JPH0325524B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a drive device for a spinning machine such as a spinning machine or a yarn twisting machine, and in particular to a drive device that can change the spindle rotation speed over a wide range. It is related to the device.

(Prior art) In general, in this type of spinning machine, after starting the rotation speed of the spindle, the spindle is rotated at a low speed until it reaches about a half heap of yarn, then shifts to a constant high speed rotation, and continues to rotate at high speed until the tube is full. There is also a method of operating the machine, then shifting to low-speed rotation and then stopping the machine, or a method of operating the machine, as shown in FIG. 3, in which the machine is rotated at an intermediate rotation speed during the transition from low-speed rotation to high-speed rotation. Conventionally, as a method of changing the speed of the spindle at regular intervals, that is, each time the amount of bobbin windings changes, the spindle drive motor and spindle drive shaft are equipped with stepped pulleys, and the belt is moved by a belt shifter. A device was used to change gears. However, in a spinning machine, it is necessary to change the number of revolutions of the spindle in accordance with changes in spinning conditions such as the type of fiber, yarn count, ring diameter, etc. For example, even if the spun yarn count is the same, it is 100% cotton.
Compared to the cotton/polyester blend yarn, the latter has stronger yarn strength and can be rotated at high speed. In addition, when spinning the same fiber, it is possible to spin at the highest speed around 40 counts, and with fine counts (over 60 counts), the yarn strength becomes weak and it cannot be spun at very high speeds; In the case of a thick yarn count (count 20 or less), the yarn strength is strong, but the frictional resistance of the traveler increases and the tension on the yarn increases, which causes fuzzing of the yarn, making high-speed rotation undesirable. In this way, in order to operate at the optimum spindle rotation speed as the spinning conditions change, in the speed change method using stepped pulleys, a large number of stepped pulleys with different pulley diameters are prepared. It is necessary to replace the stepped pulley. However,
It takes a lot of effort to remove and replace the stepped pulley, and especially in a spinning machine equipped with a tube changing device for all spindles at the same time, a drive mechanism for driving the tube changing device is installed in parallel with the drive motor. This made it difficult to perform the work and required the machine to be shut down for nearly half a day to replace the pulleys, resulting in a significant drop in machine operating efficiency.

In order to solve this problem, as shown in FIG.
A method has been proposed in which the drive shaft 31 is driven via a belt 35 and the drive motor 32 is driven via a frequency variable inverter. When driving a motor using an inverter, the efficiency deteriorates rapidly at frequencies below 40 Hz, as shown in Figure 6, so the variable frequency range must be between 40 and 60 Hz. be. On the other hand, in recent spinning machines, the rate of change in spindle rotational speed between maximum speed operation and low speed operation is approximately 10%, which is sufficiently covered by changing the frequency between 40 and 60 hertz. be able to.

However, in recent years, spinning factories have tended to produce a wide variety of spun yarns over a wide range of products.
As a result, the rotational speed of the spindle must be changed significantly, and in order to cope with this by changing the frequency,
There are often cases where spindle rotational speeds that must be operated below 40 Hz are required. However, as mentioned above, when the motor is operated at a frequency of 40 hertz or less, the amount of power loss increases and the efficiency deteriorates rapidly, so this is usually dealt with by replacing the pulley. However,
As mentioned above, replacing the pulleys requires a great deal of effort and is disadvantageous in that it leads to a decrease in machine operating efficiency.

(Problems to be Solved by the Invention) This invention requires a great deal of work to replace the pulleys when the rotational speed of the spindle is significantly changed due to changes in spinning conditions, and it also takes a long time to stop the operation of the machine. This solves the problem that the operating efficiency of a long-drawn machine is reduced.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a method for exciting a spindle drive motor from the start of operation to the stop of the machine in spinning machines such as spinning machines and yarn twisting machines. In addition, a variable frequency inverter is provided to command the spindle drive motor to change speed within a range of 40 to 60 hertz as the amount of bobbins wound on the tube changes, and the spindle drive shaft is driven via a belt. A configuration is adopted in which the motor shaft of the drive motor is equipped with a stepped pulley for changing the belt position by changing spinning conditions such as spinning count.

(Function) In this invention, the rate of change in rotation speed is approximately 10%.
Changing the rotation speed between low-speed rotation for a certain period of time from the start of machine operation and subsequent high-speed rotation is done by setting the output frequency of the inverter to a predetermined value. Changes in the rotational speed due to major changes such as the above are made by changing the hanging position of the belt hanging on the stepped pulley.

(Example) Examples 1 to 3 which embody this invention will be described below.
This will be explained according to the diagram. A spindle drive motor 2 is disposed below one end of a spindle drive shaft 1 extending in the longitudinal direction of the machine so that its motor shaft 2a extends parallel to the spindle drive shaft 1. The drive motor 2 has elongated holes 3a extending in a direction perpendicular to the motor shaft 2a at the four corners of its support leg portion 3, and is fixed onto a support base 5 by bolts 4 inserted through the elongated holes 3a. A support bracket 6 is fixed on the support base 5 near the fixed position of the drive motor 2, and the support bracket 6
is equipped with an adjusting bolt 7 that abuts against the support leg 3 of the drive motor 2 from a direction perpendicular to the motor shaft 2a. Stepped pulleys 8 and 9 are fitted onto the spindle drive shaft 1 and the motor shaft 2a of the drive motor 2, respectively, and a flat belt 10 is hung between both pulleys 8 and 9.

