all the way with the low actuating force level they are reopened to release the trapped material or object they are then reclosed with the low actuating force once the sensor signals that the doors have closed all the way then a high level of operating force is applied to hold them shut so that material deposited upon them does not force them open to provide this dual force level of operation there may be provided a powering of the shutters or doors with an electric motor that is operated at reduced voltage for closing and full voltage for locking alternatively there could be provided a mechanism having a low mechanical advantage that shifts to higher mechanical advantage when it has passed a certain point in fig3 there is illustrated the other alternate embodiment wherein there is provided as the delayed transport a conveyor mechanism 30 having associated therewith a control drive 32 schematically depicted in fig3 in the delayed transport technique of the invention as illustrated in fig3 a conveyor is used such as the conveyor 30 to carry the material towards the discharge opening or hopper 18 illustrated in fig3 when the conveyor is operated it discharges the material that is on it into the waste bin below when it is stopped under control of the drive 32 the conveyor functions as a means for storing material for the next discharge cycle if the stopping of the conveyor is followed by a brief period of reverse motion as preferred then any material near the drop off point that might otherwise fall into the.