Development apparatus and image forming apparatus

An image forming apparatus, comprising:

• an image holding member;
• a charging unit that charges the surface of the image holding member;
• an exposure unit that exposes the surface of the image holding member charged by the charging unit, thus forming a latent image;
• a development apparatus comprising:
• a first developer storage container and a second developer storage container that store developer, the first developer storage container having a first opening and a second opening, so that the first developer storage container and the second developer storage container are in communication;
• a first transport member that is provided within the first developer storage container, and that by rotating around a center of rotation, while transporting developer stored in the first developer storage container, causes the developer to move to the second developer storage container via the first opening;
• a second transport member that is provided within the second developer storage container, and that by rotating around a center of rotation, while transporting developer stored in the second developer storage container, causes the developer to move to the first developer storage container via the second opening;
• a developer holding member that holds developer supplied from the first developer storage container or the second developer storage container, and performs development by causing the developer to move to a position facing an image holding body on which a latent image is formed;
• and
• a moving member that is provided so as to fit between an inner wall face of the second developer storage container and an outer edge of the second transport member, and is moved between a first position where the second opening is covered and a second position where the second opening is not covered, and when moved to the second position, covers the inner wall face, viewed from the lowermost position in the second developer storage container, on the downstream side in the direction of rotation of the second transport member and on the side below the center of rotation of the second transport member in the direction of gravity,
• a transfer unit that transfers an image developed by the development apparatus to a recording medium;
• and
• a fixing unit that fixes the image transferred to the recording medium by the transfer unit.

A development apparatus, comprising:

• a first developer storage container and a second developer storage container that store developer;
• the first developer storage container having a first opening and the second developer storage container having a second opening, so that the first developer storage container and the second developer storage container are in communication;
• a first transport member that is provided within the first developer storage container, and while transporting developer stored in the first developer storage container, causes the developer to move to the second developer storage container via the first opening;
• a second transport member that is provided within the second developer storage container, and while transporting developer stored in the second developer storage container, causes the developer to move to the first developer storage container via the second opening;
• a discharge port that is provided in the second developer storage container at, viewed from the position of the second opening, a position on the opposite side from the first opening, and discharges a portion of the developer stored in the second developer storage container to outside of the development apparatus;
• and
• a developer holding body that holds developer supplied from the first developer storage container or the second developer storage container, and performs development by causing the developer to move to a position facing an image holding body on which a latent image is formed;
• wherein the second developer storage container has a discharge region for discharging developer from the discharge port, the discharge region including the position where the discharge port is provided, and
• in a first portion of the discharge region between the discharge port and the second opening, the volume between the second developer storage container and the second transport member is less than the volume in portions of the discharge region other than the first portion of the discharge region between the discharge port and the second opening.