US966498A - Automatically-operating variable-time-exposure photoprinting-cabinet. - Google Patents

Description

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J. F. WARE. AUTOMATICALLY OPEBATINQ VARIABLE TIME EXPOSURE PHOTOPBINTIHG CABINET. APPLICATION FILED 1A3. 29, 1909.

J m 8 a 9 G r 4 N W A J w W A J. P. WARE. AUTOMATICALLY OPERATING VARIABLE TIME EXPOSURE PEOTOPBIN TING CABINET.

A PPLIOLTIOI FILED IAB. 29, 1909. Patented Aug. 9,

3 SHEETS-SHEET 2.

av if .9:

J. P. WARE.

AUTOMATICALLY OPERATING VARIABLE TIME EXPOSURE PHOTOPBINTING CABINET.

. To all 'it may concerns provement' over a James F. Ware and the frame,

, \"UNITED' STATES PATENT OFFICE.

JAMES E. WARE, or DENVER, COLORADO, assrenon. or ONE-HALF '10 ARNOLD A.-

- A BOWI-IAY, or DENVER, concnano.

AUTOMATIGALLY-OPERATING VARIABLE-TIME-EXPOSURE PHOTOPRINTING-CABINET.

Be it known that I, JAMES F. WARE, a citizen of the United States of America, residing in the city and county of Denver and State of Colorado, have invented a new and useful Automatically-Operating Variable- Time Exposure Photoprinting Cabinet, of

which the following is a specification.

This invention relates to automatically operating, printing cabinets, and is designed as an imdevice. of this character Patent were granted to Thomas W. Bundle, No. 899,235, dated September 22, 1908.

Theobject of the present invention is to rovide a suitable cabinet, having a printing rame and a padded two-part print-holding shutter, which is hinged to one end of the frame and which, when pressed down upon is held by a latch, automatically operating mechanism being connected with the latch, whereby the same is tripped at a predetermined time to release the shutter, means being employed for varying the time during which. the latch is caused to engage and hold said shutter. Y

A further object of the invention is to provide in combination with a photo-print- 1ng cabinet, having a printing frame and for which Letters hinged padded print-holding shutter thereagainst the frame for a for, mechanism for holding said shutter predetermined time, said mechanism comprising a liquid-controlled,.gravity valve, and mechanism operated by said valve and connected with a latch for lockin the shutter, whereby when the shutter is c osed against the frame, the

said latch is operated to engage the shutter and hold the same until tripped by the mechanism, which is operated by the valve on its descent,- the valve being normally held in an elevated position A further object .of the invention is to rovide a cabinet of this character having a ight chamber at one end thereof, communicating with the cabinet, said chamber being normally closed by a door of suitably colored fabric, which is opened and closed automatically through connection with the valve controlled mechanism, so as to admit light to the cabinet when printing and shut it out when'the shutter is released.

, These objects-are accomplished by the Specification of Letters Patent. Application filed March 29,1909. Serial No.

- and latched.

vlongitudinal'sectional view of the cabinet,

variable time, exposure. photo cabinet and light chamber 0 n. Y of the and Fig. 9, is a the numeral 1,

by said mechanism.

mechanism illustrated drawings, in which:

Figure 1, is a plan view of the improved cabinet, showing the shutter pressed down F 2, is a central, vertical the print-holding Patented Aug. 9, 1910.

in the accompanying shntter being open, and

the operating mechamsm being in its normal or inoperative position. view of the cabinet, the front door of the same being open, showing the shutter down, the mechanism set, the valve stem in the act of descending, and the shutter between the Fig. 4, is a vertical sectional view operating valve. Fig. 5, is a horizontal sectional view thereof, on the line 55 of Fig. 4. Fig. 6,

F ig. 3,-is a front is a front view ofthe valve tube, showing 7 the triangular port therein. Fig. 7, is a ont view of the cut-off valve which fits in the tube. Fig. 8, is a fragmental, horizontal sectional view, on the line 88 of Fig. 3, showingithe operating mechanism in plan, plan view of a bracket which supports a portion of the operating mechan- 1SII1. I

