JPS59157330A - Driving mechanism for draft rolls in spinning frame - Google Patents

Abstract

PURPOSE:A motor for driving draft rollers and another motor for driving spindles are installed separately in the spinning frame, and they are controlled in their rotations so that the ratio of the rotation numbers attains a prescribed value to facilitate changes in conditions of spinning operations and reduce yarn breaks at the start and stop. CONSTITUTION:In a spinning frame where a silver or roving is drafted with plural couples of rollers 1,1'; 2,2'; 3,3', spun with the spindle 8 and wound up around the bobbin fitted to the spindle, the motor 10 for driving bottom rollers in the draft part 1, 2 and 3 and the other motor 4 for driving spindles 8 are installed separately and controlled by the controlling means 13 so that the ratio of the rotation number of the spindle 8 to the front bottom rollers becomes a previously set value.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a spinning machine such as a roving frame or a spinning frame, in which a sliver or roving is drawn by a plurality of draft rollers having different rotational speeds and wound onto a bobbin attached to a spindle while being twisted. The present invention relates to a mechanism for controlling the drive of the spindle, draft roller, etc.

BACKGROUND ART In general, in spinning machines, and in particular in spinning machines, as shown in FIG. A front bottom is passed between the middle bottom roller 2 and the middle roller 2', which are rotated faster than the middle rollers 2 and 2', to provide a preparatory draft; The main draft is given by the front roller 3.

It is drawn out from 3' and twisted to form a thread. A drive shaft 5 connected to a drive motor 4
, a pulley 6 which is properly attached to the same 5, and a bobbin (path shown) attached to a spindle 8 which is rotated via a driving tape 7. The thread is wound up on a bobbin (path shown).

The spinning conditions according to the desired yarn count or fiber type are determined by each bottom roller 1, which determines the drawing state of the roving box.
, 2.3 and the number of twists between the front bottom roller 3 and the drive shaft 5.

Conventionally, as shown in FIG. 1, the plurality of bottom rollers 1, 2, and 3 receive their driving force from a drive motor 4 at the same end side via a drive shaft 5 and a gear mechanism. The other end of .3 is rotatably supported. However, in order to change the spinning conditions, it is necessary to replace the change gear among the gears in the gear mechanism. Therefore,
In order to relieve this complexity, a method can be considered in which the bottom rollers 1, 2 and 3 are individually driven by a synchronous motor. However, this driving method induces non-uniformity of the yarn due to mismatch in synchronization, and is difficult to put into practical use, especially because of the difficulty in synchronizing when starting and stopping the machine.

On the other hand, the number of twists determined by the rotational speed ratio of the front bottom roller 3 and the drive shaft 5 does not require strict setting as in the draft state, and the permissible variation range of the number of twists is smaller than the permissible variation range of the draft. Much thicker. Therefore, as shown in FIG. 1, the front bottom roller 3 and the drive shaft 5 are connected to the gear 9V? - There is no need to limit the method to driving by a single drive motor 4 with two operative connections.

Furthermore, when changing the rotational speed ratio between the front bottom roller 3 and the drive shaft 5 due to changes in spinning conditions, the gear 9 must be replaced in the illustrated example, and the twisting direction of the yarn, so-called When switching between the S twist and the opposite two twists, operations such as adding or removing intermediate gears must be performed, and these operations are extremely troublesome.

Purpose The present invention has been made in consideration of the above facts,
The purpose of this is to reduce the number of yarn breakages when starting or stopping the machine, and to simply change the number of yarn twists or change the twisting direction without having to do the troublesome work of replacing the change gear. This invention relates to a drive mechanism for a draft roller or the like in a spinning machine that can be operated only by inputting electrical signals.

Structure In order to achieve the above object, the present invention provides a drive motor for driving a plurality of bottom rollers forming the draft row 2 mechanism, separately from a drive motor for driving the spindle,
A configuration is adopted in which a control device is provided to control the rotation speed ratio between the rotation speed and the front bottom roller to be the same as a preset rotation speed ratio.

Embodiment Hereinafter, an embodiment embodying the present invention will be described with reference to FIG. 2. The same parts as those in the conventional structure are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this embodiment, the bottom rollers 1, 2.3 and the drive shaft 5 (hereinafter referred to as spindle drive shaft) are not operatively coupled, and instead, the front bottom roller 3 is connected to the drive morph 4 (hereinafter referred to as spindle drive motor). The drive motor 10 is connected to a separate drive motor 10 (which is capable of forward and reverse rotation). or,
The spindle drive shaft 5 and the flow/tobottom roller 3 are each provided with a rotation speed detection device 11, 12, such as a magnetic or optical system, and the detection device 11 emits a number of pulses A1 per rotation of the spindle drive shaft 5, and detects the number of pulses. The device 12 emits a number of pulses A2 per revolution of the front bottom roller 3. Both pulse signals are sent to a control circuit 13 that controls the rotation of both drive motors 4 and 10.

Now, when the start signal is input to the control circuit 13, the circuit 13 sends an operation command to the spindle drive motor 4, and after a preset time, also sends an operation command to the bottom roller drive motor 10. That is, the bottom roller drive motor 10
It is started slightly later than the Vi spindle drive motor 4. Therefore, at the front bottom roller, the twisted fleece lj is in a taut state, and thread breakage, which tends to occur when starting the machine, does not occur.

The rotation speed of the spindle drive motor 4 is set in advance, and the rotation speed per unit time of the spindle drive shaft 5 rotated by the spindle drive motor 4 is Nl, and the front bottom roller 30 is
If the number of rotations per unit time is N'2, then the detection device 11
is A1・Ni (-Pl) per unit time, detection device 1
2 emits the number of pulses of A2·N2 (=P2) per unit time. A setting signal indicating the set ratio K of the rotation speed of the spindle drive shaft 5 to the rotation speed of the front bottom roller 3 (that is, the rotation speed ratio of the spindle 1 drive shaft 5 and the front bottom roller 3) is transmitted to the control circuit 13 by button operation or the like. If it is input to , this circuit 13 indicates that the rotation speed of the bottom roller 3 is low, and it sends a speed increase command to the bottom roller drive motor 10, so that P1'<P2, that is, N
If 1 < x, then the set value is 2. This indicates that the rotation speed of the front bottom roller 3 is high, and a deceleration command is sent to the drive motor 10.

When a stop signal is input to the control circuit 13, the circuit 13 sends an operation stop command to the bottom roller drive motor 1o.
After a preset time, an operation stop command is also sent to the spindle drive motor 4. That is, the spindle and drive motor 4 Vi stop a little later than the bottom roller drive motor 10 . Therefore, the twisted fleece F between the front bottom roller 3 and the spindle drive shaft 5 is in a relaxed state, and yarn breakage, which is likely to occur when the machine is stopped, does not occur.

Note that if the spindle drive motor 4 is reversed based on a reverse rotation operation command from the control circuit 13, the direction in which the yarn is twisted is reversed.

In this embodiment, the rotational relationship between the front bottom roller 3 and the spindle drive shaft 5 when the machine is started and stopped is such that the start and stop of the bottom roller 3 and the drive shaft 5 are staggered by a preset time difference. Since it is programmed in a shape, it is possible to suppress the occurrence of thread breakage when starting and stopping the machine. The programming method is not limited to this embodiment. For example, at startup, when the number of pulses from the detection device 11 that detects the rotation speed of the spindle drive shaft 5 reaches a preset value, the - An operation command is sent from the control circuit 13 to the roller drive motor 10, and when the motor is stopped, when the number of pulses from the detection device 12 that detects the rotation speed of the front bottom roller 3 reaches a preset value, the spindle A stop command may be sent to the first drive motor 4 from the control circuit 13.

The setting of the number of twists can be changed by simply inputting a setting signal indicating the rotational speed ratio between the spindle drive shaft 5 and the front bottom roller 3 to the control circuit 13 by operating a button or the like.
The twisting direction of the yarn is also changed by switching the spindle and the drive motor 4 between forward and reverse directions, and this operation is very easy, unlike the conventional structure that requires the troublesome work of replacing the change gear.

In the embodiment described above, a pair of rotation speed detection devices 11 and 12 were provided to control the feed bank 115, but the front pot roller detection device 12td may be omitted. Also, instead of setting the rotation speed of the spindle drive motor 4 and controlling the rotation of the bottom roller drive motor 10 by feedbank,
The rotation speed of the spindle drive motor 4 may be set to 0 and the rotation of the spindle drive motor 4 may be controlled by feed bank control.

In ring sheath spinning machines and the like, conventionally, the ring plate has obtained its driving force from the drive motor 4. However, fluctuations in the lowering speed IW of the ring plate determine the pinch of the yarn wound onto the bobbin. As in the case of the number of twists, the permissible range is much larger than the permissible variation range of the draft, and it is possible to drive the ring plate by a drive motor separate from the spindle and the drive motor 4. Alternatively, the bottom roller 1 drive motor 10/spray 1.
may be driven once.

Effects As detailed above, the present invention is provided with a drive motor for driving a plurality of bottom rollers forming a draft roller mechanism in addition to the seven spindles and a drive motor for driving, and the spindle and front bottom roller are connected to each other. Since a control means is provided to control the rotation speed ratio to be the same as a preset value, the troublesome work of changing the setting of the number of yarn twists or changing the twisting direction is eliminated. This can be done simply by inputting an electrical signal without having to do anything. Furthermore, in the present invention, the rotational relationship between the front bottom row 23 and the spindle drive shaft 5 can be programmed, and the occurrence of yarn breakage when the machine is started or stopped can be suppressed.

[Brief explanation of drawings]

FIG. 1 is a road diagram showing a conventional drive system of a spindle and draft roller, and FIG. 2 is a road diagram showing an embodiment embodying the present invention.

Claims (1)

[Claims] 1. Separately from the drive motor for driving the spindle, a drive motor for driving a plurality of bottom rollers constituting a draft roller mechanism is provided, and the ratio of the rotation speeds of the spindle and the front bottom roller is set in advance. 1. A drive mechanism for a draft roller, etc. in a spinning machine, characterized in that it is provided with a control means for controlling the rotation speed ratio to be the same as the rotation speed ratio. 2. In the drive mechanism described above, the drive motor of the draft roller mechanism and the drive motor for driving the spindle are controlled to start and stop when they are started and stopped. A drive mechanism for a draft roller or the like in a spinning machine according to claim 1, which is provided with means for programming.