JP6670541B2 - Lap cutting method at lap change in comba - Google Patents

Description

  The present invention relates to a lap cutting method at the time of lap exchange in a comber.

  In the comber, when the number of wraps in use, that is, the old wrap is reduced, a lap splicing is performed in which the end of the old wrap (the old wrap end) is overlapped with the start end of the new wrap winding (the new wrap end). When performing this lap splicing automatically, it is necessary to automatically cut the old lap.

  Conventionally, as a method of automatically cutting an old wrap, a method in which a lap bobbin is pressed by a pair of lap rollers at the time of cutting the old lap, and in that state, the lap bobbin is cut in a reverse direction in which a wrap sheet is wound. Is disclosed. More specifically, when the wrap bobbin on the wrap roller approaches empty, the operation of the machine base is stopped, and the wrap sheet being supplied is pressed and held by the pipe on the movable guide plate disposed at the guide position. Next, the air cylinder of the bobbin pressing mechanism is operated, and the pressing lever is disposed at a pressing position where the wrap bobbin is pressed against the lap roller via the roller. Then, in this state, the lap motor is driven, the lap bobbin is rotated in the direction of winding the lap sheet, and the lap sheet is cut between the position pressed by the pipe and the contact position of the lap bobbin and the lap roller. Is done.

JP-A-5-117921

  The method disclosed in Patent Document 1 requires a bobbin pressing mechanism (pressing device). As the bobbin pressing mechanism, a roller for pressing the wrap bobbin against the wrap roller, a pressing lever for pressing the roller, and a pressing lever for pressing the pressing lever to the pressing position. And a complicated mechanism including an air cylinder driven to the standby position.

  Further, when the bobbin pressing mechanism (pressing device) is not provided, when the lap bobbin is reversely rotated via the wrap roller, only the self-weight of the bobbin holds the lap bobbin on the wrap roller. If the weight per unit length of the wrap is large or the fiber length is long, the wrap is strong and slips only with the bobbin's own weight, so that the wrap cannot be cut or the remaining wrap surface is disturbed.

  The present invention has been made in view of the above-mentioned problem, and an object of the present invention is to stably cut a wrap by using the operation of another device provided in a comber without a pressurizing device. It is an object of the present invention to provide a lap cutting method at the time of exchanging laps in a comber capable of performing the above.

  A lap cutting method at the time of lap exchange in a comber that solves the above problem includes a carrier roller and a top roller between a lap roller and a nipper device, and the lap is gripped by the carrier roller and the top roller. This is a lap cutting method at the time of lap replacement in a comber that cuts the lap by reverse rotation of a lap roller. Then, before the reverse rotation of the wrap roller, the wrap is stretched by stretching the wrap with a difference in rotational speed between the wrap roller and the carrier roller.

  According to this configuration, when the wrap is cut by the reverse rotation of the wrap roller when changing the wrap of the comber, the wrap is stretched by the difference in rotational speed between the wrap roller and the carrier roller before the reverse rotation of the wrap roller. For this reason, the wrap has a reduced strength compared to the state before being stretched, so that it becomes easy to cut. In this state, the lap roller is rotated in reverse, so there is no pressing device for pressing the lap bobbin against the lap roller, and the force for pressing the lap bobbin against the lap roller is only the own weight of the lap bobbin having the remaining lap. In addition, the wrap can be reliably cut without slipping of the wrap bobbin due to the reverse rotation of the wrap roller. Therefore, even without the pressurizing device, the lap can be stably cut using the operation of another device provided in the comber.

  The stretching of the wrap may be performed by stopping only the wrap roller and driving a drive unit subsequent to the carrier roller at a lower speed than a normal operation speed. According to this method, the lap is pulled by the carrier roller and the top roller in a state where the lap bobbin is stopped by driving the drive unit after the carrier roller at a lower speed than the normal operation speed while the lap roller is stopped. Is stretched. In this method, after stopping the operation of the comber, the lap roller is not driven, and the driving unit after the carrier roller is driven at a lower speed than the normal operation speed. The lap roller may be stopped, and in that state, the drive units subsequent to the carrier roller may be driven at a lower speed than the normal operation speed.

  The wrap stretching may be performed by providing a difference in rotation speed between the wrap roller and the carrier roller during a comba operation stop operation. Here, "giving the rotational speed difference between the wrap roller and the carrier roller" includes the case where the carrier roller is driven while the wrap roller is stopped. In this method, during the operation of stopping the operation of the comber for replacing the wrap, by providing a difference between the rotation speeds of the wrap roller and the carrier roller, when the operation of the comber is stopped, the wrap is moved between the wrap roller and the carrier roller and the wrap roller. It is in a state of being stretched between the top roller. Then, after the operation is stopped, the lap roller can be reversely rotated so that the lap cutting can be performed favorably.

  ADVANTAGE OF THE INVENTION According to this invention, a lap | wrap can be cut | disconnected stably using operation | movement of the other apparatus equipped with the comber, without a pressurizing device.

The schematic side view of a combing head. FIG. 4 is a schematic diagram illustrating a state near a lap roller in a state where the lap roller is stopped for lap replacement. The schematic diagram which shows the state at the time of lap cutting.

  An embodiment of the present invention will be described below with reference to FIGS. In the specification of the present application, for convenience, the left side of FIG. 1 will be described as front, the right side as rear, and the upper and lower sides as upper and lower, respectively.

The comber generally includes a plurality (for example, eight) of combing heads 11.
As shown in FIG. 1, the combing head 11 includes a pair of wrap rollers 12 on which a wrap bobbin B around which a wrap L is wound is placed, and a combing unit 13 is provided below (downstream) the wrap rollers 12. Have been. The combing unit 13 includes a nipper device 14, a combing cylinder 15, detaching rollers 16 disposed in front and rear two rows in front of the combing cylinder 15, and a top comb 17.

  The lap roller 12 is driven by a lap roller motor that can be driven independently of the combing unit 13. The lap roller motor is configured to be able to be driven to rotate forward and backward, and is driven via an inverter device controlled based on a command from the control device.

  The nipper device 14 has a feed roller 18 and a nipper frame 19 that is disposed above and below the combing cylinder 15 so as to be able to swing forward and backward. The nipper frame 19 is provided with a bottom nipper 20 at the front bottom thereof. . The nipper frame 19 is provided with a top nipper 21 which opens and closes at a predetermined timing in synchronization with the forward / backward swing of the nipper frame 19 and cooperates with the bottom nipper 20 to hold the lap L.

  A carrier roller 22 and a top roller 23 are provided in front of the wrap roller 12 and above the nipper device 14. The carrier roller 22 is provided so as to be rotatable independently of the wrap roller 12. The top roller 23 is provided so as to be movable between an operation position where the top roller 23 is pressed against the carrier roller 22 from above and a retreat position where the top roller 23 has moved upward from the operation position. The top roller 23 is held at the retracted position except for the operation of cutting the lap when replacing the lap, and the lap L can freely move on the carrier roller 22.

  A suction nozzle 24 is provided below the wrap bobbin B placed on the wrap roller 12 with its tip located between the wrap rollers 12. The suction nozzle 24 has an opening extending over the range of the length of the wrap bobbin B in the axial direction, and is connected to a negative pressure source (not shown) via a hose 25.

Next, the operation of the device configured as described above will be described.
When the lap amount of the lap bobbin B decreases to a preset value by the operation of the comber, the lap replacement is performed. In order to replace the wrap, it is necessary to cut the wrap L from the wrap bobbin B on the wrap roller 12 through the carrier roller 22 to the nipper device 14 between the wrap roller 12 and the carrier roller 22.

  In this embodiment, the operation of stopping the comber for replacing the lap is different from the operation for stopping the operation other than the replacement of the lap, as shown in FIG. The drive unit performs a low-speed operation of driving at a lower speed than the normal operation speed for a predetermined time and then stops. The predetermined time is, for example, a time during which the nipper device 14 performs several nips. The wrap L is stretched, for example, by about 5 mm by one nip operation of the nipper device 14. As a result, in a state where the operation of the comber is stopped, the wrap L is stretched between the carrier roller 22 and the wrap roller 12, and the stretched portion of the wrap L has a reduced strength. It will be in an easy state.

  Next, as shown in FIG. 3, in a state in which the carrier roller 22 and the top roller 23 hold the wrap L and the rotation is stopped, the lap roller motor is driven in the reverse direction, and the lap roller 12 is rotated in the reverse direction. The bobbin B is rotated in a direction for winding the wrap L. As a result, the lap L is slipped by the lap bobbin B at a position where the lap L is stretched and weakened during the operation stop operation, that is, at a position between the grip position of the carrier roller 22 and the top roller 23 and the front lap roller 12. Disconnected without any

  When the wrap L is cut by the reverse rotation of the wrap roller 12 and the wrap bobbin B slips and the remaining wrap surface is disturbed, when the remaining wrap is sucked and removed by the suction nozzle 24, the wrap L is clogged by the suction nozzle 24. There is. However, when the wrap L is cut by the reverse rotation of the wrap roller 12, slippage of the wrap bobbin B does not occur, so that clogging of the suction nozzle 24 is prevented.

