Electrophotography – Image formation – Charging
Reexamination Certificate
2000-09-19
2001-10-23
Grimley, Arthur T. (Department: 2852)
Electrophotography
Image formation
Charging
C250S325000, C250S494100
Reexamination Certificate
active
06308032
ABSTRACT:
FIELD OF THE INVENTION
This application relates to xerography including, but not limited to, rotatable charging apparatus.
BACKGROUND OF THE INVENTION
Current xerographic printing machines use charging devices in the charging, recharging, pre-transfer, transfer, de-tack and pre-clean stations. Charging devices comprise several types, including glass-coated alternating-current wire scorotrons, also known as discorotrons, and solid-state devices, also known as “microtrons”.
These two devices, discorotrons and solid-state chargers, each provide substantially different operating characteristics. For example, while the operating-life of a discorotron is substantial, the discorotron generates a substantial amount of undesirable gaseous emissions such as, for example, ozone. In contrast, while a solid-state charger has a relatively short life, the solid-state charger produces only a fraction of the ozone of the equivalent discorotron. For example, in a preliminary experiment, a solid-state charger emitted only about one-seventh ({fraction (1/7)}) of the ozone emitted by the equivalent discorotron.
What is needed, therefore, is an improved charging apparatus that generates acceptable amounts of undesirable ozone gas while still providing a satisfactory operating life.
SUMMARY OF THE INVENTION
In one aspect of the invention, a rotatable charging apparatus comprises an apparatus length extending between a first end and a second end and centered about an axis parallel to the apparatus length, with plural charging devices fixed to an apparatus periphery surrounding the axis, the rotatable charging apparatus rotatable about the axis to thereby selectively position any charging device to face a proximate photosensitive element.
In another aspect of the invention, a printing machine comprises rotatable charging apparatus, the rotatable charging apparatus comprising an apparatus length extending between a first end and a second end and centered about an axis parallel to the apparatus length, with plural charging devices fixed to an apparatus periphery surrounding the axis, the rotatable charging apparatus rotatable about the axis to thereby selectively position any charging device to face a proximate photosensitive element.
REFERENCES:
patent: 4056723 (1977-11-01), Springett et al.
patent: 4734722 (1988-03-01), Maczuszenko et al.
patent: 5530526 (1996-06-01), Kleckner et al.
patent: 5563688 (1996-10-01), Bergen et al.
patent: 6210848 (2001-04-01), Nagai et al.
Facci John S.
LaRussa Joseph D.
Pietrowski Kenneth W.
Rodriguez Alberto
Rommelmann Heiko
Egan Wayne J.
Grimley Arthur T.
Tran Hoan
Xerox Corporation
LandOfFree
Rotatable charging apparatus, and printing machine including... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotatable charging apparatus, and printing machine including..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotatable charging apparatus, and printing machine including... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2578154