US3730616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cinematographic apparatus
Assignee: Agfa Gevaert AG
•
Filing: 1971-09-23
•
Granted: 1973-05-01
•
Expires: 1991-09-23
Abstract
Abstract A motion picture projector wherein the supply and takeup reels are rotatable in either direction by way of friction clutches and wherein the film is moved stepwise past the gate by two transporting devices which employ friction wheels and pressing rollers serving to bias the film against the respective friction wheels. The friction wheels are driven by way of friction clutches from a separate motor or from the motor which serves to drive the supply and takeup reels. An electromagnetically operated arresting device is located between the gate and one of the transporting devices to hold the film against lengthwise movement by the one transporting device when the other transporting device is free to move the film past the gate, and an electromagnetically operated blocking device is mounted between the gate and the other transporting device to hold the film against movement past the gate when the image of a film frame is being projected and while the arresting device is inoperative to thus permit the film to form a loop upstream of the gate.
Inventors
- 👤 E Fliesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:52
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/18; G03B1/20; G03B1/22
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
258 words
In a cinematographic apparatus wherein motion picture film is transported lengthwise along a predetermined path, a combination comprising a film gate adjacent to said path; first and second transporting means adjacent to longitudinally spaced-apart portions of said path and operative to urge the film in said path tO move past said gate in at least one direction, each of said transporting means comprises clutch means for continuously urging the film in said one direction; a blocking device adjacent to said path between said transporting means and actuatable to assume to a first condition in which it blocks the movement of film past said gate and a second condition in which it allows the movement of film past said gate by the clutch means of one of said transporting means; and an arresting device adjacent to said path between said blocking device and the other of said transporting means and movable between operative and inoperative positions in which said arresting device respectively prevents and permits the transport of film by the clutch means of the other of said transporting means, the film being looped in a predetermined portion of said path upstream of said gate under the action of the clutch means of said other transporting means in the inoperative position of said arresting device and in the first condition of said blocking device, and the thus looped film being advanced past said gate by the clutch means of said one transporting means in the operative position of said arresting device and the second condition of said blocking device.
Claim 2
Dependent Claim
258 words
In a cinematographic apparatus wherein motion picture film is transported lengthwise along a predetermined path, a combination comprising a film gate adjacent to said path; first and second transporting means adjacent to longitudinally spaced-apart portions of said path and operative to urge the film in said path tO move past said gate in at least one direction, each of said transporting means comprises clutch means for continuously urging the film in said one direction; a blocking device adjacent to said path between said transporting means and actuatable to assume to a first condition in which it blocks the movement of film past said gate and a second condition in which it allows the movement of film past said gate by the clutch means of one of said transporting means; and an arresting device adjacent to said path between said blocking device and the other of said transporting means and movable between operative and inoperative positions in which said arresting device respectively prevents and permits the transport of film by the clutch means of the other of said transporting means, the film being looped in a predetermined portion of said path upstream of said gate under the action of the clutch means of said other transporting means in the inoperative position of said arresting device and in the first condition of said blocking device, and the thus looped film being advanced past said gate by the clutch means of said one transporting means in the operative position of said arresting device and the second condition of said blocking device.
Claim 3
Dependent Claim
35 words
A combination as defined in claim 1, further comprising first electromagnet means for moving said arresting device between said operative and inoperative positions and second electromagnet means for changing the condition of said blocking means.
Claim 4
Dependent Claim
55 words
A combination as defined in claim 1, wherein at least one of said transporting means further comprises a continuously driven friction wheel adjacent to one side of said path and a pressing roller adjacent to the other side of said path opposite said friction wheel and arranged to bias the film against said friction wheel.
Claim 5
Dependent Claim
42 words
A combination as defined in claim 3, wherein said last mentioned transporting means further comprises a rotary driving element and the clutch means of said last mentioned transporting means comprises a friction clutch interposed between said driving element and said friction wheel.
Claim 6
Dependent Claim
74 words
A combination as defined in claim 1, wherein said blocking device comprises a stationary portion adjacent to one side of said path and a movable portion adjacent to the other side of said path opposite said stationary portion, and further comprising means for urging said movable portion against the adjacent portion of the film with a force which is greater in said first condition and smaller in said second condition of said blocking means.
Claim 7
Dependent Claim
29 words
A combination as defined in claim 5, wherein the difference between the positions of said movable portion in said first and second conditions of said blocking device is minimal.
Claim 8
Dependent Claim
38 words
A combination as defined in claim 5, wherein said means for urging said movable portion against the adjacent portion of the film in said path comprises an electromagnet and said movable portion constitutes the armature of such electromagnet.
Claim 9
Dependent Claim
46 words
A combination as defined in claim 1, further comprising a channel defining at least a portion of said path, said channel comprising an enlarged portion wherein the film is looped in the inoperative position of said arresting device and the first condition of said blocking device.
Claim 10
Dependent Claim
17 words
A combination as defined in claim 8, wherein said channel extends between said arresting and blocking devices.
Claim 11
Dependent Claim
45 words
A combination as defined in claim 1, further comprising rotary supply and takeup reels for the film and means for transmitting to said reels torque so as to rotate both said reels in the same direction during transport of the film in said one direction.
Claim 12
Dependent Claim
40 words
A combination as defined in claim 10, wherein said torque transmitting means comprises a pair of rotary driving elements, one for each of said reels, and friction clutch means interposed between each of said driving elements and the respective reel.
Claim 13
Dependent Claim
22 words
A combination as defined in claim 10, wherein said torque transmitting means comprises a discrEte prime mover for each of said reels.
Claim 14
Dependent Claim
15 words
A combination as defined in claim 12, wherein said prime movers are electric d-c motors.
Claim 15
Dependent Claim
18 words
A combination as defined in claim 1, wherein said gate is disposed between said arresting and blocking devices.
Claim 16
Dependent Claim
35 words
A combination as defined in claim 1, further comprising supply and takeup reels for the film and a single prime mover arranged to rotate said reels and to operate said first and second transporting means.
Claim 17
Dependent Claim
28 words
A combination as defined in claim 1, wherein the film is perforated and said arresting device extends through a perforation of the film in the operative position thereof.
References Cited (Backward Citations)
US666495A
Cited
US1855773A
Cited
US2108852A
Cited
US2412551A
Cited
US2788703A
Cited
US3165250A
Cited
US3471228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |