US1436478A - Roll film for photographic purposes and its wrapping - Google Patents

Description

4 s. COCANARI. ROLL FILM FOR PHOTOGRAPHIC PURPOSES AND ITS WRAPPING? APPLICATION FILED SEPT. 3, I92].

1 3 ,473; Patented Nov. 21, 1922.

6277/50 ocazzaz-z' TES enema.

SILVIO COCANARI, OF ROItIE, ITALY, ASSIGNOR T0 I1- GEVAERT ET 00., OF VIEU DIEU,

NEAR ANTWERPEN, BELGIUTE. I

ROLL FILM FOR PHOTOGRAPHIC PURPOSES AND ITSVTRAPPING.

Application filed September 3, 1921. Serial No. 498,542. (GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 192 1, 41 STAT. L., 1313.)

To all to hem it may concern:

Be it known, that I, Srnvro CooANAnr. technician, a citizen of the Kingdom of Italy, and resident of Rome, Italy, have invented certain new and useful Improvements in and Relating to Roll Films for Photographic Purposes and Their W'rappings (for which applications have been filed in Belgium Apr. 30, 1920; Germany, June 1, 1920 "Spain, May 29, 1920; Switzerland, May 25, 1920; Italy May 26, 1920; France May 21, 1920; and England May 21, 1920); and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked therein, which form a part of this specification.

This invention relates to roll films or the like and more particularly to roll films used in conjunction with photography.

The roll films used in photography are generally wound on reels or bobbins together with bands of protective paper forming the wrapping. This wrapping is usually composed of a band of red paper or a band of black paper or a band of black paper covered with a band of red paper. In order to enable the film to be inserted in the apparatus without the use of a dark chamber, the wrapping band or bands are made of such a length that they extend beyond the ends of the films by a certain predetermined length. The commence]uent of the film, that is the end located on the outside of the bobbin when the latter is inserted in the photographic apparatus, is gummed to the wrapping paper, for example, by means of a gummed label. The opposite end however, which will hereinafter be called the final end must remain free in order that the film may always remain quite flat against its wrapping paper whilst it is being unwound in the apparatus and wound up in an opposite direction on another reel, in spite of the difference in length which will obviously occur between the film and its protective wrapper when they are wound up together.

After the film has been exposed it is wound in the opposite direction upon a bobbin with its final extremity on the outside of the reel.

a dark chamber, it is necessary to be able 7 to wind the film afresh on the metal reel or bobbin of the developing apparatus. Therefore in order that the film may, during this operation, be drawn'by its protective wrapper it has been necessary with films hitherto employed, to stick the final extremity of the film to its protective wrapper by means of a gummed label. In, order to effect this gumming, the end of the paper of the film must be unwound, and in spite of the precautions which have always been taken there has always been a risk of exposing the end of the film to the light. 7

The present invention avoids this preliminary gumming ofthe final end of the film on the paper by an arrangement such that the final end of the film is attached permanently to its protective wrapper at the same time permitting a relative slipping action to take place between'the film and its wrapper. To this end according to this invention the final extremity of the film is in the form of a tongue which is inserted in a slot in the protective wrapper. This tongue is permitted to slide freely in the slot to allow of the displacement of the film relatively to its wrapper at the same time securing sufiicient relative fiXity between the film and. the wrapscribing in any suitable manner the name,

place, date or the like particulars. In order that the sensitive face of this tongue, which may be exposed to the light, shall not become black when developed it may be protected by coatings or any other suitable means.

The invention will be morereadily understood when read in conjunction with accompanying drawings in which Fig. 1 is a view of the film unwound,

Fig. 2 a view of the film partially unwound after it has been exposed in the photographic apparatus.

Fig. 3 shows the final extremity of the sensitive face of the film.

The film 1 is shown wrapped with its back against the black surface 2 of its protective wrapper which is coated with a sheet of red paper 3 The ends of the wrapper extend beyond the film to enable them to be fixed to the reels or bobbins. The end of the film is stuck to the protective wrapper by means of a gummed label 4. whilst the final extremity forms atongue 5 which is inserted freely in a slot 6 in the protective wrapper.

After the film has been exposed, inscriptions for the identification of the film may be made on the back of the tongue 5, by unwinding, with precaution, the film until the back of the tongue appears (Fig. 2). In

order to ensure that a good inscription is made upon the tongue 5 of the film it may be subjected to suitable treatment, for example, covered with a matte coating, or be rendered matte by a pouncing or the like.

The sensitive face of the tongue 5, which has been exposed to the light during these operations of inscriptions, will become black in the developing bath, and consequently in order to avoid this disadvantage, the sensitive "face of the tongue 5 may be covered with a layer of protective Varnish made oi collodion or resin (Fig. 8) or an impervious label gummed to the film by means of gumlacquer.

\Vhat I claim is 1. A roll film for photographic purposes comprising a film, a protective wrapper for said film having one end of the film connected therewith, the free end portion of the film being provided with a tongue extending longitudinally of the film and said protective wrapper having a transversely extending slot receiving said tongue to hold the free end portion of the film in engagement with the protective strip and permit sliding movement of the film longitudinally of the wrapper.

2. A roll film comprising a film, a protective wrapper having a transverse slot and to which the film is fixed at one of its ends, permitting the film to slide relative to the wrapper, and a longitudinally extending tongue provided at the other end of the film, said tongue being adapted to be passed through the transverse slot in the protective wrapper, and the back of said tongue being prepared to receive inscriptions.

3 A roll film for photographic purposes comprising a film, a protective wrapper having a transverse slot and to which the film is fixed at one of its ends, permitting the film to slide relative to the wrapper and a longitudinally extending tongue provided at the other end of the film, said tongue being adapted to be passed through the transverse slot in the protective wrapper, and means for protecting the sensitive tace of said tongue against light A film roll comprising a film, aprotective wrapper, means "for fixing one extremity of the film to the wrapper, a tongue provided at the other end of the film and adapted to be inserted into a slot in the protective wrapper, the back of said tongue being prepared to receive inscriptions.

5. A film roll comprising a film, a pro tective wrapper, means for fixing one extremity of the film to the wrapper, a tongue provided at the other end of the film and adapted to be inserted into a slot in the protective wrapper, and means for protecting the sensitive face of the tongue against light.

In testimony whereof I afiix my signature in presence or two witnesses. i

SILVIO COCANARI.

Witnesses Vmsnnao PUTI Tns'rmon'n, MnnrUo I norunsno.

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