Registers – Coded record sensors – Particular sensor structure
Patent
1976-04-09
1980-10-21
Cook, Daryl W.
Registers
Coded record sensors
Particular sensor structure
235455, 235475, G06K 714, G06K 1300
Patent
active
042289521
ABSTRACT:
Marks on test answer sheets and the like are detected by scanning with fiber optic line-to-circle converter using a single photocell. Four to five rows of optical fibers each about 2 to about 3 mils thick make up the fiber optic line, and the fiber optic "circle" is an arc no greater than about 95% of a circle. Scanning can be compensated for flaws in the optics and for poor response when photocell begins scanning the arc. Sheets are fed in spaced sequence. Electrically operated clutch-brake with spring-carried clutch synchronizes feed with scanning, particularly when clutch is opened for not over 0.1 second and is closed by a current pulse at a voltage substantially greater than used for holding it closed. Electronic logic can disable the equipment if markings on sheets show that improper control sheets are used. Scoring can be checked by verifying count of control sheet markings each time a test sheet is scored. Scores can be printed on the test sheets after scanning is completed, and sheets kicked out for feed error or preset condition of marks, with printer printing on sheet reason for kick-out. Scores are accumulated in multi-bit buffer memory and can be sent to magnetic tape, later to display. Similar markings on factory inventory sheets or payroll sheets can be scanned to control production or payroll preparation or the like.
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