| 摘要 |
<p>PURPOSE:To reduce the power consumption and to prevent the overheat of a capstan motor by stopping the capstan motor in case a feed magnet is not energized for a fixed period of time and driving the capstan motor only when a tape is fed. CONSTITUTION:A capstan motor 3 of a tape reader is excited, and a contact is secured between a capstan roller 2 and a feed roller 4 with revolutions of the motor 3. Then a tape 1 is fed by an exciting magnet 5. When the excitation of the magnet 5 is cut off, a brake magnet 6 is excited to stop the feed of the tape 1. The output given from a data processing part 14 of the tape reader is applied to a monostable multivibrator 15 via a data output part 12. Then it is detected by a logical circuit consisting of OR gates 16 and 22, a NAND gate 19, etc. that the magnet 5 is not excited for a fixed period of time. Then a relay 24 is actuated to stop the revolution of the motor 3. This reduces the power consumption and prevents the overheat of the motor 3.</p> |
