US3881734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary stylus cleaner
Assignee: RCA Corp
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Filing: 1974-01-30
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Granted: 1975-05-06
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Expires: 1994-01-30
Abstract
Abstract In a playback system employing a stylus to recover recorded signals from a video disc when relative motion between the disc and the stylus is established, a rotary stylus cleaner is provided. A freely pivoted, light stylus-arm carrying the stylus is mounted in a housing employed for movement of the stylus between a rest position and a play position. A rotary brush having an axis of rotation perpendicular to the longitudinal axis of the stylus-arm, is located in the path of movement of the stylus between the rest position and the play position. A friction wheel mounted on the axle carrying the rotatable brush, engages the turntable and causes rotation of the brush as the stylus threads through the brush during its travel between the rest position and the play position. A comb having its teeth in engagement with the bristles of the brush is secured to the board for the purpose of cleaning the brush.
Inventors
- 👤 Marvin Allan Leedom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:11
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/58; G11B3/5809; G11B3/5881; G11B3/44; G11B3/56
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
191 words
In a disc playback system including a board, a turntable mounted for rotation relative to said board and having a turntable surface adapted to receive a disc having a spiral groove with information recorded therein; a stylus subject to placement in said groove for recovering said information while in a play position; and a light stylus-arm carrying said stylus, said stylus-arm being mounted with respect to said board in a manner perMitting movement of said stylus between rest and play positions substantially radially of said disc; a rotary stylus cleaner comprising: a rotatable brush, having an axis of rotation substantially perpendicular to the longitudinal axis of the light stylus-arm mounted on said board, said brush including bristles with axes ordinarily disposed in planes substantially parallel to the stylus-arm longitudinal axis and substantially perpendicular to the axis of rotation of said brush, and said brush being located in the path of movement of said stylus between the rest position and the play position radially of said disc; and drive means secured to said board and coupled to said brush for causing rotation of said brush for the purpose of cleaning said stylus.
Claim 2
Dependent Claim
191 words
In a disc playback system including a board, a turntable mounted for rotation relative to said board and having a turntable surface adapted to receive a disc having a spiral groove with information recorded therein; a stylus subject to placement in said groove for recovering said information while in a play position; and a light stylus-arm carrying said stylus, said stylus-arm being mounted with respect to said board in a manner perMitting movement of said stylus between rest and play positions substantially radially of said disc; a rotary stylus cleaner comprising: a rotatable brush, having an axis of rotation substantially perpendicular to the longitudinal axis of the light stylus-arm mounted on said board, said brush including bristles with axes ordinarily disposed in planes substantially parallel to the stylus-arm longitudinal axis and substantially perpendicular to the axis of rotation of said brush, and said brush being located in the path of movement of said stylus between the rest position and the play position radially of said disc; and drive means secured to said board and coupled to said brush for causing rotation of said brush for the purpose of cleaning said stylus.
Claim 3
Dependent Claim
23 words
A system as defined in claim 1 wherein said drive means for rotating said brush includes a wheel frictionally driven by said turntable.
Claim 4
Dependent Claim
27 words
A system as defined in claim 2 wherein the coupling between said brush and said drive means is a common axle carrying said wheel and said brush.
Claim 5
Dependent Claim
29 words
A system defined in claim 1 further including a comb secured to said board having its teeth in engagement with said brush for the purpose of cleaning said brush.
Claim 6
Dependent Claim
31 words
A system as defined in claim 1 wherein the direction of rotation of said brush is such as to produce tension in said stylus-arm during its movement through said brush location.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |