US2041478A

US2041478A - Means for light or photo printing

Info

Publication number: US2041478A
Application number: US674229A
Authority: US
Inventors: Niederle Max
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-06-03
Filing date: 1933-06-03
Publication date: 1936-05-19
Anticipated expiration: 1953-05-19

Description

May 19, 1936. M. NIEDERLE MEANS FOR LIGHT OR PHOTO PRINTING Filed June 3, 1933 4 Sheets-Sheet l May 19, 1936.

M. NIEDERLE MEANS FOR LIGHT 0R PHOTO PRINTING Filed Jun 5. 193s 4 Sheets-Sheet 2 Y QN I.

M. NIEDERLE MEANS FOR LIGHT ORPHOTO PRINTING May 19, 1936.

'4 sheets-sheet s Filed June 3. 1933 m om W,

May 1,9, 1936. M. NIEDERLE l MENS'FOR LIGHT OR PHOTO PRINTING 4 Sheets-Sheet 4 Filed June I5. 1933 Patented May 19. 1936 UNITED STATES" PATENT ori-ICE r2,041,478 MEANS Foa LIGHTl on Puo'ro PRINTING Max Niederle, Miami, F1a. Application ,rune s, 193s, sei-m1 No. 614,229

8 Claims.

My invention relates to means for light or photo printing, vand particularly to a mechanism adapted for, photorotary printing to obtain exact and perfect reproductions of any original, such as a photograph, painting, drawing, printed or drawn page, or other sheet, page or the like, showing an original or reproduction, or any other material or disclosure, that is capable or reproduction upon a dat surface.

Heretoi'ore attempts have been made to produce copies in semblance of iacsimiles, by photographic, photo-engraving, photogravure, lithographie, stone, steel engraving zinc and copper plates and plates of other metals, and bythe use of many other means and methods, but in each instance complicated and expensive types of presses, screens or line screens or other means of producing grain surface eifects, and complicated steps and procedures of production by photographic processes, transferring and reproduction, etching maireready, and the like, requiring the services of highly trained experts and technicians, have been employed; and, even then the result is only'an attempt at a facsimile reproduction. With my apparatus an exact reproduction of an original is obtained by the use of relatively simple and inexpensive apparatus with completely satisfactory results by persons not expertly kand technically trained as heretofore. In this way the result accomplished is not an imitation of the original, but is a direct reproductionr from a negative or other light transparent member.

An object of my invention is to provide means 'for printing or reproducingcontinuously upon a strip or web of paper, or other suitable material, to give successive reproductions from the original negative, or the like, at rapid speeds of production, and with each reproduction substantially identical in lights and tone, and to provide for adjustments and variations to accomplish substantially perfect photo printing from al1 kinds, densities, and varieties of transparent members.

Another object is to so construct the apparatus that continuous, substantially instantaneous, unlform, and perfect contact printing is accomplished.

A further object is to provide mechanism for continuous light printing, employing as the source of light, a neon tube or other' similar member projecting a high intensity of light without giving off heat, which emanationof light is high in sensitive rays and is yet produced with a minimum consumption of current, as compared with incandescent, arc, mercury vapor and other lights heretofore used, thus making possible adjustments and variations in the disposition of the tubular light source to dispose the same in proper proximity to the light transparent member, Without danger or excessively heating, cracking, or otherwise injuring the light transparent member, or the material in contact therewith, or causing expansion or contraction of parte or the mechanism, through variations ci temperature, to thus destroy or interfere with perfect alignment and registry.

Still another purpose of this invention is to provide as a source of iight einanation, one or more light tubes adjustahly mounted to thus vary the direct penetration of light rays therefrom, and means to control the quantity and intensity oi rthe printing light ray permitted to penetrate the transparency.

Another object is to provide focusing or diffusing means, as for instance a condensing lens, which will concentrate the printing light rays on a continuous line throughout the entire width or length of the transparency as it is progressively advanced.

Yet another object is to attain and maintain a complete and perfect non-shifting contact and alignment, and a uniform speed oitravel oi the transparency and the material being printed upon, while being carried through the printing light ray area.

A further object is to provide means, in conjunction with the light tubes, or other source of light, for adjusting and focusing or diusing the light rays therefrom, which means can be in the form of an elongated lens, and which with the light tubes is relatively adjustable to vary the focusing and concentration of the strip or line of-printing light, or diiusance and widening of the same.

