Patent ID: 6761440
Filing Date: 2004-07-13
Classification: B41J

Abstract:
An ink cartridge, having a first ink chamber and a second ink chamber, said first ink chamber having an air vent to reach air outside, and said second ink chamber is inter-connected to said first ink chamber and formed with an air passage to reach air outside; with the working of an regulating mechanism in said air passage, the negative pressure in said second ink chamber of said ink cartridge can be regulated; said regulating mechanism comprising:a piston, installed in said air passage, used for opening or closing the interconnection between said first and second ink chambers; a damping device, installed in said air passage, used for providing a damping force to said piston; wherein, the pressure of said air outside, said damping force and said negative pressure co-act on said piston, causing said piston to displace in said air passage for the opening and closing of the interconnection between said two ink chambers, thus adjusting the negative pressure in said second ink chamber; said piston has an ink passage that enables ink in said first ink chamber to flow into said second ink chamber through said ink passage; said damping device comprises a spring; said spring comprises a tension spring, with the two ends thereof being respectively fixated on said piston and the inner wall of said ink cartridge; said damping force acting on said piston comprises a pulling force; and a stopping block is installed on the inner wall of said air passage, causing said piston to be stopped by said stopping block during displacement in said air passage, thus enabling ink in said first ink chamber to flow into said second ink chamber through said ink passage.