Paper check device for a printer

Details Paper check device for a printer Paper check device for a printer

1987-10-23

1988-10-18

Wright, Jr., Ernest T.

Typewriting machines

Means auxiliary to typewriting function

Indicator means

400568, 400569, 400711, 400712, 400902, B41J 2946

Patent

active

047782960

ABSTRACT:
A paper check device for a printer including paper feed means, a light emitter, a light receiver, reflectance determination means, and paper check means. The paper check means determines that a paper is not on the platen when the platen is detected to be moving and a determined reflectance is in a preset range for a time interval longer than another preset value. The paper check device correctly detects whether the paper is on the platen even if the paper with already printed patterns of low reflectance is employed.

REFERENCES:
patent: 4014427 (1977-03-01), Rines
patent: 4255064 (1981-03-01), Kelly
patent: 4277176 (1981-07-01), Grosvernier
patent: 4540299 (1985-09-01), Yamada
IBM Technical Disclosure Bulletin, "Method For Ignoring a Punched Hole in Original Document", KIDA, vol. 24, No. 1B, Jun. 1981, pp. 549-550.

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