Image forming device and drum unit mounted to the same

摘要

An image forming device includes a photosensitive unit, a developing unit, and a positioning unit. The photosensitive unit is configured to support a photosensitive body. The developing unit includes a developer carrying body and a unit case. The positioning unit configured to adjust a positional relationship between the developer carrying body and the photosensitive body. The positioning unit includes a separating unit configured to separate the developer carrying body from the photosensitive body, and a high pressure unit configured to provide a high pressure contact between the developer carrying body and the photosensitive body. A pressure in the high pressure contact is higher than a pressure in a normal pressure contact. The normal pressure contact is such a pressure that the developer carrying body and the photosensitive body are held during a printing operation.

主权项

1. An image forming device comprising:
a photosensitive unit configured to support a photosensitive body; a developing unit including a developer carrying body and a unit case supporting the developer carrying body so as to expose a part of the developer carrying body, the developing unit being mounted to the photosensitive unit such that the developer carrying body is in confrontation with the photosensitive body; and a positioning unit configured to slide in a sliding direction to adjust a contact state between the developer carrying body and the photosensitive body, the positioning unit including a guide unit extending in the sliding direction, the guide unit comprising a separating portion configured to separate the developer carrying body from the photosensitive body, a normal pressure portion configured to provide a normal pressure contact between the developer carrying body and the photosensitive body, and a high pressure portion configured to provide a high pressure contact between the developer carrying body and the photosensitive body, a pressure in the high pressure contact being higher than a pressure in the normal pressure contact, the normal pressure contact being such a pressure that the developer carrying body and the photosensitive body are held during a printing operation, the separating portion extending in the sliding direction along a first plane, the normal pressure portion extending in the sliding direction along a second plane, wherein the second plane is positioned closer to an axis of the photosensitive body than is the first plane, the high pressure portion being positioned between the normal pressure portion and the separating portion in the sliding direction and protruding toward a photosensitive body side.