Tintenstrahlschreiber mit druckregulierter freier Tintenzuführung

The present invention relates to free-ink type ink-jet pens (FIG.1). A spring-loaded regulator mechanism is provided within the pen to allow ink from a pressurized ink reservoir to be fed to the pen while maintaining a predetermined set point back-pressure at the printhead (7) as needed for appropriate pen operation. A mechanism (e.g., 23, 223, 523, or 623) in communication with the ambient atmosphere is used in conjunction with a substantially constant force biasing mechanism (e.g. 29, 31, or 229, 231, or 529, 531, or 629, 631) to maintain the balance between the countervailing forces. Back-pressure is maintained substantially constant regardless of the ink flow rate from the ink reservoir into the pen.