(under subclass 360) Device in which the detector* includes a light-sensitive means responsive to light impinging on said means to energize an electrical circuit and the detection of work is effected by a change in the quantity or quality of the light received by said means either directly (as by work's moving between said means and the source of said light), or indirectly (as by reflection from the work).
(1) Note. Examples of the means referred to above are vacuum tubes and light-sensitive detectors.
(2) Note. Included herein are patents in which a beam of light is reflected from the work or an index mark thereon to the light-sensitive-means, as well as patents in which the work covers and uncovers the light-sensitive means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
72+, for a photo-electric work-sensor in a "self-regulating" device.
289, for a photo-electric work-sensor in a "flying" cutter device.
