US1225729A

US1225729A - Photographic-printing machine.

Info

Publication number: US1225729A
Application number: US84534714A
Authority: US
Inventors: John H Fullmer; Robert W Runser
Original assignee: HUEBNER BLEISTEIN PATENTS Co
Current assignee: HUEBNER-BLEISTEIN PATENTS Co; HUEBNER BLEISTEIN PATENTS Co
Priority date: 1914-06-16
Filing date: 1914-06-16
Publication date: 1917-05-08
Anticipated expiration: 1934-05-08

Description

J. H. FULLMER & R. W. RUNSER.

PHOTOGRAPHIC PRINTING MACHINE.

APPLICATION FILED JUNE 16. 1914.

Patented May 8, 1917.

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5 4 MUM J. H. FULLMER & R. W. RUNSER.

PHOTOGRAPHIC PRINTING MACHINE.

APPLICATlON FlLED JUNE 16. 1914.

1,225,729. Patented May 8,1917.

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J. FULLMER & R. W. RUNSER. PHOTOGRAPHIC PRINTING MACHINE.

APPLICATION FILED JUNE 16, 1914- 1,225,729. Patented May 8, 1917.

, 5 SHEETS-SHEET 3.

J. H. FULLMER & R. W. RUNSER.

PHOTOGRAPHIC PRINTING MACHINE,

Patented May 8, 1917.

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UNITED STATES PATENT OFFICE.

JOHN H. FULLMER AND ROBERT w. RUNSEI OF BUrrAn Ew YORK, AssIeNons T0 HUnBNnaB EIsrE P TENTS cOMPANY, or BUFFALO, NEW yonn, A QORIORA- TION or EW Y rno'roenArnio-rniNriNe MACHINE.

- Specification of Letters IPatent.

Patented May 8, 1917.

Application filed. June 16, 1914. Serial No. 345,347.

T 0 all rv/ 20m it may, concern:

Be it known that we, JOHN H. FULLMEP. and ROBERT W. RUNSER, citizens of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Photo graphic-Printing Machines, of which the following is a specification.

This invention relates tov a photographic printing machine which is adapted to produce photographic impressions or prints upon sensitized surfaces which are subse quently finished for use in producing printed matter of different colors..-

ln machines of this character as heretofore constructed the organization of the parts was such that the'm'eans for supporting the printing plate, the sensitized surfaces and the pressing devices had to he made unduly heavy in order to reduce the liability of the weight of the parts from distorting the machine and interfering with the registration of the printing platerelative to the sensitized surface which would result in imperfect work. The'parts of the prior machines were also so arranged that the insertion of. the print: ing plate support into the machine and the removal of the same therefrom was inconvenient and laborious and required much time in 'etting the machine ready for work. Furthermore, the sensitized surface was so mounted in the machine that dust, dirt or other foreign matter was liable to gather on the sensitized surface and result in the production of imperfect printing plates.

It is the object of this invention to produce a n achine of this character of comparatively simple construction and of low cost in which the printing plate supporting devices, the sensitized surface support and the pressing devices are so mounted tlia't'the' weight of these parts is not liable to disturb the register of the printing plate and the sensitized surface relatively. to each other, also to permit these parts to be readily manipulated without undue exertion or labor-o'n the part of the operator and'also to prevent any" partly in section. Fig. 8 is a fragmentary vertical. transverse section, on an enlarged scale, showing the means for supporting the printing plate and sensitized surface and associated parts.

fragmentary side elevation, on an enlarged scale of the means for positionlng the printmg plate and sensitized surface horizontally one relatively to the other. Fig. 6 is a fragmentary vertical longitudinal section, on an enlarged -scale,.taken 1n lme 66, Fig. 5. T

Fig. 7 1s a fragmentary ho'izontal section taken in line 77, Fig. 3, showing the means the same. This member may be of any suitable character and material, that shown in the drawings, for example having the form of. a plate or sheet which may be constructed of aluminum, zinc or other metal. This scnsitized sheet orplate is preferably so mounted in the machine that the main part of t is same is arranged horizontally or substantially so and has the sensitized surface on the underside thereof so that this surface faces downwardly. Due to this arrangement of the sensitized plate any dust, dirt or other objectionable matter from any other source can only lodge on the upper or back side of the sensitized plate or sheetwliere the same can do no harm but is prevented from lodging on the underside of this plate bearing the sensitized coating, ther eby preventing spoiling of the same and insuring the production of perfect printingfrom thjisplate.

2 represents the transparent printing plate which may be constructed of any suitable material either as a positive or as a negative and from which photographic prints or impressions may be produced on the sensitized underside of the print receiving Fig. l is a horizontal sec- 'tl-OIl takenv in line li, Flg. 1. Fig. 5 is a member by placing this transparent printing plate in engagement with the underside of the print receiving member and causing light rays to pass upwardly to the printing plate and act upon the sensitized surface.

8 represents a contact block or supporting platen which is adapted to be pressed against the upper back side or unsensitized surface of the print-receiving member 013-- posite the place where the sensitized sur face of the same is enga ed by the printing plate during the operation of producing an impression. The underside of the platen is preferably provided with a facing or cushion 4: of felt or similar yielding material which permits the pressure of the platen to be distributed uniformly over the back of the sensitized plate.

The means whereby this sensitized plate, the printing plate and the supporting block or platen are supported and moved relatively to each other in accordance with our invention comprise means whereby the printing plate may be moved vertically to ward and from the sensitized underside of the print receiving plate, means for moving the impression block vertically toward and from the upper side of the print receiving plate, and means for moving the print re ceiving plate both in a lengthwise and a transverse direction horizontally between the printing plate and supporting block for the purpose of permitting an impression of the printing plate to be produced on various parts of the sensitized surface of the print receiving plate. The means for thus supporting the print receiving plate are constructed as follows:

5, '6 represent two stationary horizontal guide rails or tracks arranged parallel and lengthwise of the machine and supported at a suitable distance from the ground or floor by means of upright posts or columns 7, as shown in Figs. 1 and 2 or in any other suitable way. Upon these tracks is mounted a horizontally and longitudinally slid able primary carriage which preferably comprises two

longitudinal slides

8, 9 engaging with the upper sides of the front and rear longitudinal guideways or tracks, and two horizontal

transverse bars

10, 10 arranged parallel and connecting the corresponding ends of the front and

rear slides

8, 9. The longitudinal movement of this yn'iinary carriage may be effected by various means those shown in the drawings being suitable and comprising two longitudinal gear racks 11, 11 secured to the opposing inner sides of the longitudinal tracks or rails, a transverse horizontal shaft 12 journaled in suitable bearings at one end of the primary carriage, preferably the left hand end thereof, and provided at its opposite ends with

gear wheels

13, 13 meshing respectively with the gear racks ll, 11, a

hand crank ll journaled on a bracket 15 secured to lhe left hand end of the primary carriage, and a train of gear wheels for transmitting the movement of this crank to the transverse shaft 12 and comprising a driving gear wheel 16 turning with the hand crank 14, and an intermediate gear wheel 17 pivoted on the bracket 15 and meshing with the driving gear wheel 16 and the ad jacent gear wheel 13 of the transverse shaft.

Upon. the primary carriage is mounted a horizontally and transvei ly slidable secondary carriage which pronv ably comprises two horizontal

transverse bars

18, 18 and two

longitudinal bars

19, 19 which connect the corresponding ends of the transverse bars, and two

slides

20, 20 secured to the urulersides of the transverse bars 18 and engaging with

transverse tracks

21, 21 on the upper sides of the

transverse bars

10, 10 so that the secondary carriage is capable of moving horizontally and transversely on the primary carriage and is also incapable of moving lengthwise with the latter, whereby the print receiving member mounted on u the secondary carriage is capable of moving in two directions at right angles to each other. Each of the bars of the secondary carriage is preferably constructed of an angle iron having a lower horizontal flange and an upper vertical flange projecting upwardly from the cute" edge of the horizontal flange, as shown in Figs. 1, 6 and 10. The secondary carriage may also be operated by various means, those shown in the drawings being suitable and comprising a horizontal gear rack 2i secured transversely to the left hand track of the primary carriage, a gear wheel pivotally mounted on the secondary carriage and interi'neshing with the teeth of the gear rack 2i and a hand crank 26 connected with the gear wheel Upon turning the crank l-fl, in one direction or the other the primary carriage together with the secondary carriage are moved to gether in a direction lengthwise of the machine vvhile upon turning the crank 26 in one direction or the other the secondary carriage may be moved forwardly or backwardly horizontally in a direction transversely of the machine.

l Vithin the transversely movable carriage is mounted a rack which carries the sensitized plate or member. In its preferred form this rack comprises a frame having two transverse parallel bars 27 and two longitudinal bars 28 which connect corresponding ends of the transverse bars. Each of the bars of this rack frame is preferably of channel-shaped form in cross section with its concave side facing inwardly and the transverse bars of this frame rest with their lower flanges against the lower transverse flanges of the secondary carriage While the webs of these bars engage the inner sides of the vertical webs of the transverse bars of the secondary carriage. This rack frame may be held in a definite centered position in the secondary carriage by any suitable means but preferably by means of clamping screws 29 arranged in the vertical webs of the transverse bars 18 of the secondary carriage and engaging with the transversebars 27 of the rack f 'ame, as shown in Figs. 2 and 6. represents two stretching or supporting bars arranged transversely within the rack frame adjacent to opposite ends thereof and each provided at its opposite ends with upper and lower lugs 31 forming a fork which embraces the upper and lower flanges of the adjacent channel-shaped longitudinal rack frame bar. Each of these stretching bars may be adjusted bodily on the rack frame in a direction lengthwise of the machine by means of adjusting pins 32 extending vertically through openings in the forks and through one or another pair of openings 33 formed in longitudinal rows in the upper and lower flanges of the longitudinal bars 28 of the rack frame, as shown in Figs. 1 and 2. The sensitized impression receiving plate is detachably secured at its opposite transverse edges to the stretching bars by means which permit of drawing this plate perfectly taut and holding the same in an even and horizontal position while photo graphic impressions are produced on the sensitized surface thereof and the same is shifted for presenting different portions of its sensitized surface to the printing position. Although various means may be employed for connecting the. sensitized plate with the stretching bars those shown in the drawings are suitable and comprise a plurality of clamps each of which has a clamp ing arm 3% pivoted at its upper end on the adjacent stretching bar so as to be capable of swinging in a vertical plane and pro vided with a relatively fixed gripping jaw 35 which is adapted to engage with one side of the adjacent edge portion of the print receiving plate, a relatively movable gripping j aw 36 engaging with the opposite side of the print receiving plate and connected by means of a screw 37 with the companion fixed jaw, and a tightening screw 38 arranged in the arm 84 and engaging with the adjacent vertical web of the companion stretching bar, as shown in Fig. 10. By shifting the stretching bars toward or from each other within the frame of the rack and securing the same in their adjusted position by means of the pins 82 it is possible to adapt the rack to print receiving plates varying in length. i

In order to permit of definitely register ing the print receiving plate relatively to the printing plate and the impression block suitable stop devices and indicators may be employed those shown in the drawings, for

example, consisting of a stop block 39 arranged on one of the transverse bars of the secondary carriage and adapted to engage with a micrometer screw i0 mounted on the primary carriage, and a stop block il arranged on the primary carriage and adapted to engage with a micrometer screw 42 on the stationary part of the machine. it coarse adjustment of the secondary carriage relatively to the primary carriage may be effected by providing a bracket which carries the micrometer screw lO and which is adapted to be secured at different points in the length of the transverse gear rack 2- by means of pins 1 1 passing through openings in the bracket 4:3 and different pairs of openings 45 formed in a longitudinal row in the transverse gear rack, as shown in Figs. 5 and 6. The openings 4L5 are spaced regularly and preferably suitably numbered so that they can be readily selected to secure the bracket 13 in the desired place on the transverse gear rack for obtaining the coarse adjustment of the relation of the secondary carriage after which the exact adjustment of these parts may be effected by turning the micrometer screw 40 to the desired position and then shifting the second ary carriage so that its stop 89 engages this screw. The micrometer screw 42 may be similarly secured to a longitudinal bar 16 on the main frame for roughly positioning this micrometer screw relatively to the primary carriage after which the last mentioned micrometer screw may be adjusted so that upon shifting the primary carriage until its stop 41 engages with this screw these parts will be in their proper relative position for bringing the desired part of the print receiving plate to the printing point. As shown in Figs. 2 and 10 the micrometer screw as is mounted on a bracket 17 which may be adjusted lengthwise on the bar 46 by passing pins 18 through the bracket l? and different pairs of openings -29 formed in a longitudinal row in the bar 46.

Themeans for supporting and operating the transparent printing plate are constructed as follows 50 represents a comparatively thick and strong transparent supporting plate which is arranged horizontally and supports the printing plate on its upper side. This transparent supporting plate is preferably con structed of glass and rests upon the upper side of a horizontal printing frame 51 preferably constructed of metal. This printi frame is provided. with a central openin 52 which is covered by the transparent supporting plate and which is of substantially the same size or dimensions as the transparent printing plate so that the design on the printing plate may be transferred or impressed upon the sensitized underside of the print receiving plate by means of the light of a lamp 53 arranged below the opening of the supporting plate. The transparent supporting plate is held against horizontal displacement on the supporting frame by means of a plurality of cleats 5 secured to the upper side of the printing frame and engaging with the corners of the transparent supporting plate and a plurality of retaining blocks secured to the upperside of the printing frame in position to engage with the central parts of the four edges of the supporting plate which is preferably square, as shown in Figs. 1, 3, S and 10. The transparent printing plate is held in place on the upper side of the transparent supporting plate by means of a plurality of clamping devices each of which has a aw 56 guided in a way 57 formed in the upper part of one of the retaining blocks and has its inner part projecting over the top of the transparent supporting plate and engaging with the adjacent edge of the printing plate, as shown in Fig. 3. Each of the clamping jaws may be moved radially inward and outward by any suitable means those shown in the drawings being suitable and comprising a clamping screw 58 journaled on the outer end of the companion jaw so as to be capable of turning therein but incapable of axial movement relatively thereto and engaging its inner screw threaded portion with a threaded opening in the adjacent retaining block while its outer end is provided with a linger piece or button 60 for turning the same. Upon turning the clamping screw in one direction or the other the clamping jaw is moved inwardly or outwardly for securing the transparent supporting and printing plates in position for releasing the same.

In the operative position of the transparent supporting and printing plates and the frame which carries the same are arranged in the upper end of a light chamber or lamp box 61 which is open at the top and pro vided in its lower part with an illuminating device of any suitable character but preferably an electric lamp 53, as shown in Figs. 1 and 10. This light chamber is provided with means which permit of readily inserting the printing frame and associated parts into the light chamber preparatory to performing the printing operation and also removing this frame from the front side of the machine, which means are also preferably so constructed that they may be utilized for moving the printing plate and associated parts toward and from the sensitized underside of the print receiving plate. In order to thus permit the printing frame to be introduced into the upper part of the light chamber from the front side thereof the upper edge of the front wall 62 of this chamber is cut down so as to form a passageway, as shown at 63 in Fig. 1, while the remaining three walls 64: of this chamber which is of rectangular form, extend upwardly above the front wall and to a point which is preferably on a line with the upper side of the printing frame and thereby serve to confine the printing frame against further forward movement in the light cham ber as well as against lateral movement therein. The raising and lowering of the printing frame and the parts mounted thereon is preferably effected by a plurality of vertically rotating eccentrics or cams 65 engaging the underside of the printing frame and mounted in two sets on two longitudinal shafts 66 which are journaled horizontally in suitable bearings on the upper part of the light chamber. Upon turning these cam shafts so that the low portions of the cams are uppermost, the printing frame and the parts mounted thereon are in their lowered position and the printing plate is out of contact with the underside of the sensitized print receiving plate but 'upon turning the cam shafts so that the high parts of the cams are uppermost the printing frame will be raised so that the printing plate is pressed firmly into contact with the sensitized surface of the print receiving plate. While raising and lowering the printing frame a light tight joint is maintained between the same and the lamp box by engagement of the rear and side edges of the printing frame with the adjacent rear and side walls of the lamp box and by a depending shutter flange 107 10g arranged on the front edge of the printing frame and engaging with the outer side of the front wall of the lamp box, as shown in Figs. 1, 3 and 8. The turning of the cam shafts may be effected by any suitable means 1 5 so that they operate in unison, the means for this purpose shown in the drawings beingsuitable and comprising two rock arms 67 secured to corresponding ends of the cam shafts and having their opposing inner ends 1 provided with longitudinal slots 68 and overlapping each other, a clamping screw 69 passing through the slots 68 and bearing with its head at the outer end thereof against the outer side of one of the rock 115 arms, and a screw nut 70 mounted on the threaded inner end of the clamping screw and adapted to slide vertically in an undercut guideway 71 arranged on the adjacent wall of the light chamber. Upon loosening 120 the clamping screw 69 and moving the same together with its nut downwardly in the guideway 71 the rock arms 67 will be low ered, as shown by dotted lines in Fig. 3, and the cams will be turned so that the 25 printing plate will be lowered out of engagement from the print receiving plate. Upon raising the clamping screw 69 in the guideway 71 until the rock arms 67 are in a horizontal position, as shown by full lines 130 FUN in Fig. 2, the cams will be turned so as to press the printing plate against the sensitised surface of the print receiving plate. Upon tightening the screw 69 the parts will be held in their adjusted position.

