Image forming apparatus

An image forming apparatus comprising:

• a cartridge that includes a roller and a portion-to-be-positioned;
• and
• an apparatus main body to which the cartridge is detachably attachable, the apparatus main body including:
• an opening through which the cartridge passes when the cartridge is attached to the apparatus main body;
• an opening and closing member configured to move between an opening position where the opening are not covered by the opening and closing member and a closing position where the opening is covered by the opening and closing member;
• a positioning portion for positioning the cartridge with respect to the apparatus main body by contacting with the portion-to-be-positioned of the cartridge;
• a first sandwiching portion configured not to move together with the opening and closing member;
• and
• a sandwiched unit including an elastic member and configured to move between a first position and a second position different from the first position, the first position being a position where the sandwiched unit is sandwiched between the first sandwiching portion and a second sandwiching portion of the cartridge, the second position being a position where the sandwiched unit is not sandwiched between the sandwiching portion and the second sandwiching portion of the cartridge, wherein when the sandwiched unit is in the first position, the sandwiched unit presses the second sandwiching portion of the cartridge by an elastic force of the elastic member so that the portion-to-be-positioned of the cartridge contacts with the positioning portion of the apparatus main body.

A cartridge detachably attachable to an apparatus main body of an image forming apparatus, the apparatus main body including an opening through which the cartridge passes when the cartridge is attached to the apparatus main body, an opening and closing member configured to move between an opening position where the opening are not covered by the opening and closing member and a closing position where the opening is covered by the opening and closing member, a positioning portion for positioning the cartridge, a first sandwiching portion configured not to move together with the opening and closing member, and a sandwiched unit movable between a first position and a second position different from the first position, the cartridge comprising:

• a roller;
• a frame;
• a portion-to-be-positioned that is to be contacted with the positioning portion of the apparatus main body to position the cartridge with respect to the apparatus main body;
• and
• a second sandwiching portion provided on the frame and configured to sandwich the sandwiched unit with the first sandwiching portion of the apparatus main body when the sandwiched unit is in the first position, the second sandwiching portion being a concave of the frame recessed toward the roller, the concave of the fame having a first surface and a second surface that face each other and extend so that a distance therebetween becomes smaller in a direction in which the concave of the frame is recessed,
• wherein the first surface and the second surface of the concave of the frame are configured to contact with the sandwiched unit when the cartridge is attached to the apparatus main body and the sandwiched unit is in the first position.