Similar' characters of reference refer to similar parts throughout the several views.- Referring to the accompanying drawings,

indicates a rectangular casmgor cabinet, which is supported upon legs 2, and which is provided at its forward end 7 with a door 3, which gives access to the interior of the cabinet. Anopening 4, of suit abledimensions, is formed in the rear end of the cabinet, which communicates with a semi-circular casin 5, which is secured upon this end of the cabinet, and this end is preferably hinged to the cabinet, as shown bydotted lines, Fig. 1. The casing 5, is preferably a metallic casing, and its upper end has an opening 6, which permits a suitable illuminating withdrawn from, the casing, and which also permits theescape of heat generated by said illuminating means.

the cabinet, is a strip 7 of felt, and a door 8,

Around the opening 4, on the inside of means to be placed in, and' is adapted to normally close the opening.

This door or shutter comprises a frame, which is secured at its lower end upon a horizontal rod 9, pivoted at each end in bearin s 10, and which is referably covered by a s eet' of suitably col ored fabric. One I which .is attached at its opposite end to the adjacent end of the cabinet, and normally keeps the door closed. The opposite end of the rod is also bent'at an angle, and is pivotally comiected to one end of a Connecting rod 11, the opposite end of which is pivotally attached to an arm 12, which is rigidly separt of a bracket 15, securedto the topvof "their adjoining edges, withv aperturedflugs cured upon a shaft 13, which extends partially across the cabinet adjacent to its forward end, and through one side of the same,

the projecting end of the shaft being provided with a handle 14. This shaft is journaled in bearings which form an integral the cabinet. The bracket is provided centrally with a depending plate 16,- having guide lugs 17 arranged in pairs at its opposite extremities, and a pair of'bearing lugs 18, at a point between the guide lugs, which support the inner end of the shaft 13, while the shaft is ful'ther su'pported by a bearing 19, which is formed on a depending arm at the end of the bracket adjacent to that end of the shaft having the handle14. A gear wheel 20, is rigidly mounted on the shaft, between the bearing lugs 18, and this wheel meshes with a rack bar 21,, which lies between the guide lu gs 17. The upper end of this rack bar is normally flush with the top of the bracket 15, and its lower end extends a suitable distance below the lower end of the plate 16, and'terminates in an arm 22, which extends at right angles to the bar, and is bifurcated at its outer end;

An arm 23, extends at right angles from near the inner .end of the shaft 13, and nor; mally maintains an approximately horizontal position, and a similar arm 24, extends at right angles from about the central portion of the shaft, and this arm normallymaintains a position approximately midway between a horizontal and a vertical plane.

The arm 24, is adapted to be engaged by a latch 25, when the mechanism is set, as in Fig. 3,'and this latch is pivotally suspended from a suitable bearing 26, secured t6 the top of the cabinet. The arm 23, is adapted to engage the horizontal portion of a depending arm27, which is secured to a horizontally disposed member of a bell crank latch 28, which is pivotally mounted in a bracket 29, secured to the to of the cabinet. The latch member of this be 1 crank, extends up through a slot 30,- in the top of the cabinet, and is adapted to engage and hold a print holding shutter 31, whichis hinged to the rear end ofa cushioned printing frame 32, when said shutter is pressed down upon said frame. plates 33 and 34, which are provided upon 35 and 36 respectively, through which passes a 'rod;37,- which connects the two-plates in uniform throughout.

' springs The shutter comprises two the springs, v or cushion supports for the forward end of hinged relation. This rod is encircled by the oppositely coiled portions of a spring 38, the ends of which are secured in apertures in the lugs 36, while the connecting portion of the two coils is formed into a loop 39, which is secured to the forward plate 33, by a screw 40. The tension exerted by the spring 38, is suflicient to normally hold the plate 33, at an angle to the plate 34, and this angle is defined by a stop lug 41, on one'of the lugs 35, which engages the adjoining lug 36.

The printing frame is rectangular in form, and lies in a correspondingly shaped opening in the top of the cabinet, and is hinged at its rear end to the top of. the cabinet, as shown. Upon the rear end of the frame, is secured a metal plate 42, having a pair of apertured lugs 43, adjacent to each end. An eye bolt-44, is placed between each pair of lugs and a rod 45 is passed through the lugs and bolts. The plate 34 of the print holding shutter is provided atv its rear end with lugs 46, havingvertical apertures through which the eye bolts 44 pass. Coil springs 47 encircle the bolts and rest upon the' lugs 46, and these springs are held under tension by nuts, which are screwed upon the ends of the bolts. loil springs 48 encircle the rod 45, and the forward end of each spring issecured in an apertured lug 49, near the front edge of the plate, while the opposite ends of the springs engage the plate 42. The

tension exerted by the springs 48, normally holds the shutter up and away from the frame, and when the shutter is pressed down upon a glass plate 50, which is supported in the frame flush with its upper face, and upon which the photographic negatives and sensitized paper are placed, its member 34 will first contact with the glass plate, and the member will contact immediately afterward. I

The under sides of the shutter members are, provided with feet pads 51, which insure an even pressure'upon the plate 50, and the springs 47 "permit the shutter to adjust itself to the thickness of the material beneath it, so that the pressure on the said material is Theforward end of the'frame 32,- is normally held at slight elevation above the top of the cabinet by headed rods 52, which pass through vertical the said frame,

the object of which will appear later.

120.- posed between the heads of the rods and at its upper en the glass plate 50, the ro is pushed A socketed lug 57, is formed on the for ward 'end'of the shutter plate 33, through which passes a usher rod 58, having a knob d. A pin 59 passes through the rod, within the socket, and a spring 60 is interposed between the said pin andv the bottom of the socket, which normally holds the pin up against a cap disk 61, which is secured in the top of the socket by set screws. 1

When the shutter 31, is ressed down upon 30, and engages the top of the-rack 21, which down thereby turning the gear wheel 20,.and with it the the arms 23 and 24, which are given a par- -tial revolution. The arm 24, is engaged by the latch 25, while the arm 23 is moved an equal distance 'at the same time, and releases the arm 27, which is then lifted by a spring 62, thereby rocking the bell crank latch 28, passes through an opening 63, in the shutter plate 33, when the plate is depressed, and enga es the rear edge of the said open-' ing, there y holding the shutter down until the latch 28 is rocked to releaselthe shutter,

which operation is accomplished in the 'following manner:' To the forward portion of the floor of the cabinet and centrally of its width, is securedan oil controlled valve 64,

comprising a main vertical cylinder 65, and a branch cylinder 66, which communicates with the main cylinder near the opposite endsof the same. A base plate 67, forms a of the cylinder and bolted to the floor of the cabinet. A c.(p

' through the bifurcated end closure for the lower end of'themain cylin der, and'this plate is screwed upon the end 68, having a central aperture, is screwe upon the upper end 'of the main cylinder. A piston 69, provided 'with suitable packing rings, is located in the main cylinder,'and a rod 70 is secured to the piston and extends through the cap 68, and up ofthe arm 22, at the lower end of the rack bar 21. A cross arm 71 passes through the rod 70, and this arm normally rests upon the bifurcated end of the arm 22, and the piston is thereby maintained in an elevated osition. Vertical rods-71 at the end of the ifurcated arm 22, engage the cross arm 71 and prevent the rod 70 from wisting. An arm 72 projects from the ,upper end of the rod, 70, and when the rod'descends,'this arm 72 isadapted to engage an arm 73, which frojectsfrom 'the atch 25-into the ath o the .said arm 72, whereby the said atch is tripped and the arm'24 released, permitting the shaft 13'and gear 20 to be partiall rotated by the spring 10, through the me ium of the rod 9, connecting rod '11, and arm 12. A spring 74 7 connected at one end to the arm. 73, and at the other to the top of the cabinet, normally holds the latch 25 in position to be engaged 58 enters the slot shaft 13, carrying of the said piston.

portion of the latch, the latch is immediately arm 24, by a suitable stop at its upper end.

arm. The latch is limited in its g The piston 69 is provided with a-vertical aperture or port 75, which extends through it from top to bottom, and a disk valve 76 covers the lower endof the port. This disk valvehas a stem 77, which extends down through a guide sleeve 78 projecting from the step portion'of a bracket 79, which is secured to the bottom of the piston. A coil spring 80 encircles the valve stem and sleeve, and is interposed between the disk valve and the step. A pin 81, inthe base plate, limits the downward movement of the piston, and a pin 82 in the upper end of the piston is designed-to contact with the cylinder cap, and define the upward movement A valve tube 83, is sweated or otherwise rigidly secured in the upper end of the branch cylinder 66, and this tube is providedwith a narrow triangular port 84, which faces the passage connecting the main and branch cylinders at their upper ends. A cut-off valve 85, is snugly but rotatably mounted in the tube 83, and an annular shoulder 86, is formed on this valve, which rests upon the end of the valve tube 83, and limits the downward movement of the cut-off valve within the tube. The lower portion of the cut-off is tubular and open to the branch cylinder, and a port -87, i's formed in the said tubular portionof the cut-off, which. to register with the port 84 of the valve is designed tube. A stem 88 is secured to the cut-ofi'and this stem extends up through the top of the cabinet secured upon the endof the stem and is provided with a knob 01; handle by which-the pointer may be turned to any one of the graduations on the plate, which are numbered from 1 to.15,andindicate a corresponding number of seconds. The valve is and through the axis of a graduated, semi-circular plate 89, and a pointer 90 is filled with oil, as shown in Fig. 4, and when the piston is raised, the oil is forced through its port- 75, and the instant the piston ceases to'move' upward, the disk valve 76 is thrown by its spring 80,-to close the port 75, and

when the piston is permitted to descend it forces the oil up through the branch cylinder and cut-off, whence itpasses through the ports 87 and 84 of the cut-ofl and valve tube respectively, and into the upper end of the main cylinder valve. The time occupied by the descent of the piston is governed by the position of the cut-off-port 87, relatively to the port 84. T'Vhen the two ports exactly register, the piston drops in the shortest period of time indicated on the graduated plate, and as the cut-ofl' is turned so that the rear edge of its port 87, approaches nearer and nearer tosthe narrow end of the triangular port 84, the area of the exit.

responding ratio. A vent tube 91, is screwed in .the upper end of thevalv'e where the main cylinder and branch cylinder communicate.

In the practical operation of the device,

I the casing or chamber is provided with a necting rodll, which opens the door 8, and

suitable lighting medium, such as an electric or acetylene lamp, and before actual printing is commenced, experimental tests are made to ascertain the light power, and the probable length of exposure required for the character of workin hand, and this is accomplished by placing the negative on the glass plate of the printing-frame, and operating the handle 14,-which turns the shaft 13, and gear wheel 20, which causes the arm 24 to engage the latch 25, and lowers the rack bar 21, with its arm 22, which supports the cross arm 71 and holds the rod 10 and piston 69 in an elevated position. At the same time the arm 12, draws upon the conpermits the light from the chamber ,5 to shine into the cabinet, and upon the nega tive, the tone of which determines the prob: able length of exposure necessary for the best results. Meanwhile, the piston descends, until the arm 72 engages the arm 73, by which the latch 25 is tripped, and the parts of the mechanism and thepiston are restoredto their normal position, and the door. 8, is ,closed to shut dut the light from the cabinet, this being accomplished by the spring 1,0 acting upon the hinge rod 9, connecting rod 11 and arm 12. In this test workthe print holding shutter 31 is left open so that the operator may look through the glass plate 50, but when the probable length of time has been ascertained, and the pointer 90 set accordingly, the negative or negatives with the sensitized paper" are placed upon the glass plate 50,- and the shutter 31 is pressed down upon them, in doing this the operation above mentioned is repeated, engagement with the. rack tates the gear wheel of the end of the pusher rod 58,

bar 21,v which partially ro- 20 and shaft 21, looking and only it is now effected by thethe arm 24 tothe latch 25, and lifting. the

arm 23 from the arm 27, which is immediately lifted by the spring 62, whereby the -latch28 is rocked to engage the plate 33 of the print holder, but not until after the said latch has passed through the. opening 63 in'the said plate. The door 8, opens in the manner abovestated, andstands at such an angle as to throw" the light. from the chamber 5 directly up against the glass 'as above described, and arm 23 engages arm 27, which rocks the latch 28 an d reof the door as it opens and closes.

