Wet type developing apparatus and wet type developing method

摘要

A wet type developing apparatus is provided which allows printing in a quality that is stable at an increased printing speed and also with changes in physical property of a liquid developer. The wet type developing apparatus to this end includes a liquid developer feed pathway which comprises a developing roller 7 for feeding the liquid developer onto a photoconductor drum 3; an anilox roller 9 immersed in part in the liquid developer and driven to rotate in rotational contact with the developing roller; and a doctor blade 11 disposed in contact with a surface of the anilox roller for controlling the rate of drawing up of the liquid developer. The developing and anilox rollers have their peripheral surfaces moving in an identical direction and at an identical rate of movement in an area of their rotational contact. A toner charger 12 is disposed opposite to a surface of the anilox roller downstream of an area of contact of the doctor blade with the anilox roller and upstream of an area of rotational contact of the anilox roller with the developing roller in a rotation direction of the anilox roller.

主权项

1. A wet type developing apparatus in which an electrostatic image formed by light exposure on a surface of a photoconductor drum is developed into a toner image with a liquid developer coated on a surface of a developing roller that is driven to rotate in rotational contact with the photoconductor drum, characterized in that said wet type developing apparatus comprises:
a feed pathway of the liquid developer that is constituted with the developing roller driven to rotate for feeding the liquid developer onto the photoconductor drum, and an anilox roller having recessed cells on its surface, in part immersed in the liquid developer and driven to rotate in rotational contact with the developing roller wherein the developing and anilox rollers have their peripheral surfaces moving in an identical direction and at an identical rate of movement in an area of their rotational contact; a doctor blade disposed in contact with the surface of the anilox roller for controlling the rate of drawing up the liquid developer; and a toner charger opposite to the surface of the anilox roller downstream of an area of contact of the doctor blade with the anilox roller and upstream of an area of rotational contact of the anilox roller with the developing roller in a rotation direction of the anilox roller, wherein electric charges of toner particles on the anilox roller are enhanced by adjusting an output of the toner charger and controlling a bias voltage to the anilox roller.