| 摘要 |
An alignment system having a light source for projecting a reference light beam extending longitudinally with and parallel to the centerline of a roller conveyor for establishing a common reference plane containing the axes of a plurality of transversely extending conveyor rolls. Preferably, the light beam is spaced within a specified distance from the ends of the conveyor rolls. The system includes a laser having a beam expander for reducing the divergence of the light beam over long distances, a penta prism for bending the incident light beam at right angles from its projected path and directing the bent light beam against a mirror attached to an end of one of the conveyor rolls. The mirror reflects the beam back to the penta prism which, in turn, directs the reflected beam against a target located at the light source whereat the reflection of the light beam on the target is used for accurately determining the alignment relationship of that particular conveyor roll to the incident light beam.
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