JPH08333053A - Tension adjusting device - Google Patents

Abstract

PURPOSE: To reduce the tension fluctuation when an electric wire is wound at a high speed by suspending a guide roller reciprocated in response to the tension fluctuation of the electric wire with a spring made of a linear or belt- like polymer material. CONSTITUTION: The dancer roller 28 of a tension adjusting device is rotatably supported on a shaft 30 assembled in a shuttle plate 29 via a bearing 31. The shuttle plate 29 is held only reciprocatably by a guide plate 32 fixed to a sub- base 23 by a pair of holding plates 33 having guide grooves. One end of a nylon thread spring 35 is fixed to the hole provided at the center of the lower end of the shuttle plate 29, and the other end is fixed to the hole provided at the right end of a lever plate 36. The displacement of an output shaft 5 is made maximum upward and downward at the rotation angle of a flyer indicating the maximum or minimum value of the electric wire tension, a dancer roll assembly 150 suspended by the nylon thread spring 35 is vertically moved, and a slack can be applied to the electric wire to mitigate the tension fluctuation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension adjusting device for reducing tension fluctuation of an electric wire when winding a field coil, an armature coil, etc. of an electric motor by a winding machine.

[0002]

2. Description of the Related Art A conventional tension adjusting device for a winding machine for a series motor is shown in FIG. It has a structure in which the dancer roller 200 is suspended by a coil spring 201 made of metal via a plate 202. The tension setting device 71 clamps the electric wire 7 to give an appropriate tension, and the flyer of the winding machine described later is used as an armature. When the wire 7 is wound, the electric wire 7 is paid out, and when the tension of the electric wire 7 increases, the coil spring 201 extends and the dancer roller 200
Moves upward and loosens the wire 7 to relieve the tension,
When the tension is reduced, the coil spring 201 is contracted and the dancer roller 200 is displaced downward, the electric wire 7 is pulled, the tension of the electric wire 7 is increased, and the fluctuation of the tension of the electric wire 7 is reduced.

As an example of the metal tension coil spring 201 used in the dancer roller 200, the material is piano wire, the wire diameter is 1.2 mm, and the coil outer diameter is 16 mm.
The total number of turns is 223 and the spring constant is 3 Kg / m.
Becomes The mass of the coil spring 201 is 93 g, and when the coil spring 201 expands and contracts, it is equivalent to a weight of about 31 g hanging at one end of the coil spring 201 due to its own weight. Dancer roller 200
The mass of the dancer roller 2 suspended on the coil spring 201 is about 100 g including the mass of the plate 202.
The natural frequency of 00 is about 2.5 Hz.

When the winding is wound around the armature of the series motor, the shape of the coil to be wound is not a circle but a rectangle. Therefore, even if the rotation speed of the flyer of the winding machine is constant, the winding speed of the electric wire 7 wound around the armature periodically fluctuates, and the inertial mass of the electric wire 7 on the way of winding, the dancer roller 200
Tension fluctuations occur due to the followability of, the feeding speed of the electric wire 7, and the like. When the tension of the electric wire 7 during winding is measured, the maximum value and the minimum value appear periodically as shown in FIG. Looking at the relationship between the outer shape of the armature and the tension of the electric wire 7 when the flyer of the winding machine winds the armature, the tension of the electric wire 7 becomes smaller when the electric wire 7 is wound in the slot part of the armature core. , Electric wire 7
The tension increases when the coil exits the slot and is wound around both ends of the coil end. That is, when the flyer makes one revolution around the armature, the tension fluctuations occur twice, and the tension of the electric wire 7 periodically shows the maximum value and the minimum value depending on the phase of the flyer.

