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Apparatus for providing ink to an ink-jet print head and for compensating for entrapped air

  • US 5,872,584 A
  • Filed: 10/31/1995
  • Issued: 02/16/1999
  • Est. Priority Date: 10/31/1994
  • Status: Expired due to Term
First Claim
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1. A back pressure regulator device for a ink-jet printing apparatus having an ink-jet print head within a print cartridge, and an ink plenum within the print cartridge in fluid communication with the print head, the device comprising:

  • means for providing ink to the print head at substantially constant back pressure and for compensating for air within the print cartridge, includinga pressure regulator means in fluid communication with the ink plenum for supplying ink to the print head at substantially constant pressure;

    a flexible bag within the ink plenum maintained at an internal reference pressure, said bag compensates for air within the print cartridge; and

    an actuator means for the back pressure regulator device and connected to said pressure regulator means, said bag directly bears against said actuator means and thereby actuates said pressure regulator device.

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