Patent ID: 7748974

Claim:
A molding machine comprising: a base; a carriage disposed movably on said base; a first mold secured immovably to said carriage; a second mold disposed slidably on said carriage for moving toward or away from said first mold; a driving unit including a driver and a driving screw rotated by said driver, said driving screw being attached rotatably to said carriage and connected drivingly to said second mold; a synchronous transmission unit connected to said second mold and said carriage for moving said carriage synchronously with said second mold so that said first mold is moved along with said carriage to contact said second mold; a push unit including a pressure cylinder, a push shaft inserted telescopically into said pressure cylinder and having a piston, first and second cylinder chambers disposed in said pressure cylinder on two sides of said piston, and a passage tube connected to said second cylinder chamber, said push shaft extending outwardly through said second cylinder chamber and connected to said second mold for pushing said second mold against said first mold; a pressure booster including a booster tube, a booster actuator, and a booster rod connected telescopically to said booster actuator to move into or out of said booster tube so as to transfer pressure in said booster tube to said first cylinder chamber; and a valve mechanism having a valve casing connected fluidly to said first and second cylinder chambers, said passage tube, and said booster tube, and a check valve disposed in said valve casing to control fluid communication among said first and second cylinder chambers, said passage tube, and said booster tube.