Blow-molding apparatus

A transfer mechanism of a blow molding apparatus that receives preforms, blow-molded products, or mandrels transported at a first feed pitch along a first circular transportation passage, changes a feed pitch from the first feed pitch to a second feed pitch while transporting the preforms, blow-molded products, or mandrels along a second circular transportation passage, and transfers the preforms, blow-molded products, or mandrels to a third circular transportation passage, comprising:

• a turntable;
• a circular guide rail fixed to a surface of the turntable so that a center thereof is at a rotational center of the turntable;
• a plurality of sliders capable of sliding along the circular guide rail;
• holding parts formed on the respective sliders for holding the preforms, blow-molded products, or mandrels;
• pivot pins that are rotatably disposed at intervals of a fixed angle on a circle that is concentric with the rotational center of the turntable in an inside position of the circular guide rail on the turntable;
• a plurality of swinging arms that swing along a surface of the turntable about the respective pivot pins as the turntable rotates;
• and
• slide-type linking parts that link swinging ends of the swinging arms to the respective sliders so as to allow the sliders to slide in an axial direction of the swinging arms.