with a plurality of spindles each including a plurality of yarn feeding devices for feeding a yarn and a false twisting device for imparting a twist to the yarn, wherein when two of the plurality of yarn feeding devices adjacent to each other in the yarn running direction and arranged to sandwich the false twisting device are referred to as a first yarn feeding device and a second yarn feeding device, each spindle includes a motor provided in at least one of the first yarn feeding device and the second yarn feeding device and driving the at least one yarn feeding device, and a rotating speed adjusting device provided corresponding to each of the motors and capable of adjusting the rotation speed of the corresponding motor. the control unit receives a signal generated by the signal generating unit, and controls the rotation speed adjusting device of a target spindle from which the received signal was generated, thereby setting the yarn feeding speed of the target yarn feeding device, which is the at least one yarn feeding device of the target spindle, to a yarn threading speed, which is a speed when threading is performed and which is different from a production speed, which is a speed when producing yarn.

[0007] In the present invention, the yarn feeding speed by at least one of the first yarn feeding device and the second yarn feeding device of the spindle for which a signal is generated by the signal generating unit can be set to a threading speed different from the production speed. The yarn feeding speed between the first yarn feeding device and the second yarn feeding device depends on the yarn feeding speed of the yarn feeding device downstream in the yarn running direction among the first yarn feeding device and the second yarn feeding device. Therefore, by setting the yarn feeding speed of the downstream yarn feeding device to the threading speed, the yarn feeding speed between the first yarn feeding device and the second yarn feeding device can be made suitable for threading. In addition, by setting the yarn feeding speed by at least one of the first yarn feeding device and the second yarn feeding device to the threading speed, it is possible to make the yarn stretch ratio between the first yarn feeding device and the second yarn feeding device different from that during production. Therefore, the yarn stretch ratio can be made suitable for threading. Thus, the threading operation can be performed favorably. In addition, the present invention may be capable of changing at least one of the yarn feeding speed between the first yarn feeding device and the second yarn feeding device and the yarn draw ratio between the first yarn feeding device and the second yarn feeding device.

[0008] In the false twisting machine of the second invention, in the first invention, the motors are provided in the first yarn feeding device and the second yarn feeding device in each spindle, and the control unit controls the rotation speed adjustment devices corresponding to the motors provided in the first yarn feeding device and the second yarn feeding device in the target spindle, and sets both the yarn feeding speed by the first yarn feeding device and the yarn feeding speed by the second yarn feeding device to the yarn threading speed.

[0009] The yarn feeding speed and yarn draw ratio suitable for threading vary depending on the type of yarn and the conditions of yarn processing. In the present invention, both the yarn feeding speed and the yarn draw ratio between the first yarn feeding device and the second yarn feeding device can be made suitable for threading. Therefore, the yarn feeding speed and the yarn draw ratio can be changed in response to various yarn types and processing conditions, and the threading operation can be more suitably performed.

[0010] In the false twisting machine according to a third aspect of the present invention, in the first or second aspect of the present invention, the signal generating section is capable of detecting yarn breakage and generates a signal when yarn breakage is detected.

[0011] In the present invention, when a yarn breakage occurs on a spindle, a signal generating unit provided on the spindle generates a signal, so that the yarn sending speed of at least one of the first yarn feeding device and the second yarn feeding device of the spindle can be set to a yarn threading speed different from the production speed, thereby making it possible to perform threading work on the spindle where the yarn breakage occurred in an optimal manner.

[0012] In the false twisting machine of the fourth invention, in the second invention, the signal generating unit is configured to be operable by an operator and is an operating unit that generates a signal when operated.

[0013] In the present invention, when the operating part of a certain spindle is operated by an operator, the yarn feeding speed by at least one of the first yarn feeding device and the second yarn feeding device of that spindle can be set to a yarn threading speed different from the production speed.

[0014] In the false twisting machine of the fifth invention, in the fourth invention, two operating units are provided on each spindle, and the control unit sets the yarn feeding speed by the first yarn feeding device to the yarn threading speed when one of the two operating units is operated, and sets the yarn feeding speed by the second yarn feeding device to the yarn threading speed when the other of the two operating units is operated.

[0015] In the present invention, the yarn feeding speed and the yarn draw ratio between the first yarn feeding device and the second yarn feeding device can be changed with a high degree of freedom according to the operator's judgment.

[0016] In the false twisting machine of the sixth invention, in the fourth invention, the operation unit is provided on each spindle, and the control unit sets both the yarn feeding speed by the first yarn feeding device and the yarn feeding speed by the second yarn feeding device as the yarn threading speed when one of the operation units is operated.

[0017] In the present invention, it is only necessary to operate one operating part provided on the spindle that performs threading, and therefore operation is simple.

[0018] The false twisting machine of the seventh invention, in at least one of the first to sixth inventions, is provided with a judgment information acquisition unit capable of acquiring information for determining whether or not threading is completed for each spindle, and the control unit determines whether or not threading is completed for the target spindle based on a signal from the judgment information acquisition unit, and when it determines that threading is completed, changes the yarn feed speed by the target yarn feed device of the target spindle from the yarn threading speed to the production speed.

[0019] In the present invention, the operation for returning from the threading speed to the production speed is not required.

[0020] In the false twist processing machine of the eighth invention, in the seventh invention, the judgment information acquisition unit is capable of acquiring the magnitude of the yarn tension, and the control unit judges that yarn threading is completed when the magnitude of the yarn tension acquired by the judgment information acquisition unit is equal to or greater than a predetermined value.

[0021] In the present invention, the yarn threading speed can be changed to the production speed when the yarn tension reaches or exceeds a predetermined value.

[0022] In the false twist processing machine of the 9th invention, in the 7th invention, the judgment information acquisition unit is capable of acquiring the magnitude of the yarn tension, and the control unit judges that yarn threading is completed when a predetermined time has elapsed since the magnitude of the yarn tension acquired by the judgment information acquisition unit becomes equal to or greater than a predetermined value.

[0023] In the present invention, the yarn threading speed can be changed to the production speed when a predetermined time has elapsed since the yarn tension reached a predetermined value or more.

[0024] In the false-twisting machine according to the tenth invention, in the seventh invention, the determination information acquisition unit can detect whether there is yarn in the yarn path downstream of the first yarn feeding device and the second yarn feeding device in the yarn running direction, and the control unit determines that the yarn winding is completed when a predetermined time has elapsed since the determination information acquisition unit detected that there is yarn in the yarn path.

[0025] In the present invention, when a predetermined time has elapsed since it is detected that there is yarn in the yarn path downstream of the first yarn feeding device and the second yarn feeding device in the yarn running direction, the production speed can be set from the yarn winding speed.

[0026] In the false-twisting machine according to the eleventh invention, in the seventh invention, the determination information acquisition unit is the signal generation unit, and the control unit determines that the yarn winding is completed when a predetermined time has elapsed since a signal is generated by the signal generation unit.

[0027] In the present invention, when a predetermined time has elapsed since a signal is generated by the signal generation unit, the production speed can be set from the yarn winding speed.

[0028] The false-twisting machine according to the twelfth invention includes, in the seventh invention, a winding device provided on each spindle for winding the yarn to which twist is imparted by the false-twisting device. The winding device is configured to be operable by an operator and has a start instruction input unit capable of inputting an instruction to start winding the yarn. The determination information acquisition unit is the start instruction input unit, and the control unit determines that the yarn winding is completed when the start instruction input unit is operated.

[0029] In the present invention, when the start of winding the yarn in the winding device is instructed, the production speed can be set from the yarn winding speed.

[0030] The false twist processing machine of the thirteenth invention is the seventh invention, and further comprises a winding device provided on each spindle for winding up the yarn that has been twisted by the false twist device, the winding device having a suction section capable of sucking in the yarn and a suction detection section capable of detecting that the yarn is being sucked into the suction section, the judgment information acquisition section being the suction detection section, and the control section determining that yarn threading is complete when the suction detection section detects that the yarn is being sucked into the suction section.

[0031] In the present invention, when the yarn is sucked in the suction section of the winding device, the yarn threading speed can be changed to the production speed.

[0032] A false twisting machine according to a fourteenth aspect of the present invention is at least one of the first to thirteenth aspects of the present invention, wherein the threading speed is lower than the production speed.

[0033] In the present invention, the rotation speed of the rollers during threading is reduced compared to that during production, making threading easier.

[0034] A false twisting machine according to a fifteenth aspect of the present invention is based on at least one of the first to fourteenth aspects of the present invention, and wherein the yarn sending device is a roller.

[0035] In the present invention, the yarn feed speed by the rollers can be a yarn threading speed different from the production speed. [Brief description of the drawings]

[0036] [Figure 1] 1 is a side view of a false twisting machine according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing a false twisting machine deployed along a yarn path. [Diagram 3] 2 is a block diagram showing the electrical configuration of the main parts of the false twisting machine. FIG. [Figure 4] 10 is a flowchart illustrating an example of a processing procedure performed by a control unit. [Diagram 5] 5 is a flowchart showing a procedure for processing when a yarn breakage occurs as shown in FIG. 4. [Figure 6]FIG. 13 is a block diagram showing an electrical configuration of a main part of a false twisting machine according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] A false twisting machine 1 according to a preferred embodiment of the present invention will be described with reference to the drawings. The direction perpendicular to the plane of the paper in Fig. 1 is the machine base longitudinal direction, and the left-right direction of the paper is the machine base width direction. The direction perpendicular to both the machine base longitudinal direction and the machine base width direction is the up-down direction in which gravity acts. The machine base longitudinal direction and the machine base width direction are approximately parallel to the horizontal direction.

[0038] (Overall configuration of false twisting machine 1) The false twisting machine 1 is configured to be capable of false twisting a yarn Y made of a synthetic fiber such as nylon (a polyamide fiber) or polyester. As shown in Figs. 1 and 2, the false twisting machine 1 includes a yarn supplying section 2 for supplying the yarn Y, a processing section 3 for false twisting the yarn Y supplied from the yarn supplying section 2, and a winding section 4 for winding the yarn Y processed by the processing section 3 onto a winding bobbin Bw. As shown in Fig. 2, the components of the yarn supplying section 2, the processing section 3, and the winding section 4 are arranged in a plurality of rows in the longitudinal direction of the machine base. The longitudinal direction of the machine base is a direction perpendicular to the running plane of the yarn Y (the plane of the paper in Fig. 1) formed by the yarn path from the yarn supplying section 2 through the processing section 3 to the winding section 4.

[0039] The yarn supplying section 2 has a creel stand 5 that holds a plurality of yarn supply packages Ps. The yarn supplying section 2 supplies a plurality of yarns Y to the processing section 3. The processing section 3 false-twists the yarns Y supplied from the yarn supply packages Ps. The processing section 3 mainly includes, in order from the upstream side in the yarn running direction, a first feed roller 11, a twist stop guide 12, a first heating device 13, a cooling device 14, a false-twisting device 15, a second feed roller 16, an intertwining device 17, a third feed roller 18, a second heating device 19, and a fourth feed roller 20. The winding section 4 has a plurality of winding devices 21. Each winding device 21 winds the yarn Y false-twisted in the processing section 3 onto a winding bobbin Bw to form a winding package Pw.

[0040] The false twisting machine 1 has a main machine base 8 and a winding table 9 arranged at an interval in the width direction of the machine base. The main machine base 8 and the winding table 9 extend to approximately the same length in the longitudinal direction of the machine base. The main machine base 8 and the winding table 9 are arranged to face each other in the width direction of the machine base. The upper part of the main machine base 8 and the upper part of the winding table 9 are connected by a support frame 10. Each device constituting the processing section 3 is mainly attached to the main machine base 8 and the support frame 10. Each device constituting the winding section 4 is attached to the winding table 9. The main machine base 8, the winding table 9, and the support frame 10 form a working space A where an operator can perform work such as threading on each device. The yarn path is formed so that the yarn Y mainly runs around the working space A.

[0041] The false twisting machine 1 has a unit called a span, which includes a pair of a main machine base 8 and a winding base 9 arranged opposite each other. In one span, a plurality of processing units (also called spindles), in which a yarn path is formed so as to pass through each device constituting the processing section 3, are arranged in line in the longitudinal direction of the machine base. This allows one span to simultaneously perform false twisting on a plurality of yarns Y running in line in the longitudinal direction of the machine base. As shown in FIG. 1, in the false twisting machine 1, the spans are arranged symmetrically on the left and right of the drawing, with the center line C of the main machine base 8 in the width direction of the machine base as the axis of symmetry. The main machine base 8 is common to the left and right spans. In addition, a plurality of spans are arranged in the longitudinal direction of the machine base.

[0042] (Configuration of processing part) The configuration of the processing unit 3 will be described with reference to Figs. 1 and 2. The first feed roller 11 is configured to unwind the yarn Y from the yarn supplying package Ps attached to the yarn supplying unit 2 and send it to the first heating device 13. As shown in Fig. 2, the first feed roller 11 is configured to send one strand of yarn Y to the first heating device 13. One first feed roller 11 is provided for each spindle. The first feed roller 11 is a godet roller. The first feed roller 11 is rotated by a first motor 11a (see Fig. 3) provided for each spindle, so that the yarn Y wound around the circumferential surface of the first feed roller 11 can be sent.

[0043] In this embodiment, the twist stop guide 12 is provided for each yarn Y. The twist stop guide 12 may be provided for each two yarns Y. The twist stop guide 12 is configured to prevent the twist imparted to the yarn Y by the false twist device 15 from propagating upstream of the twist stop guide 12 in the yarn traveling direction.

[0044] The first heating device 13 is a device for heating the yarn Y fed from the first feed roller 11 to a predetermined processing temperature. The first heating device 13 is configured to be capable of heating two yarns Y, for example, as shown in FIG.

[0045] The cooling device 14 is configured to cool the yarn Y heated by the first heating device 13. The cooling device 14 is configured to cool one yarn Y, for example, as shown in Fig. 2. The cooling device 14 may be configured to be capable of cooling a plurality of yarns Y simultaneously.

[0046] The false twist device 15 is disposed downstream of the cooling device 14 in the yarn running direction. The false twist device 15 is configured to impart a twist to the yarn Y. The false twist device 15 is, for example, a so-called disk friction type false twist device, but is not limited to this. In this embodiment, the false twist device 15 is configured to impart a twist to one yarn Y. The false twist device 15 may also be configured to impart a twist to two yarns Y simultaneously.

[0047] The second feed roller 16 is configured to send the yarn Y processed by the false twist device 15 to the intertwining device 17. As shown in FIG. 2, the second feed roller 16 is configured to send one yarn Y to the intertwining device 17. One second feed roller 16 is provided for each spindle. The second feed roller 16 is a godet roller. The second feed roller 16 is rotated by a second motor 16a (see FIG. 3) provided for each spindle, so that the yarn Y wound around the circumferential surface can be sent.

[0048] In this embodiment, the yarn feeding speed of the second feed roller 16 is faster than the yarn feeding speed of the first feed roller 11. As a result, the yarn Y is stretch-twisted between the first feed roller 11 and the second feed roller 16. Note that, in each spindle, one tension sensor 22 is disposed between the false twist device 15 and the second feed roller 16. The tension sensor 22 is capable of acquiring the magnitude of the tension of the yarn Y between the first feed roller 11 and the second feed roller 16.

[0049] The interlacing device 17 is configured to interlace the yarn Y. The interlacing device 17 has, for example, a known interlace nozzle that interlaces the yarn Y by air flow.

[0050] The third feed roller 18 is configured to feed the yarn Y traveling downstream of the intertwining device 17 in the yarn traveling direction to the second heating device 19. For example, as shown in FIG. 2, the third feed roller 18 is configured to feed one yarn Y to the second heating device 19. The third feed roller 18 may be configured to feed multiple yarns Y to the downstream side in the yarn traveling direction. The yarn feeding speed of the third feed roller 18 is slower than the yarn feeding speed of the second feed roller 16. Therefore, the yarn Y is relaxed between the second feed roller 16 and the third feed roller 18.

[0051] The second heating device 19 is configured to heat the yarn Y fed from the third feed roller 18. The second heating devices 19 extend in the vertical direction, and one is provided for each span.

[0052] The fourth feed roller 20 is configured to feed the yarn Y heated by the second heating device 19 to the winding device 21. The fourth feed roller 20 is configured to be able to feed one yarn Y to the winding device 21, for example, as shown in FIG. 2. The fourth feed roller 20 may be configured to be able to feed adjacent yarns Y each downstream in the yarn running direction. The yarn feeding speed of the fourth feed roller 20 is slower than the yarn feeding speed of the third feed roller 18. Therefore, the yarn Y is relaxed between the third feed roller 18 and the fourth feed roller 20.

[0053] In each spindle, one yarn filler 23 is disposed between the fourth feed roller 20 and the winding device 21. The yarn filler 23 can detect whether or not the yarn Y is present in the yarn path between the fourth feed roller 20 and the winding device 21. In other words, the yarn filler 23 can detect yarn breakage. The yarn filler 23 generates a signal when it detects yarn breakage.

