Impact printhead

Details Impact printhead Impact printhead

2011-04-19

2011-04-19

Colilla, Daniel J (Department: 2854)

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

C400S124280

Reexamination Certificate

active

07927031

ABSTRACT:
An impact printhead includes impact wires loosely held in a guide and driven to print. The printhead includes individual holes through which corresponding wires extend, and elongated holes formed in the guide for guiding the wires. The elongated hole includes a concave wall and a convex wall opposing each other. The wires are slidable on the convex wall. When the wires are not driven to print, the wires are at rest in pressure contact with the convex wall. Grooves may be formed in place of the elongated holes, and have second walls. The second wall lies substantially in a curved plane in which a first wall lies to define the individual hole. The wire is guided by the hole and groove. When the wire is not driven to print, the wire is at rest in pressure contact with the first and second walls.

REFERENCES:
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patent: 5320441 (1994-06-01), Yamakawa
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patent: 06336037 (1994-12-01), None
European Search Report for European Application No. 07111022.5, dated Feb. 16, 2010 (6 pages).

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