Patent ID: 6868240
Filing Date: 2005-03-15
Classification: G03G

Abstract:
1. A method for developing in a hybrid developing apparatus having a magnetic roll for transferring two-component developer material, which electrostatically charges developer material consisting of carrier and toner magnetically held thereon, and a developing roll, which forms a toner thin layer on its surface by transferring the toner utilizing a bias for transferring and magnetic brushes of the magnetic roll wherein latent images on a latent image bearing body are developed with the toner by applying developing bias to nearest approached regions developing regions, between the developing roll and the latent image bearing body, characterized in that amount of data of each image, which an image forming apparatus prints and a number of paper sheets passed are detected and that an interval of the action of recovering and exchanging a toner layer on the developing roll to the magnetic roll after printing between paper sheets is variably set in accordance with a printing coefficient determined by the data amount and the number of paper sheets passed.