Automatic orgiinal sheet feeding apparatus

Claim 1

An automatic sheet feeder comprising: a sheet input section through which a stack of sheets are input; a take-in roller for feeding said sheets supplied to the sheet input section, in a predetermined direction; a take-out roller for further carrying said sheets fed by said take-in roller; a separation roller for separating said sheets carried by said take-out roller one from another; a press roller for pressing said sheets input to said sheet input section, forcibly on said take-in roller; a drive power source including a plunger for moving said press roller toward or away from said take-in roller; an operation piece, an end of which is connected to said plunger such that said operation piece rotates along with forward/backward movements of said plunger; a first urging member connected to the other end of said operation piece to apply a rotational force to said operation piece; a first link having an end connected to said operation piece via a securing pin, and the other end provided with a connecting pin; a second link having an end rotatably pivoted a shaft, said end provided with a pin receiver for receiving said connecting pin of said first link, and the other end provided with said press roller; a pin provided in a mid-portion of said second link; a second urging member stretched over said pin and said connecting pin of said first link so as to urge said press roller toward said take-in roller; and detecting means for sending an instruction for starting an operation to said take-in roller, take-out roller, and separation roller, upon detection of said sheet input to said sheet input section.