US1091099A

US1091099A - Photographic-printing machine.

Info

Publication number: US1091099A
Application number: US76183913A
Authority: US
Inventors: Gerhard Vinnemeier
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-04-17
Filing date: 1913-04-17
Publication date: 1914-03-24
Anticipated expiration: 1931-03-24

Description

G. VINNEMEIER.

PHOTOGRAPHIG PRINTING MACHINE.

APPLICATION FILED APR. 17, 1913.

Patnted Mar. 24, 1919 3 SHEETS-SHEET 1.

amomtoz COLUMBIA PMNQGRAPH CO.,WASHINOTON, D. c.

G. VINNEMEIE'R.

PHOTOGRAPH IG PRINTING MACHINE.

APPLIOATION FILED APR.17, 1913.

1,091,099. Patented Mar. 24, 1914.

3 SHEETS-SHEET 2.

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G. VINNE MEI E R. PHOTOGRAPHIC PRINTING MACHINE.

APPLICATION FILED APRJN. 1913.

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COLUMBIA PLANOGRAPH c0.. WASHINGTON, D. c.

UNITED STATES GERHARD VINNEMEIER, or GLAREMORE, OKLAHOMA.

PHOTOGRAPHIC-PRINTING MAGHIN E.

Specification of Letters Patent.

Patented Mar. 24, 1914..

Application filed April 17 1913. Serial No. 761,839.

To all whom it may concern Be it known that I, GERI-IARD VINNEMEIER,

a subject of the Emperor of Germany, residing at Claremcre, in the county of Rogers and State of Oklahoma, have invented certain new and useful Improvements in PhotographioPrinting Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to photography,

and more especially to the printing of the photographs on sensitive paper from plates or films; and the object of the same is to construct a printing machine as an improvement over my prior United States patent numbered 1,044,107, dated December 12, 1912.

To this end the present invention consists in numerous details of improvement which will appear in the following specification and claims, and are shown in the accompanying drawings wherein Figure 1 is a rear elevation of this machine complete, with the back raised and the negative in place, and Fig. 2 is a side elevation of the mechanism above the stand illustrated in Fig. 1. the mechanism shown at the upper portion of Fig. 1, excepting that the back is closed and the ruby screen has been moved aside, and Fig. a is an edge view with the parts in the same position, illustrating means by which light is admitted through the frame from the front. Figs. 5 and 6 are vertical sections on the lines 5-5 of Fig. 3 and 66 of Fig. 1 respectively, Fig. 6 indicating in dotted lines how the doors of the print compartment may be thrown wide open. Fig. 7 is a detail 011 the line 77 of Fig. 3. Fig. 8 is an enlarged longitudinal section through the casing for the screen, taken on the line S-8 of Fig. 9; and Figs. 9 and 10 are horizontal sections on the lines 99 and 1010 of Fig. 5, enlarged to a scale proportionate with that of Fig. 8. Fig. 11 is a detail on the line 11-11 of Fig. -9. Fig. 12 is an enlarged detail in elevation and partly in section, showing the negative holding mecha nism; and Fig. 13 is a section on the line 1313 of Fig. 12. Fig. 14 is a reduced cletail in ele *ation showing the softening screen or mat which may be employed for Fig. 3 is an elevation of printing an oval picture and perhaps for vignetting; and Fig. 15 is an enlarged sec tion on the line 1515 of Fig. 1 1.

Mounted on a support such as a table 1 is an upright box or casing 2 which is closed at its loWer end to form a print compartment 3 and which has an opening or passage a through its upper portion, and secured across this boX is a transverse screen casing 5 in which moves a screen whose frame 6 is divided by an upright central bar 7 into two portions as best seen in Fig. 8, one of these containing a clear glass or being open as seen at S and the other containing a red or ruby glass as seen at 9. The entire frame is about two-thirds the size of the screen casing 5, whereby the screen may be moved to either extreme position therein to bring the clear glass or opening 8 opposite the pas sage 1 in the casing, or the ruby glass opposite the same, according as conditions may require. The back of the screen casing is open as at 10 opposite the opening 4 in the casing, and these registering openings are disposed opposite an opening 11 in an opaque shade 12 hung over a window 13 or the like, although of course artificial light could be employed for printing the pictures.

The numeral 1d designates a walking beam pivoted at 15 'to the back of the casing and having straps 16 passing over rollers 17 and connected as at 18 with the central upright bar 7 of the frame (5, and treadles 19 and 20 are connected by straps or

bars

21 and 22 with said walking beam to permit the latter to be tilted on its pivot so as to move the screen from one position to the other in a manner which will beclear.

