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US 4,494,712 AGranted
Tape deck with non-contacting unidirectional rotation sensor configured to prevent capstan tape windup
AssigneeFord Motor Company
InventorsPaul K. Godwin, Jr., Howard A. Kell, Jr.
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Abstract
A tape deck, which incorporates a non-contacting take-up reel rotation sensing means and associated sensing circuit for enabling the capstan and take-up reel drive mechanism, includes a magnet which only rotates with the take-up reel when it is driven in the take-up direction. If the take-up reel changes direction, due to tape windup on the capstan, the magnet stops and the sensing circuit disables the drive mechanism to prevent excessive tape windup on the capstan.
Claims6
A tape deck including:
- means defining a mounting platform;
- a supply reel spindle and a take-up reel spindle on said platform means positioned for accepting respective supply and take-up reels;
- means connected to said platform means for driving said take-up reel spindle in a predetermined rotational direction;
- multipolar magnetic field producing means mounted between said take-up reel spindle and said platform means for rotating with said take-up reel spindle only when said spindle rotates in said predetermined rotational direction;
- one way clutch means between said platform means and said magnetic field producing means for allowing said field producing means to rotate only in said predetermined rotational direction and to prevent rotation of said field producing means in the opposite rotational direction;
- and
- means adjacent said magnetic field producing means for sensing the rotation thereof and providing an appropriate electrical signal output.
4 more elements
Dependencies are inferred from the claim text.