Two material frame having dissimilar properties for thermal ink-

Details Two material frame having dissimilar properties for thermal ink- Two material frame having dissimilar properties for thermal ink-

1996-05-01

1998-04-07

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

B41J 2175

Patent

active

057370028

ABSTRACT:
A thermal ink-jet pen cartridge having a rigid external frame member fabricated of a rigid engineering plastic, and an interior frame structure attached thereto, formed of a softer, more ductile plastic material than an engineering plastic. An ink reservoir is defined by the interior structure and a pair of flexible bag membranes formed of a plastic material impervious to the ink and compatible with the interior member material, allowing the membranes to be joined to the interior member to form a leak-proof joint. The external structure has locking features formed into an interior surface. When the interior member is injection molded to the external member, the molten material flows into and around the locking features, securing the interior member to the external member and resisting the shrinkage forces as the molten material cools. The ink reservoir is filled through a fill port passageway extending through the external frame member and the inner member. The passageway is lined with the softer material of the inner member, and is sealed by an oversized ball press fit into the passageway after the ink filling process.

REFERENCES:
patent: 2609570 (1952-09-01), Danielson et al.
patent: 4119034 (1978-10-01), Wax
patent: 4385025 (1983-05-01), Salerno et al.
patent: 5047790 (1991-09-01), Cowger et al.
patent: 5280300 (1994-01-01), Fong et al.
patent: 5325119 (1994-06-01), Fong
patent: 5359353 (1994-10-01), Hunt et al.
Search Report Dated Apr. 29, 1994, For European Patent 93114954.6.

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