Since the winding speed of the winding machine of the series motor armature is 1000 to 3000 revolutions per minute, the tension fluctuation of the electric wire 7 due to the rotation of the flyer of the winding machine is several tens to 100.
It also becomes Hz. Therefore, the metal coil spring 201
Since the natural frequency of the dancer roller 200 suspended by is far exceeded, the dancer roller 200 cannot follow the tension fluctuation of the electric wire 7 in the course of winding. Therefore, when the tension of the electric wire 7 increases and a load is applied to the coil spring 201, the coil spring 201 contracts and the dancer roller 200 pulls the electric wire 7, and when the tension of the electric wire 7 decreases and the load applied to the coil spring 201 decreases, the coil spring 201 Will be extended and the dancer roller 200 will move to loosen the electric wire 7, and the function of reducing tension fluctuation will not be fulfilled. That is, one dancer roller 200 suspended on the coil spring 201 is used to eliminate the slack of the static electric wire 7 when the electric wire is mounted, and to reduce the tension fluctuation of the electric wire 7 when winding the wire. Therefore, the latter function is sacrificed. Has become.

On the other hand, there is an attempt to reduce the tension fluctuation of the electric wire 7 during winding by attaching the dancer roller 200 to an actuator and displacing the dancer roller 200 in conjunction with the fluctuation of the tension of the electric wire 7. It is difficult to obtain satisfactory results because it is difficult to synchronize the displacement movement of the dancer roller 200 with the fluctuation.

[0007]

As described above, the conventional tension adjusting device is not effective in reducing the tension fluctuation of the electric wire when winding at high speed. An object of the present invention is to provide a novel tension adjusting device provided with a dancer roller that makes a displacement movement corresponding to a tension variation at the time of winding, and reduce a tension variation of an electric wire.

[0008]

[Means for Solving the Problems] When winding the armature of a series motor in a flyer winding machine, the high-speed rotation of the flyer causes periodic fluctuations in the tension of the electric wire. It is doubled, and the tension fluctuation waveform can be regarded as a substantially sine wave. For example, winding speed 15
When it is set to 00 rotations / minute, the tension fluctuation waveform of the electric wire can be regarded as a 50 Hz sine wave. It was confirmed by experiments that a lightweight dancer roller was constructed by suspending a nylon tension coil spring instead of a metal tension coil spring to improve the followability of the dancer roller with respect to tension fluctuation. When a 9 g dancer roller was suspended by bundling two nylon threads having a diameter of 0.33 mm, it was possible to follow the tension fluctuation of about 80 Hz.
However, while the mechanism in which the dancer roller is simply suspended by nylon thread has a remarkable effect on the winding whose electric wire tension fluctuation is 50 Hz or less, it is less effective when the electric wire tension fluctuation is 50 Hz or more. This is because the increase in the winding speed increases the average tension and tension fluctuations due to inertia, etc., while the spring made of nylon thread loses the proportional relationship between tension and displacement at tensions above a certain level, so the nylon thread is deformed. It is thought to be difficult to do.

In order to reduce the tension fluctuation of 50 Hz or more, it is effective to use an actuator such as a voice coil motor to forcibly displace the dancer roller suspended by a nylon thread in accordance with the tension fluctuation to alleviate the tension fluctuation. Is. As shown in FIG. 10, when winding with a flyer winding machine, the tension fluctuation can be regarded as a sine wave having two peaks in one cycle, and the amplitudes of the two peaks, that is, the sine waves are substantially equal. Therefore,
A displacement command signal for the output axis of the voice coil motor, such as a sine wave signal, is created in advance for each phase of one flyer rotation, and is transmitted to the driver of the voice coil motor during winding to synchronize the displacement of the output axis with the tension fluctuation. A method of relaxing the tension fluctuation is suitable. The slight phase difference is adjusted by utilizing the expansion and contraction of the nylon thread spring, and the tension fluctuation can be reduced. A large phase difference is achieved by electrically correcting the phase of the displacement command signal.