The treadle mechanism may be disposed beneath the table or stand 1, so that an operator sitting at the same may place his feet on the treadles and will thereby be enabled to move the screen to and fro and yet have his hands free.

In one side of the box-shaped casing is formed a slot 30 (see Fig. 2) into which may be passed a softening screen as of ground glass or celluloid, or a suitable mat for shaping the contour of the print being made or vignetting its edges, as well known to photographers, as seen in dotted lines in Fig. 10. As shown in detail in Figs. 1 and 15, this mat preferably comprises a frame 31 of sheet metal bent into Ushaped cross section and reinforced along one upright edge to form a thick side 32, the screen of ground glass, celluloid, or the like being held fixedly in this frame as at so that when it is inserted in the slot it softens the print being made. At its outer corners the frame carries clips 34, and its upright bar or thicker side carries buttons 35, and under the clips and buttons may be engaged a mat 36 overlying the screen 33 and whose sight opening may be oval as illustrated in Fig. 4 or ragged around its edges so as to vignette the picture in a well known manner. By providing a series of these mats the size and shape of the print can be regulated as desired. It is quite possible that this detail might be omitted altogether, although I prefer to pro vide the casing with the slot 30 so that the softening screen or mat may be employed if desired.

To the inner face of the upright sides 40 of the casing within the opening or passage 4 are secured strips 41, and across the bottom of said opening is secured a beveled or undercut strip 42; and these strips support a glass pane 43 which is flush with the inner or rear edges of the sides 40 and the strip 42 so that a negative or plate 44 may overlie said pane even though the negative is wider than the pane and therefore needs overlie the sides 40.

The negative holding mechanism best seen in Figs. 12 and 13 comprises a rock shaft 45 mounted in be: "ings 46 and having thumb levers 47 on its extremities, by means of which it may be turned in one direction against the tension of springs 48 coiled upon said shaft with one extremity engaging the casing and the other extremity engaging a negative grip. The latter is by preference formed of a sheet of metal 50 bent around the shaft and riveted thereto as at 51, its

.edges inclosing a rubber strip 52 which is riveted between them as at 53, and the lower edge of the strip itself projecting below the lower edges of said sheet so that it may make contact withthe negative 44 as seen in Fig. 13; and for this purpose the inner ends of the springs 48 are engaged with said grip to throw it normally toward the pane 43. It follows that when a negative 44 is laid upon the latter and moved under said grip, which can. be done by raising the grip by means of either thumb lever 47, the tension of the springs 48 will throw the grip against the negative when the hand is removed from the lever 47, and the negative will be held firmly in place over the clear pane 43 and opposite the

openings

4, 10, and 11. Between said

openings

4 and 10 passes the screen shown in Fig 8, and if the open space 8 thereof stands opposite said

openings

10 and 4, the light shines through the negative; but if the ruby pane 9 of the screen stands between said

openings

10 and 4, the light admitted from the window or other source to the negative will not print a picture.

The mechanism for holding the sensitive paperusually known as the back of a printing frame has several characteristics in common with my former U. S. Patent Number 1,044,107, although it also possesses details of construction which are adapted to the present printing machine.

Said back is made in two

members

60 and 61 faced with felt or cloth as shown at 62 where they contact with the sensitized paper as usual, and these members are connected by hinges 63 and the upper smaller one 60 is hinged at 64 to the frame to support the entire back. The supporting hinge I would form in one long element as best seen in Fig. 3, and in its upper leaf 1 would make an angle 65 so that it could be carried over the top of the casing 2 as shown in Fig. 13. Said leaf is here provided with slots 66 through which pass screws 67 seated in the top bar of the casing, and on these screws are thumb nuts 68 for a purpose yet to appear. The upper edge of the upper member 60 is recessed as at 69 so as to receive the grip of the negative holder as shown in Fig. 13.

