Patent ID: 6568801
Filing Date: 2003-05-27
Classification: B41J

Abstract:
A pressure-compensation device, for adjusting an internal pressure of a cartridge whose interior space contains ink therein for use of an ink-jet printer, comprising:an accumulator bag, installed inside said cartridge, communicating inside thereof with the atmosphere through an air duct; a resilient element, including thereof a first end and a second end, said first end engaging with said accumulator bag, said resilient element producing a deformation and thereby inducing a backpressure inside said cartridge for acting against an inflation of said accumulator bag; and a motion element, connected with said second end of said resilient element, for contributing to axial movement of said accumulator bag; wherein, along with gradual decreasing of said ink inside said cartridge, external air being drawn through said air duct inflates said accumulator bag for balancing said internal pressure of said cartridge, and said inflation moves said resilient element and said motion element to maintain stably said internal backpressure inside said cartridge.