Registers – Calculators – Input-output calculator to indicator – printer – etc.
Patent
1974-07-22
1976-03-23
Cook, D. W.
Registers
Calculators
Input-output calculator to indicator, printer, etc.
235 6111R, 360 81, G06K 1326, G06K 710, G11B 586
Patent
active
039462056
ABSTRACT:
In a system for optically scanning and reading data printed in transversely extending lines longitudinally spaced apart on a document and comprising a scanning head including an electro-optical arrangement for scanning and reading the data, friction drive rollers for engaging and moving the document longitudinally past the scanning head, a motor drivingly connected to the rollers, and controls for the motor, the improvement in which the motor is a stepper motor having an output shaft which is advanced one step about its axis each time the motor is pulsed. The controls include a pulse generator, an optical system for detecting such lines of data on the document and stopping the longitudinal movement of the document, the optical system being operatively connected to the generator and effective to control the pulse output of the generator. The generator preferably provides pulses at a first predetermined frequency and pulses at a second and lower frequency. The controls include a speed selector circuit for selecting which of the first and second frequency pulses are to be fed to the motor. The optical system which finds the lines of data on the document controls the selector to switch the selector to the second and lower frequency pulses when the field of view of the optical system crosses the leading edges of the line of data to be read, thereby slowing the stepping speed of the motor. The controls also include circuitry responsive to the output of the line-find optical system to stop the pulsing of the motor and thereby to stop the longitudinal movement of the documents when the field of view crosses the trailing edge of a line of data. Other inputs are provided to the controls to control the speed selector.
REFERENCES:
patent: 3201512 (1965-08-01), Mason
patent: 3331947 (1967-07-01), Johnson
patent: 3501623 (1970-03-01), Robinson
patent: 3583709 (1971-06-01), Dollenmayer
patent: 3600557 (1971-08-01), Zappia
patent: 3639730 (1972-02-01), Higginbotham
patent: 3670099 (1972-06-01), Oliver
Melugin Leland A.
Parchesky Joseph
Cook D. W.
Datatype Corporation
Kilgore Robert M.
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