Patent ID: 7806400
Filing Date: 2010-10-05
Classification: B65H

Abstract:
1. An image forming apparatus comprising: a tray; an image forming unit; and a sheet feeding device configured to feed a sheet to the image forming unit after loosening sheets stacked on the tray by blowing air on the sheets, the sheet feeding device comprising: wherein the rotation frequency of the fan is subjected to pulse-width modulation (PWM) control, and during the adjustment of the rotation frequency of the fan, when the determining unit determines that the rotation frequency of the fan does not fall within the target rotation-frequency range, a PWM value of the rotation frequency of the fan is adjusted to a PWM value at which the rotation frequency of the fan falls within the target rotation-frequency range, and the control portion controls the fan to rotate at the adjusted rotation frequency for a feeding job subsequent to a feeding job associated with the detected multi-feed condition.