US1454818A - Photographic cartridge - Google Patents

Description

J. G. JONES PHOTOGRAPHIC CARTRIDGE May- 8, 1923. 1,454,818

' Filed July 25 1921 J0%GT ones;

WITNESS vEN OR ATTORNEYS.

atented ay 8, 193

JOHN G. :rorms, or scenes-ran, new Yonx, assreuon 'ro rm xonax comrarrv,

or nocnnsrna, n roux, a CORPORATION or n rno'roenmc onn'rarnen.

Application filed July 25, 1921. Serial No. 487353.

To all whom it may concern:

Be it known that I, JoHN G. Jones, a citizen .of the United States of America, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Photographic Cartridges, of which the following is a full, clear, and exact specification.

This invention relates to photographic roll film cartridges of the type commonly used in cameras and comprising a spool upon which is rolled bands of film and protective paper therefor.

More particularly this invention has for its object the elimination of the fault commonly known as edge fog which results from the undesired leaking of light into the margins or border of a roll film. It has 2 been impractical to avoid edge fog by cutting the. ordinary backin paper throughout its length of such a width as always to contact with the inner surface of both end flanges of the spool upon which it is wound.

Certain tolerances must be allowed in manufacture, and thewidth of the backin paper may vary to an ap reciable extent ecause of atmospheric con itions. When the backing paper is cut so wide as to contact. with the flanges under all conditions, the friction between the paper and the flange may be considerable because of the expansion of the aper due to moisture. It has been usuai: therefore, to allorw such tolerances that it is not uncommonffor aspace to exist between the end of the coil and the flange through which light may leak to the margins of the sensitized film.

It is desirable, therefore, to so design the 40 backing paper and flanges that there is a resilient interaction between them, whereby the expansion of the a er is taken up, but without causing sue riction between the flange and aper as to render impractical rapid s oo ing during manufacture or use in an or mary camera. I have discovered that, if the backing paper is cut somewhat narrow and a spacing flange of a character to be later described is placed between the end of the flan e and the end of the'coil, soas to press resi iently against the coil, it will force the opposite end of the backing paper against i the opposite flan e while it is pressing that,

end of the coil, t us preventin the ingress of light atv both ends of the coifi It is obvious that numerous modifications of the principles above described are pos sible, and I consider ali of these as comprised within the scope of my invention as defined in the appended claims. Certain illustrative forms will be specifically de scribed, these bein shown inthe figures of the drawing to w ich reference will now be made. Those parts which are the same in the various figures bear the same reference characters in each.

Fig. 1 is a perspective view of a spool embodying the features of my invention;

Fig. 2 1s an end elevation of one end of this spool;

Fig. 3 is a, section of one end of a modified form of spool;

Fig. 4 is a section of one end of another modified form of spool;

Fig. 5 is an elevation of one end of still another modified spool;

Fig. 6 is an elevation of the auxiliary flange used in the form shown in Fig. 5;

Fig. 7 is a section of. one end of a film cartridge including the film and paper, wound upon still another modified form of spool. a

My improved spool consists of a core 1 of the usual type, upon opposite ends of which are fixed metallic flanges 2 and 3, the core having at one end an axial pintle opening 4: and at the other end the usual key slot 5. Loosely mounted upon the core is an auxiliary flange 6 comprising an annular resilient sheet metal member having struck out from the body thereof resilient springs 7. When the bands of coiled ma terial including film F and backing paper P are wound upon such a spool between one end flange 2 and the auxiliary flange 6, the latter will be forced between the end of the coil of material and the other flange 3, and the resiliency of the tongues 7 will constantly force the inner surface 8 of the auxiliary flange tightly against the end of the coil of the material. If the coil should now expand due to moisture, it would, of course, somewhat increase the compression of the springs 7, but not enough, nevertheless, to cause the material to 1 am or tear in use, and y it would under all conditions maintain a tight joint between the ends of the coil and the contacting surfaces.

The resilient tongues may be struck from either flange. When the material of the resilient tongues is struck from the auxilia ings are filled by the material of the flanges,

the flanges being spaced by a distance less than the thickness of the spring, so that the amount 0; light that can leak through them is negligible and much less than frequently occurs under ordinary conditions. However, in order to prevent any such accidental light leak, the interior surface of the auxiliary flange may be lined with paper,

- as indicated at 9, Fig. 7. Another way of overcoming this difiiculty is to flange either the auxiliary disk shown at 10 in Fig. 3, or to flange the fixed disk as shown at 11 in Fig. 4, in either case the flanged disk encircling the other and constituting a, llght seal for the space between the two flanges.

Another modification of my invention consists of makin the auxiliary flan of a single annulus 0 sheet metal 12, which is cupped as shown in Figs. 5 and 6. This flange preferabl fits loosely upon the core where it joins t e fixed flange 3 at one end of the spool. The auxiliary flange has a central opening 13 from which extend radial slits 14.

It will be obvious that this form, like the one first described, has an inner surface which bears against the end of the coiled material, although in this case it bears articularly against the outer eonvolutions thereof, andit has an opposite resilient portion or surface which bears against the fixed end flanges. In each of the forms described there is an inner surface in a plane and bearing against'the on o the coil and. the outer surface bent from that plane and bearing against one of the flanges. In certain of its aspects the forms shown in Figs. 5 and 6 ma be considered as a modification of the fi m spool described and claimed in the a lication of Edwin F. iggngsbury, Serial 0. 438,888, filed Jan. 21,

Having thus described my invention, what I claim as new and desire to secure b Letters Patent is:

1. A photographic film cartridge comprising a core with fixed end flan s, a coil thereon comprising bands of sensltized material and of protective material, and an anwagers coil and the adjacent end flange, said auxiliary flange comprisin an annulus of sheet metal, having one suace bearing resiliently against the end of the coil and another. surface bearing resiliently against the flange, V

3. A photographic film spool comprising a core with fixed end flanges and an auxiliary flange loosely mounted on said core adacent one end flange and comprising a caring surface adapted to bear agalnst the end of a coil of material wound on. the spool, and another bearing surface adapted to bear against the adjacent flange,

and resiliently resistant to pressure between the two surfaces.

4. A photogra hie film spool comprising a core with fixe end flanges, and an auxiliary flange comprising a resilient sheet .metal annulus mounted on said core adjaa porcent one end flange and comgrisin t1on lying in one lane and a apted to bear against t e end 0 a coil of material wound on said spool, and another portion bent out I of such plane and adapted to bear against the end flange, whereby resilient pressure may be brought to bear between the flange and coiled material.

5. A photographic afilm spool comprising a core with fixed endflanges, and an auxiliary flange loosely mounted on said core ad acent one end flange and comprisin an annulus of'sheet metal, the edge of w ich lies in one plane, and having part lying out of such plane to constitute a resilient spring portion adapted to press against the adjacent end flange, whereby when strip material is coiled upon said spool said auxiliary flange will bear resiliently between one end flange and the corresponding end of the coil of maAterilal. h fil 6. p otogra ie m s 001 com risin a core with fixe end, flang s, and a l an: iliary flange loosely mounted on said core adjacent one end flange, there being resilient means between the auxiliary flan and the adjacent fixed end flange tending to day of July, 1921.

' JOHN G. JONES.

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