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Printhead Pivot With Skew Adjustmust

IP.com Disclosure Number: IPCOM000037611D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Hughes, FM: AUTHOR [+3]

Abstract

In the manufacture and assembly of printing heads, sometimes a skew condition may prevail, normally as a result of cumulative tolerances. This skew condition is characterized by the printed characters being skewed or slanted (either to the left or right) from vertical. While this condition may not be noticeable with a small amount of skew, such as 2o-2.5o in normal printing, nevertheless it becomes noticeable even with this small amount skew when printing characters in the graphics mode such as forming interconnecting vertical lines, and the lines formed appear to have what is known as a venetian blind effect.

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Printhead Pivot With Skew Adjustmust

In the manufacture and assembly of printing heads, sometimes a skew condition may prevail, normally as a result of cumulative tolerances. This skew condition is characterized by the printed characters being skewed or slanted (either to the left or right) from vertical. While this condition may not be noticeable with a small amount of skew, such as 2o-2.5o in normal printing, nevertheless it becomes noticeable even with this small amount skew when printing characters in the graphics mode such as forming interconnecting vertical lines, and the lines formed appear to have what is known as a venetian blind effect.

The present print head mounting mechanism allows for adjustment of the print head in final assembled form to assure precise vertical alignment.

The device includes a print head mounting member 10 having a head pivoting section 12, which is connected to the mounting member 10 by notched web member 14 which web member acts as a hinge to allow pivotal movement of the pivoting head section 12 as shown by the arrow.

A thumb wheel 16 is disposed between the head section 12 and mounting member 10, and has a screw 18 that threadably engages the head section 12 at one end and the mounting member 10 at its other end. The opposite ends of the screw 18 are oppositely threaded, i.e., one end is left-hand threaded and the other right-hand threaded such that it acts like a turnbuckle which will pull the members 10 and 12 together upon...