The transparent supporting and printing plates are usually mounted on the printing frame while these parts are removed from the printing machine inasmuch as this can be done at this time more conveniently and expeditiously. It is also desirable in order to get the best results to provide different printing frames for different sizes of printing plates, each printing frame having an opening corresponding to the size or dimensions of the printing plate which is used for producing impressions on the sensitized surface. In order therefore to permit the op erators to conveniently insert the assembled printing frame and transparent supporting and printing plates into the lamp box as well as removing the same therefrom the distance from the ground or floor to the top of the lamp box is substantially equal to the breast height of a man. This will enable two men to easily handle the printing frame and the parts associated therewith while in troducing or removing the same from the machine without unduly straining the operatives or liability of displacing the parts notwithstanding that this printing frame and associated parts are very heavy.

in order to permit of producing impressions of the printing plate at an angle on the sensitized surface for the purpose of economizing space and material for certain classes of work, the lamp box or light cha1rher is so mounted that it is capable of rotating horizontally about a vertical axis together with the parts mounted thereon. The preferred means for accomplishing this purpose consists in mounting the bottom of the light chamber on a table 72 which rests upon a supporting shelf 73 forming the upper part of a fixed base 74 wh ch rests upon the floor or ground, and provlding the table with a depending cylindrical arbor or pivot 75 which is journaledin a vertical bearing 76 formed in the adjacent part of the be se and its shelf. The axis of the pivot 75 is vertically in line with the opening in the printing frame and the printing plate, w iereby upon turning the light chamber horizontally the printing plate will be presented at an, angle to the sensitized surface of the print receiving plate. After the light chamber and associated parts have been ad justcd horizontally about the axis of this chamber to the desired position these parts are held against displacement by clamping means which preferably consist in provich ing the base with clamping lugs 77 on opposite sides of a vertical radial slot or split 79 formed in this base and extending from the bore ofits bearing to-the periphery of the base, a right and left hand clamping screw 78 engaging its opposite ends with correspondingly threaded screw nuts 80 mounted on the clamping lugs, and a handle 81 connected with the central part of the clamping screw, as shown in Figs. 1 and 41. Upon turning the clamping screw 7 8 in one direction the split portions of the base are loosened to release the pivot 75 and permit the light chamber and the parts mounted thereon to be turned horizontally into the desired position after which the turning of the clamping screw in the opposite direction will cause the split parts of the base to grip the pivot 75 and hold these parts in the adjusted position.

Means are provided for raising and lowering the back supporting block or platen.

3, also for turning the same horizontally to suit the position of the printing plate and associated parts and also to permit of removing this bloclr from the machine so that it may be exchanged for one of larger or smaller dimensions to suit the size of the printing plate of which impressions are be-- ing produced on the sensitized surface. The preferred means shown in the drawings for thus operating the supporting block are constructed as follows:

82 represents a supporting arm projecting upwardly and forwardly from the rear part of the base so as to overhang the supporting block, primary and secondary carriages the light chamber and associated parts. In its front end the supporting arm is provided with a vertical guideway 83 which is axially inline with the bearing in the base and in which an upright shank 84: is adapted to slide vertically. The vertical move ment of this shank in this guideway may be effected by various means those, for examp e, shown in the drawings being suitable and comprising a horizontal shaft 85 journaled on. the supporting arm in rear of he guideway 83 and provided at its opposite ends with two gear wheels 86 which mesh with two gear racks 87 arranged verticall on the adjacent rear part of the guide shanlr 8t, and a horizontal operating shaft 88 journaled transversely in suitable hearings on the arm 82 and provided at its front or inner end with a worm 89 which meshes with a worm wheel 90 on the central part of the shaft 85 while its outer or rear end is provided with a handle 91 for turn ing the'operating shaft, as shown in Figs. 1 and 2. By this means the sliding shank may be raised and lowered but the same is held against turning by engagement of the gear racks with shoulders 92 formed on the supporting aim adjacent to opposite sides of the gear racks.

