US1832026A

US1832026A - Photographic printing apparatus

Info

Publication number: US1832026A
Application number: US266432A
Authority: US
Inventors: William C Huebner
Original assignee: HUEBNER BLEISTEIN PATENTS COMP
Current assignee: HUEBNER BLEISTEIN PATENTS COMP; HUEBNER-BLEISTEIN PATENTS Co
Priority date: 1928-03-31
Filing date: 1928-03-31
Publication date: 1931-11-17
Anticipated expiration: 1948-11-17

Description

Nm: l?, 1931. w. c. HUEBNER PHOTOGRAPHIC PRINTING APPARATUS Filed March 31. 1928 7 Sheets-Sheet l Nov. 17, 1931.

W. C. HUEBNER PHOTOGRAPHIC PRINTING APPARATUS Filed March 3l, 1928 '7 Sheets-Sheet 2 N111?, 1931. WQHUEBNER' www@ PHOTOGRAPHIC PRINTNG APPARATUS Filed March 31, 192s '7 sheets-sheet 5 Nov. 17; 1931. w. c. HUEBNER PHOTOGRAPHIC PRINTING APPARATUS Filed March 5l, 1928 '7 Sheets-Sheet 4 frag/M445.

Nov. 17, 1931. w. c. HUEBNER PHOTOGRAPHIC PRINTING APPARATUS Filed March 3l. 1928 7 Sheets-Sheet 5 w. C.HUEBNER 1,832,026

PHOTOGRAPHIC PRINTING APPARATUS Filed MaIGh 3l, 1928 7 Sheets-Sheet 6 Nov. 17, 1931.

\ v L x; d Newmi Kw1 Qxamwvmw x H 1W W l l my 1| mmJ huw/mmf @wiwi N M V//, Q fm@ H @Kw @u ww ha w //fww uw www. W m /MN m w W h m m W h mw w w j L M M M M p w 1% M w Q M @u QMU W www m QN u .H n mi. l M QW f m w d mkuw www //T m m um o 111mm. Hummm WWIHHHMV .i lm m L ML M1 ML P e@ Om, MWF: 4 @1 MN fr @W @1 \Mu\\.\ \\m m WNW n \1\%\\ Nw. i?, WSL w. s. HUH-NER FHOTOGRAPHIC PRIN TING APPARATUS Filed March El. 1923 Patented Nov. 17, 1931 PATEN WILLIAM C. HUEBNER, OF CHICAGO, ILLINOIS, ASSIGNOR T HUEBtER-lllltl'lil i PATENTS COMZPANY, 0F BUFFALO, NEW YORK PHOTOGRAPHIC PRINTING APPARATUS Application led March 31, 192B. Serial No. 266,432.

This invention relates to improvements in photographic printing or composing apparatus for producing contact photographic prints in any required predetermined positions upon print-receiving surfaces or elements, such as the sensitized surfaces of sheet metal press plates which are used in mechanical printing presses for printing in one or several colors.

Such apparatus usually comprises a support or holder for the sensitized press plate, a support or holder for holding aI negative or positive printing plate, sheet or other element (hereinafter called the printing element) in 1.3 tace to tace relation with the sensitized surface of the press plate (hereinafter called the print receiving element) means for causing mate uniform Contact between the faces a f said elements, adjusting means for causing la relative movementbet-Ween said elements parallel with the faces thereof to enable prints to be made in desired predetermined relations or locations on the print receiving element, and means for causing a relative i.; movement of said elements toward and from each other for placing them in Contact and separating them to permit clearance during said relative parallel movements therebetween. The printing is effected by exposure 3U of the sensitized surface to a suitable source ot light through the image or printing element.

ln the particular type of apparatus under consideration, the relative parallel movements between the print receiving and printing surfaces are effected by vertical and horizontal adjustments of the latter in a plane aarallel to the surface of the former so that an image on the printing plate or element can f) be located opposite different portions of the print receiving element, While the latter remains in its initial location on its holder or support.

One object of the invention is to provide an improved novel photographic printing or composing apparatus of relatively simple, compact and inexpensive construction.

Other objects of the invention are to provide such apparatus with a novel, adjustable carriage for the printing plate or element,

and also to provide a carriage or this sarwhich is adapted to support a relatively large printing element either in the forni ot a rigid plate or flexible sheet, whereby large subjects can be printed on the print receiving element for use in poster Work and the like; alsa te provide, in connection with a snp- -port for the'print receiving element, novel stop and locking means for arresting said support when moved to printing position and locking it in such position during the printing operation; also to provide a relatively simple clearance mechanism for eiecting separation between the printing and print receiving surfaces while the swinging support is loclred to permit adjustments of the printing element to new locations relatively to the print receiving element; and also to improve Y graphic printing apparatus oit the el described in the other respects hereinafte set forth and claimed.

In the accompanying drawings Fig. l isa front elevation et ai l printing apparatus embodyingi u I' the swing frame or support :tor sensitised print receiving plate or element being omitted.

Fig. 2 is a fragmentary trent eleve-.tion thereoi` with the sensitized plate support in printing position, portions of said support being omitted for the sakeiof ctearness. n

Fig. 3 is a transverse section est a detail of the stop means and locking mecli nism `for the sensitized plate support, take von line 3-3, Fig. 12.

Fig. 4 is a front elevation on an enlarged scale, of a portion of the main cframe with the carriage for the printing plate or element mounted thereon. i i

Fig. 5 is a fragmentary, horizontal section of the apparatus on an enlarged scale., partly on the line 5-5, Fig. l and with a portion of the sensitized print receiving element and its holder in operative or printing relation to the printing element.

Figs. 6 and 7 are respectively a transverse vertical section and a horizontal section et the locking mechanism for holding the vertically movable printing element carriage in any position to which it is adjusted.

tia'

Fig. 8 is a fragmentary, vertical section of said lock mechanism on line 8 8, Fig. 7, in

plane at right angles to Fig. 6.

Fig. 9 is a fragmentary, transverse, vertical section, on an enlarged scale, on vline 9-9, Fig. 1, of the printing element carriage and the adjusting mechanism.

i@ is a similar view thereof, on a still larger scale on line 10-10, Fig. 1.

Fig. 11 is a fragmentary face view of the apparatus with a relatively large printing element and its holder mounted thereon.

Fig. 12 is a fragmentary, rear view, on an' enlarged scale, of a portion of the support Itier 'the print receiving element, showing the nechanisrn for e'ectin clearance between said element and the printing element.

Fig. 13 is a fragmentary, transverse section thereof, on line 13-13, Fig. `12.

Fig. 14 is a vertical section of the holder of said support showing suitable means for mounting and stretching a flexible sensitized plate or element thereon.

The invention is illustrated in connection with a photo composing or printing apparatus of the vertical type in which the printing and print receiving surfaces or elements are disposed in parallel vertical planes.

The apparatus shown in the drawings comprises generally an upright stationary main frame or support A on which is mounted for vertical movement a carriage B on which the transparent printing plate or element X is supported. rThe printing element X is in 'turn adjustable horizontally on the carriage B.

A print receiving surface or element Y such as a sensitized, exible, sheet metal plate, is mounted and stretched taut on a holder C, attached to or forming part of a swing frame or support D hinged or pivoted at one side oi the main frame A so as to be swung either into an operative position in front of said frame A with the element Y in a parallel relation to the printing plate X or into an inoperative position extending in angular relation to said frame A to permit access to said elements X and Y. The swing frame is provided with mechanism which, when said frame is in operative position, is used to place the rint receivin element Y into contact with t e element X or printing, and out of contact therewith for effecting -a clearance between said elements, to permit z5 the element X to be adjusted to different predetermined locations with reference to Said element X.

A suitable source of light, not shown, may be confined within a hood a: arranged at the back ofthe printing plate X for effecting the exposure of an image thereon through the same upon the sensitized plate Y.

The main frame A is preferably formed of a pair of parallel, spaced uprights or hollow posts 10 connected at the upper ends by a cross member 11 and adjacent their lower ends bfy a cross member 12. These lower ends o said uprights are preferably to brackets or

castings

13 and 14. forming part of a stationary base or platform 15. Each of the uprights 10 is formed with a vertical channel or recess 16 extendirag substantially throughout its length. A slide gages or fits in this recess and is confined 1for vertical sliding movements therein b' overhanging retaining strips 18, fined to t e forwardly projecting side edges of the uprights. On a forwardly projecting,rednced rib or portion 19 of the slide bar, there is secured a scale 20 divided into any desired 'te measure, such as inches, by graduations 21.

The carriage B is slidably connected to the slide bars 17 to move up and down rela tively thereto, to edect a primary coarse vertical adjustment of the printing element X, these movements being indicated by the scales 20. The carriage can also be locked to said bars 17 and the bars and carriage adjusted vertically relatively to the iframe A, these movements being indicated in small fractions of said units of measure, as will be explained, to effect a final line adjustment of the said element X.

The carriage B includes a pair of parallel,

spaced, horizontal cross bars or members 5 and 26 which extend across the main frame in front of the uprights 10 with their ends preferably extending laterally beyond, said uprights, see Fig. 1. The lower bar .26, see Fig. 1, is provided opposite the slide bars 17 with a pair of rearwardly extending slides or blocks 27 of channel cross section. Each slide 27 is disposed with its legs 23 straddling the projecting rib 19 and scalef20 oi the respective bars 17 and slidably in parallel lengthwise grooves 28o: in said bar, being' confined therein by ovcrlianging strips Each block is mounted on a pivot stud on the rear of the bar and is arranged to turn thereon to a limited extent to prevent binding in the grooves 28, being confined by epposed parallel retaining strips 31 on said bar 25 and which engage corresponding flanges 32 on said slide blocks 27. The upper bar 25 is provided with a pair of similar slides or blocks 33, also mounted and operatively engaging the slide bars 71 in substantially the manner just described. One of the carriage bars, for example, the lower bar 26, is provided With a slide bar 35 similar to the slide bars 17, and which slidingly its in a length` Wise channel or recess 36 therein, being held in position by strips 37. A forwardly proj ccting lengthwise rib 38011 said slide bar carries a scale 39 divided into units of measure by graduations 40.

lThe printing plate or element X is disposed so as to extend vertically between the carriage ybars 25 and 26, being mounted for .this purpose on a rigid holder or frame removably secured at top and bottom to attaching slides or

members

44 and 45 mounted and arranged for longitudinal movements on the

respective bars

25 and 26.

When a glass platc X or other substantially rigid element is to be used, a holder 46, as shown in Figs. 1, and 10 can be employed, while when a flexible printing element, such as a paper negative or positive, or a iilm is to be utilized, a holder 46a, Fig. 11 is preferably utilized. The latter is especially desirable for large poster work and reduces the expense and difficulties incident to the use ot" large glass plates.

'lhe holders 46 and ,46a comprise suitable side and top and bottom members surrounding a printing opening 47 over which the printing plate is detachably secured by suitable blocks 47a and into which the hood m of the light projects.

To enable suction to be used for withdrawing air from between the. contacting surfaces ot the elements X and Y, cach holder is provided with a connection 48 for a hose or passage 49, which communicates with a suction chamber or space 5() formed by a ledge 51 extending around the plate X in spaced relation thereto. The ledge 51 is provided with a sealing gasket 52 which engages the face of the print-receiving element Y.

rlhe holder 46a is substantially like the holder 46 except that it is provided with adjustable clips 53 for gripping the edges ot the flexible printing element X and stretching said element taut and smooth.

The smaller holders 46 are detachably connected in predetermined relation to the attaching

slides

44 and 45 by centering studs or dowels 54 on the latter which fit in holes in said holders, while the larger holders 46a are centered on similar studs 540:..

The studs 54, 54a and the holes in the respective holders are placed in definite predetermined locations so that all holders tor each set of studs are located in exactly the same position on the attaching

slides

44 and 45. When the desired holder has been attached to said

slides

44 and 45, it is locked in position by swinging fingers or catches which engage over the edges of the holder, see Figs. 1, and l1. The holders for the printing elements can. however, be of any other suitable construction.

Means are provided tor varying the distance between the bars and 26 of the carriage B in order to accommodate printing plates and holders of diiierent vertical dimensions. The means shown, see Figs. 1, 4 and 9, includes a horizontal operating shaft 56 journalled at each end in hollow bearing brackets 57 fixed to and projecting upwardly from the ends of the bar 25. Within each bracket 57 the shaft 56 is provided with a spiral gear 58 meshing with another spiral gear 59 also bearing in said bracket. These gears 59 are splined on and arranged 'for end- Wise movement relatively to a pair et vortic .l shafts 60, one ot which is arranged at each side of the apparatus. Each shaft 60 is provided with upper and lower, oppositely screw-threaded

portions

61 and 62 which re spectively operatively engage in thi sleeves or

nuts

63 and 64. rllhe sleeves rigidly secured in liXed brackets 65 projecting rearwardly from the upper carriage bar 25, while the sleeves 64 are similarly disposed in corresponding brackets 66 on the lower carriage bar 26, see Figs. 4 and 9.

It will be seen that upon rotating the s 56, as by a crank 68 on one end there-o ishafts 60 will be caused to rotate in unison, and through their engagement in the

sleeves

63 and 64, will effect relative adjustments et or vary the distance between the bars and 26.

