Disposable camera with simplified film advance and indicator

A disposable camera including a spring biased, rotatable film wind up roll;

• an end piece mounted on the wind up roll and bearing a circular groove thereon, and a plurality of equidistant stops spaced within the groove;
• a film supply roll for feeding the wind up roll;
• a downwardly biased member attached to the camera body and including a spring biased sheet with an engagement finger adapted to provide a sliding fit with the groove of the end piece to releasably engage the stops within the grooves and prevent rotation of the film wind up roll when thus engaged;
• a lens;
• a shutter;
• a spring biased shutter actuator, indluding a retaining finger having a shallow indent, the retaining finger being adapted to elevate the engagement finger out of contact with a groove stop upon release of the shutter until the downwardly biased member engages a succeeding stop in the groove, and continued elevation of the shutter causes the retaining finger and downwardly biased member to separate, and the engagement finger to re-enter the groove and prevent further film windup when the engagement finger contacts a succeeding stop;
• an edge portion of the downwardly biased member being sized to contact the indent of the retaining finger and stabilize movement of the engagement finger within the groove.