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Dec. 10, 1946. . J. T. CAMPBELL 2,412,31 7 LI'IfHOGRAPHIC PLATEMAKING APPARATUS Original Filed Dec. 31,'1942 I5 Sheets-Sheet l I / l_____.__.__ __. E INVENTOR. JA M517 7? C'AN'BGAZL BY 0 Dec. 10, 1946. J, T', CAMPBELL 2,412,317 LITHOGRAPHIC PLATEMAKING APPARATUS Original Filed Dec. 51, 1942 ‘ c: o I ' I L- 3 Sheets-Sheet} 2 I ‘z. _._J INVENTOR. £015)’ 7.‘ C/IMPEZLL BY . ¢M4~44~M Dec. 10,1946. J,,T_¢AMPBEL'L_ ‘ 2,412,317 LITHOGRAPHIC PLATEMAKING APPARATUS Original Filed Dec. 31, 1942 BY 3 Sheets-Sheet 3 2,412,317 Patented Dec. 10, 1946 UNITED STATES PATENT OFFICE 2,412,317 LITHOGRAPHIC PLATEMAKIN G APPARATUS James T. Campbell, Detroit, Mich. ()riginal application December 31, 1942, Serial No. 470,871, now Patent No. 2,390,497, dated Decem ber 11, 1945. Divided and this application March 22, 1944, Serial No. 527,594 4 Claims. (CI. 95-89) 1 2 This invention relates to apparatus for making lithographic plates and more particularly to ape which is disposed within the top of the cabinet ll, being divided into a developing bath section paratus for processing lithographic plates from £5, a central wash section it, and a section I‘! for containing a ?xing solution. Suitable means are employed for controlling developed ?lm suitable for lithography and mul tilith presses and is a divisional application of my pending application entitled Lithographic plate making apparatus, ?led December 31, 1942, Serial No. 470,871, now U. S. Patent 2,390,497. Heretofore various apparatus has been em~ the temperature of the sink by heating or cooling whereby a uniform quality of work can be ob tained in the processing of exposed ?lm. A safety lamp is is indicated above the sink ployed for accomplishing this process, entailing 10 within the dark room i3 having two separately illuminated compartments covered with ruby and extensive floor space and numerous unnecessary ?ashed opal glass. A ruby glass is used for il operations, both of which the present invention lumination during developing of the exposed ?lm, has sought to eliminate. while the clear glass illumination is used for in It is the object herein to provide means for specting the ?nished negative after its develop printing a developed ?lm on a sensitized metal ment. plate and for fully processing the same for use in a printing press. ' It is the object herein to provide in combina~ ticn suitable ?lm developing apparatus disposed within a dark room, and metal plate processing means forming a part thereof but preferably dis posed outside the dark room. It is the further object herein to provide said apparatus within a suitable housing disposed An opening It is disposed below the safety light It and through the partition wall i2, whereby the developed ?lm may be transferred from the dark room to the exterior room 14 for further process ing and printing upon a metal plate, suitable closure means being employed for said opening. The developed negative is then examined and if opaquing is necessary a suitable translucent through and within a dark room wall, together 25 opaquing table is employed so that the negative may be touched up where desired. with communicating means between the dark room and the exterior whereby the developed ?lm may be transferred for further processing outside of the dark room. A blanket plate printing frame 20, later de scribed in detail and operation, hingedly mounted in cabinet H at points 2| is adapted to be nor Other objects will be seen in the following 30 mally positioned vertically within the cabinet, but also adapted to be pivoted outwardly to the speci?cation and claims describing the various dotted line position indicated at 20’ and 20". elements and their combinations as illustrated Frame 20 consists of a seamless square tubing in the accompanying drawings of which Fig. 1 is a front elevational view of the entire to provide a rectangular frame, with a resilient blanket having a heading 23 forming a part CO Cl thereof which extends around and adjacent the Fig. 2 is a right end elevational view of the outside edge of the blanket for air sealing en same. gagement with the glass frame 24. Fig. 3 is a fragmentary elevational section of An intermediate plywood or other supporting the temperature controlled sink; and Fig. ‘l is a plan view thereof on line 4—4 of 40 base 25 is provisioned within the blanket frame 20 providing a yielding support for the blanket Fig. 3. member 22 and also limiting inward movement It will be understood that said drawings illus~ thereof. Said glass frame 24 also constructed trate merely a preferable embodiment of the in of seamless square steel tubing, preferably, with vention and that it is contemplated that other embodiments are possible within the scope of the 45 a glass plate secured therein, is suitably hinged at 26 to the blanket frame 2E‘! whereby while said claims hereafter set out. glass frame may move outwardly with its sup In the drawings Fig. 1 shows the plate making porting blanket frame, it may also be tilted up~ cabinet I I which may be provisioned with hinged wardly with respect thereto. doors if desired, though not shown, which is dis Being so hinged the glass frame may remain posed with its front surface ?ush with the par in vertical position, and at the same time out tition l2 separating the camera dark room I3 printing and developing apparatus. from the exterior room M for access to said cabinet. ward movement of the blanket frame 20 is per mitted to the position indicated at 20’ with a suitable slide bracket 21 limiting the relative Said dark room normally contains the camera, and has access to the temperature controlled sink 55 movement. 2,412,317 3 On the other hand both frames as and 251 may be swung outwardly to horizontal positions on A vacuum producing source generally indicat ed at 35 is provided within the cabinet with a suitable conduit 36 connected thereto and com municating with the inner surface of the blanket frame 2% whereby air between the two frames may be withdrawn causing the blanket member 22 within the blanket frame Zr’l to tightly engage hinges 2i, and further glass frame 25; may be angularly elevated around its hinged connection 26 to permit access to the blanket frame for printing of the sensitized metal plate in the manner hereafter described. After examination of the developed negative. if opaquing is desired, the blanket frame is moved outwardly to the position shown at as’, and the sliding opaquing table 2-3 normally disposed in horizontal position within opening 3! in cabinet the glass frame and to also'bring the metal plate into contact throughout with the surface of the '1 negative therein. After the vacuum is applied between the two frames, both are raised to a vertical position II, is slid outwardly on suitable runners and with the glass frame being disposed directly in tilted downwardly to the position shown at 253'. front of the lamps 32. with its outer end resting upon the upper end of the outwardly tilted blanket frame as shown at 20’. The opaquing table consists of a steel or wood en frame of the size required with one piece of ?ashed opal and one piece of blue plate glass in serted into the frame. The inner end of the frame has provisioned thereon clasps 29 adapted for engagement with the pins 3@ at the outer edge of the opening 3i to thereby prevent the opaquing table 25 from being pulled out com pletely from the cabinet; and further to allow the table to be lowered to rest upon the upper edge of the blanket frame indicated at 23’. Frames 2% and 2d form together a vacuum con tact printing unit between which the sensitized ‘7 plate and the negative are interposed, both frames being ?rst pivoted to vertical position be fore printing, The source of illumination therefor consists of a plurality of rows of horizontally arranged lamps 32 which may be turned on by a suitable - turned on Said lamps are then a suitable switch for a sufficient time to obtain a print from the negative upon the metal plate. Thereafter both frames are low _ ered to horizontal positions, the glass frame opened and the plate removed. Both frames Zll and 24 may then be again moved back to vertical position to be disposed out of the way and entire ly within cabinet H. The metal plate is then placed upon the ink~up table 3? and developing ink applied thereto. The top of the ink-up table is made of Vitro-lite. mar ble, non-rust metal, or other similar material. Referring to Fig. l a suitable working space A is provided intermediate the ink-up table and portion 13 of the cabinet H upon which the de veloping containers l5, l6 and ii rest. Illumina tion of this space is provided by the lamp 38 de pending downwardly from the portion 13 of the cabinet ii. Developing and ?xing trays i5 and as illustrated in Figures 1 and 2 are positioned within sink B with their bottom portions rest ing upon the bottom of said sink. On the other timing switch hereafter described. hand, central wash tray [5 is positioned with its However for opaquing work the source of light bottom surface above the level of the ?uid in is the same i. e. the lamps 32, whereby illumina sink B as illustrated in Figure l, and is main tion passing through the glass frame 263 is sup 40 tained in said position by its front and rear lip plied to the surface of the opaquing table shown portions which rest upon sink B in the manner in the position 28', whereby the negative thereon may be suitably opaqued or touched up where re quired. After opaquing the negative the opaquing ta ble 28 is then slid back into horizontal position Within opening 3! in cabinet H, and also the blanket frame ‘id is tilted back into vertical po sition. A plate whirler 53 is encased in the drawer 34 within cabinet I I, or may be installed on a swivel table; but in any event is adapted to be slid or swiveled forward outside of the cabinet for re ceiving the metal plate. Said metal plate is ?owed or covered with a illustrated in FiguregZ.) Space A within cabinet H also provides access to the plate developing sink 39 within which the printed plate after inking-up is placed for water flushing thereon until fully developed. After de velopment the plate is dried, processed and then it is ready to be used in a printing press for lith ographic printing. The plate making sink is made of selected wood or non-rust metal, and has provisioned adjacent its rear upper edge a suitable ?ushing pipe at, perforated throughout its length as indicated at £5 to provide a continuous water supply cascad ing dovm over the printed metal plate lying upon the inclined water rack (“32 within the developing suitable sensitizer and then returned to its ini tial position within the cabinet, where it is prop sink 3%. Water is supplied through the pipe 63 erly whirled to evenly spread the sensitizer and from a suitable exterior source for fluid commu to thoroughly dry the same upon the plate. nication with ?ushing pipe 533, there being a suit Thereafter the whirler is brought forward to re 60 able manually operable quick acting gate Valve move the plate, and immediately returned to its interposed at M, ' initial position out of the way within the cabinet. An instrument panel board £55, shown in Fig. 1 Also attached to plate whirler 83 is a rheostat on the front of cabinet H between the printing for variable speed and an electric heating ele frame 2i! and plate whirler 33, is exterior to the ment to dry the solution. _ dark room 13 with an electric interval timer 135 The blanket frames 2d and 2d are lowered to for the vacuum printer. It is understood that horizontal position by means of hinges 2i and the for printing from the negative upon a sensitized glass section Ell is separately raised on its hinges plate within the printing frames, that the lights 26 and held in position by the slide bracket 27. 