Engage/disengage apparatus and photosensitive medium cleaning device of liquid printer using the same

A photosensitive medium cleaning apparatus of a printer employing a wet method, comprising:

• a cleaning roller for eliminating filth on the surface of the photosensitive medium by rotating in contact with the photosensitive medium;
• a liquid toner supplying unit for supplying liquid toner to the cleaning roller;
• and
• an engage and disengage apparatus which rotatably supports the cleaning roller, and contacts the cleaning roller with the photosensitive medium and separates the cleaning roller from the photosensitive medium;
• wherein the engage and disengage apparatus comprises:
• a housing closely secured to the photosensitive medium;
• a driving motor disposed at the housing for rotating a cleaning roller contacted with the photosensitive medium;
• a rotating bracket rotatably disposed at the housing for rotatably supporting the cleaning roller and contacting the cleaning roller with the photosensitive medium and separating the cleaning roller from the photosensitive medium;
• and
• a cam unit, rotating and moving linearly by a rotating force of the driving motor, that moves the rotating bracket for the cleaning roller to be contacted with the photosensitive medium by being rotated after being moved to the rotating bracket, while the driving motor is rotating in one direction, and returns the rotating bracket to its initial position by being separated from the rotating bracket, while the rotating motor is rotating in the opposite direction.