Keystroke aligning system and margin indicator for typewriters a

Details Keystroke aligning system and margin indicator for typewriters a Keystroke aligning system and margin indicator for typewriters a

1986-11-17

1989-09-19

Burr, Edgar S.

Typewriting machines

Means auxiliary to typewriting function

Indicator means

400711, B41J 2942

Patent

active

048675920

ABSTRACT:
An optical method for alignment of paper when making corrections and additions to previously typed or printed sheets is described. A light spot is projected which indicates the exact point of type impact on the sheet. The paper can then be moved until the spot falls onto the desired area. The system can also be used for margin and end-of-page signalling.

REFERENCES:
patent: 2558147 (1951-06-01), Nicely
patent: 2873013 (1959-02-01), Thiene et al.
patent: 4339208 (1982-07-01), Biedermann
"Fibre-Optic Object Sensor" by Bealle, IBM Technical Disclosure Bulletin, vol. 23, No. 5, Sep. 1980.

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