Method of injection molding utilizing accumulating chambers

Claim 1

IN A METHOD OF OPERATING A MOLDING MACHINE HAVING SEPARABLE MOLD SECTINS DEFINING A MOLD CAVITY, THE STEPS OF SECURING SAID SECTIONS TOGETHER SOLELY BY APPLYING CLAMPING FORCES THERETO AT A PLURALITY OF SPACED LOCATIONS THEREABOUT, CONTINUOUSLY FEEDING MATERIAL TO A VARIABLE VOLUME CHAMBER, INTERMITTENTLY DELIVERING MOLD MATERIAL FROM SAID VARIABLE VOLUME CHAMBER TO SAID CAVITY AT A PLURALITY OF SPACED LOCATIONS THEREIN, AND CLOSING OFF THE CAVITY FROM MATERIAL FED THERETO IN RESPONSE TO THE BACK PRESSURE OF MATERIAL FILLING SAID CAVITY.

Claim 3

THE METHOD OF OPERATING A MOLDING MACHINE HAVING SEPARABLE MOLD SECTIONS DEFINING A MOLD CAVITY, COMPRISING THE STEPS OF CONTINUOUSLY DELIVERING A SUPPLY OF MOLD MATERIAL TO A VARIABLE VOLUME CHAMBER, INTERMITTENTLY CONDUCTING MOLD MATERIAL FROM SAID VARIABLE VOLUME CHAMBER TO AN INJECTION CYLINDER, INTERMITTENTLY INJECTING MOLD MATERIAL FROM SAID INJECTION CYLINDER TO THE MOLD CAVITY, AUTOMATICALLY CONTROLLING COMMUNICATION BETWEEN THE VARIABLE VOLUME CHAMBER AND THE INJECTION CYLINDER IN RESPONSE TO THE DIFFERENTIAL PRESSURE THEREBETWEEN, INCREASING THE VOLUME OF SAID VARIABLE VOLUME CHAMBER SO THAT THE CONTINUOUSLY DELIVERED MOLD MATERIAL IS TEMPORARILY STORED IN SAID VARIABLE VOLUME CHAMBER WHEN SAID COMMUNICATION IS CUT-OFF, DECREASING THE VOLUME OF SAID VARIABLE VOLUME CHAMABER TO EXPEL SAID TEMPORARILY STORED MOLD MATERIAL TO SAID INJECTION CYLINDER WHEN COMMUNICATION IS AUTOMATICALLY ESTABLISHED BETWEEN THE VARIABLE VOLUME CHAMBER AND THE INJECTION CYLINDER, AND REGULATING, INDEPENDENTLY OF THE SAID AUTOMATIC COMMUNICATION CONTROL, THE FLOW OF MOLDABLE MATERIAL FROM SAID INJECTION CYLINDER TO SAID MOLD CAVITY.

Claim 4

THE METHOD OF OPERATING A MOLDING MACHINE HAVING SEPARABLE MOLD SECTIONS DEFINING A MOLD CAVITY, COMPRISING THE STEPS OF CONTINUOUSLY DELIVERING A SUPPLY OF MOLD MATERIAL TO A VARIABLE VOLUME CHAMBER, INTERMITTENTLY CONDUCTING MOLD MATERIAL FROM SAID VARIABLE VOLUME CHAMBER TO AN INJECTION CYLINDER, INTERMITTENTLY INJECTING MOLD MATERIAL FROM SAID INJECTION CYLINDER TO THE MOLD CAVITY, AUTOMATICALLY CONTROLLING COMMUNICATION BETWEEN THE VARIABLE VOLUME CHAMBER AND THE INJECTION CYLINDER IN RESPONSE TO THE DIFFERENTIAL PRESSURE THEREBETWEEN, INCREASING THE VOLUME OF SAID VARIABLE VOLUME CHAMBER SO THAT THE CONTINUOUSLY DELIVERED MOLD MATERIAL IS TEMPORARILY STORED IN SAID VARIABLE VOLUME CHAMBER WHEN SAID COMMUNICATION IS CUT-OFF, DECREASING THE VOLUME OF SAID VARIABLE VOLUME CHAMABER TO EXPEL SAID TEMPORARILY STORED MOLD MATERIAL TO SAID INJECTION CYLINDER WHEN COMMUNICATION IS AUTOMATICALLY ESTABLISHED BETWEEN THE VARIABLE VOLUME CHAMBER AND THE INJECTION CYLINDER, AND REGULATING, INDEPENDENTLY OF THE SAID AUTOMATIC COMMUNICATION CONTROL, THE FLOW OF MOLDABLE MATERIAL FROM SAID INJECTION CYLINDER TO SAID MOLD CAVITY.