Patent ID: 8132994

Claim:
A bookbinding system including a preprocessing device and a ring bookbinding device that receives a paper bundle delivered from the preprocessing device, punches a plurality of holes on a binding side of the paper bundle, and performs a ring binding by inserting a ring into each of the holes, wherein the ring binding device includes a punching processing unit to punch the holes in the paper bundle, a bookbinding unit, including a cartridge for stocking a plurality of rings, to perform a ring binding by binding the paper bundle with the rings, a detecting unit to detect an abnormality of a ring in the cartridge, and a control unit to exchange a signal from the detecting unit with a preprocessing control unit of the preprocessing device for comparison with a setting condition in the preprocessing control unit each time when detection information obtained by the detecting unit changes, and when any one of the rings is determined as abnormal based on a result of the comparison and an execution of ring binding is set, the control unit inhibits the ring binding.