US2388837A

US2388837A - Print making machine

Info

Publication number: US2388837A
Application number: US450395A
Authority: US
Inventors: Glen M Dye
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-11-07
Filing date: 1942-07-10
Publication date: 1945-11-13
Anticipated expiration: 1962-11-13

Description

Nov. 13, 1945. G. M. DYE 2,388,837

PRINT MAKING MACHINE Original Filed Nov. '7, 1958 6 Sheets-Sheet 1 II I @ve 19w a. DYE

PRINT MAKING MACHINE Original Filed Nov. 7, 1938 6 Sheets-Sheet 2 a 5 X I AZ /Z 13 19450 G. M. DYE PRINT MAKING MACHINE Original Filed Nov. 7, 1958 6 Sheets-$heet 3 PRINT MAKING MACHINE I I I 1 \i @fi/zzi y wazam ,2 0 9 $94 w E 52 u i} lg (5X07 W i Fig. 6.

NQVG i3, 145 DYE 2,388,837

PRINT MAKING MACHINE Original Filed Nov. 7, 1938 6 Sheets-Sheet 5 I752. m @g" Nova 13, 1945. s. M. DYE

I PRINT MAKING MACHINE Original Filed Nov. '7, 1938 e Sheets-Sheet s WK W83 @LZA M 17/5 Patented Nov. 13, 1945 PRINT MAKING MACHINE Glen M. Dye, Minneapolis, Minn.

Original application November 7, 1938, Serial No. 239,269. Divided and this application July 10, 1942, Serial No. 450,395

12 Claims.

This invention relates to a projection printer for making photographic prints or to a machine for making over-sized prints. The machine is designed to make projection prints from negatives of different sizes, which prints will have a size range comprising a very large proportion of such projection prints or enlargements now commercially made.

This application is a division of applicants copending application S. N. 239,269, filed November 7, 1938, now Patent Number 2,291,613, issued August 4, 1942, on Projection printer. While other parts of the machine are illustrated, this invention is particularly directed to a portion of the machine comprising a chamber in which the negative is placed and movable means for giving access to said chamber and for closing the same during the printing operation.

It is an object of this invention therefore, to provide a projection printer having efficient light shielding means including an automatically operated curtain moving to light-obstructing position during the printing period.

It is a further object of the invention to provide a projection printer having a light-shielding means having an automatically operated curtain, which curtain is arranged to be also manually raised or lowered at any time without interfering with the timed operation of said curtain.

It is also an object of the invention to provide a light-shielding means including a flexible curtain movable over an opening through which the negative is placed in position together with means for moving said curtain and. folding the same as it is moved to uncover said opening.

It is more specifically an object of the invention to provide a projection printer such as set forth in the preceding paragraph, said flexible curtain being weighted at its lower edge, the same being secured above said opening and the operating means for said curtain comprising an osoillatable rod engaging said curtain between its top and bottom to fold it upwardly when it is moved to uncover said opening.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings in which like reference characters refer to similar parts throughout the sev- Fig. 4 is a View partly in side elevation as seen from the right of Fig. l and partly in vertical section taken through the lamp box and light casing;

Fig. 5 is a view in vertical section through the front of the printing casing and closing curtain shown on an enlarged scale;

Fig. 6 is a horizontal section taken just above the negative holding means;

Fig. 7 is a view partly in side elevation and partly in vertical section of the driving mechanism, a section being taken through the lower part of the clutch and the enclosing casing;

Fig. 8 is a horizontal section taken through the top of the casing enclosing the driving parts and showing the driving parts in plan;

Fig. 9 is a vertical section taken through the casing enclosing the driving parts showing the driving parts in side elevation, some parts being shown in section;

Fig. 10 is a vertical section through the casing enclosing the clutch showing the clutch and friction mechanism in side elevation;

Fig. 11 is a fragmentary View showing the tripping mechanism for the printing lamp switch;

Fig. 12 is a vertical section taken substantially centrally through the lamp box; and

Fig. 13 is a vertical section taken centrally through the lamp box in a plane at right angles of Fig. 12.

