US2241689A - Cinematographic apparatus - Google Patents

Cinematographic apparatus Download PDF

Info

Publication number
US2241689A
US2241689A US276567A US27656739A US2241689A US 2241689 A US2241689 A US 2241689A US 276567 A US276567 A US 276567A US 27656739 A US27656739 A US 27656739A US 2241689 A US2241689 A US 2241689A
Authority
US
United States
Prior art keywords
shaft
film
reel
screw
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US276567A
Other languages
English (en)
Inventor
Lloyed E Whittaker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technicolor Motion Picture Corp
Original Assignee
Technicolor Motion Picture Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Technicolor Motion Picture Corp filed Critical Technicolor Motion Picture Corp
Priority to US276567A priority Critical patent/US2241689A/en
Priority to GB4618/40A priority patent/GB536356A/en
Priority to FR864676D priority patent/FR864676A/fr
Application granted granted Critical
Publication of US2241689A publication Critical patent/US2241689A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • G03B21/43—Driving mechanisms

Definitions

  • the object of the present invention is to mainby the take-up reel more uniform as the roll increases in diameter and more particularly to avoid excess pull on the film while the diameter of the roll is still small.
  • the apparatus comprises, in combination with means for exerting a yielding drag on the take-up reel in the direction tending to wind the film upon the reel, means for automatically and progressively increasing the drag as reel, thereby progressively to increase the driving force applied to the reel as the diameter of the roll increases. While the increase in the drag should be directly in proportion to the increase in diameter of the roll, the proportion need not be in straight-line relationship.
  • the apparatus may comprise a driven rotor, such as a shaft, for rotating the reel, a driving rotor, such as a tubular shaft surrounding the driven shaft, and an ordinary dry-plate clutch interconnecting the two rotors.
  • the apparatus comprises a tubular screw surrounding the reel shaft, with a compression spring between the clutch and screw for pressing the friction surfaces together, and means driven by the shaft for advancing the screw to increase the tension of the spring in proportion to the increase in diameter of the roll of film on the take-up reel.
  • FIG. 1 is an axial section showing parts in top plan
  • Fig. 2 is a section on line 2--2 of Fig. 1;
  • Fig. 4 is a section on line 4-4 of Fig. 1.
  • the apparatus is shown in connection with a film magazine I mounted on the housing 3 by interengaging parts 2 and 4.
  • the take-up reel is shown at 5 and the roll of film at 6.
  • the take-up reel is driven by a shaft 1 having portions 8, 9, l0 and H of different diameters with shoulders l2, l3, l4 and I5 between the portions of different diameters.
  • a tubular shaft I6 Surrounding the shaft 1 is a tubular shaft I6 which is spaced from the shaft 1 by means of bearing rings l1 and I8 which are fast to one shaft and freely. rotatable on the other shaft.
  • the shaft i6 is provided with a clutch housing lit to which is attached, by means of screws 20, a worm gear 2
  • This chain of driving means is enclosed in a sub-housing comprising two caps 2'! and 28.
  • the tubular shaft i6 is journaied in the housing 3 by means of ball bearings 29 and 30.
  • clutchrings 34 and 36 Disposed within the housing [9 are clutchrings 34 and 36 which are pressed together by a coil spring 3i extending between the collars 32 and 33, recurrent plates 34 being provided with external lugs extending into a keyway 35 so that these plates must rotate with the housing and one or more of the intermediate plates 36 being provided with internal lugs extending into a keyway 31 so that these plates are non-rotatabiy associated with the shaft 1. Between the plates of the two sets are friction rings 38.
  • comprises a tubular screw 40 surrounding the shaft 1 and threading through a bushing 41 mounted in a portion 42 of the housing 3, the screw being spaced from the portion 9 of the shaft I by means of a sleeve 43.
  • a thrust bearing 44 is integrally connected with the screw 40.
  • a gear wheel 45 is integrally connected with the screw 40 to which is attached, by means of screws 46 (Fig. 2), a ratchet wheel 41.
  • a sleeve 48 Surrounding the portion III of shaft 1 is a sleeve 48 carrying two integral arms 49 and 50.
  • Pivotally mounted on the outer end of the arm 49 is a pawl 5
  • Rotatably mounted on the outer end of the arm 50 is a roller 55 engageable with a cam 68 on the shaft II, this shaft being driven by a worm gear 58 meshing with a worm as on the portion ll of the shaft 1.
  • a spring 60 yieldingly holds the roller II in contact with the cam 58.
  • a pinion H is mounted on shaft 62 which extends outwardly through the casing 54 to a hand wheel Iii.
  • the shaft 62 is pushed inwardly until the pinion 6
  • the reel 5 is driven through the following train of mechanism: shaft 24 (Fig. 4), worm 25, gear 24, shaft 23, worm 22, gear- 2
  • shaft 1 rotates it causes the pawl 5
  • the pawl oscillates back and forth once for each revolution of the shaft 51.
  • the number of revolutions of the shaft 1 per oscillation of pawl ll may be in any desired ratio depending upon-the gear ratio of worm II and.
  • cinematographic apparatus for driving a film take-up reel, comprising a shaft for rotating the reel, a tubular rotor surrounding a portion of the shaft, a friction clutch surrounding the shaft at the end of the tubular rotor with friction surfaces non-rotatably associated with the shaft and rotor respectively, a tubular screw surrounding said shaft on the side of the clutch opposite the rotor, a compression spring between the clutch and screw for pressing said friction surfaces together, and means driven by said shaft for turning the screw to increase the tension of the spring in proportion to the increase in diameter of the roll of film on the take-up reel,

