DEVICE FOR THE DEVELOPMENT OF AND ELECTROSTATIC CHARGE IMAGE

摘要

This invention relates to a device for the development of an electrostatic charge image on a moving support with the aid of a developing powder consisting of toner particles and magnetizable carrier particles, which device comprises a reservoir and a rotating magnetic roller, whereby the support moves substantially tangentially along the magnetic roller, characterized in that near the circumferential part of the magnetic roller where this moves towards the support, a partition is installed which together with the circumferential part mentioned forms a passage narrowing into the direction of the support, and in that a propelling organ is installed for propelling developing powder from the reservoir into the wider extremity of this passage. This device is useful as part of an electrostatic copier and has the advantage over those of the prior art in that the supply of developing powder to the developing zone is better controlled so that differences in image quality are reduced.