Logic circuit for detecting reverse rotation of a take-up...

Details Logic circuit for detecting reverse rotation of a take-up... Logic circuit for detecting reverse rotation of a take-up...

G - Physics

11

B

352/21.23

G11B 15/093 (2006.01) G11B 15/22 (2006.01) G11B 15/48 (2006.01)

Patent

CA 1301917

- 18 - ABSTRACT OF THE DISCLOSURE A circuit is disclosed for sensing immediately reverse motion of a take-up reel spindle of a tape player and thereby excessive tape wind-up is sensed. A plu- rality of take-up reel rotation sensing switches are monitored by a logic circuit and are configured and mounted to produce a proper switch activation sequence when the take-up reel is properly dimensioned to provide an improper activation sequence when the take-up reel is rotated in the opposite direction. The logic circuit monitors the switch activation and enables the appli- cation of continuous drive energy to the tape drive mechanism as long as the sequence is of the correct sequence and above a predetermined frequency or rotation rate. However, if the frequency of switch activation drops below the predetermined level or the switch activa- tion sequence changes, drive power is inhibited, or reversed, depending on the design of tape mechanism.

505532

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