US1454813A - Photographic cartridge - Google Patents

Description

V May 8, 1923. 1,454,813

J. G. JONES PHOTOGRAPHIC CARTRIDGE Filed July 25 1921 WITNESS 15 4 ,INVENTOR W/KW -:1 g

ATTORNEY WXJ/ Patented May 8, 1923.

; UNITED- STATES I 1,454,813 PATENT OFFICE.

JOHN G. JONES, or ROCHESTER, NEW yozax, Assrenon 'ro r nszclvranxonaxooivrrany,

OF ROCHESTER, NEW YORK, A CORPORATION. or NEW YOR rnoroeaarrno cnnrarnen. f

Application filed July 25, 1921. Serial No. 487,448.

T all whom it may concern:

Be it known that I, JOHN G. JoNEs, a citie zen of the United States of America, residing-at Rochester, in the county of Monroe and State of New York, have invented cer-.

tain 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 camerasand comprising a roll 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 margin or border of a roll film. In my copending application, Serial No. 487,447,

filed July 25, 1921, I have disclosed the use of 5 a protective paper having portions of varying flexibility which permit the paper,

even though wider than the distance'between the flanges, to buckle or be compressed upon itself, thus forming light looks at the ends of the spool. This application relates to ceram modifications of this principle, some of the forms here shown being also disclosed in the above mentioned application, and all of them'embodying the broad characteristics covered in that application.

This. application relates particularly to protective paper in which the greater flexi 1 bility is obtained by making portions thereof uniformly thinner than the body of'said paper. These uniformly thinner portions preferably extend longitudinally of'the pro tective paper, and I find that they are most efficacious when at the marginal portion thereof. T i In the form preferred in this application and most specifically'claimed, the uniformly thinner portion is at the extreme. edge. When I refer to the margin of the protective paper, mean a certain limited area or borderalong the edgein contradistinction to the edge itself by which is meant the extreme outer periphery. t v

The advantages inherent in the forms disclosed inthis application are similar to those described in the above mentioned application namely, that the protective paper by,

buckling, flexure, or lateral compression orms alight tight lock, at the ends'of e roll between the material and the flanges;

further, that the slight friction between the flexed paper and the flange prevents the accidental unwinding'of the material to an objectionable degree; further, that the flexii ble edges permit a considerable degree of buckling without tearing of the edges if the spools are not in proper alignment within the camera, and further that the backing paper can expand under the influence of moisture without undue pressure upon the flanges. I I

It is obvious that numerous modifications embodying the invention as defined in the appended claims are possible, and. I have described certain of these as shown in thefigures of the drawing, to whichreferen'ce will nowbe made. Those parts which are the same in thevarious'figuresbear the same reference characters in each. I

Fig. '1 is a perspective View of a partially unwound film cartridge, the leader strip'being broken away; I i

Fig. 2 is a fragmentary View showing an enlarged section of the protective paper;

Fig. 3 is a section of the protective paper andfilm; I

Fig. 4 is a section of a protective strip built up oftwo pieces of material Fig. 5 is a similar section showing astrip built up of three pieces of material; v

Fig. 6 shows strip material formed of two separated bands; I

Fig. 7 is a section of a modified protective band.

Fig. 8 is a section of the same band showing the effect of lateral pressure;

Fig.9 is a section of still a different modification;

Fig. 10 is a fragmentary sectional view of one end of a film cartridge having the film and rotective material interwound thereon and showing the margins of the protective material flexed. v

L It is to be understood that in all of the figures the thicknessof the protective paper is exaggerated in. order to show more clearly the nature ofthe invention. It is to be furth'er understood that the. figures are not drawn to scale.

spool has the customary axial pintle opening D at one end and winding slot E at the other. As thus far described the cartridge is in every way similar to that in general use. The backing paper 1, however, is cut wider than the distance between the interior surfaces of the flanges C, and its edges during the process of manufacture are abraded, pressed or otherwise treated, so that along the margin or border is a uniformly thinner section or ledge 2 of uniform width ending in ashoulder 8. The median portion 4: by which I mean that part of the backingg paper between the margins is uniformly thicker than these marginal portions or borders.

It isto be understood that the backing paper extends the full length of the film and beyond it at each end to form safety leader strips, and that the modified border extends in my preferred form the full length of this backing strip, this structure being sufliciently indicated in Fig. 10, where one lead strip is shown wound next the core at'5 and the other one on the outside at 6. When the paper and film-are thus inter-wound on the spool, the marginal portion of the paper will buckle or flex upon itself and thus be crumpled or compressed. Because of its thinness or fiexiblity, this buckling or compressing will take place with the applica- J tion of only very slight force and will not cause such friction or resistance as to slow up materially the operation of winding in manufacture, nor will it cause undue resistance to the movement of the film through the camera. v

In Fig. 10 is indicated the flexure of the edge of the coiled backing paper, but it is to be understood that it is diagrammatic and that I do not limit myself to any particular way in which the paper may be folded or buckled. Because of the decreased volume at the margins, the paper may be buckled upon itself without such an increase of thickness of the coil as to make the ends thereof of obj ectionably greater diameter than the middle portion,that is, there is room at the end of each coil of paper for it to fold upon itself without dislodging the next adjacent coil to a material degree.

