US3558028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for self-threading motion picture projector
Assignee: Eastman Kodak Co
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Filing: 1969-04-28
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Granted: 1971-01-26
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Expires: 1989-04-28
Abstract
Abstract A self-threading cartridge loaded motion picture projector is equipped with a simple mechanical control device which latches the film stripping and threading elements of the projector in their respective operative positions. When the leading end of the film has entered the film gate and has been engaged by a filmadvancing member, the control device is unlatched in response to the resulting tensioning of the film between the gate and the supply reel, thereby causing the stripping and threading elements to be returned automatically to their respective inoperative positions so that the film can be projected.
Inventors
- 👤 Leslie J Bunting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:08
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/56
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
232 words
In a motion picture projector including: a. means for supporting a film supply roll comprising an elongate strip of film having a leading end, b. a film advancing member engageable with said film to move the same away from said roll, c. a threading device adapted to deliver the leading end of said strip of film from said roll to said film-advancing member, said device being adjustable 1. to a first condition out of engagement with said film supply roll and 2. to a second condition wherein said threading device is engaged with said film supply roll, d. an operating member movable to a first position and to a second position to adjust said threading device respectively to said first and second conditions thereof, e. resilient means biasing said operating member toward said first position, and f. latch means adapted to releasably latch said operating member in said second position, the improvement comprising; g. film tension sensing means adapted to sense the tension of a portion of said strip of film extending from said film supply roll into engagement with said film-advancing member, and h. latch release means operable by said film tension-sensing means to release said latch means from latching engagement with said operating member in response to the occurrence of a predetermined tension in the portion of said strip of film between said film supply roll and said film-advancing member.
Claim 2
Dependent Claim
232 words
In a motion picture projector including: a. means for supporting a film supply roll comprising an elongate strip of film having a leading end, b. a film advancing member engageable with said film to move the same away from said roll, c. a threading device adapted to deliver the leading end of said strip of film from said roll to said film-advancing member, said device being adjustable 1. to a first condition out of engagement with said film supply roll and 2. to a second condition wherein said threading device is engaged with said film supply roll, d. an operating member movable to a first position and to a second position to adjust said threading device respectively to said first and second conditions thereof, e. resilient means biasing said operating member toward said first position, and f. latch means adapted to releasably latch said operating member in said second position, the improvement comprising; g. film tension sensing means adapted to sense the tension of a portion of said strip of film extending from said film supply roll into engagement with said film-advancing member, and h. latch release means operable by said film tension-sensing means to release said latch means from latching engagement with said operating member in response to the occurrence of a predetermined tension in the portion of said strip of film between said film supply roll and said film-advancing member.
Claim 3
Dependent Claim
94 words
a latch release position at which said film guide member defines a shorter second film path between said film supply roll and said film-advancing member, b. resilient means biasing said film guide member toward said threading position, and c. means for moving said latch member out of operative latching engagement with said clutch-operating member in response to movement of said film guide member to said latch release position in opposition to said resilient means under the influence of tension developed in said strip of film between said film supply roll and said film-advancing member.
Claim 4
Dependent Claim
94 words
a latch release position at which said film guide member defines a shorter second film path between said film supply roll and said film-advancing member, b. resilient means biasing said film guide member toward said threading position, and c. means for moving said latch member out of operative latching engagement with said clutch-operating member in response to movement of said film guide member to said latch release position in opposition to said resilient means under the influence of tension developed in said strip of film between said film supply roll and said film-advancing member.
Claim 5
Dependent Claim
168 words
to said second condition in response to rotation of said cam member to said intermediate rotative location, the improvement comprising; i. a control member movable manually from a first location to a second location to move said clutch operating member from said first position to said second position, j. a latch member movable into operative latching engagement with said clutch-operating member at said second position thereof in response to rotation of said cam member from said initial rotative location toward said intermediate rotative location to releasably retain said clutch-operating member in said second position, and k. a film tension-sensing mechanism engageable by a portion of said strip of film between said film supply roll and said film-advancing member, said film tension-sensing mechanism being adapted to move said latch member out of operative latching engagement with said clutch-operating member in response to predetermined tensioning of a portion of said film between said film-advancing member and the supply roll and while said threading device is still in said second condition.
