Patent ID: 8511667
Filing Date: 2013-08-20
Classification: B65H

Abstract:
1. An automatic document feeder, comprising: a paper pick-up device for transmitting a paper into said automatic document feeder; a first roller assembly located downstream of said paper pick-up device for transmitting said paper, and comprising: a second roller assembly located downstream of said first roller assembly for transmitting said paper, and comprising: wherein when said power coupling device is connected with said first shaft and said first roller, said first roller is driven to be rotated at a third speed by said first shaft, so that said paper is transmitted to said second roller, wherein said third speed is lower than said second speed, wherein when a front edge of said paper is moved to said second roller and said paper has not been completely departed from said first roller, said first roller is driven to be rotated at said second speed by said paper, so that a power connection between said first roller and said first shaft is released by said power coupling device, wherein after said paper is completely departed from said first roller and while said power connection between said first shaft and first roller is released, said first roller reaches a static status.