JPS6038306B2 - Wire tension control device in winding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for controlling periodic changes in the feeding speed of the wire wound around the non-circular winding frame when the wire is wound to form an aligned coil wound around the non-circular winding frame. The present invention relates to a tension control device that prevents such fluctuations in the tension of an electric wire and keeps the tension of the electric wire constant.

When aligning and forming multilayer coils on a non-circular winding frame,
It is clear that when a winding frame attached to a rotating shaft rotates at a constant speed, periodic changes occur in the feeding speed of the wire to be wound depending on the rotational position of the rotating shaft.

In general, when winding the wire, when the winding speed of the wire suddenly decreases, the tension of the wire decreases drastically due to the inertial force of the wire, the tensioner reel, etc., and when the winding speed decreases significantly, the wire becomes slack. arise. Conversely, when the winding speed increases rapidly, the tension in the wire increases for the same reason. When winding a wire around a non-circular winding frame, this phenomenon appears as the tension changes more rapidly as the winding speed increases. Such a phenomenon in which the tension suddenly changes is not desirable in terms of the winding process. This is because if the tension drastically decreases, the wire will become slack, making it difficult to wind in alignment immediately after that, and if the supply speed increases rapidly, the tension will increase and the wire will stretch, causing the unit The resistance value per length changes,
Alternatively, the coating insulation material may peel off from the surface of the wire, resulting in insufficient insulation, or in the worst case, the wire may break. As described above, fluctuations in the tension of the wire pose various problems in the winding process, so it is desirable to keep the tension as constant as possible.

For this reason, control mechanisms for keeping the tension constant have been considered in the past, but the reality is that the control is not sufficient. FIG. 1 shows an outline of a conventional control mechanism.
According to this figure, the electric wire 2 for winding is fed from a winding reel 1, wound around the brake reel 12 a suitable number of times, and then passed through the roller 3 attached to the tip of the roller support rod 4. It is supplied to the reel side (not shown). The reason why the electric wire 2 is fed in the direction of the arrow A is based on the fact that a tensile force is applied to the electric wire 2 from the winding frame side due to the rotation of the winding frame. in this case,
If the tensile force changes, the tension will also change, but in order to absorb this tension change and keep the tension constant,
This is a brake reel 12 whose braking force can be changed by changing the tension. That is, if there is a change in the tension in the electric wire 2, that change will appear as a change in the rotational position of the roller support shaft 4 with the fulcrum 6 as the rotational fulcrum. 1
The rotational position of the brake reel support rod 9 changes with reference to 1 as the rotational fulcrum.

In this case, a brake reel 12 having an electric wire 2 wound thereon and a sub-brake reel 14 are rotatably attached to the end of the brake reel support 9, and a fulcrum 17 is provided on the outer peripheral surface of the sub-brake reel 14. The brake shoe tortoise 3 is attached as a rotation fulcrum so as to be pressed into contact with it, and the pressing contact force is variably controlled depending on the tension of the electric wire 2. The rotation position of the brake reel support rod 9 changes at the fulcrum 17.
with the brake shoe 13 and the device body 1 at the end.
a brake lever 16 having a spring 15 between it and 8;
This appears as a rotational position change, and the pressing contact force of the brake shoe i3 by the spring 15 is adjusted by the rotational position change. As a result, the rotational torque of the brake reel 12 is controlled via the sub-brake reel 14, and a constant tension is applied to the electric wire 2. Note that there is no need to particularly explain the actions of the springs 5 and 10. According to this control mechanism, no particular problem occurs unless the tension changes rapidly.

However, in the case of a sudden change in tension, the entire control mechanism such as the support bars 4 and 9 that transmits tension changes has a large inertia, and not only does it lack quick response, but also in the case of an unfavorable situation, the roller support rods 4, 9, etc. 9 causes vibration, which has the drawback that constant tension control cannot be performed well. An object of the present invention is to maintain a constant tension of the wire applied to the winding frame even if the winding speed of the wire changes periodically. The aim is to form

In the present invention, a non-circular coil winding frame is attached to the zero rotation axis.
a rotary position setting means having a position detection target according to the shape of the coil winding frame; a phasing means for attaching the winding frame in the same phase with the rotary position setting means and the winding frame shape; It is characterized by comprising a control means for outputting a predetermined brake voltage in accordance with the shape of the winding frame and controlling the supply speed of the electric wire, and a pretension means for applying a constant tension to the brake means and the supply electric wire in advance. be. Embodiments of the present invention will be described in detail below with reference to FIGS. 2 to 4.