Claim 6
Dependent Claim
168 words
to said second condition in response to rotation of said cam member to said intermediate rotative location, the improvement comprising; i. a control member movable manually from a first location to a second location to move said clutch operating member from said first position to said second position, j. a latch member movable into operative latching engagement with said clutch-operating member at said second position thereof in response to rotation of said cam member from said initial rotative location toward said intermediate rotative location to releasably retain said clutch-operating member in said second position, and k. a film tension-sensing mechanism engageable by a portion of said strip of film between said film supply roll and said film-advancing member, said film tension-sensing mechanism being adapted to move said latch member out of operative latching engagement with said clutch-operating member in response to predetermined tensioning of a portion of said film between said film-advancing member and the supply roll and while said threading device is still in said second condition.
Claim 7
Dependent Claim
97 words
to a second condition wherein said threading device is engaged with said film supply roll, d. a rotating drive shaft, e. a rotatable cam member, f. a releasable clutch adapted to couple said cam member rotatively with said drive shaft, g. a clutch-operating member movable between a first position and a second position to effect rotation of said cam member by said drive shaft to predetermined initial and intermediate rotative locations corresponding respectively to said first and second positions of said clutch-operating member, h. threading control means operated by said cam member for adjusting said threading device,
Claim 8
Dependent Claim
97 words
to a second condition wherein said threading device is engaged with said film supply roll, d. a rotating drive shaft, e. a rotatable cam member, f. a releasable clutch adapted to couple said cam member rotatively with said drive shaft, g. a clutch-operating member movable between a first position and a second position to effect rotation of said cam member by said drive shaft to predetermined initial and intermediate rotative locations corresponding respectively to said first and second positions of said clutch-operating member, h. threading control means operated by said cam member for adjusting said threading device,
Claim 9
Dependent Claim
67 words
In a motion picture projector including: a. means for supporting a film supply roll comprising an elongate strip of film having a leading end, b. a film-advancing member engageable with said film to move the same away from said roll, c. a threading device adapted to deliver the leading end of said strip of film from said roll to said film advancing member, said device being adjustable
Claim 10
Dependent Claim
67 words
In a motion picture projector including: a. means for supporting a film supply roll comprising an elongate strip of film having a leading end, b. a film-advancing member engageable with said film to move the same away from said roll, c. a threading device adapted to deliver the leading end of said strip of film from said roll to said film advancing member, said device being adjustable
Claim 11
Dependent Claim
150 words
to a second condition wherein said threading device is engaged with said film supply roll, d. an operating member movable to a first position and to a second position to adjust said threading device respectively to said first and second conditions thereof, e. resilient means biasing said operating member toward said first position, and f. latch means adapted to releasably latch said operating member in said second position, the improvement comprising; g. film tension sensing means adapted to sense the tension of a portion of said strip of film extending from said film supply roll into engagement with said film-advancing member, and h. latch release means operable by said film tension-sensing means to release said latch means from latching engagement with said operating member in response to the occurrence of a predetermined tension in the portion of said strip of film between said film supply roll and said film-advancing member.
Claim 12
Dependent Claim
150 words
to a second condition wherein said threading device is engaged with said film supply roll, d. an operating member movable to a first position and to a second position to adjust said threading device respectively to said first and second conditions thereof, e. resilient means biasing said operating member toward said first position, and f. latch means adapted to releasably latch said operating member in said second position, the improvement comprising; g. film tension sensing means adapted to sense the tension of a portion of said strip of film extending from said film supply roll into engagement with said film-advancing member, and h. latch release means operable by said film tension-sensing means to release said latch means from latching engagement with said operating member in response to the occurrence of a predetermined tension in the portion of said strip of film between said film supply roll and said film-advancing member.
Claim 13
Dependent Claim
48 words
The invention defined by claim 2 including manual latch disengagement means adapted to release said latch member from operative latching engagement with said clutch operating member at said second position thereof in response to manual movement of said control member from said second location to said first location.
Claim 14
Dependent Claim
23 words
The invention defined by claim 2 in which said film tension sensing mechanism comprises: a. a film guide member supported for movement between
References Cited (Backward Citations)
US3208682A
Cited
US3429518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |