An agricultural square baler, having: a parallelepipedal baling chamber, in which a plunger is movably received along longitudinal axis of the baling chamber; a feed inlet, through which crop material can be conveyed into the baling chamber to be compressed there by the plunger into bales, a duct connected to the feed inlet for collecting crop material before it is batchwise stuffed into the baling chamber; and a stuffer for batchwise stuffing the collected crop material from the duct through the feed inlet into the baling chamber, the stuffer, operably associated with the duct, comprising a rotatable drive shaft, at least one crank arm fixed to the drive shaft and a fork assembly comprising tines and at least one fork lever (11, 34) supporting the tines and being rotatably coupled to the at least one crank arm (8, 33) on the one hand and pivotably supported by at least one fulcrum (12, 35) of the stuffer on the other hand, allowing relative movement of the tines along at least a packer trajectory and a stuffer trajectory, the tines in the packer trajectory packing crop material in the duct and in the stuffer trajectory batchwise stuffing the collected crop material from the duct through the feed inlet into the baling chamber, the fulcrum (12, 35) being fixed to at least one pivotable member (16, 36) of the stuffer pivotable around a pivot for displacing the fulcrum (12, 35) along a predetermined fulcrum path to selectively move the tines along the respective trajectories (14, 15), characterized in that the at least one pivotable member (16, 36) is mechanically linked to the drive shaft by linking means of the baler provided for mechanically pivoting the at least one pivotable member (16, 36) in relation to the rotation of the drive shaft and in that the linking means comprise at least a packer and a stuffer cam mounted to a cam shaft rotating together with the drive shaft, the cams (19, 20) comprising a predetermined respective circumferential surface surrounding the cam shaft, and a cam follower for following the circumferential surface of the cams (19, 20) for determining the distance of the circumferential surface of the respective cams (19, 20) with respect to the cam shaft and provided to mechanically transfer the determined distance of the circumferential surface of the cams (19, 20) with respect to the cam shaft in function of the rotation of the drive shaft to a position of the fulcrum (12, 35) along the fulcrum path such that the tines move along the packer and the stuffer trajectory (14, 15) respectively. a parallelepipedal baling chamber, in which a plunger is movably received along longitudinal axis of the baling chamber; a feed inlet, through which crop material can be conveyed into the baling chamber to be compressed there by the plunger into bales, a duct connected to the feed inlet for collecting crop material before it is batchwise stuffed into the baling chamber; and a stuffer for batchwise stuffing the collected crop material from the duct through the feed inlet into the baling chamber, the stuffer, operably associated with the duct, comprising a rotatable drive shaft, at least one crank arm fixed to the drive shaft and a fork assembly comprising tines and at least one fork lever (11, 34) supporting the tines and being rotatably coupled to the at least one crank arm (8, 33) on the one hand and pivotably supported by at least one fulcrum (12, 35) of the stuffer on the other hand, allowing relative movement of the tines along at least a packer trajectory and a stuffer trajectory, the tines in the packer trajectory packing crop material in the duct and in the stuffer trajectory batchwise stuffing the collected crop material from the duct through the feed inlet into the baling chamber, the fulcrum (12, 35) being fixed to at least one pivotable member (16, 36) of the stuffer pivotable around a pivot for displacing the fulcrum (12, 35) along a predetermined fulcrum path to selectively move the tines along the respective trajectories (14, 15), characterized in that the at least one pivotable member (16, 36) is mechanically linked to the drive shaft by linking means of the baler provided for mechanically pivoting the at least one pivotable member (16, 36) in relation to the rotation of the drive shaft and in that the linking means comprise at least a packer and a stuffer cam mounted to a cam shaft rotating together with the drive shaft, the cams (19, 20) comprising a predetermined respective circumferential surface surrounding the cam shaft, and a cam follower for following the circumferential surface of the cams (19, 20) for determining the distance of the circumferential surface of the respective cams (19, 20) with respect to the cam shaft and provided to mechanically transfer the determined distance of the circumferential surface of the cams (19, 20) with respect to the cam shaft in function of the rotation of the drive shaft to a position of the fulcrum (12, 35) along the fulcrum path such that the tines move along the packer and the stuffer trajectory (14, 15) respectively.