# US 4,166,623 A · Pickup needle cleaning device for record disc playback apparatus

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- Number: US 4,166,623 A
- Document ID: US4166623A
- Status: Granted
- Kind: A
- Application number: 05/870,209
- Filed: 1978-01-17
- Granted: 1979-09-04
- Earliest claimed: 1978-01-17
- Assignees: Matsushita Electric Industries Co., Ltd.
- Inventors: Kenji Nanbu; Akio Kuki
- Web page: https://patentgrep.com/patent/US4166623A

## CPC

- G11B 3/5881: {for styli or needles only}
- G11B 3/36: Automatic-feed mechanisms producing progressive transducing traverse across record carriers otherwise than by grooves, e.g. by lead-screw
- G11B 3/38: Guiding, e.g. constructions or arrangements providing linear or other special tracking characteristics
- G11B 3/589: {before or after transducing operation}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

Disclosed is a pickup needle cleaning device adapted to be incorporated in a record disk playback system having a carriage adapted to move above and across the surface of a record disk and mounting a pickup needle for optional engagement with the record disk. The cleaning device includes cleaning members carried by the carriage and adapted to move relatively to the pickup needle while keeping in contact therewith. The cleaning member is put into operation upon the upward or downward movement of the pickup needle.

## Claims

### Claim 1

A pickup needle cleaning device for a recording disk playback apparatus comprising:
a pickup needle adapted to detect recorded signals from a recording disc,
means for holding said pickup needle,
a carrige supporting said holding means and adapted to move above and along the recording disk,
means for driving said carriage above and along said recording disk,
means, mounted on said carriage, for moving said holding means to lift and lower said pickup needle so as to move said pickup needle towards and away from the recording surface of said recording disk,
means, mounted on said carriage, for actuating said lifting and lowering means,
means, mounted on said carriage, when driven, for cleaning said pickup needle, and
means for driving said cleaning means in association with the lifting and lowering operation of said pickup needle.

### Claim 2 (depends on 1)

A pickup needle cleaning device as claimed in claim 1, wherein said cleaning means includes at least one cleaning member adapted to rotate in the vicinity of said pickup needle in the lifted position and to move into and out of contact with said pickup needle in association with the rotation of said cleaning member.

### Claim 3 (depends on 2)

A pickup needle cleaning device as claimed in claim 2, wherein said cleaning member is held at an angle of inclination with respect to the plane in which it is rotated.

### Claim 4 (depends on 2)

A pickup needle cleaning device as claimed in claim 2, wherein said means for lifting and lowering the pickup needle includes an arm adapted to be rotated in a horizontal plane by said actuating means, said arm having a horizontal flat section succeeded by an inclined section, said means for holding the pickup needle having a portion thereof resting on said arm, whereby said means for holding the pickup needle slides from said horizontal flat section to said inclined section of said arm in accordance with the rotation of the latter so as to be lowered and to cause the rotation of said cleaning member.

### Claim 5 (depends on 2)

A pickup needle cleaning device as claimed in claim 2, wherein said means for lifting and lowering the pickup needle includes a cam adapted to be rotated in a vertical plane by said actuating means and having a periphery contacted by said means for holding the pickup needle, whereby said means for holding the pickup needle is lowered and said cleaning member is rotated.

### Claim 6 (depends on 1)

A pickup needle cleaning device as claimed in claim 1, wherein said means for driving drives said cleaning member during a time preceding the lowering of said pickup needle.

### Claim 7 (depends on 1)

A pickup needle cleaning device as claimed in claim 1, wherein said actuating means includes a clutch means adapted for optional engagement with said means for driving said carriage.

### Claim 8 (depends on 1)

A pickup needle cleaning device as claimed in claim 1, further comprising a first rotating member extending in the direction of movement of said carriage, a second rotating member engaged with said first rotating member and moved with said carriage in the direction of movement of said carriage, and a clutch means selectively engageable with said second rotating member for driving said actuating means.