Patent ID: 9081331
Filing Date: 2015-07-14
Classification: G03G

Abstract:
1. A developing device comprising: a developing roller configured to include a magnet roller having numerous magnetic poles in a circumferential direction thereof and a roller-shaped developing sleeve sheathed on the magnet roller and to feed toner to a photosensitive drum; a regulating blade configured to extend in a rotation axis direction of the developing sleeve, disposed opposite to a circumferential surface of the developing sleeve, and configured to regulate a quantity of the toner present on the circumferential surface of the developing sleeve; seal members disposed opposite to the circumferential surface without being in contact with both ends of the developing region in the rotation axis direction on the circumferential surface of the developing sleeve, and configured to inhibit the toner on the developing region from moving to the rotation axis direction ends by magnetic brushes formed between the magnet roller and the seal members; and contact members, each configured as an edge on the developing region side in the rotation axis direction on an inner circumferential surface of each seal member which is opposite to the circumferential surface of the developing sleeve, provided at a position at an upstream side in a rotational direction of the circumferential surface of the developing sleeve relative to an arrangement position of the regulating blade, and configured to be in contact with the circumferential surface of the developing sleeve.