US3074310A - Film projector film gate - Google Patents

Film projector film gate Download PDF

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Publication number
US3074310A
US3074310A US823379A US82337959A US3074310A US 3074310 A US3074310 A US 3074310A US 823379 A US823379 A US 823379A US 82337959 A US82337959 A US 82337959A US 3074310 A US3074310 A US 3074310A
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US
United States
Prior art keywords
film
guide elements
aperture
resilient force
discs
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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
US823379A
Inventor
Kotte Jan Jacob
Netten Erik
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Philips North America LLC
US Philips Corp
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US Philips Corp
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Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3074310A publication Critical patent/US3074310A/en
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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
    • G03B1/00—Film strip handling
    • G03B1/56—Threading; Loop forming
    • 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
    • G03B21/44—Mechanisms transmitting motion to film-strip feed; Mechanical linking of shutter and intermittent feed
    • G03B21/46—Mechanisms transmitting motion to film-strip feed; Mechanical linking of shutter and intermittent feed affording adjustment for framing

Definitions

  • the present invention relates to a device used in film projectors and more particularly to a guide arrangement for the film strip in the area of the film gate.
  • the guide elements are fixedly rranged on one side of the film in order to obtain a fixed point of orientation of the film with respect to the projection aperture.
  • the film guide elements are also resiliently arranged on both sides of the film, but are subject to a spring pressure higher on one side than that on the other side thereof.
  • the structure according to the invention allords the advantage that the guide elements which are subject to a higher spring pressure do not change their positions during operation, so that the film still has a fixed point of orientation with respect to the projection aperture, while the structure, the securement and the arrangement of the guide elements may be wholly identical, thus enabling the guide elements to be changed in a simple man ner and also interchanged.
  • Another object of the present invention is to provide guide elements comprising apertured discs which are urged against the film or, in the absence of a film, against fixed stops by means of resiliently arranged pins having their pointed ends extending in part into the holes of the discs.
  • the resiliently arranged pins maintain the guide discs in their mounted positions.
  • the discs may be removed from the device in a very simple manner by moving them against the spring pressure and they may either be replaced, if desired, or interchanged, or turned by 180 about a diametric axis and mounted again.
  • the discs, pins, springs and holders are preferably Wholly identical on each side of the film, the springs on one side of the film being subject to a tension greater than that on the other side of the film.
  • the present device illustrates a projection aperture 1 having a transverse guide means for the film comprising ceramic discs 2, 3, 4 and 5 which are urged against fixed stops 10, 11, 12 and 13 by means of resiliently mounted pins 6, 7, 8 and 9.
  • Discs of ceramic material have been found to be more resistant to wear.
  • the pointed extremities of the pins 6, '7, 8 and 9 extend into the central apertures of the discs.
  • the pins 6, 7, 8 and 9 are hollow, and accommodate coil springs, only the two upper ones i -l, 15 being visible in the drawing.
  • the figure shows that the spring 14 is subject to a higher tension than applied to spring 15. It is thus ensured that after a film has been inserted in the guide means that the 3,074,310 Patented Jan.
  • discs 2 and d are maintained in engagement with the fixed stops i0 and 12 so that these discs fulfil the function of fixed stops for the film.
  • the discs 3 and 5 on the other hand may be moved by the film away from their fixed stops i1 and 13 against the action of the springs under low tension.
  • the discs 2, 3, 4, and 5, the pins 6, 7, 8 and 9, the springs 1 and 1.5 and the structure of the holders l6 and 17 are identical. This, of course, offers the advantage of interchangeability of the parts.
  • a film device having a film track with a projection aperture comprising a plurality of guide elements acting on the edges of the film to be guided, means resiliently mounting said guide elements on each side of said projection aperture, the resilient force acting against the guide elements in the direction of the film width and being greater on one side of said film aperture than the resilient force acting against the guide elements on the other side of said film aperture whereby the guide elements having the greater resilient force act as fixed stops for the film.
  • a film device having a film track with a projection aperture comprising a plurality of apertured guide elements, means resiliently mounting said guide elements on each side of said projection aperture, the resilient force acting against the guide elements on one side of said film aperture being greater than the resilient force acting against the guide elements on the other side of said guide aperture, said resilient mounting means for said guide elements including a plurality of pins, spring means urging said pins against said guide elements, one end of each pin extending through at least part of the aperture of the associated guide element.
  • a film device having a film track with a projection aperture comprising a plurality of guide elements each including a ceramic disc having a centrally located aperture, means resiliently mounting said guide elements on each side of said projection aperture, the resilient force acting against the guide elements on one side of said film aperture being greater than the resilient force acting against the guide elements on the other side of said film aperture whereby the guide elements having the greater resilient force act as fixed stops for the film.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Projection-Type Copiers In General (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Advancing Webs (AREA)
  • Photographic Developing Apparatuses (AREA)

