An agricultural baler has a pickup elements, a conveyor transporting a harvested product stream picked up from a field by the pickup element, a baling chamber for baling the harvested product, a transferring element for transporting the harvested product from the conveyor to the baling chamber, the transferring element including a cylinder and a plurality of disks arranged on the cylinder, and a plurality of strippers extending into spaces between the disks for preventing winding of the harvested product on the disks, the strippers being formed as sensing brackets for sensing deviation of the strippers. Also a deviation of knife blades arranged in spaces between the neighboring disks and offset relative to the strippers can be evaluated as well.