Referring to the drawings a machine is shown comprising a frame including legs 50 shown as four in number. These may be of any suitable construction and are illustrated as of angle shape in cross section tapering toward their lower ends, with the inside of their angles disposed inwardly and secured at their upper ends by screws 5| to a substantially horizontal plate or table 52 having a depending flange 52a extending thereabout with the inner side of which legs 50 engage. A bar 53 of angular cross section extends between legs 50 at one side adjacent their bottoms and another bar or plate 54 extends between the pair of legs at the opposite side adjacent the bottom thereof. A bar 55 shown as angularin cross section is also secured to and extends between the rear legs 50 adjacent their bottoms. A plate 56 having upturned flanges at its edges is secured to

bars

53 and 55 and an electric motor 51 is supported by and secured to plate 56. A pulley 58 is secured to the armature shaft of motor 51 and has a belt 59 running thereover which also runs over a pulley 60 secured to a shaft 6| journaled in a bearing 62a carried on a plate 62. Plate 62 forms part of a clutch frame and is supported upon posts 63 shown as four in number and is secured thereto by headed screws 6d. Posts 63 seat on plate ti; and are secured thereto by the screws 64. Shaft Bl has a worm gear 65 secured thereto which meshes with a worm wheel gear 66 secured to a shaft 61 journaled in a bearing 68 carried by plate 62. A clutch plate 69 is secured to the end of shaft 51 and when the machine is in operation it is continuously driven from motor 51. Plate 69 cooperates with another clutch plate lil adapted to be brought into engagement therewith at certain times and to be driven thereby. Plate 'Iil will have some suitable friction material iiia thereon and is secured to a shaft ii journaled in a bearing I2 carried by plate 56. An arm 33 is pivotally connected to a link it, the other end of which is secured to an arm I having a hub secured in any suitable manner as by pin it to a shaft TI. Shaft TI is journalled in a bearing "5'8 secured in plate 56 and has an enlarged portion above said plate extending into and secured in the lower end of a tubular shaft '59. Shaft it] extends vertically adjacent one side of the machine and is secured to a pulley block I25 to be later described, which has a reduced portion journaled in an opening in a casing top I22a to be later described. The clutch comprising plates at and it is a half revolution clutch, and includes a third plate 8i having downturned ears at opposite sides and to which are secured studs 82 having journaled thereon rollers 83. Plate 3! has apertures at either side through which extend studs 181) secured to and depending from plate 8i Compression coiled springs 85 surround studs lfib engaging plate iii at their upper ends and plate 8! at their lower ends. The plate 55 has spaced openings 55a. thereon spaced the same distance as the rollers 33 and into which rollers 53 are adapted to drop to determine the half revolution period of the clutch. Said clutch is adapted tobe actuated by a toe trigger or pedal 83 oscillatable about the axis of a rod or shaft 8! journaled in small blocks 88 secured to the under side of plate 55. A bar 89 is secured to shaft '8'! by which the trigger plate 86 is carried, and an arm to is secured to and extends rearwardly from bar 8% and carries clutch actuating parts adapted to raise plate 8!. The trigger plate also has upstanding therefrom a stud 9I. A tensile coiled spring 92 is secured at one end to a projection on plate 62 and is secured at its other end to the upper end of stud 9i and said spring acts to hold trigger plate 88 in its raised or inoperative position. When trigger plate 86 is pressed down- Wardly by the toe of the operator to its lower position the clutch makes one-half a revolution and am it also makes a half revolution or rotates through 180 degrees. A box-like cover 56d fits over the flange on plate 55 and forms an enclosure for the motor and clutch parts. The specific construction of the clutch need not be further described as it per se forms no part of the present invention. A casing 50a secured to plate 56 encloses arm 15.