Description

Jan. 22, 1963 J. J. KOTTE ETAL 3,074,310 FILM PROJECTOR FILM GATE Filed June 29, 1959 l u 3 i7 44 -e 7 Q as INVENTORS JAN JACOB KOTTE ERIK NETTEN United States Patent ()fiice 3,074,310 FILM ERGJECTGR FKLM GATE Jan Jacob Kotte and Erik Netten, Eindhoven, Netherlands, assignors to North American Philips (Company, Inc., New York, N.Y., a corporation of Delaware Fiied June 29, 1959, Ser. No. 823,379 Claims priority, application Netherlands Aug. 14, 1953 4 Ciaims. (til. 83-17) The present invention relates to a device used in film projectors and more particularly to a guide arrangement for the film strip in the area of the film gate.
In known structures of the above-mentioned kind, the guide elements are fixedly rranged on one side of the film in order to obtain a fixed point of orientation of the film with respect to the projection aperture.
According to the teachings of the invention however, the film guide elements are also resiliently arranged on both sides of the film, but are subject to a spring pressure higher on one side than that on the other side thereof.
The structure according to the invention allords the advantage that the guide elements which are subject to a higher spring pressure do not change their positions during operation, so that the film still has a fixed point of orientation with respect to the projection aperture, while the structure, the securement and the arrangement of the guide elements may be wholly identical, thus enabling the guide elements to be changed in a simple man ner and also interchanged.
Another object of the present invention is to provide guide elements comprising apertured discs which are urged against the film or, in the absence of a film, against fixed stops by means of resiliently arranged pins having their pointed ends extending in part into the holes of the discs.
The resiliently arranged pins maintain the guide discs in their mounted positions. The discs may be removed from the device in a very simple manner by moving them against the spring pressure and they may either be replaced, if desired, or interchanged, or turned by 180 about a diametric axis and mounted again.
According to a further feature or" the invention, the discs, pins, springs and holders are preferably Wholly identical on each side of the film, the springs on one side of the film being subject to a tension greater than that on the other side of the film.
In order that the invention may be readily carried into efiect, one embodiment thereof will now be described in detail by way of example, with reference to the accompanying drawing, in which the sole figure is a front elevation view of a film track according to the invention.
Referring to the drawing, the present device illustrates a projection aperture 1 having a transverse guide means for the film comprising ceramic discs 2, 3, 4 and 5 which are urged against fixed stops 10, 11, 12 and 13 by means of resiliently mounted pins 6, 7, 8 and 9. Discs of ceramic material have been found to be more resistant to wear. The pointed extremities of the pins 6, '7, 8 and 9 extend into the central apertures of the discs. The pins 6, 7, 8 and 9 are hollow, and accommodate coil springs, only the two upper ones i -l, 15 being visible in the drawing. The figure shows that the spring 14 is subject to a higher tension than applied to spring 15. It is thus ensured that after a film has been inserted in the guide means that the 3,074,310 Patented Jan. 22, 1963 discs 2 and d are maintained in engagement with the fixed stops i0 and 12 so that these discs fulfil the function of fixed stops for the film. The discs 3 and 5 on the other hand may be moved by the film away from their fixed stops i1 and 13 against the action of the springs under low tension. The discs 2, 3, 4, and 5, the pins 6, 7, 8 and 9, the springs 1 and 1.5 and the structure of the holders l6 and 17 are identical. This, of course, offers the advantage of interchangeability of the parts.
What is claimed is:
l. A film device having a film track with a projection aperture comprising a plurality of guide elements acting on the edges of the film to be guided, means resiliently mounting said guide elements on each side of said projection aperture, the resilient force acting against the guide elements in the direction of the film width and being greater on one side of said film aperture than the resilient force acting against the guide elements on the other side of said film aperture whereby the guide elements having the greater resilient force act as fixed stops for the film.
2. A film device having a film track with a projection aperture comprising a plurality of apertured guide elements, means resiliently mounting said guide elements on each side of said projection aperture, the resilient force acting against the guide elements on one side of said film aperture being greater than the resilient force acting against the guide elements on the other side of said guide aperture, said resilient mounting means for said guide elements including a plurality of pins, spring means urging said pins against said guide elements, one end of each pin extending through at least part of the aperture of the associated guide element.
3. A film device as claimed in claim 2 wherein said pins, springs and guide elements are identical, the springs on one side of said projection aperture being compressed to a greater extent than the springs on the other side of said aperture.
4. A film device having a film track with a projection aperture comprising a plurality of guide elements each including a ceramic disc having a centrally located aperture, means resiliently mounting said guide elements on each side of said projection aperture, the resilient force acting against the guide elements on one side of said film aperture being greater than the resilient force acting against the guide elements on the other side of said film aperture whereby the guide elements having the greater resilient force act as fixed stops for the film.
References Cited in the file of this patent UNITED STATES PATENTS 1,437,895 Horst Dec. 5, 1922 1,781,945 Case Nov. 18, 1930 1,854,004 Tschopp Apr. 12, 1932 2,002,074 Bassoon May 21, 1935 2,120,249 Holman June 14, 1938 2,142,606 Debrie Jan. 3, 1939 2,368,634 Boecking Feb. 6, 1945 2,534,732 Perillo Dec. 19, 1950 FOREIGN PATENTS 537,406 Germany Nov. 2, 1931 532,658 Germany Aug. 21, 1933

