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Browse Prior Art Database

Print Mechanism Motion Control for Improved Registration for Character Erase

IP.com Disclosure Number: IPCOM000047084D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Booth, JR: AUTHOR [+4]

Abstract

In daisy-wheel typewriters having a character erase function, because of the high registration requirements, it is necessary to erase a character with, as closely as possible, the same dynamic forces as were present when the character was printed. Disclosed is a method for accurately positioning the escapement system to insure reliable erase ribbon operation when performing erasures. (An erase ribbon may take the form of lift-off or cover up, and is sometimes referred to as "tape.") Typically, the movements that make up an erase operation are: 1. A movement of the space value in the direction opposite that of the print direction. At the same time, the ribbon is moved to the erase position and the target petal is selected. 2. A movement to the character with hammer fire but without ribbon or selection motion.

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This is the abbreviated version, containing approximately 52% of the total text.

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Print Mechanism Motion Control for Improved Registration for Character Erase

In daisy-wheel typewriters having a character erase function, because of the high registration requirements, it is necessary to erase a character with, as closely as possible, the same dynamic forces as were present when the character was printed. Disclosed is a method for accurately positioning the escapement system to insure reliable erase ribbon operation when performing erasures. (An erase ribbon may take the form of lift-off or cover up, and is sometimes referred to as "tape.") Typically, the movements that make up an erase operation are: 1. A movement of the space value in the direction opposite that of the print direction. At the same time, the ribbon is moved to the erase position and the target petal is selected. 2. A movement to the character with hammer fire but without ribbon or selection motion. This is followed by ribbon motion to drop the ribbon to the erase feed position with, once again, no escapement. This motion shears the erase tape off the paper. 3. Move the carrier to its approximate position just before the character was printed with no selection, ribbon or hammer motion. The improved method employs the "graphic" and "graphic adjust" operations defined in the preceding article, and will not be redefined herein. Reference is made to the preceding article to insure the reader's understanding of the method outlined hereinafter. Instituting the erase cycle accomplishes...