Browse Prior Art Database

Self-Compensating Printhead-To-Paper Gap

IP.com Disclosure Number: IPCOM000046753D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Smith, RL: AUTHOR

Abstract

Wire matrix printer speed is increased by spring loading the printhead to ride on or close to the paper during printing. Mechanical tolerance variables in the printhead-to-paper gap are eliminated since the printhead paper guides contact the paper during printhead traverse. In the figure, wire matrix printhead 1 is spring loaded by spring 5 in the direction indicated by arrow 2 toward a paper document or paper web. Head guide 3 traverses back and forth in the directions indicated by arrows 4 across the paper document or paper web during printing. Since one end of spring 5 is connected to head guide 3 and the other end of spring 5 is connected to head 1, head 1 is always biased toward the paper during printing and can be adjusted to actually contact the paper.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Self-Compensating Printhead-To-Paper Gap

Wire matrix printer speed is increased by spring loading the printhead to ride on or close to the paper during printing. Mechanical tolerance variables in the printhead-to-paper gap are eliminated since the printhead paper guides contact the paper during printhead traverse. In the figure, wire matrix printhead 1 is spring loaded by spring 5 in the direction indicated by arrow 2 toward a paper document or paper web. Head guide 3 traverses back and forth in the directions indicated by arrows 4 across the paper document or paper web during printing. Since one end of spring 5 is connected to head guide 3 and the other end of spring 5 is connected to head 1, head 1 is always biased toward the paper during printing and can be adjusted to actually contact the paper. Since the print wires have less distance to travel when no gap exists between the printhead and the paper, printer speed is allowed to increase. Roller 7 has its axle rigidly connected to printhead 1. As printhead 1 traverses to the edges of the paper document or paper web being printed, roller 7 contacts the high dwells at each end of cam rail
8. This cams printhead 1 out of contact with the document being printed while head 1 is outside the lateral limits of the document. This action prevents head 1 from catching or jamming the edges of the document as it traverses back and forth.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]