Claims (1)

1. A FILM DEVICE HAVING A FILM TRACK WITH A PROJECTION APERTURE COMPRISING A PLURALITY OF GUIDE ELEMENTS ACTING ON THE EDGES OF THE FILM TO BE GUIDED, MEANS RESILIENTLY MOUNTING SAID GUIDE ELEMENTS ON EACH SIDE OF SAID PROJECTION APERTURE, THE RESILIENT FORCE ACTING AGAINST THE GUIDE ELEMENTS IN THE DIRECTION OF THE FILM WIDTH AND BEING GREATER ON ONE SIDE OF SAID FILM APERTURE THAN THE RESILIENT FORCE ACTING AGAINST THE GUIDE ELEMENTS ON THE OTHER SIDE OF SAID FILM APERTURE WHEREBY THE GUIDE ELEMENTS HAVING THE GREATER RESILIENT FORCE ACT AS FIXED STOPS FOR THE FILM.
US823379A 1958-08-14 1959-06-29 Film projector film gate Expired - Lifetime US3074310A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL230922 1958-08-14

Publications (1)

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US3074310A true US3074310A (en) 1963-01-22

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US823379A Expired - Lifetime US3074310A (en) 1958-08-14 1959-06-29 Film projector film gate
US823613A Expired - Lifetime US3045538A (en) 1958-08-14 1959-06-29 Film guide for film projector

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CH (2) CH376364A (en)
DE (2) DE1117384B (en)
GB (1) GB921932A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944122A (en) * 1972-12-29 1976-03-16 Honeywell Information Systems Italia Device for guiding the magnetic tape in magnetic tape handling apparatus
US5251844A (en) * 1990-12-17 1993-10-12 International Business Machines Corporation Gimbaled compliant guide for tape drivers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259291A (en) * 1962-07-27 1966-07-05 Mcgraw Hill Book Company Inc Motion picture projector with automatic edgewise film threading
CA2791499C (en) * 2011-09-30 2020-12-15 Charles Larsen Gate roller with tapered side walls, and related methods

