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Development of Electrostatic Images

IP.com Disclosure Number: IPCOM000098629D
Original Publication Date: 1959-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Medley, HC: AUTHOR

Abstract

The development of electrostatic images on the surface of a drum 10 is obtained by applying a development mixture of minute particles of electroscopic toner material and magnetic particles. The toner material may be ethyl cellulose resin and the magnetic particles are preferably globular to reduce the problem of small particles developing on the background area. The application is made in a series of successive wiping actions when the development mixture is cascaded successively onto a series of roller applicators 11 positioned in spaced apart relationship along the under surface of drum 10.

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Development of Electrostatic Images

The development of electrostatic images on the surface of a drum 10 is obtained by applying a development mixture of minute particles of electroscopic toner material and magnetic particles. The toner material may be ethyl cellulose resin and the magnetic particles are preferably globular to reduce the problem of small particles developing on the background area. The application is made in a series of successive wiping actions when the development mixture is cascaded successively onto a series of roller applicators 11 positioned in spaced apart relationship along the under surface of drum 10.

The roller applicators are preferably plastic drums with peripherally spaced powder metal magnet inserts 12. Wiping action occurs at each of the roller applicators due to the holding action of magnets 12 on the mixture in contact therewith and a net lineal speed between the roller applicators and the drum surface. Doctor blades 13 of nonmagnetic material are positioned between the roller applicators to remove the mixture therefrom after wiping action is complete.

The removed mixture will cascade over the doctor blade onto the succeeding rollers. Cascading is enhanced if the doctor blades have an

angle greater than the angle of repose of the development mixture. In cascading over the doctor blades, the developer material tends to become rearranged in preparation for the succeeding wiping action. The development mixture, removed from the last...