US3688960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for projector film stripping and threading mechanism
Assignee: Eastman Kodak Co
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Filing: 1971-05-03
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Granted: 1972-09-05
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Expires: 1991-05-03
Abstract
Abstract A self-threading motion picture projector includes a control device which, upon manually depressing a control lever, latches a film stripping and threading mechanism of the projector in its active position wherein it is effective to feed film from a roll of film supported by the projector. When the leading end of the film has entered a film gate of the projector and has been engaged by a film-advancing member (which advances the film at a rate faster than the film feeding mechanism), the control device is unlatched in response to the resulting tension of the film between the gate and the supply reel, thereby causing the stripping and threading mechanism to return to its inactive position so that the film can be projected. In the event that the control lever is momentarily depressed by the operator and then released before the control device has latched the film stripping and threading mechanism in its active position, means are provided for holding the control lever depressed until the mechanism is latched to prevent the mechanism''s return to its inactive position before the film is fed from a supported roll.
Inventors
- 👤 Leslie J Bunting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:48
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
In a control device for apparatus having (1) means for supporting a supply roll of web material comprising an elongated strip of web material having a leading end, (2) a stripping and threading mechanism adjustable to an active condition for feeding the leading end of the web material from a supported supply roll and to an inactive condition, (3) operating means movable to a first position and to a second position for adjusting said stripping and threading mechanism respectively to its inactive and active conditions, (4) resilient means for biasing said operatIng means toward said first position, and (5) means engageable for releasably latching said operating means in said second position when said stripping and threading mechanism is adjusted to said active condition; the improvement comprising means operable upon movement of said operating means away from said first position toward said second position for holding said operating means in said second position until said latching means is engaged.
Claim 2
Dependent Claim
158 words
In a control device for apparatus having (1) means for supporting a supply roll of web material comprising an elongated strip of web material having a leading end, (2) a stripping and threading mechanism adjustable to an active condition for feeding the leading end of the web material from a supported supply roll and to an inactive condition, (3) operating means movable to a first position and to a second position for adjusting said stripping and threading mechanism respectively to its inactive and active conditions, (4) resilient means for biasing said operatIng means toward said first position, and (5) means engageable for releasably latching said operating means in said second position when said stripping and threading mechanism is adjusted to said active condition; the improvement comprising means operable upon movement of said operating means away from said first position toward said second position for holding said operating means in said second position until said latching means is engaged.
Claim 3
Dependent Claim
34 words
The improvement as defined in claim 1 wherein said holding means includes means permitting movement of said operating means away from said second position to said first position upon disengagement of said latching means.
Claim 4
Dependent Claim
244 words
In a control device for a motion picture projector of the type having (1) means for supporting a film supply roll comprising an elongate strip of film having a leading end, (2) a stripping and threading mechanism adjustable to an active condition for feeding the leading end of the film from a supported supply roll and to an active condition, (3) a rotating drive shaft, (4) a cam member, (5) clutch-operating means coupled to the shaft and to the cam member and movable between a first position and a second position for effecting movement of said cam member by said drive shaft to predetermined initial and intermediate locations corresponding respectively to said first and second positions of said clutch-operating means, (6) first control means operated by said cam member for adjusting said stripping and threading mechanism to said first condition in response to movement of said cam member to said intermediate location, and (7) a latch member movable into operative latching engagement with said clutch-operating means at said second position thereof in response to movement of said cam member from said initial location to said intermediate location to releasably retain said clutch-operating means in said second position; the improvement comprising second control means operated by said cam member upon movement of said cam member away from said initial location toward said intermediate location for holding said clutch-operating means at said second position thereof until said latch is moved into engagement with said clutch-operating means.
Claim 5
Dependent Claim
244 words
In a control device for a motion picture projector of the type having (1) means for supporting a film supply roll comprising an elongate strip of film having a leading end, (2) a stripping and threading mechanism adjustable to an active condition for feeding the leading end of the film from a supported supply roll and to an active condition, (3) a rotating drive shaft, (4) a cam member, (5) clutch-operating means coupled to the shaft and to the cam member and movable between a first position and a second position for effecting movement of said cam member by said drive shaft to predetermined initial and intermediate locations corresponding respectively to said first and second positions of said clutch-operating means, (6) first control means operated by said cam member for adjusting said stripping and threading mechanism to said first condition in response to movement of said cam member to said intermediate location, and (7) a latch member movable into operative latching engagement with said clutch-operating means at said second position thereof in response to movement of said cam member from said initial location to said intermediate location to releasably retain said clutch-operating means in said second position; the improvement comprising second control means operated by said cam member upon movement of said cam member away from said initial location toward said intermediate location for holding said clutch-operating means at said second position thereof until said latch is moved into engagement with said clutch-operating means.
Claim 6
Dependent Claim
56 words
The improvement as defined in claim 3 wherein said cam member comprises: a first cam lobe operatively associated with said latch member for moving said latch member into operative latching engagement with said clutch-operating means; and a second cam lobe operatively associated with said clutch-operating means for holding said clutch-operating means at said second position thereof.
Claim 7
Dependent Claim
31 words
The improvement as defined in claim 4 wherein said second cam lobe is shaped to permit movement of said clutch-operating means to its first position upon disengagement of said latch member.
Claim 8
Dependent Claim
18 words
The improvement as defined in claim 5 wherein said cam member is rotatable concentrically with said drive shaft.
References Cited (Backward Citations)
US3558028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |