US3628749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic film threading device
Assignee: Eastman Kodak Co
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Filing: 1969-11-12
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Granted: 1971-12-21
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Expires: 1989-11-12
Abstract
Abstract A film-threading device for a cinematographic projector and/or camera comprises a friction or drive wheel adapted to be placed in engagement with the outer convolution of a roll of film or the like. The film roll may be positioned within a cartridge on a projector and/or camera or the film roll may be unenclosed. A pressure bar is also movable into engagement with the film roll. The bar has a mirror surface. A light source directs a light beam against the mirror surface and then to a photocell. In operation the film roll is first rotated in a takeup direction and, as the leading end of the film passes the pressure bar, it breaks the light beam to the photocell. This effects a switching operation which causes the drive wheel to be driven in a direction for feeding the leading end of the film from the roll to a selfthreading mechanism of the projector, camera or the like.
Inventors
- 👤 Wolfgang Ort
- 👤 Gerhard Brauning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:54
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
An automatic film-threading mechanism for removing the leading end portion from a spool of web material or the like comprising: a drive member for rotating the film roll in an unwinding direction, means mounting said drive member for movement into and out of engagement with the film roll, means for driving said drive member in a direction for effecting movement of the spool in an unwinding direction, means for initially driving the spool in a direction for taking up strip material onto the spool, means for sensing the presence of the leading end of the web material at a particular position relative to said drive member when the spool is being driven in a takeup direction, and means coupled to said sensing means and to said means for driving said drive member for initiating driving said drive member in a direction to cause movement of the spool in an unwinding direction.
Claim 2
Dependent Claim
151 words
An automatic film-threading mechanism for removing the leading end portion from a spool of web material or the like comprising: a drive member for rotating the film roll in an unwinding direction, means mounting said drive member for movement into and out of engagement with the film roll, means for driving said drive member in a direction for effecting movement of the spool in an unwinding direction, means for initially driving the spool in a direction for taking up strip material onto the spool, means for sensing the presence of the leading end of the web material at a particular position relative to said drive member when the spool is being driven in a takeup direction, and means coupled to said sensing means and to said means for driving said drive member for initiating driving said drive member in a direction to cause movement of the spool in an unwinding direction.
Claim 3
Dependent Claim
170 words
An automatic film-threading mechanism for removing the leading end portion from a spool of web material or the like comprising: a drive member for rotating the film roll in an unwinding direction, means mounting said drive member for movement into and out of engagement with the film roll, means for driving said drive member in a direction for effecting movement of the spool in an unwinding direction, means for initially driving the spool in a direction for taking up strip material onto the spool, means for sensing the presence of the leading end of the web material at a particular position relative to said drive member when the spool is being driven in a takeup direction, means coupled to said sensing means and to said means for driving said drive member for driving said drive member in a direction to cause movement of the spool in an unwinding direction, and means for separating the leading end of the web material from the spool during its rotation in the takeup direction.
Claim 4
Dependent Claim
170 words
An automatic film-threading mechanism for removing the leading end portion from a spool of web material or the like comprising: a drive member for rotating the film roll in an unwinding direction, means mounting said drive member for movement into and out of engagement with the film roll, means for driving said drive member in a direction for effecting movement of the spool in an unwinding direction, means for initially driving the spool in a direction for taking up strip material onto the spool, means for sensing the presence of the leading end of the web material at a particular position relative to said drive member when the spool is being driven in a takeup direction, means coupled to said sensing means and to said means for driving said drive member for driving said drive member in a direction to cause movement of the spool in an unwinding direction, and means for separating the leading end of the web material from the spool during its rotation in the takeup direction.
Claim 5
Dependent Claim
53 words
An automatic film-threading mechanism as set forth in claim 2 wherein the separating means, sensing means and drive member are arranged relative to the spool so that the leading end of the web material successively passes the separating means, sensing means and drive member when the spool is driven in the takeup direction.
Claim 6
Dependent Claim
171 words
An automatic film-threading mechanism for removing the leading end portion from a spool of web material or the like comprising: a drive member for rotating the film roll in an unwinding direction, means mounting said drive member for movement into and out of engagement with the film roll, means for driving said drive member in a direction for effecting movement of the spool in an unwinding direction, means for initially driving the spool in a direction for taking up the strip material onto the spool, means for sensing the presence of the leading end of the web material at a particular position relative to said drive member when the spool is being driven in a takeup direction, said sensing means comprising a photosensitive member and a light source for directing a light beam toward said photosensitive member, and means coupled to said sensing means and to said means for driving said drive member for driving said drive member in a direction to cause movement of the spool in an unwinding direction.
Claim 7
Dependent Claim
171 words
An automatic film-threading mechanism for removing the leading end portion from a spool of web material or the like comprising: a drive member for rotating the film roll in an unwinding direction, means mounting said drive member for movement into and out of engagement with the film roll, means for driving said drive member in a direction for effecting movement of the spool in an unwinding direction, means for initially driving the spool in a direction for taking up the strip material onto the spool, means for sensing the presence of the leading end of the web material at a particular position relative to said drive member when the spool is being driven in a takeup direction, said sensing means comprising a photosensitive member and a light source for directing a light beam toward said photosensitive member, and means coupled to said sensing means and to said means for driving said drive member for driving said drive member in a direction to cause movement of the spool in an unwinding direction.
Claim 8
Dependent Claim
74 words
An automatic film-threading mechanism as set forth in claim 4 further comprising an arm for engaging the spool and for effecting rapid separation of the leading end of the web material as the leading end passes the arm, and a light-reflective surface on said arm for deflecting the light beam from the light to the photosensitive member so that the leading end of the material interrupts the light as it passes from the arm.
References Cited (Backward Citations)
US2891736A
Cited
US3497157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |