Dual-headed, adjustable optoelectronic image reader

摘要

An optoelectronic sensing device detects two contrasting marks arranged next to each other along two reading tracks on a moving web. An optical head is arranged above each reading track. Each head has a lighting source and a lens, by means of which the contrast marks are imaged on an associated light receiver. Information from the contrast mark is obtained from the output signal of the light receiver. An adjustable connector joins two substantially identical optical heads to each other so that their respective lenses are arranged asymmetrically in the associated optical head and are situated in immediate proximity to each other, which permits adjustment of the device for the smallest possible track spacings.