| 摘要 |
<p>PURPOSE:To prevent mistaken driving to opposite direction, by combining a non-inverting and inverting output signal of a bistable multivibrator circuit with a reel operating signal and controlling a driving circuit. CONSTITUTION:The polarity change of a forward/reverse driving circuit 2 of a motor M is cooperated with a bistable multivibrator 4, a drive discrimination circuit 5, a protection selecting circuit 7 and a current amplifier, and the number of revolutions is varied into two stages with an input signal H of a conversion circuit 3. In the bistable multivibrator 4, the non-inverting output of the output signal is outputted at a terminal Q and a inverting output is outputted at a terminal Q' with the pulse input of a switching operation signal P. The protection selecting circuit 7 prevents a forward and a reverse signal from being outputted at the same time. The driving discrimination circuit 5 outputs a forward signal U or a reverse signal V through the combination of the inverting or the non-inverting output and drives the motor M with amplifications 6A and 6B. Thus, even if the operation signals E and F are mistaken, the driving in error can be prevented with the output of the vibrator 4.</p> |