The lower leaf of the hinge 64 has a pair of eyes 70 through which passes a cross rod 71, and on the latter is loosely mounted an eye 7 2 at the upper end of a lever 7 3 which is a strip of spring steel having a certain normal curvature for a purpose yet to appear, and a handle 74 at its lower end. A I

spring 7 5 coiled on said rod and engaging the lever throws the latter normally upward as shown in Fig. 6, and the lower end of the lever passes loosely through a keeper or loop 77 projecting from the lower member 61 of the back near the lower edge thereof as seen in Fig. 5. Above the point where the lever engages this loop, the lever carries a pin 78. Below said point in turn the lever carries a keeper 79 for a purpose yet to apinner edge of this partition 1 preferably secure a rail 30 to which the beveled strip 42 is secured as seen in Fig. 11. This rail has an opening 81 as seen in Fig. 9 within which is located a spring catch 32, all parts of which are disposed beneath or behind the 1 plane of the outer face of said rail and therefore beneath or behind the outer edges of the casing so that neither the negative or any sheet of sensitized paper may catch thereon. The tip of the spring catch is disposed in position to engage the keeper 79 of the lever 73 when the parts are closed. The means for supporting this catch beneath the partition 2 are such as will pe mit a slight adjustment of it as seen in Fig. 11.

That is to say, the base plate 83 of the catch is slotted as at Set, and the slots are engaged by bolts 85 having thumb nuts 86 whose action is obvious. If now the operator is printing from very thin negatives such as films, it may be necessary to adjust the spring latch and the thumb nuts 68 which hold the upper leaf of the main hinge 64: so that the

entire back

60 and 61 will stand nearer the pane 43. However, it will not be necessary to adjust the negative holder shown in Figs. 12 and 13, for the grip will clamp a thin as well as a thick negative against said pane.

lVhile the spring catch 82 may be actuated by means of its knob as usual, I prefer to employ an automatic tripping mechanism therefor so as to leave both hands of the operator free. This consists of a double crank shaft 90 rocking in bearings 91 along the right side of the casing, having an upstanding crank 92 at its inner end projecting into the opening 8 of the screen and adapted to be struck by the upright central bar 7 when said screen moves to the right as will be clear from Fig. 10, and said shaft also having at its other end another crank 93 preferably formed with a handle 94 as shown. This crank 93 is connected by a link 95 with the bolt of the spring catch 82, and it follows that when the rock shaft 90 is turned either by its handle 94 or by the striking of the upright bar 7 against its crank 92, the link 95 will retract the spring catch 82 so as to disengage the keeper 79 of the lever 73. At this time the parts stand as seen in Fig. 5, and the release of the keeper 79 from the catch permits the normally bent lever 73 to straighten out; this swings the lower member 61 of the back toward the operator as the loop 77 rides up the lever until it strikes the pin 78, and if the operator be holding the upper member 60 of the back with his left hand, he may inspect the lower portion of the sensitized paper to see how the printing process is progressing. If, however, he does not have his hand on the upper member 60 of the back at the time the lower member is unlatched as just described, the upward movement of the lever 73 is increased by the uncoiling of the powerful spring and both members of the back are carried upward until the sensitized paper is entirely released so that it falls off the negative 44. Attention is invited to the fact that this antomatic unlatching occurs by the movement of the screen to the right so that the ruby portion thereof overlies the negative and cuts off the white light to the same. The operator causes this movement of the screen by pressure on the treadle 20, and therefore he has both hands free to manipulate the rest of the machine and the print being formed.

In order to hold the back raised when it ias been thrown upward by the combined movements of the spring lever 73 and the spring 75, I prefer a second spring catch which we may well call a spring support in order to avoid confusion. This comprises a bracket 96 rising from the top of the casing 2 and having an arm 97 projecting forward and provided with a slot 98,'a strap 99 of the spring steel overlying said arm and having a catch 100 at its front end adapted to engage the lever 7 3 as best seen in Figs. land 2, and a bolt and thumb nut 101 passing through said strap 99 and slot 98 so that the position of parts may be adjusted. With this detail, when the back of the printing frame is released either auto matically or by hand and flies upward as already described, the lever 73 engages the beveled catch 100 and'the parts are held raised as seen in Figs. 2 and 6 so that the operator may gain access to the sensitized paper, the negative and the other parts of the machine; but when he wishes to restore the back to its working position as seen in Fig. 5, he reaches up and disengages the catch 100 from the lever 73 in a manner which will be clear.

The rear wall of the print compartment 3 is composed of two doors whereof the lowermost number 100 is hinged as at 101 to the casing 2, the uppermost door 102 is hinged as at 103 to the upper edge of the lowermost door, and the combined width of the two doors is suflicient to close the front of this compartment entirely as when it contains a number of prints that have not yet been fixed in the proper bath and are there fore liable to become faded and spoiled. These doors are shown closed in dotted lines in Fig. 5, wide open in dotted lines in Fig. 6, and in the various views they are illustrated in full lines in the position which they will ordinarily occupy. That is to say, the lower door 100 is held closed by means of a hook and eye device 104 or other suitable means, and the upper door 102 is held open at an oblique position by a rather long hook 105 engaging an eye 106 in each edge of the door, although I would provide short hooks 107 at both sides to engag the eyes 106 when this upper door is closed as shown in dotted lines in Fig. 5. These details are unimportant, and I might add that both doors will only be opened when the print compartment 3 has become filled or nearly filled with delicate prints, and the operator clesires to remove them with care and pass them to the fixing bath. Ordinarily he can reach into the opening disclosed by swinging the upper door 102 open as shown in full lines, and in its oblique position it acts as the mouth of a hopper to catch the prints that fall off the negative at when the back is released and springs upward as above described. This I consider an important feature of the invention.

W hen the operator desires to inspect the print, he holds the upper member 60 of the back and allows only the lower member 61 to swing upward, and obviously he has one hand free with which to lift the paper off the negative. The latter is held at this time, however, by the pressure of the upper member 60 against the negative, and it is therefore impossible that the sensitized paper will slip on the negative and ruin the picture being made. U11 the other hand, when the operator knows that the paper has been exposed for a sufficient length of time to form a good picture, he keeps his hand off the upper member 60 and by tripping the spring catch 82 he permits the entire back to fiy upward to the position shown in Figs. 2 and 6 which frees the print so that the latter drops onto the door 102 and falls into the print compartment 3 while the operator yet has both hands free with which to reach for another piece of sensitized paper and quickly place it over the negative, holding it there with one hand while he uses the other to disengage the spring support 94L and restore the back 60, (31 to its position for printing. Attention is also directed to the fact that the tripping of the spring catch 82 occurs automatically after the screen has been moved to a position where its ruby pane 9 is over the opening 4 through the casing 2, and therefore the light is cut ofi from the negative as the printing operation is interrupted during the moment or period of time while the operator is inspecting his work. Of course it is possible for him to trip the catch 82 by means of its knob or by means of the handle 94, but a careful operator would not do that at a time when it would ruin a print already partly formed or just put into place. If he will keep his hands off of the catch and the handle, the automatic mechanism will not trip the lever 73 until the ruby pane 9 completely closes the opening 4:. Attention is further directed to the fact that after the operator has made the required number of prints from the negative 141 he has but to lift one of the thumb levers 47 so that the grip disengages the negative, and the latter can be replaced. By causing the thumb levers to stand always beyond the plane of the inner edges of the sides of the casing, a larger negative than the casing itself can be laid across the same and a print taken from any part of this negative. For this same purpose the strips 11 and 1-2 are so cut that the pane 43 is flush with the sides 40 of the casing, though such pane may be removed by first detaching the beveled strip 12 from the rail 80. 1 bevel its upper edge and the lower edge of said pane so that the latter will be held closely in place; and 1 dispose this strip and all parts of the spring catch 82 within the line of the edges of the sides d0 so that the print falling off the negative will not catch on anything but will strike the door 102 which forms the mouth of the print compartment and be automatically guided into the latter. 1f the operator be making prints which require considerable time in their formation, he will doubtless close this door 102 so as to protect the prints already made, and open it only when he is putting another into it and removing the bundle from the compartment to the fixing bath. As above suggested, the light may be that admitted through a window, or artificial light. The use of the softening screen, mat, or vignette, need not be amplified in this connection.

The adjusting mechanism for the main hinge at the top of the back and for the spring catch are obviously for the purpose of setting the entire device nearer to or farther from the pane d3, when the operator is using thin negatives or films instead of glass plate. therwise the details materials and proportions of parts are not essential to the successful operation of the invention.

What is claimed as new is:

1. The combination with a printing frame open at its front for admitting light, a pane across the frame, and spring catch at the bottom of the pane; of a back, a hinge connecting its upper edge with the top of said frame, a spring throwing the back normally upward to open the frame, manually operable mechanism for holding it raised, a keeper carried by said back and adapted to be engaged with said catch when the back is closed, and treadle mechanism connected with said catch for tripping the latter at will.

2. The combination with an upright printing frame having an opening through it exposed to the light, a spring catch at the bottom of said opening, and a hinge at the top of the opening; of a back carried by said hinge and made in two members hinged together, a normally bent spring lever connected'with the upper member, a loop on the lower member through which said lever projects, a pin in the lever adapted to strike said loop as the lever rises and a keeper on said lever adapted to be engaged with said catch.

