Abstract In operative relation with a film counter, a detection mechanism detects film transport from the starting position to the first photographic position, the mechanism further being adapted to detect whether or not the film is being wound up on a take-up spool. The detection mechanism is associated with a release button locking mechanism and a film transport blocking mechanism so that until a predetermined amount of film has been wound up on the take-up spool, the film can be advanced without releasing the shutter. Upon detecting the winding of a predetermined amount of the film, the film transport blocking mechanism blocks the film winding operation and the release button is freed from locking. In operative relationship with subsequent shutter release and film winding operation, normal release button locking and film transport blocking operations are effected. Also mounted in the camera in operative relationship with the above mechanisms in another detection mechanism to be actuated upon detecting the loading of a film magazine, the magazine detection mechanism being so adapted that when a film magazine is not loaded the film transport blocking mechanism and the release button locking mechanism are allowed to function in operative relationship with film winding and shutter release operations and that upon detecting loading of the magazine, the magazine detection mechanism frees the film winding mechanism, permitting the foregoing mechanisms to operate accurately.
Inventors
👤 Keisuke Maeda
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-09 21:44
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A roll film camera comprising: a shutter release member; a film winding spool having an annular groove between the ends thereof; film sensing means including a sensing member movable between advanced and retracted positions in and out of engagement with said groove; first means for releasably locking said shutter release member in a retracted position and movable between lock and release positions; second means responsive to said film sensing means for urging said first means to its release position with the retraction of said sensing member; and third means movable with said shutter release member locking means for permitting and inhibiting the rotation of said spool with the respective lock and release positions of said shutter release member locking means.
Claim 2
Dependent Claim
120 words
A roll film camera comprising: a shutter release member; a film winding spool having an annular groove between the ends thereof; film sensing means including a sensing member movable between advanced and retracted positions in and out of engagement with said groove; first means for releasably locking said shutter release member in a retracted position and movable between lock and release positions; second means responsive to said film sensing means for urging said first means to its release position with the retraction of said sensing member; and third means movable with said shutter release member locking means for permitting and inhibiting the rotation of said spool with the respective lock and release positions of said shutter release member locking means.
Claim 3
Dependent Claim
40 words
The camera of claim 1 comprising a film frame counter, and means responsive to the position of said film frame counter for releasably maintaining said shutter release member locking means in its lock position independent of said film sensing means.
Claim 4
Dependent Claim
55 words
The camera of claim 1 including means for sensing the presence and absence of a film magazine in said camera and means responsive to said magazine sensing means in the absence of a magazine in the camera for shifting said shutter release member locking means to its release position independent of said film sensing means.
Claim 5
Dependent Claim
50 words
The camera of claim 3 including a film frame counter means responsive to the opening and closing of the camera back for preventing reverse rotation of said film counter, and means responsive to said magazine sensing means for urging said reverse rotation preventing means to a camera back closed position.
Claim 6
Dependent Claim
127 words
The mechanism of claim 1 wherein said second means comprises a first cam rotatable with the movement of said sensing means, a frame counter a second cam rotatable with said counter and a detection lever whose operation is restricted by said two cams, said detection lever being adapted to permit the operation of said third means and said release member locking means only when said two cams detect that a predetermined amount of the film has been wound up on said spool and to prevent the operation of said release member locking means and said third means and thereby keep said release member locked and said third means in a spool release position when a predetermined amount of film has not been wound up on said spool.
Claim 7
Dependent Claim
138 words
A roll film camera comprising in combination, a shutter release member; a film winding spool having an annular groove between the ends thereof; a winding detecting member movable into and out of engagement with said groove; an actuating arm movable with said detecting member; a shutter release lock member; means operatively coupling said lock member with the said actuating arm including a first cam and an engaging intermediate lever for releasably locking said shutter release member in response to the operation of the said actuating arm; a blocking member rotatable with the said shutter release lock member and operative to lock an abutment rotatable with said film winding spool with the release of the said shutter release member by said shutter release lock member and to unlock the said abutment with the locking of said shutter release member.
Claim 8
Dependent Claim
138 words
A roll film camera comprising in combination, a shutter release member; a film winding spool having an annular groove between the ends thereof; a winding detecting member movable into and out of engagement with said groove; an actuating arm movable with said detecting member; a shutter release lock member; means operatively coupling said lock member with the said actuating arm including a first cam and an engaging intermediate lever for releasably locking said shutter release member in response to the operation of the said actuating arm; a blocking member rotatable with the said shutter release lock member and operative to lock an abutment rotatable with said film winding spool with the release of the said shutter release member by said shutter release lock member and to unlock the said abutment with the locking of said shutter release member.