US2198396A - Photographic copying apparatus - Google Patents

Description

April 23, 1940.

G. SZASZ PHOTOGRAPHIC COPYING APPARATUS Original Filed Aug. I50, 1934 l l I/ l I 40' z I i I f I2 [j r I I I I I -------=-'L, invzrrrun i EEZA 52/152 //////////l 7////////// Mam ATTDRN EYS Patented Apr. 23, 1940 PATENT OFFICE 2,198,395 PHOTOGRAPHIC COPYING APPARATUS Geza Slur, New York, N. Y., assignor to Electro- Copyst, Inc., New York, N. Y., a corporation of New York Original application August 30, 1934, Serial No.

ary 28, 1938, Serial N September 5, 1933 1 Claim.

This invention relates to photographic copying apparatus and is a division of my copending application filed August 30, 1934, Serial No. 742,078.

An object of my invention is to provide'a photographic copying apparatus which is inexpensive to manufacture, simple in construction and portable.

Another object of my invention is to provide photographic copying apparatus which is capable of being used for copying documents which are larger than the area of the activepart of the pying apparatus. 7

A further object of my invention is the provision of an apparatus for carrying out photographic copying operations wherein the apparatus is contained in a housing, the housing being provided with a working surface adjacent the top thereof upon which the document is to be copied and the sensitized paper is placed, the housing being further provided with a cover having a padded under surface adapted to be brought into engagement with the working surface whereby to bring the document and the sensitized paper into intimate contact under uniform pressure.

My invention further contemplates the provision of a photographic copying apparatus in accordance with the foregoing objects, in which a roll of sensitized paper is mounted in a compartment adjacent the housing for convenient removal of a section thereof and placement on the working surface to enable quick conditioning of the machine for operation without undue exposure of the sensitized paper.

Other objects and advantages of my invention will be apparent from the following description when taken in connection with the accompanying drawing, in which:

Figure 1 is a cross-section of the apparatus with its lid in a raised position.

Figure 2 is a longitudinal cross sectional view of the apparatus with the lid closed.

Figure 3 is an enlarged sectional view of a detail of the apparatus.

Figure 4 is a longitudinal section of the paper container with the lid raised.

Figure 5 is a perspective view of the paper roll.

In the process adapted to be carried out by the apparatus of my invention, I employ light having a large long-wave content, for example, light obtained from a tungsten filament electric lamp, and cause said light to pass through a filter which absorbs light of short wave length, said filtered light then being permitted to pass through a light sensitive paper capable of reproducing strong contrasts on to a document to be Divided and this application Januo. 187,471. In Germany copied and thence back on the light-sensitive surface of said paper, said surface being of low general light sensitivity and consisting chiefly of silver chloride. After exposure, as described, the latent imageon the light-sensitive paper is developed out and fixed in the usual manner except that no dark room is required.

The light-sensitive emulsion preferably includes a sensitizer for light ofv long wave-length, that is in the yellow and red portions of the spectrum, such as erythrosin, and in order to decrease the general sensitivity of the emulsion a desensitizer may also be added such for example as saflranine which possesses the additional advantage of being optically sensitive.

fitted with a hinged lid carrying a pressure plate adapted to press the document to be copied and the light sensitive paper on to the above mentioned glass plate.

Referring to the figures, the apparatus comprises a portable box-like container I divided into two compartments. In one of these compart ments 9. reflector 2 is provided, said reflector being of parabolic transverse cross-section and rectangular longitudinal cross-section and extending the whole length of the compartment.

A tubular light source 4, controlled by a switch 3, is located on the focal line of the reflector 2 and may consist of an electric incandescent lamp preferably having a tungsten filament. Said light source is fed with over-voltage so that the light contains a large amount of rays of long wave-length.

The light reflector 2 is covered by a dispersion plate 5 which is colored yellow so as to form a filter for any light of short wave-length issuing from the source 4. Said plate 5 is uniformly illuminated by means of the reflector 2 and is also illuminated by the direct rays from the lightsource I and-I find that owing to the efficiency of the illuminating system and the use of an emulsion containing a sensitizer for light of long wave-length, I can employ less intense light sources than those hitherto necessary with a consequent reduction in the development of heat.

