Patent ID: 8328184
Filing Date: 2012-12-11
Classification: B65H

Abstract:
1. A paper feeding mechanism, comprising: a mechanical frame; a drive system mounted to the mechanical frame; an input tray for holding papers thereon, a rear of the input tray being pivoted to the mechanical frame; a pickup assembly driven by the drive system and located above the input tray, the pickup assembly including a pickup roller, and a pickup wheel pivoted to one end of the pickup roller to wiggle upward and downward, the other end of the pickup roller being fastened to the mechanical frame for securing the pickup assembly to the mechanical frame; an elevating assembly mounted to the mechanical frame and driven by the drive system, the elevating assembly being pivoted to a bottom of the input tray and bringing along the input tray to rise and descend; and a controlling assembly including a controlling system, a paper sensor, a floating sensor and a pickup sensor, the paper sensor being mounted to the input tray with a top end thereof projecting beyond a top of the input tray to detect whether there are any papers on the input tray, the floating sensor being mounted to one side of the elevating assembly to detect a position of the elevating assembly, the pickup sensor being mounted to one side of the pickup assembly to detect a position of a bottom of the pickup wheel of the pickup assembly with respect to the papers on the input tray to get a total thickness of the papers located on the input tray, the controlling system controlling the drive system to drive the elevating assembly to wiggle upward and downward to bring along the input tray to rise and descend according to the total thickness of the papers located on the input tray, so as to make the pickup wheel of the pickup assembly pick up the papers on the input tray steadily.