A lamp box is provided, the top of which is formed by a plate or casting 521) which is secured in and in effect forms part of table top 52. Said plate 5% has a flange 520 at its forward end having therein a slot or opening 52d which is continued as a slot through the bottom of plate 52b for some distance. portion 52c therein and a trough 52] is formed at the front portion of the plate 52b between flange 52c and portion 526. Portion 52c is apertured and has a depending cylindrical flange 52g extending downwardly therefrom. An annular flange 52h Said plate 522) has a raised F is formed in portion 52c and forms the support for a lens 93. Said lens may be positioned on a resilient annular strip 94 shown as circular in cross section. Said lens 93 is held in position by a plate 95 which may be made of any suitable material and in practice has been made of Masonite. Plate 95 is secured to portion 52c by countersunk screws 95b. A small bracket 96 is secured to the underside of plate 52b at its forward portion by small screws 95a and has a lip extending downwardly and inwardly substantially at a 45 degree angle. A front plate 9? is provided for the lamp box, the same having a latch Sla pivoted thereto by a pivot member 97b, said member 98 being adapted to be moved over the inner side of bracket 96 to hold plate 9'? in closed position. Plate 98 has small brackets Ql'c secured thereto, the same being offset to form lips directed toward each other and to extend over a mirror 98 which is thus secured to the inner side of plate 9?. Plate 91 is hinged by a hinge I99 to the vertical stationary front side plate Ill Ia of the lamp box casing IUI. Side plate Itla has secured thereto adjacent its bottom a resilient cushion block Iilfla against which plate 91 will engage should it be dropped. Casing IilI has a bottom plate IDIb having an aperture IIiIc therethrough, one function of which is to admit cool air into the lamp box. The lamp box also comprises side plates IiJIcZ which engage the outer side of flanges 522' formed on plate 521} and to which they are secured. Brackets I62 illustrated as formed from angle members are secured to side plates I Md and extend across the lamp box adjacent the bottom thereof. Headed screws I03 extend through the lower part of bracket I02, being held therein by nuts I 54, said bolts also extending through a plate I and being equipped with wing or thumb nuts Iii3a beneath plate I95, said nuts thus holding said plate in position. Plate I05 is centrally apertured and forms a seat for a ballmember Nita formed on a rod I06 which extends through the bottom of the lamp box through opening Nile and carries at its upper end the lamp socket I060 in which the printing lamp I0! is secured. Rod I06 has a handle IOBb at its lower end. A stationary contact member I880. forming one part of the printing lamp switch IE8 is carried on a small angle bracket I09 secured to one side plate Hill). The movable contact I082) of switch IE8 is carried on a pin IIU slidable vertically in a slot in side plate HlIhplates I II of insulating materialbeing disposed at the inner and outer sides of side plate Hill) and moving with and forming in effect guide members for pin IIil. Pin I Ii] extends through a vertically movable bar H2, said pin having a head formed thereon at the outer side of said bar and having a small cotter pin II3 extending therethrough at the inner side of inner plate III. Bar IIZ extends downwardlythrough a slot 62a in plate 62 and has formed therein a notch 2a adapted to engage with plate 62. at one side of slot 62a as shown in Fig. 12. Bar I I2 has. adjustably secured thereon a block, I IZb held in place by a screw I [20 and said block is adapted to be engaged by a projection 830: on one of the rollers 83 in the revolution of plate 8 I. This disengages notch II 2a from a plate 63 and bar H2 is moved downwardly by a washers IOI f are disposed under the nuts on bolts IOId and clamping members 93b which may be of resilient material, are disposed under the heads of the nuts on bolts IOId' and engage lens 93a. It will be seen from Fig. 12 that lenses 93 and 93a are flat on one side and have convex surfaces at their other side, said convex surfaces being directed toward mirror 90. A flat casing IOIh is disposed below plate 52b above lamp I01, the same containing insulating material IOIz'. Said parts are provided to prevent the heat from lamp II unduly heating plate 52b thereabove. An opening IOIa' leads from the upper part of the lamp box and communicates with a vertical flue IOIIc which extends upwardly to the top of the machine. While said flue may be of any form, in the embodiment of the invention illustrated it is shown as rectangular in cross section.