First, FIGS. 2a and 2b will be explained. FIG. 2a shows the overall structure of the electric wire tension control device, and FIG. 2b shows a part of it as seen from a different direction. As shown,
The rotating shaft 20 has a stepped shape, and its large flanges 20a
A circular plate 22 for detecting the rotation angle is fixed therein, and has holes A, B, C, .

Further, a screw thread is formed at the end of the small diameter portion 20b of the rotating shaft 20, and a rectangular winding chest 51 for forming a rectangular coil is provided on the lower portion 20b. A winding frame 21 having a circular mounting hole 52 and flanges 53a and 53b on both sides is fitted with iron. A notch 54 is formed in the twill portion of one collar 53a of the winding frame 21, and the pin 50 of the disc 22 competes with the notch 54.
The phase of the position detection holes A, B, C, . . . , L provided in 2 can be matched. With this positioning, the winding frame 21 is fixed to the rotating shaft 20 by screwing the nut 55 into the small recess 20b. This rotating shaft 20' can be rotated in the direction of arrow P by a drive source (not shown). The holes A, B, C, . . . for detecting the rotation angle of the winding frame 21 formed in the disk 22 are
L is provided forward by a rotation angle corresponding to the time constant of an electromagnetic brake 28, which will be described later.

Furthermore, holes A, B, IC, ..., L are provided above this disk 22.
A detector 23 using a photosensor for detecting is attached, and is connected so as to send a hole position signal detected by rotation of the disk 22 as a pulse signal to a shift register 24 to be described later. In addition, 25 is an electric wire 26 for winding.
27 is a brake reel having an electromagnetic brake 28; 29 is a pretension device that applies a constant tension to the wire 26 when the wire 26 is fed from the reel 25; 30 and 31 are supply The guide reel and rollers of the electric wire 26 are shown.

Then, by rotationally driving the rotating shaft 20 and traversing the roller 31 in the direction of the arrow Q by a driving means (not shown), the reel 25 is moved in the direction of the arrow B via the pretension device 29, the brake reel 27, and the reel 30. The electric wire 26 drawn out is wound around the winding trunk 51 of the winding frame 21 as a coil 32 in a multilayered manner. When winding the wire 26 around the winding frame 21, it is clear that the tensile strength (pulling speed) of the wire is different between the corners and flat parts of the winding frame, and the tension fluctuates rapidly. In order to absorb this, the present invention provides a disc 22 and a detector 23 for detecting the rotation angle position, which control the speed of the winding according to the shape of the winding frame, and an electromagnetic brake 28 attached to the brake reel 27 and the position The electromagnetic brake 28 is activated by the detection signal.
A control circuit 40 controls the voltage applied to the power supply line 26, and a pretension device 29 applies a constant tension to the power supply line 26.

With this configuration, if the electromagnetic brake 28 is controlled according to the rotation angle of the winding frame 21 in consideration of its responsiveness, the tension can be kept almost constant by following the corners and flat parts of the rectangular winding frame 21. It can be rolled up. Next, the control means for the electromagnetic brake 28 that controls the tension of the supply wire 26 will be described.
The detector 23 detects C, .

That is, the control circuit 40 receives output pulses from the detector 23, and includes a shift register 24 that outputs shift pulses for each rotation angle, and a data register that outputs five types of data according to the output pulses from the shift register 24. 'An amplifier 4 formed by connecting a selection circuit 33, switches 34 to 38 whose switching is controlled by the output of the data selection circuit, and variable resistors 41 to 45 and resistors 46 and 47 for setting the brake voltage.
It consists of 8. How the electromagnetic brake 28 is controlled based on the output pulse from the detector 23 is shown in the waveform diagrams of FIGS. 3 to 6 and the time chart of FIG. 7.

Figure 3 shows the electric wire 2 taken out from the reel 25 in Figure 2 a.
6 is wound around the winding frame 21 once, the tension applied to the electric wire 26 changes in Q and V, and FIG. 4 shows the linear velocity at that time.

The symbols A, B, C, . . . , L, A′ in the drawing indicate the positions where voltage is applied to the electromagnetic brake 28 by detection of the holes A, B, C, . This is what is shown. Moreover, FIG. 5 shows the braking force at each position, and there is a time difference between the time when the brake voltage is applied to the electromagnetic brake 28 and the time when the brake force generated by the application of the brake voltage is generated. Since there is a time lag (time constant), the brake voltages V^, VB, Vc, Vo, and VF are applied in advance in five steps as shown in FIG. 6 in consideration of the time lag. Note that this voltage value is set using variable resistors 41-45. Hereinafter, the operation when the winding frame rotates once will be explained according to the time chart shown in FIG.

