Rigid loop case structure for thermal ink-jet pen

Details Rigid loop case structure for thermal ink-jet pen Rigid loop case structure for thermal ink-jet pen

1992-12-22

1995-09-19

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

220611, B41J 2175

Patent

active

054519950

ABSTRACT:
A rigid external case structure for a thermal ink-jet pen cartridge, which includes an ink reservoir within the case. The case includes an external frame structure made of an engineering plastic, and defining an open loop, with opposed open areas defined on each opposed side of the loop. Two opposed thin metal side cover plates are attached to the frame structure to cover the open areas, and provide rigidity to the case structure. As a result, the frame structure is substantially non-compressible in response to forces applied against the side members or against the frame, protecting the ink reservoir and preventing ink drool from the pen printhead.

REFERENCES:
patent: 3913774 (1975-10-01), Vajtay
patent: 4571599 (1986-02-01), Rezanka
patent: 4931811 (1990-06-01), Cowger et al.

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