Abstract: A copy paper supply timing control system includes a slit plate secured to a shaft of a photo-sensitive drum for developing a pulse signal of a period (t') in response to the rotation of the photo-sensitive drum. A copy paper supply system is enabled when a predetermined time has passed after an optical system initiates its movement. The predetermined time is determined by a number (N) of the pulse signals and a time period (T) from the development of the N-th pulse signal. That is, the actual copy paper supply is conducted when (N.times.t'+T) have passed after the optical system initiated its movement. The copy paper supply timing control system includes a compensation system for modifying the pulse number (N) and the time period (T) in response to a detected period (t) between the initiation of the optical system movement and the development of the first pulse signal.

Abstract: An auto paper selector suitable for a copying machine comprises a first and second paper supply sections to which a first and second cassettes storing papers are attached, respectively, a first and second paper extracting devices for extracting the papers from the first and second cassettes, respectively, the first and second paper extracting devices being positioned at the first and second paper supply sections, respectively, and a selecting circuit responsive to the new attachment of either the first cassette or the second cassette for activating either the first paper extracting device or the second paper extracting device, respectively.