32 are on only for a short predetermined interval. The metal plate is then placed on the blanket 22 Timer it provides manual means for regulating and the negative properly positioned upon the this interval of exposure. now sensitized surface of said plate. The glass A three-way manual valve it? is shown for en frame 25 is again lowered until its glass portion gaging and releasing the vacuum from they vac contacts the rectangular beading 23 thereby pro uum source 35 to the blanket frame 20 through viding an air tight seal between the twov frames. conduit 36. It will be understood that vacuum 2,412,317 5 is required only after the blanket frame 20 and glass frame 24 are brought together with the sen sitized plate and negative disposed therebetween. if the temperature of the fluid sink B rises to, for example 67 degrees F. Valve 41 also permits a quick release of the vac On the other hand in a cool or cold climate thermostat switch 65 may be set also for main uum after the printing operation by allowing air taining the water in sink B at approximately 65 to rush in between the blanket frame and the degrees F., being set to operate when the temper ature drops to approximately 63 degrees F. printing frame, whereby said printing frames may be quickly opened, saving considerable time heretofore lost. It will be noted that both thermostats are so coupled together that by a suitable shaft or lever A manual switch d8 is shown on the panel board 10 a temperature adjustment of one automatically for operating vacuum pump 35 as and when de adjusts the other for the same temperature. sired. Likewise a manual switch 49 is shown for This guarantees that only one unit, refrigerating turning on and oif printing lamps 32 within the or heating, will be operative at one time. Fur cabinet H which are disposed in parallel rela ther such a coupling between the two thermo tion directly behind the glass printing frame 24. 15 stats eliminates the trouble and di?iculty of sep The vacuum gauge 5%] is indicated for visual arately adjusting both. So arranged, an ad measurement of the amount of vacuum desired justment of one, causes an automatic tempera for the printing operation, and for determining ture setting of the other. The cabinet housing ii therefore provides a said operation. 20 compact lithograph ?lm developing and plate The ?lm developing sink B with trays I5, Iii making unit, and is intended essentially for con and I‘! has been previously referred to as tem serving ?ocr space, time, and numerous steps. perature regulated by refrigerator as well as Heretofore any one of the units above de heating means. The refrigerator unit is gen scribed, as for instance the negative developing erally indicated diagrammatically at El within sink, or the plate developing sink, or the print the storage compartment 52 in the bottom of ing mechanism occupied the space now occupied cabinet I I, and is suitably connected by conduits by the entire cabinet, effecting a space saving of 53 to the flat refrigerator coils 5A which are sol approximately 89 percent. This feature is im dered or otherwise secured to the under surface portant particularly when the unit is employed whether said vacuum is maintained throughout of sink 13, providing an intimate heat conducting -~ contact therewith whereby a temperature regu lated fluid may be circulated to maintain a pre determined temperature of the water within sink 13 within which the developing and ?xing trays are partially immersed. A separate electrical heating cable 55, prefer ably a lead covered wire, is also provisioned in coils against the bottom surface of sink B be tween and co-extensive with the refrigerator coils 54, where by thermostatic control, the tem perature of the water within sink B can be accu rately maintained. Insulating material 56 preferably cork and rock wool is then provisioned entirely around sink B, lge'ing disposed within the compartment member The central wash tray I6 is supplied continu ously, when in use, with a fresh water source 58, on ships or upon or adjacent the battle ?eld. A storage compartment 66 is shown in Fig, 1 whichmay be accessible from both sides of the cabinet. An additional ?lm storage compart ment 6? is shown within the lower portion of the cabinet l I accessible from the dark room. It will be noted that the dark room partition or wall I2 is built snugly around the sink so that while the ?lm developing sink B is entirely with in the dark room, the plate making units above described are accessible from the room exterior thereto. For one man operation all apparatus could be installed within housing cabinet ii to open out wardly below the front section of said sink but en , tirely within the dark room whereby all process ing could be accomplished therein conveniently. ' It will be seen from the drawings that all appa ratus above described is enclosed within the cabi there being an overflow stand pipe 59 within said tray I6 for maintaining the level of water there in. Said stand pipe is threaded into the exten sion pipe 60 which downwardly depends below tray It to be removably inserted within the sink stand pipe 6|. net ?ush with either the front or rear thereof so Stand pipe 59 is removable permitting flushing and cleaning of tray it. Its extension 60 is should now be had to the claims which follow for determining the scope thereof. I claim: adapted to provide a ?uid drain connection with the sink stand pipe so as not to disturb the cooled water in sink B. It will be noted also that stand that when not in use, suitable doors, not shown in the drawings, may be closed to keep all appa ratus clean, and further to present a neat appear ing cabinet occupying a very minimum of space. Having described my invention, reference 1. Apparatus for processing exposed film for the making of lithographic plates comprising a pipe BI is removable permitting ?ushing out of 60 cabinet housing with one edge built within and sink B when desired. forming a part of a dark room wall, an insulated A drain connecting pipe 63 is adapted for threaded connection with the sink drain pipe 62, pipe 62 extending through the insulating com partment 56 for communication with a suitable sewer drain 63. Thermostatic controls 64 and 65 are shown in support on said cabinet within said dark room, a temperature controlled sink nested within said insulated support, developing and ?xing bath trays supported upon and partially immersed within said sink within a fluid therein, a cooling coil secured to the bottom of said sink, a heat instrument panel 45 for operating and regulating ing coil also on the bottom of said sink adjacent the refrigerator and heating units respectively said cooling coil, a washing tray supported upon whereby the developing sink B may be constantly 70 and disposed within said sink with its under sur maintained at any desired predetermined tem face above the level of ?uid therein, a fluid perature. For instance in a warm climate ther source to said washing tray, a water level main taining stand pipe in said wash tray, a water level mostat control E54 may be set to warm the water stand pipe in said sink, axially aligned and inter within sink B to approximately 65 degrees F., and so adjusted as to actuate the refrigerator unit 5| 75 connected with said wash tray stand pipe, and a 2,412,317 8 drain pipe joined to said sink stand pipe and dis posed through said insulated support for con ducting ?uid from said wash tray independent or" the ?uid within said sink. 2. Apparatus for processing exposed ?lm for the making of lithographic plates comprising a cabinet housing with one edge built within and therein, a cooling coil secured to the bottom of said sink, a heating coil also on the bottom of said sink adjacent said cooling coil, a washing tray supported upon and disposed within said sink above the level of ?uid therein, a fluid source to said Washing tray, a removable stand pipe in said wash tray, a drain pipe extending below the bot forming a part of a dark room wall, an insulated tom thereof, a stand pipe in said sink, into which support on said cabinet Within said dark room, said wash tray drain may be removably inserted a temperature controlled sink nested Within said 10 in axial alignment, and a second drain pipe joined insulated support, developing and ?xing bath trays supported upon and partially immersed within said sink within a ?uid therein, a cooling coil secured to the bottom of said sink, a heating to said sink stand pipe and disposed through said sink and said insulated support for conducting ?uid from said wash tray independent of the ?uid within said sink. coil also on the bottom of said sink adjacent said 15 4. Apparatus for processing exposed ?lm for coolingr coil’, a washing tray supported upon and the making of lithographic plates comprising an disposed within said sink with its under surface insulated support, a temperature controlled sink above the level of fluid therein, a ?uid source to nested within said insulated support, developing said washing tray, a removable stand pipe in said and ?xing bath‘ trays supported uponand par wash tray, a drain pipe extending below the bot 20 tially immersed Within said sink within a ?uid tom thereof, a stand pipe in said sink, into which therein, a washing tray supported upon and dis said Wash tray drain may be removably inserted posed Within said sink with its under surface in axial alignment, and a second drain pipe above the level of ?uid therein, a ?uid source joined, to said sink stand pipe and disposed to said washing tray, a removable stand pipe in through said sink and said insulated support for 25 said wash tray, a drain pipe extending below the conducting ?uid from said wash tray independent bottom thereof, a stand pipe in said sink, into of the ?uid within said sink. which said wash tray drain may be removably 3. Apparatus for processing exposed ?lm for the inserted, and a second drain pipe joined to said making of lithographic plates comprising an in sink stand pipe and disposed through said sink sulated support, a temperature controlled sink 30 and said insulated support for conducting ?uid nested within said insulated support, developing from said wash tray independent of the ?uid and ?xing bath trays supported upon and par within said sink. tially immersed within said sink within a ?uid JAMES T. CAMPBELL.