Magnetic recording and reproducing device

Claim 1

A control device of a magnetic recording and reproducing apparatus for use with a tape cassette containing a tape having first and second tracks in which signals are to be recorded and reproduced during transfer of the tape in forward and reverse directions, respectively, and including first and second removable portions which, by their presence and absence, indicate the absence and pressure, respectively, of recorded signals which are to be preserved in said first and second tracks; said control device comprising first and second detecting members engageable with a cassette on the recording and reproducing apparatus for detecting the presence or absence of said first and second removable portions, respectively, of the cassette, a record control member movable from a reproducing position corresponding to the reproducing mode of operation of the apparatus to a record position corresponding to the recording mode of operation of the apparatus, first and second tape transfer control members which are displaceable for initiating the transfer of the tape in said forward and reverse directions, respectively, and blocking means rendered operative in response to movement of said record control member to said record position to be engaged by each of said first and second detecting members which detects the absence of the respective removable portion from the cassette, said blocking means, when engaged by said first and second detecting members, being effective to block the displacement of said first and second tape transfer control members, respectively, whereby to prevent recording of signals in a track of the tape already occupied by recorded signals which are to be preserved.