Patent ID: 6513919
Filing Date: 2003-02-04
Classification: B41J

Abstract:
A pressure-compensation device, used to adjust internal backpressure of an ink bag containing ink for use in an ink-jet printer, comprising:a motion element, moving along an axial direction of said ink bag; and a resilient element, having a constant elastic coefficient, bridging said ink bag and said motion element and being capable of extending along said axial direction to provide resilience for keeping said ink bag at a tension state whereby, as a volume of said ink bag decreases, said resilient element moves said motion element so as to provide a respective elongation thereof for restraining contraction of said ink bag and thus maintains said internal backpressure of said ink bag, wherein said device and said bag are located inside a cartridge that includes an air duct for communicating an inside of the cartridge with the atmosphere.