Patent ID: 7455514
Filing Date: 2008-11-25
Classification: B29C

Abstract:
1. An inverting transfer mechanism of a blow molding apparatus for receiving preforms or blow-molded products that are upright or inverted and are transported along a first circular transportation passage, inverting a posture of the preforms or blow-molded products while transporting the preforms or blow-molded products along a second circular transportation passage, and transferring the preforms or blow-molded products to a third circular transportation passage, comprising: a turntable; cylindrical members that extend radially on a surface of the turntable with a center of rotation of the turntable as a center and are rotatably supported by the turntable; shaft members that extend through hollow portions of the cylindrical members and rotate integrally with the cylindrical members; grippers that are attached to outer ends of the shaft members, are each capable of holding an opening part of the preform or the blow-molded product, and move along the second circular transportation passage when the turntable rotates; and a rotating cam mechanism that causes the cylindrical members to rotate by 180° as the turntable rotates; wherein the rotating cam mechanism comprises: first and second cam followers formed on sliders capable of reciprocal movement in an axial direction of each cylindrical member; first cam grooves, each of which is formed in a spiral across a 180° angle range in an outer circumferential surface of each cylindrical member and along which the respective first cam followers slide; and a second cam groove that is formed in a surface of a fixed disc and along which the respective second cam followers slide, wherein the second cam groove has a shape such that the sliders move reciprocally in a radial direction in accordance with rotation of the turntable.