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Backspace for Typebar Typewriters

IP.com Disclosure Number: IPCOM000091688D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Machmer, JA: AUTHOR

Abstract

Typewriter carriage 10 is returned in the backspace direction in a continuous stroke under selective control of key 11 for making corrections, inserting underlines, etc. Normally, carriage return clutch 12 is selectively operable to pull cord 13 attached to carriage 10 through line feed control link 14 to cause, first, a line feed operation by rotation of pawl 15 and, second, return motion of carriage to the beginning of a new writing line. Depression of key 11, however, brings bellcrank 16 into contact with bracket 17 to move transfer link 18 rightwardly and rotate pusher shoe 19 against pivoted control bail 20 to insert stop projection 21 into window 22. Continued downward motion of key 11 rotates bellcrank 16 clockwise against clutch control arm 23 to engage clutch 12.

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Backspace for Typebar Typewriters

Typewriter carriage 10 is returned in the backspace direction in a continuous stroke under selective control of key 11 for making corrections, inserting underlines, etc. Normally, carriage return clutch 12 is selectively operable to pull cord 13 attached to carriage 10 through line feed control link 14 to cause, first, a line feed operation by rotation of pawl 15 and, second, return motion of carriage to the beginning of a new writing line. Depression of key 11, however, brings bellcrank 16 into contact with bracket 17 to move transfer link 18 rightwardly and rotate pusher shoe 19 against pivoted control bail 20 to insert stop projection 21 into window 22. Continued downward motion of key 11 rotates bellcrank 16 clockwise against clutch control arm 23 to engage clutch 12. Projection 21 prevents transmission of force from clutch 12 to index control 14 and no line feed operation is performed. Tape 13 is wound by clutch 12 so long as key 11 is depressed.

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