Printing machine with automatic off-center crown roller ribbon-w

Details Printing machine with automatic off-center crown roller ribbon-w Printing machine with automatic off-center crown roller ribbon-w

1976-10-22

1978-09-19

Wright, Jr., Ernest T.

Typewriting machines

Including interposed inking device for record-medium

Means auxiliary to ribbon mechanism

7423001, 74240, 226196, 4002362, 400221, B41J 3504

Patent

active

041147510

ABSTRACT:
In order to avoid ribbon rollover in a high speed impact printer, a crown roller, having a crown offset from the roller's center, is used to guide the ribbon. The crown tends to center the ribbon about itself and the roller is dimensioned so that the distance from the crown to the end flange of the roller is sufficiently far that under all operating conditions the ribbon will remain separated from the flange and hence will avoid rollover. In particular the roller is positioned so that the print head will initially impact the advancing ribbon off center toward one edge of the ribbon. As printing continues, this repeated impacting will cause that edge of the ribbon to wear, the result being that the tension across the ribbon will decrease and the crown roller will constantly reposition the ribbon as if it were of an ever decreasing width. This constant repositioning (or precision) will present unworn sections of the ribbon to the print mechanism and will simultaneously advance the worn edge toward the flange which is located a distance far enough from the crown to prevent rollover.

REFERENCES:
patent: 1780630 (1930-11-01), Page
patent: 2338414 (1944-01-01), De Sart et al.
patent: 2734615 (1956-02-01), Van Wallendael
patent: 3143270 (1964-08-01), Cohen
patent: 3735940 (1973-05-01), Schwartz
patent: 3814231 (1974-06-01), Cappotto
patent: 3825103 (1974-07-01), Riley
patent: 3830351 (1974-08-01), Cappotto
patent: 3965765 (1976-06-01), Vaillette et al.

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