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US 10,591,844 B2Granted
Development device and image forming device
AssigneeHewlett-Packard Development Company, L.P.
InventorYuya Kato
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes a developer carrying body to transfer developer to a photosensitive body. The developer carrying body has an outer circumference and grooves spaced apart along the outer circumference. The grooves occupy 27% or more of the outer circumference. The developing carrying body is rotatable in a rotational direction that imparts the developing carrying body with a direction of movement that is opposite to a direction of movement of the photosensitive body, at a position between the developer carrying body and the photosensitive body.
Claims14
A developing device comprising:
- a developer container to contain a developer comprising toner and carrier;
- a stir-and-transfer member to transfer the developer contained in the developer container while stirring;
- and
- a developer carrying body spaced apart from a photosensitive body that is to form an electrostatic latent image, the developer carrying body to supply the photosensitive body with the developer,
- wherein the developer carrying body is rotatable in a rotational direction that causes a direction of movement of the photosensitive body to be opposite to a direction of movement of the developer carrying body at a position between the photosensitive body and the developer carrying body,
- wherein the developer carrying body has an outer circumferential surface that comprises grooves arrayed along a circumferential direction of the developer carrying body,
- wherein the grooves occupy approximately 27% or more of an entire outer circumference of the developer carrying body assuming the grooves are not present, and
- wherein a distance between two adjacent grooves, among the grooves, in the circumferential direction is 650 μm or less.
5 more elements
A developing device comprising:
- a developer container to contain a developer comprising toner and carrier;
- a stir-and-transfer member to transfer the developer contained in the developer container while stirring;
- and
- a developer carrying body spaced apart from a photosensitive body to form an electrostatic latent image, the developer carrying body to supply the photosensitive body with the developer,
- wherein the developer carrying body is rotatable about a rotational axis, to impart the developer carrying body with a direction of movement that is opposite to a direction of movement of the photosensitive body, at a position between the photosensitive body and the developer carrying body,
- wherein the developer carrying body has an outer circumferential surface that comprises grooves arrayed along a circumferential direction of the developer carrying body,
- wherein the grooves occupy 27% or more of an entire outer circumference of the developer carrying body assuming the grooves are not present, and
- wherein the grooves comprise a first groove and a second groove adjacent the first groove, wherein when a first line is provided to connect a circumferential midpoint of the first groove with a center of a cross section of the developer carrying body that is orthogonal to the rotational axis and when a second line is provided to connect a circumferential midpoint of the second groove with the center of the cross section, the first line and the second line form an angle of 4° or less.
5 more elements
An imaging apparatus comprising:
- a developing carrying body to transfer developer to a photosensitive body, the developing carrying body having an outer circumference and grooves spaced apart along the outer circumference of the developing carrying body, wherein the outer circumference is associated with a maximum radius of a cross section of the developing carrying body including the grooves, wherein the grooves are recessed relative to the outer circumference, and wherein the grooves occupy 27% or more of the outer circumference,
- the developing carrying body to rotate in a rotational direction that imparts the developing carrying body with a direction of movement that is opposite to a direction of movement of the photosensitive body, at a position between the developer carrying body and the photosensitive body,
- the grooves are spaced apart where each of the grooves is associated with a circumferential midpoint at a center of the groove along the outer circumference of the developing carrying body, and wherein a distance along the outer circumference between two circumferential midpoints associated with two adjacent grooves is approximately 650 μm or less.
Dependencies are inferred from the claim text.