US4609163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic film winding device
Assignee: Canon Inc
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Filing: 1985-10-09
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Granted: 1986-09-02
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Expires: 2005-10-09
Abstract
Abstract A device for loading film wherein the narrow leader of the film is wound up on a takeup spool having a frictional member provided in a portion of the outer periphery thereof, while its edge opposite to that which has perforations is pressed against the frictional member, whereby the film leader is impelled towards the flank of the spool as the inside edge of the film leader on the aforesaid frictional member moves faster than the opposite edge. After one turn of the film leader around the spool, the outer corner of the end of the film leader is conducted so as not to engage perforations of the following area of the film.
Inventors
- 👤 Hiroyuki Kimura
- 👤 Mutsunobu Yazaki
- 👤 Tateo Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:44
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/28; G03B17/30; G03B2217/00; G03B2217/26; G03B2217/261
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
An automatic film winding device for a camera comprising: a film takeup spool for winding film, said film having a leader narrower than said film at one end of said film, said spool having a friction member provided to extend over at least a predetermined position approximately at the center of said spool for exerting a frictional force upon said film, said spool having its largest outer diameter at said predetermined position; and pressure means for pressing one side portion of said narrowed leader on said friction member at said predetermined position, said pressure means causing said one side portion of said film, which contacts said friction member to run at a faster speed than a side portion of said film opposite said one side portion.
Claim 2
Dependent Claim
126 words
An automatic film winding device for a camera comprising: a film takeup spool for winding film, said film having a leader narrower than said film at one end of said film, said spool having a friction member provided to extend over at least a predetermined position approximately at the center of said spool for exerting a frictional force upon said film, said spool having its largest outer diameter at said predetermined position; and pressure means for pressing one side portion of said narrowed leader on said friction member at said predetermined position, said pressure means causing said one side portion of said film, which contacts said friction member to run at a faster speed than a side portion of said film opposite said one side portion.
Claim 3
Dependent Claim
13 words
A device according to claim 1 wherein said pressure means includes a roller.
Claim 4
Dependent Claim
22 words
A device according to claim 2 wherein said pressure means includes a spring member which urges said roller in the pressing direction.
Claim 5
Dependent Claim
43 words
A device according to claim 1 wherein said pressure means is arranged to ensure that said leader at the end of said film comes under a subsequent portion of said film immediately as said leader runs in a single revolution around said spool.
Claim 6
Dependent Claim
21 words
A device according to claim 1 wherein said said spool has an engaging portion for engaging with perforations of said film.
Claim 7
Dependent Claim
62 words
A device according to claim 1, further comprising a spool chamber for housing said takeup spool, said pressure means comprising at least two pressure members within said spool chamber with the positions at which said pressure members are provided being at a location where the film enters into said spool chamber and a location at which the film exits from said chamber.
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) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |