Ink-jet pen with rectangular ink pipe

An ink-jet pen comprising:

• a printhead;
• an ink chamber coupled to said printhead and having a bottom wall and sidewalls extending upward from said bottom wall which define a center chamber and first and second oppositely arranged aide chambers, respectively;
• a body of resilient synthetic foam mounted in each of said center ink chamber and said first and second oppositely arranged side chambers;
• and
• a centrally located non-capillary ink conducting pipe having a first end coupled to said center chamber and a second end coupled to said printhead, said first end having a rectangular internal cross-section, said first end extending upwardly into compressive contact with said body of resilient synthetic foam in said center chamber and defining a transition region between a capillary fluid path in said body of resilient synthetic foam and a non-capillary fluid path in said non-capillary ink conducting pipe, said rectangular internal cross-section of said first end preventing air bubbles trapped in said non-capillary ink conducting pipe from occluding said non-capillary ink conducting pipe in said transition region;
• and
• wherein each of said first and second side chambers is connected to said printhead by a side ink pipe having a length which extends directly upwardly in a first direction of travel from said printhead and then outwardly in a generally perpendicular second direction of travel into its respective ink chamber into compressive contact with said body of resilient foam located therein.