Document hole mask circuitry

Details Document hole mask circuitry Document hole mask circuitry

1977-10-21

1979-03-06

Kilgore, Robert M.

Registers

Coded record sensors

Particular sensor structure

235476, 235379, G06K 714, G06F 1530

Patent

active

041426738

ABSTRACT:
In a high speed document printing system a hole mask circuit is provided to compensate for erroneous indications of the entry of additional documents into the system due to the sensing of a discontinuity or aperture within the body of a valid document. The hole mask circuit receives a document present signal from an associated sensor and employs a retriggerable timing means to inhibit the recognition of an additional document unless the sensor has previously signaled the continuous absence of a document for a preselected time interval. The circuit is capable of discriminating between a valid document having apertures of a preselected maximum size, documents having invalidly sized apertures and spacings between successive documents.

REFERENCES:
patent: 3609305 (1971-09-01), Davis
patent: 3743839 (1973-07-01), Leis
patent: 3745312 (1973-07-01), Ladine
patent: 3949363 (1976-04-01), Holm
patent: 4027142 (1977-05-01), Paup

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