When the driving frequency of the voice coil motor becomes high, it becomes difficult to secure the displacement amount of the voice coil motor itself. Therefore, a displacement magnifying mechanism of the output shaft of the voice coil motor using a lever is provided to secure the forced displacement amount of the dancer roller. The means to do was provided. In addition, a separate guide roller that has the function of eliminating the static slack that occurs when the wire is attached to the commutator riser part of the armature is shared, and the function is shared with the dancer roller to reduce the tension fluctuation during winding. Let

[0011]

In the tension adjusting device constructed as described above, the displacement movement of the dancer roller can be made to follow the tension variation during winding, and the tension variation can be reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In FIG. 2, there is a shaft 5 held by a bearing 4 mounted on a bearing holder 3 fixed on a pedestal 2 of a winding machine 1 and a shaft 6 fitted inside the shaft 5, and the shaft 6 has an electric wire 7 at its center. Is provided with a hole through which the electric wire 7 exits, and a guide roller 8 is rotatably supported in the window. The flyer 9 is attached to the shaft 6 via a flange 10, rotates together with the shaft 6, and a winding guide 12 is rotatably held at the tip of the shaft 6 via a bearing 11. A pair of winding guides 12 are provided to sandwich the armature 13. Guide roller 14 and guide roller 15 on the flyer 9
Is rotatably supported and guides the electric wire 7 to the armature 13.

In FIG. 1, the tension adjusting device 20 is fixed to the end of the gantry 2 of the winding machine 1 via a base 21, and the sub-base 23 is fixed to the base 21 with four stays 22. A plate 24 is vertically fixed on the sub base 23, and two shafts 25 are vertically set on the plate 24. Two
A guide roller 26 and a guide roller 27 are respectively attached to the shaft 25 of the book.
Is rotatably supported. In FIG. 5, the dancer roller 2
8 is rotatably supported by a shaft 30 incorporated in a shuttle plate 29 via a bearing 31. Dancer roller 2
8, the shuttle plate 29, the shaft 30, and the bearing 31 form a dancer roller assembly 150. Dancer roller assembly 1
In order to reduce the weight of No. 5, the dancer roller 28 is made of thin plastic and the shuttle plate 29 is made of aluminum having a thickness of 2 mm, and the amount of waste is reduced. The shaft 30 is also made of hollow aluminum. With these measures, the mass of the dancer roller assembly 150 could be about 9 g. The mass of the nylon thread spring 25 is a negligible mass. The shuttle plate 29 is held by a pair of guide plates 32 having a guide groove so that it can reciprocate only, and the guide plate 32 is fixed to the sub-base 23 by a holding plate 33. Shuttle plate 29
One end of a nylon thread spring 35 is fixed to a hole 34 provided at the center of the lower end of the nylon thread spring 35, and the other end of the nylon thread spring 35 is fixed to a hole provided at the right end of the lever plate 36. 6, the guide roller 37 is rotatably supported by the lower end of the slide bar 38 via a support frame 39, and the slide bar 38 is shown in FIG.
As shown in FIG. 5, the plate 24 is reciprocally held in a hole provided in the support plate 40 fixed to the upper end of the plate 24. A flange 41 is fixed near the upper end of the slide bar 38, and the spring 42 provided between the flange 41 and the support plate 40 suspends the slide bar 38 in the air. The hole orthogonal to the slide bar 38 is the support plate 40.
The rubber bush 45 is inserted into this hole.
Attach the rubber bush 45 to the cylinder shaft 44 of the air cylinder 43.
The air cylinder 43 is fixed to the upper end of the plate 24 via the auxiliary plate 46 so that the air cylinder 43 can be compressed by.

In FIG. 4, a voice coil motor (hereinafter simply referred to as a motor) 51 is fixed below the sub base 23 via four stays 50, and an output shaft 52 of the motor 51 is fixed.
A roller 54 is rotatably held on the upper end of the roller via a roller holder 53. The roller 54 is fitted in the through window 55 provided in the lever plate 36 in the vertical direction without any gap, and serves as a leverage point. In order to convert the reciprocating motion of the output shaft 52 of the motor 51 into the swing motion, the through window 55 is provided with a gap on the left and right. The left end of the lever plate 36 is rotatably supported by a lever bearing block 56 fixed to the upper surface of the motor 51 via a lever bearing 57, and serves as a lever fulcrum. A hole provided near the right end of the lever plate 36 for fixing the nylon thread spring 35 serves as the lever action point.

A concave meter support frame 6 is provided at the lower end of the motor 51.
0 is provided, and the potentiometer 6 is attached to the meter support frame 60.
1 is fixed. The upper end of the slide shaft 62 of the potentiometer 61 is connected to the lower end of the output shaft 52 of the motor 51,
The slide shaft 61 and the output shaft 52 are integrated.

