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US 2012/0057904 A1Published application
Developing device and image forming apparatus
OwnerHiroyoshi MAEHARA, Takahiko Kimura +2inventors
InventorsHiroyoshi MAEHARA, Takahiko Kimura, Hiroshi Kubota, Teruyoshi Sudo
Life of this patent
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Abstract
A developing device includes a developing tank, a developing roller, a supply toner carrying path, and a supply toner diffusion screw. A partition board provided parallel to the developing roller in the developing tank has, in an axial direction of the supply toner diffusion screw, a first region and a second region lower than the first region. The first region is located so as to face a region perpendicularly below a toner supply opening, and the second region is located so as not to face the region perpendicularly below the toner supply opening.
Claims8
A developing device, comprising:
- a developing tank, which contains developer containing toner and magnetic carrier and which has a toner supply opening through which toner is supplied into the developing tank;
- a developing roller, provided in the developing tank, that bears the developer to supply the developer to a photoreceptor;
- a supply toner carrying path, provided in the developing tank, that (i) is separated from a region on a developing roller side by a partition board provided parallel to the developing roller, (ii) is provided longer than an opening length of the toner supply opening in a longitudinal direction of the toner supply opening, and (iii) receives the toner supplied through the toner supply opening;
- and
- a supply toner diffusion screw, provided in the supply toner carrying path, that (i) rotates to stir and diffuse supplied toner in the supply toner carrying path and (ii) moves, beyond the partition board, the supplied toner in the supply toner carrying path so as to supply the supplied toner to the region on the developing roller side,
- the partition board having, in an axial direction of the supply toner diffusion screw, a first region and a second region lower than the first region, the first region being located so as to face a region perpendicularly below the toner supply opening in the supply toner carrying path, and the second region being located so as not to face the region perpendicularly below the toner supply opening in the supply toner carrying path.
3 more elements
An image forming apparatus, comprising:
- a photoreceptor;
- a charging device for charging a surface of the photoreceptor;
- an exposure device for forming an electrostatic latent image by exposing the surface of the photoreceptor charged by the charging device;
- a developing device for forming a toner image by developing the electrostatic latent image formed on the surface of the photoreceptor;
- a toner supply device for supplying toner to the developing device;
- a transfer device for transferring the toner image formed on the surface of the photoreceptor onto a recording medium;
- and
- a fixing device for fixing the toner image, transferred onto the recording medium, to the recording medium,
- the developing device, including:
- a developing tank, which contains developer containing toner and magnetic carrier and which has a toner supply opening through which toner is supplied into the developing tank;
- a developing roller, provided in the developing tank, that bears the developer to supply the developer to a photoreceptor;
- a supply toner carrying path, provided in the developing tank, that (i) is separated from a region on a developing roller side by a partition board provided parallel to the developing roller, (ii) is provided longer than an opening length of the toner supply opening in a longitudinal direction of the toner supply opening, and (iii) receives the toner supplied through the toner supply opening;
- and
- a supply toner diffusion screw, provided in the supply toner carrying path, that (i) rotates to stir and diffuse supplied toner in the supply toner carrying path and (ii) moves, beyond the partition board, the supplied toner in the supply toner carrying path so as to supply the supplied toner to the region on the developing roller side,
- the partition board having, in an axial direction of the supply toner diffusion screw, a first region and a second region lower than the first region, the first region being located so as to face a region perpendicularly below the toner supply opening in the supply toner carrying path, and the second region being located so as not to face the region perpendicularly below the toner supply opening in the supply toner carrying path.
12 more elements
Dependencies are inferred from the claim text.