Tenter-type stretcher having means for detecting clip obstructions

摘要

An improved tenter-type stretcher comprises a pair of rails which diverge from one another, a plurality of clips carried in endless chains along the rails and a device for detecting obstructions in the tenter clips, wherein the detecting device is either a mechanical arm positioned to contact and move upon encountering foreign matter in the clips or a light beam which traverses the clips, and is interrupted by foreign matter in the clips.