Camera with metered film advance and double exposure prevention

Claim 2

A camera adapted to accommodate an elongated strip of photographic film provided with metering perforations at predetermined intervals therealong, said camera comprising: a film advancing device movable to advance the strip of photographic film longitudinally past a predetermined exposure location, a metering member including a metering tooth adapted to enter a metering perforation in the film and to move therewith in the direction of film advance under urging of the film to move said metering member from an inoperative position to aN operative position, means for disabling said film advancing device in response to the presence of said metering member at said operative position, means for resiliently urging said metering member toward said inoperative position, a trigger member movable manually from a first position to a second position while said metering member is in said operative position to withdraw said metering tooth from the film perforation in which it is received to permit movement of said metering member from said operative position to said inoperative position by said urging means, a shutter operable to effect exposure of an area of the strip of photographic film located at said predetermined exposure location, means for operating said shutter, and means for actuating said shutter operating means in response to movement of said metering member from said operative position toward said inoperative position by said urging means.

Claim 3

A camera according to claim 1 including: means for biasing said trigger member from said second position toward said first position, means releasably engageable with said trigger member upon movement of said trigger member to said second position for releasably retaining said trigger member in said second position in opposition to said biasing means, and means for disengaging said trigger retaining means from said trigger member in response to movement of said metering member from said inoperative position to said operative position.

Claim 4

In a camera adapted to be loaded with an elongated strip of film provided with metering perforations at predetermined intervals therealong, said camera including: a film winding member rotatable to move the strip of film longitudinally past a predetermined exposure location, a movable metering member including a metering tooth adapted to enter one of the perforations in the strip of film to translate movement of the strip of film by said winding member into corresponding movement of said metering member from an inoperative position to an operative position, means engageable with said metering member for resiliently urging said metering tooth toward the strip of film and for resiliently urging said metering member toward said inoperative position, a pawl member engageable with said film winding member in response to movement of said metering member to said operative position to block rotation of said film winding member as long as said metering member is in said operative position, a lens, a shutter mechanism operable to effect exposure of an area of the strip of film located at said predetermined exposure location in optical alignment with said lens, a trigger member manually movable from an extended position to a depressed position, and means for resiliently urging said trigger member from said depressed position toward said extended position, the improvement comprising: means for translating movement of said trigger member from said extended position to said depressed position into withdrawal of said metering tooth from the metering perforation in which it is received in the strip of film, to permit movement of said metering member by said metering member urging means from said operative position to said inoperative position to disengage said pawl member from said winding member, and means for operating said shutter mechanism in response to the movement of said metering member by said metering member urging means from said operative toward said inoperative position.

Claim 5

In a camera adapted to be loaded with an elongated strip of film provided with metering perforations at predetermined intervals therealong, said camera including: a film winding member rotatable to move the strip of film longitudinally past a predetermined exposure location, a movable metering member including a metering tooth adapted to enter one of the perforations in the strip of film to translate movement of the strip of film by said winding member into corresponding movement of said metering member from an inoperative position to an operative position, means engageable with said metering member for resiliently urging said metering tooth toward the strip of film and for resiliently urging said metering member toward said inoperative position, a pawl member engageable with said film winding member in response to movement of said metering member to said operative position to block rotation of said film winding member as long as said metering member is in said operative position, a lens, a shutter mechanism operable to effect exposure of an area of the strip of film located at said predetermined exposure location in optical alignment with said lens, a trigger member manually movable from an extended position to a depressed position, and means for resiliently urging said trigger member from said depressed position toward said extended position, the improvement comprising: means for translating movement of said trigger member from said extended position to said depressed position into withdrawal of said metering tooth from the metering perforation in which it is received in the strip of film, to permit movement of said metering member by said metering member urging means from said operative position to said inoperative position to disengage said pawl member from said winding member, and means for operating said shutter mechanism in response to the movement of said metering member by said metering member urging means from said operative toward said inoperative position.

Claim 6

A camera according to claim 3 including a control member pivotally movable by said metering member to first and second locations corresponding respectively to said inoperative and operative positions of said metering member, said control member being adapted upon movement to said first location to engage said trigger member in said depressed position and to retain said trigger member in said depressed position in opposition to said trigger member urging means uNtil said control member is disengaged from said trigger member by subsequent movement of said control member to said second location.

Claim 7

A camera according to claim 4 in which said shutter operating means includes: a shutter drive member movable from a first position to a second position to operate said shutter, means defined by said control member and engageable with said shutter drive member when said control member is at said second location for blocking movement of said shutter drive member from said first position to said second position, said blocking means being disengaged from said shutter drive member upon movement of said control member to said first location, and means for resiliently biasing said shutter drive member toward said second position in response to movement of said trigger member from said extended position to said depressed position while said shutter drive member is blocked against movement from said first position to said second position, whereby said biasing means effects shutter operating movement of said shutter drive member from said first position to said second position in response to movement of said control member from said second location to said first location by said metering member.

Claim 8

A camera according to claim 5 including shutter resetting means for moving said shutter drive member from said second position to said first position in response to movement of said trigger member from said depressed position to said extended position by said resilient means.