[0054] In the processing section 3 configured as above, the yarn Y drawn between the first feed roller 11 and the second feed roller 16 is twisted by the false twist device 15. The twist formed by the false twist device 15 propagates to the twist stop guide 12, but does not propagate upstream of the twist stop guide 12 in the yarn running direction. The yarn Y to which a twist has been imparted while being drawn is heated and heat-set by the first heating device 13, and then cooled by the cooling device 14. The yarn Y is untwisted downstream of the false twist device 15 in the yarn running direction, but the yarn Y maintains its wavy false twisted state due to the heat setting (i.e., the crimp of the yarn Y is maintained).

[0055] The false-twisted yarn Y is entangled by the entanglement device 17 while being relaxed between the second feed roller 16 and the third feed roller 18, and then guided downstream in the yarn running direction. Furthermore, the yarn Y is heat-treated by the second heating device 19 while being relaxed between the third feed roller 18 and the fourth feed roller 20. Finally, the yarn Y sent from the fourth feed roller 20 is wound by the winding device 21.

[0056] (Configuration of winding section) The configuration of the winding section 4 will be described with reference to FIG. 2. The winding section 4 has a winding device 21 provided on each spindle. Each winding device 21 is configured to be able to wind the yarn Y, which has been twisted by the false twist device 15, onto one winding bobbin Bw. The winding device 21 mainly includes a fulcrum guide 31, a traverse device 32, and a cradle 33. In addition, each winding device 21 is provided with a known threading device (not shown) for threading the yarn Y onto the winding bobbin Bw. The threading device is described, for example, in JP 2023-131463 A.

[0057] The fulcrum guide 31 is a guide that serves as a fulcrum when the yarn Y is traversed. The traverse device 32 is configured to be able to traverse the yarn Y using the traverse guide 34. The cradle 33 is configured to rotatably support the winding bobbin Bw. A contact roller 35 is disposed near the cradle 33. The contact roller 35 comes into contact with the surface of the winding package Pw to apply contact pressure.

[0058] Further, in each spindle, a suction section 36 capable of sucking in the yarn Y is disposed downstream of the fulcrum guide 31 in the yarn running direction. The suction section 36 is configured to be able to suck and hold the yarn Y. Furthermore, a suction sensor 36a (see FIG. 3) capable of detecting that the yarn Y is being sucked is provided for each suction section 36. A yarn hooking device (not shown) hooks the yarn Y sucked into the suction section 36 onto a winding bobbin Bw.

[0059] In the winding section 4 configured as above, the yarn Y fed from the fourth feed roller 20 is wound onto a winding bobbin Bw by each winding device 21 to form a winding package Pw.

[0060] (Electrical configuration) Next, the electrical configuration of the main parts of the false twisting machine 1 will be described with reference to FIG. 3. As shown in FIG. 3, the false twisting machine 1 has a control unit 40 that controls the operation of each device of the multiple spindles (first spindle to nth spindle). The above-mentioned first motor 11a, second motor 16a, tension sensor 22, yarn filler 23, winding device 21, and suction sensor 36a are electrically connected to the control unit 40. The first motor 11a is connected to the control unit 40 via an inverter 11b. The inverter 11b is capable of adjusting the rotation speed of the first motor 11a. The second motor 16a is connected to the control unit 40 via an inverter 16b. The inverter 16b is capable of adjusting the rotation speed of the second motor 16a. The control unit 40 is capable of controlling the inverters 11b, 16b provided on each spindle, and controls the yarn feed speed by the first feed roller 11 and the second feed roller 16 individually for each spindle.

[0061] The control unit 40 can determine whether or not a yarn breakage has occurred based on the output signal from the yarn filler 23. The method of determining whether or not a yarn breakage has occurred is not limited to this. For example, the control unit 40 may determine whether or not a yarn breakage has occurred based on the magnitude of the tension acquired by the tension sensor 22. When the control unit 40 determines that a yarn breakage has occurred, it controls the inverters 11b, 16b and the winding device 21 of the spindle in which it has been determined that a yarn breakage has occurred, and stops driving the first feed roller 11, the second feed roller 16, and the winding device 21.

[0062] The control unit 40 is further electrically connected to an operation unit 24. One operation unit 24 is provided for each spindle. The operation unit 24 is configured to be operable by an operator. When the operation unit 24 is operated, a signal is transmitted to the control unit 40. In this embodiment, the operation unit 24 is, for example, a button or a lever provided on the main machine base 8 or the like. The operation unit 24 may also be, for example, a button displayed on a display of a terminal device such as a tablet terminal capable of communicating with the control unit 40.

[0063] When the operation unit 24 is operated, the control unit 40 controls the inverters 11b, 16b of the spindle operated by the operation unit 24. Then, both the yarn feeding speed by the first feed roller 11 and the yarn feeding speed by the second feed roller 16 are set to a yarning speed, which is a speed for threading that is slower than a production speed, which is a speed for producing the yarn Y.

[0064] Specifically, for example, when the yarn Y to be produced is relatively weak, the yarn feed speed by the first feed roller 11 and the second feed roller 16 is set to the yarn threading speed so that the stretch rate of the yarn Y between the first feed roller 11 and the second feed roller 16 is lower than that during production. This makes it possible to prevent the yarn Y from breaking due to abrasion resistance or stretching during threading.

[0065] Furthermore, for example, when the yarn Y is produced at high speed, the yarn feed speed by the first feed roller 11 and the second feed roller 16 is set to the yarn threading speed so that the stretch rate of the yarn Y between the first feed roller 11 and the second feed roller 16 is increased compared to that during production. Note that when the yarn Y is produced at high speed, the production speed of the second feed roller 16 is about 1000 m / min or more.

