INLINE SCREW TYPE INJECTION MOLDING MACHINE AND METHOD OF CONTROLLING THE SAME

• Main Author: YAMADA, AKIO
• Format: Patent
• Language: English; French; German
• Published: 12.01.2011
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The invention is to provide an in-line screw type injection molding machine which can have a simplified configuration of an injection mechanism and a metering mechanism. The in-line screw type injection molding machine is characterized by comprising: a metering motor 9 which rotationally drives a rear end side of a screw; a screw mechanism which includes a nut body rotating integrally with the screw, and a screw shaft fitted to the nut body, the screw mechanism converting rotational motion of the screw shaft into linear motion of the screw through the nut body; an injection motor 16 which rotationally drives the screw shaft; an injection motor drive circuit which drives the injection motor 16 to allow a position of the screw to follow a predetermined position command pattern; a metering motor drive circuit which drives the metering motor 9 to allow rotation of the metering motor 9 to follow a predetermined speed setting pattern; and an adder-subtracter circuit which adds or subtracts a speed setting pattern signal of the metering motor drive circuit to or from a speed command signal of the injection motor drive circuit so as to compensate an axial displacement of the screw caused by the rotation of the metering motor 9.