Process cartridge and image forming apparatus having the same

A process cartridge usable with an image forming apparatus, comprising:

• a developing member;
• a photosensitive medium to face the developing member;
• a pair of supporting plates to rotatably support the developing member and the photosensitive medium;
• a center moving member rotatably disposed on the supporting plate, the center moving member causing the photosensitive medium to locate either at a first position in which the photosensitive medium contacts the developing member or at a second position in which the photosensitive medium is spaced apart from the developing member;
• and
• a separation restraining member formed so that when the center moving member locates at the second position, the separation restraining member restrains the center moving member from escaping from the second position, the separation restraining member having a guiding groove to limit a rotation range of the center moving member,
• wherein when the process cartridge is separated from the image forming apparatus, the center moving member is moved over the separation restraining member and to the first position by a position changing member of the image forming apparatus.

A process cartridge usable with an image forming apparatus, comprising:

• a developing member;
• a photosensitive medium to face the developing member;
• a pair of supporting plates to rotatably support the developing member and the photosensitive medium;
• a center moving member rotatably disposed on the supporting plate, the center moving member causing the photosensitive medium to locate either at a first position in which the photosensitive medium contacts the developing member or at a second position in which the photosensitive medium is spaced apart from the developing member;
• and
• a separation restraining member formed so that when the center moving member locates at the second position, the separation restraining member restrains the center moving member from moving from the second position, the separation restraining member having a guiding groove to limit a rotation range of the center moving member,
• wherein when the process cartridge is installed along a guide rail of the image forming apparatus, the center moving member moves over the separation restraining member and to the first position.

An image forming apparatus, comprising:

• a main body;
• a process cartridge removably disposed in the main body, the process cartridge comprising:
• a developing member;
• a photosensitive medium to face the developing member;
• a pair of supporting plates to rotatably support the developing member and the photosensitive medium;
• a center moving member rotatably disposed on the supporting plate, the center moving member having a first position in which the photosensitive medium contacts the developing member and a second position in which the photosensitive medium is spaced apart from the developing member;
• and
• a separation restraining member formed so that when the center moving member locates at the second position, the separation restraining member restrains the center moving member from moving from the second position, the separation restraining member having a guiding groove to limit a rotation range of the center moving member;
• and
• a position changing member disposed in the main body so that when the process cartridge is separated from the main body, the position changing member causes the center moving member at the second position to move over the separation restraining member to the first position.

An image forming apparatus, comprising:

• a main body;
• guide rails formed on opposite side surfaces of the main body;
• and
• a process cartridge removably disposed along the guide rails,
• wherein the process cartridge comprises:
• a developing member;
• a photosensitive medium to face the developing member;
• a pair of supporting plates to rotatably support the developing member and the photosensitive medium;
• a center moving member rotatably disposed on the supporting plate, the center moving member having a first position in which the photosensitive medium contacts the developing member and a second position in which the photosensitive medium is spaced apart from the developing member;
• and
• a separation restraining member formed so that when the center moving member locates at the second position, the separation restraining member restrains the center moving member from escaping from the second position, the separation restraining member having a guiding groove to limit a rotation range of the center moving member;
• and
• wherein when the process cartridge is installed into the main body along the guide rails, the center moving member moves from the second position to the first position over the separation restraining member.