As shown in FIG. 1, a suspension shaft 70 is fixed near the right end of the base 21, and a tension setting device for providing an appropriate wire tension to the suspension shaft 70 for winding a coil without looseness on the armature 13. 71, a dust removing device 72 that removes dust and the like adhering to the electric wire 7, and an electric wire gate 73 provided so that the electric wire 7 can be paid out from the electric wire bobbin 74 without delay.

The rotary encoder 100 shown in FIG.
Rotation is transmitted at a reduction ratio of 1: 1 by the shaft 5 and the timing belt shown in FIG. 2, and the phase signal of the rotation angle θ of the flyer 9 shown in FIG.
9 and sends it to the displacement command signal generator 101 which is the displacement signal of the motor 51 shown in FIG. 9, the displacement signal of the motor 51 corresponding to the predetermined rotation angle θ of the flyer 9 from the displacement command signal generator 101. Are sent to the motor 51 via the motor driver 102. Displacement command generator 101 and motor driver 102 for adjusting the phase of the displacement signal
A displacement command signal phase setting device 104 is provided between the two. A drive current is supplied from the motor driver 102 to the motor 51 according to the displacement command signal, the displacement signal of the output shaft 52 is fed back from the potentiometer 61 to the motor driver 102, and the output shaft 52 of the motor 51 is output from the displacement command signal generator 101. Is displaced in response to.

The electric wire 7 follows the route described below. That is, the electric wire 7 wound around the electric wire bobbin 74 is the electric wire gate 7
3. After passing through the dust removing device 72, the tension setting device 71 receives an appropriate clamping force to give a predetermined static tension, and then the guide roller 37, the dancer roller 28, and the guide roller 27.
Half a round, and further 1/4 round the guide roller 26 into the hole of the shaft 6 of the winding machine, and the direction can be changed by the guide roller 8.
Exit the window on the shaft 6 towards the flyer 9. Then flyer 9
Proceeding above the flyer 9 via the guide roller 14 at the right end, the guide roller 15 at the tip of the flyer 9 makes about 1/4 round and reaches the armature 13.

In the above structure, when the winding machine 1 winds the armature 13, the tension adjusting device 20 operates and the electric wire 7
The fluctuations in tension of P are reduced as follows. When the flyer 9 rotates, the electric wire 7 connected to the commutator riser portion of the armature 13 held by the winding guide 12 is wound around the core of the armature 13. Then, the electric wire 7 is pulled out from the electric wire bobbin 74, passes through the electric wire gate 73, the dust removing device 72, and the tension setting device 71, and passes through the respective guide rollers 37, 28, 27, and 26. At this time, since the shape of the coil wound around the armature 13 is not a circle but a rectangle, the tension of the electric wire 7 wound around the armature 13 is as shown in FIG. 10 even if the rotation angular velocity due to the rotation angle θ of the flyer 9 is constant. It fluctuates periodically as shown. In FIG. 7, the flyer 9 is set on the flyer locus 155.
Is rotated counterclockwise, the tension at the time of winding the electric wire 7 is measured. When the electric wire 7 is wound around the slot portion 152 of the core of the armature 13, the tension becomes small, and the electric wire 7 comes out of the slot and ends of the coil. It has been found from experiments by the inventors that the tension increases when wound on 153.

