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US4540261A Expired / Lapsed US ⏱️ 0.0 years remaining

Film transporting device for use in a camera

Assignee: Minolta Co Ltd
•
Filing: 1984-07-17
•
Granted: 1985-09-10
•
Expires: 2004-07-17
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Abstract

Abstract A film transporting device for use in a camera disclosed is so designed as to rewind the film such that no film portion is engaged in film take-up sprocket, resulting in an easy take out of the use film. The device in one form includes a counter that counts up the number of frames during a wind-up operation is carried out after the positioning of a film leader in contact with the take-up sprocket, and during a rewind operation, the counter counts down the same number of frames, or more, to locate the film leader in a disengaged position from the sprocket. The device in another form includes a film perforation detector. In this form, the film rewind operation is carried out until the perforation detector stops detecting the perforation. In a further form, the device includes a mechanical counter which counts up the frames used during wind-up operation, and during rewind operation counts down more than the number counted up to ensure that the film leader portion is withdrawn from the take-up sprocket.

Inventors

  • 👤 Toshiaki Matsumoto
  • 👤 Nobuyuki Taniguchi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 19:16
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/60; G03B1/62; G03B17/00; G03B17/36; G03B17/42; G03B17/425

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 140 words
A film transporting device for use in a camera, comprising: means for winding-up a film loaded in the camera; means for rewinding the film; means for counting, in a first direction, the number of frames wound-up by said winding-up means during the wind-up operation, said counting means being adopted for counting, in a second direction opposite to said first direction, the number of frames rewound by said rewinding means during said rewinding operation; means for enabling the count operation of said counting means upon closure of a back lid of the camera; means for resetting the number counted by said counting means into a predetermined initial condition upon opening of the back lid of the camera; and means for detecting when said counting means has counted, in said second direction, a predetermined number of frames from said predetermined initial condition.
Claim 2
Dependent Claim 140 words
A film transporting device for use in a camera, comprising: means for winding-up a film loaded in the camera; means for rewinding the film; means for counting, in a first direction, the number of frames wound-up by said winding-up means during the wind-up operation, said counting means being adopted for counting, in a second direction opposite to said first direction, the number of frames rewound by said rewinding means during said rewinding operation; means for enabling the count operation of said counting means upon closure of a back lid of the camera; means for resetting the number counted by said counting means into a predetermined initial condition upon opening of the back lid of the camera; and means for detecting when said counting means has counted, in said second direction, a predetermined number of frames from said predetermined initial condition.
Claim 3
Dependent Claim 42 words
A film transporting device as claimed in claim 1 wherein both of said winding-up and said rewinding means include a common motor which is rotatable in two rotational directions opposite to each other for winding-up the film or for rewinding the film.
Claim 4
Dependent Claim 99 words
The invention of claim 1 wherein the means for winding-up a film loaded in the camera includes a sprocket which has a plurality of sprocket teeth and which is rotatable for winding-up the film with the sprocket teeth being engaged in perforations of the film, and the means for counting includes means for detecting said perforations at a detecting position before the sprocket with respect to the direction of wind-up of the film, said perforation detecting means being adapted to produce a pulse upon detection of each of said perforations, said pulses being related to the number of frames.
Claim 5
Dependent Claim 33 words
A film transporting device as claimed in claim 2 further comprising means for displaying the number of the frames wound up by said winding-up means based on the number of the pulses counted.

References Cited (Backward Citations)

JPS5115928A Cited
US4294527A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-09-09 1989-03-11 1989-09-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-09-09 1993-03-11 1993-09-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-09-09 1997-03-11 1997-09-10 $7700.00 Window Closed / Lapsed

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