Crank type injection apparatus

Details Crank type injection apparatus Crank type injection apparatus

B - Operations, Transporting

29

C

B29C 45/50 (2006.01)

Patent

CA 2044594

A B S T R A C T A low-priced crank type injection apparatus capable of driving an injection screw with a desired driving force without the need of emplying a high output type electric motor. The injection apparatus includes a crank mechanism (20) for converting forward and reverse rotation of a driving shaft (21), coupled through a reduction gearing (50) to an output shaft (41) of a servomotor (40) controlled by a numerical control device (60), into reciprocating motion of the injection screw mounted on a pusher plate (10), and operates, during the injection process, to cause the injection screw to move forwardly with a great driving force, by the servomotor via the reduction gearing and the crank mechanism. The servomotor is rotated in such a manner that the driving shaft is driven forwardly within a predetermined rotary angular region corresponding an operational region which does not include upper and lower (lead centers of the crank mechanism and the vicinities of the dead centers, to thereby prevent rapidly changes in the injection speed and in the changing rate of injection pressure, which respectively change in dependence on the rotary angle of the driving shaft.

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