JPH05242570A - Device for fixing guide roller - Google Patents

Abstract

(57) [Summary] [Structure] A screw mechanism for attaching a guide roller for guiding a magnetic tape to an attachment body such as a base is provided with an elastic body having vibration damping and fixing action. [Effect] Vibration from the outside is damped by the elastic body, vibration transmitted to the magnetic tape is reduced, and the screen jitter value is improved.
Moreover, the guide roller shaft is fixed to the base or the like by the elastic body, so that the conventional set screw can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide roller mounting device for mounting a guide roller for guiding a magnetic tape to a mounting body such as a base, and for example, a guide roller for a magnetic recording / reproducing apparatus using a magnetic tape such as a video tape recorder. The present invention relates to a guide roller mounting device suitable for use in mounting.

[0002]

2. Description of the Related Art Conventionally, in a video tape recorder, for example, it has been very important to pull out a magnetic tape from a cassette, hold the magnetic tape at a predetermined position and height, and guide and run the magnetic tape. It is indispensable to adjust the height of a guide roller assembly including a guide roller and a guide roller shaft that rotatably supports the guide roller, and to attach the guide roller assembly.

FIGS. 3 and 4 show a typical embodiment of a conventional guide roller mounting device.

In FIGS. 3 and 4, the guide roller 1 is rotatably inserted into a guide roller shaft 2 and is fixed to both sides of the guide roller shaft 2 by an upper flange 3 and a lower flange 4 which are fixed by press-fitting. It is rotatably and pivotally held on the shaft 2. The guide roller shaft 2 is vertically (guided) with respect to the base 6 by a screwing mechanism 8 formed by a screw portion 5 provided on the outer peripheral surface of the lower flange 4 and a screw portion 7 provided on the base 6. The height of the roller shaft 2 is adjustable in the longitudinal direction. After the height adjustment is completed, the guide roller shaft 2 mounted on the base 6 is fixed by tightening the set screw 10 screwed into the screw hole 9 provided in the base 6 so that the height adjustment position does not shift. To be done.

[0005]

In the conventional guide roller mounting apparatus as described above, the guide roller shaft rotatably pivoting the guide roller is directly fixed to the base, and the guide roller head is provided. Is a free end,
Vibration from the outside is directly transmitted from the guide roller to the magnetic tape, which worsens the screen jitter value in the video tape recorder.

When adjusting the height of the guide roller,
Before adjusting the height of the guide roller, the guide roller shaft is temporarily fixed to the base with a set screw, and after the height adjustment, final tightening is required, which is a double work.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a guide roller mounting device for mounting a guide roller for guiding a magnetic tape to a mounting body such as a base via a screwing mechanism. In this structure, the coupling mechanism is provided with an elastic body having a vibration damping and a fixing action.

[0008]

With the elastic body provided in the screwing mechanism, vibrations from the outside are dampened, and the screw portions of the screwing mechanism are pressed to fix the guide roller shaft to the base by its reaction force.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the guide roller mounting device of the present invention will be described below with reference to FIGS.

1 and 2, the guide roller 11
Is rotatably inserted in the guide roller shaft 12 and is rotatably and rotatably fixed to the guide roller shaft 12 by an upper flange 13 and a lower flange 14 which are press-fitted and fixed to both sides of the guide roller shaft 12. The guide roller shaft 12 includes a screw portion 15 provided on an outer peripheral surface of the lower flange 14 and a screw portion 17 provided on a base 16 for screwing mechanism 1.
8 is mounted on the base 16 so as to be vertically adjustable (longitudinal direction of the guide roller shaft 12).

In the screw portion 15 of the lower flange 14 forming the screwing mechanism 18, about three slits 19 or more (for example, at intervals of 120 °) are provided in the longitudinal direction of the screw portion 15.
And each slit 19 has an elastic body 2 made of nylon or the like.
0 is press-fitted. The lower flange 14 of the guide roller shaft 12 is fixed to the base 16 by the reaction force generated when the elastic body 20 that is press-fitted is screwed in, and the guide roller shaft 12 is fixed to the base 16.

In the above structure, when the height of the guide roller 11 is adjusted, the lower flange 14 is rotated in a predetermined direction against the reaction force of the elastic body 20 of the screwing mechanism 18, and is guided with respect to the base 16. The height of the guide roller 11 is adjusted by moving the roller shaft 12 in the vertical direction.

After the height adjustment is completed, the lower flange 14 is fixed to the base 16 by the reaction force of the elastic body 20 of the screwing mechanism 18, and the guide roller shaft 12 is fixed at the adjusted position.

[0014]

Since the guide roller mounting device of the present invention is constructed as described above, the vibration from the outside is attenuated by the elastic body, the vibration transmitted to the magnetic tape is reduced, and the screen jitter value is improved. Since the guide roller shaft is fixed to the base or the like by the body, the conventional set screw can be eliminated, and the temporary work and the final tightening can be eliminated twice.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of a guide roller attaching device of the present invention.

FIG. 2 is an enlarged sectional view of a main part of a portion A in FIG.

FIG. 3 is a cross-sectional view of essential parts showing an embodiment of a conventional guide roller attaching device.

FIG. 4 is an enlarged cross-sectional view of a main part of a B portion of FIG.

[Explanation of symbols]

 11 Guide Roller 12 Guide Roller Shaft 16 Base 18 Screwing Mechanism 20 Slit

Claims (1)

[Claims] 1. A guide roller mounting device for mounting a guide roller for guiding a magnetic tape to a mounting body such as a base via a screwing mechanism, wherein the screwing mechanism includes an elastic body having vibration damping and fixing action. Guide roller mounting device characterized by.