Developing device, and image forming apparatus using the same

摘要

There is provided a developing device including a toner holding member that is rotatably provided to face an image holding member and holds and transports a nonmagnetic single-component toner toward a development region to develop an electrostatic latent image on the image holding member, a supplying member that is rotatably provided in elastic contact with the toner holding member to supply the toner from a contact region therebetween to the toner holding member, a toner replenishing unit that faces a replenishment region at a portion apart from the contact region to replenish a new toner, and a regulating member that is provided on a downstream side of the contact region in a rotation direction thereof and on an upstream side of the development region to triboelectrically charge the toner held on the toner holding member and regulate the amount of toner provided for the development.

主权项

1. A developing device comprising:
a toner holding member that is rotatably provided to face an image holding member, which circulates while holding an electrostatic latent image, and holds and transports a nonmagnetic single-component toner toward a development region, which is opposed to the image holding member, so as to develop the electrostatic latent image on the image holding member; a supplying member that has a rough surface, on which the toner may be captured, on a circumferential surface of an elastic member which is elastically deformable, and is rotatably provided in elastic contact with the toner holding member so as to supply the toner from a contact region, which comes into contact with the toner holding member, to the toner holding member; a toner replenishing unit that contains new toner and faces a replenishment region at a portion apart from the contact region of the supplying member, which comes into contact with the toner holding member, so as to replenish the toner; and a regulating member that is provided on a downstream side of the contact region, which comes into contact with the supplying member, in the toner holding member in a rotation direction thereof and on an upstream side of the development region of the toner holding member in a rotation direction thereof so as to triboelectrically charge the toner held on the toner holding member and regulate the amount of toner provided for the development, wherein in the toner replenishing unit, a containing chamber, which contains the new toner such that the toner may be replenished, is connected to a developing chamber, in which the supplying member and the toner holding member are disposed, through a toner transporting path, wherein a developing chamber side opening of the toner transporting path is positioned below a containing chamber side opening of the toner transporting path, and is disposed to face a region under a rotation center of the supplying member, and wherein the supplying member rotates from a down side thereof toward an upper side thereof at a portion facing the developing chamber side opening of the toner transporting path.