Unit print head assembly for an ink-jet printer

Details Unit print head assembly for an ink-jet printer Unit print head assembly for an ink-jet printer

1994-02-23

2001-10-23

Barlow, John (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

Reexamination Certificate

active

06305786

ABSTRACT:

TECHNICAL FIELD
This invention pertains to ink-jet printing, and in particular to modular construction of ink-jet printing pens whereby a print head assembly is manufactured as a unit and thereafter removably mounted to the pen body.
BACKGROUND AND SUMMARY OF THE INVENTION
Some ink-jet printers, such as manufactured by Hewlett-Packard Company under the designation DeskJet, include a cartridge or “pen” that is mounted to the printer. The pen includes a body that defines a reservoir of ink, and a print head that is operated for ejecting minute ink drops onto paper that is advanced through the printer.
Prior ink-jet pens have been constructed so that the print head is irremovably attached to the pen body, thereby preventing replacement of a print head without damage to the pen.
The present invention is directed to a construction whereby ink-jet printer pens have modular or unit print head assemblies that can be readily mounted to and removed from a pen body or carriage in the event that the assembly needs repair or replacement. Moreover, the print heads of an individual unit print head assembly may be fully tested before that assembly is joined with several other parts in constructing a pen.
Also provided is a mechanism for ensuring that the electrical connection between the assembly and carriage is sealed from exposure to liquids such as ink.


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