JPH10222900A - Tape tension controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust braking force on reel base by means of a brake band with a small number of parts by fixing both end parts of the brak band for braking the reel base to a single band holder. SOLUTION: The device is equipped with a tension arm 5 energized by a spring 8 and having a post 15 to be in contact with a tape 14, the brake band 1 for braking the reel base 6 on the side of supplying the tape 14 and the band holder 11 fixed with both end parts of the band 1 and fitted to the tension arm 5, and the tension arm 5 is turned against the aforesaid energization in response to the tension of the tape 14 to control braking the reel base 6 by the brake band 1, so that the tension of the tape 14 to be supplied is controlled to become constant. The single band holder 11 is tightly turnably fitted via a force-fitting boss 12 to the tension arm 5, and braking force of the reel base 6 by the brake band 1 is adjusted by turning the holder 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape tension control device used for a tape recorder, a VTR, and the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a tension arm 5 having a portion composed of a post 15 which is urged by an elastic member composed of a spring 8 and comes into contact with a tape 14, as shown in FIG. A brake band 1 for braking the reel base 6 on the side supplying the tape 14, one end and the other end of the band 1 being fixed to each other, and separate band holders 2 attached to the tension arm 5;
a, 2b, and the tension arm 5 is provided with a shaft 7 against the elasticity of the spring 8 in accordance with the tension of the tape 14.
, And the rotation controls the braking of the reel base 6 by the brake band 1, whereby the tension of the supplied tape 14 is controlled to be constant. Is known.

[0003] In such a tape tension control device, braking of the reel base 6 is controlled by frictional resistance generated by tightening by the brake band 1. Frictional resistance is not uniform, and the original tape tension cannot be maintained. Therefore, the tightening force by the brake band 1 is adjusted,
A mechanism for obtaining a stable tape tension is required.

In FIG. 2, the band holder 2
a is attached to the tension arm 5 so as to be rotatable about a shaft 4, and the band holder 2b is attached to a synthetic resin shaft 3 so as to be rotatable. The shaft 3 is encircled in FIG. As shown, the eccentric portion 16 is press-fitted into the tension arm 5. The shaft 3
Can be rotated tightly with respect to the tension arm 5. The shaft 3 has a groove 17 into which the tip of the driver is fitted. This groove 17
By rotating the shaft 3 with respect to the tension arm 5, the braking force of the brake band 1 on the reel base 6 is adjusted.

[0005]

However, the above-described conventional tape tension control device requires two band holders 2a and 2b, and thus has a problem that the number of parts is large and the number of mounting steps is large. . The present invention
In view of the above, it is an object of the present invention to provide a tape tension control device that can adjust the braking force of the brake band 1 on the reel base 6 despite the small number of components.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and achieve the above object, a tape tension control device according to the present invention is provided with a tension arm having a portion urged by an elastic member and brought into contact with the tape. And a brake band for braking the reel stand on the side where the tape is wound or supplied, and one end and the other end of the band are fixed,
A band holder attached to the tension arm, wherein the tension arm is moved against the elasticity of the elastic member in accordance with the tension of the tape, and the movement controls the braking of the reel base by the brake band. In the tape tension control device in which the tension of the wound or supplied tape is controlled so as to be constant, the single band holder is pivotally rotated on the tension arm via the press-fit boss. The brake band is attached so as to be capable of adjusting the braking force of the reel base by the brake band.

[0007]

In the tape tension control device of the present invention configured as described above, the brake band is attached to the tension arm by a single band holder, and the braking force of the brake band on the reel base can be adjusted. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a VTR will be described below with reference to FIG. Figure 1 shows a VTR
2 shows the vicinity of the tension arm and the reel base on the supply side, and the same reference numerals as those in FIG. In FIG. 1, reference numeral 13 denotes a rotation shaft of the tension arm 5, and reference numeral 11 denotes a band holder. This band holder 11
Has one end and the other end of the brake band 1 with the holding portion 9,
It is fixed at 10. As the fixing means, conventionally known welding, press fitting, hooks and the like can be used. A press-fit boss 12 made of synthetic resin is integrally fixed to the band holder 11, and this boss 12 is press-fitted into a hole (not shown) of the tension arm 5 made of metal, and is attached so as to be able to rotate tightly. I have. The mutual positions of the boss 12, the holding portions 9 and 10, the tension arm 5 and the reel base 6 are determined according to the direction of rotation when the band holder 11 is rotated about the boss 12. The brake band 1 is selected so that the braking force of the reel base 6 by the brake band 1 is increased / decreased.

In the case shown in FIG. 1, when the tension arm 5 rotates around the shaft 13 to maintain the tape tension, the band holder 11 is rotated clockwise about the boss 12. Accordingly, the holding portions 9 and 10 of the brake band 1 approach the center of the rotation axis of the reel base 6, the brake band 1 is loosened, and the tension braking force is weakened. The band holder 11 is centered on the boss 12.
Is rotated counterclockwise, the holding portions 9 and 10 of the brake band 1 are separated from the center of the rotation axis of the reel base 6, the brake band 1 is tightened, and the tension braking force is increased. By these actions, a stable tension braking force can be obtained. Further, when the tension arm 5 rotates counterclockwise and a tension brake is applied, tension is generated in the brake band 1 and a force acts in a direction of pulling and rotating the boss 12. The above-described press input to the boss 12
Is stronger than the above force.

In the tape tension control device configured as described above, the braking force of the brake band 1 on the reel base 6 is adjusted by rotating the boss 12 as described above. In the above-described embodiment, the brake on the supply-side reel base is described. However, the reel-side reel base can be implemented in substantially the same manner.

[0011]

As described above, the tape tension control device according to the present invention includes a tension arm 5 having a portion such as a post 15 which is urged by an elastic member such as a spring 8 and is brought into contact with a tape 14; A brake band 1 for braking the reel base 6 on the side where the tape 14 is wound or supplied is fixed to one end and the other end of the band 1.
A band holder 11 attached to the tension arm 5, and the tension arm 5 is moved like a rotation against the elasticity of the elastic member in accordance with the tension of the tape 14, and the movement causes the brake In the tape tension control device, the braking of the reel base 6 by the band 1 is controlled, whereby the tension of the wound or supplied tape 14 is controlled to be constant.

A single band holder 11 is attached to the tension arm 5 via a press-fit boss 12 so as to be rotatable tightly, and the rotation causes the brake band 1 to brake the reel base 6 as described above. Since the force is adjusted, it is possible to provide a tape tension control device capable of adjusting the braking force of the brake band 1 on the reel base 6 with a small number of parts.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brake band 1 2a, 2b Band holder 3, 4, 7 axis 5 Tension arm 6 Reel stand 8 Spring 9, 10 Holding part 11 Band holder 12 Press-fit boss 13 Rotating shaft 14 Tape 15 Post 16 Site 17 Concave groove

Claims (1)

[Claims] 1. A tension arm urged by an elastic member and having a portion that comes into contact with a tape, a brake band that brakes a reel stand on a side where the tape is wound or supplied, and one end of the band. And a band holder fixed to the other end and attached to the tension arm, wherein the tension arm is moved against the elasticity of the elastic member in accordance with the tension of the tape, and the movement is caused by the brake band. In the tape tension control device in which the braking of the reel base is controlled, whereby the tension of the wound or supplied tape is controlled to be constant, the tension arm includes the single band holder. The brake van is attached rotatably tightly via a press-fit boss, and this rotation causes Tape tension control device, characterized in that the braking force of the reel table is configured to be adjusted by.