| 摘要 |
<p>PURPOSE:To prevent excessive load from being added on a gear or the other component part by impressing a pulse voltage corresponding to desired joining force on an electro-magnetic clutch. CONSTITUTION:A control circuit 200 for controlling the connection or disconnection of the electro-magnetic clutches 104, 105 is provided with a soft start means 201 which impresses electric power with respect to the clutch for normal rotation 104 by fixed pulse content in an idle rotation area and a preliminary rotation area at the start time of a scanning system, an equal velocity moving means 202 which moves the scanning system at equal velocity by impressing the prescribed pulse voltage on both clutches 104, 105 and a soft stop means 203 which impresses the electric power with respect to the clutch for reverse rotation 105 by the fixed pulse content at the stop time of the scanning system. The pulse content of the pulsed voltage is set by a pulse content set means 303 selectively set t a value that the desired joining force is achieved at the clutches 104, 105.</p> |
