JPH08158169A - Control of spindle-driving in spinning machine - Google Patents

Abstract

PURPOSE: To shorten the time of node occurrence, the time of unstable traveler attitude and prevent yarn breakage by gradually increasing the spindle rotation in the speed-increasing region and decreasing the rotation, when a ring plate comes down in the speed-decreasing region. CONSTITUTION: In the drive control of spindles in a ring spinning machine or a ring twisting machine, a central processing frame (CPU) 13 equipped with a program memory 14 and an operation memory 15 actuates according to the controlling program. The term from the start of yarn-winding to the full bobbin is divided into plural periods so that spindle speed may be changed in several steps. In the speed-increasing period, speed command signals are sent to an inventor 12 corresponding to the output of a spinning length detector 17 to gradually increase the spindle speed at such a speed gradient that it may not become zero between vicinal speed-changing points. In the speed-reducing period from the maximum rotation speed to the frame stopping, chase cycle is detected by a rotation position signal of a heart cum 24 inputted from a detector 28 of the rotation position of the heart cum, and a speed-reducing signal of the spindle is outputted to the inventor 12 at the timing when a ring plate turns descending in 1 chase cycle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle drive control method for a spinning machine such as a ring spinning machine and a ring twisting machine.

[0002]

2. Description of the Related Art A so-called stepless gear shift, which is devised to avoid a sudden change in spindle rotation in a speed-up section from start to maximum rotation, instead of a stepwise gear shift which is generally used in the past As a spindle drive control device for a spinning machine that performs the above, there is one disclosed in Japanese Patent Application Laid-Open No. 3-124819. With this control device, the set values of the production output and the spindle rotation speed are input at multiple shift points provided from the start of the spindle to the machine stop, and the speed between the adjacent shift points is input based on these set values. The gradient was calculated and the speed gradient of this spindle rotation speed was obtained. Further, as a similar purpose, JP-A-6-
Japanese Patent No. 65817 discloses a method of setting a speed gradient in a speed section obtained by dividing an acceleration / deceleration section from the start of the spindle to stopping the machine base, and controlling the spindle rotation speed according to the speed gradient.

[0003]

In the deceleration section from the maximum rotation speed to the stop, it is generally known that a node is likely to occur, and in particular, in the stepless transmission system as described in the above-mentioned prior art. However, even in the deceleration section, since the spindle is decelerated over time according to the speed gradient between the shift points according to the production amount, the time in which the node is generated becomes long, and the attitude of the traveler is always maintained throughout the deceleration section. However, there is a problem that the yarn is not stable and frequently breaks.

The problem to be solved by the present invention is to reduce the time during which the node is generated, stabilize the posture of the traveler, and prevent yarn breakage by gradually decelerating the spindle rotation speed. It is to provide a drive control method.

[0005]

In order to solve the above-mentioned problems, when the spindle rotational speed is changed at the shift point according to the production amount in the speed-up section from the start of the spindle until the maximum rotational speed is reached, the speed is increased. It is characterized in that the speed between adjacent shift points in a section is increased with a speed gradient that does not become zero, and in the deceleration section from the maximum rotation speed to the machine stop, the spindle rotation speed is gradually reduced. Further, in the deceleration section from the maximum rotation speed to the stop of the machine base, it is desirable that the spindle rotation speed is decelerated in the descending stroke when the ring plate is raised and lowered in one chase cycle.

[0006]

In the spindle drive control method of the present invention, the rotational speed is gradually reduced (step speed change) in the deceleration section from the maximum rotational speed of the spindle to the machine stop.
The deceleration time is shorter than the one in which the spindle speed is decelerated according to the speed gradient between the shift points, so that the node generation time can be shortened, and therefore the traveler's posture is stabilized and the possibility of yarn breakage is reduced. In the deceleration section,
By decelerating the spindle rotation speed in the lowering process of the ring plate in one chase cycle, tension is applied to the yarn and the occurrence of nodes is prevented, so that the problem of yarn breakage can be more effectively solved. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a spindle drive control method for a spinning machine according to the present invention will be described with reference to the drawings. In FIG. 1, a large number of spindles 1 are arranged on a machine base at equal pitches, and a spun yarn 4 fed from a front roller 3 is wound around a bobbin 2 inserted into the spindle 1. FIG. 1 shows the spun yarn 4 fully wound around a bobbin 2. A shaft 6 is connected to a drive motor 5 for driving the spindle, a spindle driving belt 10 is connected to the shaft 6, and the spindle 1 is rotationally driven via the spindle driving belt 10. . The drive motor 5 is driven and controlled by an inverter 12, and the inverter 12 controls the controller 1
The speed command output signal No. 1 is input via the input / output interface 18 and the digital-analog converter 19. Further, the drive motor 5 is also adapted to rotationally drive the draft section including the front roller 3 through another transmission mechanism. The ring plate 7 is provided with a traveler 29, and the ring plate 7 is connected to the lifting pillar 8, the lower end of the lifting pillar 8 is connected to one end of the lifting tape 9, and the other end of the lifting tape 9 is the lifting lever 20. It is fixed to the lifting drum 22 via a guide roller 21 which is rotatable in the middle. Lifting drum 22
A well-known shaper feeding mechanism 27 that transmits the swing of the lifting lever 20 to the lifting drum 22 via a gear pair 26 is connected to the. Lifting lever 20
Is swingably supported around a pivot 23, and its tip is pressed against the heart cam 24. Heart cam 24 is gear pair 2
5, the ring plate 7 is connected to the motor 5 for moving up and down in a constant chase cycle, and the heart cam 24 detects the rotating position of the heart cam in order to detect the vertical position of the ring plate 7. Heart cam rotation position detection device 28 that outputs a pulse according to the rotation position
Are connected. The ring plate 7 is a heart cam 24.
Due to the rotation, the so-called chase is performed in which the engagement position with respect to the lifting lever 20 is raised when it is rotated from the valley to the mountain and is lowered when it is rotated from the mountain to the valley. Further, in one chase cycle, when the ring plate 7 descends, the lifting drum 22 winds up the lifting tape 9 by the action of the shaper feeding mechanism 27, and the shaper is fed up every time the ring plate 7 completes one chase cycle.

