JP2002252135A - Tension mechanism for automatic winding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of many work steps for adjusting arm tension being required and a setting errors are apt to occur. SOLUTION: This tension mechanism is provided with an arm 6, whose one end is fixed to a freely rotatable holder 5 and a spring 8 fitted between a support bar 4 and the holder 5. The holder 5 is given a rotary force by elasticity of the spring 8, and an arm tension is given to a wire at the tip end of the arm 6 rotating together with the holder 5. In this tension mechanism for automatic winding machine, a support bar 4 is formed freely movably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension mechanism provided in an automatic winding machine for applying a predetermined tension to a wire.

[0002]

2. Description of the Related Art Automatic winding machines are used to wind wires around electronic components such as coils and delay lines. The automatic winding machine performs a winding process by rotating a bobbin of a coil or rotating a guide nozzle around a terminal while holding a wire fed from a winding frame by a guide nozzle or the like. In order to accurately wind a wire around a bobbin or a terminal, it is necessary to apply a tension to the wire in accordance with its operation.

There are two types of tension applied to wires. There is a back tension for always providing a pull resistance to the wire to be pulled out, and a second tension for removing slack if necessary. Usually, these two types of tensions are used in combination. FIG. 3 shows such a conventional tension mechanism.

A support plate 2 fixed to a base 1 holds both ends of a fixed shaft 3 and a support rod 4 which are parallel to each other. One end of an arm 6 is fixed to a holder 5 rotatably attached to the fixed shaft 3. The arm 6 is formed of a flexible elastic material, and a guide roller 7 is attached to a tip thereof. A spring 8 is attached between the support rod 4 and each holder 5. The spring 8 applies a rotational force to the holder 5 in the direction of lifting the tip of the arm 6. The second tension is applied to the wire 10 by this rotational force.
Hereinafter, this second tension is referred to as an arm tension.

The wire 10 unwound from the bobbin 9 is connected to a substrate
After being wound once around the groove of the rotatable pulley 12 through the hole 11a, it is pulled out below the holder 5 and through the groove of the guide roller 7. When the tip of the wire 10 is pulled, the pulley 12 is turned by the wound wire 10. At this time, pulling resistance, that is, back tension acts on the wire 10 due to the rotational friction of the pulley 12. The details of the tension mechanism using the pulley 12 are disclosed in JP-A-9-260174.

Although not shown, the wire 10 pulled out through the guide roller 7 further passes through the hole of the cylindrical guide nozzle, and is held with its tip end clamped by a clamper or the like. The bar 13 crossing under the arm 6 prevents the arm tension from acting after the wire 10 is wound around the terminal. bar
13 pushes up the arm 6 as necessary to fix the fixed shaft 3
The rotation of the arm 6 about the center is prevented, and only the back tension is applied to the wire 10. In addition, base 1
And the substrate 11 are connected via a member (not shown) and fixed to each other.

[0007]

When the wire 10 is replaced with a wire having a different wire diameter due to a change in the type of winding component, it is necessary to reset the strength of the tension to a value suitable for the wire diameter of the wire 10. Conventionally, the adjustment of the arm tension has been performed by a method such as replacing the spring 8. FIG. 3 shows a configuration example of two stations for the sake of convenience. For this reason, there has been a problem that replacement of the spring 8 requires a large number of work steps and a setting error easily occurs. Therefore, the present invention has a configuration in which the strength of the arm tension can be easily set in a short time.

[0008]

According to the present invention, a holder 5 rotatably mounted on a fixed shaft 3 and one end of the holder 5 are provided.
And an elastic arm 6 fixed to the holder 5 and a spring 8 mounted between the support rod 4 parallel to the fixed shaft 3 and the holder 5.
In a tension mechanism of an automatic winding machine that applies a rotational force to the arm and applies an arm tension to the wire at the tip of an arm 6 that rotates together with the holder 5, the support rod 4 is configured to be movable, and the support rod 4 and the fixed shaft 3 The strength of the arm tension is adjusted by changing the distance between the arms. Further, the present invention is characterized in that such a tension mechanism is provided with support rod driving means such as the air cylinder 15 and the ball screw 30 so that the distance between the fixed shaft and the support rod can be changed to a predetermined value.

[0009]

FIG. 1 shows an embodiment of a tension mechanism according to the present invention. Note that portions corresponding to the above-described conventional example are denoted by the same reference numerals in the following embodiments and will be described. This embodiment is different from the above-described conventional example in a state where the support rod 4 for supporting one end of the spring 8 is attached to the support plate 2. Conventionally, the support rod 4 is fixed to the support plate 2 and the base 1, but in this embodiment, the support rod 4 is configured to be movable in the vertical direction.

