Sideshift erase apparatus and method for impact printers

Details Sideshift erase apparatus and method for impact printers Sideshift erase apparatus and method for impact printers

1979-11-21

1981-12-29

Coughenour, Clyde I.

Typewriting machines

Means auxiliary to typewriting function

Means for correcting typing errors

400304, B41J 2926, B41J 1958

Patent

active

043079717

ABSTRACT:
Erase apparatus for a typewriter utilizes a special double strike technique to permit quality erasures at normal character overstrike accuracies. The unwanted character is overstruck first slightly to one side and then slightly to the other side in the escapement direction. A preferred range to achieve apparently complete erasures occurs at sideshift distances between two and twenty percent of an average character escapement. In a presently preferred implementation, position codes are produced which cause the normal typewriter escapement apparatus to move the type carrier to the special striking positions for erasing.

REFERENCES:
patent: 1905118 (1933-04-01), Nadell
patent: 2544998 (1951-03-01), Kissell
patent: 3780846 (1973-12-01), Kopek
patent: 3942621 (1976-03-01), Karlan
IBM Technical Disclosure Bulletin, vol. 13, No. 11, Apr. 1971, Single Character Storage, Okcuoglu, 3500.
IBM Technical Disclosure Bulletin, vol. 20, No. 9, Feb. 1978, Bold Image Typing, Brown, 3555.

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