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Development of Electrostatic Images

IP.com Disclosure Number: IPCOM000098892D
Original Publication Date: 1958-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Schaffert, RM: AUTHOR

Abstract

In this inking system for electrostatic printing, a toner, containing magnetic pigment, is fed by brush 1 onto a magnetized surface 2 electrically charged by corona charging unit 3, and then conveyed to the surface of an electrographic drum 4 on which an electrostatic image 5 appears.

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Development of Electrostatic Images

In this inking system for electrostatic printing, a toner, containing magnetic pigment, is fed by brush 1 onto a magnetized surface 2 electrically charged by corona charging unit 3, and then conveyed to the surface of an electrographic drum 4 on which an electrostatic image 5 appears.

By virtue of an imbalance existing between the electrostatic force and the force of the magnetized surface, the toner particles in the zone of image attraction will transfer to the drum. In the regions where no electrostatic field force is found, the particles remain on the magnetized surface. A particular type of toner may involve an iron oxide coated with a resin. The magnetic surface may be in the form of a drum or a belt. The force of magnetic attraction can be adjusted by controlling the current, through a magnetizing head 6.

Print suppression could be attained by de-magnetizing with head 7 corresponding areas on the magnetic surface so that these de-magnetized areas will not attract toner and consequently no toner will be carried to the xerographic drum surface corresponding to these areas. Print suppression could also be accomplished by over-magnetizing selected areas of the surface so that toner would be held so tightly by magnetic attraction in the selected areas that none would be deposited on the corresponding areas of the electrographic drum.

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