JP2559425B2 - Spinning machine - Google Patents

Description

The present invention relates to detection of the rotation speed of a high-speed winding spindle, and is suitable for an ultra-high-speed ring spinning frame in which the spindle and the draft part are driven by separate electric motors. The present invention relates to a motor control system.

[Conventional technology]

In the multi-weight tape dedicated motor drive system, it is possible to attach a rotation speed detection device to the spindle drive motor, but the drive motor is special and often comes with a brake, which makes the structure complicated and expensive. Will end up.

Further, the difference in the actual rotation between the tape and the spindle of the drive motor, such as all of the spindles, causes a decrease in accuracy and a reduction in product quality.

Examples of related devices of this type include JP-A-59-20429 and JP-A-60-155729.

[Problems to be solved by the invention]

The above-mentioned conventional technique has a problem in that the following points are not taken into consideration.

1) In open-loop control, out-of-synchronization of each drive motor is apt to occur, especially from start-up or fall-to-stop, which may lead to product quality deterioration and even yarn breakage. In particular, this yarn breakage is fatal to automatic continuous operation.

2) If the rotation detecting device is attached to the spindle driving electric motor, the electric motor becomes special, and if it is equipped with a brake, the structure becomes more complicated and the cost becomes higher.

Further, due to the slip between the spindle driving motor pulley and the tape, the difference in the actual number of rotations occurs and the quality of the product deteriorates.

3) Further, when the same electric power source is used to control each driving electric motor, the slip of each driving electric motor itself cannot be controlled, which makes synchronous operation difficult.

 The object of the present invention is to solve these problems.

[Means for solving problems]

The above-mentioned purpose is driven by the same tape as the spindle drive, a rotation speed detection device is mounted on a tension pulley that requires at least one rotation speed, and a rotation speed detection signal detected by this rotation speed detection device is used to drive the draft part drive motor. It is achieved by controlling the rotation speed of the.

[Action]

By mounting the rotation speed detection device on the tension pulley of the drive tape of the spindle, the influence of the slip between the pulley of the motor for driving the spindle and the tape can be eliminated, and highly accurate synchronous operation becomes possible.

In addition, the driving electric motor is not special, and even if a plurality of electric motors are used, it is possible to use the same specifications for all.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, 1 is a spindle, 2 is a bobbin attached to the spindle, 3 is a thread wound on the bobbin 2, 4 is a driving electric motor for the spindle 1, 5 is a pulley of the driving electric motor 4, and 6 is a driving electric motor 4. A tape (belt) 7 wound around the spindle 1 is a tension pulley for applying tension to the tape, and a rotational speed detecting device having, for example, a coaxial structure is attached to the tension pulley. Reference numeral 8 is a weight, which can be adjusted so as to give an appropriate tension to the tape 6. 9 is a variable frequency power source for driving the driving electric motor 4,
Reference numeral 10 is a speed (frequency) setting device of the driving motor 4.

Numeral 11 is a draft roll, which is one in this figure, but usually two to three more rolls constitute a draft part.

Reference numeral 12 is a drive motor for the draft roll, 13 is a variable frequency power source for controlling the drive motor 12, and a speed detection signal is taken in from a rotation speed detection device assembled to the tension pulley 7, and the drive motor is driven at a rotation speed proportional to the spindle 1. It supplies AC power of the necessary frequency so that 12 synchronous operations can be performed.

It is to be noted that FIG. 2 shows a schematic plan view of the device of the present embodiment, and in this figure, one driving motor 4 is provided with a plurality (eight).
The tape 6 is hung over the spindle 1 and the respective drives. Further, in the embodiment, an induction motor is used as each of the driving electric motors 4 and 12, and as the rotation speed detection device, a generator type or a pulse generator type using a magnetic sensor, an optical sensor or the like is used. It is conceivable to use a known method such as.

According to such an embodiment, the operating speed of the spindle 1 can be detected by the rotation speed detection device mounted on the tension pulley 7 driven by the same tape 6 as that driving each spindle 1. The drive motor for driving the draft part is controlled based on the detection signal detected by the rotation speed detection device. Therefore, according to the rotation speed detecting device provided on the tension pulley 7, since it is driven by the same tape 6 as the spindle 1, the slip between the pulley 5 and the tape 6 of the driving motor 4 of the spindle 1 is prevented. It is possible to obtain a speed signal that is not included and is proportional to the actual rotation of the spindle 1. From this, based on the speed signal detected by the rotation speed detection device, the rotation of the spindle 1 is made to follow the rotation of the spindle 1 over the respective periods of rising → falling → stop of the spinning machine, so that the electric motor 12 for driving the draft part is driven. The operation control is performed, and the synchronous operation between the spindle 1 and the draft part becomes possible. As described above, in the embodiment, the synchronous operation can be performed with high accuracy, the quality of the product can be improved, and the yarn breakage can be eliminated, so that the apparatus can be optimally continuously and automatically operated.

Further, since the continuous operation is optimally performed, the quality of the product can be made uniform and the yield of the product can be increased.

〔The invention's effect〕

According to the present invention, the rotation detecting device is attached to the tension pulley that is simultaneously driven by the tape that drives the spindle, and the draft part is synchronously driven by the signal, so that each drive is not affected by the slip of the tape. The synchronous operation of the electric motor can be performed.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining the constitution of one embodiment of the present invention, and FIG. 2 is a schematic diagram showing a plane constitution for explaining the tape passing of the same embodiment. 1 ... spindle, 2 ... bobbin, 3 ... thread, 4 ... spindle drive motor, 5 ... pulley, 6 ... tape, 7 ... tension pulley equipped with a rotation speed detection device,
11 …… Draft roll, 12 …… Driving part drive motor.

Claims (1)

(57) [Claims] 1. A draft part, a plurality of take-up spindles, a tension pulley, a first electric motor for driving the draft part, and a plurality of take-up spindles and the tension pulleys via the same tape. A second electric motor, a rotation detector mounted on the tension pulley to detect the rotation speed of the tension pulley, and the rotation speed of the first electric motor based on the rotation speed detected by the rotation detector. A spinning machine comprising a control device for controlling so as to synchronize with a take-up spindle.