US3700188A - Flex-snubber - Google Patents

Flex-snubber Download PDF

Info

Publication number
US3700188A
US3700188A US201825A US3700188DA US3700188A US 3700188 A US3700188 A US 3700188A US 201825 A US201825 A US 201825A US 3700188D A US3700188D A US 3700188DA US 3700188 A US3700188 A US 3700188A
Authority
US
United States
Prior art keywords
cartridge
snubber
stem
path
film
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
US201825A
Other languages
English (en)
Inventor
James C Bradford
Stephen H Miller
Jeffrey C Robertson
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of US3700188A publication Critical patent/US3700188A/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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/26—Holders for containing light sensitive material and adapted to be inserted within the camera
    • G03B17/265—Holders for containing light sensitive material and adapted to be inserted within the camera specially adapted for motion picture film, e.g. cassettes

Definitions

  • FLEX-SNUBBER [72] lnventors; James C. Bradford; Stephen H.
  • a frusto -con-ical snubber is mounted on a resilient, deflectable stem and is positioned along a film path in the cartridge.
  • the snubber As the film is intermittently advanced through the cartridge in contact with thesnubber, the snubber is resiliently deflected to increase the surface area of the snubber engaged by the film.
  • the deflection of the snubber and the increased frictional forces between the film and snubber resulting therefrom dampen variations in tension forces along the film permitting more accurate registration of the film for recording of images thereon 11 Claims, 4 Drawing Figures PATENTEDucI 241912 3. 700. 188
  • This invention relates to guide means for controlling and directing flexible strip material. More specifically, this invention relates to a resilient flex-snubber for a flexible strip of recording material (such as film) in a cartridge.
  • Cartridges for use in cinematographic and other recording apparatus are generally well known in the art.
  • such cartridges provide for movement of a tape or strip of recording material along a predeten mined path leading from a supply chamber to arecording or reproduction aperture, and then into a take-up chamber.
  • Accurately controlled movement of the strip along such a path, especially in the region of the recording or reproduction aperture, is essential to assure desired registration characteristics.
  • snubber To smooth undesired movement of a strip material, it is known in the art to provide what is commonly referred to genericallyas a snubber.
  • the term snubber has been used in reference to almost any surface which contacts a strip material to reduce sudden surging movements, suppress undesired movement or otherwise smooth the movement of the strip.
  • Prior art snubbers are of a variety of constructions depending upon the ultimate purpose they are to fulfill.
  • One type of snubber known to the art is illustrated in commonly assigned US. Pat. No. 3,208,686 issued Sept. 28, 1965, in the name of E. A. Edwards et al. which shows a fixed snubbing surface that is effective to guide a flexible film strip.
  • fixed snubbing surfaces may be generally cylindrical or cylindrical with a conical extension and cooperate with other cartridge elements to compensate for different types of movement imparted to the filmstrip along the film path.
  • the snubbing surfaces as disclosed in that patent control film guiding and film tension for smooth movement of the film during operation of the cartridge.
  • a cartridge of the type generally disclosed by the aforementioned Edwards et al patent such being commonly referred to as a super 8 cartridge.
  • a film advancing claw in the camera can intermittently engage the film and advance the film from a supply chamber in the cartridge along a film path and into an exposure aperture.
  • a take-up drive in the camera rotates the core of the take-up reel to wind the film in a cartridge take-up chamber which is coaxial with the supply chamber.
  • the Tucker patent discloses a generally cylindrical roller which freely rotates about the axis of a post, the snubber serving not only to guide a film strip but also to snub undesired erratic motion that may be transmitted along the length of the film strip due to intermittant operations affecting the movement of the strip material.
  • the rotatable snubber is effective where low frictional forces are desired and/or where the strip material is directed along an abruptly curved path.
  • This type of snubber is also shown at 48 in the Edwards et al. patent.
  • Rotatable guide members having surface shapes other than cylindrical are also known as disclosed, for example, in US. Pat. No. 3,334,835 issued to Keezi Kaneko on Aug. 8, 1967.
  • movable snubber is one having a contact surfa e positioned along the path of the strip material and resiliently biased toward the strip.
  • snubbers of this type may be generally described as having flat or cylindrical contact surfaces which are supported by resilient means. See, for example, U.S. Pat. No. 2,163,179 iscreated by such thin films, it is desirable to modify such cartridges in a way which will make them suitable for such film, and preferably in a way which will permit the cartridges to be loaded with more conventional films having greater thickness (e.g., about 4 to 5 mils thick).
  • Another object of the invention is to provide a'cartridge in which forces created in a strip material by intermittent movement may be dampened, thereby resulting in smoothed movement of the strip material.
  • a further object of the invention is to provide a flexsnubber for use with a film strip for reducing undesired surges in tension in the strip due to intermittent advancing of the film strip at normal filming rates.
  • Still another object of the invention is to provide a flex-snubber for dampening surges in a strip by increasing the surface area of the flex-snubber that contacts the strip surface when the strip material exerts a force sufficient to deflect the flex-snubber.
  • a flexsnubber is placed in a cartridge for film or the like.
  • the flex-snubber has a frusto-conical member and a resilient, flexible stem extending from the member.
  • the end of the stem remote from the member is connected to the cartridge for resiliently mounting the surface of the frusto-conical member so that it -is engageable by the strip material.
  • the stem is deflectable in response to tension forces in the material from l a first condition wherein a first surface area of the member is contacted by the material toward (2 a second condition wherein a second surface area is contacted by said material.
  • the stem when flexed by the tension forces in the strip, exerts a biasing force urging the member from its second condition toward its first condition.
  • the biasing force of the stem and change in friction forces between the material and the surface of the member dampen the tension forces and smooth the movement of the material relative to the cartridge.
  • FIG. 1 is a perspective view, partially broken away, of a preferred embodiment of a flex-snubber according to the invention and illustrating the position of the flexsnubber in a motion picture cartridge;
  • FIG. 2 is' an enlarged, fragmentary side view of the FIG. 1 flex-snubber, showing a position of the flexsnubber relative to the cartridge and film (shown in phantom) when the film and the flex-snubber are at a normal rest position;
  • FIG. 3 is a view similar to FIG. 2 but showing the position of the flex-snubber relative to the cartridge and film when the film is under tension force and the flex-snubber is substantially fully deflected;
  • FIG. 4 is a fragmentary, sectional view taken along line 44 of FIG. 2.
  • the present invention relates to an improvement in film cartridges such as disclosed in the aforementioned commonly-assigned US. Pat No. 3,208,686, issued Sept. 28, 1965, in the name of Edwards et al. Accordingly, the complete disclosure in that patent is incorporated herein by reference.
  • numerals less than 100 are used to identify the same or similar parts disclosed in the Edwards et al. patent, and numerals greater than 100 are used to identify features not disclosed therein.
  • FIG. 1 shows a film cartridge generally designated which is generally of the type disclosed by Edwards et al.
  • Cartridge 10 comprises a body 12 and a cover 14.
  • Body 12 includes a cylindrical film supply chamber 28 and a cylindrical take-up chamber (not shown) separated by a wall 32.
  • the chambers are at opposite sides of the body substantially in coaxial alignment with each other.
  • a stationary locating boss or post 36 is formed integral with wall 32 substantially at its center and projects into supply chamber 28.
  • a coreless roll or coil 44 of film strip 46 is placed in supply chamber 28 coaxial to a boss 36 such that one spirally wound edge lies against the flat tray portion of an anti-friction disk (not shown) that rests on wall 32.
  • the other spirally wound edge of the roll lies in a plane substantially parallel to and closely adjacent to the inner surface of wall 20 of the cover 14.
  • Film strip 46 as it is tangentially unwound from roll 44 and withdrawn from chamber 28, is threaded around aflex-snubber 148 of this invention and then along a film path which brings the film into registry with an exposure aperture 24 in wall 22.
  • Suitable guide means in the cartridge including guide members 150a and 150b, define the path for film through the cartridge.
  • film strip 46 is then guided into the take-up chamber where it is wound upon a take-up core (not shown).
  • flex-snubber 148 comprises a hollow head portion 149 having an exterior frusto-conical contact surface 151.
  • surface 151 has a relatively large end portion 151a (the top portion in FIGS. 2 and 3) and a relatively smaller end portion 151b.
  • the head portion is supported by and preferably integral with a resiliently flexible stem portion 153.
  • the stem portion projects from the center of the hollow head portion to form an annular recess 155 in the head portion.
  • Stem portion 153 is anchored securely to a support boss 157 extending from wall 32 (as shown) or stem portion 153 can be secured to wall 32 directly. In either case, the stem portion is non-rotatably supported by the cartridge.
  • This mounting fixes the stem portion axially and therefore normally maintains surface 151 angularly inclined to the film path, and also provides the desired resiliency or flexing of the stem in response to tension forces in the film portions adjacent the snubber as described in more detail later.
  • Flex-snubber 148 is so structured that the portion 151a of the frusto-conical surface having the larger dimension is at the end thereof opposite from the end of the stem portion that projects from the head portion, i.e., it is opposed to where stem portion 153 is attached to base 157. This provides a desirable snubbing effect upon film 46 which is curved around the frusto-conical contact surface 151 as explained in more detail later.