The member a has an opening therein through which the light for printing passes and the top surface of member 95 forms the supporting surface for the negatives such as films which are to be printed. A negative holding means is provided comprising a rotatable plate or turret I I5. Plate I I5 is rotatably mounted on a pin I I6 secured in member 521) and is arranged to be raised by a sleeve IIl disposed therebeneath and slidable on pin HE. A rest for plate H5 is provided comprising a headed screw I I5d adjustably threaded into member 52b and adapted to be held in adjusted position by a lock nut II5b. Sleeve H1 is adapted to be lifted by a lever II8 having end portions disposed in opposite sides thereof, said lever having parallel spaced portions joined at their ends remote from sleeve 1. Lever H8 is arranged to tilt about a fulcrum member II9 carried on member 52b. An operating means for plate H5 is provided and comprises a knee-operated lever I having a, horizontal portion I20a journaled in bearings I2l secured to the underside of table 52, said portion being bent at its end substantially at a right angle, and disposed to overlie the closed or outer end of lever I I8. Lever I 20 also has an outer downwardly extending portion I201) formed with spaced parallel sides, which portion is contacted by the knee of the operator. While lever I20 may be of any suitable form, in the embodiment of the invention illustrated it is shown as made from a round rod. It will be seen that by pressing laterally on portion I201) plate I I5 will be lifted and it can then be easily rotated about pin II6. Plate II5 has quite a number of circumferentially spaced openings II5a therethrough adjacent its circumference, which openings are of different sizes and shapes. Openings II5a are thus adapted for use with negatives of different sizes and are adapted to determine different areas to be printed. Flat spring members I I50 are secured at either side of one of the openings II5a and press on plate H5 at the sides of said opening, said springs being adapted to hold certain small films or to engage a special holding means for a Very small film such as a strip film from a motion picture camera. Plate H5 is adapted to be held or locked in position with one of the openings II5a over the light opening 95a and for this purpose said plate is provided with a plurality of holes 511, there being one for each opening I I511. When the respective opening II5a is in proper position relative to the light opening the corresponding hole 511 receives a pin II 56 which upstands from member 5211. When the plate I I 5 is lifted for rotation it is lifted clear of pin II Be. A casing I22 having a substantially horizontal top I22a spaced a short distance above table 52 extends over holder N5, the same having outwardly and downwardly sloping sides. Said casing I22 is open at its front for the insertion and removal of the negatives and also has its top I220 offset upwardly at said front. The open front portion of casing I22 is closed during the printing operation by a flexible opaque curtain I23. Curtain I23 is weighted at its lower edge in any suitable manner as by having a metal rod secured thereto at said edge. In the embodiment of the invention illustrated curtain I23 is shown as formed of a folded piece of material and a bar I23a is disposed in the bight or lower folded portion of the curtain and forms the weight for the edge thereof. Said curtain and weighted edge overlap at their ends the downwardly and outwardly sloping front portions I22b of casing I22 which are disposed at each side of the opening in its front as shown in Fig. 6. Curtain I23 is moved to open and closed position by a crank rod I24 having the portion I24a extending across the underside of said curtain, said rod having portions I24b journaled in bearings in casing I22 at each side of said curtain. Portions I24a and I241) are parallel and spaced about half the vertical width of curtain I23. One portion I24b at the left of Fig. 3 is extended and has secured thereto a pulley I25. A belt I25a runs over pulley I25 and turns through a right angle to run in a groove I261) in pulley block I26. Block I26 is secured to the tubular shaft I9 by a set screw. A cap I26d is clamped to block I25 having ears depending at one side thereof to receive a clamping bolt I260. A shaft I21 of polygonal shape in cross section illustrated as of hexagonal shape fits in a corresponding aperture in cap IZBd and is driven thereby from tubular shape 79 through block I26. Cap 126d may be adjusted to vary the position of shaft I2'I relatively to shaft 1.9 for a purpose to be later described. The belt I25a is secured to pulley block I28. Crank rod I24 is oscillated through substantially degrees at the beginning and end of each printing operation and moves through slightly more of a revolution than is necessary to operate crank rod I24 and raise and lower curtain I23. Belt I25a may slip on pulley I25. The curtain and crank I24 may be operated manually at any time if it is desired to look into the opening in casing I22. This can be done without throwing the operation of crank I 24 and curtain I23 out of step or synchronism with the machine. The belt I25a will merely slip on pulley I25 and said pulley and crank rod will again be operated at the proper time in the operation of the machine by belt I25a from block Two rear rods I30 and forward rods I30a and I301) are secured at their lower ends in top I22a and extend vertically to a three sided yoke I3I having forwardly extending parallel sides spaced at their front ends. While yoke I3I could be variously made, in the embodiment of the invention illustrated it is shown as in the form of a channel with its open side directed downwardly. The forward rod I30a is rectangular in cross section and has a groove I300 rectangular in cross section at its inner side. Rod I30?) is illustrated as rectangular or substantially square in cross section. Rods or posts I30, I30a and I30b form guides on which are slidable two assemblies, one of which carries the projecting lens and the other and upper of which carries the paper supporting and handling mechanism. The first of said assemblies includes a plate or lens carriage I32 having a rather long portion I32a carrying spaced and is quickly turned to bring the desired opening Ha in forward position. A negative is placed beneath the opening I I5a and lever I is released. Plate H5 then descends holding the negative firmly on the top of plate 95. The interconnection between the paper carriage I and the lens carriage I32 is so designed that the lens unit I33 is always brought to proper position so that the projected image will fill the mask opening. The

