Liquid developer supply system with pump for discharging fixed amounts of liquid developer

摘要

A pump-equipped liquid developer supply vessel is composed of a liquid developer supply vessel which holds a liquid developer therein; a cylinder with a bottom portion including a piston hole therein, a liquid developer suction hole with a liquid developer suction valve; a piston device which is slidably disposed within the cylinder, the piston device including a piston with a liquid developer inlet and a liquid developer inlet valve, a piston cover which is provided above the piston to form an inner space therebetween to hold the liquid developer therein, a piston shaft which, in a sealed state, passes through the piston hole formed in the bottom portion of the cylinder, and is integrally connected with the piston in such a manner as to slidably move the piston device along the inner side of the cylinder, when pressed upward or downward, the piston shaft including therein a developer discharge conduit which is connected to the inner space of the piston device and from which the liquid developer can be discharged for use.