Paper movement monitor

Details Paper movement monitor Paper movement monitor

1988-06-30

1990-01-09

Eickholt, Eugene H.

Typewriting machines

Means auxiliary to typewriting function

Indicator means

226 45, 226100, 226 23, 250548, 250560, 101226, 271227, 271259, 271261, B41J 1164

Patent

active

048924261

ABSTRACT:
A monitor (18,26,28) monitors movement of paper (12) through a printer (16). The paper movement sensors (18,26) comprise one central wheel (70) or a pair of spaced edge wheels (158) each operating an individual photo-optic wheel (164,76). By counting pulses from the photo-optic wheels (76,164) monitor logic (28) determines conditions of jam, over-feeding and skew within the printer (16) both on an instantaneous and on a short term cumulative basis. The system self-calibrates through an initializing routine and later, continuously during operation. Paper movement sensors (18,26) are provided in dust-protected housings which can be chained together to provide monitoring facilities at many points.

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patent: 4530613 (1985-07-01), Horman et al.
patent: 4545031 (1985-10-01), Kobayashi
UK Patent Application GB 2187318 A, Published 9/3/87.
"Sheet Aligner", IBM Tech. Disclosure Bulletin, vol. 18, No. 5, Oct./75, pp. 1.307-1.308.

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