JPS6336513Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a guide roller for guiding the continuous transport of a strip, such as the transport of a magnetic tape around the video head of a video tape recorder.

[Conventional technology]

In a video tape recorder, a guide roller is provided around the video head to guide a magnetic tape to be played back or recorded to the video head or to a cassette. This guide roller, unlike a drive roller such as a pinch roller, is simply for guiding the transport of the magnetic tape.

FIG. 1 shows a conventional guide roller. The support shaft 2 is vertically attached to the support frame 1 by fixing means such as press fitting.
is provided upright, and a threaded portion 3 formed at the tip of this support shaft 2 has a flange portion 4 having a trapezoidal cross section.
is installed. A recess 5 is formed at the top of the flange 4 into which a jig for attachment and detachment is inserted. Further, the opening of the flange 4 is filled with an adhesive 6 to prevent the flange 4 from loosening.

Radial bearings 7 and 8 are fixed to the middle part of the support shaft 2 with a spacer 9 interposed between them, and a cylindrical roller 10 is attached to the peripheral surface of the radial bearings 7 and 8.
is installed.

Between the radial bearing 8 and a fixing part 11 that fixes the support shaft 2, a coil spring 12 that biases the inner rotating part of the radial bearings 7 and 8 upward, which is fixed to the support shaft 2, is connected to the radial bearing 8. 8 side through a support ring 13. Further, a flange 14 is formed at the lower end of the roller 10 to support a magnetic tape being wound around.

[Problem that the invention attempts to solve]

In such a guide roller, two radial bearings 7 and 8 are used, and the structure is complicated and expensive.

In addition, when the coil spring 12 is inserted to prevent the roller 10 from wobbling, and the radial bearings 7 and 8 are biased in this way, the radial bearings 7 and 8 are worn out by the biasing force. Rotation accuracy may be disrupted, causing rattling, etc., and causing malfunction.

Therefore, this invention has a simple structure and allows smooth transportation of a band-shaped object such as a magnetic tape.

[Means for solving problems]

As shown in FIG. 2, the guide roller of this invention is a guide roller in which a cylindrical roller 29 is rotatably supported on a support shaft 19. axis 1
A plurality of balls are formed in a space surrounded by the rotation support surfaces 30 and 31, the support rings 24 and 25 provided on the support shaft 19, and the support shaft 19. 32, 33 are installed to rotatably support the roller 29 on the support shaft 19, and an elastic member (coil spring 28) is installed to support the support rings 24, 25 and the balls 32, 33.
The roller 29 is urged in one direction through the roller 29.

[Effect]

With this configuration, the support shaft 19
Rotation support surface 30, 3 of roller 29 provided above
1. A space surrounded by the support rings 24, 25 and the support shaft 19 is formed, and by installing a plurality of balls 32, 33 in the space, the roller 2
9 is rotatably supported on a support shaft 19.

When the support rings 24 and 25 are biased in one direction by an elastic member (coil spring 28), the balls 32 and 33 are biased in one direction through the support ring 25 due to the elasticity of the elastic member. 32 and 33 are rotation support surfaces 30 and 3 of the roller 29
1 and the support shaft 19, the roller 29 is tightly supported on the support shaft 19, and stable and smooth rotation is realized.

〔Example〕

FIG. 2 shows an embodiment of the guide roller of this invention.

In the figure, a cylindrical support shaft 19 is erected on the support frame 18 by fixing means such as press-fitting, and a flange portion 21 having a trapezoidal cross section is attached to a threaded portion 20 formed at the tip thereof. . A recess 22 is formed at the top of the flange 21 into which a jig for attaching and detaching the flange 21 is inserted, and this opening is filled with an adhesive 23 to prevent loosening.

The support shaft 19 has a support ring 24 at a spaced apart position.
25 is inserted, and a stopper 26 is fixed to its lower end with a screw 27 so that its position can be adjusted. A biasing coil spring 28 is inserted.

