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Browse Prior Art Database

Improved Writing Line Visibility

IP.com Disclosure Number: IPCOM000088570D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Mathews, RD: AUTHOR

Abstract

Visual observability of a writing line is improved by repositioning a daisy wheel print element spring biasing a selected pedal on the element, and increasing the print velocity of a print hammer.

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Improved Writing Line Visibility

Visual observability of a writing line is improved by repositioning a daisy wheel print element spring biasing a selected pedal on the element, and increasing the print velocity of a print hammer.

A line of sight 30 degrees or less above horizontal is required for total visibility of a writing line. A daisy wheel print element is normally positioned very close to a printer platen and the line of sight is far greater than 30 degrees. That is, the distance X (Fig. 1) is normally about 2 mm, and a distance of about 5 mm is needed for total visibility. In order to displace print element 1 further from platen 7, print plunger 8 and hammer 10 (Fig. 2) must be similarly displaced. This will reduce throughput due to increased rebound time from that shown by the solid line in Fig. 3.

Print element 1 is mounted on shaft 2 of motor 9 and has pedals carrying character slugs 3. A spring 4 is carried by carrier 6 which also carries motor 9. Located adjacent the upper end of spring 4 is damper 5 to prevent spring 4 from driving slug 3 back into contact with plunger 8 following printing.

For printing, hammer 10 is driven against plunger 8 to cause slug 3 to print a character against platen 7. The velocity with which slug 3 is moved toward platen 7 is shown in dotted lines in Fig. 3. During travel of slug 3 toward platen 7, spring 4 is contacted. Spring 4 decelerates slug 3 to the same impact velocity as with the above mentioned normal arrangement...