| 摘要 |
PURPOSE:To prevent the double recording of a signal, by permitting the recording of signal only when no signal is recorded on a magnetic sheet. CONSTITUTION:A recording/reproducing changeover switch 1 is turned to the recording side to record a signal on a magnetic sheet 10. A signal corresponding to a recording mode is applied to a control circuit 3 from the switch 1 as well as to a terminal 22a of a logical circuit 22. The signal corresponding to recording and non-recording of the sheet 10 which is detected by a magnetic head 6 and passed through a discriminating circuit 11 is applied to the other terminal 22b of the circuit 22. The circuit 22 receives the signal from the switch 1 and the circuit 11, and feeds it to a shift mechanism 7 when the sheet 10 is set in a recording state and then moves the head 6 to make it opposite to an unrecorded track on the sheet 10. This eliminates the double recording, and this action is repeated to perform recording to all tracks. |