Arranged axially with the guide ali is a rertical pivot i ieh is capab turning horizontally in. a

and which is provided at its lower end with a supporting head 95 engaging with the lower end of the guide shank while its upper end is provided with a clamping screw nut 96 engaging with the upper end of the guide shank for holding these parts in position relatively to each other after adjustment. On its underside the supporting head 95 is provided at its opposite edges with two horizontal parallel guide grooves 22 which have their concave sides facing each other and which receive parallel horizontal flanges or guide flanges 97 formed on the upper part of the supporting block adjacent to opposite edges thereof. By means of these guide flanges and grooves the supporting block may be readily attached to or removed from the supporting head and interchanged for one of larger or smaller dimensions to suit the size of the printing plate which is being used and by raising or lowering the shank together with the parts mounted thereon the cushioned underside of the supporting block may be either pressed against the back or unsensitized surface of the print receiving plate for reliably supporting the latter during the printing operation, or withdrawing therefrom so as to free the print receiving plate and permit the same to be shifted horizontally into the desired position.

In order to permit of readily and accurately adjusting the printing plate, the supporting block and associated parts, so that they occupy the same position relatively to the sensitized. surface, indicating means are provided which may be variously constructed but which preferably comprise a pointer or mark 98 formed on the edge of the supporting table 72 and adapted to traverse a scale or row of graduations 99 on the adjacent edge of the shelf 73 and a mark or pointer 100 is arranged on the edge of the supporting head 95 and adapted to traverse a scale or row of graduations 101 arranged on a flange 102 formed on the lower end of the guide shank 84, as shown in Figs. 1 and 3.

Means are provided for withdrawing the hot air forcibly from the interior of the light chamber and admitting fresh, cool air into the interior of the same, so as to prevent the light chamber and associated parts from becoming unduly heated by the lamp within the light chamber. Various means may be employed for this purpose, those, for example, which are shown in the drawings comprising a plurality of perforated outlet pipes 103 mounted within the upper part of the light chamber, an exhaust fan or blower 104C arranged on a suitable support outside of the light chamber and having its eye connected with the perforated outlet pipes by a conduit which contains a flexible section 105 so as to permit the light chamber to be adjusted horizontally about. its vertical axis.

The external cool air may be admitted to the light chamber in various ways, for instance, through an opening or passage 106 leading from the bottom of the light chamber downwardly through the lower vertical pivot 75 to the exterior of the machine, where suitable provision may be made so that the light from the lamp in the light chamber ".vill not act upon the sensitized surface of thg print receiving member which is exposed outside of the light chamber.

In the operation of this machine the printing frame carrying the transparent supporting and printing plates is introduced into the upper end of the light chamber while the cams 65 are lowered and the supporting block is elevated to its highest position thereby allowing the operators ample room for properly manipulating the printing frame and associated parts. In the lowered position of the printing plate the same rests on ledges 59 on the upper end of the lamp box.

The printing rack carrying the sensitized print receiving plate is now placed within the secondary carriage and secured thereto in the proper position between the printing plate and the back supporting plate. The primary and secondary carriages are now shifted horizontally relatively to each other and to the main frame for bringing the de sired part of the sensitized surface of the print-receiving plate in line with the print ing plate and the supporting block after which the cams 65 are turned so as to raise the printing plate into contact with the sensitized surface and the back supporting block or platen is lowered so as to press firmly against the back of the print receiving plate opposite the printing plate. The light is now turned on within the lamp chamber or light box whereby a photo graphic impression of the printing plate is produced on the sensitized surface. After the printing plate has been exposed to this light a sufiicient length of time while in engagement with the sensitized surface the light is turned off, the back supporting plate is raised and the printing frame is lowered, thereby leaving the sensitized plate free to be shifted horizontally in any direction for presenting any other desired part of the sensitized surface to the printing position, this universal horizontal movement of the sensitized member being possible by reason of the primary carriage being movable lengthwise and the secondary carriage being movable transversely relatively to each other and to the stationary parts of the frame.

It will be noted that this machine is comparatively simple in construction and easy of manipulation that the weight of the movable parts is so taken up that no parts are strained and possibly interfere with the accuracy of the printing operation, that the same is compact in construction and requires a minimum. of effort on the part of the operatives to n'ianipulate the different working parts and that the sensitized surface of the print receiving member is not liable to be marred or injured by the lodging of dust or dirt particles on the same, thereby permitting the production of accurate and perfect printing pla at a minimum of cost.

We claim as our invention:

1. A, photographic printing machine comprising a main rame, a primary carriage movable horizontally in one direction on said frame, a secondary carriage movable horizontally on said primary carriage, meansfor supporting a sensitized member on said secondary carriage, comprising a rack having a frame detachably mounted on thesecondary carriage, and stretching bars adjustably mounted on said frame and adapted to be connected with said sensitized member, and means for producing photographic impressions on said sensitized member.

2. A photographic printing machine comprising a main frame, a primary carriage movable horizontally in one direction on said frame, a secondary carriage movable horizontally on said primary carriage, means for supporting a sensitized member on said secondary carriage, comprising a rack having a frame detachably mounted on the secondary carriage and provided with parallel rows of openings in two of its bars, parallel stretching bars each provided at its ends with perforated lugs engaging said perforated bars, pins passing through the openings in said lugs and perforated bars, and clamps mounted on said stretching bars and adapted to grip said sensitized members.

3. A photographic printing machine comprising means for supporting a member having a sensitized surface, a transparent printing plate aca-pted to engage said sensi tized surface, a frame on which'said plate is mounted, means for moving said frame toward said member comprising a plurality of cams engaging said frame, and means for operating said cams simultaneously comprising rock shafts on which said cams are mounted, rock arms secured to said shafts, a relatively fixed guide arranged between said shafts and a clamping device slidable on said guide and adjustably connected with both of said arms. 1

4-; A photographic printingmachine com prising a m in frame, a primary carriage movable horizontally in one direction on said frame, a secondary carriage movable horizontally on said primary carriage, means for supporting a sensitized member on said secondary carriage, a'transparent printing plate adapted to engage the sensitized surface of said member and a supporting block port a printing plate, a light chamber adapted to engage the unsensitized surface of said member, means for moving said plate and block toward and from opposite sides of said member, and means for rotat ing said plate and block in planes parallel. with the surfaces of said sensitized member.

5. A photographic printing machine comprising means for supporting a member having a sensitized surface, printing plate, a printing frame supporting said printing plate, and a light chamber having its upper end open and adapted to receive said printing frame and having the upper part of one of its walls provided with a passageway through which the printing frame and associated parts may be moved horizontally into and out of said light chamber.

G. A photographic printing machine comprising means for supporting a member having a sensitized surface, a printing plate, a printing frame supporting said printing plate, and a light chamber having its upper end open and adapted to receive said printing frame and having some of its walls extending upwardly along side of some edges of the printing frame while one of its walls terminates below the printing frame and the upper of the other walls forming a passageway through which the printing frame and associated parts may be'moved horizontally into and out of said light chamber,

7. A photographic printing machine comprising means for supporting a sensitized member, a printing frame adapted to support a printing plate, a light chamber in which the printing frame is mounted, and means for rotatably supporting said light chamber in a plane parallel with said sensitized member and printing plate.

8. A photographic printing machine com prising means for supporting a sensitized member, a printing frame adapted to supin which the printing frame is mounted, and means for rotatably supporting said light chamber in a plane parallel with said sensitized member and printing plate, comprising a table upon which said chamber is mounted and which is provided with a pivot, abase provided with a bearing in which said pivot is journaled and means for holding said pivot and associated parts against turning.

5/. A photographic printing machine comprising means for supporting a sensitized member, a printing frame adapted to support a printing plate, a light chamber in which the printing frame is mounted, and means for rota-tably supporting said light chamber in a plane parallel with said sensitized memher, and printing plate, comprising a table upon which said chamber is mounted and which is provided with a pivot, a base pro-\ vided with a-bearing in which said pivot is j ournaled and provided with a split lengthwise of said pivot, screw nuts mounted on said base on opposite sides of its split and a clamping screw engaging both of said screw nuts.

10. A photographic printing machine comprising means for supporting a member having a sensitized surface, a printing plate adapted to engage the sensitized surface of said member, a supporting block adapted to engage the opposite side of said member, and means for moving said block toward and from said sensitized member comprising a shank on which said block is mounted, a guideway in which said shank slides, a gear rack arranged on said shank, and a pinion mounted on said guideway and meshing with said gear rack.

11. A photographic printing machine comprising means for supporting a member ha"- ing a sensitized surface, a printing plate adapted to engage the sensitized surface of said member, a supporting block adapted to engage the opposite side of said member, and means for moving said block toward and from said sensitized member comprising a shank on which said block is mounted, a guideway in which said shank slides, a gear rack arranged on said shank, a pinion mounted on said guidcway and meshing with said gear rack, a worm wheel connected with said. gear wheel, and a shaft provided with a worm meshing with said worm wheel.

12. A photographic printing machine comprising means for supporting a member having a sensitized surface, a printing plate adapted to engage the sensitized surface of said member, a supporting block adapted to engage the opposite side of said member, and a supporting head provided with a guideway parallel with the plane of said sensitized member in which said supporting block slides for connecting and disconnecting said supporting block and head.

13. A photographic printing machine comprising means for supporting a member having a sensitized surface, a printing plate adapted to engage the sensitized surface of said member, a supporting block adapted to engage the opposite side of said member, a supporting head on which said supporting block is mounted and which is provided with a pivot having its axis arranged at right angles to the plane of said sensitized surface, and a bearing in which said pivot is journaled.

14. A photographic printing machine comprising means forsupporting a member having a sensitized surface, a printing plate adapted to engage the sensitized surface of said member, a supporting block adapted to engage the opposite side of said member, a supporting head on which said supporting block is mounted, a pivot connected at one end with said head, a bearing in which said pivot is journaled and which is engaged at one end by said head, and a clamping screw nut arranged at the opposite end of said pivot and engaging with the other end of said bearing. r-

15. A photographic printing machine comprising means for supporting a member having a sensitized surface, a printing plate adapted to engage the sensitized surface of said member, a supporting block adapted to engage the opposite side of said member, a supporting head on which said supporting block is mounted and which is provided with a pivot having its aXis arranged at right angles to the plane of said sensitized surface, a shank having a bearing in which said pivot turns, and a guideway in which said shank is slidable lengthwise.

16. A photographic printing machine comprising means for supporting a member 35 having a sensitized surface on one of its sides, a transparent printing plate adapted to engage said sensitized surface, a transparent supporting plate on which said printing plate is mounted, a printing frame on which the supporting plate is mounted, retaining blocks arranged on the printing frame and engaging with the edges of the supporting plate, jaws guided on said blocks and engaging the edges of said printing 5 plate, and clamping screws connecting said blocks and said jaws.

17. A photographic printing machine comprising a carriage, a stop on said carriage, a relatively stationary bracket, and a micrometer screw mounted on said bracket and adapted to be engaged by said step.

18. A photographic printing machine comprising a carriage, a stop on said carriage, a relatively stationary bracket, a micrometer screw mounted on said bracket and adapted to be engaged by said stop, a relatively stationary bar provided with a row of openings, and a pin passing through said bracket, and One or another of the openings in said bar.

19. A photographic printing machine comprising means for supporting a sensitized member in a horizontal position with its sensitized surface facing downwardly, a printing plate adapted to engage the underside of said member, a supporting block adapted to engage the upper side of said member, a light chamber on which said printing plate is mounted, a baseon which the light chamber is mounted, an arm which projects upwardly from said base and overhangs said sensitized member and on which said supporting block is mounted, a primary carriage movable horizontally in one direction, guides on which said primary carriage is mounted, and a secondary carriage on which said sensitized member is mounted and which is movable horizontally on said primary carriage at right angles thereto.

20. A photographic printing machine comprising a light chamber, means for supporting a printing plate in said chamber, illuminating means arranged Within said chamber, and means for forcibly Withdrawing the air from said chamber.

21. A photographic printing machine comprising a light chamber, means for sup porting a printing plate in said chamber, illuminating means arranged Within said chamber, and means for forcibly withdrawing the air from said chamber comprising a blower having its inlet communicating With the interior of said chamber.

22. A photographic printing machine comprising means for supporting a sensitized member, a printing plate adapted to engage the sensitized surface of sald member, a llght chamber on which said prlntmg plate is mounted and Which is rotatable H about an axis at right angles to the plane of said sensitized surface, a supporting block adapted to engage the opposite side of said member, means on Which said block is mounted and which are rotatable about an axis at right angles to the plane of said sensitized member, and means for indicating the relative position of said printing plate, supporting block and sensitized member about said axes.

lVitness our hands this 12th day of June, 0

JOHN H. FULLMER. ROBERT W. RUNSER.

Witnesses:

THEO. L. Porr, E. GRAHAM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, walhington, D. 0.