[0066] The control unit 40 is further electrically connected to a winding start button 37. A winding start button 37 is provided for each winding device 21. That is, one winding start button 37 is provided for each spindle. The winding start button 37 is configured to be operable by an operator. The winding start button 37 is used to input an instruction to start winding the yarn Y by the winding device 21. When the winding start button 37 is operated, a signal is sent to the control unit 40.

[0067] When the winding start button 37 is operated, the control unit 40 determines that threading of the spindle for which the winding start button 37 is operated is completed. Then, the control unit 40 changes the yarn feed speed by the first feed roller 11 and the yarn feed speed by the second feed roller 16 of the spindle for which the winding start button 37 is operated from the yarn threading speed to the production speed. Furthermore, the control unit 40 controls the winding device 21 of the spindle for which the winding start button 37 is operated to start winding the yarn Y.

[0068] (Control Procedure) Next, an example of a processing procedure performed by the control unit 40 will be described with reference to the flowcharts shown in FIGS.

[0069] The process shown in Fig. 4 is repeatedly executed while the yarn Y is being produced in the false twisting machine 1. First, as shown in Fig. 4, the control unit 40 determines whether any of the spindles in the false twisting machine 1 has experienced a yarn breakage based on an output signal from the yarn filler 23 (S11). The control unit 40 repeats the determination in S11 until it determines that any of the spindles has experienced a yarn breakage. If the control unit 40 determines that any of the spindles has experienced a yarn breakage (S11: YES), it executes a yarn breakage process (see Fig. 5) for the target spindle (the spindle where the yarn breakage occurred) (S12).

[0070] As shown in Fig. 5, in the yarn breakage process, the control unit 40 first stops driving the first feed roller 11, the second feed roller 16, and the winding device 21 (S21). Next, the control unit 40 determines whether the operation unit 24 has been operated (S22). The control unit 40 repeats the determination of S22 until it determines that the operation unit 24 has been operated. When the control unit 40 determines that the operation unit 24 has been operated (S22: YES), it sets the yarn feeding speed by the first feed roller 11 and the second feed roller 16 to the yarn threading speed (S23). At this time, the first feed roller 11 and the second feed roller 16, which are in a stopped state, start to rotate, and rotate at a speed that allows the yarn Y to be fed at the yarn threading speed.

[0071] Thereafter, the control unit 40 determines whether threading is complete based on a signal transmitted when the winding start button 37 is operated (S24). The control unit 40 repeats the determination of S24 until it determines that threading is complete. When the control unit 40 determines that threading is complete (S24: YES), it changes the yarn feed speed by the first feed roller 11 and the second feed roller 16 from the threading speed to the production speed (S25). Finally, the control unit 40 starts winding the yarn Y by the winding device 21 (S26) and ends the yarn breakage process.

[0072] (Threading procedure) Here, we will explain the procedure for threading by the operator in the false twisting machine 1. When a yarn breakage occurs during yarn production and it becomes necessary to rethread the yarn Y, the operator operates the operation unit 24 (see FIG. 3) of the spindle where the yarn breakage occurred. As a result, the yarn feed speed by the first feed roller 11 and the second feed roller 16 of the spindle performing the threading becomes the yarn threading speed.

[0073] The operator first loops the yarn Y around the second feed roller 16, and then loops the yarn Y around the first feed roller 11. After that, the operator loops the yarn Y around the false twist device 15. This allows the tension sensor 22 to detect the tension of the yarn Y between the first feed roller 11 and the second feed roller 16. Furthermore, the operator loops the yarn Y around the twist stop guide 12. This causes the yarn Y to be set between the first heating device 13 and the cooling device 14.

[0074] Next, the operator threads the yarn on the third feed roller 18, sets the yarn on the second heating device 19, and threads the yarn on the fourth feed roller 20 in that order. Furthermore, the operator causes the yarn Y to be sucked into the suction unit 36 ​​provided in the winding unit 4. At this time, the yarn filler 23 detects the presence of the yarn Y in the yarn path between the fourth feed roller 20 and the winding device 21. Finally, the operator operates the winding start button 37 (see FIG. 3). As a result, the yarn Y is threaded on the winding bobbin Bw of the winding device 21 by the threading device (not shown), and then winding of the yarn Y by the winding device 21 begins.

[0075] (Features of the embodiment) As described above, the false twisting machine 1 of this embodiment is provided with a plurality of spindles each equipped with a plurality of rollers (first feed roller 11, second feed roller 16, third feed roller 18, and fourth feed roller 20) that feed the yarn Y, and a false twisting device 15 that imparts twist to the yarn Y. The first feed roller 11 and the second feed roller 16 are two rollers among the plurality of rollers that are adjacent to each other in the yarn running direction, and are arranged so as to sandwich the false twisting device 15 therebetween. The false twisting machine 1 includes a first motor 11a provided on the first feed roller 11 of each spindle and driving the first feed roller 11, a second motor 16a provided on the second feed roller 16 of each spindle and driving the second feed roller 16, an inverter 11b provided corresponding to the first motor 11a and capable of adjusting the rotation speed of the first motor 11a, an inverter 16b provided corresponding to the second motor 16a and capable of adjusting the rotation speed of the second motor 16a, an operation unit 24 provided corresponding to each spindle and capable of generating signals, and a control unit 40 capable of controlling the inverters 11b, 16b provided on each spindle and controlling the yarn feed speed by the first feed roller 11 and the second feed roller 16 individually for each spindle. When the control unit 40 receives a signal generated by the operation unit 24, it controls the inverters 11b, 16b of the target spindle, which is the spindle for which the received signal was generated, and sets the yarn feed speed by the first feed roller 11 and the yarn feed speed by the second feed roller 16 of the target spindle to a threading speed, which is a speed when threading is performed and is different from the production speed, which is the speed when producing the yarn Y.

