US2424739A - Motion-picture projector - Google Patents

Motion-picture projector Download PDF

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Publication number
US2424739A
US2424739A US525451A US52545144A US2424739A US 2424739 A US2424739 A US 2424739A US 525451 A US525451 A US 525451A US 52545144 A US52545144 A US 52545144A US 2424739 A US2424739 A US 2424739A
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Prior art keywords
shaft
reel
arm
frame
film
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Expired - Lifetime
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US525451A
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Canady Don
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/32—Details specially adapted for motion-picture projection
    • G03B21/321—Holders for films, e.g. reels, cassettes, spindles

Definitions

  • This invention relates primarily to a take-up reel support for motion picture projectors, al though it will be apparent that the device may be used with various other mechanisms wherein it is desired to increase the tension on a Winding reel as the size increases. It is desirable in takeup reel supports to provide means for increasing the tension on the driving means as the film on the reel increases in weight.
  • the object of my invention is to provide a friction clutch driving mechanism for a take-up reel whereby the weight of the reel will lead the clutch.
  • a further object of my invention is to provide an arm supported pivoted on the frame carrying a driven shaft and a film reel driving shaft, whereby the weight of the reel winding up the film will create a pressure on a friction clutch between the driven shaft and the drive shaft.
  • Fig. 1 is a plan View of my improved mechanism
  • Fig. 2 is a side view of the same.
  • My improved device comprises an arm ll rpivoted to the frame of the projector as at [2. When the projector is not in use, the arm may be removed from or folded onto the machine l3.
  • a shaft I4 extending from the projector is provided with one part of a friction clutch I5.
  • the arm ll carries a shaft [6 having the other portion I! of the friction clutch attached thereto.
  • the other end of the shaft [6 is provided with a bevel gear [8 meshing with a bevel gear 19 on a cross-shaft 2
  • This cross-shaft is provided with a suitable film reel engaging portion 2
  • the take-up reel on a movie projector while being driven, must keep a tension on the film and have some form of slippage in the drive to compensate for the increased diameter of the film on the reel.
  • the clutch permits the film shaft to rotate at a speed suflicient to roll up the film on the reel and as the reel becomes loaded the added weight increase the tension on the friction clutch to continue to drive the reel with the proper friction being applied.
  • a take-up device comprising a frame, a drive shaft carried by said frame, an arm pivoted to said frame and having a portion extending substantially parallel to said drive shaft, a driven shaft carried by said arm movable into axial alignment with said drive shaft, a friction clutch interposed between the ends of said shafts, and a transverse reel shaft mounted in the end of said arm and driven by said driven shaft.
  • a take-up device comprising a frame, a drive shaft carried by said frame, an arm pivoted to said frame and having a portion extending substantially parallel to said drive shaft, a driven shaft carried by said arm movable into axial alignment with said drive shaft, a reel shaft mounted in the end of said arm and having driving connection with said driven shaft, and a friction clutch interposed between the ends of said drive shaft and said driven shaft whereby increased Weight on said reel shaft will increase the friction in said friction clutch.
  • a take-up device for a movie projector comprising a frame, a drive shaft journalled on said frame, a friction member secured to the end of said shaft, n arm pivoted on said frame movable to extend in axial alignment with said shaft, a driven shaft carried by said arm and movable into axial alignment with said drive shaft, a friction member secured to one end of said driven shaft mating with said first named friction member, a film reel shaft geared to the extending end of said driven shaft whereby increased weight on said film reel shaft will increase the friction between said friction members.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Cameras Including Film Mechanisms (AREA)

