Development device, and process cartridge and image forming apparatus using the device

A process cartridge removably mounted on a main body of an image forming apparatus, comprising:

• an image carrier;
• and
• a developing device including;
• a developing unit having a developer storage chamber for storing a developer composed of a toner and a carrier, in which a developer agitating carrying member and a developer holding member capable of holding and carrying the developer agitated and carried by the developer agitating carrying member are disposed in the developer storage chamber;
• and an auxiliary developing unit for supplementing development for the developing unit, the auxiliary developing unit connected in communication with the developing unit and having an auxiliary storage chamber for storing the developer containing at least one of the toner and the carrier, wherein:
• the developer storage chamber of the developing unit and the auxiliary storage chamber of the auxiliary developing unit are disposed adjacently via a bulkhead;
• a dispenser chamber that can supply or withdraw a fixed amount of developer is formed in communication with the developer storage chamber and the auxiliary storage chamber inside the bulkhead;
• a dispenser member for carrying a fixed amount of developer is disposed within the dispenser chamber;
• and
• the developing device is opposed to the image carrier.

An image forming apparatus comprising:

• a main body;
• and
• a process cartridge removably mounted on a main body of an image forming apparatus, including:
• an image carrier;
• and a developing device having:
• a developing unit having a developer storage chamber for storing a developer composed of a toner and a carrier, in which a developer agitating carrying member and a developer holding member capable of holding and carrying the developer agitated and carried by the developer agitating carrying member are disposed in the developer storage chamber;
• and an auxiliary developing unit for supplementing development for the developing unit, the auxiliary developing unit connected in communication with the developing unit and having an auxiliary storage chamber for storing the developer containing at least one of the toner and the carrier, wherein:
• the developer storage chamber of the developing unit and the auxiliary storage chamber of the auxiliary developing unit are disposed adjacently via a bulkhead;
• a dispenser chamber that can supply or withdraw a fixed amount of developer is formed in communication with the developer storage chamber and the auxiliary storage chamber inside the bulkhead;
• a dispenser member for carrying a fixed amount of developer is disposed within the dispenser chamber;
• and
• the developing device is opposed to the image carrier.

An image forming apparatus comprising:

• an image carrier;
• and
• a developing device including:
• a developing unit having a developer storage chamber for storing a developer composed of a toner and a carrier, in which a developer agitating carrying member and a developer holding member capable of holding and carrying the developer agitated and carried by the developer agitating carrying member are disposed in the developer storage chamber;
• and an auxiliary developing unit for supplementing development for the developing unit, the auxiliary developing unit connected in communication with the developing unit and having an auxiliary storage chamber for storing the developer containing at least one of the toner and the carrier, wherein:
• the developer storage chamber of the developing unit and the auxiliary storage chamber of the auxiliary developing unit are disposed adjacently via a bulkhead;
• a dispenser chamber that can supply or withdraw a fixed amount of developer is formed in communication with the developer storage chamber and the auxiliary storage chamber inside the bulkhead;
• a dispenser member for carrying a fixed amount of developer is disposed within the dispenser chamber;
• and
• the developing device is opposed to the image carrier.