The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 1980
Filed:
May. 16, 1978
Kenneth A Hams, Nazareth, PA (US);
Bell & Howell Company, Phillipsburg, NJ (US);
Abstract
This invention concerns a photoelectric skew detection system which checks the alignment of rectangular articles travelling on a conveyor. The mechanism comprises four phototransistors (1,2,3, and 4) arranged in a narrow rectangular pattern. Two lamps (8,9) are provided, each lamp illuminating only the two phototransistors forming corners for a narrow dimension of the rectangle. If a trailing edge (6a) of a given rectangular article (6) crosses either of the two forward phototransistors (3,4), both of the two rearward phototransistors (1 and 2) must be lit. If one is not lit, an electrical circuit generates an error signal. In this manner, the mechanism simultaneously detects both skew conditions and a faulty lamp.