Flexible print ribbon shield

Details Flexible print ribbon shield Flexible print ribbon shield

1988-02-01

1990-02-27

Wiecking, David A.

Typewriting machines

Including interposed inking device for record-medium

Means auxiliary to ribbon mechanism

4006451, B41J 3504

Patent

active

049040987

ABSTRACT:
A print wheel impact printer in a document encoder comprises a flexible shield (38) made from laminar polyester sheet, the shield (38) having a shielding portion (40) at either end of which is provided a folded portion (44), each folded portion (44) being operative by virtue of non-90 degree fold lines and by virtue of the folds (50,52) forming at least three sides of a polyhedron to support the flexible shielding section distant from the print wheel (14). The shielding portion (44) is maintained tilted relative to the line between the hammer (26) and the print wheel (14) thereby to provide an opening (68) wherethrough the ink ribbon may be passed when an ink ribbon cassette (10) is changed. In operation the flexible shielding portion (40) is moved and carried by the paper (30), driven by the hammer (26), against the ink ribbon (12) and print wheel (14) with the paper (30) protruding through an aperture (42) in the shielding portion (40). Extraneous marking or blemishes created on the paper by contact with the ribbon (12) are thereby avoided.

REFERENCES:
patent: 3874285 (1975-04-01), Kodaira et al.
patent: 4437401 (1984-03-01), Heinrich et al.

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