US1760149A - Developing apparatus with tubular gas discharge - Google Patents

Description

May 27, 1930. A. LANGSNER 1 1,760,149

DEVELOPING APPARATUS WITH TUBULAR GAS DISCHARGE A. LANGSNER May 27, 1930.

`DEVELOPING APPAIRATUS WlTH TUBULAR GAS DISCHARGE Filed Jan. 13, 1928 3 Sheets-Sheet 2 May 27, 1930. A. LANGSNER 1,760,149

DEVELOPING APPARATUS WITH TUBULAR GAS DISCHARGE Filed Jan. 13, 1928 3 Sheets-Sheet 5 Patented May 27,1930

UNITED STATES- PATENT' OFFICE ADOLPH LANGSNER, 0F CHICAGO, ILLINOIS, ASSIGNOR T0 EUGENE DIETZGEN COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE DEVELOPING APPARATUS WITH TUBULAR GAS DISCHARGE Application led January 13, 1928.l Serial No. 246,460.

My invention relates to apparatus for developing light sensitive material, such for instance, as paper, by the action of an alkaline developing gas, such for instance, as ammonla gas.

One of the objects of my invention is to provide a compact cabinet type of device in which the sheets or continuous strips of the light sensitive material are fed through the cabinet and wherein `they are subjected to the action of the developing gas in a manner to develop the sheets or strips in a minimum time and travel, and wherein also, the sheets are passed through a Ventilating chamber within the cabinet to remove the occluded gases from the paper before discharging the same outside of the cabinet.

Another object of my invention resides in providing a developing apparatus of the above type, wherein the developing gas is projected against one of the traveling carriers which feed the light sensitive material, or paper, through the cabinet. An ancillary object of this feature of my invention resides in the utilization of a tubular valve-like construction which may be opened and closed and regulated whereby it controls the amount of developing gas projected against the feeding mechanism, or against the light sensitive material itself, if Idesired, and by which means the control and flow-of the gas is at all times effected from a convenient point outside of the cabinet and in a manner such that the operator will not be subjected to the injurious action of the developing gases during the operation of the machine.

Still another object of my invention re'- sides in a novel arrangement of receptacle or cradle into which the developed paper is discharged as it is fed from the machine and which cradle is constructed and arranged to assist in removing the occluded gases from the discharged paper whereby the ammonia gases are not liberated to the atmosphere and whereby practically all traces of the ammonia gas are effectively removed from the developed paper.

Still another object of my invention esides in the provision of improved means for releasing the blanket from the cylinder roll and in the means for adjusting thetension of the blanket at either longitudinal edge to keep the blanket and cylinder in alignment.

Fig. 2 is a plan view taken on line 2 2 of Fig. 1. L

Fig. 3 is a section taken on line 3-3 of Fig. 1.

Fig. 4 isa view of a modified form of the construction shown in Fig. l.

Fig. 5 is a section on line 5 5 of Fig. 1.

Fig. 6 and 7, are sectional views taken on line 6-6 of Fig. 5, (showing diierent posia tions of the gas valve.

Fig. 8 is a view showing modified manner in which blanket and cylinder may be released for adjusting the light sensitive material, and Fig. 9 is still another modification of such an arrangement.

In general, in the preferred form of my invention herein enclosed, I provide an enclosing cabinet arranged to form a develop* ing chamber proper and a connected ventilating chamber together with means, preferably power driven, for feeding either sheets or continuous strips of light sensitive material, such as paper, from the entrance to the developing cabinet, through the developing chamber, thence in and through the ventilating chamber and thence out of the machine into a discharge receptacle of especial construction. During the travel of the light Sensitive material through the developing chamber by means of traveling feed carriers, I subject the material to a stream or jet of ammonia as which is projected on to the surface cfg the carrier through a tubular rotatable valve, and in addition, this rotatable carrier is provided with a slightly porous surface adapted to hold the gases occluded therein, whereby throughtheir contact with the light sensitive material a greater and more effective developing action is secured as the paper is fed along;

