A mismatch detection system comprising a book block assembly line, a plurality of book block sensors, a case cover assembly line, and an infeed sorter. The book block assembly line may be operable to output conforming book blocks and divert nonconforming book blocks. The plurality of book block sensors may be operable to detect a unique identifier (UID) of the nonconforming book blocks diverted by the book block assembly line. The case cover assembly line may be operable to output case covers. The infeed sorter may be operable to receive the conforming book blocks and the case covers, group one book block and once case cover into a pair, detect whether the conforming book block and case cover of the pair match, divert any of the case covers that do not match, and output a matching pair to a book binding device.

The purpose of the present invention is to provide a sheet bundle conveying apparatus capable of discharging a sheet bundle from a processing tray where a binding process is performed toward the downstream side in right posture to a right position. The present invention comprises a sheet bundle conveying apparatus which conveys sheets stacked at a stack portion to a storing portion at the downstream side including a first conveying member which conveys sheets at the stack portion by a predetermined distance, a second conveying member which performs relay conveyance of the sheets conveyed by the first conveying member by the predetermined distance as being set to have a higher moving speed than that of the first conveying member, and a driving portion which drives the first conveying member and the second conveying member.