Patent ID: 8348189

Claim:
A device for shredding sheet material, comprising shredding means for shredding the sheet material and a feed conveyor system for feeding sheet material to be shredded to the shredding means from a feed location and discharging sheet material shredded by the shredding means to a collecting location downstream of the shredding means, said feed conveyor system comprising a suction duct having an inlet and an outlet, which extends between the feed location and the shredding means, suction means for sucking sheet material to be shredded from the feed location to the shredding means via the suction duct and for sucking sheet material shredded by the shredding means to the collecting location, said shredding means comprising at least one stationary shear blade and at least one rotary shear blade, which can rotate along said at least one stationary shear blade, as well as drive means for rotationally driving said at least one rotary shear blade, characterised in that the device further comprises detection means for detecting an increased risk of jamming of the shredding means during operation of the device, as well as blocking means which operate in dependence on the detections made by the detection means for partially blocking the suction duct in a blocking position or releasing the suction duct in a free position.