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1437895A (en) * 1921-08-29 1922-12-05 Horst Ludwig Film gate
US1781945A (en) * 1928-03-14 1930-11-18 Case Res Lab Inc Talking-picture machine
DE537406C (en) * 1930-08-09 1931-11-02 Carl Neithold Akt Ges Enlargement device, the effective parts of which are arranged in an immovable distance in a light-tight box body
US1854004A (en) * 1927-07-26 1932-04-12 Gen Electric Film guide roller
DE582658C (en) * 1931-12-09 1933-08-21 Eumig Elek Zitaets Und Metallw Film guiding device
US2002074A (en) * 1931-01-14 1935-05-21 Joseph D Basson Film guiding mechanism
US2120249A (en) * 1934-12-14 1938-06-14 Arthur J Holman Sound and picture aperture unit and film feeding mechanism
US2142606A (en) * 1936-02-10 1939-01-03 Debrie Andre Leon Vict Clement Cinematographic apparatus
US2368634A (en) * 1941-05-31 1945-02-06 Century Projector Corp Lens mount and film gate construction for motion-picture projection machines
US2534732A (en) * 1949-04-26 1950-12-19 Viewlex Inc Film guide for stripfilm projectors

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT99376B (en) * 1923-03-23 1925-03-10 Aeg Union Elek Wien Film tape guide.
US1815486A (en) * 1924-10-29 1931-07-21 Serrurier Iwan Film viewing machine
US2192641A (en) * 1936-08-07 1940-03-05 Int Projector Corp Motion picture apparatus
FR819821A (en) * 1937-03-27 1937-10-27 Further training in cinematographic projection equipment
US2192692A (en) * 1937-09-13 1940-03-05 Zeiss Ikon Ag Camera
US2199305A (en) * 1939-05-23 1940-04-30 Dewey Edward Bradley Negative holder for photographic printers, enlargers, or the like
US2431681A (en) * 1945-06-23 1947-12-02 Argus Inc Movable tension shoe
DE840187C (en) * 1948-05-07 1952-05-29 Tech Et Ind Appliquees Soc Et Film guide channel for the exposure window in cinematographic apparatus
FR1073649A (en) * 1953-01-30 1954-09-28 Device for transforming cinematographic projection devices

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1437895A (en) * 1921-08-29 1922-12-05 Horst Ludwig Film gate
US1854004A (en) * 1927-07-26 1932-04-12 Gen Electric Film guide roller
US1781945A (en) * 1928-03-14 1930-11-18 Case Res Lab Inc Talking-picture machine
DE537406C (en) * 1930-08-09 1931-11-02 Carl Neithold Akt Ges Enlargement device, the effective parts of which are arranged in an immovable distance in a light-tight box body
US2002074A (en) * 1931-01-14 1935-05-21 Joseph D Basson Film guiding mechanism
DE582658C (en) * 1931-12-09 1933-08-21 Eumig Elek Zitaets Und Metallw Film guiding device
US2120249A (en) * 1934-12-14 1938-06-14 Arthur J Holman Sound and picture aperture unit and film feeding mechanism
US2142606A (en) * 1936-02-10 1939-01-03 Debrie Andre Leon Vict Clement Cinematographic apparatus
US2368634A (en) * 1941-05-31 1945-02-06 Century Projector Corp Lens mount and film gate construction for motion-picture projection machines
US2534732A (en) * 1949-04-26 1950-12-19 Viewlex Inc Film guide for stripfilm projectors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944122A (en) * 1972-12-29 1976-03-16 Honeywell Information Systems Italia Device for guiding the magnetic tape in magnetic tape handling apparatus
US5251844A (en) * 1990-12-17 1993-10-12 International Business Machines Corporation Gimbaled compliant guide for tape drivers

Also Published As

Publication number Publication date
CH376364A (en) 1964-03-31
DE1117384B (en) 1961-11-16
GB921932A (en) 1963-03-27
CH372919A (en) 1963-10-31
US3045538A (en) 1962-07-24
DE1174152B (en) 1964-07-16

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