3. The combination with an upright printing frame open at its front for admitting light, and a spring catch at the bottom of said opening; of a back made in two members hinged together, a hinge connecting the upper member with the top of said frame, a spring associated with said hinge for throwing this member upward, a normally bent spring lever connecting this lever with the lower member for throwing the latter upward, a loop on the lower member and a pin in the lever adapted to strikesaid loop as the lever rises, a keeper on the lever adapted to engage said catch when the back is closed, treadle mechanism for tripping this catch, and a manually operable catch for engaging the lever when the back is raised.

4:. The combination with an upright printing frame open at its front for admitting light, and a spring catch at the bottom of said opening; of a back made in two members hinged together, a hinge connecting the upper member with the top of said frame, a spring associated with said hinge for throwing this member upward, a normally bent spring member connecting this member with the lower member for throwing the latter upward, a loop on the lower member and a pin in the lever adapted to strike said loop as the lever rises, a keeper on the lever adapted to engage said catch when the back is closed, a screen movable across said opening and having a ruby panel, tripping mechanism for said catch actuated by the screen as its ruby panel comes over said opening, and means for moving said screen.

5. The combination with an upright printing frame open at its front for admitting light, and a spring catch at the bottom of said opening; of a back made in two members hinged together, a hinge connect ing the upper member with the top of said frame, a spring associated with said hinge for throwing this member upward, a normally bent spring lever connecting this member with the lower member for throwing the latter upward, a loop on the lower member and a pin in the lever adapted to strike said loop as the lever rises, a keeper on the lever adapted to engage said catch when the back is closed, a screen movable across said opening and having a ruby panel, tripping mechanism for said catch actuated by the screen as its ruby panel comes over said opening, pedal mechanism for moving said screen, and manually operable mechanism for supporting the lever when the back is raised.

6. The combination with an upright printing frame open at its front for admitting light, and a spring catch at the bottom of said opening; of a back, a hinge connecting it with the top of said frame, a spring associated with said hinge for throwing the back upward, a normally bent spring lever connected with said hinge, a loop on the back and a pin in the lever adapted to strike said loop as the lever rises, a keeper on the lever adapted to engage said catch when the back is closed, a screen movable across said opening and having a ruby panel, tripping mechanism for said catch actuated by the screen as its ruby panel comes over said opening, and means for moving said screen.

7. The combination with an upright printing frame open at its front for admitting light, and a spring catch at the bottom of said opening; of a back hinged to the top of said frame, a spring associated with said hinge for throwing the back upward, a normally bent spring lever connected with said hinge, a loop on the back loosely embracing the lever, a keeper on the lever adapted to engage said catch when the back is closed, a screen movable across said opening and having a ruby panel, tripping mechanism for said catch actuated by the screen as its ruby panel comes over said opening, pedal mechanism for moving said screen, and manually operable mechanism for supporting the lever when the back is raised.

8. The combination with an upright print ing frame open at its front for admitting light, and a spring catch at the bottom of said opening; of a back, a hinge connecting it with the top of saidframe, a spring associated with said hinge for raising the back, a normally bent spring lever connected with said hinge, a loop on the back slidably engaging the lever, a keeper on the lever adapted to engage said catch when the back is closed, a screen movable across said opening and having a ruby panel and an upright bar, a rock shaft having cranks at its eX- remities whereof one stands in the path of saidbar so that the shaft is rocked when the ruby panel comes over said opening, a link connecting the other crank with said catch, and means for moving said screen.

9. The combination with an upright print-- ing frame open at its front for admitting light, and a spring catch at the bottom of said opening; of a back hinged to the to of said frame, a spring associated with said hinge for raising the back, a normally bent spring lever connected with said hinge, a loop on the back loosely embracing said lever, a keeper on the lever adapted to engage said catch when the back is closed, a screen movable across said opening and having a ruby panel, a stop in the screen at one side of said panel, a rock shaft having a crank engaged by said stop as the ruby panel comes over said opening, connections be tween said shaft and catch for tripping the latter at this time, a pair of treadles, and connections between them and the screen for moving the latter in either direction.

10. The combination with an upright printing frame open at its front for admitting light, and a spring catch at the bottom of said opening; of a back hinged to the top of said frame, a spring associated with said hinge for raising the back, a normally bent spring lever connected with said hinge, a loop on the back loosely embracing the lever, a keeper on thev lever adapted to engage said catch when the back is closed, a

screen movable across said opening and having a ruby panel, a stop in the screen at one side of said panel, a rock shaft having a crank engaged by said stop as the ruby panel comes over said opening, connections between said shaft and catch for tripping the latter at this time, a pair of treadles, straps connecting said treadles and screen whereby the latter may be moved in either direction, and a manually operable spring catch at the top of the screen for engaging the lever and holding the back open.

