Gear drive for a camera and film cartridge

Claim 2

Photographic device comprising: a film cartridge; a camera adapted to receive said cartridge and having a focal plane; a film takeup core in said cartridge; a first gear on said cartridge and drivingly connected to said core; a second gear mounted in said camera for engagement with said first gear of a received cartridge to drive said first gear and to thereby define a pressure angle therewith, the axes of said first and second gears defining a plane which is offset from a normal to the focal plane by an angle substantially equal to the pressure angle of said gears such that the line of force created in response to driving engagement of said first and second gears is substantially parallel to the focal plane; and a support in said camera for contacting said cartridge at a position along the line of force to oppose movement of said cartridge by said force.

Claim 3

For use with a camera having a gear drive mechanism for advancing film loaded in the camera, the gear drive mechanism including a gear having an axis of rotation; a film cartridge comprising: means for supporting film in a plane for exposure; a film takeup chamber; a core rotatably mounted in said takeup chamber; a gear mounted on said core for rotation about an axis, said core gear being drivingly engageable by the camera gear when said cartridge is received in the camera to define a pressure angle, said gears being so oriented when engaged that their axes of rotation define a plane rotated from a normal to the film plane by an angle substantially equal to said pressure angle; and an abutment engagEable by the camera at a position in a plane including the place of engagement of the camera gear and said core gear and parallel with the film plane.

Claim 4

For use with a camera having a gear drive mechanism for advancing film loaded in the camera, the gear drive mechanism including a gear having an axis of rotation; a film cartridge comprising: means for supporting film in a plane for exposure; a film takeup chamber; a core rotatably mounted in said takeup chamber; a gear mounted on said core for rotation about an axis, said core gear being drivingly engageable by the camera gear when said cartridge is received in the camera to define a pressure angle, said gears being so oriented when engaged that their axes of rotation define a plane rotated from a normal to the film plane by an angle substantially equal to said pressure angle; and an abutment engagEable by the camera at a position in a plane including the place of engagement of the camera gear and said core gear and parallel with the film plane.

Claim 5

For use with a film cartridge having means for supporting film in a plane for exposure, a film takeup compartment, a core rotatably mounted in the takeup compartment, and a gear mounted on the core and having an axis of rotation, a camera comprising: means for receiving the film cartridge; a gear oriented in said camera for engaging the gear of a received cartridge to drive the cartridge gear and thereby (1) to define a pressure angle and (2) to rotate the cartridge core to effect the advancement of film into the takeup compartment, said camera gear having an axis of rotation which defines with the axis of the gear of a received cartridge a plane rotated from a normal to the film plane by an angle substantially equal to said pressure angle, creating a line of force parallel to the film plane in response to driving engagement of said gears; and means for engaging a received cartridge at a place along a plane parallel to the film plane and in which the line of force lies when said gears are engaged to obviate the creation of a force moment responsive to such engagement.

Claim 6

For use with a film cartridge having means for supporting film in a plane for exposure, a film takeup compartment, a core rotatably mounted in the takeup compartment, and a gear mounted on the core and having an axis of rotation, a camera comprising: means for receiving the film cartridge; a gear oriented in said camera for engaging the gear of a received cartridge to drive the cartridge gear and thereby (1) to define a pressure angle and (2) to rotate the cartridge core to effect the advancement of film into the takeup compartment, said camera gear having an axis of rotation which defines with the axis of the gear of a received cartridge a plane rotated from a normal to the film plane by an angle substantially equal to said pressure angle, creating a line of force parallel to the film plane in response to driving engagement of said gears; and means for engaging a received cartridge at a place along a plane parallel to the film plane and in which the line of force lies when said gears are engaged to obviate the creation of a force moment responsive to such engagement.