US487520A - Photographic roll-holder - Google Patents

Description

U ITE STATES PATENT OFFICE.

THOMAS S. GILLETTE, OF EVANSTON, ILLINOIS.

PHOTOGRAPHIC ROLL-HOLDER.

SPECIFICATION forming part of Letters Patent No. 487,520, dated December 6, 1892.

Application filed February 29, 1892. Serial No. 423,147. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS S. GILLETTE, a citizen of the United States, residing at Evanston,in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Photographic Film-Holders, of which the following is a specification.

My invention relates to improvements in photographic apparatus of that class in which negatives are made from a continuous sensitive film and more particularly to improvements in devices for. holding such films in place.

The invention is fully described and explained in this specification and shown in the accompanying drawings, in which- Figure 1 is alongitudinal section of a plateholder embodying my invention, the section being at right angles to the axes of the filmholding rollers; and Fig. 2 is a perspective View of the rollers, a strip of sensitive film being wound about one of the rollers, my improved film -securing device being wound about the other and the end of the film being secured to the end of the securing device.

In the views, A is the body of a plate-holding box of ordinary construction, A the back plate, A the front plate, and B the slide thereof, all these parts being constructed and combined in a manner well known in the art. Within the box are mounted two parallel rollers G 0, provided with suitable means for their rotation, the roller 0 being adapted and intended to hold a continuous strip G of sensitive film ready for exposure and the roller 0 being intended to hold such portions of the film as have been exposed, together with any desired attachment for fastening the end of the film to the roller. In front of the rollers O O-that is, between the rollers and the slide -Bis a stationary table E, adapted to form a backing for the film during its exposure, and upon the ends of the table are two guide-rollers D D, about which the film passes, these idlers being intended to facilitate the movement of the film from one roller to the other across the front of the table E. To the roller 0 is fastened by means of the clamp c the end ofa film-securing strip G of any suitable flexible material, but preferably of thin strong paper. To this strip is fastened a series of transverse flaps g g 9 &c., extending completely across the strip, the rear edge of each of the flaps being gummed or otherwise securely fastened to the strip and its front edge being free from the strip, as is clearly shown in the drawings. The inner face of the free portion of each of the flaps is coated with any gum adapted to be rendered adhesive by moistening, as is also the surface of the strip lying immediately under the free portion of the flap.

The drawings show the end of the film G secured between the terminal flap g of the strip G and the end of the strip itself, the fastening having been effected by moistening the inner contiguous surfaces of the flap and strip, inserting the end of the film between them, and pressing them together.

If it were desired to expose the end portion of the film G, (shown in Fig. 2,) it would be necessary to wrap the film-holding strip G about the roller 0 until the terminal flap g and the end of the film had reached the roller, when a sufficient portion of the film would be exposed for the making of a negative. Upon the completion of this negative the portion thus exposed might be wrapped about the 'roller 0, thus bringing a new part of the film into position for exposure, or the portion thus exposed might be cut off from the continuous film strip and the strip G be severed by cutting it along the transverse line a: 00, Fig. 2, leaving the flap g at the end of the retainingstrip, this flap being thus made the means for attaching the new end of the film to the securing-strip. In this way any number of exposed parts of the film may thus be cut off from time to time, the end of the remaining portion of the film being in each case secured by means of the fiap left at the end of the securing-strip by the last out. As each exposed portion of the film is separated from the securing-strip G in the manner hereinbefore described, the portion of the corresponding flap adhering to the film may be removed by cutting the film along the edge of the flapas, for instance, along the line yy, Fig. 2or the adhering flap may be left to detach itself when wet in the operation of developing .the negative.

It will-be seen that the device illustrated and hereinbefore described forms a cheap, simple, light, and extremely-compact means of securing the successively-formed ends of the film strip and one that is entirely practical and meets every requirement of its use.

In order to prevent accidental unrolling of the film from either of the rollers O C, it is desirable to provide the rollers with some sort of friction device, and in Fig. 1 I show two parallel friction-bars F F, attached to the ends of a spring so constructed and arranged as;

to press the bars against the film wound upon the rollers. This device or its equivalent is,

it at suitable intervals and each adapted to receive and secure the end of the film wound about the other roller, substantially as shown 2 5 and described.

2. The combination, with the roller 0, adapted to receive and support a continuous photographic film wrapped about it, of a second roller 0 and a flexible strip G, having 30 one of its ends secured to said roller, said strip being provided with a series of transverse flaps of flexible material, each having its rear edge fastened to the strip and its front edge free, and theinner face of the free portion of each of said flaps being coated with agum adapted to be rendered adhesive by moistening, substantially as shown and described.

THOMAS S. GILLETTE.

WVitn esses:

R. H. WILEs, CHAS. 0. SHERVEY.

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