JP2020204126A - Pot spinning machine - Google Patents

Abstract

To provide a pot spinning machine capable of reducing the possibility of the failure by a suction pipe to suck a raw yarn.SOLUTION: A pot spinning machine comprises a traverse device 30 for traversing a roughened yarn 20 parallel to a rotational axis of a back roller pair 15, a middle roller pair 16 and a front roller pair 17 of a draft device 10 for stretching the roughened yarn 20, and a control unit 34 for controlling the traverse device 30 so that a position of a fiber bundle is aligned with a position of a suction pipe 14 at the start of spinning at the latest.SELECTED DRAWING: Figure 2

Description

The present invention relates to a pot spinning frame, and more particularly to a pot spinning frame having a traverse device.

As one of the spinning machines, a pot spinning machine using a cylindrical pot is known. The pot spinning machine described in Patent Document 1 has a draft mechanism having a plurality of roller pairs and stretching a blister yarn into a yarn, and a sucking pipe for sucking the yarn stretched by the draft mechanism.

Japanese Unexamined Patent Publication No. 10-168673

Spinning frames generally have a traverse mechanism that reciprocates the crude yarn in a direction parallel to the axial direction of the rollers of the draft mechanism so that the crude yarn does not continue to abut on one point of the roller.
However, when the pot spinning machine described in Patent Document 1 is provided with a traverse mechanism, the distance between the suction pipe and the blister yarn may increase depending on the traverse position when spinning is stopped. Therefore, there is a problem that the suction of the blister yarn by the suction pipe may fail when the spinning is restarted.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a pot spinning frame capable of reducing the possibility that suction of a fiber bundle by a suction tube fails.

The pot spinning frame according to the present invention has a traverse device that traverses the fiber bundle in parallel with the rotation axis of the roller pair of the draft device that stretches the fiber bundle, and a suction tube that positions the fiber bundle at the latest at the start of spinning. It is provided with a control unit that controls the traverse device so as to match the position.

Further, the control unit may control the traverse device so that the position of the fiber bundle is aligned with the position of the suction tube at the time when the spinning is stopped.
Further, the control unit may stop traversing the fiber bundle when adjusting the position of the fiber bundle to the position of the suction tube.
Further, the control unit may accelerate or decelerate the traverse speed of the fiber bundle when adjusting the position of the fiber bundle to the position of the suction tube.

According to the present invention, a traverse device that reciprocates the fiber bundle in parallel with the rotation axis of the roller pair of the draft device that stretches the fiber bundle to traverse the fiber bundle, and a position of the fiber bundle at the latest at the start of spinning. Since it has a control unit that controls the traverse device so as to match the position of the suction pipe, it is possible to reduce the possibility that the suction of the coarse yarn by the suction pipe fails.

It is the schematic which shows the draft apparatus of the pot spinning frame which concerns on Embodiment 1 of this invention. It is the schematic which shows the traverse apparatus of the pot spinning frame which concerns on Embodiment 1 of this invention. It is the schematic which shows the traverse apparatus of the pot spinning frame which concerns on Embodiment 1 of this invention. It is the schematic which shows the traverse operation example of the conventional pot spinning frame. It is the schematic which shows the traverse operation of the pot spinning frame which concerns on Embodiment 1 of this invention. It is the schematic which shows the traverse operation of the pot spinning frame which concerns on Embodiment 2 of this invention. It is the schematic which shows the traverse operation of the pot spinning frame which concerns on Embodiment 2 of this invention. It is the schematic which shows the traverse apparatus of the pot spinning frame which concerns on Embodiment 3 of this invention. It is the schematic which shows the traverse apparatus of the pot spinning frame which concerns on Embodiment 4 of this invention.

Embodiment 1.
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.
First, the pot spinning frame according to the first embodiment of the present invention will be described.
FIG. 1 is a schematic view showing a configuration of a draft device of a pot spinning frame according to a first embodiment of the present invention. The pot spinning frame is equipped with a draft device 10 for each spindle.

(Draft device)
The draft device 10 is a device that stretches the coarse yarn 20 to a predetermined fineness. The draft device 10 includes a plurality of paired top back rollers 15a and bottom back rollers 15b, paired top middle rollers 16a and bottom middle rollers 16b, and paired top front rollers 17a and bottom front rollers 17b. It is configured using a pair of rollers. The top back roller 15a and the bottom back roller 15b form a back roller pair 15, the top middle roller 16a and the bottom middle roller 16b form a middle roller pair 16, and the top front roller 17a and the bottom front roller 17b form a front roller pair 17. There is. Further, the blister yarn 20 constitutes a fiber bundle.

The plurality of roller pairs are arranged in the order of back roller pair 15, middle roller pair 16, and front roller pair 17 from the upstream side to the downstream side in the transport direction of the crude yarn 20. Further, among the roller pairs, those provided on the upper side of the crude yarn 20 are the top back roller 15a, the top middle roller 16a, and the top front roller 17a. The bottom back roller 15b, the bottom middle roller 16b, and the bottom front roller 17b are provided on the lower side of the crude yarn 20. Each roller pair is attached to a roller arm 11.

The top back roller 15a, the top middle roller 16a, and the top front roller 17a are formed by coating a roller made of metal with rubber. The bottom back roller 15b, the bottom middle roller 16b, and the bottom front roller 17b are made of metal.

Comparing the number of revolutions per unit time (rpm) of each roller pair, the number of revolutions of the middle roller vs. 16 is higher than the number of revolutions of the back roller vs. 15 and the number of revolutions of the front roller vs. 17 is the number of revolutions of the middle roller vs. 16. Higher than the number. In this way, the rotation speeds of the rollers are different from each other, and the draft device 10 stretches the yarn material thinly by utilizing the difference in rotation speeds, that is, the difference in rotation speeds. In the following description, the number of rotations of the roller pair is also referred to as the rotation speed. The number of rotations of a pair of rollers and the rotation speed are in a proportional relationship with each other.

(trumpet)
A trumpet 37 is provided upstream of the draft device 10. The trumpet 37 has a tubular shape through which the blister thread 20 can pass. The trumpet 37 is attached to a traverse device described later, and traverses the crude yarn 20.

(Thread tube)
A suction pipe 14 is provided downstream of the draft device 10. The suction pipe 14 sucks the coarse yarn 20 stretched to a predetermined fineness by the draft device 10 by air suction. This suction operation is called sucking shino. The wicked yarn 20 is guided into the pot by a thread guide tube (not shown) arranged coaxially with the pot. Thread sensors 19a and 19b are provided between the top front roller 17a and the bottom front roller 17b and the suction pipe 14.

(Traverse device)
FIG. 2 shows the arrangement of each roller and the traverse device 30 when the draft device 10 is viewed from the side of the roller arm 11 shown in FIG. A pair of top back roller 15a and bottom back roller 15b, top middle roller 16a and bottom middle roller 16b, top front roller 17a and bottom front roller 17b are provided on the left and right sides of the roller arm 11.

The traverse device 30 has a traverse bar 38 and a trumpet 37. The traverse bar 38 is arranged parallel to each rotation axis of the top back roller 15a and the bottom back roller 15b, and is configured to be reciprocating and moving in each rotation axis direction. That is, the traverse bar 38 is configured to be able to reciprocate and move in the direction intersecting the coarse yarn 20.

One trumpet 37 is provided on each side of the trumpet 37 facing the back roller pair 15. The trumpet 37 can move back and forth together with the traverse bar 38 in a direction intersecting the blister yarn 20.

The traverse bar 38 is connected to the cam mechanism 31. Further, the cam mechanism 31 is connected to the servomotor 32. The cam mechanism 31 converts the rotational motion of the output shaft of the servomotor 32 into a reciprocating motion, and the traverse bar 38 is reciprocated by this reciprocating motion. A control unit 34 that controls the operation of each part of the pot spinning frame, including a servomotor driver and a controller (not shown), is connected to the servomotor 32.

Next, the operation of the pot spinning frame according to the first embodiment will be described. As shown in FIG. 1, when the pot spinning machine starts spinning, the top back roller 15a and the bottom back roller 15b, the top middle roller 16a and the bottom middle roller 16b, the top front roller 17a and the bottom front roller 17b have predetermined speeds. Start rotation with. By this operation, the blister thread 20 passes through the trumpet 37, and between the top back roller 15a and the bottom back roller 15b, between the top middle roller 16a and the bottom middle roller 16b, and between the top front roller 17a and the bottom front roller 17b. It is transported by passing through the space in order. Next, the suction pipe 14 sucks air and sucks the coarse yarn. By this shinobi operation, the coarse yarn 20 stretched by each roller enters the shinobi pipe 14 and is conveyed to the pot.

Further, the servomotor 32 is driven after the start of spinning. The rotary motion of the output shaft of the servomotor 32 is converted into a reciprocating motion of the top back roller 15a in the axial direction by the cam mechanism 31, and the traverse bar 38 is reciprocated in the axial direction of the top back roller 15a. As a result, the trumpet 37 fixed to the traverse bar 38 reciprocates in the axial direction of the top back roller 15a, and the coarse yarn 20 is traversed within the width of the top back roller 15a.

By traversing the crude yarn 20 in the axial direction within the width of the top back roller 15a, the crude yarn 20 stays at a certain position of each roller constituting the back roller pair 15, the middle roller pair 16 and the front roller pair 17 for a long time. It is possible to prevent uneven wear of the rollers constituting the back roller pair 15, the middle roller pair 16, and the front roller pair 17 by continuing to abut. In particular, it is possible to prevent uneven wear of the top back roller 15a, the top middle roller 16a and the top front roller 17a coated with rubber.

By the way, as shown in FIG. 3, the position of the blister yarn 20 is far from the central axis A of the suction pipe 14 depending on the timing of the spinning stop such as when the pot is full and the pipe is stopped. It is conceivable that the spinning stops at the timing of traversing to the position. At this time, at the start of the next spinning, the central axis A of the coarse yarn 20 and the suction pipe 14 is displaced, and the coarse yarn 20 and the central axis A are separated from each other, so that there is a high possibility that the suction will fail. ..

FIG. 4 is a graph showing an example of the relationship between the traverse position P of the blister yarn and the spinning time T in a conventional pot spinning machine. The position P1 is one end of the traverse position P of the coarse yarn, and the position P2 is the other end of the traverse position P of the coarse yarn. When the traverse position P is 0, the position is the same as the central axis A. The time T1 is the spinning time T when the pot is spun until the pot is full and the pot is stopped. In this example, when the spinning is continued until the time T1 and the spinning is stopped, the traverse position of the blister yarn becomes P1. In this case, since the crude yarn and the central axis A are separated from each other as shown in FIG. 3, there is a high possibility that the sucking shinobi will fail at the start of the next spinning.

Therefore, in the pot spinning machine according to the first embodiment, the control unit 34 (see FIG. 3) has the current spinning length of the yarn, the current spinning time T, and the servomotor 32 during the spinning operation. Monitor the current traverse position P, etc. based on the position information. Then, as shown by the broken line C in FIG. 5, when it is determined that the traverse cycle of the blister yarn 20 until the time T1 at which the full pipe is stopped is less than the remaining half cycle, the traverse position P is 0 as shown by the line B. At the timing (time T2), the servomotor 32 is stopped to stop spinning. As a result, the round trip of the trumpet 37 of the traverse bar 38 is stopped.

By stopping the trumpet 37 at time T2, the traverse position P of the blister yarn 20 at the time of stopping spinning becomes 0. As a result, the traverse position P of the blister yarn 20 at the start of the next spinning becomes 0 and is close to the central axis A of the suction pipe 14, so that the possibility that the suction fails can be reduced.

When the spinning stop button is pressed by an operator during the spinning operation to stop the spinning, the control unit 34 shown in FIG. 2 continues the spinning operation until the traverse position P becomes 0. , When the traverse position P becomes 0, the servomotor 32 is stopped to stop spinning. As a result, the traverse position P of the blister yarn 20 at the start of the next spinning becomes 0 and is close to the central axis A of the suction pipe 14, so that the possibility of the suction failure is reduced. Can be done.

Further, when the emergency stop button is pressed by the operator during the spinning operation to make an emergency stop, the control unit 34 immediately stops the servomotor 32 and stops the spinning. Then, at the start of the next spinning, the control unit 34 drives the back roller pair 15, the middle roller pair 16, the front roller pair 17 and the servomotor 32, and traverses while discarding the coarse yarn 20 (see FIG. 1). Then, when the traverse position P becomes 0, the traverse is stopped and the sucking shinobi is started. As a result, it is possible to reduce the possibility that the sucking shinobi at the start of the next spinning will fail even when the emergency stop operation is performed.

As described above, the pot spinning frame according to the present invention is a traverse device that traverses the blister yarn 20 in parallel with the rotation axes of the back roller pair 15, the middle roller pair 16 and the front roller pair 17 of the draft device 10 for stretching the blister yarn 20. Since the 30 and the control unit 34 that controls the traverse device 30 so as to align the position of the fiber bundle with the position of the suction tube 14 at the latest at the start of spinning are provided, the suction of the coarse yarn 20 by the suction tube 14 fails. The possibility of doing so can be reduced.

Further, the control unit 34 controls the traverse device 30 so that the position of the blister yarn 20 is aligned with the position of the suction pipe 14 at the time when the spinning is stopped. If the position of the blister yarn 20 is to be aligned with the position of the suction pipe at the start of spinning, it is necessary to discard the blister yarn 20 until the alignment is completed, but in the case of the first embodiment, the next spinning is started. Sometimes it is not necessary to throw away the crude yarn 20. As a result, the consumption of the blister yarn 20 can be reduced.

Further, since the control unit 34 stops the traverse of the coarse thread 20 when adjusting the position of the coarse thread 20 to the position of the suction pipe 14, the control unit 34 sucks the position of the coarse thread 20 without imposing a load on the coarse thread 20. It can be adjusted to the position of the Shino tube 14.

Embodiment 2.
Next, Embodiment 2 of the present invention will be described. In the following embodiments, the same reference numerals as those in FIGS. 1 to 5 are the same or similar components, and thus detailed description thereof will be omitted. The second embodiment accelerates / decelerates the traverse speed with respect to the first embodiment.
As shown in FIG. 6, when the control unit 34 determines that the traverse cycle of the blister yarn 20 (see FIG. 2) until the full pipe stop time T1 is less than the remaining half cycle, the control unit 34 monitors. Control is performed to accelerate the traverse speed based on the current spinning length of the yarn, the traverse position P, the elapsed time of the spinning time T, and the time T1 at which the full pipe is stopped.

Specifically, the control unit 34 increases the rotation speed of the servomotor 32 between the time T3 when the traverse position P immediately before the traverse cycle becomes less than the remaining half cycle becomes 0 and the time T1 when the pipe is fully stopped. .. As a result, by accelerating the reciprocation of the traverse bar 38 and accelerating the traverse speed of the blister yarn 20, the traverse speed of the blister yarn 20 accelerates from time T3 to T0 as shown by line D, and time T1 When the traverse position P becomes 0 in, the spinning is stopped. As a result, it is possible to reduce the possibility that the sucking shinobi at the start of the next spinning will fail as in the first embodiment.

When accelerating the traverse speed, it is accelerated within a range equal to or less than the speed limit recorded in advance in the control unit 34 in order to prevent the coarse yarn 20 from being cut or damaged.

Further, when the control unit 34 determines that the traverse cycle of the crude yarn 20 (see FIG. 2) up to the time when the pipe is fully stopped is less than the remaining half cycle, the control unit 34 monitors the current yarn. It is also possible to control the traverse speed to be reduced based on the spinning length, the elapsed time of the spinning time T, and the time T1 at which the pipe is fully stopped. Specifically, the control unit 34 servos so that the traverse position P becomes 0 at the time T1 when the pipe is fully stopped from the time T4 when the traverse position P immediately before the traverse cycle becomes less than the remaining half cycle becomes 0. The rotation speed of the motor 32 is reduced. As a result, by decelerating the traverse speed of the blister yarn 20 from the time T4 to the time T1, the traverse position P can be set to 0 at the time T1 as shown by the line E. As a result, by setting the traverse position P at the start of the next spinning to 0 as in the first embodiment, the possibility that the sucking shinobi fails can be reduced.

In this way, the control unit 34 accelerates and decelerates the traverse speed of the crude yarn 20 when adjusting the position of the crude yarn 20 to the position of the suction pipe 14, so that the spinning operation is continued until the pipe is fully stopped. , The position of the blister thread 20 can be adjusted to the position of the suction pipe 14.