Referring now to t e drawings in detail;i

terial either in sheet form or in the form ofl I provide an enclosing cabinet 2, preferably mounted on legs or standards 4, and the cabinet is formed with' a horizontal partition 6, to provide a lower developing chamber 8, and an upper Ventilating chamber 10. Beneath the base lof the developing chamber I mount a prime mover, such as a motor, adapted to drlve a shaft 12, on which is mounted a worm 14, meshing with worm gear 16, .on ashaft 18, which in turn carries a sprocket wheel 20 meshing with a chain 22. Within the ventilating chamber I provide a suitable support or bracket 24, and upon this I mount the means for feeding the light sensitive material into, through, and outside of the developing chamber. `In the present instance, this feeding means comprises two relatively moving traveling carriers, viz., a relatively large cylinder 26, and a continuous blanket 28. The cylinder is mounted on a shaft 30 in the bearing or support 24, while the blanket is adapted to pass around a series of guide rolls 32, 34, and 36. The guide roll 32 is located at theuppermost part of the developing chamber 8 adjacent to the upper portion of the cylinder 26. Guide roll 36 is located at the front of the developing chamber beneath-the cylinder 26 and ad] acent to the inlet opening 38 of the cabinet. Guide roll 34 is mou/nte on a bell crank lever 40 pivotally mounted as at'42, on the bracket 24. The construction and o eration of this bell crank lever will be later escribed. As shown, blanket 28 is thus arranged to pass peripherally about the rearmo'st half of the cylinder 26 and in firm contact with said cylinder. Sprocket chain 22 passes over a sprocket 42 on the feed roll 36, and thereby serves to drive this feed roll, and hence to cause the blanket to travel into the continuous path illustrated. In a similar manner, by reason of the peripheral contact of the blanket with the cylinder 26, the cylinder also is rotated. The light sensitive maa continuous strip is introduced throuvh the lopening 38, being pushed across a ledge or bracket 44, and beneath a felt or rubber packing or gasket 46 attached to the inner wall of the cabinet, and which gasket serves to prevent the escape of the developing gas through the inlet openin 38. As the innermost end of the light sensitive material is fed through openin 38, it is directed by any suitable deflector into the bite formed by the traveling blanket 28 and the rotating cylinder 26 where the material is carried around between the blanket and the cylinder to a point in the present construction beneath the feed roll 32,

where it is discharged between two deflectors 48 and 50 located at the mouth of the entrance between the developing and ventilat- 7it is constructed as a rotatable sleeve valve comprising an outer rotatable tubular sleeve 52 embracing an inner stationary tubular member 54 mounted to the casing 2. The sleeve 52 is journaled on the member 54, and being hollow, the innermost tube 54 is connected by means of a nipple 56 with a flexible tube 58, connecting with any source of ammonia gas, preferably under controlled pressure. In addition, the inner and outer sleeves 52 and 54 are provided with slots 60 and 62 which extend, preferably, the length of the tubular valves, which length is suiicient to accommodate sheets or strips of light sensitive material of a maximum width. In addition, the outer tube'52 is provided with an arcuate bracket 64 riveted thereto as at 66, which bracket is provided-With a handle 68 for turning the outer casing, whereby when such handle is turned annularly, the slots and 62 will be made to open or close more or less and thereby control the fine streamor sheet of developinggas which is projected from the valve. Obviously, by rotating the valve far enough, the discharge of gas will be wholly cut off or will be opened to its maximum amount. The advantage of such construction resides in the ability to control from the exterior of the cabinet the discharge of the gas within the interior developing chamber, whereby the operator will not be subjected to the injurious action of this ammonia. gas when the developing action is not needed.

In the form of my invention in Fig. 1 of the drawings, this gas discharge valve is i1- lustrated as being locatediin suitable .bearings 70 and 72 immediately beneath the lowermost part of travel of the blanket 28, whereas in Fig. 4 of the drawings it is located'immediately beneath the large cylinder which constitutes a part `of the feeding means. In the rst instance, the blanket itself is formed of rubberized fabric, or any other material provided with a porous surface adapted to hold the developing gas in occlusion therein; for instance, the blanket may be rprovided with a relatively soft rubber surface which is slightly porous, and when the ammonia gases are discharged'directly into contact with this traveling blanket the ases will be retained in the pores so that as t e blanket is fed along and comes intodirect contact with the light sensitive material, such as paper, it will provide a more effective and intimate developing action, especially so since the' gases are retained within this rubber surface and between the light sensitive material and the surface of the cylinder.

