Apparatus for controlling film advancement in a camera

An apparatus for controlling film advancement in a camera of the type that has driving means, including an electrical motor, for driving a take-up spool to wind film thereon from a supply spool for film take-up and for alternatively driving the supply spool to rewind film, and which has change-over switch means having a first state for supplying current in one direction to the electrical motor to drive the motor in a forward direction for film take-up and having a second state for supplying current in the opposite direction to the electrical motor to drive the motor in a reverse direction for film rewind, the apparatus comprising:

• a displacement member for controlling the state of the change-over switch means, the displacement member having a first position at which it disposes the change-over switch means in the first state and having a second position at which the change-over switch means is in the second state;
• means for controlling the position of the displacement member, the controlling means including first and second members, each having first and second operating positions, and first and second biasing means for respectively biasing the first and second members to the first operating position, the first and second members being operable to hold the displacement member in its first position upon at least one of the first and second members being in the first operating position and being operable to permit movement of the displacement member to its secomd position only upon both the first and second members being in the second operating position, the first member being disposed in the second operating position when film is wound upon the take-up spool, and the second member being disposed in the second operating position in response to the initiation of film rewind;
• and
• means operable upon initiation of film rewind for releasably holding the second member in the second operating position until initiation of subsequent film take-up.