Embodiment 3.
Next, Embodiment 3 of the present invention will be described. The third embodiment uses a stepping motor as compared with the first and second embodiments.
FIG. 8 shows the traverse device 30 of the third embodiment. The traverse bar 38 is provided with a marker 38a. An optical sensor 33, which is a mark sensor capable of detecting the marker 38a, is provided facing the traverse bar 38. The optical sensor 33 is connected to the control unit 34. The cam mechanism 31 is connected to the stepping motor 35. The stepping motor 35 is connected to the control unit 34. The stepping motor 35 is used in place of the servo motor 32 used in the first embodiment. Other configurations are the same as those in the first embodiment.

Next, the operation of the pot spinning frame according to the third embodiment will be described.
The optical sensor 33 detects the position of the marker 38a from the start of spinning to the stop of spinning. By inputting the position detection result of the marker 38a from the optical sensor 33 to the control unit 34, the control unit 34 can detect the traverse position of the traverse bar 38 provided with the marker 38a.

Therefore, in the third embodiment, the traverse position of the traverse bar 38, that is, the traverse position of the blister yarn 20 can be detected from the position detection result of the marker 38a. Therefore, it is possible to control the traverse as in the first and second embodiments even if the stepping motor 35 is used without using a motor capable of obtaining rotational position information such as the servo motor 32 (see FIG. 2). it can.

Although the stepping motor 35 was used in the third embodiment, other types of general-purpose motors may be used. Further, in the third embodiment, the marker 38a is provided on the traverse bar 38, and the optical sensor 33 is provided for detecting the marker 38a. However, the traverse bar 38 is provided with another type of sensor such as a magnetic sensor. The position may be detected.

Embodiment 4.
Next, Embodiment 4 of the present invention will be described. The fourth embodiment is provided with an electromagnetic clutch as compared with the third embodiment.
An electromagnetic clutch 36 capable of disconnecting the power from the general-purpose motor 39 to the cam mechanism 31 is provided between the general-purpose motor 39 and the cam mechanism 31. The electromagnetic clutch 36 is connected to the control unit 34. Other configurations are the same as those in the third embodiment.

Next, the operation of the pot spinning frame according to the fourth embodiment will be described. When the reciprocating operation of the traverse bar 38 is stopped, the control unit 34 disengages the electromagnetic clutch 36. As a result, the traverse bar 38 can be stopped and the traverse of the blister yarn 20 can be stopped without stopping the general-purpose motor 39.

In the fourth embodiment, the stepping motor 35 was used as the power for the traverse bar 38, but instead of this, the back that operates the bottom back roller 15b, the bottom middle roller 16b, and the bottom front roller 17b (see FIG. 1). The power of a roller drive motor (not shown) may be used. Specifically, the output torque of the output shaft of the back roller drive motor is input to the electromagnetic clutch 36. Although the back roller drive motor continues to be driven during the spinning operation, the traverse of the coarse yarn 20 can be arbitrarily stopped by cutting off the power as needed by the electromagnetic clutch 36.

Although the electromagnetic clutch 36 was used in the fourth embodiment, a power disconnecting means such as another type of clutch may be used.

Further, in the first to fourth embodiments, the crude yarn 20 constitutes a fiber bundle, but other types of fiber bundles may be used. Further, in the first to fourth embodiments, the cam mechanism 31 is used to convert the rotary motion into a linear motion, but another power transmission mechanism such as a slider / crank mechanism may be used.

10 Draft device, 14 Suction pipe, 15 Back roller pair (roller pair), 16 Middle roller pair (roller pair), 17 Front roller pair (roller pair), 20 Crude yarn (fiber bundle), 30 Traverse device, 34 Control Department.

Claims (4)

A traverse device that traverses the fiber bundle parallel to the rotation axis of the roller pair of the draft device that stretches the fiber bundle.
A pot spinning frame including a control unit that controls the traverse device so as to align the position of the fiber bundle with the position of the suction tube at the latest at the start of spinning. The pot spinning frame according to claim 1, wherein the control unit controls the traverse device so that the position of the fiber bundle is aligned with the position of the suction tube at the time when spinning is stopped. The pot spinning frame according to claim 1 or 2, wherein the control unit stops traversing the fiber bundle when the position of the fiber bundle is adjusted to the position of the suction tube. The pot spinning frame according to claim 1 or 2, wherein the control unit accelerates or decelerates the traverse speed of the fiber bundle when the position of the fiber bundle is adjusted to the position of the suction tube.

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