Optical Inspection of Plastic Parisons Using Stationary Camera

The patent applies the dynamics principle by making the camera movable rather than stationary. The camera moves synchronously with the parison at the same speed and in the same direction, eliminating relative motion between the camera and the inspection target. This dynamic positioning allows the camera to capture clear, high-quality images of the screw thread and cavity number even when the parison is moving at high bottling line speeds, thus resolving the contradiction between inspection speed and image quality.

The patent applies the universality principle by designing a single inspection station with a movable camera that can inspect multiple critical features of the parison. The camera is positioned and oriented to capture images of both the screw thread and the cavity number on the parison mouth end. This multi-functional approach allows one inspection station to perform what would traditionally require multiple separate stations, thereby reducing apparatus complexity and overall dimensions while maintaining comprehensive inspection capability.

The patent applies the dynamics principle by positioning the camera in a location that moves synchronously with the parison rather than keeping it stationary laterally. The camera follows the parison's motion, maintaining a consistent relative position that allows clear capture of the cavity number and screw thread features even at high speeds. This dynamic positioning eliminates the blurring and distortion that would occur with a stationary lateral camera position, thus maintaining detection precision while enabling high-speed operation.