| 摘要 |
<p>PURPOSE:To prevent the separation of a tape from a rotating cylinder at the time of changing a tape speed by applying the tape speed information of a tape supply side through the impedance of a tape supply side to the servo driving loop of a capstan shaft at the time of changing the tape speed. CONSTITUTION:At the time of changing the tape speed according to a mode switching, switches 57, 58 are respectively turned on and off for a constant time. The speed information according to the difference between the take up side and the supply side tape speeds by a FG head passing a comparator 55 and speed detectors 41 and 24, 47 and 54 is supplied to an amplifier 32, the rotation of the capstan shaft 46 is servo-controlled to make the tape speed of the supply side and the take up side coincide. Accordingly, the tape speed information of this tape supply side is applied to the servo driving loop of the capstan shaft, thereby, the generation of a phenomenon for separating the tape from the rotating cylinder 45 at the time of changing the tape speed is prevented.</p> |
