INTERCHANGEABLE PRINTHEAD

摘要

An interchangeable head system for an ink jet printer of the asynchronous, volume displacement droplet ejection type in which the print head is mounted on the print head carriage in a manner such that it may be readily detached and replaced with another head; the print head mounting allowing for adjustment of the distance from the print head nozzle to the print receiving medium. The ink supply connection to both the print head and the ink supply container includes means for automatically closing off the ink supply line to prevent either the loss of ink of the introduction of air into the container, supply and print head when either the print head of the container is removed from the system. The print head includes an ink supply pressure sensor for sensing the changes in pressure in the system and a valve operated by the sensor to supply ink to the system upon reduction of the pressure below a predetermined level.