| 摘要 |
<p>PURPOSE:To eliminate a malfunction and to enable energy saving and the reciprocating recording of electromagnetic operation in small size by checking one part of the magnetic erasing head supported on both ends of the recording arm integrally advancing with a sound recording substrate at sound recording time by a rod. CONSTITUTION:A positive and reverse rod 35 is moved to the right at normal rotation time and to the left at reverse rotation time integrally with a normal and reverse rod B112 by a sound recording motion. At the advance time of a sound recording substrate 104 and the sound recording arm 102 pivotally supported by the shaft 103 thereof, the head 100 of the magnetic erasing heads 100, 101 supported at both ends of the arm is blocked by a rod 112 and the head 101 only is advanced to subject a pinch roll to pressure fitting to a capstan. Consequently an energy saving is realized with a magnetic erasing method with less malfunctions and the reciprocating sound recording can be done with a small sized electromagnetic operation.</p> |