Preferably, when the carriage bars to be adjusted for mounting, a holder tl'iereon, the lower bar 26 is temporarily locked to the vertical scale bars by means to be described, thus causing all of the motion from the screw shafts to be applied to the upper scale bar 25. It desired, however, the bars can both be simultaneously actuated by the screw shafts 60 by leaving the bar 26 unlocked.

In order to indicate or observe the amount of the adjustment of the bar 25 relatively to the bar 26, the shafts 60 are each provided with a part movable past a vertical scale har 69 fixed to the adjacent upright 10 the main frame A. Each indicating part consists of an arm 7 O swivelled on and prevented from endwise movement relative to its shaft 60 and having its free end 71 biturcated to slidiugly embrace an edge or guide portion 7 2 ot' 'the adjacent scale bar 69. In this manner, 'the indicating arm can travel alongl scale bar without binding thereon. A suitable line. or pointer 73 on each arm cooperates with the graduations 74 on the scalo to clearly indicate the adjustments ot the carriage bars. ldhen i using the described indicating means, the movement of the arms 70 is observed and Athe adjustment of the bar 25 is stopped when the pointer has travelled halt" the required distance, as owing to the fact that the lower bar is held stationary, the action of the

opposite screw thread

61 and 62 causes said bar 25 to travel twice the indicated distance.

The vertical scales 2O and the horizontal scale 40 are constructed substantially as in ing one-half inch in width, thus providing precise scale to which the part of the apparatus moving relatively to said scale can he coupled in exact predetermined position, for eli'ecting a primary coarse adjustment of said part.

rl`he upper attaching slide 44 is provided on its rear face with opposed guide members 79 slidably engaging the opposite edge por tions of a forwardly projecting T-sha )ed track portion 80 on the upper carriage ar E25. The lower attaching slide` however, is

provided with a pair of spaced slide blocks 81, similar to the slide blocks 27 and 33 before mentioned, and the legs S2 of which straddle the scale har 39 and projecting portion 38 of the slide har 35 and slidably enin longitudinal grooves 83 in said bar. The slide blocks are held in posit-ion by retaining strips 84.

it will be seen from the foregoing that the carriage B is a rigid or 'unitary structure composed of bars and Q6 adjustably tied together by the screw shafts G0, and i en in use, also b v a holder 4G or 46a. This structure as a whole is movable vertically upon the main frame` while the holder for the printing element X connected to the attaching slides ai and is movable horij aiong the carriage by the sliding connections between said slides and the carriage hars. Thus. the printing element can he moved in a plane parallel with its face he appropriate horizontal and vertical adi 'iment to any desired location within the of the apparatus, or in other words, ithin the length of the said carriage bars and said screws G0 respectively. and any size holder within these limits can be mounted on said carriage.

,i ny suitable means may he provided for i. eciing the primary horizontal adjustments of the printing element holder relatively to the carriage lli and also for effecting the primary coarse vertical adjustment of the, carriage as a whole. For the former. in the construction shown. the attaching slide is provided with a dependingr lug or part 85, see Figs. 1 and 10. in which is journalled a yshort. horizontal. transverse shaft 8G formed at its front endl for the reception of a suitable operating crank 87. Fixed on the rear end of said .shaft is a pinion 8S which meshes with a horizontal rack 89 on the lower edge of the carriage har QG. B v rotating the shaft 86 in one direction or the other, the attaching

slides

44 and 45 with the printing element holder secured thereon can be adjusted lengthwise of the carriage B for the desired distance in inches or half inches, the adjustment being shown, for example, by a pointer 90 arranged in an opening in bar 45 and cooperating with the graduations on the scale 39.

After this adjustment has been-effected,

the parts are loc (ed to the slide bar 35, af which, if required, a further ment, in small fractions of an inch, is et The locking means shown for the d purpose comprises a locking member 95, F ig. 10, arranged in a cavity in the lug 85 and provided with a pair of upstanding fingers 96. The member is formed with :raciti teeth 97 with which meshes ai pinion 98 formed on a shaft 99 journalled in si :ci lug and provided with a handle for turn ng it. Upon rotating said shaft 99 and pinion 98 in one direction, the member 95 is raised to the position shown in said Fig. 10, with the fingers 96 extending through a hole in the slide block 81 into interlocking rela tion With the adjacent blocks 76 of the scaie 39. The fingers are formed to exactly fit between said scale. so that the pars are thus rigidly locked together.

The fine or fractional horizontai adjustment of the printing element X is new obtained by the following means, see Figs. 1, 4; and 5. Fixed to one end of the lower earu riage bar 26 is a. bracket 100 having split clamp formed with a threaded hole 101' in with a fixed scale drinn 105 divided on its i periphery by graduations i0@ inte one hun dred equal divisions. These graduations reg-- ister with a fixed pointer 107 on the bracket 100. The threaded portion of the shaft 101 is provided with a predetermined number of threads per inch or unit of measure, for est ample, ten. Then the shaft 102 is rotated it moves endwise in the bracket and causes a eorresj'ionding movement of the slide bar relatively to the bar 2G. Therefore, each revolution of the shaft adjusts the bar 35 one-tenth of an inch, this travel being indicated by the drinn` 105, while fractions of each revolution are indicated by said drum in thousandths of an inch.

Before operating the rack and pinion coarse adjustment of the. attaching slide, the screw shaft 102 is turned to placel the drum at zero so that the full unit adjustments are correctly performed, after Which the desired fractional adjustments are iliade.

The coarse adjusting means for the carriage B includes a horizontal operating shaft 110 journalled in depending portions 111 of the carriage slide blocks 27, and also a assaoae similar part of the bracket 100. Alongside each part 111 the shaft is provided with a fixed pinion 112 which meshes with a vertical rack bar 113 on the adjacent main car- 1 riage upright 10.

By appropriate manipulation of the shaft 110, the carriage B can be raised or lowered, the adjustments thereof being indicated either by the scales 69 and pointers 71, or by the scales and cooperating pointers 114 on the carriage.

The carriage is preferably connected by chains 115 passing over sprockets 116 to counterweights concealed Within the uprights 10. When the vertical coarse adjustnient has been made, the carriage B is locked to the vertical slide bars 17 on the main traine by suitable means. rllhe means shown for this purpose, see Figs. 11, 6, 7 and 8, comprises a horizontal rock shaft 12() journalled and held from endwise movement in the slide parts 111 and in the bracket 100. Adjacent each of the parts 111, the shaft lis provided with a fixed sleeve 121 havingi thereon a. rearwardly extending oblique cam or part 122 operatively engaging in a complementary groove 123 in a bolt 124. This bolt is arranged in a casing 125 fixed to the side face of the depending slide part 111. lfplach holt, see Fig. 8, is provided with spaced *lingers 126, the bolts being simultaneously projected laterally through holes in said parts 111 for placing said fingers into or out inciting engagement with the blocks 7 6 of adjacent vertical scales 26 upon appropriate manipulation of said rock shaft 120, as by the handle 127.

rllfhe fine vertical adjusting mechanism for the carriage B is substantially like the hori sontal fine adjusting means described and comprises a horizontal adjusting shaft ei-:tending parallel to and in rear of the main frame and journalled at each end in a lixed bearing bracket 131 on the adjacent upright 10. llilithin each bearing 131 said shaft 130 is provided with a spiral gear 132 which meshes with a similar gear 133 fixed to the lower end of a vertical shaft 134 also journalled in said bearing jacket. A part of each shaft 131 is provided with a screw portion of ten threads per inch, this portion being received in a threaded split aperture in a bracket 135, which has a lateral part 136 by which it is fixed to an edge of the adjacent slide bar 17.

A. drum 137 fixed to the upper end shaft 131- is provided with one hundred equal graduations 138 movable past a fixed pointer 189 on said bracket 185. Thus by turning the shaft 130, as by crank 140, the shafts 134 are simultaneously rotated and the two slide bars 17 are moved endwisc in unison carrying with them the carriage B through the medium of the locked slides 27. llf desired, an expansion spring or the like 141 can be disposed when making adjustments. The swing frame or support D for tire sensitized sheet metal plate or print- .ceivu ing surface, see Figs. 2, 12 and 18,

of a pair of spaced uprights 1418 and j substantially channel cross section iiy idly i, connected at their upper and lower ends cross bars 14:2 and bounding an opening over which the element Y and its holder are arranged.

A vertical post or member il its lower end in a forwardly ext i i of the main frame bracket 111 and at end in a bracket 145 extending from s id frame A serves as a pivot for the reception` of spaced upper and lower hinge members 146 fixed to the upright 1111 of the swing frame. rlhe swing frame ll can be turned about the axis of the pivot W14- frcfi f tion extending at an angle to the inl to an operative position in front of parallel therewith for placing the receiving elemet Y opposite the printing element X.

As the swing frame D moves into said pw erative position it engages suitable stop and if centering or ositioning devices on the main frame A for ringing the swing frame to in exact predetermined relation to s f1, suitable locking means bein 's rigidly holding 'the swing f relation.

The stop and centering means used comn prises two horizontal I'ixed studs 118 pro jecting forwardly respectively from. the low er main frame bracket 13 and from bracket 149 on said frame. These are received in closely ntting huslv on the swing frame, these bushings heist.,i preferably adjustably mounted in

eccentric sleeves

151 and 152, whereby they can he accurately alined with the. studs 148, prcjecting stop sleeve 153 suurroundi'` each bushing is adapted to abut an enlargement or stop face 154 on the corra sponding stud to arrest and correctly posi tion the swing frame.

The locking means for the swing frame consists of a pair of latches 156 each of which is pivoted at one end of its ends on the swing frame adjacent and at one side of one of said studs.' The latch extends across the upper side of said stud, being movably arranged in the path thereof so as to be engaged and lifted by a cam end or part 15?l on 'the stud as the latter passes through its corresponding bushing 150. As the swing frame comes to rest against the stops 154, each latch t' and fits snugly into a notch 158 in 'the sti. thus locking the swing frame in operative position. Preferably the latches 156 pivotally connected to an upright link 159 provided with an operating handle which rrojects laterally through a slot 161 in the ing' trame. The handle normally rests by nity on the lower edge of the slot 161 for ding the latches in position to be engaged y the studs 148. The handle 160 and link 'il appropriate means for simultaneng' disengaging from the studs it3 both latches when the swing frame is to he released.

'llhe plate holder C can be of any suitable construction, being formed, in the construction shown, of opposite spaced uprights 165 1idly connected by top and bottom cross mel bars 166 and 167. he upper and lower edge portions of the t metal or other flexible element Y are .red between pairs of reinforcing and ipping bars 168. The upper bars are reieasably held in the usual inclined jaws or blocks 169 arranged in the channel 166, while lower bars are held in a similar manner in vertically adjustable blocks 170 slidably red in guides in the lower channel bar 167. These blocks are adjusted by screws 171 having threaded engagement in a fixed web on said channel bar so as to draw the llenible plate taut over the inner edges of the incl bars. The flexible element Y is prefthongh not necessarily reinforced by sectional backing plate 172, the face l i hielt is rigidly held in the plane of the f ol" said element by a cross bar 173 fixed le members oi the holder, and which -s spaced vertical strips 174 on d l aclring plate. This reinforcement is itted trom Fig. 2 for the sake of clearlate holder C is suitable secured on a a. Ahe or Carrier 175 consisting of par- ;op and bottom strips 176, and similar opposite side strips 177. This carrier is n moya-bly mounted on the swing frame to away from and towards the same a prerrnined or fixed distance in a direction endicular to the face of the print receivement Y for placing said face into and l, t contact with the printing element X fr r printing, and tor aifording clearance between their faces when adjusting'tlie printing element on its carriage B. For this purpose the carrier 175 is provided at each corn with a rearwardly extending, xed stud which is received ina sleeve portion 179 i a bearing bracket 180 fixed on the rear race ot' the adjacent corner of the swing me. lilotatably journalled and prevented om endwise movement in said bracket is a sleeve 161 which is interiorly threaded for engagement with the inner threaded end of the stud 78. Fixed on the sleeve 81 is a sprocket wheel 182. One of the sleeves 181 is provided with a crank 183 for rotating it, and all ot the sprockets, as Well as a tightalle nssaoae tated and screw studs 178 projected or rein tracted in unison by means of' the sleeves 181.. In the position of the parts shown n' 18, the print receiving elem printing plane, po mined by any suitable adju j dicated at 186, while the clearance position is obtained by the engagement ot the rear of the carrier 175 with the front tace el the swing frame.

The photographic printing herein describe-d is of relatively si L compact construction and 's adapted tor the etlicient production of relative y' large worl, owing to the fact that the carriage permits the use of large size printing plates or cleu ments. The adjustments tor mounti rg and positioning these elements can be easily a d rapidly made. The locking means and clearance means for the print receiving element support are relatively simple and can be readily manipulated, while the swing traine` pivotally arranged as disclosed, permits" ready access to the printing and print receiving elements for adjusting or changing one size for another. ll/loreover, the ne relatively large printing elements is a :o made possible by the disposition ol in printing element holder at one side ot f' wardly beyond the carri l is forwardly or in 'front ci f Y yond the uprights ot the ma' i t this way there is no obstruction to the use and adjustment of large printing elements.

