Patent ID: 7308227

Claim:
A paper arranging apparatus, comprising: a driving roller and an idle roller forming a nip therebetween; a shutter connected to a rotary shaft to arrange a sheet of paper by contacting a front edge portion of the paper before the front edge portion of the paper enters the nip, and to rotate after being pushed by the front edge portion of the paper to not interrupt the movement of the paper; a flag connected to the rotary shaft of the shutter to rotate in a same direction and at a same rotating angle as the shutter; and a sensor sensing position variations of the rotating flag and generating a signal representing a position of the paper being conveyed, wherein the rotary shaft of the shutter is positioned to return the shutter to an initial position by rotating in the opposite direction due to the weight of the shutter after the paper has passed through the nip of the roller, an axis of rotation of the shutter rotary shaft being spaced from axes of rotation of the driving and idle rollers.