Transparent slide projector

Claim 1

A SLIDE PROJECTOR APPARATUS FOR SELECTIVELY REVERSIBLY DRIVING A PROJECTION SLIDE MAGAZINE ONE SLIDE POSITION COMPRISING A DRIVE WHEEL MOUNTED FOR ROTATION ABOUT AN AXIS, A PORTION OF SAID WHEEL BEING ADAPTED FOR MESHING WITH A PORTION OF A MAGAZINE, PAWL MEANS COMPRISING AN ADVANCING PAWL ARM AND A REVERSING PAWL ARM, A PORTION OF SAID DRIVE WHEEL BEING ADAPTED TO THE ENGAGED BY SAID PAWL ARMS, A CARRIER ON WHICH SAID PAWL MEANS ARE MOVEABLY MOUNTED, BIASING MEANS TENDING TO BIAS THE PAWL MEANS WITH RESPECT TO THE CARRIER SO AS TO MAINTAIN EITHER THE ADVANCING PAWL ARM OR THE REVERSING PAWL ARM IN OPERATIVE POSITION, REVERSING MEANS FOR SHIFTING SAID PAWL MEANS WITH RESPECT TO SAID CARRIER TO REMOVE THE ADVANCING PAWL ARM FROM AN OPERATIVE POSITION AND PLACE THE REVERSING PAWL ARM IN AN OPERATIVE POSITION WHILE THE CARRIER IS IN A FIRST TERMINAL POSITION, MEANS FOR MOVING THE CARRIER FROM THE FIRST TERMINAL POSITION TO A SECOND TERMINAL POSITION TO CAUSE THE PAWL ARM BEING BIASED IN AN OPERATIVE POSITION TO ENGAGE A PORTION OF SAID DRIVE WHEEL AND ROTATE THE DRIVE WHEEL THROUGH A PREDETERMINED ANGLE WHICH MOVES THE MAGAZINE ONE SLIDE POSITION, MEANS FOR RETURNING THE CARRIER FROM THE SECOND TERMINAL POSITION TO THE FIRST TERMINAL POSITION, AND PAWL DISENGAGING MEANS FOR POSITIONING SAID PAWL MEANS IN A NEUTRAL POSITION WITH SAID PAWL ARMS DISENGAGED FROM THE DRIVE WHEEL WHEN SAID CARRIER IS IN THE SECOND TERMINAL POSITION, SAID BIASING MEANS BEING ADAPTED TO BIAS THE PAWL MEANS TO PLACE THE ADVANCING PAWL ARMS IN AN OPERATIVE POSITION WHEN SAID PAWL MEANS IS REMOVED FROM SAID NEUTRAL POSITION BY THE RETURN OF THE CARRIER FROM THE SECOND TERMINAL POSITION TOWARD THE FIRST TERMINAL POSITION TO ENSURE A MAGAZINE ADVANCING OPERATION DURING THE NEXT CYCLE OF OPERATION OF THE PROJECTOR IN THE ABSENCE OF A SUBSEQUENT OPERATION OF SAID REVERSING MEANS.