| 摘要 |
<p>A low-power tape reader which can reliably stop the feed of a tape (3) at a first rewind stop code with a small reel motor (2, 20) and a brake magnet (11) which may have somewhat inferior response characteristics. In response to a rewind command, the rotational speed of a capstan motor (12) is changed over from a forward low speed to a reverse low speed. After the reverse low speed has been reached, a feed magnet (14) is actuated to rewind the tape (3). As the rewinding of the tape (3) is started, the speed of the caspstan motor (12) is gradually increased to a reverse high speed. When a rewind stop code is detected, the speed of the capstan motor (12) is gradually lowered to the reverse low speed. When the reverse low speed is reached, the brake magnet (11) is actuated to stop the tape feed (3) temporarily. A reversible counter (4) stores therein the number of sprocket signals or the number of rewind stop codes detected from the time when the first rewind stop code is detected to the time when the feed of the tape (3) is temporarily stopped. After the tape (3) has stopped, the speed of the capstan motor (12) is changed to the forward low speed. When the forward low speed is reached, the feed magnet (14) is actuated to feed the tape (3) in the forward direction, and the number of detected rewind stop codes or sprocket signals is subtracted from the contents of the reversible counter (40). When the contents of the counter (40) are zero, the brake magnet (11) is actuated to stop the feed of the tape (3).</p> |