Description

July 29, 1947. D. CANADY 2,424,739
MOTION PICTURE PROJECTOR Filed March 7, 1944 I INVENTOR. DON CANADY.
ATTORNEY- Patented July 29, 1947 UNITED STATES TENT OFFICE MOTION -PICTURE PROJECTOR Don Canady, Cleveland, Ohio Application March 7, 1944, Serial No. 525,451
3 Claims. 1
This invention relates primarily to a take-up reel support for motion picture projectors, al though it will be apparent that the device may be used with various other mechanisms wherein it is desired to increase the tension on a Winding reel as the size increases. It is desirable in takeup reel supports to provide means for increasing the tension on the driving means as the film on the reel increases in weight.
The object of my invention is to provide a friction clutch driving mechanism for a take-up reel whereby the weight of the reel will lead the clutch.
A further object of my invention is to provide an arm supported pivoted on the frame carrying a driven shaft and a film reel driving shaft, whereby the weight of the reel winding up the film will create a pressure on a friction clutch between the driven shaft and the drive shaft.
My invention will be further readily understood from the following description and claims, and from the drawings, in which latter:
Fig. 1 is a plan View of my improved mechanism; and,
Fig. 2 is a side view of the same.
My improved device comprises an arm ll rpivoted to the frame of the projector as at [2. When the projector is not in use, the arm may be removed from or folded onto the machine l3. A shaft I4 extending from the projector is provided with one part of a friction clutch I5. The arm ll carries a shaft [6 having the other portion I! of the friction clutch attached thereto. The other end of the shaft [6 is provided with a bevel gear [8 meshing with a bevel gear 19 on a cross-shaft 2|] journalled in the end of the arm II. This cross-shaft is provided with a suitable film reel engaging portion 2|.
The take-up reel on a movie projector, while being driven, must keep a tension on the film and have some form of slippage in the drive to compensate for the increased diameter of the film on the reel. With my improved structure, the clutch permits the film shaft to rotate at a speed suflicient to roll up the film on the reel and as the reel becomes loaded the added weight increase the tension on the friction clutch to continue to drive the reel with the proper friction being applied.
Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:
1. A take-up device comprising a frame, a drive shaft carried by said frame, an arm pivoted to said frame and having a portion extending substantially parallel to said drive shaft, a driven shaft carried by said arm movable into axial alignment with said drive shaft, a friction clutch interposed between the ends of said shafts, and a transverse reel shaft mounted in the end of said arm and driven by said driven shaft.
2. A take-up device comprising a frame, a drive shaft carried by said frame, an arm pivoted to said frame and having a portion extending substantially parallel to said drive shaft, a driven shaft carried by said arm movable into axial alignment with said drive shaft, a reel shaft mounted in the end of said arm and having driving connection with said driven shaft, and a friction clutch interposed between the ends of said drive shaft and said driven shaft whereby increased Weight on said reel shaft will increase the friction in said friction clutch.
3. A take-up device for a movie projector comprising a frame, a drive shaft journalled on said frame, a friction member secured to the end of said shaft, n arm pivoted on said frame movable to extend in axial alignment with said shaft, a driven shaft carried by said arm and movable into axial alignment with said drive shaft, a friction member secured to one end of said driven shaft mating with said first named friction member, a film reel shaft geared to the extending end of said driven shaft whereby increased weight on said film reel shaft will increase the friction between said friction members.
DON CANADY.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,277,559 Emory Sept. 3, 1918 1,346,357 Wenderhold July 13, 1920 1,850,755 Kindelmann Mar. 22, 1932 FOREIGN PATENTS Number Country Date 4,643 Great Britain Dec. 14, 1911 758,927 France Nov. 7, 1933
US525451A 1944-03-07 1944-03-07 Motion-picture projector Expired - Lifetime US2424739A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622821A (en) * 1949-07-07 1952-12-23 Western Electric Co Clutch for reels
US2622820A (en) * 1949-07-07 1952-12-23 Western Electric Co Apparatus for handling strip material
US3113742A (en) * 1961-05-25 1963-12-10 Scm Corp Record medium winder
US4044670A (en) * 1973-09-14 1977-08-30 Gestetner Limited Stencil duplicator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191104643A (en) * 1911-02-24 1911-12-14 Arthur Hibbert Diggle Improvements in and connected with Kinematograph Apparatus.
US1277559A (en) * 1914-06-11 1918-09-03 Baird Motion Picture Machine Co Take-up mechanism for kinetoscopes.
US1346357A (en) * 1915-07-20 1920-07-13 Cru Patents Corp Variable-speed mechanism
US1850755A (en) * 1929-10-31 1932-03-22 Int Projector Corp Take-up device
FR758927A (en) * 1932-07-27 1934-01-26 Aeg Method and device for driving and braking winding and unwinding coils

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191104643A (en) * 1911-02-24 1911-12-14 Arthur Hibbert Diggle Improvements in and connected with Kinematograph Apparatus.
US1277559A (en) * 1914-06-11 1918-09-03 Baird Motion Picture Machine Co Take-up mechanism for kinetoscopes.
US1346357A (en) * 1915-07-20 1920-07-13 Cru Patents Corp Variable-speed mechanism
US1850755A (en) * 1929-10-31 1932-03-22 Int Projector Corp Take-up device
FR758927A (en) * 1932-07-27 1934-01-26 Aeg Method and device for driving and braking winding and unwinding coils

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622821A (en) * 1949-07-07 1952-12-23 Western Electric Co Clutch for reels
US2622820A (en) * 1949-07-07 1952-12-23 Western Electric Co Apparatus for handling strip material
US3113742A (en) * 1961-05-25 1963-12-10 Scm Corp Record medium winder
US4044670A (en) * 1973-09-14 1977-08-30 Gestetner Limited Stencil duplicator

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