Timing adjustment in a copying machine

Claim 1

A timing adjustment system for a copying machine comprising: a slit plate secured to a shaft of a photosensitive drum of the machine, said slit plate having a plurality of slits formed with a predetermined distance therebetween; detection means for detecting said slits formed in said slit plate and for developing slit detection pulses of a period (t') when said slit plate rotates; optical system start detecting means for developing an optical system start signal when an optical system of the machine starts its movement; memory means for memorizing a desired delay time from the development of said optical system start signal to a supply timing of a copy paper, said memory means including: a first memory section for memorizing a pulse number (N 0 ) of the slit detection pulses; a second memory section for memorizing a time period (T 0 ) from the development of the N 0 -th slit detection pulse to the supply timing of the copy paper; mode selection means for selectively placing the copying machine in a preset mode; input means for modifying said pulse number (N 0 ) to a modified pulse number (N 1 ) and for modifying said time period (T 0 ) to a modified time period (T 1 ), in said preset mode to take into account actual operating conditions of said copy machine; and control means, responsive to said input means, for developing a control signal and for performing the copy paper supply when said desired delay time, equalling N 1 ·t'+T 1 , has passed after the development of said optical system start signal.