Film creep preventing means for cameras

Claim 2

In a camera having (1) a housing including a space for receiving roll film perforated at predetermined metering intervals, (2) means defining an exposure plane, (3) transport means operable for adVancing film along said exposure plane, and (4) a metering mechanism having an active condition disabling said transport means and an inactive condition, the improvement comprising: a brake member movable between an active position contacting received film to prevent film movement along said exposure plane and an inactive position; and means for moving said brake member to its inactive position when said metering mechanism is in its inactive condition and for moving said brake member to its active position when said metering mechanism is in its active condition, whereby said brake member is effective to prevent film movement when said transport means is disabled.

Claim 3

The improvement as defined in claim 1 wherein: said metering mechanism comprises a film sensing pawl having a first condition when said metering mechanism is in its active condition and a second condition when said metering mechanism is in its inactive condition; said means for moving said brake member includes (1) spring means urging said brake member toward its active position and (2) abutment means, contactable by said sensing pawl in its second condition to move said brake member to its inactive position.

Claim 4

The improvement as defined in claim 2 further comprising: means mounting said sensing pawl on said housing for rotational movement; and means constraining said sensing pawl to a first angular position in its first condition and to a second angular position in its second condition.

Claim 5

The improvement as defined in claim 1 wherein: said metering mechanism comprises a film sensing pawl (1) rotatable between first and second angular positions and (2) movable between a retracted position on one side of said exposure plane and an extended position transversing said exposure plane through one of the film perforations, said sensing pawl assuming its first angular position when said metering mechanism is in its active condition and its second angular position when said metering mechanism is in its inactive condition; and said means for moving said brake member includes (1) spring means for urging said brake member toward its active position and (2) abutment means, contactable by said sensing pawl in its second angular position to move said brake member to its inactive position.

Claim 6

In a camera having (1) a housing including a space for receiving perforated roll film, (2) means defining an exposure plane, (3) transport means operable for advancing received film along said exposure plane, (4) a film sensing pawl adapted to enter a film perforation to detect the presence of a perforation at a predetermined position along the exposure plane, (5) means associated with said transport means and said sensing pawl for disabling said transport means upon detection of a perforation at said predetermined position and (6) exposure means, operable after said transport means has been disabled, for effecting exposure of the film; the improvement comprising: means for withdrawing said sensing pawl from a perforation after said transport means has been disabled and before operation of said exposure means; a brake member movable between an active position contacting received film to prevent film movement along said exposure plane and an inactive position; and means (1) for moving said brake member to its inactive position during operation of said transport means and (2) for moving said brake member to its active position when said transport means is not being operated to advance film.

Claim 7

In a camera having (1) a housing including a space for receiving perforated roll film, (2) means defining an exposure plane, (3) transport means operable for advancing received film along said exposure plane, (4) a film sensing pawl adapted to enter a film perforation to detect the presence of a perforation at a predetermined position along the exposure plane, (5) means associated with said transport means and said sensing pawl for disabling said transport means upon detection of a perforation at said predetermined position and (6) exposure means, operable after said transport means has been disabled, for effecting exposure of the film; the improvement comprising: means for withdrawing said sensing pawl from a perforation after said transport means has been disabled and before operation of said exposure means; a brake member movable between an active position contacting received film to prevent film movement along said exposure plane and an inactive position; and means (1) for moving said brake member to its inactive position during operation of said transport means and (2) for moving said brake member to its active position when said transport means is not being operated to advance film.

Claim 8

The improvement as defined in claim 5 wherein said moving means comprises: spring means urging said brake member toward its active position, and means interconnecting said brake member and said transport means for moving said brake member to its inactive position during operation of said transport means.

Claim 9

The improvement as defined in claim 5 wherein said moving means comprises: spring means urging said brake member toward its inactive position; and means interconnecting said brake member and said transport means for moving said brake member to its active position when said transport means is not being operated.

Claim 10

A camera of the type adapted to receive roll film perforated at predetermined metering intervals and having (1) transport means for advancing received film along the camera''s exposure plane, (2) a metering mechanism operable for disabling said transport means, (3) exposure means operable for effecting exposure of film at said exposure plane, (4) a film sensing pawl movable between a retracted position on one side of said exposure plane and an extended position traversing said exposure plane through one of the film perforations to detect the presence of a perforation at a predetermined position and (5) means associated with said sensing pawl and said metering mechanism for operating said metering mechanism to disable said transport means when said sensing pawl is in its extended position and detects the presence of a perforation at said predetermined position; said camera comprising: means associated with said sensing pawl and said transport means for moving said sensing pawl to its retracted position except during operation of said transport means; a brake member movable between an inactive position and an active position contacting received film to prevent film movement along said exposure plane; and means for locating said brake member in its active position at least during the interval between (1) operation of said metering mechanism to disable said transport means and (2) operation of said exposure effecting means.

Claim 11

A camera of the type adapted to receive roll film perforated at predetermined metering intervals and having (1) transport means for advancing received film along the camera''s exposure plane, (2) a metering mechanism operable for disabling said transport means, (3) exposure means operable for effecting exposure of film at said exposure plane, (4) a film sensing pawl movable between a retracted position on one side of said exposure plane and an extended position traversing said exposure plane through one of the film perforations to detect the presence of a perforation at a predetermined position and (5) means associated with said sensing pawl and said metering mechanism for operating said metering mechanism to disable said transport means when said sensing pawl is in its extended position and detects the presence of a perforation at said predetermined position; said camera comprising: means associated with said sensing pawl and said transport means for moving said sensing pawl to its retracted position except during operation of said transport means; a brake member movable between an inactive position and an active position contacting received film to prevent film movement along said exposure plane; and means for locating said brake member in its active position at least during the interval between (1) operation of said metering mechanism to disable said transport means and (2) operation of said exposure effecting means.

Claim 12

A camera as defined in claim 8 wherein said locating means comprises: spring means for urging said brake member toward its active position; and means associated with said brake member and said sensing pawl for moving said brake member to its inactive position upon operation of said exposure means.

Claim 13

A camera as defined in claim 8 wherein said locating means comprises: spring means for urging said brake member toward its inactive position; and means associated with said brake member and said transport means for moving said brake member to its active position when said transport means is not being operated.

Claim 14

A camera as defined in claim 8 wherein said locating means comprises: spring means for urging said brake member toward its active position; and means associated with said brake member and said transport means for moving said brake member to its inactive position upon operation of said transport means.