Browse Prior Art Database

Automatic Selection of Key to Display Mode for Typewriter

IP.com Disclosure Number: IPCOM000044896D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Heard, RS: AUTHOR

Abstract

The drawing shows in illustrative form a word processing system in which keyed-in text is displayed only on the non-printing display, such as a cathode ray tube, when paper is not in the printer. The presence of paper in the printer is sensed, and a mode-select system enables the printer. This automatic selection inherently corresponds to the selection an operator would normally prefer.

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Automatic Selection of Key to Display Mode for Typewriter

The drawing shows in illustrative form a word processing system in which keyed-in text is displayed only on the non-printing display, such as a cathode ray tube, when paper is not in the printer. The presence of paper in the printer is sensed, and a mode-select system enables the printer. This automatic selection inherently corresponds to the selection an operator would normally prefer.

In a typewriter equipped with a display (such as a CRT or a 40-character liquid crystal display), it is desirable to be able to operate in either of two modes. The key to print (KTP) mode is useful for operations where it is important to align with paper boundaries, previous text, or other marks on the paper. Examples are: filling out preprinted forms, typing labels, alignment of columns, and lift-off corrections. The key to display (KTD) mode is useful where the keyed material does not represent complete and final text, where alignment to the paper is not critical, or where printing would slow machine operation or be too noisy. Examples are: original keying of straight text, revision of text in machine memory, and scanning memory to make hyphenation decisions. In KTD, memory is altered as a result of keyboarding, the results are shown on the display, but no printing takes place. KTP is similar to KTD except that the keyed material is also printed. (Variations, such as printing only after a complete line has been keyed, are considered here to be simply forms of KTP. Temporary KTD mode, as in centering, may still take place during KTP).

Selection between KTP and KTD is usually done by means of a key or lever. This has several disadvantages related to operator training and ease of use. For an operator used to ordinary electric typewriters, the distinction...