Reel brake and associated tension arm control device for a reversible tape recording and/or reproducing apparatus

Claim 1

A reel brake and associated tension arm control device for a reversible tape recording and/or reproducing apparatus which has a stop mode, a forward recording or reproduction mode and a reverse reproduction mode, said reversible tape recording and/or reproducing apparatus comprising a guide drum having at least one head for recording an/or reproducing a signal on and/or from a tape, supply and take-up reel discs engageable with a tape cassette which is loaded in said apparatus, tape guiding means for guiding said tape in a predetermined path in which said tape extends out of said tape cassette and makes contact with said guide drum, driving means for driving said tape in said predetermined path so that said tape moves in a forward direction during said forward recording or reproduction mode and in a reverse direction during said reverse reproduction mode, and braking means for braking said supply and take-up reel discs so that said tape stops during said stop mode, said reel brake and associated tension arm control device comprising: a tension control mechanism for controlling a tension in said tape, said tension control mechanism comprising a rotary tension arm biased in one direction for making contact with said tape at a tip end of said tension arm and for applying a pressure to said tape at a tension-applied position, and a supply reel disc braking member formed as a part of said braking means for braking said supply reel disc, said supply disc braking member being connected to said tension arm; a rotary cam body which rotates to first, second and third rotational positions when said reversible tape recording and/or reproducing apparatus assumes said stop mode, said forward recording or reproduction mode and said reverse reproduction mode, respectively; and cam and link means engageable with said tension arm and undergoing a displacement responsive to a rotation of said rotary cam body, said cam and link means undergoing a displacement from a first position to a second position when said rotary cam body rotates from said first rotational position to said second rotational position, in response to which said tension arm is displaced in said one direction to said tension-applied position and said supply reel disc braking member is tensioned, said cam and link means undergoing a further displacement from said second position to a third position when said rotary cam body rotates from said second rotational position to said third rotational position, in response to which said tension arm is displaced in the other direction from said tension-applied position to a predetermined recessed position whereby said supply reel disc braking member is simultaneously released from the supply reel disc.