Title:
PRESSURE CONTROLLER FOR INK PEN
Document Type and Number:
Japanese Patent JP3406027
Kind Code:
B2
Abstract:
PURPOSE: To sustain the back pressure suitably in the working range of a printhead suitably and to control the back pressure surely regardless of the orientation of a pen while keeping consistency.
CONSTITUTION: Back pressure of an ink pen is sustained by providing capillary members 22, 24 contiguously to a bubble generator 18. The capillary member holds some quantity of ink contiguously to an orifice defined by the bubble generator regardless of the orientation of the pen. The some quantity of ink serves to supply a liquid seal being formed in the orifice. When the back pressure in the ink pen increases to the maximum level, the liquid in the orifice is overcome and a bubble of the ambient atmosphere flows into a tank 12 to lower the back pressure. When the back pressure returns back to a desired point, ink captured by the capillary member enters into the orifice to seal the orifice again.
Inventors:
Mark A Baldwin
Ella M. Duic
Mark El McCarty
Lowell Be McDaniel
John M. Altendorf
Joseph Bee Elliott
Bruce Cowger
Ella M. Duic
Mark El McCarty
Lowell Be McDaniel
John M. Altendorf
Joseph Bee Elliott
Bruce Cowger
Application Number:
JP24957893A
Publication Date:
May 12, 2003
Filing Date:
October 05, 1993
Export Citation:
Assignee:
HEWLETT-PACKARD COMPANY
International Classes:
B41J2/175; (IPC1-7): B41J2/175
Attorney, Agent or Firm:
Kaoru Furuya (2 outside)
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