US4673272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film transport apparatus for camera
Assignee: Canon Inc
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Filing: 1986-05-19
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Granted: 1987-06-16
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Expires: 2006-05-19
Abstract
Abstract A film transport apparatus having a spool for taking up film as it rotates, a sprocket for pulling the film in engagement with the perforations thereof toward the spool, and a windup drive system for driving the spool or the sprocket. The film transport apparatus is provided with control means for causing the windup drive system to drive both of the spool and the sprocket from the start of an auto-loading until before its termination, and then to drive only the spool at the terminal stage of the auto-loading, and detecting means for detecting that the film is not sent in the terminal stage of the auto-loading.
Inventors
- 👤 Masayuki Suzuki
- 👤 Tsunemasa Ohara
- 👤 Yoichi Tosaka
- 👤 Ryuichi Kobayashi
- 👤 Yoshihito Harada
- 👤 Masaharu Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:25
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
108 words
A film transport apparatus for a camera comprising: (a) a spool for taking up film by rotation; (b) a sprocket for sending the film to said spool by rotation; (c) first windup drive means for driving both of said spool and said sprocket; (d) second windup drive means for driving said spool; (e) control means for changing over the winding-up drive operation from said first windup drive means to said second windup drive means midway through a film auto-loading; and (f) detecting means for detecting that the film has not been moved to a prescribed length after the changeover of said windup drive operation by said control means.
Claim 2
Dependent Claim
108 words
A film transport apparatus for a camera comprising: (a) a spool for taking up film by rotation; (b) a sprocket for sending the film to said spool by rotation; (c) first windup drive means for driving both of said spool and said sprocket; (d) second windup drive means for driving said spool; (e) control means for changing over the winding-up drive operation from said first windup drive means to said second windup drive means midway through a film auto-loading; and (f) detecting means for detecting that the film has not been moved to a prescribed length after the changeover of said windup drive operation by said control means.
Claim 3
Dependent Claim
21 words
A camera according to claim 1, wherein said first and said second windup drive means have a common rotation drive source.
Claim 4
Dependent Claim
19 words
A camera according to claim 2, wherein as said rotation drive source use is made of a reversible motor.
Claim 5
Dependent Claim
53 words
A camera according to claim 3, wherein said first windup drive means has a transmission system which is operated when said reversible motor rotates in one direction, and said second windup drive means has a transmission system which is operated when said reversible motor rotates in another direction opposite to said one direction.
Claim 6
Dependent Claim
61 words
A camera according to claim 4, wherein the changing over from said first windup drive means to said second windup drive means by said control means in response to change of the direction of rotation of said reversible motor is performed by a clutch operation of a planetary clutch having a planetary gear which revolves by rotation of said reversible motor.
Claim 7
Dependent Claim
30 words
A camera according to claim 1, wherein said second windup drive means is set to be able to wind up at a higher speed than said first windup drive means.
Claim 8
Dependent Claim
22 words
A camera according to claim 1, wherein said spool is set to be larger in the peripheral speed ratio than said sprocket.
Claim 9
Dependent Claim
51 words
A camera according to claim 7, wherein a transmission system to said sprocket in said first windup drive means is provided with a one-way clutch, so that after the film has been snatched up by said spool, said sprocket is rotated in following-up relation to the winding movement of the film.
Claim 10
Dependent Claim
31 words
A camera according to claim 1, wherein said detecting means detects a state that the film does not move in the winding direction to a prescribed length within a prescribed time.
Claim 11
Dependent Claim
30 words
A camera according to claim 9, wherein said detecting means detects the movement of the film by detecting the rotating state of a rotary disc operatively connected to said sprocket.
Claim 12
Dependent Claim
33 words
A camera according to claim 10, wherein said rotary disc has a pulse pattern formed thereon, whereby said detection is performed by putting a contact member in sliding contact with said pulse pattern.
Claim 13
Dependent Claim
37 words
A camera according to claim 9, wherein said detecting means detects the movement of the film by detecting the rotating state of a detector wheel which is driven to rotate only by the movement of the film.