I claim as my invention 1. In a photographic printirwfthe combination oit a support iler print-receiving element, a holder on a printing element is adapted to be for supporting said printing element m p determined relation to and in face 4face printing contact with said print-receff element, a carriage on which saidliolder Y mounted and which includes spaced g 'i members, a slide bar mounted on' and adapted for lengthwise movements relatively to one of said guide members, attaching means for connecting said printing element holder to said slide bar so as to move relatively thereto to effect a primary coarse adjustment of said holder along said guide member, means for locking said attaching means to said slide bar, means for moving said slide bar and said holder relatively to said guide member for effecting a final. fine adjustment of said holder, and means formovably connecting said holder to said other guide n1ember for movement relatively thereto during said coarse and fine adjustments.

2. In a photographic printing appa etna, the combination of a support for a sensitized lid las

-for connecting said holder to said slide bar so as to move relatively thereto to effect a primary coarse adjustment of said holder along said guide member, a stationary scale on said carriage for indicating such adjustments, means for locking said attaching means to said slide bar, a fine adjusting mechanism for moving said slide bar and said holder relatively to said guide member for v eliectinaV and indicating a final fine adjustment ot' said holder. and means for movably connecting1 said holder to said other guide member for movement relatively thereto during said coarse and fine adjustments.

3. lin a photographic printing apparatus, a holder on which a printing element is adapted to be mounted, a support on which said holder is secured` a support for a printreceiving element pivotally mounted on said other support so as to swing to and from an operative position parallel thereto to position said print receiving element face to face with said printing element, a positioning stud on one of said supports, a bushing on said other ,iport into which said stud lits when said swinging support is moved to operative position. a gravity latch disposed in the path ot said stud, a part on said stud for lifting said latch when said stud enters said bushing. and said stud having a notch into which said latch drops to rigidly lock said swinging,r support in operative relation to said other support.

l. lin an apparatus ot the character dcscribed, the combination with a holder adapted .to retain a printing,y element; of a carriage on which said holder is mounted, said carriage including spaced guide members: an attaching member lengthwise adlustal'ily supported on each guide member, said attaching members being independent of each other; means for attaching the holder rigidly to one of said attaching members so as to move therewith as a unit; a main trame on which the carriage is supported: means for temporarily lockingn one only of said guide members to said frame in adjusted position: and means operatively connected to said guide members tor adjusting the same relatively toward and from each other while the one of them is locked to said frame.

5. ln an apparatus of the character dcscribed, the combination with a main frime having a stationary guide member; of a slide bar adjustably mounted on said `guide member; a carriage; means for adjusting said -arriage lengthwise of said guide member inodepen dently of said slide bar; means Mtor looking; said carriage to the slide bar in adjusted n i tion; and additional means 'for adj ns'in i slide bar and the carriage while locked thereto, relatively to said guide member.

6. In an apparatus of the character described, the combination with a main of a carriage adjustably moon eo. se o main frame to move in one direction; slide bar adjustably mounted on said carriage to move in a direction transverse to the iirst named movement; a slide adj usta-bly mounted on said carriage in a direction transverse to the irst named direction, said slide being adapted to have a. holder mounted thereon; means for adjusting said slide relative to the carriage and independently oit said slide bar; means for locking said slide in adjusted position to said slide bar; and means 'ii adjusting the slide bar relative to the carriage While the slide is locked to the slide 'l'. In an apparatus of the character scribed, the combination with a mein trame having a stationary guide member; oa siide bar mounted to move lengthwise of said guide member; a carriage slidably mounted on said guide member; a slide bar adjustably mounted on said carriage to move in a direction transverse to the line of movement on. said ,guide member; a slide also adjustably mounted on said carriage to move in the same direction as the slide bar thereon; seperate for adjusting the carriage lengthwise "i said guide member and the slide lengthy e the carriage, respectively; means :tor locking the carriage to the first named slide bar and said slide to the second named slide bar, in adjusted positions, respectively; and additional means for adjusting each of the slide bars with the carriage and slide locked respectively thereto.

8. ln an apparatus of the character described, the combination with a main frame; of a carriage slidably adjustable on said main trame in one direction, said carriage including parallel spaced guide members; a slide on each of said guide members and movable lengtliwise thereof, said slides being1 adapted to retain a holder thereon; a slide bar lengthwise adjustable on one oit1 said guide members; means for adjusting one of said slides relative to its guide member; means for looking said slide to the adjacent slide bar; and means for adjusting said slide har relative to its respective guide member while the slide is locked thereto.

