JPS6218469B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a constant speed winding device in which the rotation of an electric motor connected to a winding shaft is controlled by an inverter.

The speed of a winding machine for winding synthetic fiber yarn has generally been controlled by detecting the tension of the yarn and controlling the rotational speed of the winding shaft based on the tension. However, when winding a very thin yarn with a low tension, it is difficult to accurately detect the tension with the tension detection devices currently in use. Furthermore, as shown in Fig. 1, the relationship between the change in the winding thickness and the change in the rotational speed of the winding shaft as the yarn is wound is that even with a constant change in the winding thickness, the rate of decrease in the rotational speed of the winding shaft is It is necessary to make large changes at various locations in the thickness direction of the wound layer, rather than linearly. Furthermore, in order to increase the success rate during thread winding, it was necessary to change the speed during thread winding and normal winding.

The present invention was obtained as a result of studies aimed at solving the problems in the winding control.

That is, the present invention provides a device for detecting the winding speed of a yarn, and a winding device for controlling the rotational speed of a winding bobbin using a speed control device, in which the speed control device is connected to an initial speed setting device, an actual winding speed, and a winding device. It has a circumferential speed setting device that determines the take-up tension, and only when the detected speed is higher than the predetermined take-up speed, the number of rotations of the take-up bobbin is gradually decreased, and in other cases, the rotation of the take-up bobbin is increased. A speed control circuit that maintains the number of threads constant, and a feedback loop control circuit that consists of an operational amplifier, an amplifier with automatic gain control, and a switch, keep the winding speed constant and reduce the number of threads during winding. The present invention provides a constant speed winding device that reduces fluctuations in string tension and improves the thread winding success rate.

A schematic control system diagram of one embodiment of the constant speed winding device of the present invention is shown in FIG. 2, and its configuration will be explained based on the drawing.

Reference numeral 1 denotes a yarn that is wound at a constant speed, 2 a traverse fulcrum guide, and 3 a yarn winding speed detection device. Reference numeral 4 denotes a winding machine for winding the yarn, which includes a winding shaft 5, an electric motor 6 that drives the winding shaft 5, and a winding machine that contacts the yarn wound around the winding shaft 5 at the same speed as the yarn. It is equipped with a roller bail 7 etc. that rotates following. 8
The winding device 4 receives a signal from the speed detection device 3.
This is a speed control device that converts into a control signal for controlling the rotational speed of the motor, and includes a frequency-voltage converter 9, a peripheral speed setting device 17 that sets the signal from the converter 9 and the winding speed during normal winding. an arithmetic amplifier 10 that compares and amplifies the set value of , a comparator 11 that outputs only the output of the arithmetic amplifier 10 when the speed detection device 3 is larger than the set value; Amplifier 12A with automatic gain control that amplifies the output from
and switchers 13A and 13B that switch the control circuit.
, an integrator 14 that integrates the output from the amplifier 12A with automatic gain control, an amplifier 12B with automatic gain control that amplifies the output of the operational amplifier 10, and a setting signal for the initial speed setter 16. an arithmetic amplifier 15 which inputs the subtraction signal from the integrator 14 and the addition/subtraction signal from the amplifier 12B with automatic gain control; and an initial speed setting device 16 that determines the initial speed that is the speed during the thread winding operation.
and a circumferential speed setting device 17 for determining the actual winding speed during normal winding operations. And operational amplifier 1
0, amplifier with automatic gain control 12B, and switch 13B
A feedback loop control circuit is formed by the above. An inverter 18 receives a control signal from the speed control device 8 and outputs control power corresponding to a change in the signal, and the output of the inverter 18 is supplied to the electric motor 6 of the winder 4.

The speed control operation in the constant speed winding device having the above configuration will be explained.

First, switch switches 13A and 13B are set to the a side circuit,
Turn on the speed control device 8 and inverter 18 switches (not shown). When the circuits of the speed control device 8 and the inverter 18 are turned ON, an initial speed signal set in advance from the initial speed setting device 16 is applied to the operational amplifier 15, and the output of the operational amplifier 15 is applied to the speed control device. 8 is supplied to the inverter 18 as a control signal. The control signal supplied to the inverter 18 is converted into control power and supplied to the electric motor 6 of the winding device 4 to rotate the electric motor 6. At the same time, the winding shaft 5 connected to the electric motor 6 also rotates. As the winding shaft 5 rotates, the roller bail 7 that is in contact with the bobbin inserted into the winding shaft 5 also rotates.

In the above state, the yarn 1 is attached to the bobbin inserted into the winding shaft 5.
and start winding.

Here, in order to facilitate winding of the yarn, the initial speed of the winding shaft 5 is set to be several percent higher than the speed of the yarn 1.

