US 10,761,452 B2Granted

Developing device including a resin regulating blade

AssigneeCanon Kabushiki Kaisha

InventorsTomohiro Shiomi, Teruaki Tsurusaki, Shunichi Koga

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Abstract

When the area of a developing frame member corresponding to the maximum image area of an image bearing member is, in a section perpendicular to a rotational axis of a developing rotary member, divided by a straight line passing through the center of rotation of the developing rotary member and the center of rotation of the image bearing member and a perpendicular line passing through the center of rotation of a first conveying screw with respect to the straight line, a gate portion is provided at a bottom portion of the developing frame member in a divided area of the developing frame member not provided with the attachment portion, and a gate portion is not provided at the bottom portion of the developing frame member in a divided area of the developing frame member provided with the attachment portion.

Claims20

Dependent claims

A developing device comprising:

a developing rotary member configured to carry and convey a developer toward a position at which an electrostatic image formed on an image bearing member is developed;
a resin regulating blade arranged facing the developing rotary member, the regulating blade including a regulating portion for regulating an amount of the developer carried on the developing rotary member at a position closest to developer rotary member;
a resin developing frame member including an attachment portion for attachment of the regulating blade;
a first conveying screw arranged in a first chamber of the developing frame member in which the developer is supplied to the developing rotary member and configured to convey the developer of the first chamber in a first conveying direction;
and
a second conveying screw arranged in a second chamber of the developing frame member which is divided from the first chamber by a partition wall and configured to convey the developer of the second chamber in a second conveying direction as an opposite direction of the first conveying direction,
wherein the regulating blade is attached to the attachment portion in a state that the regulating blade is warped such that a gap between the developing rotary member supported on the developing frame member and the regulating blade attached to the attachment portion falls within a predetermined range along a rotational axis direction of the developing rotary member,
wherein the developing device comprises a portion corresponding to a maximum image region of the image bearing member with respect to the rotational axis direction of the developing rotary member, and
wherein in a case where the portion is partitioned into a part of the portion which has the regulating portion and a part of the portion which does not have the regulating portion by a first plane including a rotational axis of the developing rotary member and a rotational axis of the image bearing member, and
a part of the portion which has the regulating portion is partitioned into a first part and a second part by a second plane including a rotational axis of the first conveying screw and perpendicular to the first plain,
the first part does not have the attachment portion and has a gate portion, and
the second part has the attachment portion and does not have a gate portion.

9 more elements

A developing device comprising:

a developing rotary member configured to carry and convey a developer toward a position at which an electrostatic image formed on an image bearing member is developed;
a resin regulating blade arranged facing the developing rotary member, the regulating blade including a regulating portion for regulating an amount of the developer carried on the developing rotary member at a position closest to developer rotary member;
a resin developing frame member including an attachment portion for attachment of the regulating blade;
a first conveying screw arranged in a first chamber of the developing frame member in which the developer is supplied to the developing rotary member and configured to convey the developer of the first chamber in a first conveying direction;
and
a second conveying screw arranged in a second chamber of the developing frame member which is divided from the first chamber by a partition wall and configured to convey the developer of the second chamber in a second conveying direction as an opposite direction of the first conveying direction,
wherein the regulating blade is attached, with adhesive, to the attachment portion,
wherein the developing device comprises a portion corresponding to a maximum image region of the image bearing member with respect to a rotational axis direction of the developing rotary member, and
wherein in a case where the portion is partitioned into a part of the portion which has the regulating portion and a part of the portion which does not have the regulating portion by a first plane including a rotational axis of the developing rotary member and a rotational axis of the image bearing member, and
a part of the portion which has the regulating portion is partitioned into a first part and a second part by a second plane including a rotational axis of the first conveying screw and perpendicular to the first plain,
the first part does not have the attachment portion and has a gate portion, and
the second part has the attachment portion and does not have a gate portion.

9 more elements

A developing device comprising:

a developing rotary member configured to carry and convey a developer toward a position at which an electrostatic image formed on an image bearing member is developed;
a resin regulating blade arranged facing the developing rotary member, the regulating blade including a regulating portion for regulating an amount of the developer carried on the developing rotary member at a position closest to developer rotary member;
a resin developing frame member including an attachment portion for attachment of the regulating blade;
a first conveying screw arranged in a first chamber of the developing frame member in which the developer is supplied to the developing rotary member and configured to convey the developer of the first chamber in a first conveying direction;
and
a second conveying screw arranged in a second chamber of the developing frame member which is divided from the first chamber by a partition wall and configured to convey the developer of the second chamber in a second conveying direction as an opposite direction of the first conveying direction,
wherein the regulating portion is located below a rotational axis of the developing rotary member in a vertical direction,
wherein the developing device comprises a portion corresponding to a maximum image region of the image bearing member with respect to the rotational axis direction of the developing rotary member, and
wherein in a case where the portion is partitioned into a part of the portion which has the regulating portion and a part of the portion which does not have the regulating portion by a first plane including the rotational axis of the developing rotary member and a rotational axis of the image bearing member, and
a part of the portion which has the regulating portion is partitioned into a first part and a second part by a second plane including a rotational axis of the first conveying screw and perpendicular to the first plain,
the first part does not have the attachment portion and has a gate portion, and
the second part has the attachment portion and does not have a gate portion.

9 more elements

Dependencies are inferred from the claim text.