Hot melt ink jet printing apparatus

Details Hot melt ink jet printing apparatus Hot melt ink jet printing apparatus

1991-03-04

1992-04-14

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

B41J 2045, B41J 219

Patent

active

051052091

ABSTRACT:
An ink jet printing apparatus in which the ink jet print head is constructed to eliminate problems caused by air bubbles that can be present in fluid hot-melt ink. The apparatus head includes a heater to melt solid ink or lower the viscosity of high viscosity semi-solid ink and a plurality of ink jet nozzles corresponding to a series of piezoelectic vibrating elements that are positioned so that piezoelectric oscillations propel ink through the nozzles. The vibrators and nozzles are spaced so that if air bubbles are present in the melted ink the bubbles will be induced to travel away from the nozzles by piezoelectrically induced agitation so that they do not interfere with ink jet printing. The printer can include a vent hole to provide an exit for the bubbles. The vent hole can be selectively opened and closed.

REFERENCES:
patent: 4015272 (1977-03-01), Yamamori
patent: 4072959 (1978-02-01), Elmqvist
patent: 4312009 (1982-01-01), Lange
patent: 4383264 (1983-05-01), Lewis
patent: 4566018 (1986-01-01), Nilsson
patent: 4571599 (1986-02-01), Rezanka
patent: 4589000 (1986-05-01), Koto
patent: 4779099 (1988-10-01), Lewis
patent: 4785315 (1988-11-01), McCormick
patent: 4788556 (1988-11-01), Hoisington

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