Patent ID: 6692120
Filing Date: 2004-02-17
Classification: B41J

Abstract:
A pressure regulation apparatus for an ink reservoir, comprising:an elastic bag mounted in said ink reservoir for freely passing an ambient air of an ambient environment outside said ink reservoir in and out said elastic bag, wherein said ink reservoir has an interior for holding an ink; a porous filter mounted in said ink reservoir for entering said ambient air outside said ink reservoir into said interior of said ink reservoir therethrough, wherein said porous filter is made of a material having plural fibers aligned in an axial direction; and a flowing channel formed between said porous filter and said ambient air outside said ink reservoir for passing by and entering said ambient air outside said ink reservoir into said interior of said ink reservoir through said porous filter and holding said ink therein temporarily, thereby said elastic bag and said porous filter complementarily regulating a pressure difference between said interior of said ink reservoir and said ambient environment outside said ink reservoir.