Apparatus for dispensing predetermined weights of a plurality of different liquid orgranular materials

Claim 1

APPARATUS FOR DISPENSING PREDETERMINED WEIGHTS OF A PLURALITY OF DIFFERENT MATERIALS, COMPRISING IN COMBINATION A PLURALITY OF STORAGE CONTAINERS WITHIN WHICH THE DIFFERENT MATERIALS ARE STORED RESPECTIVELY, A MAIN CONTAINER TO WHICH MATERIAL FROM THE STORAGE CONTAINERS CAN BE FED, A PLURALITY OF DISCHARGE MEANS CONTROLLING FLOW FROM THE STORAGE CONTAINERS RESPECTIVELY TO THE MAIN CONTAINER, ELECTRICAL WEIGHING MEANS FOR PRODUCING A FIRST SIGNAL OF MAGNITUDE DEPENDENT ON THE WEIGHT OF MATERIAL IN THE MAIN CONTAINER, A VARIABLE VOLTAGE SOURCE PRODUCING A SECOND SIGNAL REPRESENTING THE REQUIRED WEIGHT OF A MATERIAL, A DIFFERENCE AMPLIFIER TO WHICH SAID FIRST SIGNAL AND SAID SECOND SIGNAL ARE APPLIED, AND ELECTRICAL CONTROL MEANS OPERABLE BY THE OUTPUT FROM SAID DIFFERENCE AMPLIFIER FOR CONTROLLING OPENING AND CLOSING OF THE DISCHARGE MEANS TO SUCCESSIVELY FEED DIFFERENT MATERIALS TO THE MAIN CONTAINER, SAID ELECTRICAL CONTROL MEANS AUTOMATICALLY ADJUSTING THE SETTING OF SAID VARIABLE VOLTAGE SOURCE AFTER EACH MATERIAL IS DELIVERED WHEREBY AT ANY TIME SAID SECONE SIGNAL REPRESENTS THE SUM OF THE WEIGHTS OF MATERIAL DELIVERED TO THE MAIN CONTAINER PLUS THE REQUIRED WEIGHT OF THE NEXT MATERIAL TO BE DELIVERED TO THE MAIN CONTAINER.