Dynamic magnetic information storage or retrieval – Head – Head accessory
Patent
1982-08-13
1985-11-12
Kilgore, Robert M.
Dynamic magnetic information storage or retrieval
Head
Head accessory
226193, 360 93, G11B 1528, G11B 1560, B65H 1720
Patent
active
045531862
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a tape drive member suitably adapted as a capstan of, for example, a tape recorder and to a manufacturing method for the same, and more particularly, to a tape drive member which is capable of driving a tape in a stable and reliable manner.
2. Background Art
As is well known, a capstan of a tape recorder as an example of a tape drive member is supported in the manner shown in FIG. 1. Referring to FIG. 1, reference numeral 11 denotes a main chassis of a tape recorder which has a through-hole 111, formed at a predetermined position thereof, through which extends a support cylinder 12. A flange 121 is formed substantially midway along the support cylinder 12. Screws 13 are respectively inserted into through-holes 122 and threadably engage with screw holes 112 formed in the main chassis 11. In this manner, the support cylinder 12 is fixed onto the main chassis 11.
A capstan 14 extends through the support cylinder 12. The capstan 14 rotates with a flywheel since its lower portion is inserted and fixed in a through-hole 151 formed at the center of rotation of the flywheel 15. The capstan 14 is supported by support members 16 and 17 which are arranged at the upper and lower ends, respectively, of the support cylinder 12 so that the capstan 14 may rotate smoothly without jolting. The lower end of the capstan 14 is in contact with a bearing 19 of a subchassis 18 which is arranged substantially parallel to the main chassis 11. The flywheel 15 is coupled through a belt 20 to a motor (not shown) to be driven thereby.
A pinch roller 22 is urged against the upper portion (FIG. 1) of the capstan 14 in putting a tape 21 therebetween. The pinch roller 22 is rotatably mounted through a support member 26 on a shaft 24 extending from a slider 23 which is slidable in the directions indicated by arrows A and B in synchronism with the operation of a tape constant speed drive member (not shown). In the tape drive stop state, the rotational force of the motor as described above is transmitted to the flywheel 15 and the capstan 14, which rotate stably. However, since the slider 23 has been moved in the direction indicated by arrow B and the pinch roller 22 is separated from the capstan 14, the tape 21 is not driven. When the tape constant speed drive member is operated in the tape drive state, the slider 23 is synchronously slid in the direction indicated by arrow A. Then, the pinch roller 24 is urged against the rotating capstan 14 in putting the tape 21 therebetween, as shown enlarged in FIGS. 2(a) and 2(b), and the tape 21 is driven.
The driving force F for driving the tape 21 by the capstan 14 may be approximately given by the following equation: 22; and constant, the friction coefficients .mu.1 and .mu.2 must be increased in order to obtain a greater driving force F, thereby driving the tape 21 in a stable and reliable manner.
Meanwhile, the portion of the capstan 14 which is supported by the support cylinder 12 through the support members 16 and 17 preferably cause low friction to ensure smooth rotation. On the other hand, the tape driving portion of the capstan 14 to which the pinch roller 22 is urged must have a high friction coefficient.
For this reason, a conventional capstan 14 is made of stainless steel which is ternary alloy of iron (Fe), chrome (Cr) and nickel (Ni) as major components to have a smooth surface with a small friction coefficient. The tape driving portion of the capstan 14 which will be brought into contact with the tape 21 is treated by sand blasting or the like. According to the sand blasting treatment, fine hard particles (e.g., of a ceramic) are collided at high speed against the tape driving portion of the capstan 14 so as to abrade the tape driving portion to a rough surface 26 as shown in FIG. 3. When the pinch roller 22 is urged against the rough surfaced tape driving portion 26 of the capstan 14 in putting the tape 21 therebetween, the friction coefficient .mu.1 between the tape 21 and the pinch roller 22 and the fri
REFERENCES:
patent: 3141593 (1964-07-01), Selsted
patent: 3445116 (1969-05-01), Knox
patent: 3919717 (1975-11-01), Cullen
patent: 4163266 (1979-07-01), Tatamura
patent: 4307427 (1981-12-01), Kawachi
patent: 4310863 (1982-01-01), Lelandais
Kawakami Hiroshi
Torii Shigeyoshi
Kilgore Robert M.
Tokyo Shibaura Denki Kabushiki Kaisha
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