B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/713
B29C 45/38 (2006.01) B29C 45/40 (2006.01)
Patent
CA 1327261
ABSTRACT OF THE DISCLOSURE An injection molding machine employing a mold for molding, e.g., disk-shaped recording medium carriers. A mold-mounting plate has a front surface allowing the mold to be the mounted thereon. A gate-cutting punch is slidably inserted in a hole extending through the plate and opening in the front and rear surfaces of the plate. A bore extends longitudinally in the center of the punch, and an ejector pin is slidably inserted in the bore. A gate-cutting drive cylinder is mounted on the rear surface of the mold-mounting plate, and has a piston capable of abutting against the rear end of the gate-cutting punch. The piston is formed with a stepped bore having a large-diameter front portion and a small-diameter rear portion which are aligned on the same axial line. An ejector rod extends through the stepped bore, and has a large-diameter portion slidable within the large-diameter portion of the stepped bore, the front end of the ejector rod being capable of abutting against the rear end of the ejector pin. A sprue-ejecting drive cylinder is provided behind the gate-cutting drive cylinder on the same axial line, and has a piston rod connected to the rear end of the ejector rod. Thus, the machine includes no hydraulic cylinders incorporated in the mold, thereby eliminating various drawbacks conventionally encountered.
612770
Fetherstonhaugh & Co.
Sumitomo Heavy Industries Ltd.
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