A sheet-feeding apparatus with a paper stopper includes a sheet-feeding base having a sheet-placing stand for placing sheets, a roller shell located on the sheet-feeding base having two side walls, a preliminary feeding roller unit and a feeding roller unit contained in the roller shell, a stopper member rotationally attached to the side wall of the roller shell and a follower member rotationally attached to the feeding roller unit and located at the downstream side of the stopper. Before starting a feeding operation, the stopper member is pushed by a sheet in the sheet-feeding base to move forward and presses on the follower member. The follower member would not move any further because the follower member is restricted by an upright wall of the sheet-feeding base.

A stopper member regulates the leading edges of sheets stacked on a sheet supply tray. In a first position of the stopper member, the sheets on a sheet supply tray are prevented from advancing into a paper feed path, and in a second position, the sheets drawn out by a draw-out device pass. The stopper member can be moved to a third position between the first and second positions. The displacement to the third position from the first position is associated with the lowering of the draw-out device for drawing out the sheets from the sheet supply tray, and the displacement from the third position to the second position is accomplished by the leading edge of a sheet drawn out by the draw-out device. This structure prevents damage to the original stacked on the sheet supply tray, and attains a simple structure and a low cost apparatus.

A sheet feeding apparatus for a printing device includes a pickup roller and a feeding roller picking up sheets loaded on a tray and feeding the sheets into a sheet feeding path, respectively, a rotation member installed on a rotation shaft of the feeding roller to support and rotate the pickup roller at a free end, a relay gear engaging the feeding roller and the pickup roller, a clutch unit selectively transferring a raising force of the rotation shaft to the rotation member, and a stopper installed in the rotation member to be elevated and lowered with respect to the rotation member to block a path between the pickup roller and the feeding roller. Accordingly, since the pickup roller is raised to allow the sheets to be loaded and then lowered after the sheets are loaded on the tray, front ends of the sheets are automatically inserted under the pickup roller. In addition, since the stopper aligns the sheets under the pickup roller when the sheets are pushed toward the feeding roller, the front ends of the sheets are prevented from being crumpled by the feeding roller.

A paper-feeding mechanism of an automatic document feeder includes a pick-up module, a supporting module and a paper stopping module. The pick-up module is used for picking an uppermost paper sheet from the stack of paper sheets and transporting the uppermost paper sheet into a passageway inside the automatic document feeder. The supporting module supports the pick-up module and is rotated to either ascend or descend the pick-up module, wherein the supporting module has a sustaining part on a sidewall thereof. When the supporting module and the pick-up module are downwardly rotated, the stopping plate is moved vertically to a paper-feeding position for allowing the uppermost paper sheet to be transported into the passageway. When the supporting module and the pick-up module are upwardly rotated, the stopping plate is moved vertically to a paper-stopping position for hindering the uppermost paper sheet from being transported into the passageway.

A modular single sheet feeder for feeding media sheets to a processing apparatus includes a chassis frame and a modular roller support and drive assembly pivotally supported on the frame for easy assembly. The roller support and drive assembly biases a roller frame which may be a replaceable bogie toward the media sheets to be fed and selectively positions the roller frame in a stack feeding position. A stack stop is provided for limiting the motion of the stack during manual loading and is automatically moved out of the media path as sheets are fed. Over engagement protection of the input gears and of the roller drive gears is also provided.