Abstract: The present invention discloses a control method, and a shift register for carrying out the control method, for use with an intermittently moving mechanism designed to automatically perform various inspections and operations with respect to a product, wherein the inspection result signals and/or operation instruction signals are placed in correspondence to a plurality of successively fed products, and wherein exterior instruction signals may be entered at suitable times, and wherein a plurality of different inspection result signals and/or operation instruction signals may be issued by a single device. These inspection result signals and operation instruction signals may or may not be shifted to other inspection and operation positions to thereby use the mechanism in a variety of modes.

Abstract: The present invention discloses an arrangement wherein a wall thickness of a plastic bottle formed by means of a blow-molding process is formed into the desired configuration by controlling the wall thickness of a parison from which the bottle is made. A control pin arranged opposite an extrusion outlet of an extruding machine for adjusting the wall thickness of the parison is finely moved in response to a fine step-like control voltage signal to thereby suitably set and vary the opening degree of the extrusion outlet of the extruding machine, thus obtaining the desired wall thickness for the parison.