38 of the conveyor belt apparatus 24 moves panels 12 to its downstream end 30 the bottom belt flight 54 of the endless belt apparatus 52 engages the panels 12 and moves them from the conveyor apparatus top flight 38 the panels 12 are then captured between the brushwheel 50 and bottom belt flight 54 of the endless belt apparatus 52 which causes the brush wheel 50 to turn in timed relationship with the moving bottom belt flight 54 the bristles of the brush wheel 50 are resiliently crushed by the panels 12 so that the panels 12 are not bent as they move in an arc with the bottom belt flight 54 and brush wheel 50 the operation of the conveyor belt apparatus 24 and endless belt apparatus 52 of the panel forming device 28 are controlled by means of photoelectriccell devices located at the chute 34 and at the conveyor belt apparatus 24 as shown in fig1 a first photoelectric cell device 64 is located proximate the bottom or outlet end 36 of the chute 34 a second photoelectric cell device 66 is located a predetermined distance above thefirst photoelectric cell device 64 along the length of the chute 34 toward the inlet end 32 into the chute 34 and a third photoelectric cell device 68 located over the conveyor belt top flight 38 at the terminal.