  After cutting the wrap L, the wrap L remaining on the wrap bobbin B is removed by suction by the suction nozzle 24. Then, after the wrap bobbin B from which the wrap L has been sucked and removed is discharged from the wrap roller 12, the full wrap bobbin is placed on the wrap roller 12, and the lap splicing operation is performed. Start operation is resumed.

According to this embodiment, the following effects can be obtained.
(1) The lap cutting method at the time of lap exchange in a comber is such that a carrier roller 22 and a top roller 23 are provided between the lap roller 12 and the nipper device 14, and the lap L is gripped by the carrier roller 22 and the top roller 23. This is a lap cutting method at the time of lap replacement in a comber that cuts the lap L by reverse rotation of the lap roller 12. Then, before the reverse rotation of the wrap roller 12, the wrap L is stretched to extend the wrap by the difference in rotation speed between the wrap roller 12 and the carrier roller 22.

  According to this configuration, the wrap L has a reduced strength compared to the state before being stretched, so that the lap L is easily cut, and the lap roller 12 is rotated in the reverse direction in this state. Therefore, there is no pressure device for pressing the wrap bobbin B against the wrap roller 12, and even if the force for pressing the wrap bobbin B against the wrap roller 12 is only the own weight of the wrap bobbin B having the remaining wrap, the wrap roller 12 , The wrap L can be surely cut without the wrap bobbin B slipping. Therefore, even without the pressurizing device, the lap L can be stably cut using the operation of another device provided in the comber. Further, since there is no slip, the surface of the remaining wrap of the wrap bobbin B is not disturbed, and it is possible to prevent the wrap L from clogging the suction nozzle 24 when the suction wrap 24 removes the remaining wrap by suction.

  (2) The wrap L is stretched by applying a difference in rotation speed between the wrap roller 12 and the carrier roller 22 during the operation of stopping the operation of the comber. With this method, when the operation of the comber is stopped, the wrap L is stretched between the wrap roller 12 and the carrier roller 22. Therefore, the operation time for lap cutting is shorter than in the method of performing stretching after stopping the operation of the comber. Then, after the operation is stopped, the lap L can be satisfactorily cut by reversing the lap roller 12.

  (3) As a method of providing a rotational speed difference between the wrap roller 12 and the carrier roller 22 during the operation of stopping the comber, the lap roller 12 is stopped first, and the drive units after the carrier roller 22 are operated at lower than the normal operation speed. Drive at low speed. Therefore, control is simplified as compared with the case where drive control is performed such that the lap roller 12 rotates slower than the carrier roller 22 in a state where the lap roller 12 and the drive unit after the carrier roller 22 are synchronized.

The embodiment is not limited to the above, and may be embodied as follows, for example.
As a method of extending the lap L during the operation of stopping the comber, instead of completely stopping the lap roller 12 first, deceleration of the operation after the carrier roller 22 only for a few nip operations before the stop, and The driving of the comber may be stopped after the lap roller 12 is driven at a low speed without synchronizing the deceleration of the roller 12.

  The extension of the lap L is performed by stopping the comber operation in the same manner as in the operation of stopping the comber except at the time of lap replacement, and then, while the lap roller 12 is stopped, the drive unit after the carrier roller 22 is operated at the normal operating speed. It may be performed by driving at a lower speed. In this case, the operation stop operation at the time of lap replacement can be performed in the same manner as the operation stop operation other than the lap exchange.

  The lap exchange is not limited to the spinning of the same type, but may be the lap exchange for the type change. In this case, the lap replacement is not always performed while the lap bobbin B being spun is almost empty.

The following technical idea (invention) can be understood from the above embodiment.
(1) In the invention according to claim 1 or 2, in the stretching of the wrap, after the comber is stopped by a normal operation stop operation, the lap roller is stopped, and the drive unit after the carrier roller is operated in the normal operation. This is done by driving at a lower speed than the speed.

  L: wrap, 12: lap roller, 14: nipper device, 22: carrier roller, 23: top roller.

Claims (2)

A carrier roller and a top roller are provided between the wrap roller and the nipper device, and in a state where the wrap is gripped by the carrier roller and the top roller, when the lap is replaced in a comber that cuts the lap by reverse rotation of the lap roller. A lap cutting method,
Before cutting the wrap by the reverse rotation of the lap roller, perform stretching wrap stretching the lap at a rotational speed difference between the lap rollers and the carrier roller,
The method of cutting laps at the time of replacing laps in a comber, wherein the wrap extension is performed by stopping only the lap rollers and driving a drive unit subsequent to the carrier roller at a lower speed than a normal operation speed . The lap cutting method according to claim 1, wherein the wrap stretching is performed by giving a rotational speed difference between the wrap roller and the carrier roller during a comber operation stop operation.