JPH0327465B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wire winding machine for winding a long wire such as an electric wire using annealed copper wire.

[Conventional technology]

When winding electric wires using annealed copper wire, especially enamelled wires with a thin coating baked on the annealed copper wire, using a wire winding machine, it is necessary to maintain uniform softness of these wires over the entire length, and it is necessary to maintain such properties. Therefore, recent winding machines place emphasis on maintaining a constant tension when winding onto the reel.

Conventional wire winding machines generally use a torque motor to drive the reel as a mechanism to keep the tension of the wire constant as described above, and utilize the drooping characteristic of the torque motor, where the rotational speed decreases as the torque increases. The torque motor is operated so that the rotational speed of the reel decreases in response to the rotational torque of the reel, which increases as the wire rod is wound on the reel in multiple stages. Since the relationship between torque and rotational speed on the reel differs depending on the diameter of the reel and the diameter of the wire, the most suitable operating condition is selected by manually adjusting the voltage applied to the motor.

The wire winding machine disclosed in Japanese Patent Application Laid-open No. 59-27719 winds a continuously fed wire rod to a predetermined length and then attaches the completed reel (full reel) one after another to the winding machine support base. An automatic take-out mechanism is provided to allow automatic removal from the reel, and for this purpose a linear motor is used in the reel mechanism. The reel is mounted on a reel truck in order to be movable in a predetermined direction, and a motor with a linear structure is formed by a rotor provided at the lower end of a reel shaft protruding from the bottom surface of the reel truck and a pair of columnar stators. ing.

[Problem that the invention seeks to solve]

In the conventional wire winding machine described above, the voltage value of the drive motor is manually variable using a bolt slider, for example, to adapt to changes in torque and speed on the reel due to changes in the number of winding stages of the wire wound on the reel. Although the optimum torque-rotational speed characteristic curve is selected by manual adjustment using a voltage device, the characteristics of the drive motor do not necessarily match exactly with the above-mentioned fluctuations in torque and speed on the reel, and in reality There is quite a gap in the middle of the fluctuation,
As a result, the tension may not be constant during the wire winding operation.

Furthermore, if a linear motor is used in the wire winding machine equipped with the automatic reel take-out mechanism,
Since the reels are sequentially replaced by a movable reel truck, the difference in mechanical loss due to the replacement of the reel truck and the gap between the linear coil and the rotating disk greatly affect the accuracy of the output torque on the reel.

Therefore, the optimal wire tension cannot be obtained using the conventional tension setting method using a torque motor to adjust its primary voltage.

This invention was made in view of the above-mentioned current situation, and its purpose is to directly detect the tension of the wire rod and use the tension signal to linearize it as a tension control device for a winding machine that uses a linear motor in the reel cart. To provide a wire winding machine equipped with a tension control device that controls the output of a motor and always applies uniform tension to the wire.

[Means for solving problems]

As a means for solving the above-mentioned problems, the present invention provides a driving section consisting of a traveling wire winding reel, a linear motor for driving this reel, and a stator coil of the linear motor. The wire rod is equipped with a control device that supplies it at a predetermined voltage, a tension sensor that detects the tension of the wire at any position before it is wound onto the reel and converts it into an electrical signal, and an amplifier that amplifies the output signal. The tension signal is fed back to the control device via an amplifier to control the voltage supplied to the linear motor so that the tension is always constant.

[Effect]

As the wire is wound around the reel of the wire winder, the winding diameter increases. In order to keep the winding tension constant, it is necessary to increase the output torque of the motor and decrease the rotational speed in accordance with the increase in the winding torque on the reel. However, in actual winding work, the ratio differs depending on the reel diameter and wire diameter, and in automatic winding machines, there is mechanical loss due to the reel being replaced, and gap between the stator coil and the disc. Therefore, in order to eliminate fluctuations in tension due to these various factors, the drive voltage is adjusted so that the tension on the reel is always constant. This voltage adjustment is directly performed by feeding back a tension signal detected by a tension sensor to a control device.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 shows a motor with a linear structure as the drive unit.
1 shows a wire winding machine consisting of reels mounted on a mobile reel truck; This wire winding machine is provided with a tension sensor 1 that detects the tension of the running wire W. The tension sensor 1 includes a differential transformer 2 between two rollers, and converts the displacement of the roller moved by the tension of the wire W relative to a set value into an electrical signal. This tension sensor 1 is provided at an appropriate position before the running wire rod is wound onto the reel 4 via the traverse guide 3. reel 4
has a rotating disk 5 made of copper or aluminum at the lower end of the reel shaft, and is rotationally driven by a motor with a linear structure consisting of this rotating disk 5 and a pair of columnar stators 6 provided below the rotating disk 5. be done.

The linear motor has an SCR that controls the drive current and voltage supplied to the coil of the stator 6.
A control device 8 is provided. The output signal of the tension sensor 1 is inputted to this SCR control device via an amplifier 7, and the current and voltage to the stator 6 are controlled.

The reel 4 having the linear motor has the following features:
The reel is attached to a movable reel cart 11 that can move the reel so that the reel can be automatically replaced after the continuously fed wire is wound up to a predetermined length.

The operation of this embodiment configured as described above will be explained in the second section.
This will be explained with reference to the figures.

Since the continuously running wire W is supplied to the reel 4 through a large number of rollers etc. provided on its supply path, it can be wound onto the reel 4 while resisting the frictional force of these rollers, and has uniform softness. In order to maintain this over the entire length, it is necessary to always wind the wire with constant tension. However, when the wire W is wound onto the reel 4 with a constant tension, the winding torque increases due to the increase in the number of winding stages of the wire on the reel and therefore the winding diameter, and therefore it is necessary to increase the output of the torque motor. be. Further, when the reel 4 is rotated at the same rotation speed, the circumferential speed on the reel, that is, the winding speed of the wire W increases in proportion to the increase in the reel winding diameter. However, if this winding speed increases more than necessary,
Since this causes an increase in the frictional force, it is desirable to maintain the winding speed at a constant speed. Therefore, in order to keep this constant, the rotational speed of the torque motor must be reduced. In order to wind the wire W with constant tension in this way, the torque motor must be driven so as to meet the above-mentioned conditions of increasing torque and decreasing the number of revolutions.

The torque motor is driven by V ₅ ~ in Figure 2.
If the conventional method is used with a constant driving voltage of V _MAX , the relationship between torque and rotational speed will change on the characteristic curve at each voltage. Therefore, if the actual driving state (torque fluctuation) of a torque motor is as shown by the curve in Figure 2, it approximates the characteristic curve of a torque motor at a constant voltage, and the voltage is a constant voltage. It can be driven by However, the curve (or) indicates the case where the wire diameter is small, the reel shape is small, and the speed is high (high speed, low torque curve), and the curve (or) indicates the case where the wire diameter is large, the reel shape is large, and the speed is low (low speed, high torque curve). ), if the winding requirement is
Winding is impossible if the driving voltage remains constant. If winding is to be done forcibly, a worker will need to be on standby at the manual variable voltage device all the time to finely adjust the voltage V, but this is difficult to do on an actual production line and has extremely poor accuracy.

The wire rod equipped with the control device according to this embodiment can be used even when the reel has a large thickness ratio (ratio of the reel body diameter to the full reel diameter) (larger reel), or the wire rod diameter is large, which was conventionally considered impossible to wind. Winding is possible with a winding machine. This effect will be explained in the case of a curve.

When the reel 4 is replaced by the reel cart 11 and the reel 4 starts winding the wire, the wire is wound by overcoming the frictional resistance on the supply path.
A certain predetermined tension is generated in the wire. This torque at the beginning of winding varies depending on the reel diameter and wire diameter, but
Assuming that the winding start torque is marked with ○ in the diagram,
As the winding progresses, the number of winding stages increases and the winding diameter increases. The output torque of the torque motor tends to increase on the voltage curve at the beginning of winding in response to the increase in the winding torque due to the increase in the winding diameter, and at the same time, the rotational speed decreases. However, if the diameter of the wire is large, the increase in the winding torque due to the increase in the winding diameter is greater, and the increase in the output torque of the torque motor on a constant voltage curve will result in insufficient torque. The tension decreases below the target tension. This decrease in tension is detected by the differential transformer 2 of the tension sensor 1, and this low voltage signal is amplified by the amplifier 7.
It is input to the SCR control device 8 as a feedback signal. In response to the feedback signal, the SCR control device 8 increases the voltage supplied to the stator coil of the linear motor to a voltage value that can eliminate the shortfall in the output torque. In this way, when the diameter of the wire is large, the above-mentioned control is performed continuously as the number of winding stages increases, and the winding ends when the wire changes as shown in the curve shown in the figure.

The effect in the case of the curve is completely opposite to that in the case of the curve, because the wire diameter and reel shape are small.
Although the increase in the winding torque due to the increase in the number of winding stages of the wire is small, even this slight increase in torque causes a change in the output of the torque motor. If the driving voltage remains constant, the output of the torque motor will increase significantly according to its characteristic curve, and therefore the tension of the wire will also increase significantly. The change in tension is similarly detected by tension sensor 1, and this signal
The SCR controller 8 reduces the drive voltage. When the drive voltage decreases, the rotational speed of the torque motor also decreases, and the winding ends with a change as shown in the curve.

[Effect] Since the present invention is configured as described above, changes in tension are detected by a tension sensor, and the increase/decrease of the signal is used to control the drive voltage of the torque motor via the SCR control device so that the tension of the wire is always constant. can be optimally controlled.

Such control is possible regardless of the wire diameter and reel diameter, and even in the case of small wire diameter and small reel shape, or wire diameter R and large reel shape, which was previously considered impossible.
By detecting the wire tension, it can always be driven in an optimal state.

[Brief explanation of drawings]

Figure 1 is an overall schematic diagram showing the state in which a control circuit using a tension sensor is installed in a wire rod winding machine with a linear motor with a reel attached to a mobile reel cart, and Figure 2 shows the relationship between torque and rotational speed. Characteristic curves can be shown. 1...Tension sensor, 4...Reel, 7...Amplifier, 8...SCR control device, 11...Reel truck.

Claims (1)

[Scope of Claims] 1. A drive section consisting of a reel for winding a running wire, a motor with a linear structure that drives this reel, and a control for supplying a drive current at a predetermined voltage to a stator coil of the motor with a linear structure. It is equipped with a device, a tension sensor that detects the tension of the wire at any position before it is wound into a reel and converts it into an electrical signal, and an amplifier that amplifies the output signal. 1. A wire winding machine characterized in that the voltage supplied to a linear motor is controlled so that the tension is always constant by feedback to a control device through the wire winding machine. 2. The wire winding machine according to claim 1, wherein the tension sensor is constituted by a differential transformer. 3. The wire winding machine according to claim 1, wherein the control device is an SCR control device.