Electrophotography – Diagnostics – Document handling
Reexamination Certificate
2003-05-29
2004-10-12
Hirshfeld, Andrew H. (Department: 2854)
Electrophotography
Diagnostics
Document handling
C399S018000, C399S361000, C399S372000, C399S394000, C399S395000, C399S405000, C399S406000, C271S265020, C271S265010, C271S301000, C271S303000, C271S296000
Reexamination Certificate
active
06804473
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an image forming apparatus, and particularly to an image forming apparatus provided with an inspecting apparatus for inspecting sheets.
2. Description of Related Art
Among image forming apparatuses such as copying machines, there is one provided with a sheet treating apparatus such as a finisher for treating a sheet having an image formed thereon, and adapted to effect working as a bundle, i.e., such treatments as a bundle delivery treatment, a stapling treatment, a bending treatment, a binding treatment and a sorting treatment by the sheet treating apparatus.
Also, an image forming apparatus provided with such a sheet treating apparatus is provided with such modes as a top cover mode and a slip sheet mode, and is controlled so that is may be possible to insert as the top page, the final page or an intermediate page a sheet contained in a cassette provided in an image forming apparatus main body, or a sheet feeding tray. The treatment of this inserted sheet is a mere sheet transporting operation and therefore, both of the order number of insertion (location) and the number of inserted sheets of sheets inserted into each bundle can be set arbitrarily.
Now, in the image forming apparatus provided with such a conventional sheet treating apparatus, there is the possibility of occurrence of various abnormal sheets such as image abnormality by density abnormality, color misregister or skew-feed of a sheet, the inconvenience of a sheet itself such as wrinkles or curled selvage, and the wrong colors of a sheet by erroneous setting of the sheet.
However, when such an abnormal sheet occurs, judgment as to whether the sheet is normal or a normal image is formed on the sheet is not done and therefore, for example, even when an image transferred to the sheet contacts with a structure on a movement path and is disturbed thereby before it is completely fixed, the sheet is intactly delivered to the sheet treating apparatus such as a finisher.
When a binding treatment or the like is effected on a sheet bundle including the sheet thus delivered to the sheet treating apparatus, a book is abnormally handled due to the presence of an abnormal sheet. In this case, not only the abnormal sheet but also the other normal sheets came to nothing.
SUMMARY OF THE INVENTION
So, the present invention has been made in view of such existing circumstances, and has as its object to provide an image forming apparatus which, when an abnormal sheet occurs, can eliminate the abnormal sheet, and can automatically effect the recovery of the eliminated abnormal sheet.
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patent: 6256473 (2001-07-01), Kamanuma et al.
patent: 6661982 (2003-12-01), Koike
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patent: 2003/0038418 (2003-02-01), Isemura et al.
patent: 2003/0044186 (2003-03-01), Kato et al.
patent: 2003/0190169 (2003-10-01), Shibaki
Inoo Masaaki
Kato Hitoshi
Nakajima Yoshiyuki
Nakamura Tomokazu
Obuchi Yusuke
Canon Kabushiki Kaisha
Crenshaw Marvin P
Fitzpatrick ,Cella, Harper & Scinto
Hirshfeld Andrew H.
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