B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/680
B29C 45/02 (2006.01) B29C 45/20 (2006.01) B29C 45/30 (2006.01) B29C 45/77 (2006.01)
Patent
CA 2012789
ABSTRACT OF THE DISCLOSURE An apparatus and method for controlling injection of a moldable material into a mold cavity is disclosed. The apparatus includes a die defining a mold cavity for receiving the moldable material, and an injection chamber for containing the moldable material to be injected into the mold cavity. The moldable material is displaced from a cylinder and piston assembly through a conduit into the mold cavity. The piston is driven via a rotary to linear motion converter coupled to a motor driven rotating power shaft. The rate of advancement of the piston relative to the cylinder is monitored by a resolver which detects rotation of the power shaft to thereby determine the rate of displacement and amount of moldable material being conducted into the mold cavity. A closed loop servo feedback controller is operably connected to the resolver and to the motor powering the piston to provide continuous closed loop feedback control over the rate and amount of displacement of moldable material conducted into the mold cavity.
Ernst Otto F.
Kring David L.
Lewis Larry A.
Ernst Otto F.
Howmet Corporation
Kirby Eades Gale Baker
Kring David L.
Lewis Larry A.
LandOfFree
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