Browse Prior Art Database

Flushing System for Impulse Ink Jet

IP.com Disclosure Number: IPCOM000045773D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 80K

Publishing Venue

IBM

Related People

Drago, GA: AUTHOR [+3]

Abstract

High quality ink jet printing requires the use of very small ink jet nozzles, generally less than .002 inch in diameter. Such nozzles are subject to clogging, especially during initial flushing and purging of a system. This is due to the difficulty of producing ink jet printhead parts which are free of debris and assemblying such parts without generating additional debris.

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Flushing System for Impulse Ink Jet

High quality ink jet printing requires the use of very small ink jet nozzles, generally less than .002 inch in diameter. Such nozzles are subject to clogging, especially during initial flushing and purging of a system. This is due to the difficulty of producing ink jet printhead parts which are free of debris and assemblying such parts without generating additional debris.

Disclosed herein is a structure and method for purging and cleansing the impulse ink jet printhead, both upon initial system start-up and upon any subsequent nozzle clogging. The structure provides a low impedance flush port or channel disposed in close proximity to the ink jet nozzles.

Fig. 1 shows a single nozzle embodiment of the flush system. Ink is introduced under pressure into the ink supply cavity through a filtering system (not shown). Ink then flows through the impulse drive cavity and interconnecting cavity 10 to the nozzle. Drive crystal 12 is in communication with the impulse drive cavity. When the drive crystal is pulsed by an electrical circuit, droplets of ink are expelled from the nozzle. A flush port 16 vents the interconnecting cavity 10 to the atmosphere. The impedance of the flush port is low compared to that of the nozzle. Total flow through the head is then very much larger than it would be if all flow passed through the nozzle. This large flow tends to entrain air bubbles and debris and carry them from the head through the flush port, thereby cleaning the ink jet head. Nozzles may be cleared of debris b...