A cylindrical roller 29 made of a wear-resistant non-magnetic material is attached to the support shaft 19 with a rotatable gap therebetween. This roller 29
Rotation support surfaces 30 and 31 are formed at spaced apart positions on the inner surface of the support shaft 19 and are formed of outwardly expanding tapered surfaces forming a specific angle with the support shaft 19 and the circumferential surface. The support shaft 1 inside the support rings 24 and 25
9 and a roller 29 corresponding to this peripheral surface.
A plurality of balls 3 are placed in the space formed by the rotation support surfaces 30, 31 and the support rings 24, 25.
2 and 33 are installed, and a roller 29 is rotatably supported on the outer periphery of the support shaft 19 via the balls 32 and 33.

Furthermore, a flange 34 is formed at the lower end of the roller 29 in correspondence with the flange 21 to prevent the magnetic tape wound around the circumferential surface of the roller 29 from detaching.

With the above structure, the roller 29 is stably and rotatably supported on the support shaft 19 via the plurality of balls 32 and 33, and its rotational state is highly accurate and smooth. That is, the support shaft 19
A plurality of balls 32 are provided in a space surrounded by the peripheral surface of the support shaft 19, the rotational support surface 30 of the roller 29, and the support ring 24, and the peripheral surface of the support shaft 19, the roller 29
Since a plurality of balls 33 are provided in the space surrounded by the rotational support surface 31 and the support ring 25 to rotate the roller 29 on the support shaft 19, its structure is different from the conventional one using radial bearings. Since it is extremely simple compared to the above, manufacturing costs can be reduced and rattling due to wear can be prevented.

The balls 32, 33 are always biased in one direction by a coil spring 28 through the support ring 25, and the balls 32, 33, the peripheral surface of the support shaft 19, the support rings 24, 25, and the rotational support surface 3 of the roller 29.
Since the rollers 0 and 31 are in contact with each other with a constant pressure, a stable rotation state can be obtained, and even if each contact point is worn out, the contact state is maintained constant by the biasing force, so the roller 29 This allows smooth rotation to be achieved at all times without any rattling. For this reason, when a recording magnetic tape or a magnetic tape for playback is fed to the magnetic head or a magnetic tape from the magnetic head is transferred toward the cassette around the rotating head, the magnetic tape can be moved without causing any displacement or the like. The transfer state can be made smooth.

In addition, in the case of the above embodiment, the rotation support surfaces 30, 3
1 was formed as a tapered surface, but the same effect can be expected even if it is a curved surface.

[Effect of idea]

According to this invention, the roller can be freely rotated on the support shaft by installing a plurality of balls in the space surrounded by the rotation support surface of the roller provided on the support shaft, the support ring, and the support shaft. Since the support ring is biased in one direction by an elastic member, the elasticity of the elastic member pushes the ball through the support ring against the rotating support surface of the roller and the support shaft, causing the roller to come into close contact with the support shaft. Since it is supported by the rotor, the structure is simple, stable and smooth rotation can be obtained, and the manufacturing cost can be reduced.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing a conventional guide roller.
FIG. 2 is a longitudinal sectional view showing an embodiment of the guide roller of this invention. 19... Support shaft, 24, 25... Support ring, 28
... Coil spring (elastic member), 29 ... Roller, 30, 31 ... Rotation support surface, 32, 33 ...
…ball.

Claims (1)

[Claims for Utility Model Registration] (1) In a guide roller comprising a cylindrical roller rotatably supported on a support shaft, a specific roller is provided on the inner surface of the roller at a position spaced apart in the axial direction. A rotation support surface forming an angle is formed, and a plurality of balls are installed in a space surrounded by the rotation support surface, a support ring provided on the support shaft, and the support shaft, and the roller is rotated on the support shaft. A guide roller that is freely supported and has an elastic member installed to urge the ball in one direction through the support ring. (2) The guide roller according to claim 1, wherein the rotation support surface is a tapered surface or a curved surface that expands toward the end surface of the roller. (3) The guide roller according to claim 1, wherein the support ring is configured to axially movably attach the ball to the support ring at a spaced apart position on the support shaft. (4) The guide roller according to claim 1, wherein the roller is made of a non-magnetic material having wear resistance.