Browse Prior Art Database

Proportional Spacing and Justification

IP.com Disclosure Number: IPCOM000095234D
Original Publication Date: 1965-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Hickerson, JE: AUTHOR

Abstract

The proportional movement system is for use with a printer or typewriter. Belt 1 moves until positioned by different selectable, stop pins 3A, 3B, and 3C to achieve different movements for different character widths. The ratio of all movements is adjusted by shifting pivot 25 to achieve justification of an entire line of print.

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Proportional Spacing and Justification

The proportional movement system is for use with a printer or typewriter. Belt 1 moves until positioned by different selectable, stop pins 3A, 3B, and 3C to achieve different movements for different character widths. The ratio of all movements is adjusted by shifting pivot 25 to achieve justification of an entire line of print.

The system can be used with the magnetic typewriter described in U.S. Patent 2, 985, 135 in which case belt 1 is composed of magnetic material. The system can be used with an ordinary typewriter in which case belt 1 carries sprocket holes through its entire length. The holes drive gears linked to the character feed mechanism of the typewriter.

In operation for proportional movement, a key depression automatically selects one pin 3A... 3C. Moveable gripper jaw 7 is moved upward by linkage 9 to tightly clamp belt 1 between fixed upper jaw 11 and moveable jaw 7. Linkage 9 simultaneously frees single revolution clutch 13. Clutch 13 allows one revolution of eccentric cam 15.

Springs 17 and 19 cause pulleys 21 and 23 to move rightwardly on pivots 25 and 29 until pulley arm 31 is stopped on selected pin 3A...3C. The bottom length of belt 1 freely follows pulleys 21 and 23. At approximately one half of the cycle of clutch 13, arm 33 pushes linkage 9 down. This frees belt 1 from upper jaw 11 and clamps belt 1 between jaw 7 and lower gripper jaw 35. Cam 13 completes the cycle by forcing arm 31 and consequently pulleys 21 and 23 back to the start position. The top length of belt 1 thus moves under the fo...