position but when the bowl is not full the switch 310 will be in a second position similarly second switch no 312 monitors the hinge plate 306 thus when the hinge plate 306 is tilted upward the second switch will over ride the first switches indication that the bowl is seemingly empty worm gear 314 rides upon worm drive 324 and is thus propelled along the drive by the direction of rotation of dump motor 316 programmable logic controller plc 318 may thus set dump motor 316 into operation at a given time causing the worm gear 314 to move toward the far distal end of the worm drive 324 which pushes arm 336 attached to hinge plate 316 and not to cover plate 308 arm 336 then lifts hinge plate 316 however when worm gear 314 activates polarity switch third switch 320 mounted upon stop 326 at which third switch 320 signals relay 323 to reverse the current flow to motor 316 causing the motor to reverse direction worm gear 314 to retreat back toward motor 316 and the hinge plate 316 to return to the horizontal position relay 323 has first and second states in the first normal state current flows so as to drive worm gear 314 toward stop 326 and dump the bowl 72 while in the second state current flows so as to drive worm gear 314 toward return stop 327 at the end of the travel of worm gear 314 it will close switch 321 signaling the end of the cycle the termination of current will deactivate relay 323 and thus at the beginning of the next cycle current will once again flow so as to dump out the bowl 72 spring loaded pins 322 urge the.