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 Title: |
US3873098:
ROTARY STYLUS RESHAPER
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Leedom, Marvin Allan; Princeton, NJ
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| Assignee: |
RCA Corporation, New York, NY
other patents from RCA CORPORATION (466175) (approx. 7,929)
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| Published / Filed: |
1975-03-25
/ 1974-01-30
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| Application Number: |
US1974000437966
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| IPC Code: |
Advanced:
B24B 19/16;
G11B 3/56;
G11B 9/07;
Core:
B24B 19/00;
G11B 3/00;
G11B 9/00;
IPC-7:
G11B 3/56;
G11B 3/58;
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| U.S. Class: |
Current:
369/071;
G9B/003.083;
Original:
274/001.R;
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| Field of Search: |
214/1 R
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| Priority Number: |
| 1974-01-30 |
US1974000437966 |
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| 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 reshaper is provided. A freely pivoted, light stylus-arm, carry the stylus, is mounted in a housing employed for movement of the stylus between a rest position and a play position. A rotatable drum, having an axle of rotation perpendicular to the longitudinal axis of the stylus-arm, is located under the stylus when the stylus is at the rest position. The drum has a plurality of circular and coaxial grooves, concentric with the drum, the grooves having walls of abrasive material dimensioned and configured for the purpose of reshaping worn stylus to a desired shape. A friction wheel, mounted on the axle carrying the drum, engages the turntable and causes rotation of the drum when the stylus is lowered into an abrasive groove, permitting reshaping of the stylus. Means, which may be manually or automatically actuated, are provided for lowering and raising of the stylus into and out of engagement with an abrasive groove on the drum when the stylus is at the rest position. A cleaning brush having its bristles in contact with the drum is secured to the board for the purpose of cleaning the drum.
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| Attorney, Agent or Firm: |
Whitacre, Eugene M. ;
Meagher, William H. ;
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| Primary / Asst. Examiners: |
Aegerter, Richard E.; Shepperd, John W.
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 8 known family members
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First Claim:
Show all 7 claims |
What is claimed is:
1. In a disc playback system including a board, a turntable mounted for rotation relative to said board, and having a surface adapted to receive a disc having a spiral groove with information recorded therein, a stylus having a tip subject to placement in said disc groove for recovering said information while in a play position, and a 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; a rotary stylus reshaper comprising;
- a rotatable drum having an axis of rotation perpendicular to the longitudinal axis of the stylus arm mounted on said board and located under said stylus when said stylus is at the rest position, said drum having a plurality of abrasive, coaxial, substantially V-shaped grooves, concentric with said drum, said V-shaped grooves having opening dimensions greater than the width dimension of said stylus tip;
- a drive means secured to said board and coupled to said drum for causing rotation of said drum for the purpose of reshaping said stylus; and
- means for lowering and raising of said stylus tip into and out of engagement with an abrasive groove on said drum when said stylus is at the rest position.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 1 U.S. patent(s) that reference this one
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