Film advance and metering mechanism 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, including a member mounted on said housing for movement away from and back to a rest position, for advancing received film along said exposure plane, (4) film sensing means, movable between a retracted position on one side of said exposure plane and a position transversing said exposure plane and extending through one of the film perforations, for detecting the presence of a perforation at a predetermined position along said exposure plane, and (5) metering means, interconnecting said film sensing means and said transport means, for preventing further film advancement by said transport means when said film sensing means detects the presence of a perforation at said predetermined position; the improvement comprising means interconnecting said member and said film sensing means for returning said film sensing means to its retracted position in response to movement of said member to its rest position.

Claim 3

The improvement as defined in claim 1 further comprising spring means for urging said member toward its rest position.

Claim 4

means defining an exposure plane,

Claim 5

means defining an exposure plane,

Claim 6

a film sensing pawl movable between a retracted position on one side of said exposure plane and an extended position transversing said exposure plane and extending through one of the film perforations to detect the presence of a perforation at a predetermined position, and

Claim 7

a film sensing pawl movable between a retracted position on one side of said exposure plane and an extended position transversing said exposure plane and extending through one of the film perforations to detect the presence of a perforation at a predetermined position, and

Claim 8

The improvement as defined in Claim 2 further comprising spring means for urging said film sensing means away from its retracted position.

Claim 9

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 including a film wind member reciprocally mounted on said housing for movement away from a rest position for advancing received film along said exposure plane, (4) a metering mechanism having an active condition for preventing further Film advancement by said transport means and an inactive condition, (5) means for releasably latching said metering mechanism in its inactive condition, (6) means urging said metering mechanism into its active condition, (7) a shutter release lever movable from a first position to a second position for effecting exposure of the film at said exposure plane, and (8) means for placing said metering mechanism in its inactive condition when said shutter release lever is moved to its second position; the improvement comprising: a film sensing pawl movable between a retracted position on one side of said exposure plane and a position transversing said exposure plane and extending through one of said film perforations to detect the presence of a perforation at a predetermined position; spring means urging said sensing pawl toward its extended position; means for releasing said latching means upon movement of said sensing pawl to a predetermining location in its extended position; and means interconnecting said film wind member and said film sensing pawl for moving said pawl to its retracted position when said film wind member is moved to its rest position.

Claim 10

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 including a film wind member reciprocally mounted on said housing for movement away from a rest position for advancing received film along said exposure plane, (4) a metering mechanism having an active condition for preventing further Film advancement by said transport means and an inactive condition, (5) means for releasably latching said metering mechanism in its inactive condition, (6) means urging said metering mechanism into its active condition, (7) a shutter release lever movable from a first position to a second position for effecting exposure of the film at said exposure plane, and (8) means for placing said metering mechanism in its inactive condition when said shutter release lever is moved to its second position; the improvement comprising: a film sensing pawl movable between a retracted position on one side of said exposure plane and a position transversing said exposure plane and extending through one of said film perforations to detect the presence of a perforation at a predetermined position; spring means urging said sensing pawl toward its extended position; means for releasing said latching means upon movement of said sensing pawl to a predetermining location in its extended position; and means interconnecting said film wind member and said film sensing pawl for moving said pawl to its retracted position when said film wind member is moved to its rest position.

Claim 11

a film advance mechanism including (a) transport means operable for advancing received film along said exposure plane and (b) metering means responsive to the detection of a perforation at said predetermined position by said sensing pawl for pre-venting further film advancement by said transport means; the improvement comprising:

Claim 12

a film advance mechanism including (a) transport means operable for advancing received film along said exposure plane and (b) metering means responsive to the detection of a perforation at said predetermined position by said sensing pawl for pre-venting further film advancement by said transport means; the improvement comprising:

Claim 13

In combination with a camera''s film advancing mechanism which includes a film wind member movable toward and away from a stationary position, and means for advancing perforated film along an exposure plane when said member is moved away from said stationary position, a film metering mechanism comprising: a film sensing pawl movable (1) in first and second opposed directions between a retracted position on one side of said exposure plane and a position transversing said exposure plane and extending through a perforation in the film, and (2) in third and fourth opposed directions generally parallel to said exposure plane when said sensing pawl is in its extended position; spring means urging said sensing pawl in its third direction, said sensing pawl being movable in its fourth direction to a metering position by the trailing edge of a film perforation advancing along said exposure plane; means interconnecting said sensing pawl and said film advancing mechanism for preventing further film advancement by said film advancing mechanism when said sensing pawl is in its metering position; and means interconnecting said member and said sensing pawl for moving said sensing pawl to its retracted position in response to movement of said member to its stationary position.

Claim 14

In combination with a camera''s film advancing mechanism which includes a film wind member movable toward and away from a stationary position, and means for advancing perforated film along an exposure plane when said member is moved away from said stationary position, a film metering mechanism comprising: a film sensing pawl movable (1) in first and second opposed directions between a retracted position on one side of said exposure plane and a position transversing said exposure plane and extending through a perforation in the film, and (2) in third and fourth opposed directions generally parallel to said exposure plane when said sensing pawl is in its extended position; spring means urging said sensing pawl in its third direction, said sensing pawl being movable in its fourth direction to a metering position by the trailing edge of a film perforation advancing along said exposure plane; means interconnecting said sensing pawl and said film advancing mechanism for preventing further film advancement by said film advancing mechanism when said sensing pawl is in its metering position; and means interconnecting said member and said sensing pawl for moving said sensing pawl to its retracted position in response to movement of said member to its stationary position.

Claim 15

means operable for moving said sensing pawl to its retracted position; and

Claim 16

means operable for moving said sensing pawl to its retracted position; and

Claim 17

In a camera having

Claim 18

In a camera having

Claim 19

means responsive, after the sensing of a film perforation at said predetermined position by said sensing pawl, to a film advance terminating movement of said film advance mechanism for moving said sensing pawl to its retracted position.

Claim 20

means responsive, after the sensing of a film perforation at said predetermined position by said sensing pawl, to a film advance terminating movement of said film advance mechanism for moving said sensing pawl to its retracted position.