[0076] According to the above-mentioned configuration, the yarn feed speed by the first feed roller 11 and the yarn feed speed by the second feed roller 16 of the spindle for which the signal is generated by the operation unit 24 can be set to a yarn threading speed different from the production speed. The yarn feed speed between the first feed roller 11 and the second feed roller 16 depends on the yarn feed speed of the second feed roller 16, which is located downstream of the first feed roller 11 and the second feed roller 16 in the yarn running direction. Therefore, by setting the yarn feed speed of the second feed roller 16 to the yarn threading speed, the yarn feed speed between the first feed roller 11 and the second feed roller 16 can be set to a suitable yarn threading speed. Furthermore, by setting at least one of the yarn feed speed by the first feed roller 11 and the yarn feed speed by the second feed roller 16 to the yarn threading speed, it is possible to make the draw ratio of the yarn Y between the first feed roller 11 and the second feed roller 16 different from that during production. Therefore, the draw ratio of the yarn Y can be set to a suitable draw ratio for yarn threading. Thus, the yarn threading operation can be performed favorably.

[0077] In addition, in the false twisting machine 1 of this embodiment, the control unit 40 controls the inverters 11b, 16b corresponding to the first motor 11a and the second motor 16a provided on the first feed roller 11 and the second feed roller 16, respectively, in the target spindle, to set both the yarn feed speed by the first feed roller 11 and the yarn feed speed by the second feed roller 16 to the yarn threading speed. The yarn feed speed and the draw ratio of the yarn Y suitable for threading vary depending on the type of yarn Y and the conditions of yarn processing. In this configuration, both the yarn feed speed and the draw ratio of the yarn Y between the first feed roller 11 and the second feed roller 16 can be made suitable for threading. Therefore, the yarn feed speed and the draw ratio of the yarn Y can be changed in response to various yarn types and processing conditions, and the threading operation can be more suitably performed.

[0078] In addition, in the false-twisting machine 1 of the present embodiment, the operation unit 24 is configured to be operable by an operator and generates a signal when operated. In this configuration, when the operation unit 24 of a certain spindle is operated by the operator, the yarn feeding speed by the first feed roller 11 and the second feed roller 16 of the spindle can be set to a yarn winding speed different from the production speed.

[0079] Furthermore, in the false-twisting machine 1 of the present embodiment, the operation unit 24 is provided one for each spindle. When one operation unit 24 is operated, the control unit 40 sets both the yarn feeding speed by the first feed roller 11 and the yarn feeding speed by the second feed roller 16 to the yarn winding speed. In this configuration, it is only necessary to operate one operation unit 24 provided on the spindle for yarn winding, so the operation is simple.

[0080] In addition, the false-twisting machine 1 of the present embodiment includes a winding start button 37 capable of acquiring information for determining whether or not yarn winding has been completed at each spindle. For the spindle in which the yarn feeding speed by the first feed roller 11 and the yarn feeding speed by the second feed roller 16 are set to the yarn winding speed, the control unit 40 determines whether or not yarn winding has been completed based on the signal from the winding start button 37. When it is determined that yarn winding has been completed, the control unit 40 sets the yarn feeding speed by the first feed roller 11 and the yarn feeding speed by the second feed roller 16 of the spindle from the yarn winding speed to the production speed. According to this configuration, an operation for returning from the yarn winding speed to the production speed becomes unnecessary.

[0081] Moreover, the false-twisting machine 1 of the present embodiment is provided at each spindle and includes a winding device 21 for winding the yarn Y to which twist has been imparted by the false-twisting device 15. The winding device 21 is configured to be operable by an operator and has a winding start button 37 through which an instruction to start winding the yarn Y can be input. Then, the false-twisting machine 1 determines that yarn winding has been completed when the winding start button 37 is operated. In this configuration, when an instruction to start winding the yarn Y in the winding device 21 is given, the speed can be changed from the yarn winding speed to the production speed.

[0082] Furthermore, in the false twisting machine 1 of the present embodiment, the threading speed is lower than the production speed. With this configuration, the rotation speeds of the first feed roller 11 and the second feed roller 16 are reduced during threading compared to during production, making threading easier.

[0083] Although the embodiments of the present invention have been described above based on the drawings, the specific configuration should not be considered to be limited to these embodiments. The scope of the present invention is indicated by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims.

[0084] In the above embodiment, the control unit 40 sets the yarn feed speed by the first feed roller 11 and the second feed roller 16 as the yarn threading speed when it receives a signal generated by the operation unit 24. That is, the operation unit 24 functions as the "signal generation unit" of the present invention. However, for example, the control unit 40 may set the yarn feed speed by the first feed roller 11 and the second feed roller 16 as the yarn threading speed when it receives a signal generated by the yarn filler 23 capable of detecting yarn breakage. In this case, the yarn filler 23 functions as the "signal generation unit" of the present invention.

[0085] Furthermore, in the above embodiment, the control unit 40 stops driving the first feed roller 11 and the second feed roller 16 of the spindle in which it is determined that a yarn breakage has occurred when it has been determined that a yarn breakage has occurred, but this is not limited to the above. When it is determined that a yarn breakage has occurred, the control unit 40 may maintain the production speed without stopping the driving of the first feed roller 11 and the second feed roller 16. In this case, when the operation unit 24 is operated, the control unit 40 changes the yarn feed speed by the first feed roller 11 and the yarn feed speed by the second feed roller 16 of the spindle in which the operation unit 24 is operated from the production speed to the threading speed.

