Cleaning structure for a developing unit of liquid electrophotographic printer

A developing unit of a liquid electrophotographic printer, comprising:

• a developing roller which forms a development gap with a photoreceptor web where developer is filled and develops an electrostatic latent image formed on the photoreceptor web;
• a squeegee roller installed at the rear end of the developing roller and which closely presses the photoreceptor web to squeegee surplus developer;
• and
• a cleaning mechanism which removes toner particles of the developer adhering to a surface of the squeegee roller using an electrical force,
• wherein the cleaning mechanism comprises:
• a cleaning roller installed to maintain a predetermined gap with the squeegee roller;
• a first voltage applying portion which applies a voltage to the squeegee roller;
• and
• a second voltage applying portion which applies a voltage to the cleaning roller lower than that of the squeegee roller, wherein the toner particles adhering to the squeegee roller move to the cleaning roller via a developer film formed at the predetermined gap due to a difference in voltage.

A developing unit of a liquid electrophotographic printer, comprising:

• a developing roller which forms a development gap with a photoreceptor web where developer is filled and develops an electrostatic latent image formed on the photoreceptor web;
• a squeegee roller installed at the rear end of the developing roller and which closely presses the photoreceptor web to squeegee surplus developer;
• and
• a cleaning mechanism comprising a cleaning roller, wherein said cleaning mechanism removes toner particles of the developer adhering to a surface of the squeegee roller using an electrical force,
• wherein a voltage difference between the squeegee roller and the cleaning roller is 1 kV or more.

A developing unit of a liquid electrophotographic printer, comprising:

• a developing roller which forms a development gap with a photoreceptor web where developer is filled and develops an electrostatic latent image formed on the photoreceptor web;
• a squeegee roller installed at the rear end of the developing roller and which closely presses the photoreceptor web to squeegee surplus developer;
• and
• a cleaning mechanism comprising a cleaning roller, wherein said cleaning mechanism removes toner particles of the developer adhering to a surface of the squeegee roller using an electrical force,
• wherein the cleaning roller has a negative crown shape.