Copying machine with electromechanical scavenger assembly and process

摘要

In an electrostatic copying method and apparatus employing a two-component image-developer composition comprising magnetizable carrier particles and toner pigment particles, the removal of magnetizable carrier particles from the photoconductive surface is accomplished by means of an electromechanical scavenger assembly comprising a movable magnet and a fixed non-magnetizable shield mounted in close association between said magnet and the photoconductive surface. During the copying cycle, the magnet is moved adjacent the fixed shield to create a strong magnetic field around the shield and to cause magnetizable articles to be drawn against the shield from the photoconductive surface. After the copying cycle, the magnet is moved away from the fixed shield to withdraw the strong magnetic field from the shield, causing the magnetizable particles to fall from the shield into a collection tray by means of gravity.