(19)
(11) EP 1 013 581 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.07.2000 Bulletin 2000/28

(43) Date of publication A2:
28.06.2000 Bulletin 2000/26

(21) Application number: 99125214.9

(22) Date of filing: 17.12.1999
(51) International Patent Classification (IPC)7: B65H 7/00, B65H 1/18
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 23.12.1998 US 220976

(71) Applicant: Xerox Corporation
Rochester, New York 14644 (US)

(72) Inventors:
  • Linder, Michael J.
    Walworth, New York 14568 (US)
  • Moore, Claude E.
    Ontario, New York 14519 (US)
  • Yow, D. Gregory
    Webster, New York 14580 (US)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)

   


(54) Process for statically and dynamically controlling tilting paper supply for high capacity feeder


(57) A method of statically and dynamically controlling the height and angle of a feed tray (210) in an electrophotographic printing machine. The paper supply starts with the tray (210) lead edge ramped up 1.4 degrees and paper is loaded. Required paper properties are inputted or sensed automatically (e.g., gsm, size, etc.). The elevator raises to lowest possible stack height (to maintain stack control using tray guides in preparation for air system turning on). The initial tray angle is removed based on paper gsm and the air system activates fluffer and air knife jets (360), but vacuum is valved to off position. The stack height arm (352) is raised & lead edge attitude sensor (340) is interrogated for top sheet position relative to feed head acquisition surface (sensor may be position sensitive device type or multiple sensors with different focal lengths, etc.). Based on positions sensed by stack height and lead edge attitude sensors, the tray angle and/or stack height is adjusted until the desired sensor states are achieved. Upon completion of adjustments to the tray angle, stack height is verified. Feeding commences and stack height and lead edge attitude positions are checked each feed with corrections made accordingly.






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