Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Spring Biased Print Element

IP.com Disclosure Number: IPCOM000077392D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Mathews, RD: AUTHOR

Abstract

A print element in a single element typewriter is spring biased in a selected rotate and tilt position for reducing noise and preventing character malselection, vertical misalignment, and smear.

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 70% of the total text.

Page 1 of 2

Spring Biased Print Element

A print element in a single element typewriter is spring biased in a selected rotate and tilt position for reducing noise and preventing character malselection, vertical misalignment, and smear.

A rotate detent arm link 8 pivots about post 10 and integral spring 3 is brought in and out of contact with print element 1, as rotate detent arm 6 is moved up and down by tilt detent lever 4. Rotate detent arm 6 carries post 11 which is connected to detent arm link 8. When the typewriter is not in operation, the rotate detent arm 6, which is spring biased in an upward direction, is moved down by a detent cam, not shown, and tilt detent lever 4. In this position, there is a positive 4 clearance between spring 3 and print element 1. Also, post 7 is abutting the upper portion of elongated guide slot 9.

When a print cycle is initiated, print element 1 is rotated and tilted to its correct character selection position before the rotate detent arm 6 is permitted to move in an upward direction. No malselection results during this time, since the spring 3 is not in contact with, and dragging against, print element 1. Wear on the skirt of print element 1 which normally results from drag against backup shoe 12 is also eliminated. As print element 1 approaches its selected rotate and tilt positions, tilt detent lever 4 is raised, allowing rotate detent arm 6 to move in an upward direction. This movement brings spring 3 into contact with the print element...