Another purpose is to provide an apparatus by which light or photo prints can be made with closest and most accurate registry and placement, with each print accurately sized and dimensioned according tothe original' or transparency, thus particularly adapting the mechanism and process for use in producing prints, and the like, to be subsequently overprinted with coloring or other matter, the reproductions being thus admirably suited for multi-coloring.

A'further object is to so construct the apparatus that a screen can be interposed or otherwise used to give continuous reproductions of the screen itself, or to produce screened, grained, or other varied effects in light printing through a combination with the transparency of a screen or sur- Zit facing or treatment, to give the desired effect in the finished light print.

A still further object is to provide apparatus for accomplishing light printing by a continuous ro,-

tary production, at high speeds limited only by the capacity of the mechanical elements and the sensitiveness of the printing surface, which apparatus can be usedto print quickly and cheaply on one or both sides of a strip or web of material, with a minimum requirement of time, effort and skill in the preparation and makeready, and which apparatus is of such simple and inexpensive character and construction, that it can be installed at low cost, while the operation is carried out with l5 a minimum consumption of current for light sources and the like. l

With the above and other objects in view, which will be apparent to those skilled in the art, my

invention includes certain novel features of construction. assembly and operation, and certain novel steps in the preparation and the process or method of use, which will be hereinafter set forth in connection with the drawings, and then pointed out in the claims. In the drawings:

Figure 1 is a view in side elevation diagrammatlcalhr showing one form of my invention.

Fig. 2 is an enlarged fragmentary view in side elevation of the mechanism at the printing end.

Fig. 3 is a longitudinal sectional view through one of the printing rollers.

Fig. 4 is a view in end elevation of the roller.

Fig. 5 is an enlarged transverse sectional view through one form of printing roller that might be employed.

Fig. 6 is a fragmentary sectional view substantially on line l-- of Fig. 5.

Fig. 'l is a view similar to Fig. 5 illustrating a modified construction.

Fig. 8 is a fragmentary sectional view taken on line l-I of Fig. 1.

Fig. 9 is a transverse sectional view through one form of transparency producing means.

Fig. 10 is a fragmentary longitudinal sectional view on line ill- I0 of Fig. 9.

As the parts are shown in Figure 1 they constitute a complete equivalent of mechanism adapted to sensitize or otherwise treat a continuous web, strip or sheet of paper, the light or photo printing means, and then means for developing, stopping, fixing, washing and drying the paper as printed, to thus permit the supply of paper at one end of the machine and the discharge of a printed and completely finished sheet at the other end, which sheet is ready for cutting, folding, or other treat- `ment, as may be desired.

Referring to Figure l, the roll of paper indicated at I is passed first through a sensitizing or treat-` ing tray 2, then through a suitable dryer or processing apparatus 2, after which it ispassed around printing roll l, for printing one side, and then around printing roll l, for printing the other side. The web, strip or sheet, of paper or other suitable material, is then carried through a developer tank 8, is conducted through a tank 1 in which it is subjected to developer stopper, through tank 8 where hypofixing is accomplished, through a water bath tank 0, and then through dryer I0. 'I'he strip, web or sheet is thus supplied in uncoated or untreated condition at one end of the machine and is discharged at the other end as a completely printed, permanently xed and dried sheet, web or strip, that can be cut, folded, and, otherwise treated or handled, as may be desired.

It is preferable that the apparatus be mounted cess moisture.

on a base Il and be enclosedin a case I2 so that it will be a self-contained unit and can be readily transported and can be moved at will to any place where it is desired for use. On the other hand, the main printing portions only can be employed, 5 in which instance the sensitized or properly coated paper will be supplied at one end and, after proper exposure and light or photo printing, will be discharged at the other end ready for development, fixing, drying and the like. IThis exposed strip, 10 sheet or web can be rolled or otherwise assembled and when properly cased and protected can be taken from the machine to be transported and taken to a photographic laboratory or other place where development, fixing and drying can 'oe con- 15 veniently and expeditiously accomplished.

In the complete mechanism as shown, a motor yshaft i3 has thereon a pinion meshing with drive gear Il, which in turn meshes with the gear pinion I5. This gear pinion I5 in turn meshes with 20 intermediate pinion I8 having its teeth meshed with gear ring Il associated with roller 5. Through this arrangement and intergearing, roll I is revolved in clockwise direction, while roll 5 is turned in counterclockwise direction, both rolls 25 preferably moving at the same speed. A worm gear Il driven from gear I1, or the roll 5, meshes with worm i9 to revolve shaft 20. This shaft 20 has thereon a worm gear 2| through which rotary motion is imparted through worm gear 22 to a 30 roller 23 by which the strip or web 2| is drawn through thedryer Il! and is held in proper tension as it progresses through the various mechanisms and portions of the machine.

While the emulsion carrying tray 2 is shown 35 with an immersion roller 25 dipping the strip 24 into the tray to be coated or treated on both sides, and a squeegee or wiper 26 is illustrated on the discharge side to remove excess moisture, this arrangement might be'varied so that both 40 sides of the strip, web or sheet will be treated by contact with moisture or emulsion carrying rollers, or so that only a single side will be coated or treated. Suitable squeegee or other wiper or like mechanism or parts can be used 45 at the discharge side cf each of the tanks 6, 1, 8, and 9 to remove excess chemicals or moisture, or the sheet, strip or web, can be passed through between rollers serving to press out ex- Where the strip or web is to be sensitized and developed, fixed and treated, within the machine, it will be found highly desirable to provide and use a case i2, having this light proof and preferably providing window or view openings at 55 suitable points closed by ruby glass 'or other material that will afford protection to the lightsensitive coating or material. However, if desired, the machine can be employed without the case I2, when used in a dark room or other 6U place suitably protected against ingress of light to affect the light-sensitive material. It may be found desirable to use the machine in a room or compartment having the characters! the air controlled, as to temperature and hu- U5 midity, to thus insure ideal operating and working conditions irrespective of normal atmospheric temperature and humidity conditions. However, for reasons to be hereinafter more fully explained it is not necessary toprovide cooling 70 means of any sort to draw oil heat generated by operation of the machine, for the reason that there is low generation of heat, except possibly the heat of friction of moving parts, during the operation of my improved mechanism. 75

As intimated, the construction and arrangement from which the web or strip 24 is passed after leaving roll i, through tray 2, tanks 6, 1, 8, and 9, and dryer I0, can be of various arrange-y ments and constructions suitable to meet the particular requirements of use, and the main mechanical'features of my invention are embodied in the rollers 4 and 5 and the parts and mechanisms appurtenant thereto.

The rollers, which can be madeup to be substantially duplicates, have hollow glass cylinders, 21, of elongated form, accurately sized, and preferably ground or otherwise treated to be of substantially uniform external diameter throughout their entire lengths and to be free of hollows or other surface irregularities; and, where two rollers are used as illustrated in Figs. .l and 2, the glass cylinders 21 will be accurately shaped and sized so that the roller 4 will be of substantially the same diameter, and consequently the same peripheral or surface circumference as the roller 5. This hollow glass cylinder 21 is preferably provided with an inner bearing ring 28 at each end, and a ring gear 29 is mounted externally at one end, suitable cushion packings being preferably introduced at 30 and 3| to guard against breakage of the cylinder 21 and to insulate the end of the cylinder against heat transmission from the bearing ring 28 and the ring gear 29, which in operation are working parts of the machine and might thus` be frictionally heated.

Hollow shafts

32 and 33 are provided at each end for mounting of the tubular glass roller 21, and bearing rings 34 arev provided on these tubular shafts 32` and 33. To reduce friction to a minimum, it is preferable that the bearing rings 28 and 34 be provided with suitable ball races to receive ball bearings A35, although other forms of friction reducing bearings `can be employed. By this construction, arrangement and mounting of the parts, the glass cylinders 21 are given a substantially free fioating revoluble mounting on the

tubular shafts

32 and 33, and through the driving connections. As above set forth these cylinders 21 of the two rolls 4 and 5 will be rotated in opposite directions at substantially uniform speed and with sub stantially uniform surface travel.

Through the openings of the hollow vshafts 32 and 33, or through other suitable openings, one or more neon light tubes 36 are disposed to extend substantially throughout the length of the open part of the roller glass cylinders 21, and thesetubes 36 are preferably mounted and held to be adjustable with respect to a predetermined printing or light projecting point or location. As the parts are shown in Figs. land 2, this light projecting or printing point will be, in connection with roll 4, preferably on the upper side substantially at point A, whereas on roller l5 the printing point is preferably on the lower side -substantially at point B, it having been found that such arrangement is convenient for use.

Shaft portions

32 and 33 are fixed or held against rotation with the cylinder 21, and an adjustable shutter made up of the two semitubular members 31 and 38 is mounted within -the cylinder 21 to be in close proximity to the inner wall of the cylinder and yet sufficiently clear the same to not interfere in any way with free rotation of the glass cylinder, or contact with the inner surface thereof during rotation. Through the medium of adjusting

shafts

39 and 40 extending through a portion of the

stationary shaft members

32 and 33, and pinion means 4I thereof.

and 42 carried by these shafts and working in suitable racks on the shutters.the shutter members 31 and 38 can be adjusted to vary the width of the opening 43 between the spaced edges A reflector `44 is preferably mounted within the shutter members 31 and 33 to extend longitudinally at a point opposite the adjustable exposure light opening 43, and the light tubes 35 are suitably arranged within' the reflector. An elongated or prismatic lens 45 is mounted between the light tubes 36 and the light emitting opening 43, and this lens 45 is preferably adjustable substantially on a radial line of the adjustable toward and bfrom the outer surface of the glass cylinder 21 on a line radially from the center of rotation of the cylinder. Adjustments of the lens are fixed and held by clamp nuts 41.

The light tubes 36 are also preferably adjust* able, and as these parts are shown in Fig. 5, slots 48 are provided substantially radially in the end portions carried by the

shafts

32 and 33 so that the tubes 36 can be moved and adjustedV on lines substantially radiating from the rotating center or axis of cylinder 21. it is to be understood that the two ends of the tubes 35 will be adjusted and these adjustments can be fixed and held by clamp bolts 49, as shown in Fig. 8, or other suitable fastenings. With this arrangement of adjustably mounted shutters 31 and 38, adjustable lens 45, and adjustable tubes 3S, the light emitting opening at 43 can be substantially entirely closed, can be opened as a very narrow slit, or can be opened to a considerable extent to give a wide gap or space. The light tubes 35 can. be adjusted to any desired settings, within their limit of movement, to thus vary their position and concentrate or spread the field of light emanatlon; and, lens 45 can be adjusted to vary the concentration of light at the focal line along the outer surface of the cylinder 2i, which focal line is substantially centered along the glass roller 21 at a point indicated at C in Fig. 5, it will be appreciated that the adjustment of the lens d5 permits focusing to draw down and concentrate the center of light projection at the surface of glass cylinder 21 to a hair line, or that this line of light projection can be widened on each side of line C to thus give a wider light band less concentrated and more diffused.. At the same time, the shutters 31 and 38 can be moved to vary the light emitting opening at 43. While I have described the focal line or center -as at C and extending longitudinally on the outer In Fig. 8 I have shown a slightly different and modified arrangement of the parts, and here the slots 50 in which the light tubes 36 are adjustable are shown extending or substantially emanating from the focal light center. This arrangement permits full adjustment of the tubes 36 and the tubes are thus adjustable in a definite relation with respect to the lens and the focal center line longitudinally on the periphery of glass cylinder 21. By the use of neon tubes, giving brilliant lighting effects rich in photo printing rays, concentrating these rays by the use of the lens 45, and adjusting the lens, it is possible to secure clear and sharp prints even though the glass cylinders of the rollers 4 and 5 be very rapidly rotated. andsthe speed of print ing and operation with my improved machine is limited substantially onLv by safe speeds at which the mechanical parts can be operated, as the concentrated and strong photo or light printing rays will accomplish instantaneous printing at any desired speed.

The glass cylinder 21 has a photographic nlm, a light sensitized coating to be made into a negative, a sheet of any suitable transparent subject having the negative material drawn, printed, or otherwise placed thereon, or in fact has the printing negative applied thereto in any desired manner that will substantially accomplish a light transparent negative upon or around the outer surface of the glass cylinder 21.

Tlusnegative is, of course, adherent to or in close contact with the surface of the glass cylinder 21 passing the line C of light center. To carry the web or strip 24 in proper contact with the surfaceof cylinder 21 of therollers 4 and 5, I provide contact feed webs 5I made-in the form of endless belts and carried over rollers 52 so that the feed belts will have a portion of their length disposed around a part of the circumference of each of the cylinders 21 to thus conduct the web around the roller 21 and hold the strip 2l in close contact with the surface of the roller. A direct contact roller 52 can be provided bearing longitudinally against the feed belt 5i substantially along the center of light contact, at C. With this arrangement, the sensitized strip 24 is fed and led around the cylinder 21 with its sensitized face directly in contact with the negative face of the cylinder 21, and as the light rays are directed through the cylinder roller 21 and through the film, a photo or light print will be made upon the sensitized strip or material. As the parts are shown in Figs. 1 and 2, the printing roller I exposes one sensitized side of the strip and the roller 5 exposes the other side, and thus both sides will be subjected to light printing while the strip or sheet is being carried through the mechanism, and due to the drive connections the printings on the two sides of the strip will be maintained in accurate and uniform registry. As the exposure when passing the printing or photo light strip'is of very short duration, the lignt rays will not penetrate from one side to the other of the strip 2l, even though this be a relatively thin paper, it of course being understood that the strip 24 has a highly sensitive surface and therefore requires only short exposure.

