Image forming apparatus and sheet detecting unit...

Details Image forming apparatus and sheet detecting unit... Image forming apparatus and sheet detecting unit...

2005-11-15

2005-11-15

Colilla, Daniel J. (Department: 2854)

Electrophotography

Diagnostics

Document handling

C399S124000, C399S397000

Reexamination Certificate

active

06965740

ABSTRACT:
An image forming apparatus includes a transfer unit transferring a toner image on a first face of a sheet, a fixing unit fixing the toner image onto the first face of the sheet, and a sheet detecting unit detecting the sheet in a sheet transporting path. The sheet detecting unit includes a rotator which rotates by a slide contact on a second face which is backside of the first face of the sheet, and a supporting member which supports the rotator rotatably. The rotator is comprised of a material which is charged by the slide contact on the sheet with a first polarity, the first polarity being opposed to a second polarity with which a toner of the toner image is charged. The supporting member is comprised of a material charged by the slide contact on the sheet with the second polarity.

REFERENCES:
patent: 5915691 (1999-06-01), Deguchi et al.
patent: 6151458 (2000-11-01), Sato et al.
patent: 2000-072282 (2000-03-01), None
patent: 2000-072284 (2000-03-01), None

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