JPH03122860A - Guide roller - Google Patents

Abstract

PURPOSE:To make the moment of inertia large for such a rotary roller having an enough small diameter and to enable the smooth rotation by using a metal cylinder having enough large specific gravity as compared with resin, press- fitting a resinous cylinder into a hollow part of this metal cylinder and forming the rotary roller accordingly. CONSTITUTION:Since the resinous cylinder 15 is press-fitted into the hollow part of the metal cylinder 16 to form the rotary roller 17, though the diameter of the rotary roller 17 is far smaller than a rotary roller formed of resin only, a vibration of a magnetic tape to be moved in contact along a tape guide surface is absorbed satisfactorily. In addition, since the circumferential surface of the resinous cylinder 15 is brought into contact with flanges 7 and 8 and a shaft 1 at the time of rotating the rotary roller 17, the rotary roller 17 is smoothly rotated without detriment to the advantage of the roller formed of resin only. By this method, the moment of inertia of the rotary roller can be made large, and the rotation can be smoothened as well.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention can be used, for example, in a video tape recorder, etc.
The present invention relates to a guide roller suitable for regulating the position of a magnetic tape that is being transported along with it.

[Prior Art] A conventional example of this type of guide roller will be explained using a partial cross-sectional view of FIG.

In FIG. 2, 1 is a shaft, and a guide roller rotation mechanism 2 and a tow 4 having a male screw 3 formed on the outer periphery are coaxially fitted together. installed after installation. Reference numeral 5 denotes a cylindrical rotating roller made of resin and having a support for the tape guide surface of the guide roller. To assemble the guide roller rotation mechanism 2, a flange 7 having a slot 6 is inserted into one end of the shaft 1 and fixed, with the flange 7 side facing down. Then, the rotating roller 5 is inserted and loosely fitted into the shaft 1, a hollow flange 8 is press-fitted thereon, and the rotating roller 5 is fixed at a position where the rotation is smooth, thereby forming the guide roller rotating mechanism 2. Thereafter, the trimmer 4 is press-fitted into the shaft 1 using a jig. Although not shown, a guide roller is used, for example, by standing upright on a metal base of a video tape recorder at a predetermined angle. In this case, the metal base is provided with a female screw hole that engages with the male screw 3 provided on the tomewa 4, and a flathead screwdriver is inserted into the slot 6 provided on the flange 7 to remove the entire guide roller. The height of the guide roller with respect to the metal base is adjusted by rotating it and tightening the male screw 3 provided on the handle 4.

[Problem to be solved by the invention]

When a magnetic tape is attached to the tape guide surface of the guide roller and transferred, the rotating roller rotates at a substantially constant speed. This constant speed motion of the rotating roller has the function of absorbing vibrations occurring in the magnetic tape being transferred, and the greater the moment of inertia of the rotating roller, the more effective it is.

In conventional guide rollers, since the rotating roller is formed only of resin, there is a problem in that if the moment of inertia of the rotating roller is increased, the diameter becomes thicker, resulting in an increase in the size of the guide roller.

[Means for Solving the Problems] This invention forms a rotating roller by press-fitting a resin cylinder into a hollow part of a metal cylinder, and also forms a single roller by sandwiching the rotating roller between first and second flanges. The first feature is that the shaft is sequentially inserted into the shaft.

Further, the circumferential surface of the resin tube is formed so as to rotate in contact with both flanges and the shaft, and the circumferential surface of the metal tube is formed so as not to contact with both flanges and the shaft, and the contact surface of the rotating roller is made of resin. The second feature is that it is configured to be formed on the circumferential surface of the cylinder.

[For production]

In the guide roller of the present invention, the rotating roller is formed by press-fitting the resin cylinder into the hollow part of the metal cylinder, so compared to the case where the rotating roller is formed only from resin, the rotating roller has a sufficiently narrow diameter. Vibrations of the magnetic tape that is transported with the tape guide surface attached are sufficiently absorbed. Furthermore, since the circumferential surface of the resin cylinder comes into contact with the flange and shaft when the rotating roller rotates, the rotating roller rotates smoothly, without detracting from the advantages of conventional rollers made only of resin.

〔Example〕

FIG. 1 shows a partial cross-sectional view, each showing an embodiment of the invention. The present invention will be explained below according to the embodiment shown in FIG. In FIG. 1, the same reference numerals as in FIG. 2 indicate the same parts.

In FIG. 1, reference numeral 1 denotes a shaft, which is fitted coaxially with a guide roller rotation mechanism 10 and a stopper 4 having a male screw 3 formed on its outer periphery, as described in FIG. is attached after assembling the guide roller rotation mechanism 10. Reference numeral 17 denotes a rotary roller made of a metal tube that supports the tape guide surface of the guide roller. It is constructed by being press-fitted into the hollow part of. To assemble the guide roller rotation mechanism 10, the flange 7 having the slot 6 is inserted into one end of the shaft 1 and fixed, with the flange 7 side facing down, in the same manner as described in FIG. Then, the rotating roller 17 is inserted into the shaft 1 and loosely fitted, a hollow flange 8 is pressed onto it, and the rotating roller 17 is fixed at a position where rotation is smooth, thereby forming the guide roller rotating mechanism 10. . In this rotating mechanism 10, both ends of the resin cylinder 15 forming the inner cylinder of the rotating roller 17 are connected to flanges 7 fixed to the shaft 1.
．． 8, but both ends of the metal cylinder 16 forming the outer cylinder are configured so as not to come into contact with the flange 7.8 fixed to the shaft 1. Thereafter, the guide roller is completed by press-fitting the tipper 4 into the shaft 1 using a jig in the same manner as explained in FIG. 2. The height of the guide roller relative to the metal base is adjusted by inserting a flat head screwdriver into the slot 6 and rotating the entire guide roller, and tightening the male screw 3 provided on the handle 4.

[Effects of the Invention] As explained above, in the guide roller of the present invention, a rotating roller is formed by using a metal cylinder whose specific gravity is sufficiently higher than that of resin, and press-fitting the resin cylinder into the hollow part of this metal cylinder. Therefore, compared to the case where the rotating roller is formed only from resin,
Although the rotating roller has a sufficiently small diameter, the moment of inertia can be increased, and the vibrations of the magnetic tape that is transported with the tape guide surface attached are sufficiently absorbed. In addition, when the rotating roller rotates, the circumferential surface of the resin tube comes into contact with the flange and shaft, so the rotating roller rotates smoothly, providing an equivalent effect without detracting from the advantages of conventional rollers made only of resin. play.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a guide roller showing an embodiment of the present invention, and FIG. 2 is a partial sectional view showing a conventional example. l...Shaft, 7.8...Flange, 10...Rotating mechanism, 15...Resin tube, 16...Metal tube, 17...Rotating roller. Patent application: Nippon Chemi-Con Co., Ltd.

Claims (2)

[Claims] (1) A rotating roller is formed by press-fitting a resin cylinder into the hollow part of a metal cylinder, and the rotating roller is sandwiched between first and second flanges and sequentially inserted into a single shaft. A guide roller featuring: (2) The circumferential surface of the resin cylinder is formed so as to be in contact with the flanges and the shaft, and the circumferential surface of the metal cylinder is formed so as not to contact with the flanges and the shaft, so that the circumferential surface thereof rotates. The guide roller according to claim 1, wherein a contact surface of the roller is formed on a peripheral surface of the resin cylinder.