while the light tubes as will give substantially equal and uniform illumination throughout the entire length of the printing portions of the cylinders 21, in some work it may be desirable to work with a narrow strip 2l of paper. or other material, and where this is done the ends of the rolls 21, or any other part thereof, can be blocked out to prevent penetration of light. Two or more negatives can be combined in any desired manner upon the roller, and any desired portions can be blanked out for after printing of any special matter, or type can be printed in and photographed or otherwise shown, the same being true with line drawings and in fact any other matter.

Where it is desired to accomplish finished 5 printings having the effect of line screen work, a screen wet plate collodion negative can be stripped to the roller )21; and, it is to be understood that various grained or other screen effects can be employed to suit the particular printed effect to be accomplished.

While the negative can be applied to,` affixed around or assembled upon the glass roller 21 in various manners, it may be found desirable to coat, by spraying upon, flowing, or otherwise applying a sensitized material, directly upon the surface of the glass cylinder 21 of the roller, and where this is done a positive is applied around. the roller 21, as indicated at 54, and the roller is then rotated with a line of light directed to penetrate through the positive and thus create anegative light print in the sensitized coating. This sensitized coating can then be developed and fixed, and then dried, in the usual manner and the roller will be prepared for photo or light printing as set forth above.

In Figs. 9 and 10 I have illustrated means adaptable for use in preparing a negative directly upon the glass cylinder 21, and as here shown the elongated prismatic lens 5B is mounted in a casing 51 to be adjustable toward and from a light center D extending longitudinally along the cylinder 21. As the lens 5B is adjustable, it can be focused very accurately to project a hairline of light through the positive 54 to print the sensitized coating 55, or this lens 56 can be adjusted to give a wider line of light, which wider line is necessarily less intense and more diifused. One or more light tubes 58, which are also preferably neon tubes, or other tubes giving a brilliant light 40 high in photo or light printing rays, 'and yet without the generation of heat, is mounted within the case 51, and a reector 59 is provided to concentrate the rays toward the lens 56. As here shown, three tubes 58 are employed and these 45 are adjustably mounted in radially Aextending slots in the ends of the case4 51 so that they can be adjusted toward and from the lens 5t. In this way, the light can be not only focused through lens 56 to increase or decrease the width 50 and brilliancy of the light at the printing line D, but the tubes 58 can be adjusted, and one or more tubes can be used, to thus increase or decrease the quantity of light available for focusing and concentration throughy the lens 55.

From the foregoing it will be seen that I have provided means for light or photo printing adi mirably adapted for use in projecting accurate and uniform exposure and light prints, which means is well suited for use in printing large 50 quantities of syndicate pictures, post cards, or other matter, as well as for printing circulars, pictorial supplements, magazine or'book pages, and many other members of paper or other strip yns ori sheet material, which have heretofore been and used, to thus give accurate reproductions, not

imitation photography, but true photographs with all of the lights, shadows and tones of the original preserved. Whereas with the various planographic printing processes it has heretofore been necessary to make separate negatives and transfers, to etch the printing surface, and to carry through complicated processesv and procedures requiring the services and handling of specially skilled artisans, and even then the result produced is only a printed reproduction, with my improved apparatus positive original lphotographic prints are obtained and are produced at a speed and cost Well comparable with planographic and printing reproductions.

While I have herein shown and described only certain specic mechanical constructions vand assemblies, it will be appreciated that many changes and variations can be made in the form, construction, assembly, mounting and operation of the mechanism, without departing from the spirit and scope of my invention. f

I claim:

1. Means for light printing comprising, a revoluble tubular transparent roller having a light transparent negative advanced with its outer surface, a light tube disposed within the tubular roller to give penetrating light rays substantially equally throughout the length thereof, means to advance sensitized paper with said roller past a predetermined photo printing line extending along the length thereof, an elongated/lens also within the transparent roller between the printing line and the light tube, and means to adjust said lens to focus and consequentlyvary the width of the photo or light line.

2. Means for photo or light printing comprising, a revoluble tubular transparent roller having a light transparent negative movable with its outer surface, an elongated source of light Within the tubular roller, a lens also disposed Within said roller, means to advance a sensitized strip as the roller is revolved so that the strip travels With the transparent negative, and means to adjust said lens toward and from the transparent cylinder to focus the rays from the light tube and create a printing light line penetrating the transparent negative to reach the sensitized strip, the

adjustment of said lens permitting variation of the width and concentration of the printing light line.

3. Means for photo or light printing comprising, a revoluble tubular transparent roller having a light transparent negative movable with its outer surface, an elongated light tube mounted against rotation within the tubular roller, a lens also held against rotation Within said roller, means to advance a sensitized strip as the roller is revolved so that the strip travels with the transparentI negative, means to adjust said lens toward and from the transparent cylinder to x focus the rays from the light tube and create a a light transparent negative movable with its outer surface, an elongated light tubemounted against rotation Within the tubular roller, a lens also held against rotation within said roller, means to advance a sensitized strip as the roller is revolved so that the strip travels with the transparent negative, means to adjust said lens toward and from the transparent cylinder to focus the rays from the light tube and create a printing light line penetrating the transparent negative tolreach the sensitized strip, the adjustment of said lens permitting variation of the width and concentration of the printing light line, and means to permit adjustments and hold relative settings of the light tube to vary the disposition of said light tube with respect to the lens.

5. Means for photo or light printing comprising, a revoluble tubular transparent roller having a light transparent negative carried and advanced with its outer surface, means to advance a light sensitive strip ,in unison with 4the travel of the light transparent negative, a plurality of cool-operating light tubes disposed within the tubular roller to emanate light rays substantially in equal volume throughout the length thereof, means to conne the light rays to penetrate said transparent roller and the transparent negative in a line extendingv longitudinally to thus affect the sensitized strip in a projected light line progressively throughout its length as advanced in unison with the transparent negative, means adjustably supporting said light tubes to be independently and severally adjustable toward and from the line of light printing emanation, and an elongatedlens interposed within the trans- 'parent roller between the light tubes and the desired line of light emanation and adjustably mounted to be focused to varythe Width and intensity oi light ray projected on the line of penetration through the transparent negative.

6. Means for photo or light printing comprising, a revoluble tubular transparent roller having a light transparent negative associated with and carried upon its outer surface as the roller is revolved, means to advance a strip of sheet material having a sensitized face in unison with the rotation of the roller and the consequent travel of the light transparent negative, a neon light tube extending through said tubular transparent roller and held against rotation, an elongated lens also disposed and held against rotation within the tubular transparent roller and interposed between the neon tube and a predetermined photo printing position, means to adjust the proximity of the neon light with respect to the lens, means to adjust said lens to focus the light rays to penetrate in a line through the transparent roller and through the negative to thus aiect the strip of sensitized material, and shutter means also disposed within the tubular transparent roller and held against rotation therewith to mask against escape of emanated light rays from the tube and adjustable to positively vary the width of focused light rays permitted to pass.

7. Means for light printing upon sensitized sheet strip material comprising, a revoluble hollow roller having the wall thereof penetrable to light and having a negative associated with the wall, an elongated neon light tube mounted Within the hollow roller and extending substantially parallel with the axis of rotation to emanate light rays substantially equally throughout the extent of the negativel along the roller, means to revolve the roller, means to hold asensitized strip to travel with the roller and consequently the negative, and an elongated lens also disposed within the roller between the neon light tube and the negative to focus light rays from the tube 5 low roller having the wail thereof penetrublef to light and having a negative associated with the wall, sn elongated neon light tube mounted within t the hollow roller and extending substantially parallel with the sxis of rotation to emanate lo light nys substantially equally'throughout the extentotthsnetivedongtherolienmeansto revolve the roller means to hold a. sensitized strip to travel with the roller andconsequently the negative, an elongated lens also disposed within the roller between the neon iight tube and the negative to focus light rays from the tube to penetrate the negative and act upon the sensitized strip substantially in a line. and means to adjust and focus s aid elongated lens to vary the relative position thereof between the neon tube and the negative.

MAX NIEDERIE.