Patent ID: 6027205
Filing Date: 2000-02-22
Classification: B41J

Abstract:
An ink jet printing device including:a body element; said body element including a side wall defining a cylinder chamber within said body element; and an end wall closing an end of said cylinder chamber;a piston in sealing engagement with said side wall and including an end face opposed to said end wall of said body element; said piston being displaceable in said cylinder chamber between a rest position with said end face adjacent said end wall and an operated position with said end face remote from said end wall;means acting on said piston and operative to urge said piston toward said end wall into said rest position;an ink chamber bounded by said side wall and said end wall of said body element and by said end face of said piston;a bore extending in said body element through said end wall from said ink chamber and comprising a nozzle for ejection of droplets of ink from said ink chamber;a pin carried by said piston and extending from said end face of said piston; said pin extending into and closing said bore when said piston is in said rest position and said pin being in an operated position retracted from said bore when said piston is displaced to said operated position; and ink supply means connected to said ink chamber and selectively actuable to supply ink to said ink chamber at a determined pressure; said determined pressure of the ink in said ink chamber acting on said end face of said piston to displace said piston from said rest position toward said operated position to retract said pin from said bore and thereby to eject ink from said ink chamber through said bore.