The top of the box I is covered by a plate 5 of clear glass spaced from the dispersion plate 5 and the upper surface of said plate 6 projects above the edges of the box. Said plate 6 is secured in an easily removable manner by bars 1 in such a way that its upper face projects above the level of said bars. This can be achieved by beveling the end edges of the plate 6 in the manner shown in Figure 3 of the drawin The box i has a hinged lid 8, which can be supported in a vertical position by means of stays so as form a screen protecting the plate 5 from bright light while the sensitized paper is positioned thereon, emulsion uppermost. The aforesaid stays of the lid 8 are releasable, so that said lid can be moved backwards into a horizontal position in a plane which is lower than that of the upper surface of the plate i so that parts or sections, for instance of maps that are larger than the working surface of the apparatus can be copied. The application pressure' in such cases is applied by any suitable means, for example, by means of weights, although when copying a document which does not extend beyond the area of the plate 6, the lid is adapted to provide the necessary pressure. For this purpose, said lid carries a plate 8 of glass or metal, the outer face of which is flat and corresponds with the upper surface of the plate 6. Behind the rigid plate 9 is a cushion 10, for example of porous rubber, with the aid of which the plate 9 may be pressed elastically against the plate 6. The working surface of the plate 9 is covered with a layer ll of felt or the like to produce a uniform bearing pressure between the plates 6 and 9 even if a foreign body, such as a book clip or the Lke, lies between them. The layer H has the further advantage that it prevents any suction or draught which may otherwise be caused on raising the lid and which might result, for example, in the pages of a book being turned over.

The other compartment of the box I is in the form of a container i2, the long walls, bottom, front wall and rear wall of which are firmly connected together. On the rear wall a bearing block [3 is secured, which serves as support for the journal ll of a paper roll IS. The opposite end of the paper roll has a square recess l6 into which fits a journal I! provided in the wall of the receptacle. The journal I! is mounted in the front wall 18. As the two ends of the paper roll 15 are formed differently, the roll cannot be wrongly inserted in the compartment. A locking device l8a is provided for preventing inadvertent reverse movement of the paper roll II,

The lid IQ of the compartment containing the paper roll i5 is removable in an upward direction, and is generally secured by screws 20. In the lid 19 a flap 2i is provided, which is normally pressed under the action of a spring against the surface of the lid is. The lid ll further carries a half bearing corresponding to the half bearing of the block I, and has on its lower surface strips 12 and II which engage one over the other. One of these strips is formed as a cutting of! device, and the other as a guide for the paper as it is drawn from the roll II. The protective paper for the roll [5 is folded inwards at its front end and cut obliquely in front. After removing the first wrappings consisting of protective paper, the light-sensitive paper can be drawn off, as required, and separated by the cutting edge of the bar 22. The narrow slit between the bars 22 and 23 is closed in a light-tight manner by the flap 2|, so that on pulling off the paper, only a few millimetres of the unused paper can be reached by light, and these only by a small amount of light. There is consequently no more paper spoiled than is otherwise wasted in cutting. A leaf-spring 24, fastened inside the box, bears with its free end against the point of lead-off of the paper from the roll I, so that even when the diameter of the roll diminishes, the paper web is held in the desired position, and its unintentional slipping out of the slot between the bars 22 and 21 is prevented. The spring 24 can be pressed aside, after lifting up the cover IS, in order to permit of the insertion of a new paper roll. Said paper roll is fitted by passing the recess Ii over the Journal I1, and locating its journal il in the bearing block it. when the cover It is put on, the roll I! is held in the desired working position and any incorrect fitting of the roll in the compartment is impossible. Linings 25 which are concentric with the paper roll l5 are provided inside the box, and prevent the leading end of the paper from catching in the inside corners of the box or casing.

The use, in combination, of the various features described and claimed herein enables reflex copies-of a greatly improved quality to be produced at will either in daylight or artificial light, while the compactness and portability of the apparatus offer important advantages over previousiy known forms of apparatus.

I claim:

An apparatus for carrying out photographic copying operations, comprising in combination, a box-like container divided into two compartments, one a printing compartment containing a light source and the other a paper holding conipartment separated from said printing compartment in a light-tight manner, a working surface at the top of said printing compartment for supporting the paper to be exposed, the top of said paper compartment being disposed in substantially the plane of said working surface, means for rotatably supporting a roll of paper in said paper compartment, a slit-like aperture in the top of said paper compartment extending the entire length of said roll and through which said paper may be threaded, said aperture being formed between the overlapping edges of two plates projecting in opposite directions, and a hinged cover for closing said aperture.

GEZA SZASZ.

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