Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-03-27
1976-06-01
Cardillo, Jr., Raymond F.
Telegraphy
Systems
Simplex-reversing periodic
178 66DD, 178 66FS, 1791004D, 1791004R, 274 13R, 360 10, H04N 576, G11B 310, G11B 338, G11B 1700
Patent
active
039611310
ABSTRACT:
In a system for playing back prerecorded signals from a spirally grooved disc record by a groove-engaging signal pickup secured to a pickup arm when relative speed is established therebetween, a locked groove escape apparatus is provided. A transducer varies the position of the signal pickup in relation to the groove in a manner that opposes deviations of the relative speed from a predetermined speed. A carriage housing the pickup arm is mounted on the player base for movement between a playback mode and a standby mode. The carriage is driven radially inward in synchronization with rotation of the disc record during playback independent of radial motion of the signal pickup due to the spiral groove. A locked groove detector coupled to the transducer generates a locked groove recognition pulse when the signal pickup encounters a locked groove. A guide member is secured to the carriage contiguous to the free end of the pickup arm such that when the transducer drives the pickup arm in response to the locked groove recognition pulse against the guide member, a radially inward movement of the pickup arm is effected, whereby the signal pickup is relieved from the locked groove condition. In another embodiment of the present invention, a steering member is secured to the carriage adjacent the pickup arm such that the steering member and the disc record center are on the opposite sides of the pickup arm. When the signal pickup encounters a locked groove, the advancing steering member engages the pickup arm in order to effect radially inward movement thereof, thereby relieving the signal pickup from the locked groove condition.
REFERENCES:
patent: 2921992 (1960-01-01), Bick
patent: 3437763 (1969-04-01), Anderson et al.
patent: 3711641 (1973-01-01), Palmer
patent: 3767848 (1973-10-01), Schuller
patent: 3854015 (1974-12-01), Janssen
patent: 3911211 (1975-10-01), Rennick
Cardillo, Jr. Raymond F.
Kulkarni Dilip A.
Meagher William H.
RCA Corporation
Whitacre Eugene M.
LandOfFree
Disc record locked groove escape apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Disc record locked groove escape apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disc record locked groove escape apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2403791