JPS6336519Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a guide roller that guides a conveyed strip, such as a magnetic tape, around the video head of a video tape recorder.

In a video tape recorder, one or more guide rollers are provided around the video head to guide a magnetic tape to be played back or recorded to the video head or to a cassette.

Unlike drive rollers such as pinch rollers, this guide roller is a roller that simply guides the transport of the magnetic tape, but its rotational state affects the image, so it is required to have high rotational accuracy. be done.

Therefore, a guide roller has been proposed in which a rotation support surface is formed inside the roller member and a ball is installed between the rotation support surface and the support shaft. This product is superior in that it has high rotation accuracy and can maintain a stable rotation state for a long period of time, but it is difficult to manufacture because the rotation support surface is formed or set at a desired position inside the roller. There are drawbacks.

Therefore, this invention provides a guide roller that has a simple structure, allows the rotary support part to be set at a desired position, and allows the position to be adjusted, and allows smooth transport of a band-shaped object such as a magnetic tape over a long period of time. With the goal.

That is, in the guide roller of this invention, the upper flange is fixed to the threaded part formed at the end of the support shaft, and the first rotary support ring is installed, and the lower flange is fixed to the support shaft, and the second rotary support ring is installed. first and second rotation support parts, each having a rotation support ring having a smaller diameter than the lower flange part and having a rotation support surface formed of an inclined surface at a position spaced apart in the axial direction inside the cylindrical roller; A spring is installed between these rotation support parts to bias the rotation support parts in the direction of separating them, and a spring is installed between the rotation support parts, and a spring is installed between the rotation support parts, and a spring is installed between the rotation support parts, and the rotation support surface and the support shaft of the first rotation support ring, the annular first rotation support part are A plurality of balls are installed in each of the spaces formed by this, and the space formed by the second rotation support ring, the rotation support surface of the annular second rotation support part, and the support shaft. is rotatably supported.

Hereinafter, this invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of the guide roller of this invention. The support shaft 2 is erected on a support frame in the periphery of a magnetic head such as a video tape recorder (not shown) with a press-fit portion 4 formed at its lower end.

A threaded portion 6 is formed at the upper end of this support shaft 2, and this threaded portion 6 has an upper flange portion 8 having a trapezoidal cross section.
is fixed, and a recess 10 is formed at the top of the upper flange 8 to insert and rotate an adjustment jig such as a screwdriver.

A screw 12 is installed inside the threaded part 6 of the upper flange part 8 to prevent loosening, and the threaded part 6 and the screw 1
The tops of 2 are in contact with each other.

A lower flange 14 is fixed above the press-fitted part 4 of the support shaft 2, facing the upper flange 8.
A threaded portion 15 for adjusting the mounting height of the guide roller is formed at the lower part of the guide roller.

First and second rotation support rings 16 and 18, which form rotation support surfaces, are attached to the opposing surfaces of the upper flange 8 and the lower flange 14, and the surrounding areas are protected from dust. Recesses 20 and 22 are formed to prevent this.

A cylindrical roller 24 is loosely fitted between the upper flange 8 and the lower flange 14, and a first annular body is provided on the inner surface of the roller 24 at a position spaced apart in the axial direction. and a second rotation support part 26,
28 is installed, and a spring 34 is installed between each rotation support part 26, 28 in order to bias them in a direction to separate them from each other.

The first and second rotation support portions 26 and 28 have an inclined surface such as a tapered surface or a curved surface.
0 is formed, and each rotation support part 26, 28 is installed with its rotation support surface 30 facing the open end side of the roller 24. And the rotation support surface 30,
A plurality of balls 32 are installed in each of the spaces formed by the rotation support rings 16 and 18 and the support shaft 2, and the support shaft 2 is
A roller 24 is rotatably supported thereon.

Further, small diameter portions 33 are formed at the upper and lower ends of the roller 24, and the small diameter portions 33 form the recesses 20,
22 to prevent dust from entering.

With this configuration, since the rotation support surface 30 is set by fitting the first and second rotation support parts 26 and 28 inside the roller 24, each rotation support part 26 and 28 can be attached to each rotation support part 26 and 28 with high precision. forming a rotation support surface 30;
When press-fitting each rotation support part 26, 28 into the inside of the roller 24, the fixing position thereof can be adjusted and the rotation support surface 30 can be installed at a desired position.

In addition, the rotation support surface 3 is directly inside the roller 24.
0, there is no difficulty in increasing the positional accuracy during machining, and it is possible to facilitate machining and improve the positional accuracy of the rotary support surface 30. In particular, even when the roller 24 is thin, the accuracy of the rotation support surface 30 can be improved.

Then, the first and second rotational supports 26, 28 are urged outward by the spring 34, and the rotating state can be made smoother by applying appropriate pressure. positional shift is prevented.

Therefore, since the rotating support surface 30 is set with high accuracy and its positional accuracy can be improved, a stable and smooth rotating state can be obtained, and the magnetic tape can be transferred smoothly.

Note that the rotation support parts 26 and 28 can also be fixed to the roller 2 by other means such as screws.

As explained above, according to this invention, the rotation support part is fixed to the roller and the position of the rotation support surface of the roller is set, so the structure is simple, the rotation support part can be adjusted to the desired position, and The position can be set with high precision, and each rotating support installed inside the roller is biased by a spring, and the spring applies appropriate pressure to the rotating support surface to absorb rotational wobble due to wear. By doing so, a stable rotational state can be obtained, and a belt-shaped object such as a magnetic tape can be transported smoothly over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the guide roller of this invention. 2...Support shaft, 6...Threaded portion, 8...Upper collar, 14...Lower collar, 16...First rotation support ring, 18...Second rotation support ring, 24...
...Roller, 26...First rotation support part, 28...
Second rotation support part, 30...Rotation support surface, 32...
...Ball, 34...Spring.

Claims (1)

[Scope of utility model registration request] A first rotary support ring is installed by fixing the upper flange to the threaded portion formed at the end of the support shaft, a second rotation support ring is installed by fixing the lower flange to the support shaft, and First and second rotational supports each having a rotational support surface formed with an inclined surface are installed at positions spaced apart in the axial direction inside the cylindrical roller and have a diameter smaller than that of the lower flange. a space formed by the first rotation support ring, the rotation support surface and the support shaft of the annular first rotation support part, and A guide roller that rotatably supports the roller by installing a plurality of balls in each of the spaces formed by the second rotation support ring, the rotation support surface of the annular second rotation support part, and the support shaft. .