Abstract: A sheet size detecting apparatus includes a rotary member for conveying a sheet rotation detector together with the rotary member for generating a pulse, a sheet size measurement control device including an arm provided in a vicinity of the rotary member to effect reciprocally rocking by the passing of the front end and the rear end of the sheet. The sheet size measurement control device measures the size of the sheet by counting pulses generated by the rotation detector means in response to the rocking of the arm and, adds a correction value to the measured sheet size according to the conveying speed of the sheet.

Abstract: An original pressing device for use in a reading apparatus. There is a hinge together with a pressing unit supported pivotably by the hinge and pivoting between a closing position where an original on a platen is pressed and an opening position where the original is released. A coil spring is compressed with the closing operation of the pressing unit and is released from the compression along with the opening operation of the pressing unit, and a fluid damper is arranged within a hollow portion of the coil spring to provide a resistance force when the pressing unit performs the closing operation.