  • film 46 When film 46 is not under tension and flex-snubber 148 is in a normal rest position (FIGS. 1, 2 and 4), film 46 engages only part of the portion 151a of contact sur' face 149, i.e., along a line or band at the upper edge of the head portion. As shown in FIG. 2, surface portion 1510 is so positioned relative to film 46 that one side edge of the film contacts surface portion 151a.
  • Impulses or surges in tension imparted to the film strip 46 by the pull-down claw causes deflection of flex-snubber 148 toward its FIG. 3 position and are at least partially absorbed by the deflection of the snubber. Also, the deflection of the snubber results in increased frictional surface contact area between the film and the snubber due to the frusto-conical shape of the snubber surface 151 and its position with respect to the film path. This friction and the flexing of the snubber dampens the tension forces in the film strip and causes the supply roll to experience a more uniform force and unwind more smoothly.
  • the friction between the film and the snubber is one factor affecting performance of the snubber.
  • a snubber molded from polyurethane materials has been found satisfactory.
  • the entire contact surface 151 is generally frusto-c'onical in shape in order to simplify manufacture of the snubber and its assembly into the cartridge.
  • the invention has been particularly described I with reference to a film cartridge, the invention may I also be used in other flexible strip handling apparatus wherein a web is moved from a supply means to a takeup means.
  • a cartridge for flexible strip material comprising:
  • a snubber surface located along the path and engageable by strip material in the cartridge as such material is moved relative to the cartridge;
  • a cartridge as set forth in claim 3 wherein said snubber surface is substantially frusto-conical in shape.
  • said mounting means comprises a flexible stem nonrotatably supported by one of said walls, said stem being substantially coaxial with said frusto-conical surface when said surface is in its first condition, said stern being flexed in response to tension forces acting against said surface to permit said surface to move from its first condition toward its second condition, and said stem urging said surface from its second condition toward its first condition.
  • a cartridge for flexible strip material comprising:
  • a snubber comprising a member having a frusto-conical surface located along the path so that the surface is engageable by strip material in the cartridge as such material is moved relative to the path;
  • a resilient stem non-rotatably secured to said member and substantially coaxial therewith, the stem being non-rotatably secured to one of said walls so that said stem is flexed in response to tension forces in the material to permit said surface to move from (1) a first condition wherein a relatively small first area of said surface is contacted by said material toward (2) a second condition wherein a relatively large second area of said surface is contacted by said material, and said stem when flexed exerting a biasing force urging said surface from its second condition toward its first condition, whereby the biasing force and increased friction between the material and the surface serves to dampen tension forces applied to the strip material and smooth movement of said strip material relative to the cartridge.
  • a cartridge for flexible strip material said cartridge comprising a plurality of walls and means defining a path for said flexible strip material between portions of the cartridge, the improvement comprising:
  • snubber means comprising a member having a frusto-conical shaped surface positioned along the path;
  • a resilient stem secured to said member and supported by one of said walls, whereby the stem can flex when strip material is drawn against said surface so that surges of tension forces in said strip material are dampened and movement of the strip material along the path is dampened.
  • a cartridge for use in cinematographic apparatus said cartridge comprising a plurality of walls defining a take-up chamber and a supply chamber for a roll of flexible film, said cartridge having means defining a path for the film leading from said supply chamber toward said take-up chamber, the improvement comprising:
  • said guide means for directing said film along said path, said guide means comprising a frustoconical shaped member and a flexible stern fixedly secured to said member and to one of said walls 0 the cartridge.
  • a flexible stem is secured to said one of said walls so that the portion of the surface of said frusto-comcal member which is along said path can be deflected between a first position wherein the surface is inclined relative to the path and a second position wherein such portion of said frusto-conical member is substantially aligned with said path.
  • a frusto-conical member having a relatively small end portion and a relatively large end portion; and a resilient stern integral with and extending from said small end portion of said frusto-conical member, a portion of said stem remote from said member being connectable to a cartridge, whereby the snubber can be deflected when subjected to a force applied to the surface of said frusto-conical member.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Cameras Including Film Mechanisms (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Unwinding Webs (AREA)
US201825A 1971-11-24 1971-11-24 Flex-snubber Expired - Lifetime US3700188A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20182571A 1971-11-24 1971-11-24