. paper is now placed in position. The operator now presses on the trigger plate 86. This, through arm 84, raises the plate 8|, bringing the lower clutch plate I0 into engagement with upper clutch plate 69. The clutch is now engaged and rollers 83 have been raised out of the slots a and rotate about on the top of plate 55. When the lower plate I0 begins its movement arm I3 is rotated and this, through the link I4, rotates the arm I5. As above described, this rotates shafts 13 and I2? as well as shaft I65. The platen holder I12 is now swung down to paper holding position. At the same time the printing member is pressed against the paper on the non-emulsion side and the identifying character is printed on the paper. This character is usually the same for all of the prints on the particular order. This number of course, may vary as directed by the customer. As the platen reaches its position on the paper plate switch I08 is closed. The closing of switch I08 lights the printing lamp I07. As shaft I27 rotated during the operating of the platen block I26 was rotated and this, through belt I25a, rotated pulley I25, thus moving crank rod I24 and lowering curtain I23 to its closed position. Curtain I23 thus closed the opening of casing I22 before the printing lamp was lighted. When the printing lamp is lighted the image as stated, is sharply focused on the printing paper. When the clutch is engaged it makes a half revolution and arm I3 is again rotated, which through the mechanism described, operates shaft I21 and also as above described, shaft IE5 is operated. This raises the mask carrier and platen together lifting the print and discharging it rearwardly. The mask carrier is returned to print receiving position and the platen remains in its rearward position. When platen holder 12 swings upward shaft I2! rotates and this through belt I25a as above described rotates pulley I25 moving crank rod I24 and swinging curtain I23 to position to uncover the opening in casing I22 and to the position shown in dotted lines in Fig. 5. The print slides from the platen against panel 2I8 and then drops onto deflecting plate H9 and is guided into tray 220. The operation is quite rapid and the making of prints is only a matter of seconds. The lighting system illustrated is that using a projection lamp and condenser lenses which are the lenses 93 and 93a. As stated, these are planoconvex lenses. The lens 93a directs the rays in substantially straight lines against mirror 98 by which they are reflected upwardly into lens 93 which focuses the rays for direction into the lens unit I33. The projection lamp is extinguished a sufficient time before the print is raised for discharge that no difiiculty is experienced with afterglow from the lamp.

