JP3036658B2 - Tape supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape supply device for mounting a tape pad and supplying the tape to a process of winding a tape around an object.

[0002]

2. Description of the Related Art A tape winding device is used for insulating a cable and forming a presser winding. There is also a method in which a molding resin is tape-wound at a connection portion of a cable, and the resin is crosslinked by heating and molded. A mechanism for supplying a tape with a constant tension is required for a tape supply device used in such a tape winding device. This is because if the tension during the winding of the tape fluctuates, it may cause collapse or wrinkles. FIG. 6 is a diagram for explaining the operation principle of the tape supply device. As shown, the tape 1 is wound around an axis 2 to form a tape pad 3. When such a tape 1 is pulled out with a force F in the direction of arrow 4, a reverse torque is applied to the tape pad 3 in the direction of arrow 5 to balance the tape. This applies a constant tension to the tape. In this case, the reverse torque is T [Kg · m], and the winding diameter of the tape pad 3 is R.
[M] and the take-off force is F, T is expressed by the product of F and R.

FIG. 7 is a graph showing the relationship between the reverse torque T and the winding diameter R of the tape pad. As shown in the drawing, when the winding diameter R of the tape pad increases, the reverse torque T increases in proportion to the winding diameter R. That is, when applying a braking force to the tape pad in order to apply a tension to the tape 1, if a constant braking force is always applied to the shaft 2 of the tape pad 3, it is necessary to apply a constant tension to the tape 1. Can not. If the winding diameter R of the tape pad 3 gradually decreases as the tape 1 is supplied, the reverse torque T applied to the shaft 3 must also be reduced in proportion to the winding diameter R. To this end, a tape supply device that detects the winding diameter of the tape pad 3 and adjusts the braking force on the shaft has already been developed (Japanese Utility Model Publication No. Sho 61-11648).

[0004]

By the way, the brake unit of the above-mentioned conventional tape supply device has the following structure. FIG. 8 is a plan view showing the configuration of a conventional brake unit. In the drawing, a brake drum 6 is fixed to a tape supply shaft on which a tape pad 3 is mounted. A brake shoe 7 is pressed against the brake drum 6 to apply a constant braking force. Assuming that the shaft torque applied to the tape supply by this braking force is Td, the relationship between the braking force P and the shaft torque Td is as follows.

FIG. 9 is a graph showing the relationship between the shaft torque and the braking force. In the graph, the axis of ordinate represents the shaft torque Td as [Kg · m], and the axis of abscissa represents the braking force Pd.
[Kg]. That is, the brake shoe 7
Is pressed against the brake drum 6 with a braking force P, a force corresponding to the product of the braking force P and the friction coefficient μ is applied to the brake drum 6 in the tangential direction. Assuming that the radius of the brake drum 6 is r, a value obtained by dividing the shaft torque Td by this r is equal to the braking force P × μ. The graph shows a relational expression obtained for the braking force P.

The above braking force is adjusted according to the tape diameter under the conditions as shown in FIG.
It is not always easy to link them faithfully. In addition, such an interlocking mechanism becomes impractical if it becomes too complicated, resulting in high equipment costs. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a tape supply device that can accurately interlock with a tape winding diameter and stabilize the tension applied to the tape by applying a necessary braking force. The purpose is to do so.

[0007]

According to the present invention, there is provided a tape supply device for supplying a tape while rotating a tape pad.
Tape supply and the tip touches the outer peripheral surface of the tape pad.
The tape pad is wound by supplying the tape.
A winding diameter detection arm that rotates following the decrease in
Brake brake for braking the rotation of the tape supply
And a brake shoe pressed against the brake drum
The brake shoe is pivotally disposed, and the brake shoe
A pressing lever for applying a pressing force according to
A first gear that rotates following the rotation of the diameter detection arm;
The pressing lever is rotated following the rotation of the first gear,
And a second gear for rotating .

[0008]

This tape supply device is provided with a winding diameter detecting arm for tracing the outer peripheral surface thereof so as to detect a decrease in the winding diameter of the tape pad. Winding diameter detection arm is wound
When rotating following the decrease in diameter, the first gear rotates.
You. When the first gear rotates, the second gear has a certain ratio
To rotate the pressing lever. The pressing lever is braked via a coil spring or the like according to the amount of rotation.
The pressing force applied to the shoe is reduced. In other words, if the winding diameter of the tape pad decreases, the brake shoe will be pushed.
The force is reduced. Therefore, the gear ratio of the first and second gears
, The tape is always fed out at a constant tension.
Can be

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a plan view showing an embodiment of the tape supply device of the present invention. In the drawing, the tape supply device includes a tape supply 10 on which a tape pad 3 is mounted and supplies the tape 1, a winding diameter detection arm 11 which comes into contact with the outer peripheral surface of the tape pad 3 and detects the winding diameter, An interlocking mechanism 20 that adjusts a braking force in conjunction with the winding diameter detection arm 11 and a brake unit 30 that applies a constant braking force to the tape pad 3. Tape pad 3
Rotates about the shaft 2 on the tape supply 10 to supply the tape 1. A brake drum 6 is attached to the shaft 2, and a brake force is applied by pressing a brake shoe 7 against the brake drum 6. The configuration of this part is not different from the conventional tape supply device.

Here, the tape supply device of the present invention is provided with a winding diameter detecting arm 11 for detecting the winding diameter of the tape pad which comes into contact with the outer peripheral surface of the tape pad 3 and changes with the supply of the tape 1. Have been. The winding diameter detection arm 11 is configured to rotate around a shaft 12 in a direction indicated by an arrow 14. A tress roller 13 is attached to the tip of the winding diameter detection arm 11, and the tress roller 13 circumscribes the outer peripheral surface of the tape pad 3 and detects the winding diameter so as not to hinder the rotation of the tape pad 3. It has a configuration.

A gear 2 is mounted on a shaft 12 of the winding diameter detecting arm 11.
1A is fixed, and is configured to rotate in the direction of arrow 22 when the winding diameter detection arm 11 rotates in the direction of arrow 14. The gear 21A is the other large-diameter gear 2
It is in mesh with 1B. A pressing lever 25 is attached to a shaft 24 of the gear 21 </ b> B, and is configured to rotate in a direction indicated by an arrow 26 opposite to the movement of the winding diameter detection arm 11. On the other hand, the brake shoe 7 is attached to one end of a pressing shaft 31, and the pressing shaft 31 is inserted through a guide fitting 32 and further inserted through an elongated hole of the pressing lever 25 .

FIG. 2 shows a side view of FIG. 1 in order to clarify the structure of the brake unit 30. FIG.
As shown in FIG. 5, the pressing lever 25 is provided with a long hole 25A, through which the tip of the pressing shaft 31 is inserted.
The guide fitting 32 is fixed to the lower surface of a mounting plate 40 for fixing the tape supply device. Therefore,
The pressing shaft 31 is supported by the guide fitting 32 so as to freely slide in the longitudinal direction.

When the pressing shaft 31 is pressed in the direction of the brake shoe 7, the brake shoe 7 is pressed against the brake drum 6, and a braking force is applied to the tape pad 3 more strongly. In order to apply such a braking force, a coil spring 34 is fitted into the pressing shaft 31, and the coil spring 34 and the pressing lever 25
A washer 33 (shown in FIG. 1) is sandwiched between them, and a nut 35 is arranged on the opposite side of the coil spring 34 and fixed to the pressing shaft 31. As shown in FIG. 1, the side of the washer 33 that contacts the pressing lever 25 has a spherical surface, and the movement of the pressing lever 25 is smoothly transmitted to the coil spring 34.

The tape supply device of the present invention having the above configuration operates as follows. First, as shown in FIG. 1, when the tress roller 13 of the winding diameter detection arm 11 circumscribing the tape pad 3 moves in the direction of the arrow 14, the gear 21A fixed to the shaft 12 of the winding diameter detection arm 11 Arrow 22
Rotate in the direction. As a result, the gear 21B meshing with the gear 21A rotates in the direction of the arrow 23. As a result, the pressing lever 25 rotates in the direction of the arrow 26.

The coil spring 34 fitted on the pressing shaft 31 is compressed by the pressing lever 25 in advance, and when the pressing lever 25 rotates in the direction of the arrow 26,
Extend that length. The coil spring 34 moves the pressing shaft 31 via the nut 35 with the arrow 36 due to its elasticity.
Pushing in the direction. This pressing force is transmitted to the brake drum 6 via the brake shoe 7. Therefore, the pressing lever 2
The swing of the coil spring 34 in the direction of arrow 26 of FIG.
Is extended, the brake drum 6 of the brake shoe 7
And the braking force is reduced.

FIG. 3 shows a winding diameter detecting arm 1 as described above.
An explanatory view showing the relationship between the rotation angle of No. 1 and the rotation angle of the pressing lever 25 is illustrated. In the figure, θ1 is the tress roller 13
3 shows the rotation angle of the winding diameter detection arm 11 accompanying the movement of the arm. Θ2 is the pressing lever 25 transmitted by the rotation of the gear.
Shows the rotation angle of. The pressing lever 25 presses the washer 33 to compress the coil spring. As shown, when the numbers of teeth of the gears 21A and 21B shown in FIG. 1 are NA and NB, respectively, the relationship between θ1 and θ2 is as shown in FIG. That is, θ2 and θ1 are proportional to the number of teeth NA and NB.

