Weighing control system

Claim 1

A SYSTEM FOR CONTROLLING THE WEIGHT OF MATERIAL SUPPLIED AT A BULK RATE AND AT A TRICKLE RATE FROM A SOURCE TO A RECEIVER COMPRISING A COMMAND SOURCE FOR PRODUCING A FIRST POLARITY OF CURRENT HAVING A MAGNITUDE PROPORTIONAL TO THE DESIRED WEIGHT OF MATERIAL, A WEIGHT SOURCE COUPLED TO SAID RECEIVER FOR PRODUCING A SECOND AND OPPOSITE POLARITY OF CURRENT HAVING A MAGNITUDE PROPORTIONAL TO THE WEIGHT OF MATERIAL SUPPLIED TO SAID RECEIVER, A TARE SOURCE FOR PRODUCING A CURRENT HAVING SAID FIRST POLARITY AND HAVING A VARIABLE MAGNITUDE AN OFFSET SOURCE FOR PRODUCING A CURRENT HAVING SAID SECOND POLARITY AND HAVING A MAGNITUDE PROPORTIONAL TO THE WEIGHT OF MATERIAL TO BE SUPPLIED AT SAID TRICKLE RATE, MEANS SELECTIVELY ENERGIZING SAID OFFSET SOURCE, A COMMON SUMMING JUNCTION COUPLED TO SAID COMMAND, WEIGHT, TARE, AND OFFSET SOURCES, MEANS COUPLED TO SAID JUNCTION FOR PRODUCING A CONTROL SIGNAL INDICATIVE OF THE RELATIVE MAGNITUDES OF SAID CURRENTS, MEANS COUPLED TO SAID PRODUCING MEANS AND TO SAID TARE SOURCE FOR CHANGING SAID TARE CURRENT TO A MAGNITUDE PROPORTIONAL TO THE TARE WEIGHT OF SAID RECEIVER, MEANS COUPLED TO SAID PRODUCING MEANS AND TO SAID MATERIAL SOURCE FOR SUPPLYING SAID MATERIAL AT SAID BULK RATE IN RESPONSE TO THE MAGNITUDE OF SAID FIRST POLARITY CURRENTS EXCEEDING MAGNITUDE OF SAID SECOND POLARITY CURRENTS, MEANS COUPLED TO SAID PRODUCING MEANS AND TO SAID OFFSET SOURCE FOR REMOVING SAID OFFSET CURRENT IN RESPONSE TO THE MAGNITUDE OF SAID SECOND POLARITY CURRENTS EXCEEDING THE MAGNITUDE OF SAID FIRST POLARITY CURRENTS, AND MEANS COUPLED TO SAID PRODUCING MEANS AND TO SAID MATERIAL SOURCE FOR SUPPLYING SAID MATERIAL AT SAID TRICKLE RATE IN RESPONSE TO THE REMOVAL OF SAID OFFSET CURRENT AND IN RESPONSE TO THE MAGNITUDE OF SAID FIRST POLARITY CURRENTS EXCEEDING THE MAGNITUDE OF SAID SECOND POLARITY CURRENT.

Claim 2

A SYSTEM FOR CONTROLLING THE WEIGHT OF MATERIAL SUPPLIED AT A BULK RATE AND AT A TRICKLE RATE FROM A SOURCE TO A RECEIVER COMPRISING A COMMAND SOURCE FOR PRODUCING A FIRST POLARITY OF CURRENT HAVING A MAGNITUDE PROPORTIONAL TO THE DESIRED WEIGHT OF MATERIAL, A WEIGHT SOURCE COUPLED TO SAID RECEIVER FOR PRODUCING A SECOND AND OPPOSITE POLARITY OF CURRENT HAVING A MAGNITUDE PROPORTIONAL TO THE WEIGHT OF MATERIAL SUPPLIED TO SAID RECEIVER, A TARE SOURCE FOR PRODUCING A CURRENT HAVING SAID FIRST POLARITY AND HAVING A VARIABLE MAGNITUDE AN OFFSET SOURCE FOR PRODUCING A CURRENT HAVING SAID SECOND POLARITY AND HAVING A MAGNITUDE PROPORTIONAL TO THE WEIGHT OF MATERIAL TO BE SUPPLIED AT SAID TRICKLE RATE, MEANS SELECTIVELY ENERGIZING SAID OFFSET SOURCE, A COMMON SUMMING JUNCTION COUPLED TO SAID COMMAND, WEIGHT, TARE, AND OFFSET SOURCES, MEANS COUPLED TO SAID JUNCTION FOR PRODUCING A CONTROL SIGNAL INDICATIVE OF THE RELATIVE MAGNITUDES OF SAID CURRENTS, MEANS COUPLED TO SAID PRODUCING MEANS AND TO SAID TARE SOURCE FOR CHANGING SAID TARE CURRENT TO A MAGNITUDE PROPORTIONAL TO THE TARE WEIGHT OF SAID RECEIVER, MEANS COUPLED TO SAID PRODUCING MEANS AND TO SAID MATERIAL SOURCE FOR SUPPLYING SAID MATERIAL AT SAID BULK RATE IN RESPONSE TO THE MAGNITUDE OF SAID FIRST POLARITY CURRENTS EXCEEDING MAGNITUDE OF SAID SECOND POLARITY CURRENTS, MEANS COUPLED TO SAID PRODUCING MEANS AND TO SAID OFFSET SOURCE FOR REMOVING SAID OFFSET CURRENT IN RESPONSE TO THE MAGNITUDE OF SAID SECOND POLARITY CURRENTS EXCEEDING THE MAGNITUDE OF SAID FIRST POLARITY CURRENTS, AND MEANS COUPLED TO SAID PRODUCING MEANS AND TO SAID MATERIAL SOURCE FOR SUPPLYING SAID MATERIAL AT SAID TRICKLE RATE IN RESPONSE TO THE REMOVAL OF SAID OFFSET CURRENT AND IN RESPONSE TO THE MAGNITUDE OF SAID FIRST POLARITY CURRENTS EXCEEDING THE MAGNITUDE OF SAID SECOND POLARITY CURRENT.