Control circuits for weight checking apparatus

Claim 1

WEIGHT CORRECTING APPARATUS COMPRISING AN ARTICLE WEIGHT SUPPLEMENTING DEVICE, MEANS FOR PRODUCING A WEIGHT SUPPLEMENTING SIGNAL WHEN THE ARTICLE WEIGHT IS OF A PREDETERMINED VALUE, RELAY MEANS FOR STARTING AND STOPPING SAID SUPPLEMENTING DEVICE, A MONOSTABLE MULTIVIBRATOR CONNECTED TO SAID WEIGHT SUPPLEMENTING SIGNAL PRODUCING MEANS, A GRID CONTROLLED GAS TRIGGER TUBE HAVING ITS GRID CONNECTED TO THE NORMALLY NON-CONDUCTING SECTION OF SAID MULTIVIBRATOR, SAID RELAY MEANS HAVING ONE COIL TERMINAL CONNECTED TO THE PLATE OF SAID GAS TUBE, A SOURCE OF POSITIVE VOLTAGE CONNECTED TO THE OTHER COIL TERMINAL, A NORMALLY OPEN SWITCH HAVING ONE CONTACT CONNECTED TO GROUND, A PULSE CONDENSER AND A CURRENT LIMITING RESISTOR CONNECTED BETWEEN THE PLATE OF SAID GAS TUBE AND THE OTHER CONTACT OF SAID SWITCH, A CHARGING CONDENSER AND A RESISTOR CONNECTED BETWEEN GROUND AND THE OTHER TERMINAL OF SAID RELAY COIL, SAID CHARGING CONDENSER ALSO BEING CONNECTED TO SAID PULSE CONDENSER, AND MEANS MECHANICALLY CONNECTED TO SAID SUPPLEMENTING DEVICE FOR CLOSING SAID SWITCH NEAR THE END OF A SUPPLEMENTING CYCLE AND THEN OPENING SAID SWITCH AS SAID DEVICE COMPLETES A SUPPLEMENTING CYCLE IN RESPONSE TO SAID WEIGHT SUPPLEMENTING SIGNAL, OPENING OF SAID SWITCH CAUSING SAID CHARGING CONDENSER TO BRING THE SWITCH CONNECTED PLATE OF SAID PULSE CONDENSER TO SAID SOURCE VOLTAGE, CLOSING OF SAID SWITCH GROUNDING SAID PULSE CONDENSER TO EXTINGUISH SAID GAS TUBE, SAID PULSE CONDENSER CHARGING AND CAUSING PLATE VOLTAGE ON SAID GAS TUBE TO BECOME REESTABLISHED IN CASE SAID SWITCH IS LEFT IN THE CLOSED POSITION UPON COMPLETION OF A SUPPLEMENTING CYCLE, SO THAT A NEW CYCLE CAN BE INITIATED UPON RECEIPT OF THE NEXT WEIGHT SUPPLEMENTING SIGNAL.