Radial-tracking programmable record player

Details Radial-tracking programmable record player Radial-tracking programmable record player

1978-10-16

1980-09-16

Shepperd, John W.

Undertaking

274 23A, G11B 1706

Patent

active

042225744

ABSTRACT:
In a record player, a phonograph record disc is supported in a playing position on a turntable which is rotatably drivable at a selected speed about an axis. The disc, in its playing position, is engageable with a stylus carried by a transducer cartridge which is held in a carriage. The carriage is movable in a guide which defines a line of carriage movement radially of the turntable, the carriage being so movable in response to engagement of the stylus in the record groove. The player includes sensing means comprised of a follower member which is disposed adjacent the carriage and which is drivable along a path parallel to the carriage line for following the movement of the carriage during play of a record. The sensing means is operable for sensing the relative positions along the line and the path of the carriage and of the follower member, and for generating a signal indicative of such relative positions. The follower is driven, in a manner tending to drive the signal to zero, by a stepping motor, the drive pulses of which are counted to derive an indication of the position of the carriage at any time, or for use in driving the carriage via the follower to a predetermined position radially of the turntable. The follower is also a component of a lift mechanism which lifts the cartridge in the carriage, moving the stylus away from a record for traversal of the carriage radially of a record.

REFERENCES:
patent: 2293217 (1942-08-01), Rieber
patent: 2566091 (1951-08-01), Masterson
patent: 2915315 (1959-12-01), Rabinow
patent: 3381967 (1968-05-01), Miner et al.
patent: 4061342 (1977-12-01), Young
patent: 4093832 (1978-06-01), Isaacson et al.
patent: 4118039 (1978-10-01), Kuratal et al.
patent: 4135086 (1979-01-01), Baba
Makara Model 4824 Technical Report vol. 1.
Diatone Vertical Audio System X-1000.

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