Compensation device for a printing head and printing unit comprising said compensation device

摘要

A compensation device configured to attenuate pressure variations in an ink printing head is provided. The device includes a first compensation chamber containing ink and having a bottom, an outlet orifice extending through the bottom, and an inlet orifice opposite the bottom; a second compensation chamber containing ink and having a bottom, an inlet orifice extending through the bottom, and an outlet orifice opposite the bottom; and a vent means allowing outflow of air contained in the compensation chambers. The vent means includes a first opening in the first compensation chamber; a second opening in the second compensation chamber operable to be in a lower position with respect to the first opening when the device is in an operating position in which the bottoms of the compensation chambers define lower walls of the corresponding compensation chambers; and an intermediate chamber communicating with the first opening and the second opening.

主权项

1. A compensation device, comprising:
a first compensation chamber configured to contain ink, said first compensation chamber comprising a bottom wall, an outlet orifice extending through said bottom wall, and an inlet orifice opposite said bottom wall; a second compensation chamber configured to contain ink, said second compensation chamber comprising a bottom wall, an inlet orifice extending through said bottom wall, and an outlet orifice opposite said bottom wall; a vent means configured to allow an outflow of air from said first compensation chamber and from said second compensation chamber; wherein said vent means comprises:
a first opening in said first compensation chamber, wherein the first opening is separate from the outlet orifice of the first compensation chamber and from the inlet orifice of the first compensation chamber;a second opening in said second compensation chamber, wherein the second opening is separate from the outlet orifice of the second compensation chamber and from the inlet orifice of the second compensation chamber,wherein said second opening is positioned lower than said first opening when said compensation device is in an operating position in which said bottom wall of said first compensation chamber and said bottom wall of said second compensation chamber respectively define a lowermost wall of said first compensation chamber and a lowermost wall of said second compensation chamber; andan intermediate chamber, wherein said first opening is in communication with said second opening via said intermediate chamber.