The strength of the arm tension is adjusted by moving the support bar 4 up and down in the direction of the arrow while maintaining the parallelism with the fixed shaft 3. That is, when it is desired to increase the arm tension, the tension of the spring 8 is increased by raising the support rod 4, and when it is desired to decrease the tension, the tension of the spring 8 is relaxed. The winding operation is performed with the support rod 4 stopped at a position where a desired arm tension can be obtained. FIG. 1 shows the vertical movement of the support rod 4 using an air cylinder 15.
This is an example of the configuration in the case where the piston 15a is moved up and down.

FIG. 2 shows another embodiment of the drive mechanism of the support rod 4. As shown in FIG. This uses one motor 20 and two ball screws 30 in place of the air cylinder, and is also a double-type configuration. Although parts other than the drive mechanism of the support rod 4 are omitted in FIG. 2, even when this drive mechanism is used, the same fixed shaft 3, holder 5, arm 6, spring 8, etc. as in FIG. 1 are provided. The ball screw 30 has a rod-shaped screw shaft 31 having a helical screw groove formed on the surface thereof and the screw shaft 31.
And a movable nut 32 screwed into the nut. The screw shaft 31 of each ball screw 30 is rotatably held about a longitudinal axis by two support portions 2a fixed to the support plate 2.

In the figure, the lower end of the screw shaft 31 is coupled to the rotation shaft of the motor 20 via the coupling member 22, and is driven by the motor 20 to rotate. Screw axis of left ball screw 30
The rotation of 31 is performed by the timing pulley 23 and the timing belt 24
To the screw shaft 31 of the ball screw 30 on the right. Therefore, when the left screw shaft 31 rotates, the right screw shaft 31 also rotates at the same speed in the same direction.

A movable nut 32 is screwed onto each screw shaft 31, and both ends of the support rod 4 are
Fixed to 32. When the two screw shafts 31 rotate, the movable nut 32 moves together with the support rod 4 in an upward or downward direction as indicated by an arrow according to the rotation direction of the screw shaft 31. Motor 20
The position of the support rod 4 can be accurately controlled by using a servomotor or the like. Therefore, an arbitrary arm tension can be obtained by attaching one end of the spring 8 to the support rod 4 of FIG. 2 as in FIG.

In actual use of the tension mechanism of the present invention, for example, the wire diameter of the wire to be used is recognized from the part number of the winding part, and the position data of the support rod 4 corresponding to the wire diameter is instructed to the motor 20. Such a program may be incorporated in the control unit of the automatic winding machine. This program automatically adjusts the distance between the fixed shaft 3 and the support rod 4 to an optimum value according to each operation of the winding process. This makes it possible to automatically adjust the arm tension value in synchronization with each operation at the time of winding of the automatic winding machine, simply by inputting the part number of the winding component.

[0015]

According to the present invention, the change of the tension value when the kind of the winding component changes can be handled by the program of the control device attached to the automatic winding machine, and the automatic control becomes possible. The arm tension at the time of winding the wire around the terminal is preferably about half the strength at the time of winding the bobbin, but such a partial change in the tension value during one winding process can be performed instantaneously. Since a tension of a strength suitable for the winding operation at that time is always applied to the wire, it is effective in improving the quality of the winding part.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing a main part of a second embodiment of the present invention.

FIG. 3 is a perspective view showing a schematic configuration of a conventional tension mechanism.

[Explanation of symbols]

 3 Fixed shaft 4 Support rod 5 Holder 6 Arm 8 Spring

Claims (3)

[Claims] 1. A holder rotatably mounted on a fixed shaft, an elastic arm having one end fixed to the holder, a spring mounted between a support bar parallel to the shaft and the holder. In a tension mechanism of an automatic winding machine that applies a rotational force to a holder by elasticity of the spring and applies an arm tension to a wire at an end of an arm that rotates together with the holder, a supporting rod is configured to be movable, and A tension mechanism for an automatic winding machine, wherein the tension of an arm is adjusted by changing a distance between a rod and a fixed shaft. 2. A tension mechanism for an automatic winding machine according to claim 1, further comprising a driving means for the support rod, wherein a distance between the fixed shaft and the support rod can be changed to a predetermined value. 3. The driving means for the support rod comprises at least two screw shafts each having a helical thread groove on the surface and rotatable about a longitudinal axis, and a movable nut screwed onto the screw shaft. 3. A ball screw and a motor for rotating the screw shaft, wherein a support rod is fixed between the two movable nuts.
Automatic winding machine tension mechanism.