Fuser entry guide with variable vacuum for an electrophotographic machine

A method and apparatus for increasing the efficiency of a vacuum-assisted, fuser entrance guide (30) in an electrophotographic machine (10) by varying the vacuum on the guide as a sheet (S) of copy medium moves thereacross, wherein a low vacuum is applied on the guide while the sheet of copy medium...

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Bibliographische Detailangaben
Hauptverfasser:	SLEVE, JERRY FRANK, GIANNETTI, JOHN, CAIAZZA, GIOVANNI B
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CINEMATOGRAPHY CONVEYING ELECTROGRAPHY ELECTROPHOTOGRAPHY HANDLING THIN OR FILAMENTARY MATERIAL HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES HOLOGRAPHY MAGNETOGRAPHY PACKING PERFORMING OPERATIONS PHOTOGRAPHY PHYSICS STORING TRANSPORTING
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Beschreibung
Zusammenfassung:	A method and apparatus for increasing the efficiency of a vacuum-assisted, fuser entrance guide (30) in an electrophotographic machine (10) by varying the vacuum on the guide as a sheet (S) of copy medium moves thereacross, wherein a low vacuum is applied on the guide while the sheet of copy medium is being transported across the guide solely by the vacuum transport (25) and is then increased once the lead edge of the sheet enters the nip between the fuser rollers (22,23) and the sheet becomes driven by the more powerful force of the fuser rollers. The higher vacuum provides a greater attraction force on the sheet, which, in turn, prevents the trail edge of the sheet from sagging or drooping from the guide's surface (35).