Patent ID: 8047832
Filing Date: 2011-11-01
Classification: B29C

Abstract:
1. In an injection/stretch blow molding machine comprising an injection/stretch blow unit and an injection unit, the injection/stretch blow unit including a lower base platen installed on a bed, an upper base platen supported vertically movably by a hydraulic lift cylinder, a space being formed between the lower base platen and the upper base platen and used as a work space, a transfer platen installed on an underside of the upper base platen so as to be rotatable intermittently, and a vertical injection mold clamping mechanism installed in an injection molding operation section, the injection molding operation section being defined at a stop position of neck molds provided on a lower surface of the transfer platen, the injection unit being installed on the bed toward the injection mold clamping mechanism, the injection/stretch blow molding machine improved in that the injection mold clamping mechanism comprising: a pair of mold clamping shafts erected vertically movably on both sides of the injection molding operation section and extending through both the lower base platen and the upper base platen, upper end portions of the mold clamping shafts being connected together through a top platen; a plurality of hydraulic mold clamping means connected respectively to lower ends positioned within the bed of the mold clamping shafts, the mold clamping shafts being attached to an underside of the lower base platen; a mold clamping platen having, in the center of a lower surface thereof, a mold clamping block to which core molds are attached downwards, the mold clamping platen being fitted and supported at both end portions thereof on the mold clamping shafts and installed vertically movably between the upper base platen and the top platen; a pair of mold opening/closing cylinders connecting, on both sides thereof, the upper base platen and the mold clamping platen with each other and causing the mold clamping platen to move vertically with respect to the upper base platen; a mold clamping rod connected to the center of an upper surface of the mold clamping platen through a central opening of the top platen; and a pair of clamp members disposed on both sides of the opening in the upper surface of the top platen so as to be movable forward and backward, the clamp members being adapted to be engaged with the mold clamping rod by pneumatic clamp cylinders to connect the mold clamping platen and the mold clamping shafts with each other.