Patent ID: 8472845
Filing Date: 2013-06-25
Classification: G03G

Abstract:
1. A developing device, which is attached to an electrophotographic type image forming apparatus having a photosensitive drum on which an electrostatic latent image is formed, comprising: a developer tank housing a developer including a toner and a carrier; a toner replenishment port for replenishing a toner into the developer tank; a developing roller that is provided in the developer tank and supplies the toner to a surface of the photosensitive drum formed with the electrostatic latent image while bearing the developer and rotating; a developer conveying path having a first developer conveying path and a second developer conveying path on a side of the developing roller in which the first and second developer conveying paths are partitioned by a partition wall parallel with an axial direction of the developing roller, and a connecting path for connecting the first and second developer conveying paths at both sides of the axial direction; a conducting plate for peeling a recovery developer on the surface of the developing roller after the toner is supplied to the photosensitive drum from the surface of the developing roller so as to guide the recovery developer to the first developer conveying path; and first and second developer conveying members arranged on the first and second developer conveying paths, wherein the first developer conveying member has a cylindrical hollow rotating shaft with opened both ends that is rotatably provided to the first developer conveying path, and divides the first developer conveying path into an external first developer conveying path and an internal first developer conveying path, an external spiral blade fixed to an outer periphery of the hollow rotating shaft, and an internal spiral blade fixed to an inner periphery of the hollow rotating shaft, a direction where the developer is conveyed by the external spiral blade is the same as a direction where the developer is conveyed by the second developer conveying member and is opposite to a direction where the developer is conveyed by the internal spiral blade.