Apparatus for controlling ink pressure

An apparatus (1) for controlling ink pressure in a printhead, the apparatus comprising:

• an integrally formed structure (5) having:
• at least one control reservoir (10, 10′) separated into first (14, 14′) and second (15, 15′) chambers by a weir (13, 13′);
• at least one inlet passageway (11, 11′), extending from the first chamber (14, 14′) to an inlet port (21, 21′) on an edge of the structure (5), for supplying ink from a remote source into the first chamber (14, 14′) of the reservoir (10, 10′);
• at least one fluid outlet passageway (20, 20′), extending from the second chamber (15, 15′) to an outlet port (23, 23′) on an edge of the structure (5), for recirculating fluid from the reservoir (10, 10′) to the remote source of ink;
• at least one ink supply port (22, 22′), in communication with the first chamber (14, 14′), for supplying ink to, or receiving ink from, a printhead;
• and
• a pressure control system having a pressure sensing passageway, extending from the reservoir (10, 10′) to a pressure port (26, 26′) on the edge of the structure (5), for sensing the air pressure within the reservoir (10, 10′),
• wherein the pressure sensing passageway includes an air chamber (24, 24′),
• wherein the air chamber (24, 24′) includes one or more baffles (25, 25′).