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专利名称：Apparatus and method for calibrating
printing at a specified distance from adocument edge
发明人：Ralf M. Brooks,Fredrik L. N. Kallin,Gary R.
Marshall,Bruce A. Reid
申请号：US07/470452申请日：19900126公开号：US04960336A公开日：19901002
摘要：A method for calibrating a printer to print data beginning at a specified distancefrom the reference edge of a document. Several test documents are moved through aprint station and a test symbol is printed on each of them with a preselected set ofheating elements from a dot matrix thermal printer. The test documents are thenprocessed through the same print station whereupon a sensor detects the referenceedge of the document and the test symbol. A master controller then determines a testsymbol distance between the reference edge and the midpoint of the test symbol foreach test document. A plurality of test documents is processed in this manner, and themaster controller determines an average test symbol distance for the plurality of testdocuments. Using an average test symbol distance, the master controller determines thedistance between the sensor and a given hewating element of the thermal printer. Themaster controller than calculates a calibration distance which is based on a comparison ofactual distance between the reference edge and the preselected heating elementsversus average test symbol distance. In order to calibrate the printer to account for the
calibration distance so that the printer prints data beginning at substantially the specifieddistance from the reference edge of the document, the master controller utilizes astepping motor to make coarse calibration adjustments by advancing the document infull and/or half steps. Fine calibration adjustments are made by selectively energizingheating elements of the thermal printer.
申请人：NCR CORPORATION
代理人：Wilbert Hawk, Jr.,Albert L. Sessler, Jr.,Elmer Wargo
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