Patent ID: 8286964

Claim:
A paper suppressing device for a paper finishing apparatus including a stacker tray provided at one side of a paper protective plate to move up and down, a paper discharge device provided at an opposite side of the paper protective plate to align a paper and transfer the paper onto the stacker tray and the paper suppressing device interposed between the stacker tray and the paper discharge device, wherein the paper suppressing device comprises a clamp unit that is open while the paper is being transferred onto the stacker tray, and returns to an initial position after the paper has been transferred onto the stacker tray to suppress papers stacked onto the stacker tray, wherein the clamp unit includes a clamp holder shaft, a clamp installed on the clamp holder shaft, a crank arm rotating the clamp holder shaft by a predetermined angle to open the clamp fixed onto the clamp holder shaft, and a driving wheel driving the crank arm, a control mass fixed onto the clamp holder shaft and including a fixing member protruding from the clamp holder shaft perpendicularly to the clamp holder shaft, a pin provided perpendicularly to an end portion of the fixing member, and a lever protruding adjacent to the fixing member, wherein the crank arm has one end portion with a slit groove engaged with the pin of the control mass in such a manner that the pin is movable, and an opposite end portion eccentrically coupled with a rotational shaft of the driving wheel.