Print head maintenance method and apparatus with retractable wip

Details Print head maintenance method and apparatus with retractable wip Print head maintenance method and apparatus with retractable wip

1995-01-06

1996-10-29

Barlow, Jr., John E.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 32, B41J 2165

Patent

active

055701175

ABSTRACT:
A method and an apparatus (10) for cleaning an ink jet print head (12) draws contaminates from orifices (20) in the print head onto an orifice plate (14) and then wipes the orifice plate. The maintenance apparatus includes a purge cap (24) that has a recessed region (40) with an open end (36). The top side margins (42) of the open end define a periphery (44) around which a seal (60) is positioned. A positioning system (30) urges the orifice plate against the seal. A heating system (128) and a vacuum system (74) cooperate to create a differential pressure across the orifices to draw contaminates carried by liquid ink out of them and onto the orifice plate. A resilient wiper assembly (26) including a spring-mounted wiper blade (78) is positioned in and nominally extends outwardly of the recessed region of the purge cap. The positioning system moves the purge cap downwardly against the orifice plate so that the wiper blade engages and wipes the contamination from the orifice plate.

REFERENCES:
patent: 4015272 (1977-03-01), Yamamori et al.
patent: 4543591 (1985-09-01), Terasawa
patent: 4600931 (1986-07-01), Terasawa
patent: 4800403 (1989-01-01), Accattino et al.
patent: 4951066 (1990-08-01), Terasawa et al.
patent: 4959673 (1990-09-01), Noda
patent: 4970535 (1990-11-01), Oswald et al.
patent: 5184147 (1993-02-01), MacLane et al.

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