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US 6,603,944 B2Granted
Developing apparatus
AssigneeSharp Kabushiki Kaisha
InventorHiroshi Tatsumi
Life of this patent
Estimating the term…
Abstract
A developing apparatus designed to allow toner uniformly charged with a predetermined electric charge to be formed into a toner layer formed on a circumferential surface of a developing roller, and further to allow a good image to remain formed. In order to allow a proper amount of toner having a proper specific electric charge to deposit on the circumferential surface of the developing roller, the blade is bent at a bending angle of at least 45° while being positioned against the circumferential surface of the developing roller when displacement amount ΔL is at most plus 0.4 mm.
Claims28
A developing apparatus comprising:
- a developing roller for supplying non-magnetic single component toner deposited in a layered fashion on a circumferential surface of the developing roller to a surface of a photoreceptor by rotation of the developing roller at a predetermined speed;
- and
- a planar plate-like blade cantilevered at one end thereof, for regulating thickness of a toner layer by pressing a part of the other end of the blade against the circumferential surface of the developing roller,
- the other end of the blade being bent at a bending angle in a direction in which the other end of the blade is spaced apart from the circumferential surface of the developing roller, the bending angle being 45° or more,
- a bend of the other end of the blade being positioned downstream from a position which exists upstream by an amount between 0.0 to 1.0 mm from a tangent point, which is an intersection point at which the normal of the developing roller in a direction perpendicular to the blade intersects the circumferential surface of the developing roller, between the blade and the developing roller with respect to a direction of rotation of the circumferential surface of the developing roller.
2 more elements
A developing apparatus comprising:
- a developing roller for supplying non-magnetic single component toner deposited in a layered fashion on a circumferential surface of the developing roller to a surface of a photoreceptor by rotation of the developing roller at a predetermined speed;
- and
- a planar plate-like blade cantilevered at one end thereof, for regulating thickness of a toner layer by pressing a part of the other end of the blade against the circumferential surface of the developing roller,
- the other end of the blade being bent at a bending angle in a direction in which the other end of the blade is spaced apart from the circumferential surface of the developing roller, the bending angle being 45° or more,
- a bend of the other end of the blade being positioned downstream by an amount of 0.0 to 1.0 mm from a tangent point, which is an intersection point at which the normal of the developing roller in a direction perpendicular to the blade intersects the circumferential surface of the developing roller, between the blade and the developing roller with respect to a direction of rotation of the circumferential surface of the developing roller.
2 more elements
A developing apparatus comprising:
- a developing roller for supplying non-magnetic single component toner deposited in a layered fashion on a circumferential surface of the developing roller to a surface of a photoreceptor by rotation of the developing roller at a predetermined speed;
- and
- a planar plate-like blade cantilevered at one end thereof, for regulating thickness of a toner layer by pressing a part of the other end of the blade against the circumferential surface of the developing roller,
- the other end of the blade being bent at a bending angle in a direction in which the other end of the blade is spaced apart from the circumferential surface of the developing roller, the bending angle being 45° or more,
- a bend of the other end of the blade being positioned downstream from a position which exists upstream by an amount of 0.4 mm from a tangent point, which is an intersection point at which the normal of the developing roller in a direction perpendicular to the blade intersects the circumferential surface of the developing roller, between the blade and the developing roller with respect to a direction of rotation of the circumferential surface of the developing roller.
2 more elements
A developing apparatus comprising:
- a developing roller for supplying non-magnetic single component toner deposited in a layered fashion on a circumferential surface of the developing roller to a surface of a photoreceptor by rotation of the developing roller at a predetermined speed;
- and
- a planar plate-like blade cantilevered at one end thereof, for regulating thickness of a toner layer by pressing a part of the other end of the blade against the circumferential surface of the developing roller,
- the other end of the blade being bent at a bending angle in a direction in which the other end of the blade is spaced apart from the circumferential surface of the developing roller, the bending angle being 45° or more,
- a bend of the other end of the blade being positioned downstream from a position which exists upstream by an amount of 0.5 to 1.0 mm from a tangent point, which is an intersection point at which the normal of the developing roller in a direction perpendicular to the blade intersects the circumferential surface of the developing roller, between the blade and the developing roller with respect to a direction of rotation of the circumferential surface of the developing roller.
2 more elements
A developing apparatus comprising:
- a developing roller for supplying non-magnetic single component toner deposited in a layered fashion on a circumferential surface of the developing roller to a surface of a photoreceptor by rotation of the developing roller at a predetermined speed;
- and
- a planar plate-like blade cantilevered at one end thereof, for regulating thickness of a toner layer by pressing a part of the other end of the blade against the circumferential surface of the developing roller,
- the other end of the blade being bent at a bending angle in a direction in which the other end of the blade is spaced apart from the circumferential surface of the developing roller, the bending angle being 45° or more,
- a bend of the other end of the blade being positioned downstream from a position which exists upstream by an amount of 0.8 to 1.0 mm from a tangent point, which is an intersection point at which the normal of the developing roller in a direction perpendicular to the blade intersects the circumferential surface of the developing roller, between the blade and the developing roller with respect to a direction of rotation of the circumferential surface of the developing roller.
2 more elements
Dependencies are inferred from the claim text.