Device for preventing film movement in cameras

Claim 2

In a camera having (1) supply and take-up chambers for receiving respectively supply and take-up rolls of a filmstrip perforated at predetermined metering intervals; (2) transport means operable to advance a received filmstrip along a camera exposure plane from said supply chamber to said take-up chamber, (3) an exposure mechanism operable to effect the exposure of received filmstrip at the exposure plane; (4) a metering mechanism having an active condition disabling said transport means and an inactive condition, (5) a film sensing member movable from a retracted position on one side of said exposure plane to an extended position transversing said exposure plane when intercepting one of the perforations of a received filmstrip, and, by the trailing edge of the perforation as the received filmstrip is advanced, to a metering position spaced from said extended position in the general direction of filmstrip advancement; (6) means associated with said sensing member and said metering mechanism for placing said metering mechanism in its active condition upon movement of said sensing member to its metering position; and (7) means for applying a force to said sensing member, said force having a direction urging said sensing member from its metering position toward its extended position; the improvement comprising means associated with said force applying means for selectively removing said force from said sensing member at least during operation of said exposure mechanism, whereby such force is not transmitted by said sensing member to a received filmstrip during exposure.

Claim 3

In a camera having (1) supply and take-up chambers for receiving respectively supply and take-up rolls of a filmstrip perforated at predetermined metering intervals; (2) transport means operable to advance a received filmstrip along a camera exposure from said supply chamber to said take-up chamber; (3) an exposure mechanism operable to effect the exposure of received filmstrip at the exposUre plane; (4) a metering mechanism having an active condition disabling said transport means and an inactive condition, (5) a film sensing member movable from a retracted position on one side of said exposure plane to an extended position transversing said exposure plane when intercepting one of the perforations of a received filmstrip, and, by the trailing edge of the perforation as the received filmstrip is advanced, to a metering position spaced from said extended position in the general direction of filmstrip advancement; and (6) means associated with said sensing member and said metering mechanism for placing said metering mechanism in its active condition upon movement of said sensing member to its metering position; the improvement comprising: means, including a control member movable toward and away from a predetermined position, for moving said sensing member in a direction along the exposure plane opposed to the direction of film advancement only when said control member is moved away from its predetermined position; and means for locating said control member at its predetermined position at least during operation of said exposure mechanism.

Claim 4

In a camera having (1) supply and take-up chambers for receiving respectively supply and take-up rolls of a filmstrip perforated at predetermined metering intervals; (2) transport means operable to advance a received filmstrip along a camera exposure from said supply chamber to said take-up chamber; (3) an exposure mechanism operable to effect the exposure of received filmstrip at the exposUre plane; (4) a metering mechanism having an active condition disabling said transport means and an inactive condition, (5) a film sensing member movable from a retracted position on one side of said exposure plane to an extended position transversing said exposure plane when intercepting one of the perforations of a received filmstrip, and, by the trailing edge of the perforation as the received filmstrip is advanced, to a metering position spaced from said extended position in the general direction of filmstrip advancement; and (6) means associated with said sensing member and said metering mechanism for placing said metering mechanism in its active condition upon movement of said sensing member to its metering position; the improvement comprising: means, including a control member movable toward and away from a predetermined position, for moving said sensing member in a direction along the exposure plane opposed to the direction of film advancement only when said control member is moved away from its predetermined position; and means for locating said control member at its predetermined position at least during operation of said exposure mechanism.

Claim 5

The improvement as defined in claim 2 further comprising means associated with said sensing member and said control member for moving said sensing member from its metering position to its retracted position upon movement of said control member from its predetermined position.

Claim 6

The improvement as defined in claim 3 wherein said last-mentioned means includes a cam surface on said sensing member contactable by said control member.

Claim 7

The improvement as defined in claim 2 further comprising means associated with said control member and said transport means for moving said control member from its predetermined position upon intial operation of said transport means.

Claim 8

The improvement as defined in claim 2 further comprising spring means for urging said sensing member from its retracted position toward its extended position.

Claim 9

In a camera having (1) supply and take-up chambers for receiving respectively supply and take-up rolls of filmstrip perforated at predetermined metering intervals; (2) transport means operable to advance a received filmstrip along a camera exposure plane from said supply chamber to said take-up chamber; (3) a shutter mechanism movable from a cocked position to a run-down position to effect the exposure of received filmstrip at the exposure plane; (4) cocking means operable to move said shutter mechanism to its cocked position; (5) a metering mechanism having an active condition disabling said transport means and an inactive condition; (6) a film sensing member movable from a retracted position on one side of said exposure plane to an extended position transversing said exposure plane when intercepting one of the perforations of a received filmstrip, and, by the trailing edge of the perforation as the received filmstrip is advanced, to a metering position spaced from said extended position in the general direction of filmstrip advancement; and (7) means associated with said sensing member and said metering mechanism for placing said metering mechanism in its active condition upon movement of said sensing member to its metering position; the improvement comprising: a control member movable toward and away from a predetermined position; spring means associated with said control member in a manner to be operatively coupled to said sensing member for urging said sensing member in a direction along the exposure plane opposed to the direction of film advancement when said control member is moved away from its predetermined position and to be uncoupled from said sensing member when said control member is in its predetermined position; means for moving said control member to its predetermined position at least during run-down movement of said shutter mechanism; and means associated with said cocking means for moving Said control member from its determined position upon operation of said cocking means.

Claim 10

In a camera having (1) supply and take-up chambers for receiving respectively supply and take-up rolls of filmstrip perforated at predetermined metering intervals; (2) transport means operable to advance a received filmstrip along a camera exposure plane from said supply chamber to said take-up chamber; (3) a shutter mechanism movable from a cocked position to a run-down position to effect the exposure of received filmstrip at the exposure plane; (4) cocking means operable to move said shutter mechanism to its cocked position; (5) a metering mechanism having an active condition disabling said transport means and an inactive condition; (6) a film sensing member movable from a retracted position on one side of said exposure plane to an extended position transversing said exposure plane when intercepting one of the perforations of a received filmstrip, and, by the trailing edge of the perforation as the received filmstrip is advanced, to a metering position spaced from said extended position in the general direction of filmstrip advancement; and (7) means associated with said sensing member and said metering mechanism for placing said metering mechanism in its active condition upon movement of said sensing member to its metering position; the improvement comprising: a control member movable toward and away from a predetermined position; spring means associated with said control member in a manner to be operatively coupled to said sensing member for urging said sensing member in a direction along the exposure plane opposed to the direction of film advancement when said control member is moved away from its predetermined position and to be uncoupled from said sensing member when said control member is in its predetermined position; means for moving said control member to its predetermined position at least during run-down movement of said shutter mechanism; and means associated with said cocking means for moving Said control member from its determined position upon operation of said cocking means.