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:
Jun. 29, 1976
Filed:
Jul. 02, 1975
James G Woodier, Morton Grove, IL (US);
Bell & Howell Company, Chicago, IL (US);
Abstract
The disclosure relates to a forward-reverse film transport synchronizing mechanism for a motion picture projector film feed apparatus of the type including a shuttle which is driven for vertical reciprocating motion by a transport cam. The mechanism of the present invention includes a rotary shutter which is driven by a rotating shaft and includes a pair of drive lugs arcuately spaced by 180.degree. and axially spaced from one another. A transport cam drive means coupled to the transport cam and including a driven lug which is selectably engageable with one or the other drive lugs causes the transport cam to rotate when the rotating shaft rotates. Because the driven lug is selectably engageable with either of the drive lugs, the angular relation of the transport cam relative to the rotary shutter may be varied by 180.degree. thus providing properly synchronized forward and reverse film transportation without requiring reversal of the angular direction of rotation of the rotating shaft.