US1900681A - Method of reenforcing cinematograph films - Google Patents

Method of reenforcing cinematograph films Download PDF

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Publication number
US1900681A
US1900681A US409737A US40973729A US1900681A US 1900681 A US1900681 A US 1900681A US 409737 A US409737 A US 409737A US 40973729 A US40973729 A US 40973729A US 1900681 A US1900681 A US 1900681A
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strip
film
reenforcing
projections
perforations
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US409737A
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Arthur H Adams
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F LEO CRILLY
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F LEO CRILLY
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03DAPPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D15/00Apparatus for treating processed material

Description

March 7, 1933.

A. H. ADAMS METHOD OF REENFORCING ,CINEMATOGRAPH FILMS Filed Nov. 25, 1929 3 Sheets-Sheet l M m I INVENTOR 4:22.. 3 M

,L'ZZLM ATTORNEYS March 7, 1933. A, H. ADAMS METHOD OF REENFORCING CINEMATOGRAPH FILMS Filed Nov. 25 1929 3 Sheets-Sheet 2 INVENTOR w 2441* BY A ORNEY March 7, 1933. A. H. ADAMS 1,900,681

I METHOD OF REENFORCING CINEMATO'GRAPH FILMS Filed Nov. 25 1929 3 Sheets-Sheet 3 Patented Mar. 7, 1933 uurrao STATES lsaas sl PATENT orr ca am-nun 1r. mats, or vonxnas, NEW voax, assr'onon' "r r. mocmmm or LONDON, ENGLAND I IETKOD 0F REENFOBCII IG CINEMATOGRAPH FILMS Applicationfiled November 25, 1929. Serial 1T0. 409,787.

This invention relates to the art of reen-- forcing cinematograph film and has as an object the provision of suitable recnforcing strips secured along the edges of the film and the rovision of a method of securing said reen orcing strip to the film.

Other objects of the invention will be apparent to those skilled in the art from the followin' description. A preferred embodiment of the invention will now be described. reference being made to the accompanying drawings, wherein:

Figure 1 is a plan view of a reenforcing strip after the first operation has been performed;

Figure 2 is a longitudinal section taken on the line 2-2 of Figure 1;

Fi re 3 is a diagrammatic view of the reen orcing strip positioned in apparatus for performing the first operation on it;

F lgure 4 is a. plan view of the film strip after one series of apertures has been punched in it;

- Figure 5 shows apparatus for punching one series of apertures in the film;

Figure 6 shows apparatus for punching another series of apertures in the film;

Figure 7 is a p an view of the film with both series of apertures punched in it ready for assembly with the reenforcing strips.

Fi re 8 shows apparatus for assembling the m and reenforclng strip;

Figure 9 shows apparatus for piercing the pro'ection formed on the reenforcing strip; 1 igure 10 shows the position of apparatus.

after the piercingoper'ation has been completed; v

Figure 11 shows apparatus for turning the burrs formedby the piercing operation;

Figure 12 shows apparatus for clenching the burrs; Figure 13 shows the completed film and reen orcing strip; p

' Figure 14 is an enlarged bottom plan view .of the clenching burrs;

According to the preferred embodiment of the present invention, the film and the reenforcing strips are first prepared separately andiare thereafter assembled and secured togather. For convenience in description, the

-or even 2% may occur. This fact gives rise to a special problem when reenforcing with metal reenforcing strips as in the referred embodiment herein, for. obvious y, since metal does not shrink with age there will be a tendency (assuming equal lengths of metal strip and film to have'been originally secured together) for the metal to buckle slightly as film shrinkage occurs.

In order to minimize this tendency insofar as possible, it'is proposedbaccording to the I invention herein to assem Is the strips, and p the film in definite dimensional relationship based on the shrinkage factor of the film. If for every given unit of length of the film at the time of assembly a len h of reenforcing strip is selected which is s orter than the film but longer than the expected len h i of the film after shrinkage has occurre it will be apparent that when secured together in this relationship as shrinkage occurs the unit length of film will gradually approach the length of reenforcing strip, and then as; still more shrinkage occurs, will gradually become shorter than, the strip. In no case, however, will the discrepancy between the two unit lengths be as great as it would be if equal lengths of film and strip were amembled without regard to the shrinkage condition of thefilm. By proper selectionv of the no relationship in which the two are originally assembled the discrepancy can made very f small during the major portion of the useful life of the film.-

1% in two months but only 2% in a-year it will be apparent that if a unit of strip 1% or thereaboutsshorter thaii the film is assembled therewith, thedisc'r'epancy in length for the major portion of the year will be very sli ht.

or convenience, the distance between the center of the sprocket holes or perforations may be taken as unit lengths, these holes be ing punched in the film at standard distances during its manufacture. I

As the first step then in the preparation of the reenforcing strip, referring to Figure 1 and 3 the said strip maybe punched with preferably arranged in a row, close to the edge of the strip and outside the, row of; sprocket holes and their spacing being made with respect to the said holes. Thus, in the v preferred embodiment illustrated a projection is aligned transversely with the center of each sprocket hole and a second projection is spaced midway between the sprocket hole centers. I i J If desired, an additional set of projections may also be embossed in the strip, these projections being located inside the projections 4 and intended to secure the inside edge of the strip against displacement. Preferably the said projections are also located midway beit tween sprocket hole centers.

As illustrated in Figure 3 of the'drawings, punches 6 for forming the projections 4 and 5 may be associated with the punch 2 in proper relationship to provide t e desired spacing. And a spring-biased presser-foot 7 may be associatedwith the said punches in order to hold the work firmly 'while being punched. The projections which are formed in the strip are preferably in the form of small rounded domes as illustrated in Figures 2 and 9.