Therefore, the flyer 9 showing the maximum value of the electric wire tension.
At the angle of rotation of the output shaft 52, the displacement of the output shaft 52 is maximized upward, and the dancer roller assembly 150 suspended by the nylon thread spring 35 is moved upward to loosen the electric wire 7 to relieve tension. When the tension is at the rotation angle of the flyer 9 that exhibits the minimum value, the displacement of the output shaft 52 is maximized downward, so that the dancer roller assembly 150 can loosen the electric wire 7 to suppress the decrease in the tension, and the fluctuation in the tension of the electric wire 7. To reduce. Since the fluctuation of the tension can be regarded as a sine wave having two peaks in one cycle, the displacement command signal of the motor 51 is a sine wave having two peaks in one cycle, and the displacement command signal generator 101 sets the displacement command signal phase by setting an appropriate maximum displacement amount. It transmits to the setter 104. The displacement command signal phase setter 104 determines the tension waveform and the output shaft 52 of the motor.
When there is a phase difference between the displacement waveforms of, the phase difference is electrically adjusted. When the displacement signal is transmitted to the motor driver 102, a drive current is supplied from the motor driver 102 to the motor 51 and the output shaft 52 is displaced. For the displacement of the output shaft 52, the position signal from the potentiometer 61 is output by the motor driver 10.
Since it is fed back to 2, the displacement set for the output shaft 52 can be obtained. A slight phase difference between the tension fluctuation and the displacement of the output shaft 52 is adjusted by the expansion and contraction of the nylon thread spring 35, and the tension fluctuation of the electric wire 7 and the dancer roller assembly 15 are adjusted.
The displacement of 0 is synchronized and the fluctuation of the tension of the electric wire 7 can be reduced.

When the electric wire 7 passes through the dancer roller 28, the tension of the electric wire 7 before passing through the dancer roller 28 and the tension of the electric wire 7 after passing through the dancer roller 28 are not the same. Therefore, the dancer roller assembly 150 receives a force that swings left and right due to the difference in tension. The oscillating motion reduces the fluctuation of the tension of the electric wire 7, and the dancer roller assembly 15
Inhibits 0 reciprocating motion. Therefore, the dancer roller 28 is rotatably supported on the shuttle plate 29, and the shuttle plate 29 is provided with a pair of guide plates 3 provided with guide grooves.
It was held at 2 so that it could only reciprocate.

In case the displacement of the output shaft 52 of the motor 51 is insufficient, a displacement magnifying mechanism utilizing a lever is provided for the motor 5.
Installed in 1. The roller 54, which is the focus point, is the roller holder 5.
The lever plate 36 is reciprocated by the output shaft 52 through the lever 3, and the lever plate 36 swings about the lever bearing 57. Therefore, the window of the lever plate 36 into which the roller 54 fits is provided with a gap on the left and right. One end of the nylon thread spring 35 is fixed in a hole provided near the right end of the lever plate 36. A lever ratio of 2 to 4 can be implemented. If the lever ratio is large, the output shaft 52
Is increased, and the thrust force of the motor 51 becomes insufficient, which may make driving impossible. In this embodiment, the lever ratio is 2.

The guide roller 37 serves to eliminate static slack that occurs when the electric wire 7 is attached to the armature 13. When the electric wire 7 has slack, the spring 42 pushes up the flange 41 fixed to the slide bar 38, so that the support frame 3
Guide roller 3 fixed to slide bar 38 via 9
7 is moved upward, and the electric wire 7 is tensioned to remove the slack. To fix the slide bar 38, when the air cylinder 43 is operated, the cylinder shaft 44 moves to the left, compresses the rubber bush 45, presses the slide bar 38 against the side wall of the hole of the support plate 40, and fixes it with a frictional force. During winding, the guide roller 37 is rotatably supported and does not reciprocate. This is because the function of the dancer roller assembly 150 is not exerted when reciprocating.

FIG. 11 shows the wire tension, the displacement of the dancer roller 28, the displacement of the output shaft of the motor 51, and the displacement command signal when winding is performed using the tension adjusting device of the present invention. The phase of the displacement command signal is adjusted by the displacement command signal phase adjuster 104 so that the waveform of the displacement of the output shaft of the motor 51 overlaps the tension waveform in which the fluctuation of the wire tension is not reduced as shown in FIG. Then, as shown in FIG. 11, the displacement command signal causes displacement of the output shaft 52 of the motor 51, the lever plate 36 swings, and the dancer roller 28 suspended by the nylon thread spring 35 attached to the tip of the displacement roller generates a displacement command signal waveform. And a movement showing a slightly different displacement. As a result, tension fluctuations are halved.