First, the winding frame 21 is inserted into the small diameter portion 20b of the winding shaft 20 to which the disc 22 is fixed, and the disc 22 is inserted into the notch 54 of the winding frame 21.
While the pins 50 are joined together, a nut 55 is screwed in from the outside to fix it. Then, the electric wire 26 is let out from the reel 25, and the pretension device 29 and the brake reel 2
7. Wind the conch shell around the same part 51 via the guide reel 30 and roller 31. When the rotating shaft 20 is rotated in this state, the pulses A, B, C, ..., L, which are output in time series from the angular position detector 23 as shown in FIG.
Enter 4. Therefore, the shift register 24
Output pulses such as C, 2, T, H, and G in the shift register data load pulse (Fig. 7) that is generated every half rotation, and repeat this in the next half rotation. Output. This output pulse is input to the data selection circuit 33,
The data selection circuit 33 outputs pulses Q^, QB, Qc, and Q as shown in FIG. , Qs are output. As a result, the switches 34 to 38 shown in FIG. 2A are controlled to open and close to obtain the brake voltage as shown in FIG. 6. This voltage is applied to the electromagnetic brake 28 via the amplifier 48, and the speed of the wire is controlled as shown in FIG. 4 in accordance with the fluctuation in the wire tension shown in FIG. This prevents tension fluctuations in the wire wound around the winding frame due to periodic changes in the supply speed of the wire. In the above-described embodiment, as means for detecting the rotational position of the winding frame attached to the rotational shaft, a disk is attached to the rotational shaft, a plurality of holes are formed in it to detect the rotational position, and the rotational position is detected by a photo sensor. Although the case has been shown, the object to be detected is not limited to a hole, and it is easy to imagine another embodiment in which, for example, a magnet or the like is attached to obtain a switch signal.

As is clear from the above-mentioned embodiments, according to the present invention, it is possible to control the tension of the coil-forming electric wire to an appropriate strength according to the shape of the coil winding frame, so that the magnitude of the tension applied to the electric wire can be controlled. During coil formation, the coils can be kept almost constant at all times, and the coil can be formed in a stable alignment state.

Further, it is possible to prevent accidents such as changes in resistance value per unit length and peeling of double-covered insulating material.

[Brief explanation of the drawing]

Figure 1 is a diagram of the wire tension control mechanism in a conventional winding machine.
FIG. 2a is an overall configuration diagram showing one embodiment of the tension control device according to the present invention, and a part thereof is shown in cross section. Figure 2b is a side view of a part of it, Figure 3 is a diagram showing how the tension applied to the wire changes when the winding frame shown in Figure 2 is rotated, and Figure 4 shows the change in tension shown in Figure 3. Figure 5 shows how the braking force changes when the wire supply speed is controlled accordingly; Figure 6 shows how the brake voltage changes.
FIG. 7, which shows the lowered state, is a time chart for explaining the operation of the wire tension control device shown in FIG. 2. 2
0... Rotating shaft, 21... Winding frame, 22... Disc, 23...
Detector, 24...Shift register, 25...Reel, 2
6... Electric wire, 27... Brake reel, 28.
...- Electromagnetic brake, 29... Pretension device, 30... Guide reel, 31... Roller, 32
... Coil " 33 ... Data selection circuit, 34
~38...switch, 40...control circuit, turtle turtle~45...
...Variable resistance, 46, 47...Resistance. 48...Amplifier, 50...Pin, 51...Wrap arm shaft, S2...Mounting hole, 53a, 53b...Golden oath, 54...・Notch, 55... Nut "A, B, C, ~L..."
Position detection hole. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 ? figure

Claims (1)

[Claims] 1. A non-circular winding frame is attached to the rotating shaft of a coil winding machine, and an electric wire for winding is supplied with a certain tension to the winding frame via a guide reel, and the electric wire is aligned with the winding frame. A tension control device for a wire in a winding machine that winds a wire to form a coil, the wire comprising a plurality of detection targets so as to detect the rotational position of the winding frame attached to the rotating shaft at a plurality of positions. a detection plate, a detector for the detection target, and an alignment device for aligning the detection plate and the winding frame in the rotational direction;
The brake reel includes a pretension device that applies a predetermined tension to a supply wire for forming a coil on the winding frame, and an electromagnetic brake that applies appropriate tension to the electric wire in accordance with the rotational position of the winding frame; Wire tension in a winding machine characterized by comprising a control circuit that can set a plurality of brake voltages to be supplied to the electromagnetic brake, and sequentially applies the plurality of set brake voltages to the electromagnetic brake according to a signal from the detector. Control device.