JP2000327221A - Rotating speed control device and frequency control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating speed control device and a frequency control device capable of automatically and gradually changing central frequency and preventing occurrence of twill dropping. SOLUTION: Means S14, S16 to change rotating speed of a bobbin high and low by a periodic specified pattern to uniformly take up yarn on the bobbin and a mean S8 to gradually change central rotating speed each time when the pattern is repeated until the central rotating speed after changing to be a target are furnished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production line for spinning synthetic fibers and the like.
The present invention relates to a rotation speed control device that raises and lowers the rotation speed of a bobbin in a predetermined periodic pattern, and a frequency control device that raises and lowers the output frequency of an inverter that drives a motor that rotates the bobbin in a predetermined periodic pattern. .

[0002]

2. Description of the Related Art In an inverter that drives a motor that rotates a bobbin that winds a yarn in a spinning production line of synthetic fibers or the like, a frequency is periodically changed in order to make the winding thickness of the bobbin uniform. A function to change the value is required. This is because the rotation speed of the motor that rotates the bobbin is not made constant, but, for example, as shown in FIG. This is a function for preventing the twill drop (a state in which the yarns are overlapped and collapsed) generated at the turning point of the increase / decrease of the rotation speed.

As shown in FIG. 8, for example, a periodic predetermined pattern (modulation pattern) of an output frequency of an inverter for driving a motor (∝motor rotation speed) is represented by frequency f on the vertical axis and time t on the horizontal axis. The center frequency f _D , the amplitude upper limit f ₁ , the amplitude lower limit f ₂ , the correction value 1f ₃ when the amplitude is reversed, the correction value 2f ₄ when the amplitude is inverted, the acceleration time t ₂ during the pattern operation, and the pattern operation The time is determined by the deceleration time t ₁ .

[0004]

If the center frequency of the modulation pattern is changed while the bobbin is being wound, the acceleration / deceleration time required to reach the changed center frequency (target center frequency) is a normal value. In some cases, a twill drop occurs due to a longer pattern than the modulation pattern or a change in the acceleration / deceleration rate. The occurrence of this bleeding is more likely to occur as the change amount of the center frequency is larger. Therefore, in the conventional rotation speed control device and frequency control device, when changing the center frequency of the modulation pattern, the operator has to manually gradually change the center frequency.

[0005] As a technique relating to a rotational speed control device and a frequency control device related to a bobbin, Japanese Patent Application Laid-Open No. 58-11 / 1983
Japanese Patent Application Laid-Open No. 9774/1997 discloses a “method of controlling a variable frequency inverter”, and Japanese Patent Application Laid-Open No. 58-31863 discloses a “traverse control device for a spinning machine”. The present invention has been made in view of the above-described circumstances, and when the center frequency is changed, the center frequency can be automatically changed stepwise without depending on the operation of the operator, and It is an object of the present invention to provide a rotation speed control device and a frequency control device capable of preventing occurrence.

[0006]

According to a first aspect of the present invention, there is provided a rotation speed control device for changing the rotation speed of the bobbin to a high or low value according to a predetermined periodic pattern so as to uniformly wind the yarn on the bobbin. Means for changing, and when changing the center rotation speed of the change, up to the target changed center rotation speed,
Means for changing the center rotational speed stepwise each time the pattern is repeated.

A rotation speed control device according to a second aspect of the present invention includes means for changing the rotation speed of the bobbin to a high or low level in a predetermined periodic pattern so that the yarn is uniformly wound around the bobbin. Means for changing the center rotation speed stepwise to a predetermined rotation speed every time the pattern is repeated until the target changed center rotation speed when changing the center rotation speed I do.

A rotation speed control device according to a third aspect of the present invention includes means for changing the rotation speed of the bobbin to a high and low level in a predetermined periodic pattern so that the yarn is uniformly wound around the bobbin. Means for changing the center rotation speed stepwise each time the pattern is repeated by a predetermined number of times up to a target changed center rotation speed when the center rotation speed is changed. .

A frequency control device according to a fourth aspect of the present invention is to adjust the output frequency of an inverter that drives a motor for rotating the bobbin to a high or low level by a predetermined periodic pattern so that the yarn is uniformly wound around the bobbin. Means for changing, and when changing the center frequency of the change, means for changing the center frequency stepwise each time the pattern is repeated up to the target changed center frequency. .

The frequency control device according to a fifth aspect of the present invention is to adjust the output frequency of an inverter that drives a motor that rotates the bobbin to a high or low level by a predetermined periodic pattern so that the yarn is uniformly wound around the bobbin. Means for changing, and when changing the center frequency of the change, means for changing the center frequency stepwise to a predetermined frequency each time the pattern is repeated up to the target changed center frequency. It is characterized by.

A frequency control device according to a sixth aspect of the present invention provides a frequency control device that raises or lowers the output frequency of an inverter that drives a motor that rotates the bobbin in a predetermined periodic pattern so that the yarn is uniformly wound around the bobbin. Means for changing, and when changing the center frequency of the change, means for changing the center frequency stepwise each time the pattern is repeated by a predetermined number of times up to a target changed center frequency. It is characterized by.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment. Embodiment 1 FIG. FIG. 1 is a block diagram illustrating a configuration of a rotation speed control device and a frequency control device according to a first embodiment of the present invention. The rotation speed control device and the frequency control device include a CPU 8, a ROM 7, a RAM 6, an I / O port 2, a bus 9 interconnecting the CPU 8, the ROM 7, the RAM 6, and the I / O port 2, and an I / O port. A setting device 1 connected to the port 2 for setting a periodic pattern of the output frequency (∽motor rotation speed) of the inverter 3 driving the motor 4 for rotating the bobbin 5; The inverter 3 is connected to the I / O port 2, and its output frequency is controlled by the CPU 8.

The periodic pattern (modulation pattern) of the output frequency of the inverter 3 set by the setting device 1 is, for example, as shown in FIG.
Assuming that the horizontal axis is time t, the center frequency f _D , the amplitude upper limit f ₁ , the amplitude lower limit f ₂ , the correction value 1f ₃ when the amplitude is inverted,
The correction value 2f ₄ at the time of reversing the swing width, the acceleration time t ₂ during the pattern operation, and the deceleration time t ₁ during the pattern operation are set.

Hereinafter, the operation of the rotation speed control device and the frequency control device having the above-described configuration will be described with reference to the flowchart of FIG. When the center frequency (the center set frequency) of the modulation pattern is changed by the setter 1 (S2), the CPU 8 turns on the center change flag 8a (S4).

Next, the CPU 8 determines whether or not the center change flag 8a is turned on (S6). When the center change flag 8a is turned on, the new center frequency = the old center frequency + the predetermined value. The frequency (step frequency) is calculated (S8), and it is determined whether the calculated new center frequency is equal to or higher than the changed center frequency (set frequency) (S1).
0). If the calculated new center frequency has not reached the changed center frequency, a modulation pattern having the calculated new center frequency as the center frequency is calculated (S1).
4) The output frequency of the inverter 3 is controlled by the calculated modulation pattern (S16), and it is determined whether the center change flag 8a is turned on (S6).

If the calculated new center frequency is equal to or greater than the changed center frequency (S10), the CPU 8 determines whether the new center frequency has been changed (S10).
The center change flag 8a is turned off (S12), the calculated (S8) modulation pattern with the new center frequency as the center frequency is calculated (S14), and the output frequency of the inverter 3 is controlled by the calculated modulation pattern (S16). Next, it is determined whether or not the center change flag 8a is turned on (S6).

The CPU 8 uses the setting device 1 to set the center frequency (the center set frequency) of the modulation pattern.
Is not changed (S2), or when the center change flag 8a is not turned on (S6), a modulation pattern having the center frequency set at that time as the center frequency is calculated (S14). The output frequency of the inverter 3 is controlled by the calculated modulation pattern (S16), and it is determined whether the center change flag 8a is turned on (S6).

By repeating the above operation, for example, the setting device 1 changes the center frequency of the modulation pattern from 30 Hz to 60 Hz, and calculates, and calculates the new center frequency = the old center frequency + the predetermined frequency (S8). If the frequency is set to 5 Hz, as shown in FIG. 3, the center frequency of the modulation pattern increases stepwise by 5 Hz for each modulation pattern, and the change of the center frequency is completed when the center frequency reaches 60 Hz. .

In the above-described embodiment, the case of changing the center frequency of the modulation pattern is described. However, the case of changing the center frequency of the modulation pattern is reduced is described in the flowchart of FIG. = New center frequency = Old center frequency-Predetermined frequency in place of calculation (S8) of old center frequency + predetermined frequency, and whether the calculated new center frequency is equal to or greater than the changed center frequency is determined. Instead of the determination (S10), it may be determined whether the calculated new center frequency is equal to or lower than the changed center frequency.

By repeating this operation, for example,
The center frequency of the modulation pattern is changed from 60 Hz to 30 Hz by the setting device 1, and the predetermined frequency of calculation, new center frequency = old center frequency−predetermined frequency, is 5 Hz.
As shown in FIG. 4, the center frequency of the modulation pattern gradually decreases by 5 Hz for each modulation pattern, and when the center frequency reaches 30 Hz, the change of the center frequency is completed. As described above, when the center frequency of the modulation pattern is changed, the center frequency can be automatically changed stepwise without depending on the operation of the operator, so that it is possible to prevent the occurrence of twill drop.

Embodiment 2 FIG. FIG. 5 is a flowchart showing the operation of the rotation speed control device and the frequency control device according to the second embodiment of the present invention. Hereinafter, the operation of the rotation speed control device and the frequency control device will be described based on this flowchart. The configuration of the second embodiment of the rotation speed control device and the frequency control device according to the present invention is the same as the configuration (FIG. 1) of the above-described first embodiment of the rotation speed control device and the frequency control device according to the present invention. Therefore, the description is omitted. When the setting device 1 changes the center frequency of the modulation pattern (set center frequency) (S22), the CPU 8 turns on the center change flag 8a (S24).

Next, the CPU 8 determines whether or not the center change flag 8a is turned on (S26). When the center change flag 8a is turned on, the step frequency = (new frequency-old frequency) (Set frequency) / set number of times is calculated (S28). Thereby, the step frequency to be changed per one time (one step) for completing the change of the center frequency of the modulation pattern is obtained by the set number of times (the predetermined number of times).

Next, the CPU 8 calculates the new center frequency = the old center frequency + the step frequency using the obtained step frequency (S30), and calculates the changed center frequency (the set center frequency). (Frequency) or more (S32). If the calculated new center frequency has not reached the changed center frequency, a modulation pattern having the calculated new center frequency as the center frequency is calculated (S36), and the output frequency of the inverter 3 is controlled by the calculated modulation pattern. (S3
8) Then, it is determined whether or not the center change flag 8a is turned on (S26).

If the calculated (S30) new center frequency is equal to or higher than the changed center frequency, the CPU 8 (S3).
2) The center change flag 8a is turned off (S34), the calculated (S30) modulation pattern with the new center frequency as the center frequency is calculated (S36), and the output frequency of the inverter 3 is controlled by the calculated modulation pattern (S36). S38). Next, it is determined whether or not the center change flag 8a is turned on (S26).

The CPU 8 uses the setting device 1 to set the center frequency (the center set frequency) of the modulation pattern.
Is not changed (S22), or when the center change flag 8a is not turned on (S26), a modulation pattern having the center frequency set at that time as the center frequency is calculated (S36). The output frequency of the inverter 3 is controlled by the calculated modulation pattern (S38), and it is determined whether the center change flag 8a is turned on (S26).

By repeating the above operation, for example, the center frequency of the modulation pattern is changed from 30 Hz to 60 Hz by the setting device 1, and the set number of times (predetermined number) to be changed stepwise is set to six times. If
As shown in FIG. 6, the center frequency of the modulation pattern increases stepwise (here, 5 Hz = to the step frequency) for each modulation pattern after passing through six modulation patterns, and the center frequency reaches 60 Hz. At this point, the change of the center frequency is completed.

In the above-described embodiment, the case of changing the center frequency of the modulation pattern is described. However, the case of changing the center frequency of the modulation pattern is reduced. Instead of determining whether the center frequency is higher than the changed center frequency (set frequency) (S32), it is determined whether the calculated new center frequency is lower than or equal to the changed center frequency. Good.

By repeating this operation, for example,
If the center frequency of the modulation pattern is changed from 60 Hz to 30 Hz by the setting device 1 and the set number of times (predetermined number) to be changed stepwise is set to 6, FIG.
As shown in (5), the center frequency of the modulation pattern decreases stepwise (here, 5 Hz = step frequency) for each modulation pattern after passing through six modulation patterns, and the center frequency becomes 3
When the frequency reaches 0 Hz, the change of the center frequency is completed.
As described above, when the center frequency of the modulation pattern is changed, the center frequency can be automatically changed stepwise without depending on the operation of the operator.

[0029]

In the rotation speed control device according to the first invention,
The means for changing the height changes the rotational speed of the bobbin in a predetermined periodic pattern so that the yarn is uniformly wound on the bobbin. When the center rotation speed of the change is changed, the stepwise changing means changes the center rotation speed stepwise each time the pattern is repeated until the target changed center rotation speed. This realizes a rotation speed control device that can automatically change the center rotation speed in a stepwise manner when the center rotation speed is changed, regardless of the operation of the operator, and can prevent the occurrence of twill drop. You can do it.

In the rotation speed control device according to the second aspect of the present invention, the means for changing the height changes the rotation speed of the bobbin in a predetermined periodic pattern so that the yarn is uniformly wound around the bobbin. Let it. When the center rotation speed of the change is changed, the means for changing the center rotation speed gradually increases the center rotation speed to a predetermined rotation speed every time the pattern is repeated until the target changed center rotation speed. Change. This realizes a rotation speed control device that can automatically change the center rotation speed in a stepwise manner when the center rotation speed is changed, regardless of the operation of the operator, and can prevent the occurrence of twill drop. You can do it.

In the rotation speed control device according to the third aspect of the invention, the means for changing the height of the bobbin changes the rotation speed of the bobbin to a high or low value according to a periodic predetermined pattern in order to uniformly wind the yarn on the bobbin. Let it. When the center rotation speed of the change is changed, the stepwise changing means changes the center rotation speed stepwise each time the pattern is repeated by a predetermined number of times until the target changed center rotation speed. Let it. This realizes a rotation speed control device that can automatically change the center rotation speed in a stepwise manner when the center rotation speed is changed, regardless of the operation of the operator, and can prevent the occurrence of twill drop. You can do it.

In the frequency control device according to the fourth aspect of the invention, the means for changing the height changes the output frequency of the inverter that drives the motor that rotates the bobbin in a periodic manner so that the yarn is uniformly wound around the bobbin. Is changed to high or low by the above pattern. When changing the center frequency of the change, the stepwise changing means changes the center frequency stepwise each time the pattern is repeated up to the target changed center frequency. Thus, when the center frequency is changed, the center frequency can be automatically changed in a stepwise manner regardless of the operation of the operator, and a frequency control device capable of preventing occurrence of crosstalk can be realized. I can do it.

