Patent ID: 7726965

Claim:
A multiple gate injection molding machine, comprising: a plurality of resin injecting nozzles with nozzle gates, each of said nozzles having a gate pin disposed therein and movable between an open position opening the respective nozzle gate when resin pressure in the respective nozzle exceeds a predetermined value and a closed position closing the respective nozzle gate when resin pressure in the respective nozzle falls below the predetermined value; and a nozzle gate opening and closing mechanism including timing pins disposed on at least a portion of surfaces of an injection mold opposing said nozzle gates and movable in advancing directions toward said nozzle gates and retracting directions away from said nozzle gates between advance positions closing the respective nozzle gates and retracted positions opening said nozzle gates; whereby said nozzle gates are opened and closed by one of movement of said timing pins only and by coordinate movement of said gate pins and said timing pins.