Patent ID: 8152158

Claim:
An automatic document feeder for feeding a sheet, said automatic document feeder comprising: a top cover having a fixing structure and a first attracting element disposed on an inner surface thereof, wherein said first attracting element is installed on said fixing structure such that a floating gap is formed between said first attracting element and said fixing structure, wherein said fixing structure is an elongate fixing slice, and said first attracting element is sheathed around the elongate fixing slice; two position-retaining rings attached on said elongate fixing slice, wherein said first attracting element is arranged between said two position-retaining rings; a sheet pick-up module arranged under said inner surface of said top cover, and comprising a driving shaft and a sheet pick-up arm, wherein said driving shaft is installed on a main body of said automatic document feeder, said sheet pick-up arm is pivotally coupled to said driving shaft, and said sheet pick-up arm is rotatable to either a standby position or a sheet feeding position, wherein said sheet pick-up module feeds said sheet into an internal portion of the automatic document feeder when said sheet pick-up arm is rotated to said sheet feeding position; and a second attracting element disposed on said sheet pick-up arm, wherein said first attracting element and said second attracting element are attracted by each other when said sheet pick-up arm is rotated to said standby position, so that said sheet pick-up arm is fixed on said standby position.