Ink delivery system for liquid electrophotographic printer

An ink delivery system for a liquid electrophotographic printer for supplying developer of a predetermined concentration and comprising a mixture of ink and carrier to a development unit, said system comprising:

• a circulation tank containing developer supplied to said development unit;
• an ink tank and a carrier tank included in a main body of said printer, said ink tank storing ink and said carrier tank storing carrier, said ink and said carrier being supplied to said circulation tank;
• a refill cartridge for refilling one of said ink and said carrier through a respective supply path when one of said ink and said carrier in said ink tank and said carrier tank, respectively, is used up;
• and
• refill cartridge installation means to which said refill cartridge is detachably installed for supplying said one of said ink and said carrier from said installed refill cartridge to a respective one of said ink tank and said carrier tank;
• wherein said refill cartridge has a single entrance through which said one of said ink and said carrier contained in said refill cartridge is exhausted, and said refill cartridge installation means comprises:
• a movable plate having an injection hole for said respective sunplv path;
• and
• a driving source for moving said movable plate so as to register said single entrance with one of said injection holes.

An ink delivery system for a liquid electrophotographic printer for supplying developer to a development unit and for disposing of waste developer, said system comprising:

• a circulation tank containing developer supplied to said development unit;
• a waste tank connected to said circulation tank to collect waste developer from said circulation tank;
• and
• waste refill cartridge installation means provided in said main body of said printer and connected to said waste tank, said waste refill cartridge installation means being adapted to detachably receive a waste refill cartridge;
• wherein saidwaste refill cartridge installationmeans comprises awaste developer exhaustion path connected to said waste tank, and a waste developer exhaustion pump installed on said waste developer exhaustion path for exhausting the waste developer in said waste tank to said waste refill cartridge.

An ink delivery system for a liquid electrophotographic printer for supplying developer comprising a mixture of ink and carrier to a development unit, said system comprising:

• an ink tank and a carrier tank included in said printer, said ink tank storing ink and said carrier tank storing carrier,
• refill cartridge means for refilling at least one of said ink and said carrier through a respective supply path;
• and
• refill cartridge installation means to which said refill cartridge means is detachably installed for supplying said at least one of said ink and said carrier from said installed refill cartridge means to a respective one of said ink tank and said carrier tank;
• wherein said refill cartridge means has at least one entrance through which said at least one of said ink and said carrier contained in said refill cartridge means is exhausted, and said refill cartridge installation means comprises:
• a movable plate having at least one injection hole for said respective supply path;
• and
• a driving source for moving said movable plate so as to register said at least one entrance with said at least one injection hole.