Automatic film-rewinding device for projector

Claim 1

An automatic film-rewinding device in a sprocketless-type projector containing a claw for intermittently feeding film, a pressure plate for urging the film against a gate plate, and a supply reel mounted on a shaft adapted to be rotated by following the direction of rotation of a shutter shaft and having the terminal end of the film secured thereto, and being adapted to be driven by a driving motor adapted to rotate only in one direction, said device comprising: a tension member adapted to engage the film between the supply reel and the gate and capable of swinging to absorb the tension produced in the film between said supply reel and said gate when the claw forces the film to travel downwardly by its engagement therewith, main member adapted to be relieved of its locked condition by the swinging movement of said tension member and capable of pushing both the gate plate and the pressure plate by virtue of its rotation resulted from said relief of the main member from its state of being locked to thereby set the film free from the claw, the gate plate and the pressure plate, a first idler adapted to engage the shaft of the driving motor, a second idler adapted to engage said first idler, a movable member capable of being moved by virtue of the rotation of said main member, a swingable member provided with said first idler, said second idler and said movable member a spring attached to said swingable member for bias of said swingable member in two opposite directions, and a roller fixed to the shutter shaft and having, on a side face, a projection adapted to engage said movable member whenever said movable member is moved and adapted to engage said first idler whenever the position of said swingable member is shifted in one of the two opposite directions and adapted to engage said second idler whenever the position of said swingable member is urged in the other of the two directions.