Cinematographic camera

Claim 2

In a motion picture camera having a film gate device including an aperture plate, a pressure plate and a spring for urging the pressure plate toward the aperture plate to press a film against the aperture plate, the improvement comprising: film pressure operation releasing means for releasing said pressure plate when motion pictures are not being taken such that the film is pressed against the aperture plate by the pressure plate only during the taking of motion pictures, said film pressure operation releasing means comprising: a. first means acting directly on said pressure plate for pushing said pressure plate away from said aperture plate against said spring to a retracted position; and b. second means acting directly on said pressure plate for overcoming the action of said first means in response to an operation normally required for taking motion pictures wherein upon overcoming the action of the first means the pressure plate passes the film against the aperture plate.

Claim 3

In a motion picture camera having a film gate device including an aperture plate, a pressure plate and a spring for urging the pressure plate toward the aperture plate to press a film against said aperture plate, the improvement comprising: film pressure operation releasing means for releasing said pressure plate when motion pictures are not being taken such that the film is pressed against the aperture plate by the pressure plate only during the taking of motion pictures, said film pressure operation releasing means comprising: a. first means, including a first biasing spring for pushing said pressure plate away from said aperture plate, said first biasing spring normally urging said first means away from the position for pushing said pressure plate; b. second means, including a second biasing spring, for moving said first means to a position where said pressure plate is away from said aperture plate, said second biasing spring normally urging said second means for moving said first means in a manner that said pressure plate is away from said aperture plate, wherein the second biasing spring has a force sufficient to overcome the force of the first biasing spring; and c. third means for moving said second means to a position where it does not affect said first means whereby said first means moves to a position under the action of the first biasing spring such that said pressure plate pushes said film against said aperture plate, wherein said third means overcomes the force of said second biasing means, said third means operating in response to an operation normally required for taking motion pictures.

Claim 4

In a motion picture camera having a film gate device including an aperture plate, a pressure plate and a spring for urging the pressure plate toward the aperture plate to press a film against said aperture plate, the improvement comprising: film pressure operation releasing means for releasing said pressure plate when motion pictures are not being taken such that the film is pressed against the aperture plate by the pressure plate only during the taking of motion pictures, said film pressure operation releasing means comprising: a. first means, including a first biasing spring for pushing said pressure plate away from said aperture plate, said first biasing spring normally urging said first means away from the position for pushing said pressure plate; b. second means, including a second biasing spring, for moving said first means to a position where said pressure plate is away from said aperture plate, said second biasing spring normally urging said second means for moving said first means in a manner that said pressure plate is away from said aperture plate, wherein the second biasing spring has a force sufficient to overcome the force of the first biasing spring; and c. third means for moving said second means to a position where it does not affect said first means whereby said first means moves to a position under the action of the first biasing spring such that said pressure plate pushes said film against said aperture plate, wherein said third means overcomes the force of said second biasing means, said third means operating in response to an operation normally required for taking motion pictures.

Claim 5

A motion picture camera as defined in claim 2 wherein said third means is a shutter release button.

Claim 6

A motion picture camera as defined in claim 1 wherein said first means comprises a metal pin spring biased to push against the pressure plate, and said second means comprises an electromagnet to attract said metal pin, and means for energizing said electromagnet.

Claim 7

A motion picture camera as defined in claim 4 wherein said means for energizing said electromagnet comprises means actuated in response to a shutter release operation.

Claim 8

A motion picture camera as defined in claim 5 wherein said electromagnet is energized by closing a first switch provided just behind a shutter release, wherein said first switch is closed when the shutter button is operated.

Claim 9

A motion picture camera as defined in claim 6 wherein said first switch is provided in series with a second switch for energizing a film feeding means anD a sector driving means, wherein said first and second switches may be closed by pushing down the shutter button and wherein said first switch is closed prior to said second switch.

Claim 10

A motion picture camera as defined in claim 1 wherein said first means comprises a pin for pushing said pressure plate backward to a retracted position, said first means being spring biased in a direction away from the pressure plate, such that said pressure plate presses the film against the aperture plate, and said second means comprises a cam member fixed concentrically to a film feed speed changing dial, said cam having its maximum radius portion at the locking position where the dial locks the shutter button release, said pin following said cam member against the action of its spring bias.

Claim 11

A motion picture camera as defined in claim 1 wherein said first means comprises a pin spring-biased in the direction away from said pressure plate, and said second means comprises an actuation member engaged with said pin and spring biased in a direction to release said pin, said actuation member being held against its spring bias by a foldable grip of the camera which abuts said actuation member, whereby said actuation member is moved by the action of its spring bias to release said pin, when the grip is erected to a picture taking position.

Claim 12

A motion picture camera as defined in claim 9 wherein said actuation member includes an L-shaped lever for engaging said pin and for transmitting the movement of said actuation member to said pin.

Claim 13

A motion picture camera as defined in claim 1 wherein said first means comprises a pressure plate pushing pin spring biased to push the pressure plate away from the aperture plate and a lever interlocked with said pin, spring biased in a direction to allow said pin to push the pressure plate, and said second means comprises an actuation member actuated in response to operation of a push member which is pushed prior to operation for taking motion pictures, said actuation member being interlocked with said lever whereby said lever is moved to overcome the spring bias of said first means when said push member is pushed.

Claim 14

A motion picture camera as defined in claim 11 wherein said push member is a push button member projected above an eye-piece of the camera, wherein said push button is pushed inwardly by the forehead of the photographer.

Claim 15

A motion picture camera as defined in claim 11 wherein said push member is a push button switch for energizing an automatic exposure control means in the camera.