JP7626604B2 - False twisting machine - Google Patents

Description

The present invention relates to a false twisting machine in which multiple processing units each having a pin-type twisting device are arranged.

A false twisting machine has a configuration in which multiple processing units (also called spindles) equipped with twisting devices are arranged. For example, a pin-type twisting device that imparts twist to a yarn running inside a rotating pin is known as a twisting device. In the past, in false twisting machines equipped with pin-type twisting devices, the drive shafts of the pin-type twisting devices of each processing unit were hung on a common tangential belt. The pin-type twisting devices of each processing unit were configured to be driven simultaneously by rotating the tangential belt. With this configuration, if a yarn breaks in one processing unit, stopping the rotation of the tangential belt will cause the pin-type twisting devices of all processing units to stop simultaneously. For this reason, an operator had to rush to the processing unit where the yarn breakage occurred and manually disconnect the drive shafts of the pin-type twisting devices of that processing unit from the tangential belt.

In order to reduce the burden on the operator when yarn breakage occurs in the false twisting machine, for example, in Patent Document 1, the pin-type twisting device of each processing unit is configured to be driven by an individual motor. Then, control is performed so that the pin-type twisting device of the processing unit that detects yarn breakage is automatically stopped.

JP 2019-157314 A

Here, we will explain the threading operation in a false twisting processing machine in which the pin-type twisting device of each processing unit is driven individually as in Patent Document 1. When performing the threading operation, the operator threads the threads on each processing unit in order while the feed rollers of each processing unit are in operation. When the operator has finished threading the thread on the pin-type twisting device of a processing unit, he or she immediately drives that pin-type twisting device by operating a switch or the like. Otherwise, the untwisted thread will run inside the pin, which will increase the running resistance inside the pin and make it more likely for the thread to break.

When the operation of a false twisting machine is stopped for maintenance or for an extended period of closure, it is common to cut the yarn in each processing unit and perform threading when the machine is restarted. However, threading as described above takes a lot of time. For this reason, when the operation of a false twisting machine is stopped for only a short time, for example for electrical work or a lot change, it is possible to stop the yarn in each processing unit without cutting it, and omit the threading when the machine is restarted. However, if the processing units are restarted with the yarn still remaining, the feed rollers and the like are driven, but the pin-type twisting device, which has not been switched on or off by the operator, remains stopped. As a result, the yarn starts running with the pins of the pin-type twisting device not rotating, which could cause the yarn to break.

In view of the above problems, the present invention aims to reduce the time required for restarting a false twisting machine in which the pin-type twisting devices of each processing unit can be driven individually, and to prevent yarn breakage.

The present invention is characterized in that a false twisting machine is arranged with a plurality of processing units each having a pin-type twisting device that imparts twist to a yarn traveling inside a rotating pin, and the pin-type twisting device of each of the processing units can be driven individually, and is provided with a control unit that controls the operation of the plurality of processing units, and the control unit is capable of executing a simultaneous drive mode that does not cut the yarn traveling through each of the processing units when the operation of the plurality of processing units is stopped, and simultaneously drives the pin-type twisting devices of each of the processing units when the operation of the plurality of processing units is restarted.

In the present invention, when the simultaneous drive mode is executed, the operation of each processing unit is stopped without cutting the yarn, so that the threading work can be omitted when restarting the operation. Furthermore, when restarting the operation, the pin-type twisting devices of each processing unit are driven simultaneously, and the pins of the pin-type twisting devices start to rotate as the yarn starts to run, so that yarn breakage can be suppressed. Therefore, according to the present invention, it is possible to shorten the time required for restarting and suppress the occurrence of yarn breakage.

In the present invention, when restarting the simultaneous drive mode, the control unit may accelerate the rotation speed of the pins to a low rotation speed lower than the rotation speed during production.

If the pin rotation speed is suddenly increased to the production rotation speed, the thread tension may temporarily become excessive, or the thread may slacken and deviate from its original thread path, which may result in thread breakage. Therefore, as described above, when the simultaneous drive mode is executed, the pins are not suddenly accelerated to the production rotation speed, but are instead accelerated only to a low rotation speed, thereby preventing thread breakage.

In the present invention, each of the processing units may be provided with an operating unit for accelerating the rotation speed of the pin from the low rotation speed to the rotation speed during production.

By providing such an operating unit, the operator can check for abnormalities such as thread breakage or the thread deviating from its intended thread path while the pins in each processing unit are rotating at a low rotation speed, and then accelerate the pins in each processing unit in turn to the rotation speed used during production.

In the present invention, it is preferable that an operating unit is provided for simultaneously accelerating the rotation speed of the pins of each of the processing units from the low rotation speed to the rotation speed during production.

By providing such an operating unit, the operator can check for abnormalities such as thread breakage or deviation from the intended thread path while the pins in each processing unit are rotating at a low rotation speed, and then simply operate the operating unit once to simultaneously accelerate the pins of each processing unit to the production rotation speed.

In the present invention, each of the processing units has a winding device that winds the yarn that has been twisted by the pin-type twisting device onto a bobbin to form a package, and is capable of performing an exchange operation to exchange the package for a new bobbin, and the control unit may cause the winding device to execute the exchange operation after the rotation speed of the pin reaches the rotation speed during production when restarting operation in the simultaneous drive mode.

When each processing unit is stopped, the pins are decelerated from the production rotation speed while the yarn is false twisted. When each processing unit is restarted, the pins are accelerated toward the production rotation speed while the yarn is false twisted. In this way, it is preferable to eliminate yarns false twisted while the pins are rotating at a lower rotation speed than the production rotation speed, as they may be defective yarns that do not meet the specified quality. Therefore, as described above, by performing the replacement operation after the pin rotation speed reaches the production rotation speed, it is possible to prevent defective yarns from being included in the replaced package, although there is a possibility that the package before replacement may contain defective yarns.

In the present invention, the control unit may cause the winding device to perform the replacement operation a predetermined time after the rotation speed of the pin reaches the rotation speed during production.

In this way, by waiting a specified time after the pin rotation speed reaches the production rotation speed, the replacement operation is performed after the pin rotation speed has stabilized, which more reliably prevents defective yarn from being included in the replaced package.

1 is a schematic diagram showing a configuration of a false twisting machine according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the configuration of a pin-type twisting device. FIG. 3 is a view of the pin-type twisting device as seen from direction III in FIG. 2 . FIG. 2 is a block diagram showing the electrical configuration of the false twisting machine. 13 is a flowchart when a simultaneous driving mode is executed.

The following describes an embodiment of the present invention with reference to the drawings.

(Overall configuration of false twisting machine)
Fig. 1 is a schematic diagram showing the configuration of a false twisting machine 1 according to this embodiment. The false twisting machine 1 is configured such that a plurality of processing units 10 (also called spindles) for performing false twisting on a yarn Y are arranged in a direction perpendicular to the plane of the paper in Fig. 1 (hereinafter referred to as the longitudinal direction of the machine). Each processing unit 10 includes a yarn supplying section 2 for supplying the yarn Y, a processing section 3 for performing false twisting on the yarn Y supplied from the yarn supplying section 2, and a winding section 4 for winding up the yarn Y false twisted by the processing section 3 to form a package P.

The yarn supplying section 2 supplies the yarn Y from the yarn supply package Q to the processing section 3. The processing section 3 applies false twist processing to the yarn Y traveling along the yarn path. In the processing section 3, a first feed roller 11, a twist stop guide 12, a first heating device 13, a cooling device 14, a pin-type 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 are arranged along the yarn path in order from the upstream side in the yarn traveling direction. In the winding section 4, the yarn Y false twisted in the processing section 3 is wound up by a winding device 21 to form a package P.

The false twisting machine 1 has a main machine base 5 and a winding table 6 arranged opposite each other with a gap in the left-right direction of FIG. 1. The main machine base 5 and the winding table 6 are extended in the longitudinal direction of the machine base. The upper part of the main machine base 5 and the upper part of the winding table 6 are connected by a support frame 7. The devices that make up the processing section 3 of each processing unit 10 are mainly attached to the main machine base 5 and the support frame 7. The space surrounded by the main machine base 5, the winding table 6, and the support frame 7 is the working space 8. The yarn Y mainly travels around the working space 8. The operator performs various tasks such as threading in the working space 8.

(Processing department)
The first feed roller 11 is a roller that sends the yarn Y supplied from the yarn supplying section 2 toward the first heating device 13. The first feed roller 11 is disposed on the upper part of the winding table 6. The first feed roller 11 has a drive roller and a driven roller, and sends the yarn Y downstream in the yarn running direction with the yarn Y sandwiched between the drive roller and the driven roller. The drive rollers of each processing unit 10 are connected to a common drive shaft and are driven simultaneously. The second feed roller 16, the third feed roller 18, and the fourth feed roller 20 have the same configuration.

The twist stop guide 12 prevents the twist imparted to the yarn Y by the pin-type twisting device 15 from propagating upstream in the yarn running direction from the twist stop guide 12. The twist stop guide 12 is disposed between the first feed roller 11 and the first heating device 13 in the yarn running direction.

The first heating device 13 is a device for heating the yarn Y that has been twisted by the pin-type twisting device 15. The first heating device 13 is attached to the upper end of the support frame 7.

The cooling device 14 is a device for cooling the yarn Y heated by the first heating device 13. The cooling device 14 is disposed between the first heating device 13 and the pin-type twisting device 15 in the yarn running direction.

The pin-type twisting device 15 is a device for imparting twist to the yarn Y. The pin-type twisting device 15 is disposed on top of the main machine base 5. The pin-type twisting device 15 of each processing unit 10 is configured to be individually drivable by a motor 54 (see Figures 2 and 4) described below.

The second feed roller 16 is a roller that sends the yarn Y, which has been twisted by the pin-type twisting device 15, toward the intertwining device 17. The second feed roller 16 is disposed below the pin-type twisting device 15 on the main machine base 5. The speed at which the yarn Y is conveyed by the second feed roller 16 is faster than the speed at which the yarn Y is conveyed by the first feed roller 11. Therefore, the yarn Y is stretched between the first feed roller 11 and the second feed roller 16.

The intertwining device 17 is a device that intertwines the yarn Y by injecting air onto the yarn Y. The intertwining device 17 is located below the second feed roller 16 on the main machine base 5.

The third feed roller 18 is a roller that sends the yarn Y that has been entangled by the interlacing device 17 toward the second heating device 19. The third feed roller 18 is disposed below the interlacing device 17 on the main machine base 5. The speed at which the yarn Y is conveyed by the third feed roller 18 is slower than the speed at which the yarn Y is conveyed by the second feed roller 16. Therefore, the yarn Y is relaxed between the second feed roller 16 and the third feed roller 18.

The second heating device 19 is a device for heating the yarn Y fed from the third feed roller 18. The second heating device 19 is disposed below the third feed roller 18 on the main machine base 5.

The fourth feed roller 20 is a roller that sends the yarn Y that has been heat-treated by the second heating device 19 toward the winding device 21. The fourth feed roller 20 is disposed below the winding table 6. The speed at which the yarn Y is transported by the fourth feed roller 20 is slower than the speed at which the yarn Y is transported by the third feed roller 18. Therefore, the yarn Y is relaxed between the third feed roller 18 and the fourth feed roller 20.

In the processing section 3 configured in this manner, the yarn Y stretched between the first feed roller 11 and the second feed roller 16 is twisted by the pin-type twisting device 15. The twist formed by the pin-type twisting device 15 is propagated 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 stretched and twisted in this manner is heated by the first heating device 13, then cooled and heat-set by the cooling device 14. The yarn Y that has passed through the pin-type twisting device 15 is untwisted before reaching the second feed roller 16. However, since the twist of the yarn Y is heat-set as described above, each filament maintains a wavy false twist state. The yarn Y is then entangled by the intertwining device 17 and heat-set by the second heating device 19, and is wound by the winding device 21.

A cutter 23 for cutting the yarn Y is provided upstream of the first feed roller 11 in the yarn running direction. In addition, the main machine base 5 is provided with a drive switch 24 (corresponding to the operating unit of the present invention) corresponding to each processing unit 10. The drive switch 24 is a switch used to switch the operation of the motor 54 of the pin-type twisting device 15, i.e., the rotation state of the pin 41.

(Winding section)
The winding device 21 winds the yarn Y, which has been twisted by the pin-type twisting device 15, onto a bobbin B attached to a winding shaft 21a to form a package P. A bobbin storage section 28 for storing new bobbins B and a package storage section 29 for temporarily storing packages P are provided near the winding device 21. The winding device 21 is configured to be capable of performing an exchange operation of removing the package P from the winding shaft 21a and moving it to the package storage section 29, and receiving a new bobbin B from the bobbin storage section 28 and attaching it to the winding shaft 21a.

(Pin-type twisting device)
Fig. 2 is a schematic diagram showing the configuration of the pin-type twisting device 15, and Fig. 3 is a view of the pin-type twisting device 15 as viewed from the direction III in Fig. 2. The pin-type twisting device 15 imparts twist to the yarn Y running inside the cylindrical pin 41 by rotating about its axis. Note that in Fig. 2, the yarn Y runs from top to bottom. Also, in Fig. 3, the guide member 52 is not shown.

The pin-type twisting device 15 has two rotating shafts 43, 44 rotatably supported on a support member 42 via bearings (not shown). Two rollers 45, 46 are attached to the rotating shaft 43 and spaced apart in the axial direction. Two rollers 47, 48 are attached to the rotating shaft 44 and spaced apart in the axial direction. The rollers 45 and 47 are arranged at the same position in the axial direction, and as shown in FIG. 3, are slightly spaced apart so as not to contact each other. Similarly, the rollers 46 and 48 are arranged at the same position in the axial direction, and are slightly spaced apart so as not to contact each other. The rotating shaft 43 is driven to rotate around its axis by a motor 54.

The pin 41 is a cylindrical member extending in the axial direction, and the yarn Y runs inside the pin 41. A magnetic portion 41a that faces magnets 49 and 50 (described below) is formed in the axial middle of the pin 41. In addition, a winding portion 41b extending in the diametric direction is fixed inside one axial end of the pin 41 (the end downstream in the yarn running direction). The yarn Y is wound around the winding portion 41b for one revolution. With this configuration, when the pin 41 rotates around its axis, a twist is imparted to the yarn Y.

A magnet 49 is disposed between rollers 45 and 46 in the axial direction. Similarly, a magnet 50 is disposed between rollers 47 and 48 in the axial direction. The magnets 49 and 50 are fixed to the support member 42 via a bracket 51 (see FIG. 3). When the pin 41 is inserted between rollers 45 (46) and 47 (48) so that the magnetic portion 41a of the pin 41 faces the magnets 49 and 50, the pin 41 is held by the magnets 49 and 50 as shown in FIG. 3. In detail, the pin 41 is sandwiched between rollers 45 (46) and 47 (48) and is held by the magnets 49 and 50 in a state of contact with the peripheral surfaces of rollers 45 (46) and 47 (48). The pin 41 is not mechanically fixed to other members, but is held by the magnetic force of the magnets 49 and 50 and the frictional force with the peripheral surfaces of each of the rollers 45 to 48.

A ring-shaped guide member 52 is disposed upstream of the pin 41 in the yarn running direction. The guide member 52 is fixed to the support member 42 via a bracket (not shown). A pipe-shaped guide member 53 is disposed downstream of the pin 41 in the yarn running direction. The guide member 53 is directly fixed to the support member 42. However, the shapes and fixing methods of the guide members 52 and 53 are not limited to the form described here and can be modified as appropriate.

As shown by the arrow in FIG. 3, when the roller 45 is rotated by driving the rotating shaft 43, the pin 41 in contact with the peripheral surface of the roller 45 is rotated in the opposite direction to the roller 45. Furthermore, the roller 47 in contact with the peripheral surface of the pin 41 is rotated in the opposite direction to the pin 41. In this way, the pin 41 is driven to rotate around its axis, thereby imparting twist to the yarn Y.

The rotation state of the pin 41 of the pin-type twisting device 15 is switched in the following order each time the drive switch 24 provided on each processing unit 10 is pressed: stop → low speed rotation speed → production rotation speed → stop. The reason why the rotation speed is temporarily maintained at a low speed lower than the production rotation speed is to prevent the occurrence of yarn breakage caused by accelerating to the production rotation speed all at once during threading.

(Electrical configuration)
Fig. 4 is a block diagram showing the electrical configuration of the false twisting machine 1. In Fig. 4, only one processing unit 10 is shown due to space limitations, but the other processing units 10 have the same configuration. The false twisting machine 1 has a control unit 30 that controls the operation of the multiple processing units 10. A setting unit 31 is connected to the control unit 30 so that an operator can input a control mode and various setting values. Examples of the control mode include a normal mode and a simultaneous drive mode, which will be described later. Examples of the setting values that can be input by the setting unit 31 include the rotation speed (low speed rotation speed, production rotation speed) of the pin 41 of the pin-type twisting device 15. The setting unit 31 may be configured, for example, as a touch panel, or may adopt other configurations such as a combination of a keyboard and a monitor.

The machine base switch 32 is a switch used to stop or restart the operation of multiple processing units 10 all at once. When the operator operates the machine base switch 32, the control unit 30 controls the operation of each processing unit 10 according to the control mode and various setting values set by the setting unit 31. The control unit 30 is also connected to the drive switch 24 provided on each processing unit 10. The control unit 30 can estimate the rotation state of the pin 41 of the pin-type twisting device 15 by recognizing the state of the drive switch 24 of each processing unit 10. In addition, the rotation state of the pin 41 is configured to be switchable not only by the drive switch 24 but also by the control unit 30.

(Problems when stopping operation without cutting the thread)
When the operation of the false twisting machine 1 is stopped for maintenance, a long period of closure, or the like, the operator selects the normal mode and then presses the machine base switch 32. In the normal mode, the control unit 30 stops the operation of each processing unit 10 after causing the cutter 23 of each processing unit 10 to cut the yarn Y, or at the same time as cutting the yarn Y. When the operation of each processing unit 10 is stopped after cutting the yarn Y in this way, the operator needs to perform threading work when the processing unit is restarted.

When threading, the operator presses the machine base switch 32 to drive the feed rollers 11, 16, 18, 20 and the winding device 21 of each processing unit 10. When restarting in normal mode, the pin-type twisting device 15 will not be driven even if the machine base switch 32 is pressed. When the operator finishes threading the pin-type twisting device 15 of a certain processing unit 10, he immediately presses the drive switch 24 of that processing unit 10 to rotate the pin 41 of the pin-type twisting device 15. If the pin 41 of the pin-type twisting device 15 is not rotated immediately after threading, the running resistance of the yarn Y when passing through the winding section 41b will increase, making the yarn more likely to break.

Because threading takes a lot of time, when the operation of the false twisting machine 1 is stopped for a short time, for example for electrical work or a lot change, it is possible to leave the yarn Y as it is without cutting it. However, when the machine base switch 32 is pressed to restart the machine with the yarn Y still remaining, in normal mode, the feed rollers 11, 16, 18, 20 and the winding device 21 of each processing unit 10 are driven, but the pin-type twisting device 15 of each processing unit 10 remains stopped. As a result, the yarn Y runs with the pin 41 not rotating, which may cause the yarn to break. Therefore, the false twisting machine 1 is equipped with a simultaneous drive mode that allows the yarn to be restarted while suppressing the occurrence of yarn breakage, even if the operation of each processing unit 10 is stopped without cutting the yarn Y.

(Simultaneous drive mode)
A series of operations from stopping operation of the false twisting machine 1 to restarting operation when the simultaneous drive mode is selected will be described with reference to the flow chart in Fig. 5. When the machine base switch 32 is pressed with the simultaneous drive mode selected during operation of the false twisting machine 1 (YES in step S1), the control unit 30 stops operation of each processing unit 10 without cutting the yarn Y with the cutter 23 (step S2). This allows the yarn Y to remain in each processing unit 10, eliminating the need for threading work when restarting the machine.

When electrical work, lot change, or other work is completed with the false twisting machine 1 stopped and the false twisting machine 1 is to be restarted, the operator presses the machine base switch 32. When the machine base switch 32 is pressed (YES in step S3), the control unit 30 restarts each processing unit 10 (step S4). In the simultaneous drive mode, when the machine base switch 32 is pressed, the feed rollers 11, 16, 18, 20 and winding device 21 of each processing unit 10 are driven, and the pin-type twisting device 15 of each processing unit 10 is also driven simultaneously. This can prevent yarn breakage caused by the yarn Y starting to run even when the pin 41 is not rotating. However, the rotation speed of the pin 41 is limited to a low rotation speed. This is to prevent yarn breakage from occurring by accelerating the rotation speed of the pin 41 to the production rotation speed all at once.

While maintaining the rotational speed of the pin 41 at a low rotational speed, the operator checks in turn for any problems in each processing unit 10, such as thread breakage or the thread deviating from its original thread path. For any processing unit 10 that has been confirmed to have no problems, the operator presses the drive switch 24 of that processing unit 10 once (YES in step S5) to accelerate the pin 41 to the rotational speed during production (step S6). Note that the processes in steps S5 to S8 are executed in turn for each processing unit 10.

Although not shown in the flowchart of Figure 5, for the processing unit 10 where the yarn breakage occurred, the operator presses the drive switch 24 of that processing unit 10 twice to temporarily stop the pin-type twisting device 15. Then, after completing the yarn threading work, the operator presses the drive switch 24 once to check again whether there are any problems with the low rotation speed, and if there are no problems, presses the drive switch 24 once more to accelerate the pin 41 to the rotation speed during production (step S6). Then, proceed to step S7.

When a predetermined time has elapsed since the rotation speed of the pin 41 reaches the rotation speed during production (YES in step S7), the control unit 30 causes the winding device 21 of that processing unit 10 to execute a replacement operation (step S8). The above-mentioned predetermined time is the time required for the pin 41 to start accelerating from a low rotation speed and to stabilize at the rotation speed during production. The predetermined time can be freely set via the setting unit 31. The reason for executing the replacement operation a predetermined time after the pin 41 starts accelerating to the rotation speed during production is as follows.

When each processing unit 10 is stopped, the yarn Y is wound by the winding device 21 even after each device, such as the feed rollers 11, 16, 18, 20 and the pin-type twisting device 15, starts to decelerate and stops. However, the yarn Y that is false-twisted when each device is not operating under production conditions may be of low quality. Therefore, the package P in which low-quality yarn Y is wound is managed as a defective package or discarded. Similarly, when each processing unit 10 is restarted, the yarn Y that is processed before each device, such as the feed rollers 11, 16, 18, 20 and the pin-type twisting device 15, reaches the production operating conditions may also be of low quality.

Therefore, by performing the replacement operation after a predetermined time has elapsed since the pins 41 of the pin-type twisting device 15 reached the production rotation speed, i.e., after they have stabilized at the production rotation speed, all of the yarn Y that may be of low quality and was produced when the operation was stopped and restarted is wound onto the package P before replacement. This makes it possible to prevent low-quality yarn Y from being included in the package P formed after replacement, minimizing the production of defective packages.

Once steps S5 to S8 have been performed for each processing unit 10, restart of the false twisting machine 1 in simultaneous drive mode is completed.

(effect)
In the false twisting machine 1 of this embodiment, when the simultaneous drive mode is executed, the operation of each processing unit 10 is stopped without cutting the yarn Y, so that the threading work can be omitted when restarting the machine. Furthermore, when restarting the machine, the pin-type twisting devices 15 of each processing unit 10 are driven simultaneously, and the pins 41 of the pin-type twisting devices 15 start to rotate as the yarn Y starts to run, so that yarn breakage can be suppressed. Therefore, the time required for restarting the machine can be shortened and the occurrence of yarn breakage can be suppressed.

In this embodiment, when restarting in the simultaneous drive mode, the control unit 30 accelerates the rotation speed of the pin 41 to a low rotation speed that is lower than the rotation speed during production. If the rotation speed of the pin 41 is suddenly increased to the rotation speed during production, the tension of the thread Y may temporarily become excessive, or the thread Y may slacken and deviate from its original thread path, which may result in thread breakage. Therefore, as described above, when executing the simultaneous drive mode, the pin 41 is not suddenly accelerated to the rotation speed during production, but is instead accelerated only to the low rotation speed, thereby preventing thread breakage.

In this embodiment, each processing unit 10 is provided with an operation unit (drive switch 24) for accelerating the rotation speed of the pin 41 from a low rotation speed to the rotation speed during production. By providing such an operation unit, the operator can accelerate the pin 41 of each processing unit 10 in turn to the rotation speed during production after checking for any abnormalities such as thread breakage or deviation of the thread Y from its original thread path while the pin 41 in each processing unit 10 is rotating at a low rotation speed.

In this embodiment, when the control unit 30 restarts the operation in the simultaneous drive mode, the control unit 30 causes the winding device 21 to perform the replacement operation after the rotation speed of the pin 41 reaches the rotation speed during production. When the operation of each processing unit 10 is stopped, the pin 41 performs the false twist processing on the yarn Y while decelerating from the rotation speed during production. Also, when the operation of each processing unit 10 is restarted, the pin 41 performs the false twist processing on the yarn Y while accelerating toward the rotation speed during production. In this way, it is preferable to eliminate as much as possible the yarn Y false twisted while the pin 41 is rotating at a rotation speed lower than the rotation speed during production, since it may be a defective yarn that does not meet the specified quality. Therefore, as described above, by performing the replacement operation after the rotation speed of the pin 41 reaches the rotation speed during production, it is possible to avoid the defective yarn being included in the package P after replacement, although the package P before replacement may contain a defective yarn.

In this embodiment, the control unit 30 causes the winding device 21 to perform the replacement operation a predetermined time after the rotational speed of the pin 41 reaches the production rotational speed. In this way, by waiting a predetermined time after the rotational speed of the pin 41 reaches the production rotational speed, the replacement operation is performed after the rotational speed of the pin 41 has stabilized, so that it is possible to more reliably prevent defective yarn from being included in the replaced package P.

Other Embodiments
A description will now be given of modifications to the above embodiment, in which various changes have been made.

In the above embodiment, the rotational speed of the pin 41 of the pin-type twisting device 15 is temporarily maintained at a low rotational speed when the false twisting machine 1 is restarted. However, the rotational speed of the pin 41 may be quickly accelerated to the production rotational speed when the false twisting machine 1 is restarted.

In the above embodiment, each processing unit 10 is provided with an operating unit (drive switch 24) for accelerating the rotation speed of the pin 41 from a low rotation speed to the production rotation speed. However, instead of such an operating unit, an operating unit for accelerating the rotation speed of the pin 41 of each processing unit 10 from a low rotation speed to the production rotation speed may be provided. In this case, the operator can accelerate the pin 41 of each processing unit 10 to the production rotation speed simultaneously by simply operating the operating unit once after checking for any abnormalities such as thread breakage or deviation of the thread Y from its original thread path while the pin 41 is rotating at the low rotation speed in each processing unit 10.

In the above embodiment, when restarting in simultaneous drive mode, the winding device 21 of that processing unit 10 is automatically made to perform the replacement operation a predetermined time after the rotation speed of the pin 41 reaches the rotation speed during production. However, once the rotation of the pin 41 has stabilized at the rotation speed during production, the operator may operate a predetermined switch or the like to cause the winding device 21 to perform the replacement operation. Also, it is not essential to cause the winding device 21 to perform the replacement operation when restarting.

The machine base switch 32 and drive switch 24 in the above embodiment may be of a button type, lever type, dial type, or any other suitable configuration.

1: False twisting machine 10: Processing unit 15: Pin-type twisting device 30: Control unit
24 : Drive switch (operation part)
41: Pin Y: Thread B: Bobbin P: Package

Claims (8)

A false twisting machine in which a plurality of processing units each having a pin-type twisting device for twisting a yarn traveling inside a rotating pin are arranged, and the pin-type twisting device of each processing unit is configured to be individually drivable,
A control unit for controlling the operation of the plurality of processing units is provided,
The control unit is capable of executing a simultaneous drive mode in which the control unit does not cut the yarn running through each of the processing units when the operation of the multiple processing units is stopped, and the pin-type twisting devices of each of the processing units are driven simultaneously when the operation of the multiple processing units is restarted. The false twisting machine according to claim 1, characterized in that, when restarting in the simultaneous drive mode, the control unit accelerates the rotational speed of the pins to a low rotational speed lower than the rotational speed during production. The false twisting machine according to claim 2, characterized in that each processing unit is provided with an operating unit for accelerating the rotational speed of the pin from the low rotational speed to the rotational speed during production. The false twisting machine according to claim 2, characterized in that an operating unit is provided for simultaneously accelerating the rotational speed of the pins of each processing unit from the low rotational speed to the production rotational speed. Each of the processing units has a winding device that winds the yarn twisted by the pin-type twisting device onto a bobbin to form a package, and is capable of performing an exchange operation to exchange the package for a new bobbin,
5. The false twisting machine according to claim 1, wherein the control unit causes the winding device to perform the replacement operation after the rotational speed of the pins reaches the rotational speed during production when the false twisting machine is restarted in the simultaneous drive mode. The false twisting machine according to claim 5, characterized in that the control unit causes the winding device to perform the replacement operation a predetermined time after the rotational speed of the pin reaches the rotational speed during production. 7. The false twisting machine according to claim 1, wherein the control unit is capable of executing a normal mode in which, when the operation of the plurality of processing units is stopped, the cutter of each of the processing units cuts the yarn. 8. The false twisting machine according to claim 7, wherein when the machine is restarted in the normal mode, the pin-type twisting devices of the processing units are not driven.

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