| 摘要 |
<p>PURPOSE:To eliminate the need for mechanical adjustment and to enable stable loading and unloading of a tape by controlling the driving of a loading motor so as to minimize the absolute value of the difference in the output level detected by the number of revolutions of a reel base at the time of taking in and out of the tape of a cassette cape and the reference value. CONSTITUTION:The pulse in the frequencies corresponding to the number of revolutions is outputted from a pulse generator 22 with the turning of the winding reel 21 turning at the time of taking in and out of the tape of a cassette tape and converted into a DC current by a frequency-voltage converting circuit 24. This DC voltage is compared with the reference value by a differential amplifier 26 to detect the level difference, a loading motor 12 is subjected to feedback control via a driving circuit 29 so that the level difference absolute value may become min. and its number of revolutions are almost held constantly. A stable tape loading and unloading are thus executed even with the variation in the load of the loading motor without doing mechanical adjustment, etc.</p> |