[0086] In the above embodiment, the yarn threading speed is lower than the production speed, but the present invention is not limited to this. The yarn threading speed may be any speed that is different from the production speed. That is, the yarn threading speed may be higher than the production speed. The yarn threading speed may be zero. That is, the yarn threading may be performed with the first feed roller 11 and the second feed roller 16 stopped.

[0087] In the above embodiment, the first feed roller 11 and the second feed roller 16 are godet rollers that are rotated by a motor to feed the yarn Y wound around the circumference thereof, but the present invention is not limited to this. The first feed roller 11 and the second feed roller 16 may be nip rollers that are composed of a drive roller driven by a motor disposed on each spindle and a driven roller that rotates with the rotation of the drive roller.

[0088] Furthermore, in the above embodiment, the first motor 11a is provided on the first feed roller 11 in each spindle, and the second motor 16a is provided on the second feed roller 16 in each spindle, but this is not limited to the above. It is sufficient that at least one of the first motor 11a and the second motor 16a is provided on each spindle.

[0089] In addition, in the above embodiment, the case has been described where both the yarn feed speed by the first feed roller 11 and the yarn feed speed by the second feed roller 16 are set as the yarn threading speed when the operation unit 24 is operated, but this is not limited to the case. It is sufficient that at least one of the yarn feed speed by the first feed roller 11 and the yarn feed speed by the second feed roller 16 is set as the yarn threading speed when the operation unit 24 is operated.

[0090] In the above embodiment, the yarn Y is stretch-twisted between the first feed roller 11 and the second feed roller 16, but the present invention is not limited to this. That is, the yarn Y may be false-twisted while being overfed between the first feed roller 11 and the second feed roller 16. In this case, during threading, the yarn may break due to shrinkage caused by false twisting and the timing of overfeeding. Therefore, during threading, it is preferable to slightly stretch the yarn Y between the first feed roller 11 and the second feed roller 16. Therefore, for example, when the operation unit 24 is operated, only the first motor 11a is controlled to set the yarn feed speed by the first feed roller 11 to a threading speed slower than the production speed.

[0091] Furthermore, in the above embodiment, a case has been described in which the draw rate of the yarn Y between the first feed roller 11 and the second feed roller 16 is made different from that during production when the operation unit 24 is operated, but this is not limiting. The draw rate of the yarn Y between the first feed roller 11 and the second feed roller 16 may be the same as that during production when the operation unit 24 is operated.

[0092] In the above embodiment, the case where one operation unit 24 is provided for each spindle has been described, but the present invention is not limited thereto. That is, as shown in FIG. 6, two operation units 24a and 24b may be provided for each spindle. In this case, when one operation unit 24a is operated, the yarn feed speed by the first feed roller 11 may be set as the yarn threading speed, and when the other operation unit 24b is operated, the yarn feed speed by the second feed roller 16 may be set as the yarn threading speed. With this configuration, the timing at which the yarn feed speed by the first feed roller 11 is set as the yarn threading speed and the timing at which the yarn feed speed by the second feed roller 16 is set as the yarn threading speed can be shifted at the discretion of the operator. Furthermore, for example, when the operation unit 24 changes the yarn feed speed of the roller from the production speed to the yarn threading speed, the operator can freely select whether to operate both of the two operation units 24a and 24b, operate only one of them, or operate neither of them. Therefore, the yarn feed speed and the draw ratio of the yarn Y between the first feed roller 11 and the second feed roller 16 can be changed with a high degree of freedom according to the judgment of the operator.

[0093] Furthermore, in the above embodiment, the operation unit 24 is described as being for setting the yarn feed speed of the roller to the yarn threading speed, but is not limited thereto. For example, the operation unit 24 may be configured to switch the yarn feed speed of the roller of the spindle operated by the operation unit 24 between the production speed and the yarn threading speed every time it is operated. Also, for example, the operation unit 24 may be configured to switch the yarn feed speed of the roller of the spindle operated by the operation unit 24 between zero, yarn threading speed, production speed, and zero in this order every time it is operated.

[0094] Additionally, in the above embodiment, a case has been described in which it is determined whether or not threading is complete for each spindle based on a signal from the winding start button 37. In other words, the winding start button 37 is the "determination information acquisition unit" of the present invention. However, the method for determining whether or not threading is complete is not limited to this. Methods for determining whether or not threading is complete include the following. ·When a predetermined time has elapsed since the operation unit 24 was operated, it is determined that the threading is completed (the operation unit 24 is the "judgment information acquisition unit"). ·When a predetermined time has elapsed since a signal was generated by the yarn filler 23, it is determined that the threading is completed (the yarn filler 23 is the "judgment information acquisition unit"). ·When the magnitude of the tension of the yarn Y acquired by the tension sensor 22 is equal to or greater than a predetermined value, it is determined that the threading is completed (the tension sensor 22 is the "judgment information acquisition unit"). ·When a predetermined time has elapsed since the magnitude of the tension of the yarn Y acquired by the tension sensor 22 became equal to or greater than a predetermined value, it is determined that the threading is completed (the tension sensor 22 is the "judgment information acquisition unit"). ·When a predetermined time has elapsed since it was detected by the yarn filler 23 that the yarn Y is in the yarn path on the downstream side of the second feed roller 16 with respect to the yarn running direction, it is determined that the threading is completed (the yarn filler 23 is the "judgment information acquisition unit"). ·When it is detected by the suction sensor 36a that the yarn Y is being sucked into the suction unit 36, it is determined that the threading is completed (the suction sensor 36a is the "judgment information acquisition unit").

[0095] Note that it is not necessary to determine whether the threading as described above is completed. In this case, an operation unit for returning the yarn feeding speed of the roller from the threading speed to the production speed is provided for each bobbin, and the operator operates the operation unit after the threading is completed.