When winding of the yarn is started, the circuit of the switch 13A is switched from the a side to the b side. The integrator 14 starts operating by switching the circuit. At this point, the output of the integrator 14 is zero, so the rotational speed of the winding shaft 5 does not change. When the yarn 1 is wound around a bobbin attached to the winding shaft 5 and the winding thickness of the yarn gradually increases, the winding speed increases and the rotation speed of the roller bail 7 increases. Therefore, the output signal of the speed detection device 3 that detects the rotation speed of the roller bail 7 also increases. A frequency signal, which is an output signal from the speed detection device 3, is converted into a voltage signal by a frequency-voltage converter 9, and the voltage signal of the winding speed input and set in advance from the circumferential speed setting device 17 is converted to a voltage signal by an operational amplifier 10. The output is compared and amplified by the comparator 11. When the speed detection voltage becomes larger than the set value, the comparator 11 outputs an output. This output is transferred to an amplifier 12 with automatic gain control.
A is amplified, and the amplified output signal is input to an integrator 14. When a signal is input to the integrator 14, it starts integration, and its output signal is input to the operational amplifier 15 as a subtraction input. Therefore, the output signal of the operational amplifier 15 is input to the inverter 18 as a control signal smaller than the initial speed setting value. The inverter 18 converts the control input signal into control power and supplies it to the electric motor 6. Therefore, the rotational speed of the winding shaft 5 is reduced by the amount that the control signal is reduced, and the winding speed is controlled so as to approach the set value. When the winding thickness further increases, the above control is repeated, and the yarn 1 is wound while being controlled so as to always approach the set value. Speed control device 8
The operation of the main control circuit is performed as described above. The tension fluctuation of the yarn 1 at this time is as shown in FIG. 3, and the range of fluctuation relative to the target tension value is large, which is not sufficient for a winding device. Therefore, the arithmetic amplifier 1 serves as a control circuit for a minor loop that outputs an acceleration/deceleration signal to the inverter 18 in proportion to the speed deviation.
The output of 0 is amplified by the amplifier 12B with automatic gain control, and the addition/subtraction signal is switched by the switch 13B and input to the arithmetic amplifier 15. By reducing the shoot, the fluctuation width of the yarn tension relative to the target tension value is reduced as shown in FIG. Here, it is preferable that the switch 13B is switched within several minutes after yarn winding is started and the main control circuit is operated.

The control signal that is the output signal of the speed control device 8 includes the winding thickness component of the winding yarn, since the winding speed of the winding shaft, that is, the rotational speed of the electric motor changes as the winding thickness of the yarn increases. Since the control signal containing this winding thickness component is supplied to the amplifiers 12A and 12B with automatic gain control provided in the speed control device, the control gain changes as the winding thickness increases. Highly accurate winding control is possible even in high-speed winding.

Although the present invention can be practiced as described above, it is not limited to the examples.

The electric motor that drives the Γ winding shaft may be directly connected as in the embodiment, or may be connected via a belt or the like.

The traverse device for winding the Γ yarn may be a reciprocating guide, a grooved drum, or other configuration.

The speed detection device for detecting the Γ winding speed may be configured to use a phototube to detect a protrusion or the like provided on the roller bale, and preferably one that can detect it in a non-contact manner.

By configuring the present invention as described above, the following effects can be achieved.

(1) The speed control device is equipped with a speed control circuit consisting of an initial speed setting device that controls the speed during bobbin winding operations, a circumferential speed setting device that controls the speed during normal winding operations, etc. During operation, the bobbin is rotated at a faster speed than the normal winding speed.
The thread can be reliably wound around the bobbin without causing any slack in the thread, and the success rate of thread winding can be increased.

(2) By providing the speed control circuit with a feedback loop control circuit that outputs an acceleration/deceleration signal to the inverter in proportion to the speed deviation, the control gain is changed as the winding thickness increases, and the judgment is made based on this. Since a control signal is output from the speed control device to the inverter, the fluctuation range of the winding speed can be made very small, and even in high-speed winding, highly accurate winding control with small tension fluctuations can be performed. Therefore, a package with a beautiful shape can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between the winding thickness of the yarn and the number of rotations of the winding shaft. FIG. 2 is a control system diagram showing one embodiment of the constant speed winder of the present invention. FIG. 3 is a schematic diagram showing tension fluctuations in the yarn due to the main control operation of the speed control device in the constant speed winding device of the present invention. FIG. 4 is a schematic diagram showing tension fluctuations in the yarn when the main control operation of the speed control device in the constant speed winding device of the present invention is controlled by a minor loop control circuit. 3: Winding speed detection device, 4: Winding machine, 5: Winding shaft, 8: Speed control device, 9: Frequency voltage converter,
10, 15: Arithmetic amplifier, 11: Comparator, 12
A, 12B: Amplifier with automatic gain control, 13A, 1
3B: Switching device, 14: Integrator, 16: Initial speed setting device, 17: Peripheral speed setting device, 18: Inverter.

Claims (1)

[Claims] 1. In a winding device that controls the rotational speed of the winding bobbin by a device that detects the winding speed of the yarn and a speed control device, the speed control device is used as an initial speed setting device and a circumferential speed setting device that determines the actual winding speed. A speed that gradually reduces the rotational speed of the winding bobbin only when the detected speed is higher than the specified winding speed, and otherwise maintains the rotational speed of the winding bobbin constant. A constant speed winding device comprising: a control circuit; and a feedback loop control circuit comprising an operational amplifier, an amplifier with automatic gain control, and a switch.