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US 3,943,534 AGranted
Safety mechanism in motor driven camera film take-up
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorAkihiro Arai
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AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorAkihiro Arai
Estimating the term…
In a camera including an electric motor for advancing the film an increment frame and for cocking and releasing the shutter an interlock mechanism is provided for preventing further motor actuation in the absence of a full frame advance. The interlock mechanism includes a pair of elements for sequentially sensing successively spaced points in the film advancing cycle and for enabling a normally disabled motor energizing network upon the successive actuation of the sensing elements. The sensing elements may be switches actuated by a cam carried by the film take-up shaft and the network, in one form, includes a pair of relays energized by the closure of respective sensing switches, each relay including a hold switch and a controlled switch, the controlled switches being series connected in a motor energizing circuit. In the mechanical counterpart the sensing elements are pawls actuated by the cam, the successive actuation of the pawls releasing an actuating member for closing a switch in series in the motor energizing circuit. Other networks and mechanisms are described.
A safety mechanism in an electric motor driven camera for stoppage of release action in the absence of the advance of a full frame of film, said safety mechanism comprising
In a camera including a shutter, a shutter release, a film take-up, and an electric motor for driving said shutter release and film take-up and for charging said shutter, a motor control mechanism comprising a current source, a selectively operable first switch, circuit means including second switch means closed in response to said take-up advancing past a pair of predetermined points and connected in series with said motor and first switch across said current source and means for opening said circuit means in response to the actuation of said shutter release, whereby the connection of said motor across said current source to actuate said shutter release by actuation of said first switch is enabled by the advancement of said film take-up a predetermined amount.
An automatic stoppage means in an electric-automatic film taking-up camera in which owing to stoppage of the take-up shaft change-over is made from a take-up circuit to a release circuit comprising a take-up and release drive motor, a current source, a shutter release control circuit including switch means connected between said motor and current source and means responsive to the advance of the film take-up through a pair of predetermined successive positions during one cycle of take-up action for closing said switch means and responsive to the change-over from the shutter release control circuit to the take-up action circuit for opening said switch, the current supply to the motor being stopped owing to opening of said switch because of the stoppage of take-up action.
Dependencies are inferred from the claim text.