Patent ID: 7909324
Filing Date: 2011-03-22
Classification: B65H

Abstract:
1. A sheet conveying system comprising: an upstream sheet conveying apparatus that conveys a sheet; and a downstream sheet conveying apparatus capable of communicating with said upstream sheet conveying apparatus, and that receives the sheet from said upstream sheet conveying apparatus, wherein said downstream sheet conveying apparatus having a first sheet conveying unit that conveys the sheet, and said upstream sheet conveying apparatus having a second sheet conveying unit that conveys the sheet and passes the sheet to said downstream sheet conveying apparatus, wherein said upstream sheet conveying apparatus includes an abnormality detecting unit that detects occurrence of an abnormality in the conveyance of the sheet in said upstream sheet conveying apparatus, a passing completion-detecting unit that detects completion of passage of the sheet to said downstream sheet conveying apparatus, a notification unit that notifies said downstream sheet conveying apparatus of first information indicating a result of the detection by said abnormality detecting unit and second information indicating a result of the detection by said passing completion-detecting unit, and an upstream sheet suspension unit that suspends the conveyance of the sheet in said upstream sheet conveying apparatus when said abnormality detecting unit detects the occurrence of the abnormality, and wherein said downstream sheet conveying apparatus includes a receiving unit that receives the first and second information from said notification unit, a first determining unit that determines whether or not said abnormality detecting unit detects the abnormality based on the first information received by said receiving unit, a second determining unit that determines whether or not said passing completion-detecting unit detects the completion based on the second information received by said receiving unit, a downstream sheet suspension unit that suspends the conveyance of the sheet in said downstream sheet conveying apparatus, and a control unit that controls said downstream sheet suspension unit to suspend the conveyance in a case where said first determining unit determines that said abnormality detecting unit detects the abnormality and said second determining unit determines that said passing completion-detecting unit detects the completion, while controlling the first sheet conveying unit to keep conveying the sheet in all other cases.