Patent ID: 7946572
Filing Date: 2011-05-24
Classification: B65H

Abstract:
1. A paper pick-up mechanism, comprising: a transmission shaft rotated in a sheet-feeding direction and in a direction opposite to the sheet-feeding direction; a separation roller mounted on the transmission shaft and driven by the transmission shaft; a pick-up roller shaft, driven to rotate by the transmission shaft; a pick-up roller mounted on the pick-up roller shaft and driven by the pick-up roller shaft; a transmission gear shaft fixedly disposed between the transmission shaft and the pick-up roller shaft; a gear set comprising a separation roller gear coupled to the transmission shaft, a pick-up roller gear coupled to the pick-up roller shaft, and a transmission gear coupled to the transmission gear shaft, wherein the transmission gear meshes with the separation roller gear and the pick-up roller gear; a first one-way clutch, disposed on the transmission shaft; and a second one-way clutch disposed on the transmission gear shaft; wherein the pick-up roller and the separation roller are rotated in synchronism in the sheet-feeding direction, and wherein when the transmission shaft is rotated in the direction opposite to the sheet-feeding direction, the second one-way clutch constricts the motion of the transmission gear, and the transmission gear acts as a planet gear for the separation roller gear so that the pick-up roller shaft is synchronously lifted up.