Mold-pressing apparatus incorporating electric servo motor and linking mechanism

A mold pressing apparatus with an electric servo motor and link mechanism for pressurizing and heating molding material to form an article comprising:

• an upper and a lower mold having heating means;
• a reversible electric servo motor capable of rotating in forward and reverse directions;
• a linking mechanism comprising a plurality of link assemblies which connect the motor to the lower mold by a rotation to reciprocation conversion means to drive the lower mold toward and away from the upper mold;
• a numeral control circuit connected to the motor, forming a mold-driving controller for controlling the movement of the mold;
• an upper-mold retention means for maintaining a predetermined clearance between said upper and lower molds by securely holding said upper mold against said lower mold using said upper-mold retention means inserted between said upper and lower molds, said upper-mold retention means comprising a plurality of cylindrical space holders each having a slot so that each space holder is longitudinally connectable to upper mold slide guides which extend vertically from said lower mold and extend through said upper mold.