Patent ID: 7742736
Filing Date: 2010-06-22
Classification: B41J,G03G

Abstract:
1. A sheet size detecting apparatus comprising: a first arm moved by a moving sheet contacting therewith; a second arm moved by the moving sheet contacting therewith, said second arm being disposed at a location differing from that of said first arm in a direction orthogonal to the movement direction of the sheet; a sensor; and an actuator acting on said sensor, and wherein said actuator is not moved when only one of said first arm and said second arm is moved by the contact of the sheet, and is moved when both of said first arm and said second arm are moved by the contact of the sheet, wherein the output level of said sensor when only one of said first arm and said second arm has been moved is the same as the output level thereof when neither of said first arm and said second arm is moved, and the output level of said sensor when both of said first arm and said second arm have been moved differs from the output level thereof when neither of said first arm and said second arm is moved, and wherein said first arm has a first regulating portion for regulating the movement of said actuator, said second arm has a second regulating portion for regulating the movement of said actuator, and said actuator is moved only when both said first regulating portion and said second regulating portion are moved by the contact of said first arm and said second arm with the sheet.