FIG. 4 shows the relationship between the winding diameter of the tape and the rotation angles of the winding diameter detecting arm 11 and the pressing lever 25 as described above. The vertical axis in the figure indicates the winding diameter of the tape pad, and the horizontal axis indicates the rotation angle. As can be seen from FIGS. 3 and 4, in the tape supply device of the present invention, when the winding diameter detection arm 11 rotates by θ1 in accordance with the change in the winding diameter of the tape pad, the pressing lever 25 moves to the rotation angle. Rotate in proportion to θ2. Strictly speaking, the change in the rotation angle of the winding diameter detection arm 11 is not linear with respect to the winding diameter. However, if the length of the winding diameter detection arm 11 is made sufficiently long, the winding diameter of the tape pad and its rotation angle may be regarded as substantially proportional as shown in FIG. Therefore, in the apparatus as shown in FIG. 1, the length of the coil spring 34 pressing the brake shoe 7 can be changed linearly in proportion to the change in the winding diameter of the tape pad.

FIG. 5 is a graph showing the relationship between the total length of the coil spring 34 and the rotation angle θ2 of the pressing lever 25. The vertical axis in the figure indicates the total length of the coil spring, and the horizontal axis indicates the rotation angle of the pressing lever 25. As shown in the drawing, the total length of the coil spring increases proportionally as shown in the figure until the rotation angle of the pressing lever 25 is changed from the minimum to the maximum. When the length of the coil spring is reduced, the braking force increases, and when the length is increased, the braking force decreases. If the length of the coil spring is proportionally increased and decreased between the case where the tape diameter is the largest and the case where the tape diameter is the smallest, the braking force of the tape pad is just proportionally increased and decreased. This characteristic may be made to match the characteristic shown in FIG. 7 that can apply a constant tension to the tape.

In the apparatus of the present invention, the braking force by the coil spring 34 when the winding diameter of the tape pad is minimum can be adjusted by the position of the nut 35 shown in FIG. Further, the coil spring 34 gradually expands according to the winding diameter of the tape pad, and the expansion rate can be selected by the ratio of the number of teeth of the pair of gears 21A and 21B provided on the interlocking mechanism 20. Therefore, if these conditions are properly selected,
It is possible to give the tape pad 3 a condition for accurately keeping the tension of the tape constant.

The present invention is not limited to the above embodiment. The winding diameter detection arm 11 of the above embodiment need not necessarily have a tress roller at its tip, and may have a mechanism in which the tip of the arm directly contacts the outer peripheral surface of the tape pad 3. Also, the gears 21A, 21B constituting the interlocking mechanism 20
May be configured to be linked by a belt, for example. In addition, the pressing lever 25 is connected to the coil spring 3
As for the configuration for compressing the tape 4, any configuration may be used as long as the configuration allows the compression length to be changed as closely as possible to the winding diameter of the tape pad.

[0021]

The tape supply device of the present invention described above contacts the outer peripheral surface of the tape pad and presses the brake shoe against the winding drum for detecting the winding diameter of the tape pad and the brake drum of the tape supply. A tape portion that applies a braking force to the brake pad, and first and second gears that reduce the force for pressing the brake shoe in accordance with the rotation angle of the shaft of the winding diameter detection arm as the winding diameter decreases. The brake force can be accurately increased or decreased according to the change in the winding diameter of the tape to stabilize the tension when the tape is pulled out. In addition, the mechanism is relatively simple, the equipment cost can be reduced, and stable control can be performed with few failures.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a tape supply device of the present invention.

FIG. 2 is a side view of the tape supply device of FIG.

FIG. 3 is an explanatory diagram illustrating the operation of the tape supply device of the present invention.

FIG. 4 is a graph showing a relationship between a winding diameter of a tape pad and a rotation angle of a winding diameter detection arm or a pressing lever of the apparatus of the present invention.

FIG. 5 is a graph showing the relationship between the total length of a coil spring and the rotation angle of a pressing lever of the device of the present invention.

FIG. 6 is a diagram illustrating the operation principle of a general tape supply device.

FIG. 7 is a graph showing a relationship between a winding diameter of a tape pad and a reverse torque.

FIG. 8 is a plan view showing a configuration of a brake drum and a brake shoe.

FIG. 9 is a graph illustrating the relationship between the shaft torque and the braking force for explaining the operation principle of the brake shoe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tape 3 Tape pad 6 Brake drum 7 Brake shoe 10 Tape supply 11 Winding diameter detection arm 20 Interlocking mechanism 25 Press lever 30 Brake part

Claims (1)

(57) [Claims] 1. A tape is rotated while rotating a tape pad.
A tape supply to be supplied, and a leading end abutting on an outer peripheral surface of the tape pad;
Following the reduction of the tape pad winding diameter due to the supply of tape
A winding diameter detecting arm that rotates by rotating the tape supply;
Ram and a brake system pressed against the brake drum
The brake shoe is arranged to be rotatable, and the brake shoe
And a first lever that rotates following the rotation of the winding diameter detection arm.
A gear, and the pressing lever that rotates following the rotation of the first gear;
And a second gear for rotating the gear.
Loop feeder.