Publications (1)

Publication Number Publication Date
US3700188A true US3700188A (en) 1972-10-24

Family

ID=22747460

Family Applications (1)

Application Number Title Priority Date Filing Date
US201825A Expired - Lifetime US3700188A (en) 1971-11-24 1971-11-24 Flex-snubber

Country Status (5)

Country Link
US (1) US3700188A (enExample)
DE (1) DE7243015U (enExample)
FR (1) FR2162993A5 (enExample)
GB (1) GB1359240A (enExample)
MY (1) MY7500013A (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893757A (en) * 1973-06-01 1975-07-08 Avom Inc Sound-and-picture-on-film reproducing system
US3972485A (en) * 1975-01-09 1976-08-03 Technicolor Corporation Endless-roll film cartridge
WO1984002585A1 (en) * 1982-12-23 1984-07-05 Carmel James H Panoramic motion picture camera and method
US4754875A (en) * 1985-08-31 1988-07-05 Agfa-Gevaert Ag Roll film magazine frame for supporting film receiving film spool and using in a reading device
US5465134A (en) * 1994-02-16 1995-11-07 Eastman Kodak Company Passive film take-up chamber
US5730378A (en) * 1995-08-25 1998-03-24 Eastman Kodak Company Filmstrip take-up chamber

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001440A (en) * 1957-02-18 1961-09-26 Edwin E Foster Film magazine
US3208686A (en) * 1963-12-30 1965-09-28 Eastman Kodak Co Film cartridge
US3263936A (en) * 1962-11-30 1966-08-02 Constance & Williams Ltd Tape cassette
US3312412A (en) * 1964-02-17 1967-04-04 Bell & Howell Co Film container
US3334835A (en) * 1964-11-27 1967-08-08 Fuji Photo Film Co Ltd Film magazine for a movie camera
US3424391A (en) * 1967-02-23 1969-01-28 Burroughs Corp Free-positioning alignment bobbin

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001440A (en) * 1957-02-18 1961-09-26 Edwin E Foster Film magazine
US3263936A (en) * 1962-11-30 1966-08-02 Constance & Williams Ltd Tape cassette
US3208686A (en) * 1963-12-30 1965-09-28 Eastman Kodak Co Film cartridge
US3312412A (en) * 1964-02-17 1967-04-04 Bell & Howell Co Film container
US3334835A (en) * 1964-11-27 1967-08-08 Fuji Photo Film Co Ltd Film magazine for a movie camera
US3424391A (en) * 1967-02-23 1969-01-28 Burroughs Corp Free-positioning alignment bobbin

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893757A (en) * 1973-06-01 1975-07-08 Avom Inc Sound-and-picture-on-film reproducing system
US3972485A (en) * 1975-01-09 1976-08-03 Technicolor Corporation Endless-roll film cartridge
WO1984002585A1 (en) * 1982-12-23 1984-07-05 Carmel James H Panoramic motion picture camera and method
US4754875A (en) * 1985-08-31 1988-07-05 Agfa-Gevaert Ag Roll film magazine frame for supporting film receiving film spool and using in a reading device
US5465134A (en) * 1994-02-16 1995-11-07 Eastman Kodak Company Passive film take-up chamber
US5730378A (en) * 1995-08-25 1998-03-24 Eastman Kodak Company Filmstrip take-up chamber

Also Published As

Publication number Publication date
GB1359240A (en) 1974-07-10
MY7500013A (en) 1975-12-31
DE7243015U (de) 1973-02-15
FR2162993A5 (enExample) 1973-07-20
DE2257395A1 (de) 1973-05-30
DE2257395B2 (enExample) 1975-09-25

Similar Documents

Publication Publication Date Title
US3208686A (en) Film cartridge
US3008661A (en) Antisnubber arrangement for film handling apparatus
US3700188A (en) Flex-snubber
US3057573A (en) Take-up chamber for photographic film
US3712558A (en) Take-up device for a strip of web material
US3718301A (en) Filmstrip cartridge
US3860195A (en) Disabling device for an anti-backup mechanism in a film cartridge
US3724776A (en) Film feeding apparatus
US3550880A (en) Film stripping mechanism
US3001440A (en) Film magazine
US3606192A (en) Automatic takeup mechanism for strip material
US2568339A (en) Film advancing means for film magazines
US3488016A (en) Cassette for a spool bearing a magnetic tape or cinematographic film
US3514194A (en) Movie film magazine for synchronous recording and reproducing
US3659804A (en) Web take-up device
US2159998A (en) Film holder for photographic cameras
US3208688A (en) Tape reel
US2173996A (en) Film-guiding mechanism
US3544040A (en) Take-up threading improvement for automatic strip handling device
US3233839A (en) Film threader apparatus
US3900169A (en) Film cartridge
US2838304A (en) Film projector
US3549106A (en) Projector take-up mechanism
US3923520A (en) Film strip cassette with moving processing fluid doctoring surface
US3767132A (en) Device for winding a filmstrip