Developing device

A developing device comprising:

• a developer bearing member rotatably provided to bear a developer including a toner and a carrier for developing an electrostatic latent image formed on a rotatable image bearing member;
• a regulation blade made of resin and arranged to face the developer bearing member vertically under a position where the developer bearing member is closest to the image bearing member without making contact with the developer bearing member for regulating the amount of the developer borne on the developer bearing member in a state that the developing device is placed in a position for developing an electrostatic latent image formed on the image bearing member;
• a development frame made of resin and configured separately from the regulation blade to accommodate the developer, the development frame having a mount portion for mounting the regulation blade;
• and
• a seal member,
• wherein the regulation blade has a mount portion for mounting the seal member, and
• in a state that the developing device is placed in the position for developing an electrostatic latent image formed on the image bearing member when the regulation blade is fixed to the mount portion of the development frame for mounting the regulation blade, and the seal member is fixed to the mount portion of the regulation blade for mounting the seal member, the seal member is arranged to make contact with the developer bearing member in a downstream side of the rotational direction from a position where the developer bearing member is closest to the regulation blade and in an upstream side of the rotational direction from the position where the developer bearing member is closest to the image bearing member in a rotational direction of the developer bearing member to seal at least a part of a space formed between the developing device and the image bearing member.

A developing device comprising:

• a developer bearing member rotatably provided to bear a developer including a toner and a carrier for developing an electrostatic latent image formed on a rotatable image bearing member;
• a regulation blade made of resin and arranged to face the developer bearing member vertically under a position where the developer bearing member is closest to the image bearing member without making contact with the developer bearing member for regulating the amount of the developer borne on the developer bearing member in a state that the developing device is placed in a position for developing an electrostatic latent image formed on the image bearing member;
• a development frame made of resin and configured separately from the regulation blade to accommodate the developer, the development frame having a mount portion for mounting the regulation blade;
• and
• a seal member,
• wherein the regulation blade has a mount portion for mounting the seal member, and
• in a state that the developing device is placed in the position for developing an electrostatic latent image formed on the image bearing member when the regulation blade is fixed to the mount portion of the development frame for mounting the regulation blade, and the seal member is fixed to the mount portion of the regulation blade for mounting the seal member, the seal member is arranged to face the developer bearing member without making contact with the developer bearing member in a downstream side of the rotational direction from a position where the developer bearing member is closest to the regulation blade and in an upstream side of the rotational direction from the position where the developer bearing member is closest to the image bearing member in a rotational direction of the developer bearing member to seal at least a part of a space formed between the developing device and the image bearing member.