Recorders – Magnetographic
Patent
1975-11-03
1977-09-27
Lucas, Jay P.
Recorders
Magnetographic
156584, 427 47, G03G 1900
Patent
active
040514846
ABSTRACT:
A Universal Product Code (UPC) bar pattern printer comprises a loop of magnetizable recording tape moving at a constant speed past writing heads. The tape advances to a toner applicator incorporating a toner applicator drum having a surface incorporating a plurality of magnetic poles and a series of magnetizable wires parallel to the upper, longitudinal periphery of the drum. The wires and drum cause the toner material adhered to the drum to form rotating helical ridges of toner along the upper periphery of the wires. The magnetized recording tape makes physical contact with and is swept by these ridges to form a toner deposited image on the recording tape. This image is enhanced by cleaning with a sheet of air from an air knife and transferred to a label. The label is synchronously peeled from its backing and then fused by a heater. The label may then be replaced on a label backing strip for application to a package. The recording tape is readied for re-writing by de-magnetization and sapphire knife removal of all residual material. Timing sensors and circuitry ensure highly accurate bar width as well as registration and centering of the bar code pattern on the label. The module width of the bar pattern is chosen to be an integral multiple of the average magnetic agglomerate diameter of toner agglomerates formed by the magnetic toner applicator. The same integral number of flux reversals are laid down on the magnetic tape to print a module. A timing capstan driven by the magnetic tape controls the flux reversals to insure highly accurate printing.
REFERENCES:
patent: 3631838 (1972-01-01), Kushima
patent: 3678897 (1972-07-01), Hewitt
patent: 3708790 (1973-01-01), Nourigat
patent: 3899381 (1975-08-01), O'Brien
patent: 3918402 (1975-11-01), Ohta
patent: 3965478 (1976-06-01), Schloemann
patent: 3966534 (1976-06-01), Oddy
patent: 3974796 (1976-08-01), Murray, Jr.
patent: 3987491 (1976-10-01), Nelson
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