8 39 the transmitter 5 is deactivated so that the danger zone i is no longer secured protected by the beam transmitting receiving apparatus 5 6 and thus in this zone the danger zone i a new fiber bale series 8 may be set up turning to fig2 there is illustrated therein a second type of bale opening system in which a bale series formed of fiber bales 3a is supported on the upper run of a transporting conveyor belt working belt 24 while a travelling bale opener 2 detaches fiber tuft from the upper surfaces of the fiber bales 3a the bale opener 2 which may be a bdt 020 model manufactured by trutzschler gmbh amp co kg momchengladbach germany shapes an inclined top bale surface 21a as it performs the fiber tuft detaching operation during its travel back and forth along the working belt 24 as it may be observed in fig2 the fiber bales 3a because of the inclined detaching surface 21 are being consumed gradually from the left therefore a continuous detaching operation may take place if as the leftmost fiber bale is about to be entirely consumed a new fiber bale standby bale 3b is added to the working belt 24 from a transport conveyor belt reserve belt 25 on which full height standby fiber bales 3b are lined up such a resupply from the reserve belt 25 onto the working belt 24 is effected by moving the upper run of the reserve belt 25 towards the left by means of a belt driving mechanism including for example a drive 28 transmitting a.