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Browse Prior Art Database

Ribbon Feed for Print Visibility

IP.com Disclosure Number: IPCOM000049745D
Original Publication Date: 1982-Jul-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Heard, RS: AUTHOR

Abstract

The ribbon vibrator is eliminated in an impact printer by feeding the ribbon from the bottom at an acute angle to a height at which the highest point of the ribbon seen is at the bottom of the previous line from a viewing angle of 30 degrees above the printer. The ribbon leading up and back obscures primarily only the right half of the one previous character printed.

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Ribbon Feed for Print Visibility

The ribbon vibrator is eliminated in an impact printer by feeding the ribbon from the bottom at an acute angle to a height at which the highest point of the ribbon seen is at the bottom of the previous line from a viewing angle of 30 degrees above the printer. The ribbon leading up and back obscures primarily only the right half of the one previous character printed.

Fig. 1 shows the path of ribbon R viewed from 30 degrees above

g the printing station. Ribbon R is fed from the bottom at an acute angle of 60 degrees. Vertical lines are shown separating the locations of printed characters. As shown, the topmost horizontal span seen appears between the previous writing line and the current writing line. The X designates the location at which the next character will be printed, and it is obscured. The ribbon part coming from below obscures the lower to upper diagonal of the immediately previous character. The upper left half is not obscured, and that normally contains most of the character information.

Fig. 2 shows the relevant elements from the side. Ribbon R is directed upward with its thin edge presented to the side as shown. The wide surface of ribbon R is parallel to a generally conventional platen 1. At point 3 near platen 1 ribbon R is bent so that it leads away from platen 1. Point 3 is low enough so that a view from station 5, at a 30 degrees angle up from the horizontal, shows printing on a paper mounted on platen 1 as shown and described with respect to Fig. 1. While ribbon R is shown extending back from platen 1 on a horizontal plane, a plane disposed upward to 30' may be employed without obstructing the view fro...