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US 6,321,056 B1Granted
Developing device for an image forming apparatus
AssigneeRicoh Company, Ltd.
InventorNobuo Takami
Life of this patent
Estimating the term…
Abstract
A developing device for an image forming apparatus of the present invention is capable of implementing double regulation on the amount of a developer with a first regulating member and second regulating members. The second regulating members, having inclined portions, are positioned upstream of opposite ends of the first regulating member in the direction of developer conveyance. It is therefore possible to obviate the adhesion of the developer at the opposite ends of the first regulating member. Further, a magnetic force is weakened at the opposite ends of a developer carrier adjoining the first regulating member for the same purpose.
Claims51
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer wherein at least one of said regulating members includes an inclined portion inclined towards an inside portion of the developing region.
2 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein said second regulating members are formed of a magnetic material, and wherein said second regulating members each include an edge facing said developer carrier and include an inclined portion inclined toward an inside of the developing region.
3 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein said second regulating members are formed of a magnetic material, and wherein said second regulating members each include an edge facing said developer carrier and include a curved portion curved toward an inside of the developing region.
3 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein portions of said second regulating members facing said developer carrier are formed of a magnetic material;
- wherein said second regulating members each extend over a boundary between an end of the developing region and an outside of said developing region;
- and
- wherein said second regulating members each include an edge facing said developer carrier and include an inclined portion inclined toward an inside of the developing region.
6 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein portions of said second regulating members facing said developer carrier are formed of a magnetic material;
- wherein said second regulating members each extend over a boundary between an end of the developing region and an outside of said developing region;
- and
- wherein said second regulating members each include an edge facing said developer carrier and include a curved portion curved toward an inside of the developing region.
6 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein portions of said second regulating members facing said developer carrier are formed of a magnetic material;
- and
- wherein said second regulating members each include an edge facing said developer carrier and include an inclined portion inclined toward an inside of the developing region.
5 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer consisting of toner and carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein portions of said second regulating members facing said developer carrier are formed of a magnetic material;
- and
- wherein said second regulating members each include an edge facing said developer carrier and include a curved portion curved toward an inside of the developing region.
5 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein portions of said second regulating members facing said developer carrier are formed of a magnetic material;
- wherein said second regulating members each are located at a position where a magnetic force in a direction normal to said magnetized body is greater than said first regulating member and, wherein said second regulating members each include an edge facing said developer carrier and including an inclined portion inclined toward an inside of the developing region.
4 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited there on to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein said second regulating members each extend over a boundary between an end of the developing region and an outside portion of said developing region;
- and
- wherein said second regulating members each include an edge facing said developer carrier and including an inclined portion inclined toward an inside of the developing region.
5 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein said second regulating members each extend over a boundary between an end of the developing region and an outside portion of said developing region;
- and
- wherein said second regulating members each include an edge facing said developer carrier and include a curved portion curved toward an inside of the developing region.
5 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein said second regulating members each include an edge facing said developer carrier and include an inclined portion inclined toward an inside of the developing region.
3 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, said developing device comprising:
- a developer chamber for storing a developer comprising a toner and a carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- a first regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- and
- a pair of second regulating members respectively positioned upstream of opposite ends of said first regulating member in a direction in which said developer carrier conveys the developer;
- wherein said second regulating members each include an edge facing said developer carrier and include a curved portion curved toward an inside of the developing region.
3 more elements
A developing device for developing a latent image electrostatically formed on an image carrier, comprising:
- a developer chamber for storing a developer consisting of toner and carrier;
- a developer carrier accommodating a magnetized body therein for conveying the developer deposited thereon to a developing region where said developer carrier faces the image carrier;
- and
- a regulating member for regulating a thickness of the developer deposited on said developer carrier in a layer;
- wherein a magnetic force exerted by said magnetized body on said regulating member is weakened at opposite ends of said regulating member, said regulating member including an inclined portion inclined towards an inside portion of the developing region.
2 more elements
Dependencies are inferred from the claim text.