Patent ID: 8827263

Claim:
A paper feeding mechanism, comprising: a mechanical frame; a drive assembly mounted to the mechanical frame; an input tray, a front end of the input tray being pivoted to the mechanical frame and a rear end of the input tray swinging upward around the front end of the input tray to be raised up a distance from the mechanical frame; a pickup assembly driven by the drive assembly; an elevating assembly mounted to the mechanical frame and pivoted to a bottom of the rear end of input tray, the elevating assembly including a drive shaft mounted to the mechanical frame with one end thereof connecting with the drive assembly and driven by the drive assembly, a gear assembly connecting with the drive shaft, a rotating shaft driven by the gear assembly to rotate and located under the input tray, and an elastic element, the rotating shaft defining two cam parts projecting beyond the rotating shaft, the rotating shaft rotating to make the cam parts selectively press downward on and separate from the input tray so as to drive the input tray to respectively swing downward or swing upward under an elastic push action of the elastic element; wherein the gear assembly is mounted to a side of the mechanical frame, the gear assembly includes an actuating gear mounted to the drive shaft, a drive gear engaging with the actuating gear, a swing arm coaxially pivoted about the drive gear, a spindle gear connecting with the swing arm and engaging with the drive gear, and a torsion spring mounted between the swing arm and the spindle gear, wherein the drive gear is coaxial with the rotating shaft; and a control assembly including a control system and a paper sensor controlled by the control system for detecting whether there is any paper on the input tray, the control assembly controlling the drive assembly to drive the elevating assembly to rise or descend so as to bring along the input tray to swing upward or downward and drive the pickup assembly to pick up the paper or stop picking up the paper.