plate 50, and at the expiration of the time indicated by the pointer 90, the piston reaches the limit of its downward move. ment, the latch 25 is tripped by the arm 72,

leases the print holder. y

' When the print holder or shutter is pressed down, it also depresses the forward end of the printing frame 32, upon the is under tension, it insures perfect contact of the same with the print holder, and consequently of the negatives with the sensitized paper; and as the said shutter is released and flies up under the action of its springs 38' and 48, the frame 32 under the upward pressure of its springs 54 will follow it, thus keeping the negatives and sensitized paper firmly pressed together-until after the light has been cut oif by the closing of the door 8. The spring 55, modifies-the action of the springs 54 upon .the cushioning rods 52, and

when the shutter 31 is thrownyopen by the action of its springs 38 and 48, itis retarded in its upward movement, and brought gradually to a stop, by

pivoted at one end'to a post 93, secured to the top of the cabinet, while its piston rod 94 is pivotally attached to a bifurcated lug 95, near the forward end of the shutter plate 34. A strip 96, havingslideway grooves, is. secured upon each side of the bottom of the printing frame 32, in which the vignetting sheets are slipped and supported, and the frame may be lifted for this purpose by a knob 97. A segmental arm 98 is also secured adjacent to one side ofthe door 8,, and this arm is provided with a segmental slot 99,

serves to steady the movement Thesaid door being covered with fabric, is light and. easily operated, and the felt strip. 7, surrounding the opening 4, not only serves to exclude the light when the door is closed, but alsoicushions the impact of the door and 8, travels, and

deadens the sound which would otherwise be caused thereby. 1

The device herein described, provides for accurate, variable, time exposure printing from photo-negatives and the like, and insures a uniform exposure for any desired number of prints for any desired period of time for which the operating valve 15 set.

Having described the invention, what I claim as new and vdesire to secure by Letters, Patent, is:

1. In a photo-printing machine as speci-' fied, the cfmbination with a. cabinet; a

printing frame in the top of the cabinet, and

hingedat its rear end to said cabinet; resili- J .ent supports for the front end of-said frame,

anda two-part print holding shutter. hinged 130 cushioning rods 52, and as the said frame means'of an ordinary pneumatic cush omng cyllnder 92, whlch 1s in which a guide pin 100, secured to the door said frame; of a s ring operated latch for said shutter; a sha an arm carried by said shaft which normally holds said latch in an inoperative -position; means for turning the shaft when the shutter is closed, whereby the said arm releases the latch, which immediately engages and holds the shutter; a second arm on said shaft; a latch in the path of said arm, which engages the same when the shaft is turned; an automatically operating gravity device for tripping said second latch at a predetermined time; a spring shaft, whereby the shutter release the shutter; shutter up;

to the rear end of latch is moved to springs for throwing the and means for cushioning its movement.

' inoperative position; a

when

2. In a photo-printing machine as speci-.

fied,'the combination with a cabinet having a hinged rinting framejn its top; and a print hol er hinged to said frame; of a spring-operated latch adapted to engage the forward end of said print holder; a shaft;

2. gear wheel on the shaft; a rack bar in mesh holder is released; and springs for throwing up the said holder.

3. In a photo-printing machine as specified, the combination witlra cabinet, having a hinged rinting frame in its top, and a print hol er hinged to said frame; of a spring operated latch adapted to engage said shutter is print holder; means for normally holding said latch in an inoperative position; means operated by'the print for releasing said holding means, whereby the latch engages the print holder, and for operating said holding means for moving said latch at a predetermined time to f elease the print holder; and means for throwing the 1print holder up, when released from the .late i 4. In a photo-printing machine as specified, the combination with a cabinet having at its top a hinged printing frame, resili- 'ently supported at its free end; a print holdsprin'gs for normally holding said shutter .up; of a spring-operated latch-for said shutter' a sh aft; :1 gear wheel on the shaft; a melt bar in engagement with the gear wheel; a hand-operated pusher rod on said shutter which depresses said rack bar, when" the closed, and partially rotates the said piston rod elevated; an arm carried by said for reversing the files bac println holder when closed,

silient supports beneath the front end of the frame, and

mmed tune;

. with the latching of the for the shaft; an arm carried by the shaft, which normally holds the latch in an inoperative position but releases the same to engage the shutter when the shaft is turned; asecond arm carried by the shaft; a sprin controlled latch in the path of said secon arm; a gravity valve having a piston rod; an arm carried by the rack bar for normally holding piston rod for tripping said last mentioned latch, when said rod descends; a spring for restorin the shaft to its normal position whereby the shutter is released and it; and means for retarding or accelcrating the movement of the piston rod.

