Process and assembly to enhance accurate presentation of a paper sheet in a photocopying process

摘要

An electro-photographic printing machine employs a process to align and present a sheet of paper and especially to regulate the operation of a step motor as this advances the sheet towards the image transfer unit. The assembly has a motor (M1) which responds to motor control impulses (216). A drive unit (102) extends into the receiving unit, and a drive linkage (108,114) links the drive element (102) and motor (M1). A coding unit (200) generates a code impulse in response to image-carrier movement. An impulse generator (214) generates motor control impulses (216) in response to the code impulses (206), accelerating the receiver to about the same speed as the image-carrier (220). A timer mechanism (302) slows acceleration of the receiver to that of the image carrier (220).