Explanation of Signs

[0096] 1 False Twisting Machine 11 First Feed Roller (First Yarn Feeding Device) 11a First Motor (Motor) 11b Inverter (Rotation Speed Adjusting Device) 15 False Twisting Device 16 Second Feed Roller (Second Yarn Feeding Device) 16a Second Motor (Motor) 16b Inverter (Rotation Speed Adjusting Device) 21 Winding Device 22 Tension Sensor (Judgment Information Acquisition Unit) 23 Yarn filler (signal generation unit, judgment information acquisition unit) 24, 24a, 24b Operation unit (signal generation unit, judgment information acquisition unit) 36 Intake section 36a Suction sensor (suction detection unit, judgment information acquisition unit) 37 Winding start button (start instruction input unit, judgment information acquisition unit) 40 Control section

Claims

1. A false twisting machine having a plurality of spindles each including a plurality of yarn feeding devices for feeding a yarn and a false twisting device for imparting twist to the yarn, When two yarn feeding devices adjacent to each other in a yarn running direction among the plurality of yarn feeding devices and arranged so as to sandwich the false twist device are defined as a first yarn feeding device and a second yarn feeding device, a motor provided in at least one of the first yarn feeding device and the second yarn feeding device in each spindle, the motor driving the at least one yarn feeding device; a rotation speed adjusting device provided corresponding to each of the motors and capable of adjusting the rotation speed of the corresponding motor; a signal generating unit provided corresponding to each spindle and capable of generating a signal; a control unit capable of controlling the rotation speed adjusting device provided on each spindle and controlling the yarn sending speed by the at least one yarn sending device individually for each spindle, When the control unit receives a signal generated by the signal generating unit, it controls the rotation speed adjusting device of a target spindle, which is the spindle for which the received signal was generated, thereby setting the yarn feeding speed by the target yarn feeding device, which is the at least one yarn feeding device of the target spindle, to a yarn threading speed, which is a speed when threading is performed and is different from a production speed, which is the speed when producing yarn.

2. The motor is provided in each of the first yarn feeding device and the second yarn feeding device, 2. The false twisting machine according to claim 1, wherein the control unit controls the rotation speed adjusting devices corresponding to the motors provided in the first yarn feeding device and the second yarn feeding device in the target spindle, respectively, to set both the yarn feeding speed by the first yarn feeding device and the yarn feeding speed by the second yarn feeding device to the yarn threading speed.

3. 3. The false twisting machine according to claim 1, wherein the signal generating section is capable of detecting a yarn breakage and generates a signal when the yarn breakage is detected.

4. 3. The false twisting machine according to claim 2, wherein the signal generating unit is configured to be operable by an operator and is an operating unit that generates a signal when operated.

5. The operation units are provided in pairs on each spindle, 5. The false twisting machine according to claim 4, wherein the control unit sets the yarn feeding speed by the first yarn feeding device as the yarn threading speed when one of the two operation units is operated, and sets the yarn feeding speed by the second yarn feeding device as the yarn threading speed when the other of the two operation units is operated.

6. The operation unit is provided on each spindle, The false twisting machine according to claim 4, wherein the control unit sets both the yarn feeding speed by the first yarn feeding device and the yarn feeding speed by the second yarn feeding device as the yarn threading speed when one of the operation units is operated.

7. a determination information acquisition unit capable of acquiring information for determining whether threading is completed on each spindle, 7. The false twisting machine according to claim 1, wherein the control unit determines whether or not yarn threading is completed for the target spindle based on a signal from the determination information acquisition unit, and when it determines that yarn threading is completed, changes a yarn feed speed by the target yarn feed device of the target spindle from the yarn threading speed to the production speed.

8. The determination information acquisition unit is capable of acquiring a magnitude of tension of the thread, 8. The false twisting machine according to claim 7, wherein the control unit determines that yarn threading is complete when the magnitude of the yarn tension acquired by the determination information acquisition unit is equal to or greater than a predetermined value.

9. The determination information acquisition unit is capable of acquiring a magnitude of tension of the thread, The false twisting machine according to claim 7 , wherein the control unit determines that yarn threading is complete when a predetermined time has elapsed since the magnitude of the yarn tension acquired by the judgment information acquisition unit became equal to or greater than a predetermined value.

10. the determination information acquisition unit is capable of detecting whether or not a yarn is present in a yarn path downstream of the first yarn feeding device and the second yarn feeding device in a yarn running direction, 8. The false twisting machine according to claim 7, wherein the control unit determines that yarn threading is completed when a predetermined time has elapsed since the determination information acquisition unit detected the presence of the yarn in the yarn path.

11. the determination information acquisition unit is the signal generation unit, 8. The false twisting machine according to claim 7, wherein the control unit determines that yarn threading is completed when a predetermined time has elapsed since the signal generation unit generated a signal.

12. a winding device provided on each spindle for winding the yarn twisted by the false twist device; the winding device is configured to be operable by an operator, and includes a start command input unit capable of inputting a command to start winding of a yarn, the determination information acquisition unit is the start instruction input unit, The false twisting machine according to claim 7 , wherein the control unit determines that yarn threading is completed when the start command input unit is operated.

13. a winding device provided on each spindle for winding the yarn twisted by the false twist device; The winding device includes: A suction section capable of sucking in the yarn; a suction detection unit capable of detecting that the yarn is being sucked into the suction unit, The determination information acquisition unit is the suction detection unit, 8. The false twisting machine according to claim 7, wherein the control section determines that yarn threading is completed when the suction detection section detects that the yarn is being sucked into the suction section.

14. 14. The false twisting machine according to claim 1, wherein the yarn threading speed is lower than the production speed.

15. The false twisting machine according to any one of claims 1 to 14, wherein the yarn sending device is a roller.

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