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Winding Of Webs (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
US276567A 1939-05-31 1939-05-31 Cinematographic apparatus Expired - Lifetime US2241689A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US276567A US2241689A (en) 1939-05-31 1939-05-31 Cinematographic apparatus
GB4618/40A GB536356A (en) 1939-05-31 1940-03-12 Improvements in cinematographic apparatus
FR864676D FR864676A (fr) 1939-05-31 1940-04-06 Appareil cinématographique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US276567A US2241689A (en) 1939-05-31 1939-05-31 Cinematographic apparatus

Publications (1)

Publication Number Publication Date
US2241689A true US2241689A (en) 1941-05-13

Family

ID=23057151

Family Applications (1)

Application Number Title Priority Date Filing Date
US276567A Expired - Lifetime US2241689A (en) 1939-05-31 1939-05-31 Cinematographic apparatus

Country Status (3)

Country Link
US (1) US2241689A (fr)
FR (1) FR864676A (fr)
GB (1) GB536356A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857750A (en) * 1956-05-01 1958-10-28 Carl E Fox Safety clutch
US3091951A (en) * 1961-06-16 1963-06-04 Onyskin Alexander Slip clutch
US3831883A (en) * 1972-10-03 1974-08-27 Eastman Kodak Co Reel driving device for a web transporting apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857750A (en) * 1956-05-01 1958-10-28 Carl E Fox Safety clutch
US3091951A (en) * 1961-06-16 1963-06-04 Onyskin Alexander Slip clutch
US3831883A (en) * 1972-10-03 1974-08-27 Eastman Kodak Co Reel driving device for a web transporting apparatus

Also Published As

Publication number Publication date
FR864676A (fr) 1941-05-02
GB536356A (en) 1941-05-12

Similar Documents

Publication Publication Date Title
US2063799A (en) Spring motor
US2909935A (en) Drive mechanism
US3104850A (en) Free spool casting reel
US2241689A (en) Cinematographic apparatus
US2718361A (en) Film reel mounting and drive for motion picture projectors
US2343850A (en) Projector control
US1377112A (en) Gove s
US2257172A (en) Winding and unwinding apparatus
US3061219A (en) Projector
US2251772A (en) Reel drive
GB1236959A (en) Improvements in and relating to cameras
US2364047A (en) Line reeling device
US1744773A (en) Photographic apparatus
US3371883A (en) Tape rewind
US2310947A (en) Automatic take-up device
US3137366A (en) Winding mechanism
US4265412A (en) Film wind-up device for a camera
US2592285A (en) Film transport means for motionpicture projectors
US2360294A (en) Reel drive mechanism for motion picture projectors
GB1162894A (en) A Slip Winder for a Camera
US2997899A (en) Spindle drive for a motion picture film take-up reel
US2009847A (en) Intermittent mechanism
US3166264A (en) Electrical drive for motion picture cameras
US2305360A (en) Fishing reel
US1152989A (en) Motion-picture device.