US1263754A - Photographic-film cartridge. - Google Patents

Description

W. L. FARLEY. PHOTOGRAPHIC FILM CARTRIDGE. APPLICATION FILED 0120.28. 1911.

Patented Apr 23, 1918..

I V EN TOR.

. ATTORNEYS.

WALTER L. FAlEtlLIE-Y, OF ROCHESTER, NEW YORK, ASSIGNOR T0 EASTMAN KODAK GOll/I- PHOTOGRAlPHllC-FILM CARTRIDGE.

Specification of Letters Patent.

Patented Apr. 23, CWT.

Application filed December 28, 1917. Serial No. 209,202.

To all whom it may concern:

Be it known that I, WALTER L. FARLEY, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Photographic-Film Cartridges; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference-numerals marked thereon.

My present invention relates to photography and more particularly to photographic filmcartridges of the usual present type comprising a spool or center, a sensitive film strip wound thereon and a backing strip wound with the film strip on the outside thereof and the invention has for its object to provide a simple, cheap and eflicient means of shifting the strain of winding from the backing to the film strip during the exposure in the camera so that the film will lie fiat in the focal plane. To these and other ends the invention resides in certain improvements and combinations of parts all as will be hereinafter more fully described the novel features being pointed out in the claim at the end of thespecification.

In the drawings:

Figure 1 is a perspective of a film cartridge partially unrolled constructed in accordance with and illustrating one embodiment of my invention, and

Fig. 2 is a longitudinal sectional View through a portion of the strip taken substantially on the line 22 of Fig. 1.

Similar reference numerals throughout the several views indicate the same parts.

I have not, in the present instance, illustrated a roll holding film camera for an extended explanation of the reason why it is necessary to make special provision for throwing the stretching-strain of winding upon the film as this consideration is now well recognized in the art and understood from prior patents and film cartridges now on the market. Referring more particularly to Fig. 1, 1 indicates the film spool or center, 2 the film strip and 3 the protecting backing strip, the lead end of which latter beyond the point at which the film strip terminates being indicated at t. The usual strip of carbon paper interposed between the film and its backing for photographically mark as ing the exposures in a certain type of i t 1 l.

era is indicated at 5 and I prefer to secure the advance end of this carbon strip to the backing 3 by providing a perforation 6 in the carbon sheet and sticking a pastor 7 across the end edge of the latter so that it adheres to the backing beyond the carbon paper at one end and adheres to the backing through the carbon paper at the other as clearly shown in the figures.

The film strip 2, in the practice of my present invention, I attach, at its advance end, to the leader portion l of the backing 3 by a rather long pastor or connecting strip 8 which is light and flexible and preferably composed of relatively thin paper much lighter than the film 2 though shown as of about the same size or thickness in Fig. 2 for clearness. This connecting strip is shown pasted to the film at 9 and to the backing material at 10. In the lead portion 4: of the backing at a point between the attaching points 9 and 10 so that it will come opposite the body of the connecting strip 8, I form an extensible portion 11 by creasing the backing strip transversely and folding over a double portion thereof in a manner clearly shown by the drawing. When, therefore, the lead end of the cartridge is carried on to the winding roll of the camera and the winding "strain is imposed, this extensible portion 11 unfolds, partially or wholly, so that the backing strip refuses to take the strain, the latter being shifted over to the film strip 2 through the medium of the connecting strip 8.

Expansible folds of the nature shown at 11 have been used before but always at a point opposite to the film strip 2, the latter being practically directly connected to the backing, with the result that the fold would not readily expand because confined on one side by the unyielding surface of the camera back and on the other by the substantial stifiness of the film itself. With the present invention only the thin and flexible connecting strip 8 is opposed to the fold and this yields readily and permits the fold to straighten out. Also, the fold is removed from contact with the carbon sheet 5 when used which has been found to additionally oppose the straightening out of the creases in the backing.

I claim as my invention:

In a photographic film cartridge, the combination with a sensitive film. strip and a lob continuous backing strip of heavy material, crease or fold made transversely of the backof a connecting strip of relatively light maing strip. terial attached to the film strip at one end and the backing strip at the other, the back- WALTER FARLEY' 5 ing strip being provided with an extensible Witnesses:

portion at a point intermediate the ends of FRED H. GARDNER,

the connecting strip formed by a doubled CHAs. E. MARTIN.

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