Auto-metering system

An auto-metering system for use in a camera having a film advance system for advancing film in a winding direction and a film rewind system for advancing film in a rewind direction, the auto-metering system comprising:

• a sprocket wheel having a support member arranged in contact with the film so that when the film advance drive system advances the film, the sprocket wheel is rotated, with the sprocket wheel having a gear engagement surface;
• a reduction gear engaging the gear engagement surface of the sprocket wheel, the reduction gear having a lobe thereon, with the reduction gear and lobe arranged to move the lobe between a first position and a second position with said movement between the first position and second position occurring at a different rate than the rate of rotation of the sprocket wheel;
• a metering switch located at the second position and changing between a first state when the cam is not at the second position and a second state when the cam is at second position;
• and
• a control circuit that activates the film advance drive system after an image is captured and deactivates the film advance drive system in response to a change in state of the metering switch;
• wherein the sprocket wheel, reduction gear and lobe, are arranged so the lobe is at the second position when the film is advanced by a predetermined amount.

An auto-metering system for a film camera having a film advance system, the auto-metering system comprising:

• a sprocket wheel having a support member arranged in contact with the film so that when the film advance system advances the film, the sprocket wheel is rotated, with the sprocket wheel having a gear engagement surface;
• a reduction gear engaging the gear engagement surface of the sprocket wheel, the reduction gear having a lobe thereon, with the reduction gear and lobe arranged to move the lobe between a first position and a second position with said movement between the first position and second position occurring at a different rate than the rate of rotation of the sprocket wheel;
• a power supply for supplying energy;
• a metering switch located at the second position and changeable between a first state when the cam is not at the second position and a second state when the cam is at the second position said metering switch electrically connected in series between the power supply and the film advance system said metering switch providing energy from the power supply to film advance system causing the film advance system to advance the film when the metering switch is at the first position and to interrupt the flow of energy to the film advance system when the metering switch is at the second position;
• and
• a film advance jog circuit for temporarily providing power to the film advance system when the metering switch is in the second position so as to move the metering switch from the second position to the first position;
• wherein the sprocket wheel, reduction gear and lobe, are arranged so the lobe is at the second position when the film is advanced by a predetermined amount.

An auto-metering system for a film camera having a film advance drive system, the auto-metering system comprising:

• a film movement follower having a film contact surface and adapted to in concert with advancement of the film by the film advance drive system;
• a metering switch adjustable between a first position associated with a first state and a second position associated with a second state;
• a transmission system having a first surface for engaging the film movement follower and a second surface said conversion system adapted to receive energy from the film movement follower and to adjust the second surface to drive the metering switch from the first state to the second state when a predetermined amount of energy is received from the film movement follower;
• and
• a control circuit connected to metering switch for detecting a change in state of the metering switch and for generating a signal disabling film advance system in response to a detected change in state of the metering switch,
• wherein the film movement follower moves through more than once cycle of movement as the predetermined amount of energy is received from film movement, and wherein the transmission converts the more than one cycle of movement of the follower into one cycle of movement the second surface.