Browse Prior Art Database

Proportional Letter Feed Pin Setting Mechanism

IP.com Disclosure Number: IPCOM000092279D
Original Publication Date: 1968-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Miles, GT: AUTHOR [+2]

Abstract

A typewriter proportional letter feed mechanism like that described in U. S. Patent 3,346,086, includes pins 12 which, when set, mark the position of the letter feed mechanism for control of later backspace operations. Following a print position movement of the typewriter, such as carrier return or tabulation which is not controlled by the letter feed mechanism, pawl 14 can come to rest on an unset pin 12. The pin setter 15 of the letter feed mechanism is provided with a home pin setting projection 10 on pin setting chopper 11. Thus, pin 12, against which holding pawl 13 and sensing pawl 14 rest, is set during the next letter feed cycle to assure an accurate reference for later backspace control.

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Proportional Letter Feed Pin Setting Mechanism

A typewriter proportional letter feed mechanism like that described in U. S. Patent 3,346,086, includes pins 12 which, when set, mark the position of the letter feed mechanism for control of later backspace operations. Following a print position movement of the typewriter, such as carrier return or tabulation which is not controlled by the letter feed mechanism, pawl 14 can come to rest on an unset pin 12. The pin setter 15 of the letter feed mechanism is provided with a home pin setting projection 10 on pin setting chopper 11. Thus, pin 12, against which holding pawl 13 and sensing pawl 14 rest, is set during the next letter feed cycle to assure an accurate reference for later backspace control.

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