JP2949919B2 - Spindle drive of spinning machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle driving device for a spinning machine such as a spinning machine or a twisting machine, and more particularly to a spindle driving device for a spinning machine in which each spindle is driven by a single motor.

[0002]

2. Description of the Related Art Conventionally, as a method for driving a spindle of a spinning machine, a belt drive system in which a drive belt common to a plurality of weights or all weights is pressed against a spindle to rotate the spindle is used. However, in the belt driving method, the transmission efficiency between the belt and the driving pulley, the guide pulley, or the spindle is poor, so that not only the power consumption per spindle is increased, but also the noise due to the frictional noise of the belt is large and the working environment is deteriorated. is there. Further, since a large radial load acts on the bearing that supports the spindle, there is a problem that the bearing is worn out early. When the spindle is driven at a high speed, these problems become more remarkable.

[0003] In order to solve the above-mentioned problems, there has been proposed an apparatus in which a drive motor is provided for each spindle, and the drive motor is driven by a single inverter (variable frequency power supply) at a variable speed (for example, Japanese Patent Laid-Open Publication No. H11-163873). Kaisho 55-40852
No.).

[0004]

If the spindles have the same mechanical resistance, thread tension, etc., and the characteristics of the drive motors provided for each spindle are the same, the same speed (voltage , Frequency), the spindle rotation speed of each weight becomes equal.
However, there are variations in the mechanical resistance, thread tension, etc. of each weight, and the characteristics of the drive motor. Even if each motor is driven and controlled by the same speed command from one inverter, the spindle rotation speed of each weight varies. Occurs. As a result, there is a problem in that the twist of the product yarn is varied, and the yarn quality is reduced between the yarns spun on the same machine, thereby deteriorating the yarn quality.

As a method of solving this problem, there is a method of increasing the torque of the drive motor to reduce the variation in the number of revolutions due to the difference in load, but it is not practical because the power consumption of the drive motor increases. Further, a method is conceivable in which an inverter is provided for each drive motor, the number of revolutions of each spindle is detected, and drive control is performed so that the number of revolutions of each spindle becomes a predetermined number of revolutions. However, there is a problem in that providing an inverter for each drive motor increases the cost, and when many small inverters are provided, the efficiency of the inverter is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a spinning machine having a drive motor for each spindle so as to eliminate variations in spindle rotation speed between spindles. It can eliminate variation in yarn quality,
Another object of the present invention is to provide a spindle driving device for a spinning machine which is inexpensive.

[0007]

In order to achieve the above object, the present invention provides a spindle drive motor provided for each spindle, an inverter for driving the spindle drive motor at a variable speed, and a speed control for the inverter. A speed setting unit for giving a command, a rotation speed detection unit provided for each spindle, a voltage transformation unit provided for each spindle to change an output voltage to a spindle drive motor, and a signal from the rotation speed detection unit And a comparison unit that compares a signal corresponding to the target rotation speed, a rotation speed adjustment unit that adjusts an output voltage of the transformer so that the spindle rotation speed becomes the target rotation speed, and the rotation speed adjustment unit. And a rotation speed command section for outputting target rotation speed data.

[0008]

In the apparatus according to the present invention, the spindle of each weight is driven by a single spindle drive motor, and each spindle drive motor is driven by electric power supplied from a common inverter to control the number of rotations provided for each weight. Variable speed drive is performed via the adjustment unit. The inverter outputs the frequency specified by the speed setting unit and the voltage corresponding to the frequency, and is input to the spindle driving motor via the rotation speed adjusting unit. The rotation speed of each spindle is detected by a rotation speed detection unit provided for each spindle. The rotation speed command unit outputs target rotation speed data common to each rotation speed adjustment unit. The rotation speed adjustment unit compares the signal from the rotation speed detection unit with a signal corresponding to the target rotation speed data in a comparison unit, and outputs the output voltage of the transformer unit so that the spindle rotation speed of the weight becomes the target rotation speed. Adjust

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. Each spindle 1 of the spinning machine is provided with a spindle driving motor 2, and each motor 2 is provided with a rotation speed detection unit 3 for detecting the rotation speed of the spindle 1. An induction motor is used as the spindle driving motor 2, and the rotation speed detecting unit 3 is configured by a tacho generator. Each of the spindle driving motors 2 is connected to a rotation speed adjusting unit 5 via a motor power supply line 4. The rotation speed adjusting unit 5 includes a variable resistor 6 as a transformer, and a rotation speed setting unit 8 that outputs a voltage signal corresponding to target rotation speed data output from a rotation speed command unit 7 described later.
And the output signal of the rotation speed setting unit 8 and the rotation speed detection unit 3
And a comparator 9 for comparing the output signal of the variable resistor 5 and adjusting the resistance value of the variable resistor 5 based on the deviation. Each variable resistor 6 is connected to a common inverter 11 via a power supply line 10, and the inverter 11 is connected to a speed setting unit 12. Speed setting unit 1
2 is input to the input device 13 shift data of the spindle rotation speed corresponding to the operation conditions of the spinning machine, and the inverter 11 outputs a current having a frequency for driving the spindle drive motor 2 at a rotation speed corresponding to the shift data. Thus, the inverter is controlled.

The rotation speed command unit 7 receives the output signal from each of the rotation speed detection units 3 to calculate the rotation speed of each spindle, and compares the spindle rotation speed of each weight to determine the minimum rotation speed. The rotation speed data is output to the rotation speed setting unit 8 and the speed setting unit 12 of the rotation speed adjusting unit 5.

Next, the operation of the above-configured device will be described. Prior to the driving of the machine base, speed change data of the spindle rotation speed corresponding to the spinning conditions is input to the speed setting unit 12 by the input device 13. When the machine base is driven, the inverter 11 outputs a frequency based on the speed command signal of the speed setting unit 12 and a voltage corresponding to the frequency to the spindle driving motor 2 via the variable resistor 6, and the spindle driving motor 2 Is driven to rotate the spindle 1. Since the spindle drive motor 2 is constituted by an induction motor,
Even if the same frequency and voltage are supplied to each spindle driving motor 2, a difference in the rotational speed between the spindle driving motors 2 occurs due to a difference in load resistance such as mechanical resistance and thread tension of each weight, and The rotation speed varies within a certain range depending on each weight.

A voltage corresponding to the rotation speed of the spindle 1 is output from a rotation speed detection unit 3 provided for each weight to a comparison unit 9 of a rotation speed adjustment unit 5 provided for the spindle 1 and a rotation common to all weights. It is output to the number command unit 7. The rotation speed command unit 7 receives the output signal SG of each rotation speed detection unit 3 and
Are calculated, and the minimum rotation speed is obtained by comparing the spindle rotation speed of each weight. Then, the rotation speed is output to the rotation speed setting unit 8 and the speed setting unit 12 as target rotation speed data. Rotation speed adjustment unit 5 for each weight
Outputs a voltage signal corresponding to the target rotation speed data from the rotation speed setting device 8 to the comparing portion 9, and the comparing portion 9 compares the output signals from the rotation speed setting device 8 and the rotation speed detecting portion 3. The output voltage to the spindle drive motor 2 is reduced by adjusting the resistance value of the variable resistor 6 until the difference disappears. As a result, the rotation speed of the spindle drive motor 2 decreases, the rotation speed of the spindle 1 is adjusted to the same as the target rotation speed data, and the rotation speeds of all the spindles 1 become the same.

Since the variation of the spindle speed in the state where the spindle speed is not adjusted by the speed adjusting unit 5 is not so large, the speed adjusting unit 5
The adjustment of the spindle rotation speed by is completed in a short time. After the speed setting unit 12 completes the adjustment of the spindle rotation speed,
The target rotational speed data output from the rotational speed command unit 7 is compared with a preset spindle rotational speed to obtain a difference between the target rotational speed data and the inverter 11 in order to increase the rotational speed of the spindle drive motor 2 by the difference. Change the command frequency and voltage. Thereby, the rotation speeds of all the spindles are adjusted to the predetermined rotation speed set by the input device 13. That is, when all spindle drive motors 2 cannot be driven at the same rotation speed at the same frequency and voltage due to the difference in load resistance of each weight, the input voltage to the spindle drive motor 2 is increased only at the weight having a difference from the target rotation speed. After the change is made and all the spindles have the same rotational speed, the frequency and voltage are changed under the same conditions by the inverter 11, so that all the spindle driving motors 2 can be easily driven at the predetermined rotational speed. Therefore,
There is no variation in the twist of the yarn between the weights.

The present invention is not limited to the above embodiment. For example, a transformer having a plurality of secondary taps may be used as the transformer of the rotational speed adjusting unit 5 instead of the variable resistor 6. The desired voltage may be obtained by changing the connection tap. In this case, unlike the above-described embodiment, the rotation speed command unit 7 calculates and compares the spindle rotation speed of each weight, and then outputs the target rotation speed data to the rotation speed setting unit 8 and the speed setting unit 12 when the target rotation speed data is output. Instead of selecting the minimum rotation speed among the spindle rotation speeds, the maximum rotation speed or an arbitrary rotation speed between both can be selected.
Further, another rotation sensor may be used instead of the tacho generator as the rotation speed detecting unit, or a plurality of inverters 11 may be provided when the number of weights is large.

[0015]

As described above in detail, according to the present invention, the spindles driven by independent drive motors for each weight can have the same rotation speed for all weights, and the product yarn The twist, which is an important quality, can be kept uniform with all weights,
Product quality is improved. Also, the cost is lower than when an inverter is provided for each weight.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Spindle, 2 ... Spindle drive motor, 3 ... Rotation speed detection unit, 5 ... Rotation speed adjustment unit, 6 ... Variable resistor as a transformer unit, 7 ... Rotation speed command unit, 8 ... Rotation speed setting unit, 9 …
Comparison section, 11: inverter, 12: speed setting section.

Claims (1)

(57) [Claims] 1. A spindle driving motor provided for each spindle, an inverter for driving the spindle driving motor at a variable speed, a speed setting unit for giving a speed command to the inverter, and a rotation provided for each spindle. A number detector, a transformer provided for each spindle and changing an output voltage to the spindle drive motor, and a comparator for comparing a signal from the rotation speed detector with a signal corresponding to a target rotation speed. A rotation speed adjustment unit that adjusts the output voltage of the transformer so that the spindle rotation speed becomes the target rotation speed, and a rotation speed command unit that outputs target rotation speed data to the rotation speed adjustment unit. Spindle drive of spinning machine.