In the construction wherein I project the gas directly into contact with the cylinder itself, then of course the cylinder is provided with such a porous surface; in some instances it is Within the contemplation of my invention to arrange this tubular valve so'as to discharge directly upon the sheets or strips of light sensitive material just before they pass between the traveling carriers; however, I prefer the constructions illustrated.

I preferably provide the handle 68 of the valve with the locking device for holding it in any desired position. To this end, the support 2 (Figure 3) is provided with a bracket 74, formed with a step-like surface, con sisting of a plurality of notches 76, into which this handle 68 may be pressed so as to hold it in the adjusted position.

In the modification shown in Fig. 4 of the dra-Wings, the cabinet 76 is provided with an interior bracket 78 on which the cylinder 80 is mounted as on a central shaft 82. In this instance, the gas projecting valve 84, is shown as mounted immediately beneath the cylinder, and the blanket 86 is mounted to pass around suitable guide rolls 88, 90 and 92. In this instance, the central shaft 82 is provided with asprocket 94, driven by a chain 96 from another sprocket shaft 98 on the motor driven shaft 100, and the front opening of the cabinet is provided with a shelf 104 along which the light sensitive material may be passed through the opening 102 and by the packing 106 into contact with a curved deiector 108, mounted adjacent to the guide roll 88, so that the light sensitive material is forced into position between the cylinder and the blanket 86. l It will be noted that in this instance the cylinder is directly. rotated by a source of power and serves by contact with the blanket 86, also to cause the latter to travel to effect the feeding movement of the light sensitive material into and through discharged deflectors 108 and 110 positioned between thex developing chamber 112 and Ventilating chamber 114. In addition, the roll is ad- ]ustably mounted on an arm 116, adjustably held by ai wing nut 118 so as to adjustably take up the slack in the blanket or cords 86.

The Ventilating chamber 10 shown in Fig. 1 is provided with a series of guide rolls 120, 122, 124, 126, 128, 130, 132, 134 and 136, about which pass two travelling blankets or series of cords; in the latter case, ythe rollers are grooved so as to hold the cords from literal displacement. @ne set of cords, or the blanket 138, is adapted to travel for a good part of its length directly in contact with another set of cords or'blanket 140; in other words, the two sets of cords or blankets travel together from a point between the entering guide rolls 134 and 136 located at the junction of the developing chamber 8 and the Ventilating chamber 10, upwardlyaround the guide roll 26, thence around the guide roll 122, thence downwardly to a point between the guide rolls and 132, where the blanket 138 or cords passes upwardly by itself around the guide rolls 124 and 120, thence downwardly around guide roll 128 and thence back to guide roll 134. In the saine way, the

blanket or cords 140 passes by itself from` the guide roll 132 to guide roll 136, and all the rest of the time it is travelling in contact with the other set of cords or blanket. By this arrangement when the light sensitive sheets or strips of material or paper are discharged through the deflectors 48 from the developing chamber, the developed material will thus pass between the cords or blanks and will be carried about in tortuous or circuitous paths about the Ventilating chamber where the occluded gases in the material will be subjected to the action of the moving column of air which enters through an opening 142 and sucked out of the chamber 10 by means of a suction fan 144. These belts, blankets, or cords which pass around the several guide rollers are driven by means of a sprocket chain 146 passing over a sprocket gear 148, on shaft 150, on which the guide roller 134 is mounted, and this chain 146 is in turn driven from the sprocket 42 in the developing cham; ber.

ln the form of my invention illustrated in Fig. 4, a somewhat similar arrangement of cords and belts 150 and 152 is provided so as to pass about a somewhat similar arrangement of guide rolls, whereby the light, sensitive material-is carried from the discharging end of the developing chamber through the Ventilating chamber and is finally discharged through deflectors 154 and 156 to the exterior of the cabinet at the front of the machine. In this instance, the guide roll 158, about which the belts pass, is driven directly from a sprocket 160, about which a chain 162 passes, which chain is driven from the cylinder sprocket 94.