In Figs. 1 and 10 I have shown the protective paper as cut out from the surface toward the film, but it may have the depression upon the side facing away from the film, thisbeing indicated at 7 in Fig. 3.

The backing paper, instead of, being made from a single piece of paper, may consist of two strips of thin paper 8. and 9, one being narrower than the other, as shown in Fig. 4, thus affording along each edge a j margin or border 10 which is of uniform thickness less than that of the median portion of the band.

In Fig. 5 is shown a band made up of than the thickness of the combined strip material.

In Fig. 7 a further modification is shown. In this case the protective band 17 has at its margins, but not at the extreme edges, portions 18 of uniform thickness less than that of the body portion of the band. When a band of this type is subject to lateral pressure at the edges, these thinner portions which are of greater flexibility will buckle, as indicated at 19 in Fig. 8, so that the band as a whole is laterally compressed without being piled up, or made of greater thickness, so that a coil of such material will not be distorted in an objectionable way. I

In Fig. 9 is indicated a protective band in which a series of uniformly thinner portions 20 are formed at intervals across the width, these being of less thickness than the body portion 21 of the band.

In practice I have found that backing paper having a thickness of from .003" to .005" may be reduced at the thinner portions to a uniform thickness of from .002" to .003 with satisfactory results, and that the paper may be cut .04" wider than the distance between the flanges. I do not, of course, limit myself to these particular dimensions, but state them as illustrative examples giving satisfactory results in use. They would vary more or less with the size of the cartridge.

It is to be noted that in the above described illustrative embodiment the end strip which lies outside of andaround the film constitutes strip material embodying flexible portions and the edges thereof act as light seals preventing ingress of light between the, ends of the coil and the flanges.

It is to be further understood that while the different modified forms that I have described and suggested and others which are their equivalents come within the scope of my invention as claimed, these different forms naturally vary in their practicability and have their different peculiar advantages and disadvantages, some being better adapted' for manufacture than others,'and some more efficient for the described and intended purposes. In this application I have particularly shown and claimed that form in which the uniform ledges at the edges form flexible margins throughout the length of the backing paper, this being a particularly desirable form. It is evident that this form includes certain characteristics applicable to cartridges differing widely from the one specifically claimed and I contemplate such variations and modifications as Within the scope of my invention as hereinafter claimed.

Various embodiments of the invention herein claimed are more fully described and specifically claimed in my co-pending applications, 187,450 and &87, 151, both filed July 25,1921. v

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

1. An article of manufacture comprising strips of sensitized material and of protective material interwound in a spiral coil, the strip of protective material being wider than the strip of sensitized material, and the side margins thereof being of a uniform thickness less than that of the median portion of said strip.

2. An article of manufacture comprising a roll of light sensitive material, a support therefor comprising spaced end flanges, and a strip of protective material coiled around said sensitive material and having a longitudinal portion of uniform thickness less than the thickness of the body of said strip, the width of said strip being greater than the distance between the flanges.

3. A photographic cartridge comprising a roll of light sensitive material, a support therefor comprising spaced end flanges, and strip protective material coiled around said sensitive material the protective material having a side marginal portion of uniformly less thickness than the median portion thereof, and the width of the protective material ness less than that of the median portion thereof.

5. A photographic cartridge comprising a 1 spool with end flanges, a band of light sen- H sitive material wound thereon, sheet protective material attached to the film and constituting end strips wound on the spool inside the film and outside thereof, the side margins of said strips being of a'uniform thickness less than that of. the median portions, of the strips, and said strips being wider than the distance betweenthe flanges;

6. A photographic cartridge comprising a spool with end flanges, a band of light sensitive material wound on said spool, a single band of light protective material interwound with said first named band, the

side margins of said protective bandbein'g of a uniform thickness less than that of the median portion thereof.

7. A photographic cartidge comprising a spool with end flanges, a band of photographic film wound on said spool, a protective band consisting of a single piece of opaque paper interwound with said film' band, the side margins of said strip throughout its length being of a uniform thickness less than that of the median portion of said protective band, and said protective band being wider than the distance between said flanges.

Signed at Rochester, New York, this 21st day of July 1921.

JOHN G. JONES.

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