Dual purpose shutter arrangement for a slide projector

Claim 1

A SLIDE PROJECTOR COMPRISING A HOUSING, A LENS UNIT SLIDABLY MOUNTED IN SAID HOUSING, A SHUTTER DEVICE, AN OPERATING SHAFT FOR SAID SHUTTER DEVICE, MECHANISM DISPOSED WITHIN SAID HOUSING FOR OPERATING SAID PROJECTOR IN SUCCESSIVE CYCLES OF OPERATION, SAID MECHANISM INCLUDING A CAM ASSEMBLY, SAID CAM ASSEMBLY INCLUDING A SHUTTER CAM AND A CYCLING CAM, AND MEANS FOR ROTATING SAID CAM ASSEMBLY, MEANS PROVIDING A MECHANICAL CONNECTION BETWEEN SAID SHUTTER CAM AND SAID OPERATING SHAFT WHEREBY SAID SHUTTER DEVICE WILL BE OPERATED ONCE DURING EACH CYCLE OF OPERATION, MEANS CONTROLLED BY SAID CYCLING CAM FOR TERMINATING THE CYCLE OF OPERATION WHILE SAID SHUTTER IS IN OPEN POSITION, SAID SHUTTER DEVICE BEING MOUNTED WITHIN SAID LENS UNIT SO THAT IT FORMS A PART THEREOF AND IS MOVABLE THEREWITH IN SAID HOUSING, SAID SHUTTER DEVICE INCLUDING A SLEEVE HAVING A NONCIRCULAR OPENING FOR SLIDABLY RECEIVING SAID OPERATING SHAFT, SAID OPERATING SHAFT HAVING A NONCIRCULAR CROSS SECTION WHICH IS RECEIVED WITHIN SAID SLEEVE SO THAT A DRIVING CONNECTION MAY BE PROVIDED BETWEEN SAID OPERATING SHAFT AND SAID SHUTTER DEVICE WITHOUT IMPAIRING THE SLIDABLE MOVEMENT OF SAID LENS UNIT, AND ADDITIONAL MEANS MOVABLE INTO ENGAGEMENT WITH SAID MECHANICAL CONNECTION PROVIDING MEANS FOR OPERATING SAID SHUTTER FROM ITS OPEN POSITION INTO A PARTIALLY CLOSED POSITION.