Copy paper delivery timing control device

Claim 1

A copy paper delivery timer control device in an electrophotographic copying machine comprising: scanner means for optically scanning an original document at variable speeds according to a selected magnification ratio, said scanner means being movable from a home position past leading and trailing edges of the original document, said document having first and second portions defined by a dividing line intermediate said leading and trailing edges, wherein said first portion extends from said leading edge to said dividing line and said second portion extends from said dividing line to said trailing edge; home position sensing means for detecting when said scanner means is in said home position; pulse generating means for generating a predetermined number of pulses representing the travelling distance of said scanner means from said home position to said leading edge and from said home position to said dividing line intermediate said leading and trailing edges, respectively; counter means for counting said predetermined number of pulses produced by said pulse generating means from said home position to said leading edge and from said home position to said dividing line; copy paper delivery means for delivering copy paper from a paper feed location to an image transfer location, wherein said image transfer location begins the point at which either a first or second portion of an optically scanned original document image is transferred to said copy paper; timer means, independently operable of said counter means, for determining an amount of time required for said document image to reach said image transfer location and for separately determining an amount of time required for said copy paper to reach said image transfer location from said paper feed location; means for aligning a tip position of said first document image portion with a tip position of said copy paper at said image transfer location, wherein the amount of time required for said copy paper to reach said image transfer location is substracted from the amount of time required for said document image to reach said image transfer location subsequent to counting said predetermined number of pulses generated by said scanning means from said home position to said leading edge.