Abstract: A development powder dispensing apparatus that is in the form of a carousel. The apparatus has a generally cylindrical configuration that is divided into a number of chambers such that the development powder toner within each chamber may be supplied individually to a magnetic brush unit. Because of the separation of the toner into chambers, no toner compression is experienced even though large amounts of toner may be stored.

Abstract: An improvement in an electrophotocopying machine having a photoconductive surface and a retractable, pivotably mounted developer unit for developing an electrostatic image on the photoconductive surface. The improvement comprises at least one eccentric cam for moving said developer unit into and out of developing engagement with said photoconductive surface, said cam having a curved, cantilevered arm extending therefrom, said arm increasing the effective radius of said cam starting from the junction of the arm with the cam to the end of the arm remote from said junction, and means for reciprocally rotating said cam whereby said cam moves said developer unit into and out of developing engagement with said photoconductive surface.

Abstract: 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 electromagnetic scavenger assembly comprising an electromagnet and a fixed nonmagnetizable shield mounted in close association between said electromagnet and the photoconductive surface. During the copying cycle, the electromagnet is energized 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 electromagnet is automatically de-energized to discontinue the strong magnetic field in the area of the shield, causing the magnetizable particles to fall from the shield into a collection tray by means of gravity.

Abstract: 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.