Patent ID: 7801470
Filing Date: 2010-09-21
Classification: G03G

Abstract:
1. A developing apparatus for forming a toner image on an image carrying member via a donor member, comprising: the donor member structured in an endless belt shape and arranged to face the image carrying member so that a developing region with a developing gap is formed between the donor member and the image carrying member; a developer supporting member to carry developer including toner and magnetic carrier and to form a toner layer on the donor member; a first supporting member arranged in the inside of the donor member with a predetermined gap against the developer supporting member; a second supporting member arranged in the inside of the donor member with a predetermined gap against the developer supporting member; a toner supply bias applying section to apply onto the first supporting member a toner supply bias for supplying toner from the developer supporting member to the donor member; a toner recovery bias applying section to apply onto the second supporting member a toner recovery bias for recovering toner from the donor member to the developer supporting member; and a separating member to separate the donor member from the developer supporting member, being arranged between a toner supply position where toner is supplied from the developer supporting member to the donor member and a toner recovery position where toner is recovered from the donor member to the developer supporting member; wherein the donor member is wound around the first supporting member and the second supporting member such that a toner supply gap is formed between the developer supporting member and the donor member at a position on the first supporting member and a toner recovery gap is formed between the developer supporting member and the donor member at a position on the second supporting member.