JPS6336515Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to rollers for guiding the transport of a strip, for example a magnetic tape around a video head in a biotape 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. This guide roller, unlike a drive roller such as a pinch roller, is used simply to guide the transport of the magnetic tape. The guide roller is installed vertically or inclined to the support frame adjacent to the video head, and its angle and rotational state affect the image, so high precision is required.

Conventionally, the flange installed at the end of the support shaft is attached to a threaded part formed at the end of the support shaft, and after adjusting its position, adhesive is poured into the opening of the flange to prevent it from loosening. , it is intended to be permanently fixed. Although this type of fixing method is commonly used, fine adjustment after fixing is not possible, and it is not suitable for making the lower surface of the flange perpendicular to the support shaft with high precision. It is. That is, the screws themselves have some slack to allow for rotation, which makes it difficult to maintain the bottom surface of the collar horizontally, and the adhesive may also fix the collar at an angle. There is.

SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a guide roller in which the flange portion is fixed to the support shaft with high precision and the fixed position can be adjusted as desired.

That is, the guide roller of this invention has a flange whose axial position can be adjusted through a threaded hole formed on a support shaft, and a rotary support surface consisting of an inclined surface formed inside a cylindrical roller. , A plurality of balls are installed in a space formed by the circumferential surface of the support shaft and the flange to rotatably support the roller on the support shaft, and a fixing screw is inserted into the screw hole of the flange from the side facing the support shaft. In this case, the end of the fixing screw and the end of the support shaft are brought into contact within the screw hole to restrain the collar portion on the support shaft.

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. A stopper 4 is fixed to the cylindrical support shaft 2 by a fixing screw 6 whose vertical position can be adjusted, leaving a portion necessary for fixing. A spring 8 is inserted into the upper part of the stopper 4, and a support ring 10 is installed, and a plurality of balls 12 are installed on the upper surface of the support ring 10. this ball 1
A cylindrical roller 14 made of a hard non-magnetic material having wear resistance is supported on the roller 2 . That is, a rotational support surface 16 that comes into contact with the ball 12 is formed on the inner circumference of the roller 14, and this rotational support surface 16 is formed into a tapered surface that expands downward. Face 16 to ball 12
The support shaft 2 is supported by the support shaft 2 in contact with the support shaft 2. A flange 18 is formed at the lower end of the roller 14 to support a magnetic tape wound around its circumferential surface.

Further, a similar rotational support surface 20 is formed on the upper inner peripheral portion of the roller 14, which is spaced apart from the rotational support surface 16, and a plurality of balls 2 are formed on this rotational support surface 20.
2 is installed. The threaded portion 24 formed at the upper end of the support shaft 2 has a threaded hole 30 formed therein with a flange portion 28 having a trapezoidal cross section and a supporting surface 26 opposite to the rotational supporting surface 20 formed on the lower surface thereof. It is made possible to install by. A recess 32 for inserting a jig for attachment/detachment is formed in the upper end surface of the flange 28, and a screw hole 30 of the flange 28 is provided with a fixing screw from the side facing the support shaft 2. 34 is attached, and the top of the support shaft 2 and the end of the fixing screw 34 are brought into contact with each other inside the screw hole 30, so that the collar 28 is restrained.

With the structure described above, as shown in FIG.
Screw in the threaded part 24 of the
The fixing screw 34 is screwed into the upper opening of the support shaft 2 from the side opposite to the top of the support shaft 2, and the flange 28 is screwed into the upper opening of the support shaft 2.
Fixed to. The guide roller configured in this manner is attached to the fixing hole 38 of the support frame 36 by a fixing means such as press fitting.

FIG. 3 shows the state in which the collar portion 28 is fixed on the support shaft 2. As shown in FIG. A fixing screw 3 is installed in the screw hole 30 of the flange 28.
4, the lower inclined surface 42 of the crest 40 of the threaded portion 24 of the support shaft 2 aligns with the ridge 44 of the screw hole 30.
The support surface 26 of the collar portion 28 can be fixed with high precision in a direction orthogonal to the support shaft 2. Therefore, the flange 28 can function as the support ring 10 for the ball 22, and the structure near the flange 28 can be simplified. Moreover, unlike conventional fixing with adhesive, the flange 28
After fixing, fine adjustment is possible.

Furthermore, this guide roller can be assembled separately from the assembly and attachment of the support frame, etc., and the assembly accuracy can be improved. Unlike the conventional method, after fixing the support shaft 2 to the support frame 36, there is no inconvenience such as having to work in a narrow space or requiring complicated work steps.

Further, according to such a configuration, a plurality of balls 12, 22 are arranged on the circumferential surface of the support shaft 2, and the rotation support surfaces 16, 2 of the roller 14 are attached to the balls 12, 22.
0 is brought into contact with the roller 14 to be rotatably supported by the support shaft 2, and since the balls 12 and 22 are always urged with a constant pressure by the spring 8,
The structure is simple and stable and smooth rotation can be maintained for a long period of time.

As a result, 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, it is possible to transfer the magnetic tape without causing any displacement. The transfer state can be made smooth.

As explained above, according to this invention, a flange is attached so that its axial position can be adjusted through a screw hole in a threaded part formed on a support shaft, and an inclined surface formed inside a cylindrical roller is attached. rotating support surface,
A plurality of balls are installed in a space formed by the circumferential surface of the support shaft and the flange to rotatably support the roller on the support shaft, and a fixing screw is attached to the screw hole in the flange from the side opposite to the support shaft. Since the end of this fixing screw and the end of the support shaft are brought into contact within the screw hole and the flange is restrained on the support shaft, the flange can be fixed on the support shaft with high precision. The ball can be supported on the lower surface side of the collar, a stable rotation state can be obtained, and the rotation structure can be simplified.

[Brief explanation of the drawing]

Fig. 1 is an exploded longitudinal sectional view showing an embodiment of the guide roller of this invention, Fig. 2 is a longitudinal sectional view showing its assembled state, and Fig. 3 is a partial sectional view showing the fixed state of the collar. . 2... Support shaft, 14... Roller, 26... Support surface, 28... Flange.

Claims (1)

[Scope of utility model registration request] A collar part is attached to the threaded part formed on the support shaft so that its axial position can be adjusted through a screw hole, and a rotary support surface consisting of an inclined surface formed on the inside of a cylindrical roller, a peripheral surface of the support shaft and the A plurality of balls are installed in a space formed by the flange to rotatably support the roller on a support shaft, and a fixing screw is attached to the screw hole of the flange from the side opposite to the support shaft to fix the roller. A guide roller in which an end of a screw and an end of the support shaft are brought into contact within the screw hole to restrain the flange on the support shaft.