One of the novel features of my present invention resides in the provision of a cradle or receptacle, into which the light, sensitive material, such as strips or sheets of paper is discharged from the cabinet. In the present instance, this receptacle is constructed and arranged so as to assist in removing the occluded gases in the paper. To this end I provide a sheet metal cradle 164, which has spaced apart walls to vprovide a hollow interior 166; the upper curvilinear wall 168, of-

this cradle is provided with a series of slots or perforations 170. which are particularly co-extensive with the inner upper wall of the receptacle, and this receptacle is provided at one end with a connection 172, with a suction fan, preferably suction fan 144, a1- though a separate suction fan may be used, if desired. By reason of this construction, when the light sensitive material is discharged into the cradle or receptacle, it is at once subjected to the drawing action of the air, which is sucked through the slots 170, so that the occluded ammonia gases are pulled out of the paper and removed through the conduit 172.

In addition, the cylinder shown inFigjl,

in the drawing ibs provided with means for adjusting the blanket, so that it will not come out of registration with the cylinder. To this end, I provide a pair of bell-crank levers 40, at each end of the width of the cabinet, which bell crank levers are pivotally mounted as the sprocket 42 in the 11p-standing bracket 24. One of the arms of each of these bell crank levers 40, to wit, 174, carries a bearing 176, in which islrotatably mounted one of the arms of each of these bell crank levers 40, to wit, 174, carries a bearing 176, in which bearings are mounted two nuts of ,the shaft carrying the guide roll 34.

In addition, these bell crank levers 40, are provided with lateral extending arms 178, connected by means ofsprings 180 to arms 182, pivotally mounted as at 184 to support 72, and each arm 182, is in turn provided with an adjustable stop consisting of a screw 186, threading through a lug 188, whereby when screws 186 are adjusted, the positions of the respective arms 182 are altered and the tension of the springs 180 is adjusted. A tripping lever 190, is pivotally mounted on part 192 on the support and the inner end, 194, of this lever underlies the spring connected end of each of the levers 178, there being two of these tripping levers, the same are in turn connected by means of relatively long links 196, to another lever 198, connected to a cross shaft extending the width of the machine, which cross shaft has intermediate to its length a pedal 202, whereby, when the pedal is operated, the tripping lever 190 is actuated to raise the toe 194 thereof, and to raise the bell crank lever arm 178, whereby it throws the roller 34 inwardly and e releases tension of blanket 28. Normally, this blanket at each end is under the tension of the springs 180, which may be adjusted to produce a correct alignment of the blanket as it travels about .the guide rolls and cylinder. By reference to Fig. 1, it will be seen 'that at the junction between the feed roll 36 and the cylinder, and the feed roll 32 and the cylinder, there is a space approximately {th to gth of aninch between the felt roller and the blanket. Roll 36 carries a sprocket gear, being driven by the chain. As soon as the operator presses upon the pedal 202, link 196 will be pulled down, which will raise toe 194 to shift lever arm 178 upwardly. thus releasing the tension on the guide roll 40 carried by the arm 174. As soon as the tension of the blanket is relieved through the normal movement of roller 40, the chain 22 pulling on the roller 36 while running, will naturally drive the blanket forward and cause the same to sag downwardly as shown in the dottedl lines; thus, the ltension between the blanket and the felt roller is relieved and paper can be adjusted to any position desired.

By reference to Figures 8 and 9 of the drawings, I have shown a construction adapted to the modifications shown in Figure 4 of the drawings wherein the cylinder 80 is driven, and b this contact with the cords or springs or be t 86 serves to drive the latter. Figure 8 shows the manner of releasing the paper between the cylinder 204 and the relatively small belts or strings 206. In this instance, the cylinder 204 is moved away from the belts or blanket 206. In this convstruction the guide rolls 208 and 210 are mounted on a bracket 212 carried on the side of support 214. This bracket 212 has an upper arm 216 which is provided with a semicircular branch 218 illustrated with dotted lines, which is fastened to the support 214 through a pivotal point 220. In addition, this pivotal axis 220 forms a pivotal point for a depending arm 222 carrying at each end a bearing 224 for the cylinder shaft 226. The

support 214 is provided with a lug 228 through which passes a screw 230 adapted to engage the pivotally mounted arm 222 for adjustment purposes. There are two of these arms and two of these adjusting screws, one for each end of the cylinder shaft 226. By this means each end of the cylinder is kept in correct alignment with the traveling blanket, cards or belt. In addition, thedower end of each arm 222 is connected by means of a spring 232 with any stationary part of the support 214, in this instance, connected to a bearing for the guide roll 234, around which the cords or blankets or small belts pass. In addition, the support has pivotally mounted thereon as at 236, the bell crank lever 238 having a toe 240 adapted to shift into contact with the lower end of the pivotally mounted depending arm 222. The opposite end of the bell crank lever 238.has connected to it the link 240. Each one of these links connects to a lever arm similar to lever 198 shown in Figure 1, at the gear portion of which pedal 202 is connected. In the operation of this device when the pedal is depressed the pivotally mounted depending arm 222 is forced forwardly and upwardly to shift the'bearings 224 of the cylinder shaft away from the traveling cords or belts or blanket 206, whereby the paper may be adjusted or released. In addition, the bearings for the roller 234 are pivotally mounted as at 242 at each end thereof, and these'bearings are provided-with a lateral flange carrying-lat eral fiange 236, each carryin an adjusting screw 238, whereby each en of the guide roll 234 may be adjustedto keep the belt in ali ment with the cylinder.

iilFigure 9 the cylinder 246 is mounted in bearings 248 at each end thereof, which bearings are pivoted at 250, and two arms 252 are connected by means of springs 254 to the stationary-support 256, so that the cylinder is normally pressedl against the travelin cords or blankets 258 which pass around 51e various guide rolls 260. In addition, a bell craiik lever 262 is pivoted at 264 to support 256 and a link 266 connects withI the foot pedal as before, there being two bell crank levers 262 and two link arms 266 as hereinbefore described, whereby when the lever is depressed the shaft 248 of the cylinder 246 is raised upwardly from the traveling blankets to release the paper and permitits adjustment. In this construction, the guide roll 268, around which the belts or blanket or cords travel, is pivotally mounted at 270, and carries at its outer end 272, an adjusting screw 274, which may be adjusted to regulatey each end of the shaft 268, there being one such adjustment at each end of the shaft to regulate the alignment of this belt relatively to the cylinder.

It will thus be seen that I have provided a very compact and commercially operative developing apparatus wherein either sheets or strips of light sensitive material may be fed through interruptedly or in a continuous :manner through the cabinet wherein they are subjected to the sequential developing and degassing operations. In the developing operation the pure ammonia gas is projected in a thin sheet against either the traveling blanket or the traveling cylinder, or both, or against the light sensitive material itself, while at the same time the material is continuously passed through the developing chamber., In addition, by means of the packing strips 46, located both at the inlet and discharge openings of the cabinet, the gas is prevented from escaping to the atmosphere. The particular details of construction of the valve mechanism for discharging the gas in sheet form against the traveling blanket is particularly adaptableto my improved type of construction, since it permits of the control of this gas discharge from the exterior of the machine where the operator is not subjected to the gaseous fumes, and also in a 4 manner which permit of the exact and minute regulation of the volume of gas discharged. Also, by the arrangement of this gas discharge in combination with the porous blanket or cylinder, I am enabled most effectiyely to procure a quick development of the light sensitive material and without wetting the same, thereby endangeringthe light sensitive material due to the usual bleeding or warping. Also, by the arrangement of my improved ventilated chamber and the manner in which the light sensitive material is discharged from the blanket and cylinder into the traveling belts or cords and carried through the Ventilating chamber, and also in my new arrangement of the discharge cradle or receptacle for receiving the ultimately developed paper, and which cradle is provided with means for removing the occluded gases, I am enabled to develop the paper in a minimum time and free from obnoxious developing gases.

It will thus be seen that I have .also provided a novel type of means for releasing the little belts, cords or the blanket from the cylinder, and this means also includes various modifications for accomplishing this and also for accomplishing the alignment of the travcling cords, belts or blanket with respect to the cylinder.

It is thought that the invention and numerous of its attendant advantages will be understood from the foregoing description and it is obvious that numerous changes may be made in the form, construction and arrangement of the various parts of the apparatus disclosed without departing from the spirit and scope of my invention or sacrificing any of its attendant advantages, the form hereinbefore described being a preferred embodiment for the purpose of illustrating my invention.

I do not claim herein any of the subjectmatter described and claimed in my cepending application Serial No. 245,333, filed J anuary 9, 1928 for Developing apparatus with blanket adjustment and spray application of liquid ammonia.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

l. In developing apparatus for light sensitive material, the combination of an enclosing cabinet forming a developing chamber, means in said chamber for feeding light sensitive material therethrough, and a tubular valve located in said chamber and con- ,Y

nected to a source of ammonia gas, said valve being constructed and arranged to discharge a sheet of ammonia gas directly into contact with the feeding means, and said feeding means having a porous surface to occlude the gases and to bring such occluded gases into contact with the sensitive side of the light sensitive material. f i

2. In a developing apparatus, the combination of a rotatable cylinder having a porous surface, means for projecting ammonia gas against said porous surface and means for pressing the sensitive side of light sensitive material to be developed against said porous surface and means for rotating the cylinder, whereby to develop said material as the carrier travels, said ammonia projecting means comprising a tubular valve arranged adjacent said cylinder and connected to a source of ammonia gas, said valve being constructed to discharge a sheet of ammonia gas directly into contact with the porous surface of the cylinder. j

3. In a developing apparatus, the combination of two carriers, one of which is arotatable cylinder having a porous surface and the other of which comprises a belt passing partially around the cylinder, means for introducing light sensitive material between said carriers and into contact with the porous surlla face of the cylinder, and means fo occluding ammonia gas in said porous surface so as to contact said gas with the light sensitive material, said ammonia occluding means comprisinggan elongated valve comprising concentric tubes formed with slots, means for .relatively shifting the tubes to register said slots whereby said valve may discharge a sheet of ammonia gas directly into contact with the cylinder whereby the porous surface thereof may occlude the gas and means for rotating said cylinder.

4. In a device of the class described, the combination of an enclosingcabinet forming a developing chamber; means for feeding light sensitive material therethrough, and means for projecting developing gas upon said feeding means comprising concentric hollow tubes, each provided with longitudi nal slots; means for I,rotating said tubes relatively to cause said slots to register or to be adjusted out of registration; and means for connecting a source of ammonia gas to the inner hollow tube.

5. In a device of the class described, the combination of an enclosing casing; means therein for feeding light sensitive material through the casing; means for projecting ammonia gas in said casing comprising an inner hollow sleeve connected to a source of ammonia gas under pressure, and an outer hollow sleeve, said sleeves contacting through their length and having registrable slots longitudinally thereof and a handle connected to the outer sleeve for turning the latter and means for holding saidsleeves in adjusted position.`

6. In a device of the class described, the combination of a developing casing, means for feeding light sensitive material through said casing to develop the same, a ventilated casing adapted to receive the light sensitive material discharged from said developing casing, means. for conveying the light sensitive material through said Ventilating casing, means for sucking a column of air through said Ventilating casing, a receiving trough at the discharge end of said ventilated casing, said receiving trough being hollow and having its upper surface provided with a plurality of openings and a suction line connected with a hollow trough, said perforated upper surface-of the trough being constructed and arranged to receive the discharge from the ventilated casing.

7. In a device of the class described, the combination of a cabinet forming a developing chamber, a trough adapted to receive the discharge from said cabinet; means for feeding light sensitive material through said developing chamber and for discharging it from the cabinet; means in said developing chamber for subjectin the 1i ht sensitive material to the action o ammonia ases, said trough being provided with a per orated receiving surface and said perforated surface being connected to a suction exhaust whereby to suck occluded gases from said light sensitive material as it rests upon the trou h.

8. In a device of the class describe the combination of means forming a developing chamber having an outlet, means for liberating a chemically active gas in said developing chamber, means for feeding light sensitive material through the developing chamber and through the outlet of the cabinet, and a hollow trough arranged to receive the light sensitive material, the upper surface of said trough being foraminated and said hollow trough being connected with a suction line.

'9. In a device of the class described, the combination of means forming a developing vchamber having an outlet, means for feeding light sensitive material to the developing cabinet and through the outlet thereof, means including an elongated tubular valve located in said chamber for liberating a chemically' active developing gas therein and a hollow trough arranged-to receive the light sensitive material, the upper surface of said trough being foraminated and the trough being connected to a suction.

10. In a device of the class described, the combination of means forming a developing cabinet having openings for the insertion and "discharge of light sensitive material from a cabinet, a pair of cooperating carriers mountasy ed in the cabinet, one of which is a rotatable cylinder and the other of which is a belt passing around the cylinder, whereby light sensitive material may be fed along through the cabinet therebetween, means for feeding light ,sensitive material introduced through the inlet opening between said carriers whereby the

Images