In order to effectively use the tension adjusting device of the present invention, the following should be done. Dancer roller assembly 150
When the performance of the actuator such as the motor 51 for driving the motor is excellent, the lever mechanism is unnecessary. Dancer roller 28
The amount of forcible fluctuation given to is in the range of 0 to 6 mm. Even if only the nylon thread spring 35 is displaced, fluctuations in tension of 50 Hz or less can be reduced. When synchronizing the tension waveform of the electric wire 7 with the displacement waveform of the output shaft of the actuator, the phase difference is set to ± 15 °. Nylon thread spring 35 has a thickness of 0.205 to 0.6 m
m. It is also possible to bundle thin nylon threads into 2 to 4 threads for use. The length of the nylon thread spring 35 is 4 to 16c.
m. It is important that the dancer roller assembly 150 be as light as possible.

[0026]

According to the present invention, since there is little fluctuation in the wire tension during winding, it is possible to form a coil with no looseness and a small fluctuation in elongation.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing an embodiment of a tension adjusting device of the present invention.

FIG. 2 is a partial sectional side view showing a flyer winding machine equipped with the tension adjusting device of the present invention.

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is an enlarged view showing a main part of the tension adjusting device of FIG.

FIG. 5 is an enlarged view showing a main part of FIG.

FIG. 6 is a side view showing a guide roller portion 37.

FIG. 7 is an explanatory side view showing a positional relationship between a locus of a guide roller, an armature, and an electric wire.

FIG. 8 is a schematic diagram showing a rotation angle θ of a flyer.

FIG. 9 is a block diagram showing an example of a motor drive system.

FIG. 10 is a graph showing electric wire tension when wound with a conventional tension adjusting device.

FIG. 11 is a graph showing the wire tension, the displacement of the dancer roller and the output shaft of the motor, and the displacement command signal when wound by the tension adjusting device of the present invention.

FIG. 12 is a partial cross-sectional side view showing an example of a conventional tension adjusting device.

[Explanation of symbols]

28 is a dancer roller, 29 is a shuttle plate, 32 is a guide plate, 35 is a nylon thread spring, 36 is a lever plate, 37 is a guide roller, 38 is a slide bar, 4
3 is an air cylinder, 51 is a voice coil motor, 61 is a potentiometer, 100 is a rotary encoder, 10
1 is a displacement command signal generator, 102 is a motor driver, 1
Reference numeral 04 is a displacement command signal phase setter, and 150 is a dancer roller assembly.

Claims (7)

[Claims] 1. A tension adjusting device for forming a passage of an electric wire by a plurality of guide rollers, and reciprocating at least one of the guide rollers according to a change in the tension of the electric wire to reduce the change in the tension of the electric wire. A tension adjusting device characterized in that the guide roller, which reciprocates according to a change in tension of an electric wire, is suspended by a spring made of a linear or band-shaped polymer material. 2. The tension adjusting device according to claim 1, further comprising means for restraining a movement direction of the guide roller so that the guide roller reciprocates only in a suspending direction. 3. A tension adjusting device for forming a passage of an electric wire by a plurality of guide rollers, and reciprocating at least one of the guide rollers according to a change in tension of the electric wire to reduce fluctuation in the tension of the electric wire. A tension adjusting device comprising an actuator for forcibly reciprocating the other end of a spring made of a polymer material in the form of a thread or a band on which a guide roller is suspended. 4. An actuator that reciprocates the other end of a spring made of a polymeric material in the form of a thread or a band, which suspends a guide roller while the flyer of the winding machine makes one turn of the coil, based on the rotational phase of the flyer. The tension adjusting device according to claim 3, wherein the tension adjusting device is provided. 5. The tension adjusting device according to claim 3, wherein the actuator is provided with a phase adjusting function of a displacement command signal of the actuator. 6. The tension adjusting device according to claim 3, further comprising a mechanism for increasing the displacement of the output shaft of the actuator. 7. A tension adjusting device for forming a passage of an electric wire by a plurality of guide rollers, and reciprocating at least one of the guide rollers according to a change in tension of the electric wire to reduce fluctuation in the tension of the electric wire. A tension adjusting device comprising means for fixing another guide roller capable of reciprocating movement when one guide roller reciprocates during drawing.