The control unit 11 is a central processing unit 13 (CP
U) and read-only memory that stores control programs, etc.
(ROM) program memory 14 and central processing unit
From the calculation processing result in the storage 13 and the input means 16 described later.
Initial spindle speed input, speed gradient, full pipe
Stores the spinning length and the rotation position of the heart cam 24, which will be described later.
Readable and rewritable memory (RAM)
And an operation memory 15 (storage means). Control equipment
A plurality of speed change sections (S₀
~ S₉), The deceleration section S₉Speed-up area excluding
Interval S₀~ S₃And high-speed driving section S_Four~ S₈Corresponding to
Distributing, that is, the start point and end point of each section as adjacent shift points
While setting the speed gradient to connect and the initial speed that indicates the beginning of winding
The rising end of the ring plate 7 which becomes the timing of deceleration start
The rotation position of the heart cam 24 corresponding to
Keyboard 1 as input means for inputting
6 is connected. In addition, the controller 11 has a front row
Spinning length detector that measures the spinning length by detecting the number of revolutions of rotor 3
17 and output signals from the heart cam rotational position detector 28
No. (ring rail up / down position signal) is an input / output interface
It is designed to be input via the space 18. Central processing
The device 13 operates according to the control program shown in FIG.
Keyboard 16 via input / output interface 18
Which is input by the user and stored in the operation memory 15
Initial speed of rotation, velocity gradient and this spinning length detector 17
From the output (spin length) input from the
The speed command signal corresponding to the corresponding spindle rotation speed.
Output to the inverter 12. Also in the center
The processing device 13 rotates the heart cam during deceleration of the spindle.
Rotation of the heart cam 24 input from the position detection device 28
The chase cycle is detected by the position signal and the chase
The tie ring plate 7 of the icle turns from rising to falling
Input a deceleration signal to reduce the spindle rotation speed.
It is designed to output to the barter 12. Inverter 1
2, the deceleration gradient is set in advance, and the deceleration section S ₉smell
When the deceleration signal is input,
Therefore, the drive motor 5 is decelerated. This slowdown
The gradient is set to a value that stops 20,000 rpm in 20 seconds.
Defined, speed-up section S₀~ S₃Compared to the velocity gradient at
It has a steep slope.

Next, the operation of the spindle drive control method for the spinning machine of the present embodiment constructed as described above will be described with reference to FIGS. 2 and 3. Generally, the rise time until the drive motor 5 reaches the normal operating speed rises in a few seconds according to a pre-established speed increasing gradient, and the time until the spindle rotation is stopped after the pipe is fully filled is also the pre-determined decelerating gradient (same as above). These values have little influence on the production amount, and it can be considered that the spindle rotation immediately reaches the below-described initial speed N ₀ after the start-up. Therefore, according to the present application, the worker has 70% to 8% of the maximum speed prior to driving.
The initial speed N ₀ of the spindle rotation speed of about 0% is determined and input, and the shift section S ₀ to
Divide into S ₉ . Then, the speed gradients V _{0 to} V ₈ are input from the keyboard 16 corresponding to the respective shift sections S _{0 to} S ₈ so that the rotation speed of the spindle becomes a predetermined shift pattern according to the predetermined spinning condition, Are stored in the operation memory 15 (step P1). The speed gradient V _{0 to} V _{8 mentioned} here is the difference between the initial speed and the final speed of each of the divided sections S _{0 to} S ₈ , and in this embodiment, the speed increase per 10% of the production amount is shown. In the speed-up section S _{0 to} S ₃ , the speed gradient is set to a nonzero value. The deceleration section S _{9 is} also divided into two equal parts.