The drive motor 2 is driven via a variable frequency inverter (not shown).
Further, the variable frequency inverter is configured so that its output frequency is changed by a command from a control device that controls the drive motor 2 according to the operating program shown in FIG.

Next, the operation of the apparatus configured as described above will be explained. The rotation speed of the spindle is rotated at a low speed (1st speed) from the start of machine operation until about the half-cycle, then increases to a medium speed (2nd speed), and then increases to the maximum speed (3rd speed). After the speed rises, the drive motor 2 is operated at the maximum speed until the pipe is full, and after the speed is reduced to the second speed, the excitation of the drive motor 2 is released and the drive motor 2 comes to a stop due to inertia rotation. In this device, switching between low speed, medium speed, and high speed is performed by setting and adjusting the output frequency of the inverter. That is, before starting machine operation, each of the above-mentioned low speed, medium speed,
Set the value of each variable resistor of the inverter to output the frequency corresponding to the highest speed. If you start operating the machine in this state, the drive motor 2 will be driven via the inverter based on the control signal from the control circuit, and the spindle will change the rotation speed optimal for the spinning conditions shown in Figure 3. However, spinning continues. Since the rate of change in the output frequency from the inverter between the low speed and the maximum speed is approximately within 10%, the output frequency from the inverter can be set within a frequency range with high power usage efficiency.

When significantly changing the spinning conditions such as the type of spun fiber, yarn count, ring diameter, etc., change the hanging position of the flat belt 10 on the stepped pulleys 8 and 9, and adjust the output of the inverter as necessary. Set the frequency. In other words, when changing the operating program shown by the solid line to the operating program shown by the chain line in Fig. 3, or vice versa, when the spindle rotational speed needs to be changed significantly, it is not enough to change the inverter output frequency setting alone. As the frequency range exceeds 40 to 60 hertz, power usage efficiency deteriorates.
The number of rotations from the motor shaft 2a to the spindle drive shaft 1 can be changed by changing the hanging position of the flat belt 10, which is hung around the stepped pulleys 8 and 9 fitted to the spindle drive shaft 1 and the motor shaft 2a. The transmission ratio has been significantly changed to accommodate this.

When changing the hanging position of the flat belt 10,
Loosen the bolts 4 fixing the support legs 3 of the drive motor 2. In this state, the drive motor 2 is movable on the support base 5 along the elongated hole 3a. Next, rotate the adjuster bolt 7 and attach the support bracket 6.
By reducing the amount of protrusion of the tip from the elongated hole 3, the drive motor 2 is driven by the tension of the flat belt 10.
a in the direction of arrow A in FIG. Next, the flat belt 10 is manually moved to the predetermined positions of the stepped pulleys 8 and 9. At this time, the flat belt 10
Since there is no tension acting on it, it can be easily moved. Next, the adjustment bolt 7 is rotated in the opposite direction to that described above, the drive motor 2 is slid to a position where the tension of the flat belt 10 is optimal, and finally the bolt 4 is tightened to complete the work. In this way, the work of replacing the flat belt 10 can be completed by simply loosening and tightening the bolts 4 and adjuster bolts 7, and can be completed in a short time, thereby reducing the time during which the machine is stopped. Can be done.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, the number of stages of the stepped pulleys 8 and 9 may be set to 3.
Alternatively, the flat belt 10 may be moved automatically by providing a belt shifter 11 as shown in FIG. 4. Further, from the start of operation to high-speed operation, two-stage shifting of low speed and high speed may be used.

Effects of the Invention As detailed above, according to the present invention, it is possible to drive the spindle drive motor from the start of operation to the stop of the spinning frame frame only by frequency control from an inverter, and Changes in the spindle rotation speed due to changes in the amount of bobbins wound inside the tube can be set within a range that maximizes the power usage efficiency of the inverter, making it possible to make large changes in the type of spun fiber, yarn count, ring diameter, etc. If it is necessary to change the spindle rotation speed, this can be done by changing the hanging position of the flat belt hanging on the stepped pulley. In addition to reducing costs, there is no need to remove or replace pulleys, which requires a lot of work and significantly prolongs machine stoppage time, which reduces machine stoppage time due to changes in spinning conditions. It can be done in an extremely short time, and can improve the operating efficiency of the machine even when performing high-mix, small-lot production.Moreover, it is possible to change spinning conditions over a wide range while maintaining high power usage efficiency. It has an excellent effect.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment embodying the present invention; Figure 1 is a front view, Figure 2 is a partially cutaway side view, and Figure 3 is a line showing changes in spindle rotation speed. 4 is a front view showing a modified example, FIG. 5 is a front view showing a conventional device, and FIG. 6 is a diagram showing changes in efficiency with respect to frequency when a motor is driven by an inverter. Spindle drive shaft...1, Drive motor...
2. Stepped pulley...8,9, Flat belt...10.

Claims (1)

[Claims] In spinning machines such as spinning machines and yarn twisting machines, the spindle drive motor is excited from the time the machine starts operating until it is stopped, and as the amount of bobbins wound on the tube changes, the spindle drive motor is energized at 40 to 60 Hz. A variable frequency inverter is provided to command the speed change within the range of A drive device for a spinning machine characterized by being equipped with a stepped pulley for changing the speed.