9. ln an apparatus of the character described, the combination with a stationary trame; of a carriageadj ustably mounted thereon to move in one direction; a printing; element holder mounted on said carriage and positioned in a plane outwardly oft said main frame and the carriage; a support for a printrecciving holder, said support being pivotally ist m,

attached to the frame; a print-receiving holder mounted on said support, the latter and the print-receiving holder bein adapted to be brought into parallel relatlon wlth the printing clement holder; means for adjusting said print-receiving holder toward and from the printing element holder to effect clearance therebetween; and means for ef- Vl'ectug a relative shift between the printing element holder and the print-receiving holder in a direction at right angles to said line of movement of the carriage on the stationary iframe.

l0. In an apparatus of the character described, the combination with a guide member; ot a slide bar mounted thereon; a slide adapted to support a holder, said slide being movable lengthwise of said guide member independently of the guide bar; means for locking said slide to the guide bar in various adjusted positions; and means for effecting movement of the slide bar lengthwise of the guide member while said slide is locked to the slide bar.

l1. In an apparatus of the character described, the combination with a main frame; ot' a carriage adjustably mounted on said main frame to move in one direction, said carriage including parallel guide members adjustable toward and from each other for holders ot difi'erent sizes; of a slide lengthwise adjustable on one of said guide members ina direction at right angles to said line of adjustment of the carriage, said slide being adapted to have a printing element holder secured thereto; a second slide mounted on the other guide member and to which the opposite end of said holder is adapted to be attached whereby both slides are movable in unison when a holder'is in place; means tor mechanically effecting adjustment ot one ot said slides relative to its guide member: and additional means for effecting a final lengthwise adjustment of said last named slide relative to its guide member.

l2. In an apparatus of the character described., the combination with a main frame; of a carriage adjustable on said main frame in one direction, said carriage including a guide member extending at right angles to said line of adjustment; a. slide slidably mounted on said guide member in a direction at right angles to said first named line ot adjustment; means for effecting a relatively coarse adjustment of said slide relative to its guide member; and additional means for edecting a relatively fine adjustment of said slide relative to its guide member.

i3. In an apparatus of the character described, the combination with a main frame; of a carriage slidably mounted on said main frame; two independent sets of means for separately effecting relatively coarse and relatively fine adjustments of said carriage relative to said main frame; negative-holding means slidably mounted on said carriage in a direction at right angles to the line of move ment of the carriage on the frame; and two independent sets of means for separately mechanically effecting relatively coarse and fine adjustments of said holding means on said carriage.

14. In an apparatus of the character "en scribed, the combination with a main trama having stationary guiding means for a carriage; of a carriage movable lengthwise of said means; means for relatively coarsely adjusting said carriage lengthwise of said guiding means; a member lengthwise adjustable on said frame and parallel to the line of movement of said carriage relative to the frame; means for locking said carriage to said member when in relatively coarsely adjusted position; and additional means for effecting relatively finer adjustments of said member while the carriage is locked thereto, relative to the frame.

l5. In an apparatus of the character described, the combination with a. main frame; of a carriage adjustably mounted on said main frame to move in one direction; an attaching slide adjustably mounted on said carriage to move in a direction transverse te the first named direction and to which a holder is adapted to be dctachably secured; means for relatively coarsely adjusting said attaching slide relative to the carriage; means also adjustably mounted on said carriage to move in a'direction transverse to said first named direction of movement of the carriage; de vices for locking said attaching slide to said last named means in relatively coarsely adjusted position of said attaching member; and mechanism for relatively finely adjusting said means adjustably mounted on said carriage when the slide is locked thereton 16. In an apparatus of the character described, the. combination with a stationary mainframe; of a carriage adj ustably mounted on the main frame to move in one direction; a printing element holder mounted on said carriage and adapted to retain a printing element in one plane; a main support for va print-receiving holder also mounted on said main frame; a print-receiving holder adjustably mounted on said main support and adapted to hold a print-receiving element in a plane parallel to that of the printing element; means for adjusting said print-receiving holder toward and from the printing element holder to effect clearance therebetween, said means being mounted directly on said support and independent ot the main frame; and means for effecting a relative shift in parallel planes between the )rinting element holder and the print-recewing holder in a direction at right angles to Said line of movement ofthe carriage on the main frame.

WILLIAM C. HUEBNER.

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