Maintenance System and Sequence for Impulse Ink Jet Printer
Original Publication Date: 1985-Nov-01
Included in the Prior Art Database: 2005-Feb-19
This article describes apparatus to minimize ink jet failures and to restore operation in some cases after a failure has occurred. One embodiment of the apparatus is illustrated in the figure. It supplies ink to the print head, provides pressurized purging, wiping, and washing of the nozzle face, and collects spent fluids. The ink supply includes a pressurized ink reservoir, an on- carriage reservoir, a solenoid fill valve, and circuits for level detection and filling. The ink level in the on-carriage reservoir must be maintained at a specified distance below the print head and at atmospheric pressure. A thermistor is used to sense the ink level. If the ink level drops below the thermistor, the fill valve is opened until the ink level reaches the thermistor.