Paper feeding apparatus and driving method thereof for office machine

A method for driving a paper feeding apparatus, said paper feeding apparatus feeding a paper to a paper processing apparatus, the paper feeding apparatus comprising a pickup roller for retrieving the paper, a delivery roller for delivering the paper delivered from the pickup roller, an active roller for selectively blocking or delivering the paper delivered from the delivery roller, and a driving device for selectively rotating the pickup roller, the delivery roller and the active roller, said method comprising the steps of:

• while the feeding apparatus starts feeding the paper, the driving device rotating the pickup roller to retrieve the paper, driving the delivery roller to rotate in a first direction to generate a delivery force to deliver the paper delivered from the delivery roller, and driving the active roller to rotate in a second direction to generate a blocking force which is opposite to the delivery force, to block the paper delivered from the delivery roller;
• while a leading edge of paper is located between the delivery roller and the active roller, the driving device, after a delay of a first predetermined time period, stopping driving the pickup roller, driving the delivery roller to rotate in the first direction still, and driving the active roller to rotate in a third direction which is opposite to the second direction, to deliver the paper delivered from the delivery roller to the paper processing apparatus.