The lamp box is ingeniously made for easy access and cleaning. When the hinge side 91 is swung downwardly the lenses 93 and 93a may be cleaned or polished as can also the mirror 98 and access can be had into the casing IOI if desired. The rear side of the lamp box casing IN is removable as indicated by the dotted lines in Fig. 12. This gives easy access to the inside of the casing and lamp bulbs I01 and I0Ia may be replaced when necessary. Easy access is thus also had to the switch I08. It is necessary to accurately position the printing lamp I 01 relatively to lens 93a. The bulbs used may be of different sizes and the filaments vary in different bulbs. Rod I06 is slidable frictionally through ball N611 and this movement together with the universal movement possible with ball I 06a in the plate I05 gives all the necessary adjustment. The ball I06a is made in half sections which are clamped on rod I06 by bolts I03 and the nuts I02a. One section has a hole for rod I00 extending centrally therethrough while the other section has the hole for rod I06 extending to an acute angle to the flat side thereof. The adjacent flat surfaces are then at an angle to each other. When the sections are clamped together by nuts mm the ball exerts a pinching effect on rod I06 thus holding the same and lamp I0! firmly in adjusted position.

The lamp box is ventilated to prevent excessive heating by cool air entering through the opening IN 0 and passing around the partition carried on brackets I 02 as shown in Figs. 12 and 13. This partition forms a sort of a flue at the bottom and side of the box and the cool air then passes into opening I0 I j and into the flue I0 I10 which extends to the top of the machine. There is enough height to the flue to get a good draft and the ventilating is quite effective.

The masks used can conveniently be kept in the compartments 285. The work order envelopes containing the films for each order can conveniently be placed in the compartments 281. The drawers 283 contain the print paper and paper of different speeds will be contained in the compartments 283D. The drawers can be conveniently positioned on the shelf 284 so. that the paper is within easy reach of the operator. Another important feature of the machine is the trough formed in the rear of flange 520. As the work is finished on each negative the operator can merely push the negatives forwardly so that they drop into said trough. When the particular order is finished the operator can reach into the trough with the thumb and finger through the opening 52d and grasp the pile of negatives between the thumb and finger so that they can be easily and quickly removed as a group. This adds to the rapidity of the operation.

The negative holder holds each negative in the exact center of illumination. The negative holder being operated by the knee-operated lever leaves the hands of the operator free for other uses.

From the above description it will be seen that I have provided a very efficient and compact machine by means of which enlargements or oversized prints can be made with great ease and speed. The machine has been amply demonstrated in actual practice and found to. be very successful and eflicient. It is being put into commercal production.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicants invention, which generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is: 1. A machine for making photographic prints having in combination, a frame, a member supported on said frame having a negative supporting surface and having an aperture therethrough for the passage of light, said frame comprising a casing having an opening therethrough adjacent saidaperture, a lamp for printing and radiating light through said aperture, movable means for engaging a negative on said surface, means for illuminating said lamp, a curtain movable over said opening during the printing period, means for lowering said curtain for covering said opening during the printing period and for raising said curtain after the printing period, all of said means being operated in timed relation, said last mentioned means including a slipping driving element whereby said curtain may be manually raised or lowered at any time without interfering with the timed operation of said curtain.

2. A machine for making photographic prints having in combination, a chamber in which a negative is supported for printing, a source of light for printing from said negative, said chamber having an opening through which a negative may be placed in position, a flexible curtain movableto a position closing said opening and supported at its upper edge so as to depend over said opening, a rod extending across said curtain and means for oscillating said rod to engage the intermediate part of said curtain and fold it upwardly after the printing period.

3. The structure set forth in claim 2, said ourtain having weighted means adjacent its lower edge.

4. A machine for making photographic prints having in combination, a chamber in which a negative is supported for printing, a source of light for printing from said negative, said chamber having an opening through which a negative may be placed in position, a flexible curtain movable to position to close said opening and supported at its upper edge, a crank rod having its intermediate offset portion extending across said curtain at the underside thereof and means for oscillating Said crank to engage and fold said curtain upwardly.

