Ink jet print head and printer

摘要

The head is formed by a container (2) comprising a rigid frame (14, 16) of tapered shape, bearing the nozzle (4) at one end thereof. Fitted into the frame is a tubular membrane (47) for containing the ink, which is sealed at the other end of the frame by a metal plate (51) connected to an electrode (6) in contact with the ink. The frame is provided with openings (58) to permit the membrane to keep the ink at atmospheric pressure. The electrode (6) is formed by a blade spring in contact with the metal plate (51) and is provided with a projection (42) disposed in a chamber (30) in the vicinity of the nozzle to maintain contact with the ink right up to exhaustion of the cartridge. The head is removably fixed in a seat on a carriage by means of lever which urges the head into its seat and also serves as electrical contact with the metal plate. A second contact is made to an electrode on the front of an alumina plate (3 ) in which the nozzle (4) is formed.