Abstract: A coil spring 60 is provided in an empty room (inside of a fixing roller 50) of a main body 52 of a roller. The coil spring 60 is in contact with an inside wall 52a surrounding the empty room of the roller main body 52 and pushes the inside wall 52a outward. The coil spring 60 and the inside wall face 52a are coated with a black film 66 except the contact portion 62 of the coil spring 60 and the inside wall 52a.

Abstract: A coil spring 60 is provided in an empty room (inside of a fixing roller 50) of a main body 52 of a roller. The coil spring 60 is in contact with an inside wall 52a surrounding the empty room of the roller main body 52 and pushes the inside wall 52a outward. The coil spring 60 and the inside wall face 52a are coated with a black film 66 except the contact portion 62 of the coil spring 60 and the inside wall 52a.

Abstract: A coil spring 60 is provided in an empty room (inside of a fixing roller 50) of a main body 52 of a roller. The coil spring 60 is in contact with an inside wall 52a surrounding the empty room of the roller main body 52 and pushes the inside wall 52a outward. The coil spring 60 and the inside wall face 52a are coated with a black film 66 except the contact portion 62 of the coil spring 60 and the inside wall 52a.

Abstract: An image forming apparatus includes a housing, a toner hopper, a toner supply source, a magnetic roller, a development sleeve, a doctor blade, an agitator, a rotation arm provided in the agitator, a spoon formed on the tip of the rotation arm, a toner shelf arranged immediately below the development sleeve, a developer returning member provided between the doctor blade and the toner hopper, and a weir for guiding the toner and magnetic carrier cut and removed when the developer returning member returns the toner to the toner shelf. The weir has a top portion equal to or higher than the spoon surface when the rotation arm is horizontal. A space for passing through toner is formed between the weir and the developer returning member.

Abstract: An image forming apparatus comprises a housing, a toner hopper, a toner supply source, a magnetic roller, a development sleeve, a doctor blade, an agitator, a rotation arm provided in the agitator, a spoon formed on the tip of the rotation arm, a toner shelf arranged immediately below the development sleeve, a developer returning member provided between the doctor blade and the toner hopper, and a weir for guiding the toner and magnetic carrier cut and removed when the developer returning member returns the toner to the toner shelf. The weir has a top portion equal to or higher than the spoon surface when the rotation arm is horizontal. A space for passing through toner is formed between the weir and the developer returning member.

Abstract: Disclosed is a two-component developing agent comprising toner which includes a second magnetic powder added in an amount of 4 wt % or less with respect to the weight of toner particles which contains a first magnetic powder and a binder resin, and manganese-magnesium-based carrier.

Abstract: An image forming apparatus of the present invention includes a developing device for forming a developed image by transferring a developing agent to an electrostatic latent image formed on a photosensitive drum, a developing agent recycling mechanism for returning the developing agent recovered from the photosensitive drum by a cleaning device to the developing device after transferring the developed image formed on the photosensitive drum on a sheet paper, and a contact member for adsorbing impurities contained in the developing agent returned by the recycling mechanism by an adsorbing voltage having a voltage and polarity defined based on the charged polarity of the developing agent and the developing bias voltage applied to the developing roller and the developing agent of the developing device.