Next, the machine base is started in this state, the spindle rotation speed immediately reaches the initial speed N ₀ , and the start is confirmed (step P2). At the same time, the rotation speed of the front roller 3 is centrally processed from the spinning length detector 17. The accumulation is started in the device 13, and the chase cycle is monitored from the pulse of the heart cam rotational position detecting device 28. Then, it is judged which section is in the present integrated value, that is, the production amount from the start of winding to the present (step P3), and it is not a full pipe (step P).
4) If it is not in the deceleration section S ₉ (step P5), the spindle rotation speed N at the spinning length X is calculated from the following equation every time the production amount, the speed gradient, and the unit length (for example, 2 m) increase from the initial speed. Spindle rotation speed N = Nn + Vn × (X-10 · n)
/ 10 (n = 0 to 8) However, Nn represents the initial speed of each section, and Nn = N ₀ (section S ₀ ).

[Equation 1] The spinning length X is expressed as a percentage. Then, a speed command is output to the inverter 12 so as to attain the determined spindle rotation speed N, and the inverter 12 controls the shift of the drive motor 5 accordingly (step P6). As a result, the spindle rotation speed is finely increased for each unit length of the spinning length and changes almost linearly. By repeating this control, the deceleration spinning length is 90
When it becomes% and enters the section S ₉ (step P5), it is judged whether or not the deceleration command is issued in the first deceleration section (S ₉₁ ) (step P7), and the timing at which the chase cycle starts falling is detected by the heart cam rotational position. Judgment is made based on whether or not the number of pulses from the device 28 has reached a preset rotational position (step P8), and a deceleration command is output to the inverter 12, so that the inverter 12 has a deceleration gradient set in advance. The drive motor 5 is decelerated for a fixed time (here, 2 seconds) to reduce the rotation speed of 2000 rpm (step P9). Then, when it becomes the step P7 again, the first deceleration section (S ₉₁ ).
Since the deceleration command is issued in, the second deceleration section (S ₉₂ )
Is determined (step P10), it is then determined whether a deceleration command has been issued (step P11), and if the chase cycle has started to fall (step P8), a deceleration command is issued and the rotational speed of 2000 rpm is further reduced ( Step P
9). In this way, the deceleration in the deceleration section S ₉ is performed in a stepwise manner having a portion that is decelerated substantially horizontally with the spindle rotation speed axis in FIG. 2 and a portion that has a constant spindle rotation speed. Eventually, it will be determined in step P4 that the pipe will become full, and the drive motor
Is stopped at the preset deceleration gradient.

In the deceleration section, the spindle rotational speed is decelerated for a few seconds during the descent of the chase cycle. In other cases, the spindle rotational speed is constant and the tension applied to the yarn is constant, so that the ballooning is stable. However, the posture of the traveler is stable.

The present invention is not limited to the above-described embodiment. For example, in the speed-up section, the data of the spindle rotation speed and the production amount at each gear shift point are input, and the adjacent gear shifts are performed based on these set values. Even if the speed gradient between the points is calculated from the difference in the rotation speed and the difference in the production amount and stored in the memory, and then the spindle rotation speed is shift-controlled so that the speed gradient stored in the memory is obtained. Good. Also,
In the deceleration section, the rotational speed is decelerated in the descending region of the chase cycle, but deceleration of the spindle rotational speed does not have to be in the descending region of the chase cycle. In this case, the ring plate may be rapidly lowered simultaneously with deceleration.

[0013]

As described above, according to the present invention, the spindle rotation speed is gradually increased in the speed-up section to be increased to a predetermined rotation speed, so that the occurrence of yarn breakage due to a gear shift can be prevented, and the machine speed from the maximum rotation speed can be prevented. In the deceleration section up to the stop, the spindle rotation speed is decelerated in stages, so that the node generation during deceleration and the period during which the posture of the traveler is unstable are very short, so that yarn breakage is less likely to occur. Further, by performing deceleration when the ring plate descends, it is possible to apply tension to the yarn, prevent the occurrence of nodes due to loosening of the yarn, and eliminate the yarn breakage.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of the present invention.

FIG. 2 is a diagram showing a shift pattern of a spindle rotation speed.

FIG. 3 is a control program.

FIG. 4 is a chart showing a velocity gradient with respect to a section.

FIG. 5 is an explanatory diagram of the relationship between the lifting and lowering of the ring plate and the spindle rotation speed (IV part enlarged view).

[Explanation of symbols]

1 spindle 4 spun yarn, 5 drive motor, 7
Ring plate, 11 control device, 12 inverter, 24 heart cam, 28 heart cam rotation position detection device, 29 traveler, Nd deceleration rotation speed

Claims (2)

[Claims] 1. When shifting the spindle rotational speed at a shift point in accordance with the production amount in the speed-up section from the start-up of the spindle to reaching the maximum rotation speed, zero is not provided between adjacent shift points in the speed-up section. A spindle drive control method for a spinning machine, characterized by increasing the speed with a speed gradient and gradually reducing the spindle speed in a deceleration section from the maximum rotation speed to the machine stop. 2. The deceleration of the spindle rotation speed during deceleration from the maximum rotation speed to the stop of the machine base is performed in the descending stroke when the ring plate is lifted and lowered in one chase cycle. A spindle drive control method for a spinning machine according to claim 1.