In the preparation of the film, it is desired to provide perforations suited to receive the projections 4 and 5 of the strip, said perforations to be located in the same relative posi tions with respect to the sprocket holes already punched as the projections occupy with respect to the sprocket holes in the strip, although due to the difference in unit lengths the absolute distances between perforations will be slightly different from the distances between projections.

For convenience (referring to Figures 4 and 5) the perforations 8 may be made first, after which (referring to Figures 6 and 7) the perforations 9 may be made. The ,perforations 8 are preferably located by reference to opposite edges of each sprocket hole.

area (Fi This may be conveniently accomplished by providing a pilot finger 10 having beveled aces 11 which'engage the ed of the sprocket holes and thus center the forthe punching operation. After being centered, the film may be held by the spring-biased m presser-foot 12 which holds the .film pnt il punched by the unch 13. Figure 4 shows the film strip after t e holes 8 have been punched.-

The perforations 9 are also preferably located by reference to'the edges of the sprocket holes, but instead of using opposite ed es of a single hole as previously described, ad acent edges of adjoining holes are used; pilot finger 14 (as seen in Figure 6 having inside beveled faces 15 is providedw ich centers the film by engaging edges 16, 16 of the sprocket holes. After the film is centered it may-be held by the spring-biased presser-foot 17 until punched by punches 18. n this manner it will be observed that the perforations 9 will be accurately located midway between the sprockethole centers. I

;After being thus prepared the strip and film are ready for assembly. For this purpose, as illustrated in Figure 8, the two strips are fed together in face-to-face relationship 1n such a manner that the projections embossed in the strip enter the perforations in the film successively. Aswillbe understood, althou h from the strip sufficiently smal to permit the projections to center themselves in the perforations when engaged successively, thus causing a slight buckling of the film between successive perforations. V 1

After assembly the projections are puncgures 9 and 10) byeneedle points 19 which pierce the metal and nd back burrs the film perforations are spaced different y pro ections, the difference is 20, the assembled film and strip being held meanwhile by the presser-foot 21.

Subsequently, the burrs 20 are bent outwardly by plunger 2 having beveled edges 23 and finally the burrs are flattened and ressed into the film by ressure plate 24 whic bends the outwardly ared burrs around the edges of the fihn perforations, thus firmly securing the two together.

What I claim is: p

1. The method of longitudinally reenforcing a cinematographic film strip with a metal strip, which comprises, centering the film strip on a sprocket hole and punching an aperture in line with the s rocket hole, centering the film strip on a jacent edgm of adjoining sprocket holes and punching an ap erture between the sprocket holes, punching projections on a reenforcing str1 corresponding to the apertures of said film strip and in the same operation punching sprocket holes in said reenforcing strip, assembling said'strips with said projections in said apertures, piercin said projections to form burrs, and brad ing said-burrs to secure said strips firmly together, substantially as set forth.

' said reenforcing strip being provided with sprocket holes mating with the sprocket holes of the film strip and rivet means securing said strips together at a plurality of points outside the line of said sprocket holes and at other points within the line of the sprocket holes.

4. The method of securing a reenforcing strip to a cinematographic film strip which comprises forming apertures on the film strip, forming dome-shaped projectionson said reenforcing strip, positioning said projections in said apertures, piercing said projections to form tubular burrs extending through said film strip, spreading said burrs by a conical die, and bradding said burrs by a flat die.

5. The method of preparing a cinematographic film strip for the assembly therewith of a reenforcing strip, which comprises, positioning said strip by a tapered member engaging the edges of a single sprocket hole, holdingthe strip by a spring biased presserfoot, and punching an aperture in the film in line with the hole while the strip is held by the presser foot.

6. The method of preparing a cinematographic film strip for the assembly therewith of a reenforcing strip, which comprises positioning said strip by a tapered memberv engaging the adjacent edges of adjoining sprocket holes, holding said strip by a spring biased presser-foot and punching apertures in said film intermediate said holes while the strip is held by the presser foot.

7. The method of preparing a reenforcing strip for a cinematographic film strip, which comprises holding said reenforcing strip by a spring-biased presser-foot and punching a sprocket hole and a plurality of dome- -shaped projections from said strip while so sequently turning the ends of said walls on,

the other side of the film strip to secure the reenforcing strip thereto.

9. As an article of manufacture, a flexible film strip reenforced by a flexible metal strip along its edge, said metal strip bein attached to said film strip by minute urrs punched out of the metal strip itself extend,-

is further characterized by the fact that the I rivets are located between each pair of sprocket holes.

12. The article as set forth in claim 9 which is further characterized by the fact that the rivets are located between each pair of sprocket holes, there being two rivets on the same transverse line, one near the outer edge of the strips and another near the inner 1ongitudinal edges of the sprocket holes.

13. As an article of manufacture, a film strip reenforced on its outer edges by a reenforcing strip secured thereto by small rivets between each sprocket hole, the rivets being so narrow longitudinall of the film strip as to permit free flexing o the. material between each pair of sprocket holes.

14. As an article of manufacture, a film strip reenforced on its side edges by a reenforcing strip which is secured thereto at frequent intervals by rivets, the rivets being much smaller than the sprocket holes of the strip to permit free flexing of the composite strip over a small radius as required in projection.

In testimony whereof, I have signed my name to this specification this 6th day of November 1929.

ARTHUR H. ADAMS.

US409737A 1929-11-25 1929-11-25 Method of reenforcing cinematograph films Expired - Lifetime US1900681A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790499A (en) * 1954-05-11 1957-04-30 Western Electric Co Compound punch and die

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790499A (en) * 1954-05-11 1957-04-30 Western Electric Co Compound punch and die

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