Camera and power drive with automatic rewind brake
AssigneeCanon Kabushiki Kaisha
InventorsHidehiko Fukahori, Tomonori Iwashita, Yukio Mashimo
Life of this patent
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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.
Claims18
For a camera having:
- film transport means for transporting film and including measuring feed means for engaging the film and feeding the film along a transport path a predetermined distance at successive winding movements and film winding means for winding the film;
- release means for permitting a rewind operation and allowing said feed means to move freely, said release means including a movable member movable in association with said feed means;
- an automatic film moving device, comprising:
- (a) a drive source;
- (b) film rewinding means operatively connected to said drive source for applying a rewinding force to the film;
- (c) detecting means for engaging said movable member and detecting movement of the movable member by the film when the film is rewound, said detecting means being arranged to detect that said movable member has stopped when the film moves to disengage from said feed means;
- (d) a control circuit functionally connected to said detecting means and the drive source for controlling said drive source and automatically stopping the drive source when the film is retracted from the predetermined position in the film running path.
A film automatic drive device for use with a camera having a chamber in which film is loaded and film convoluting means within the chamber including:
- (a) a drive source;
- (b) a rewind device drivingly connectable to said drive source, said device having:
- (1) engaging means engageable with said convoluting means;
- and
- (2) displacing means operatively connected to said engaging means to displace said engaging means toward engagement with said convoluting means, said displacing means being couplable to the drive source so that the drive torque from said drive source may be transmitted to said displacing means;
- said displacing means comprising securing means for retaining the engaged condition of said engaging means with said convoluting means throughout the entire time of rewinding the film;
- said engaging means being rotatable in a rewind direction by said displaceable means and simultaneously displaceable in the engagement direction to engage said convoluting means for rewinding the film.
An automatic drive device for use in a camera having a chamber in which film is loaded, means for convoluting the film within the chamber, winding means for winding the film a predetermined amount, and actuable means operable from without the camera and operatively coupled with said winding means for permitting rewinding of the film and for rotation while the film is rewound, comprising:
- (A) an electric motor;
- (B) a rewind mechanism drivingly connectable to said electric motor, and having:
- (a) engaging means engageable with a portion of said convoluting means;
- (b) displacing means for displacing said engaging means in a direction for engagement, said displacing means being limited in its displacing movement by engagement;
- and
- (c) rewind mode selector means, for producing a connection between said motor and rewind mechanism when in the rewind mode;
- (C) a control device for said motor having:
- (d) detecting means having an engageable member which is engageable with said means operable from outside the camera for detecting the rewinding movement of the film through said actuable means;
- and
- (e) a control circuit connected to said detecting means for controlling stoppage of rotation of said motor, said circuit causing the motor to be rotated or stopped depending upon whether or not the detecting means detects movement of the film, said control circuit having a motion allowing circuit, said circuit when in the rewind mode causing forcible rotation of the motor, and engagement of said engaging means responding to operation of said displacing means.
An automatic film drive device for use with a camera having a chamber in which film is loaded and film convoluting means within the chamber, comprising:
- (a) drive source means;
- (b) a rewind device drivingly connectable to said drive source means, said device having:
- (1) engaging means displaceable relative to the convoluting means for engagement with said convoluting means;
- (2) displacing means operatively connected to said engaging means to displace and rotate said engaging means into the film rewinding direction during its engagement movement toward said convoluting means, said displacing means having rotatable means couplable to the drive source, and said engaging means;
- (3) said engaging means being displaceable toward engagement with said convoluting means by rotation thereof in cooperation with said displacing means.
Dependencies are inferred from the claim text.