Browse Prior Art Database

Selective Adjacent Character Space Control

IP.com Disclosure Number: IPCOM000090392D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Schaefer, JO: AUTHOR

Abstract

Spacing between complementary shaped characters such as A and W is automatically adjusted to improve work appearance by automatic operation of a small increment backspace interposed between printing characters. In a proportional spacing typewriter such as that in U. S. Patent 3,346,080, mechanism is provided for spacing characters varied multiples of a small spacing increment in accordance with the character width. Specific two-character sequences, such as AW have a more compact appearance if their preprogrammed spacing is reduced.

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 76% of the total text.

Page 1 of 2

Selective Adjacent Character Space Control

Spacing between complementary shaped characters such as A and W is automatically adjusted to improve work appearance by automatic operation of a small increment backspace interposed between printing characters. In a proportional spacing typewriter such as that in U. S. Patent 3,346,080, mechanism is provided for spacing characters varied multiples of a small spacing increment in accordance with the character width. Specific two-character sequences, such as AW have a more compact appearance if their preprogrammed spacing is reduced. Mechanical And 10 recognizes the occurrence of a specific sequence of characters selected by leftward motion of character interposers 11, A, and 12, W, to drive bellcrank 13 clockwise and pull shielded cable 14 so as to automatically select a single space unit backspace prior to printing the second character.

Activation of A interposer 11 pivots bail 15 leftwardly to displace latch 16 downwardly to position b, via cable 17, bellcrank 18, and bail 19. Rotation of cam 20 during the ensuing print cycle drives latch 16 leftwardly, position c, against the upper edge of floating lever 21. Bellcrank 13 remains undisturbed since floating lever 21 is free to pivot about its axis 22. Latch 16 restores through position d to position e where it is retained partially depressed by leaf spring 23.

Leftward movement of W interposer 12 raises latch 24, identical in operation to latch 16, which goes through a c...