Film feeding system of a camera

Abstract

A film advancing system of a camera in which a roll of film inside a film cartridge is first wound to a spool and then the film is rewound into the cartridge one frame from another after each photographic operation is provided. The system includes a reversibly rotatable motor the drivement and rotational direction of which are automatically controlled depending upon various conditions of the camera to implement required advancement of the film.

What is claimed is: .[.1. A film feeding system of a camera of the type in which a roll of film inside a film cartridge is first completely wound to a spool of the camera to perform a preliminary winding operation and then the film is rewound into said cartridge one frame after another upon each exposure, said system comprising: 
     
        frame of said film has been used..]. .Iadd.17.  In a camera in which film is continuously wound onto a spool from a film magazine loaded into the camera, and the film is rewound into the magazine frame by frame during its exposure, said camera being operable with a direct power supply and comprising: a motor to drive either the spool or the magazine shaft depending on the direction of the power supply;   control means for retaining the motor in a state in which power is supplied thereto continuously for rewinding the film into the magazine when no film frames allowing exposure are left;   wherein the control means includes switching means closed to effect the power supply to the motor when the direction of power supply to the motor is for driving the magazine shaft, and a switch drum for closing the switching means when no film frames are allowing exposures are left, said camera further comprising:   a sprocket,   a counter associated with the switch drum for indicating a number of film frames, said counter being biased for returning to its initial position,   transmitting means for transmitting rotation of the sprocket to the switch drum and the counter, and   detection means for detecting loading of the magazine and placing the   
     
     
        transmitting means in a non-transmitting state. .Iaddend. .Iadd.18.  A camera, wherein film is continuously wound onto a spool from a film magazine loaded into the camera, and exposures are made as the film is rewound into the magazine frame by frame, said magazine having a shaft; said camera being operable by a directional power supply and comprising: a motor for driving one of the spool and the shaft of the magazine depending on the direction of the power supply, and   change over means to detect completion of the take up of the film by the spool and for changing the direction of the power supply to the motor from a spool driving direction to a direction for driving the magazine shaft. .Iaddend. .Iadd.19. A camera according to claim 18, wherein the motor is arranged to apply a torque to the spool and the change over means is arranged for detecting variation in the torque applied to the spool for controlling the direction of the power supply to the motor..Iaddend.