Clean air hood for fluid jet printing

Details Clean air hood for fluid jet printing Clean air hood for fluid jet printing

1987-05-27

1989-10-17

Goldberg, E. A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 75, 346140R, 239 3, 239298, G01D 1518, B05B 502

Patent

active

048750549

ABSTRACT:
Disclosed is a clean air hood for disposition above the print head of a fluid jet printing apparatus having an orifice plate on one side of the print head for forming a plurality of droplet streams. The droplet streams flow past charge and deflection electrode means as well as a fluid catcher whereby uncharged droplets are deposited on a substrate. The clean air hood includes an interior baffle for directing clean air through the hood for issuance through a pair of laterally spaced slots along opposite sides of the hood whereby the air curtains formed thereby straddle the print head. In operation, the air curtains flow along opposite sides of the print head and opposite sides of the droplet streams ot maintain a clean air region about the electrode means and dampen any tendency of particulate matter carried by the substrate from migrating into the region of the electrodes. The print bar is rotated 180.degree. to locate the orifice plate in opposition to the opening through the lower end of the hood whereby the orifice plate may be changed in a clean air region.

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patent: 4122457 (1978-10-01), Erikson et al.
patent: 4545525 (1985-10-01), Sachar et al.
patent: 4591869 (1986-05-01), Katerberg et al.
patent: 4591870 (1986-05-01), Braun et al.

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