Claim 14
Dependent Claim
40 words
A camera according to claim 12, wherein said detector wheel is operatively connected to a rotary disc having formed thereon a pulse pattern, whereby said detection is performed by putting a contact member in sliding contact with said pulse pattern.
Claim 15
Dependent Claim
31 words
A camera according to claim 1, further comprising warning means for performing a warning operation when the film has not moved for being wound up is detected by said detecting means.
Claim 16
Dependent Claim
35 words
A camera according to claim 1, further comprising means for stopping the operation of said second windup drive means when the film has not moved for being wound up is detected by said detecting means.
Claim 17
Dependent Claim
67 words
A camera according to claim 1, wherein said detecting means performs, after the changeover of said windup drive operation, a first detection of discriminating that the film does not move for being wound up a first prescribed length, and a second detection of discriminating whether or not the film has moved for being wound up a second prescribed length which is smaller than said first prescribed length.
Claim 18
Dependent Claim
43 words
A camera according to claim 16, further comprising means for stopping the operation of said second windup drive means when the film has not moved for being wound up said second prescribed length is discriminated by said second detection of said detecting means.
Claim 19
Dependent Claim
75 words
A camera according to claim 16, further comprising means for changing over the windup drive operation from said second windup drive means to said first windup drive means when the film has not moved for being wound up said first prescribed length is discriminated by said first detection of said detecting means, and when the fact that the film has moved for being wound up said second prescribed length is discriminated by said second detection.
Claim 20
Dependent Claim
169 words
A film transport apparatus for a camera comprising: (a) a spool for taking up film by rotation; (b) a sprocket for sending the film to said spool by rotation; (c) first windup drive means for driving both of said spool and said sprocket; (d) second windup drive means for driving said spool; (e) control means for changing over the winding-up drive operation from said first windup drive means to said second windup drive means midway through a film auto-loading; and (f) detecting means for detecting that the film has not been moved to a prescribed length after the changeover of said windup drive operation by said control means. (g) rewind drive means for driving the film to be rewound to a film cartridge; and (h) rewind control means for stopping the windup drive operation by said second windup drive means and starting a rewind drive by said rewind drive means, when the film has not moved for being wound up a prescribed length is detected by said detecting means.
Claim 21
Dependent Claim
169 words
A film transport apparatus for a camera comprising: (a) a spool for taking up film by rotation; (b) a sprocket for sending the film to said spool by rotation; (c) first windup drive means for driving both of said spool and said sprocket; (d) second windup drive means for driving said spool; (e) control means for changing over the winding-up drive operation from said first windup drive means to said second windup drive means midway through a film auto-loading; and (f) detecting means for detecting that the film has not been moved to a prescribed length after the changeover of said windup drive operation by said control means. (g) rewind drive means for driving the film to be rewound to a film cartridge; and (h) rewind control means for stopping the windup drive operation by said second windup drive means and starting a rewind drive by said rewind drive means, when the film has not moved for being wound up a prescribed length is detected by said detecting means.
Claim 22
Dependent Claim
122 words
A film transport apparatus for a camera comprising: (a) a spool for taking up film by rotation; (b) a sprocket for sending the film to said spool by rotation; (c) first windup drive means for driving both of said spool and said sprocket; (d) second windup drive means for driving said spool; (e) control means for changing over the winding-up drive operation from said first windup drive means to said second windup drive means, said changeover by said control means being effected after the film has been wound up by a prescribed length; and (f) detecting means for detecting that the film has not been moved to a prescribed length after the changeover of said windup drive operation by said control means.
Claim 23
Dependent Claim
122 words
A film transport apparatus for a camera comprising: (a) a spool for taking up film by rotation; (b) a sprocket for sending the film to said spool by rotation; (c) first windup drive means for driving both of said spool and said sprocket; (d) second windup drive means for driving said spool; (e) control means for changing over the winding-up drive operation from said first windup drive means to said second windup drive means, said changeover by said control means being effected after the film has been wound up by a prescribed length; and (f) detecting means for detecting that the film has not been moved to a prescribed length after the changeover of said windup drive operation by said control means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |