Cinematographic apparatus专利检索-卷闸门，大门和窗户专利检索查询-专利查询网

Cinematographic apparatus

阅读：501发布：2022-12-08

专利汇可以提供Cinematographic apparatus专利检索，专利查询，专利分析的服务。并且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.，下面是Cinematographic apparatus专利的具体信息内容。

权利要求

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. A combination as defined in claim 8, wherein said channel extends between said arresting and blocking devices.

10. 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.

11. 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.

12. A combination as defined in claim 10, wherein said torque transmitting means comprises a discrEte prime mover for each of said reels.

13. A combination as defined in claim 12, wherein said prime movers are electric d-c motors.

14. A combination as defined in claim 1, wherein said gate is disposed between said arresting and blocking devices.

15. 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.

16. 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.

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Cinematographic apparatus

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