US 4,281,911 AGranted

Motorized film-transporting mechanism

AssigneeAgfa-Gevaert

InventorsDieter Engelsmann, Reinhard Nicko, Leo Lippl, Dieter Maas

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Abstract

A motorized film-transporting mechanism for roll film cameras has a motor-circuit switch arranged in the path of movement of a film sensor so as to be closed when a film is present in the camera. A film counter is biased to zero position when the camera back is opened. When a film is present in the camera and the back is closed, the motor is automatically energized to advance the film by a length corresponding to two film frames so as to move this usually spoiled (light-blackened) film length out of the way. The motor is then automatically de-energized and all components are in readiness for subsequent picture-taking and incremental film advance by one film frame each. When all exposures have been made the film is rewound by the motor which shuts down when rewinding is completed.

Claims6

Dependent claims

In a roll film camera having a housing with a back wall movable between open and closed positions, a film-transporting and shutter-cocking arrangement comprising a film counter having a projection and being movable to counting position in response to closing of the back wall and to zero position in response to opening of the back wall;

switch means operative for controlling the supply of electrical energy to a camera motor and being movable to closed position in response to insertion of film into the camera and to open position in response to the absence of film in the camera;
a control lever having an arm engaging said projection when said film counter is in the zero position and becoming disengaged therefrom in response to repeated stepwise operation of the film counter;
a switch in series with said switch means and being closed when said back wall is closed;
and a blocking lever engaged by said control lever when said arm engages said projection and becoming released from said control lever when said arm disengages from said projection, so that said blocking lever can cooperate with a film metering means upon transportation of the film by the length of a film frame resulting in deenergization of the motor.

1 more element

Dependencies are inferred from the claim text.