Film frame counting devices for still cameras
AssigneeNippon Kogaku K.K.
InventorsShuji Kimura, Kouichi Daitoku
Life of this patent
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Abstract
A counting device in a still camera for indicating the exact number of frames of long-footage film exposed during regular photography includes a numerical counter and a drive gear rotatable in response to film movement for increasing the count in the counter by one for each frame of film advance, the drive gear being effective to change the count only after advance of the leader portion of the film. A cam which is incrementally rotated by an escapement mechanism in response to each frame of film advance moves a release lever to a first position for preventing counting during advancement of the leader portion of the film and thereafter to a second position for permitting counting.
Claims12
A film frame counting device in a camera for indicating the number of film frames exposed during regular photography, the device comprising:
- a numerical counter;
- count-changing means for changing the count in the counter each time the film is advanced a predetermined amount;
- a release member movable between a first position for preventing changing of the count in said counter and a second position for permitting changing of the count;
- a cam;
- and
- means for rotating the cam in response to advancement of film in said camera;
- the cam having means cooperable with the release member for holding the release member in said first position during a predetermined amount of rotation of the cam corresponding to advancement of leader portion of the film and for moving the release member from said first position to said second position upon completion of said predetermined amount of rotation.
Dependencies are inferred from the claim text.