Patent ID: 7900918

Claim:
A sheet conveying system comprising: a first sheet conveying device including a first conveying roller pair adapted to nip and convey a sheet, a first releasing mechanism adapted to release nipping of the sheet by said first conveying roller pair, a third conveying roller pair disposed upstream from said first conveying roller pair, a second releasing mechanism adapted to release nipping of a sheet by said third conveying roller pair, and a first controller adapted to control said first conveying roller pair and said first releasing mechanism; a second sheet conveying device including a second conveying roller pair adapted to nip and convey the sheet conveyed by said first sheet conveying device, a second controller adapted to control said second conveying roller pair, and a detecting device adapted to detect position of a sheet; and a size detecting device adapted to detect a size of the sheet, wherein in response to the detection by said detecting device, said second controller is adapted to cause said first releasing mechanism to release the nipping of the sheet by said first conveying roller pair, said second controller is adapted to cause said second releasing mechanism to release nipping of a sheet by said third conveying roller pair when said first releasing mechanism releases the nipping of the sheet by said first conveying roller pair, and wherein when the size of the sheet detected by said size detecting device is shorter than a distance from said first conveying roller pair to said third conveying roller pair, said second controller is adapted to stop causing said second releasing mechanism to release the nipping of a sheet.