Programmable controller for controlling reproduction machines

Abstract

A programmable controller is used to control the operation of a xerographic reproducing machine adapted to run in a simplex or duplex mode whereby copies are made on either or both sides of web material fed in a single pass and then cut into individual copy sheets. The interval between successive image reproduction or pitch cycles can be determined by the programmable controller in accordance with manually entered input signals. The time sequence of control signals regulating the processing steps are altered to accommodate the altered cycle interval. In order to minimize the effects of noise produced by the xerographic processing environment, control signals as well as input device instruction signals are sampled a multiplicity of times and a composite result is determined before the storing or the execution of signal instructions.