5. A machine for making photographic prints having in combination, a chamber in which a negative is supported for printing, a source of light for printing said negative, said chamber having an opening through which a negative may be placed in position, a member of flexible sheet material constructed and arranged to be moved to cover and uncover said opening, means for energizing said source of light and means operated in timed relation to said means for moving said curtain to cover said opening, said last mentioned means including a slipping element whereby said curtain may be manually moved without interfering with the subsequent timed relation.

6. A machine for making photographic prints having in combination, a frame, a member having a negative supporting surface and having an aperture therethrough for the passage of light, said frame having an opening therein adjacent said aperture through which a negative is placed in position over said aperture, a lamp for printing and radiating light through said aperture, means for illuminating said lamp, a flexible curtain movable over said opening and means for moving said-curtain before and while said first mentioned means is actuated, said curtain being flexible and said last mentioned means being constructed and arranged to fold said curtain as it is moved to uncover said opening.

'2. A machine for making photographic prints having in combination, a frame, a member-having a negative supporting surface and having an aperture therethrough for the passag of light, said frame having an opening therein adjacent said aperture through which a negative is placed in position over said aperture, a lamp for printing, and radiating light through said aperture, means for illuminating said lamp, a flexible curtain movable over said opening and means for moving said curtain before and while said first mentioned means is actuated, said curtain being flexible and weighted at its lower edge, the same being secured above said opening, said second mentioned means comprising an oscillatable rod engaging said curtain between its top and bottom to fold it upwardly when, it is moved to uncover said openings.

8. A casing having a chamber therein, a negative supporting member within said chamber, said chamber having an opening therein at one side through which a negative may be entered into said chamber, said casing sloping downwardly at the sides of said opening, a flexible curtain supported above said opening and adapted to depend thereover and rest against said sides by gravity during the printing period and means for moving said curtain to position above said opening to uncover said opening after the printing period, said last mentioned means comprising a swinging member engaging the underside of said curtain and moving it to position above said opening.

9. A machine for making photographic prints having in combination, a stationary casing having a chamber therein, said casing having an opening at one side into said chamber having downwardly sloping side walls, a negative supporting means in said chamber for supporting a negative entered therein through said opening, means for projecting light through said negative and into said chamber during the printing operation and means for closing said opening during said printing operation comprising a flexible foldable curtain arranged to cover said opening and engage said side walls in extended position and means engaging said curtain lifting the same and holdingit in folded position above said opening when a negative is to be entered through said opening.

10. A machine for making photographic prints having in combination, a, stationary casing having a chamber therein, said casing having an opening at one side into said chamber, a negative supporting means in said chamber for supporting a negative entered therein through said opening, means for projecting light through said negative and into said chamber during the printing operation and means for closing said opening during said printing operation comprising a flexible foldable curtain secured at one edge above said opening and constructed and arranged to extend at full length across said opening during the printing operation and means engaging said curtain between the ends thereof lifting the same and folding it substantially into half its width above said opening to uncover said opening when a negativ is to be entered through said opening.

11. A machine for making photographic prints having in combination, a casing having a chamber therein having side walls, said casing having an opening at one side into said chamber, a negative supporting means in said chamber for supporting a negative entered therein through said opening, means for projecting light through said negative and into said chamber during the printing operation and means for closing said opening during said printing operation comprising a flexible foldable curtain secured along one edge across the top of said opening and having a weighted edge at its opposite side, said curtain being constructed and arranged to drape at full length across said opening and engage said side walls during th printing operation and a swing-' ing member engaging said curtain substantially midway between said edges, lifting and folding said curtain and moving it to a position above said opening when a negative is to be entered through said opening,

12. A machine for making photographic prints having in combination, a chamber in which a negative is supported for printing having side walls, a source of light for printing from said negative while in said chamber, said chamber having an opening therein between said walls through which a, negative may be placed in printing position, a member of flexible foldable material constructed and arranged to be moved over said opening, said curtain extending along and being swingingly attached at one side of said opening, and means for moving said member about said side and folding the same at the opposite side of said opening to expose said opening and moving the same into extended condition across said opening to close said opening. GLEN M. DYE.