Cartridge, process cartridge and image forming apparatus

A cartridge detachably mounting to an image forming apparatus, the cartridge comprising:

• a toner chamber for accommodating a toner;
• and
• a toner supplying chamber, in which a developing roller is provided, said toner supply chamber having a toner supply opening communicating with said toner chamber;
• a feeding portion, including a rotatable member and a feeding sheet connected with the rotatable member, for feeding the toner from said toner chamber to said toner supply chamber;
• and
• a toner seal member including a first end portion connected with said feeding portion and a second end portion for sealing said toner supply opening,
• wherein said feeding portion is located below a powder surface of the toner with respect to a direction of gravitation if the cartridge is mounted to the image forming apparatus, and said feeding sheet is contactable to an inner wall of said toner chamber.