5 In a photo-printing machine as specified, the combination'wi'th' a cabinet, of a frame in an opening in the topof said ca inet, and hinged at its rear end to said cabinet; resilient supports for the front end of said printing frame, which normally hold said frame at an inclination to a horizontal plane; a two-part padded shutter hinged upon the rear end of said frame; springs for normally holding the shutter open; a spring operated latch for engagingshutter when closed; and means for ansaid tomatically tripping said latch to release the v shutter at a predetermined time. I

6. In a photoprinting machine as specified, the combination with acabinet, ofa printing frame hinged at its rear end in'an opening the top of said'cabinet; springsupported rods beneath the forward end of sai printing frame, which normally elevate 1 said forward end; a print-holding shutter hinged to the rear end of said frame; springs for normally holding said shutter open; a s ring operated latch for engaging said shutter when closed; and means for automatically tripping said latch to release the Shutter at a predetermined time.

7. In a photo-printing machine as specifi a cabinet; a light receiving chamber on the rear end of said cabinet; a spring-operated door which normally closes communication between the cabinet and light chanr her; a printing'frame hinged at. its rear end m an opening in the top of the cabinet; re

frame, which normally hold the same at an elevation; a print-holding. shutter hinged to the rear end of the frame; springs for normally holding said shutter up and away from the frame; a spring operated latch for holding the shutter when closed against the frame; means for automatically tripping the latch to release the shutter at a predeterand means for opening the door 'of the light chamber simultaneously shutter.

8. In a device as specified, the combination with a cabinet; a hinged printing frame in the to of the cabinet; resilient supports fdrward end of the frame; a print 130 v means for retarding or accelerating the movement of the gravity device;

9. In a device as specified, the combination with a cabinet; a hinged printing frame in the top of the cabinet; resilient supports for the forward end of the frame; a print liolding shutter hinged to the rear end ofv the frame; a latch for holding the shutter against the frame and springs for exerting an upward pull upon the shutter; of means for tripping the latch comprising a revoluble member; an arm carried by said member; means for partially revolving said member, simultaneously with the latching of the shutter; a latch for engaging said member when thus revolved; means for tripping the latter latch at a predetermined time; and a spring for restoring the revoluble member to 1 its normal position, whereby the arm carried thereby trips the shutter holding latch;

10. In a device as specified, the combination with a cabinet; a printing frame in the top of the cabinet hinged at its rear end; resilient supports for the front end of said frame; a print holding shutter hinged at its rear end to said frame; springs for normally holding said shutter up and awa from the frame; a spring controlled latch. or holding said shutter against the frame;-a light receiving casingcommunicating with the cabinet; and a spring-controlled door for normally closing said casing; of means for tripping the shutter latch, comprising a shaft; an arm carried by the shaft, which normally holds the shutter latch inoperative; means for turning the said'shaft to lift the arm and free the latch simultaneously with the closing of the shutter; a second arm on the shaft; a latch for engaging said second arm when the shaft is turned; a connecting rod attached to the door of the light chamber and to a crank on said shaft; a gravity valve for automatically tripping the latter latch at a predetermined time, whereby the shaft is reversed by the spring of the light chamher door, and the shutter latch thrown to release the shutter; and means for accelerating or retarding the movement of the gravity valve.

