| 摘要 |
<p>PURPOSE:To dry the dew of a rotary drum quickly, by foring only the rotary drum to rotate once a dewing detecting circuit detects a dewing state. CONSTITUTION:When a dewing sensor 2 detects a dewing state, its resistance value increases and while the base of a transistor TR6 goes to a high level, the TR6 turns on. The conduction of the TR6 turns off a TR10 and a TR14 turns off to hold its collector at a low level. Then, an unloading circuit 30 places a tape in an unloading state and also opens a switch 21. A low-level signal from the collector of the TR14, on the other hand, sets the base of a TR23 to a low level via a diode 18. Therefore, the TR23 turns on to hold its collector at a high level, and with its high-level signal, a driving circuit 26 rotates a rotary drum. Consequently, the dew of the rotary drum is dried rapidly, so the damage of the tape is prevented.</p> |
