Head feeding device including a screw shaft provided with a pair

Details Head feeding device including a screw shaft provided with a pair Head feeding device including a screw shaft provided with a pair

1996-10-04

1997-10-28

Evans, Jefferson

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

369223, G11B 555

Patent

active

056822820

ABSTRACT:
A head feeding device includes a screw shaft having a thread groove formed with a predetermined pitch, a driver for turning the screw shaft, a head guided in the axial direction of the screw shaft by a shaft bearing sliding on a surface of the screw shaft, and an engagement member that engages in the thread groove of the screw shaft and converts the turning force of the screw shaft into the axial head moving force. A second groove for containing a lubricant is formed on the screw shaft having the same pitch as that of the thread groove. The second groove retains lubricant scraped out of the thread groove by the engagement member. Therefore, lubricant is reliably supplied to the sliding surfaces between the screw shaft and the shaft bearing, thereby eliminating problems caused by increased friction or seizure, and thereby improving the head feeding accuracy.

REFERENCES:
patent: 3921969 (1975-11-01), Hickey et al.
patent: 3969768 (1976-07-01), Ebbing
patent: 4071866 (1978-01-01), Butsch
patent: 4848174 (1989-07-01), Brown et al.
patent: 5063557 (1991-11-01), Takamatsu et al.
patent: 5414578 (1995-05-01), Lian et al.
patent: 5535076 (1996-07-01), Kamioka et al.

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