11. The combination with a cabinet as specified; a printing frame in the top of the cabinet; a print holding shutter hinged to the saidframe; springs for normally exerting an upward lifting tension on the shutter; and a spring controlled latch for em gaging the shutterwhen closed; of mechanism for freeing the latch at a predetermined time, comprising a shaft; a gear wheel on theshaft; arack bar in mesh with the (gear wheel; a radially disposed ar'mcarrie the shaft in normal contact with the shutter. V

latch to hold it out of operative position; a manually operated push rod on the shutter for depressing the rack bar to turn the shaft and free the shutter latch; a second arm carried by the shaft; a latch to engage said second arm when the shaft is turned; a gravity device for tripping the latter latch, comprising a pair 0 communicating cylinders con-tammg a suitable liquid; a piston in one of said cylinders, having a vertical port; a valve for closing the lower end of said port; a piston rodextending up from said piston; an arm carried by the rack bar 7 for engaging said piston rod and normally holding the piston elevated, and which frees the piston when the rack bar is depressed; an arm at the upper end of the piston rod for tripping the said latter latch when the piston descends; a cut-off in the opposite cylinder for regulating the flow of the circulating liquid as the valve descends; a rod connected with the cut-off and extending above the top of the cabinet; a graduated plate on said cabinet; a pointer on the rod, above the graduated plate; and a spring for restor'ng the shaft to'its normal position when e latter latch is tripped.

12. In a photo-printing cabinet as specified the combination with a hinged print holding shutter; springs for normally holding said shutter open and a spring operated latch for holding the shutter when closed; of a releasing mechanism forthe latch, comprising a shaft; a gear wheel on the shaft;

a rack bar in engagement with the gear wheel; an arm at the lower end of the rack bar; an arm on the shaft for engaging the latch; a second arm on the shaft; a latch for engaging the second arm; ping the latter latch, comprising a liquidcontrolled gravity valve having a piston and piston rod, said rod being in position to en gage and trip the said latch on its descent, and being normally supported by the rack bar arm; means for retarding or accelerating the movement of the valve; means for depressing the rack bar simultaneously with the closing of the shutter, whereby the shaft is partially rotated and held by the engagement of the last mentioned latch with the means for tripsaid second arm of the shaft, and the piston is released; and a spring for restoring the shaft to its normal position, whereby the shutter latch is operated to release the shutter.

13; In a photo-printing cabinet, the combination with a spring operated print holding shutter; a latch for said shutter; means for trippin operatin' said .trlpping means at a predetermine time, comprlsing 'a liquid controlled gravity valve having a piston and V and said latch; of means for a piston rod in cooperative relation to said tripping means; means for normally supporting the piston and rod in an elevated position, and for releasin the piston simultaneously with the closing of the shutter; means for elevating the piston simultaneously with the release of the said shutter; and means for retarding or for accelerating the movement of said piston.

14. In a photo-printing cabinet as specified, the combination with a printing frame hinged at its rear end; of resilient supports for the front end of said frame; parallel slide-ways on the under side of the frame; a hinged spring-operated print holding shut ter in'cooperative relation to said frame; a latch for holding said frame when closed; and means for tripping the latch at a predetermined time to release the shutter.

15. The combination with a photo-printing cabinet, having a hinged printing frame; of a print-holding shutter comprising a pair of plates united by a hinge connection; a yielding hinge connection between the rear end of the rear plate, and the rear end of said frame; springs for lifting said shutter; springs for swinging the forward plate of the shutter upon the rear plate; a latch for holding said shutter down upon the frame; resilient supports for the front end of the frame; and means for releasing the latch at a predetermined time.

16. The combination with a photo-printing cabinet, having ahinged printing frame; of a print-holding shutter comprising a pair of plates united 'bysa hinge connection; a spring for lifting the forward plate relatively to the rear plate; apertured lugs on the rear plate; eye bolts pivotally attached to the rear end of the frame, which pass through said apertured lugs; adjustin nuts on the ends of the bolts; springs on sai bolts interposed between said apertured lugs, and the nuts, and a sprin for raising said shutter; a latch for holding the shutter in contact with the frame; resilient sup orts for the front end of the frame; para lel slide- Ways on the under side thereof; and means for releasing said latch at a predetermined time.

17. In a photo-printing machine as specifled, the combination of a suitable supportreleasing the latch simultaneously with the closing of the shutter; means for holding .position; means for moving said arm and the arm when the shutter is latched; and

means for automatically at a predetermined time. I

In testimony whereof I affix my signature in presenceof two witnesses.

JAMES F. WARE.

releasing the arm Witnesses:

G. SARGENT ELLIOTT, 'ADEIILA M, FOWLE.

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