DEVELOPING DEVICE Russian patent published in 2012 - IPC G03G15/08 

FIELD: printing industry.

SUBSTANCE: developing device, which includes conveying screws which in rotating carry out circulation of the developer and transport it in a container of the developer, the developing sleeve, which in rotating carries and transports the developer in the container of the developer, and a restrictive blade which limits the amount of developer in the developing sleeve, the container of the developer includes a chamber for feeding designed for feeding the developer on the developing sleeve, and the return chamber designed for returning of the developer from the developing sleeve, and the rotating speed of the conveying screws or a rotating speed of the developing sleeve changes so that the ratio Vsc/Vsl at a time when the image formation is not carried out, is less than the rotating speed at the time when the image formation is carried out, and Vsc represents the rotating speed of the conveying screws, and Vsl represents the rotating speed of the developing sleeve.

EFFECT: creation of the developing device made with the ability of stable maintaining thickness of the developer transported to the developing area for a long time, while eliminating the layer of toner from the following part of the restrictive blade located upstream before the toner layer grows.

6 cl, 12 dwg