In the frequency control device according to the fifth aspect of the invention, the means for changing the height changes the output frequency of the inverter that drives the motor that rotates the bobbin in a predetermined period so that the yarn is uniformly wound around the bobbin. Is changed to high or low by the above pattern. When changing the center frequency of the change, the stepwise changing means changes the center frequency stepwise to a predetermined frequency each time the pattern is repeated up to the target changed center frequency. Thus, when the center frequency is changed, the center frequency can be automatically changed in a stepwise manner regardless of the operation of the operator, and a frequency control device capable of preventing occurrence of crosstalk can be realized. I can do it.

In the frequency control device according to the sixth aspect of the invention, the means for changing the height changes the output frequency of the inverter that drives the motor that rotates the bobbin in a predetermined cycle so that the yarn is uniformly wound around the bobbin. Is changed to high or low by the above pattern. When the center frequency of the change is changed, the stepwise changing means changes the center frequency stepwise each time the pattern is repeated a predetermined number of times up to the target changed center frequency. Thus, when the center frequency is changed, the center frequency can be automatically changed in a stepwise manner regardless of the operation of the operator, and a frequency control device capable of preventing occurrence of crosstalk can be realized. I can do it.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a rotation speed control device and a frequency control device according to the present invention.

FIG. 2 is a flowchart illustrating operations of a rotation speed control device and a frequency control device according to the present invention.

FIG. 3 is an explanatory diagram for explaining operations of a rotation speed control device and a frequency control device according to the present invention.

FIG. 4 is an explanatory diagram for explaining operations of a rotation speed control device and a frequency control device according to the present invention.

FIG. 5 is a flowchart showing operations of a rotation speed control device and a frequency control device according to the present invention.

FIG. 6 is an explanatory diagram for explaining operations of a rotation speed control device and a frequency control device according to the present invention.

FIG. 7 is an explanatory diagram for explaining operations of a rotation speed control device and a frequency control device according to the present invention.

FIG. 8 is an explanatory diagram for explaining operations of a rotation speed control device and a frequency control device.

[Explanation of symbols]

1 Setter, 3 inverters, 4 motors, 5 bobbins, 8 CPUs.

Claims (6)

[Claims] 1. In order to uniformly wind the yarn on a bobbin,
Means for changing the rotation speed of the bobbin to a high or low level by a periodic predetermined pattern, and when changing the center rotation speed of the change, up to a target changed center rotation speed,
Means for changing the center rotation speed stepwise each time the pattern is repeated. 2. In order to uniformly wind the yarn on a bobbin,
Means for changing the rotation speed of the bobbin to a high or low level by a periodic predetermined pattern, and when changing the center rotation speed of the change, up to a target changed center rotation speed,
Means for stepwise changing the center rotation speed to a predetermined rotation speed each time the pattern is repeated. 3. In order to uniformly wind the yarn on a bobbin,
Means for changing the rotation speed of the bobbin to a high or low level by a periodic predetermined pattern, and when changing the center rotation speed of the change, up to a target changed center rotation speed,
Means for changing the center rotational speed stepwise each time the pattern is repeated a predetermined number of times. 4. In order to uniformly wind the yarn on a bobbin,
Means for changing the output frequency of the inverter that drives the motor that rotates the bobbin to a high or low level by a periodic predetermined pattern, and when changing the center frequency of the change, up to the target changed center frequency. Means for changing the center frequency stepwise each time the pattern is repeated. 5. In order to uniformly wind the yarn on a bobbin,
Means for changing the output frequency of the inverter that drives the motor that rotates the bobbin to a high or low level by a periodic predetermined pattern, and when changing the center frequency of the change, up to the target changed center frequency. Means for gradually changing the center frequency to a predetermined frequency each time the pattern is repeated. 6. In order to uniformly wind the yarn on a bobbin,
Means for changing the output frequency of the inverter that drives the motor that rotates the bobbin to a high or low level by a periodic predetermined pattern, and when changing the center frequency of the change, up to the target changed center frequency. Means for changing the center frequency stepwise each time the pattern is repeated a predetermined number of times.