Drum assembly in magnetic recording/reproducing apparatus and ma

Details Drum assembly in magnetic recording/reproducing apparatus and ma Drum assembly in magnetic recording/reproducing apparatus and ma

1988-11-28

1990-12-11

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Head accessory

360 84, G11B 1560, G11B 5027

Patent

active

049774735

ABSTRACT:
Improvement of a lower cylinder of a drum assembly for a helical scan type magnetic recording/reproducing apparatus, a magnetic tape being wrapped around the drum assembly in a predetermined angular range with respect to its own axis which is wider than a scanning angular range so as to have an additional tape-wrapping angular range on at least a tape-entry portion from which the tape starts to be wrapped around the drum assembly. The lower cylinder integrally has on its outer circumferential surface a tape-guiding portion for guiding the tape on wrapping it around the drum assembly, a tape-wrapping portion on which the magentic tape is wrapped along the tape-guiding portion in a direction substantially coincident with a direction of rotation of the upper cylinder and a protruding portion formed in the additional tape-wrapping angular range so as to be protruded by a predetermined amount with respect to the tape-wrapping portion. The protruding portion initially comes into contact with the tape to be entered onto the drum assembly and has a wedge-like shape in which its top is substantially directed in the tape-travelling direction. The protruding amount of the protruding portion with respect to the tape-wrapping portion being substantially equal to a protruding amount of the magnetic head from an upper cylinder of the drum assembly.

REFERENCES:
patent: 3930270 (1975-12-01), Tanigawa et al.
patent: 4833562 (1989-05-01), Kochi
"Television Technique" May 1987, vol. 35; pp. 26-32 by Kotaro Kawamura et al.

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