Abstract: A motor driven rewind device for a camera operating in such a manner that an actuation of a rewind control member initiates an energization of an electric motor, and driving torque of this motor brings a rewind shaft into operative connection with a spool shaft of the film patrone so that a film rewinding operation is initiated, wherein the rewind control member is made lockable in each operative position, and a compressed spring is provided between a rewind coupler engaging the aforesaid spool shaft and the aforesaid rewind shaft receptive of the driving torque of the motor to exert an absorbing action in the rotative and axial directions of said coupler, whereby the film rewind control is made more reliable.

Abstract: A camera mechanism is stopped from further movement at an adjusted position by an arresting member. The operation of the arresting member is controlled as a control member therefor is driven by an electromagnetic drive source. When the mechanism is rendered inoperative, the arresting member is held stationary by a prohibiting member. At the same time when an operation of the mechanism is initiated by an actuating member, motion of the actuating member also serves to take the prohibiting member out of connection with the arresting member. Then, upon driving the control member to move, the operation of the mechanism is terminated by the arresting member.

Abstract: In the disclosed camera and power winder arrangement, a power winder winds the film and contains a rewinder. A detector responds to rewinding movement of the film past a predetermined position, and a control circuit responds to the detector's sensing that the film has stopped moving past the predetermined position by braking the film rewind source.

Abstract: A film advance error detection system for synchronizing the operation of shutter cocking and film winding mechanisms with a motor drive unit therefor. This system utilizes three transducers positioned adjacent the sprocket wheel, film perforations and rewinding spindle to pick up signals whose frequencies are related to their speeds. By processing the signals in combination with an output signal of a phase difference compensator, it is made possible to provide, in a selective manner, a display representative of the film advane error and reeling end in the winding and rewinding operations along with the automatic stoppage of rotation of the motor.

Abstract: In the system disclosed, a motor drives a winding arrangement and a rewinding arrangement for advancing and rewinding the film in a camera in response to a first switch device that forms an electrical signal indicating completion of an exposure in the camera and a second switch device that indicates that the film has been rewound; the first and second switch devices being electrically connected to each other. The exposure completion and advance completion signals in the winding mode, and rewind stop completion signals in the rewind mode are multiplexed along the same line between the camera and the unit.

Abstract: In the disclosed device, forward and reverse rotation of a motor is used to wind and rewind a camera. A first semi-conductor switching element becomes conductive during winding and a second semi-conductor switching element becomes conductive during rewinding, the switching elements being connected in series across a power source. A selector switch has its fixed terminals connected to opposite poles of the power source. The motor is connected between the armature of the selector switch and the point between the switching elements. Driving circuits operate the switches so that the motor is driven in one direction when the selector switch is in one position and the reverse direction when the selector switch is in the other position and arranged to brake the motor after rewinding has stopped.

Abstract: A motor drive unit for a camera having variable winding speed characteristics functions so as to operate in a manner suited to environmental conditions such as temperature. This is done by changing the gear ratio from the motor to one of two values near the point of maximum efficiency and the point of maximum power output of the characteristic curve of the motors. Timer-controlled change of film frequency variation for providing a combined effect with the gear ratio is also disclosed.

Abstract: The disclosed device winds film in a continuous rapid-sequence mode or a non-continuous single-frame mode. A disengagement arrangement responds to a winding completion signal after each frame is wound in the continuous mode and disengages the transmission during the subsequent shutter release, but allows the transmission to remain engaged in the non-continuous mode and at the end of a winding sequence in the continuous mode. According to one embodiment, the disengagement arrangement contains an electromagnet that also actuates the camera's shutter release in the continuous mode.

Abstract: In the disclosed camera, a manually operated film advance lever and a shutter button are arranged conveniently to be operated when the camera is held for a horizontal shot, i.e., an exposure during which the film frame is oriented horizontally. A coupling arrangement, in an adapter suitable for mounting on the camera, engages a camera film winder and shutter release and contains a second winding lever and a second shutter release button both oriented in a position suitable for taking a vertical shot.