Method of automatically aligning sheet material and apparatus for performing the method

A method of automatically aligning sheet material, especially paper, and an apparatus for performing the method are disclosed. A preferred embodiment of the apparatus is used in a high accuracy pen plotter including an automatic sheet feeder for feeding individual sheets of paper (33) from a paper t...

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Bibliographische Detailangaben
Hauptverfasser:	HALLIDAY, WALLACE S, GROENKE, JEFFERY W
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACCESSORIES FOR WRITING OR DRAWING ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS ARTICLES FOR WRITING OR DRAWING UPON BUREAU ACCESSORIES CALCULATING COMPUTING CONVEYING CORRECTION OF TYPOGRAPHICAL ERRORS COUNTING ELECTRIC DIGITAL DATA PROCESSING HANDLING RECORD CARRIERS HANDLING THIN OR FILAMENTARY MATERIAL HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES MEASURING MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PACKING PERFORMING OPERATIONS PHYSICS PRESENTATION OF DATA PRINTING RECOGNITION OF DATA RECORD CARRIERS SELECTIVE PRINTING MECHANISMS STAMPS STORING TARIFF METERING APPARATUS TESTING TRANSPORTING TYPEWRITERS WRITING OR DRAWING IMPLEMENTS
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Beschreibung
Zusammenfassung:	A method of automatically aligning sheet material, especially paper, and an apparatus for performing the method are disclosed. A preferred embodiment of the apparatus is used in a high accuracy pen plotter including an automatic sheet feeder for feeding individual sheets of paper (33) from a paper tray (3) to a platen for plotting. The sheet of paper is automatically fed from the tray to the platen, is pulled entirely free from the tray, and is aligned against a reference edge by moving the paper back and forth a number of times. A microprocessor, various stepper motors and encoders allow for accurate and repeatable positioning and alignment of the sheet of paper to be plotted. After plotting is finished the sheet of paper may be forcefully ejected from the plotter.