Method for developing in hybrid developing apparatus

Abstract

To avoid developing ghost and selective developing without complicating a developing apparatus and to supply surly charged toner to a developing roll while unevenness of images is not generated to obtain stable images for a long time even when continuous printing, a method for developing in a hybrid developing apparatus is provided, which is characterized in that a data amount 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 and further, a method for developing in a color tandem-type image forming apparatus provided with a plurality of the hybrid developing apparatuses for all different colors of toner, which are disposed along the moving direction of a transfer medium of images is provided, wherein after toner layers on the developing rolls of the all developing apparatuses are peeled off toward the magnetic rolls after developing, a thickness of the toner layer of the each developing apparatus is variably controlled at the beginning of developing in accordance with the image consistency of the developing apparatus having a highest image consistency among image data of toner colors.