Browse Prior Art Database

Automatic Underscore for Typewriters

IP.com Disclosure Number: IPCOM000089539D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Abell, WA: AUTHOR

Abstract

The normal underscore mode for typewriters requires a shift to the upper case, and is conventionally accomplished after the line or lines have been typed. Thus the typewriter operator types the lines and then must move the typewriter carriage/carrier back to the previously typed lines, shift the typewriter into the upper case mode, and underscore. The device illustrated in the drawing allows for automatic underscoring in both the upper and lower case modes such that, the underscore of the letter or number typed will occur before escapement of the carrier/carriage, and as long as the automatic underscore function mode is in operation, the repetitive cycle will continue.

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 53% of the total text.

Page 1 of 2

Automatic Underscore for Typewriters

The normal underscore mode for typewriters requires a shift to the upper case, and is conventionally accomplished after the line or lines have been typed. Thus the typewriter operator types the lines and then must move the typewriter carriage/carrier back to the previously typed lines, shift the typewriter into the upper case mode, and underscore. The device illustrated in the drawing allows for automatic underscoring in both the upper and lower case modes such that, the underscore of the letter or number typed will occur before escapement of the carrier/carriage, and as long as the automatic underscore function mode is in operation, the repetitive cycle will continue.

Turning now to the figure, a pulse-type, cyclically operable pump 13 provides a pulse of air through multiple outlets, two of which are illustrated, one going to the automatic underscore valve (keybutton) 14, which is normally closed until opened by the operator, and another to a normally closed valve 10. Upon opening the valve 14, a pulse of air is applied to a pneumatic diaphragm valve 15, which is normally opened, and therefore applied through a normally opened diaphragm valve 16. It is assumed that the keyboard coding is such that when the automatic underscore operation occurs, one or both of the diaphragm valves 17 and 18 are closed so that diaphragm valve 16 remains open.

The pulse of air passing through valve 16 is applied to the diaphragm of a diaphragm valve 19,...