11. The combination with an upright printing frame open at its front for admitting light and having a screen casing extending across said opening, a back hinged to the top of said frame, spring means for throwing the back upward to open the frame, and a spring catch for holding it closed; of a screen movable in said casing and having a ruby panel and a stop adjacent the same, treadle mechanism for moving said screen, a rock shaft having a crank at one extremity adapted to be struck by said stop when the panel moves across said opening, and connections between said shaft and spring catch for retracting the same at this time, for the purpose set forth.

12. The combination with an upright printing frame open at its front for admitting light and having a screen casing extending across said opening, a back hinged to the top of said frame, spring means for throwing the back upward to open the frame, and a spring catch for holding it closed; of a screen movable in said casing and having a ruby panel and a stop adjacent the same, treadle mechanism for moving said screen, a rock shaft having a crank at one extremity adapted to be struck by said stop when the panel moves across said opening, and a crank at its other end, and a link connecting this crank with the spring catch for retracting the latter.

13. The combination with an upright printing frame open at its front for admitting light, a hinge having one leaf connected with the top of said frame, a back connected with the other leaf of the hinge and adapted to close said opening, a lever also connected with the last-named leaf and extending across said back, and a spring catch engaging said lever when the back is closed; of a bracket rising from the to of the frame and having a right-angularly slot-ted arm, a spring strap having a catch at its front end adapted to engage said lever when the back is open, a bolt passing through said strap and the slot in said arm, and a thumb nut on the bolt, for the purpose set fort-h.

14. The combination with an upright printing frame having an opening through its upper portion for admitting light and a print compartment at its lower portion, 1

screen casing extending across said opening, a back, means for holding the back closed, and means for holding it when opened; of a pivot in the front wall of said compartment, a walking beam mounted centrally on said pivot, treadle mechanism connected with the arms of this beam, a strap connected with its extremities and leading intermediate its ends over guide rollers, and a screen frame movable in said casing and connected with the mid-length of said strap, for the purpose set forth.

15. The combination with an upright printing frame open at its upper portion for admitting light and having a box-like printing compartment at its lower portion, a door hinged at its lower edge for closing said compartment, and means for latching the door in oblique position so as to form a guide directed into such compartment; of a pane set across said opening, negative holding mechanism at the top oI the pane, and a hinged back for covering the negative.

16. The combination with an upright printing frame open at its upper portion for admitting light and having a box-like printing compartment at its lower portion, a door hinged at its lower edge for closing said compartment, and means for latching the door in oblique position so as to form a guide directed into such compartment; of upright strips within the sides of said frame, a beveled strip across its lower edge, a pane interposed in the opening and resting on the strips and beveled at its lower edge to engage said beveled strip, the face of the pane being flush with the side edges of said frame for the purpose set forth, negativeholding mechanism at the top of the frame, and a hinged back.

17. The combination with an upright printing frame open at its upper portion for admitting light and having a print compartment in its lower portion, a screen movable transversely across such opening, and treadle mechanism for moving said screen; of upright strips within the sides of said frame, a beveled strip across its lower edge, a pane interposed in the opening and resting on the strips and beveled at its lower edge to engage said beveled strip, the face of the pane being flush with the side edges of said frame for the purpose set forth, negative holding mechanism at the top of the frame, a spring-opened back, and fastening means therefor tripped by the movement of said screen.

18. The combination with an upright printing frame open at its upper portion for admitting light and having a print compartment in its lower portion, a screen 1novable transversely across such opening, and treadle mechanism for moving said screen; of upright strips within the sides of said frame, a beveled strip across its lower edge,

a pane interposed in the opening and resting on the strips and beveled at its lower edge to engage said beveled strip, the face of the pane being flush with the side edges of said frame for the purpose set forth, a springactuated shaft mounted in bearings across the top of said pane, a negative-grip carried by said pane for holding the negative against such pane, thumb levers at the as tremities of the shaft, and a hinged back having a recess inclosing said shaft and grip and movable between said thumb levers.

19. In a photographic printing machine, the combination with an upright frame having an opening therethrough, a pane across said opening, and a hinged back; of bearings at the sides of the opening, a shaft journaled in said bearings and having thumb levers at its extremities, a negativegrip of sheet metal bent around and secured to said shaft, and a rubber strip riveted between the edges of said metal grip and projecting beyond said edges, for the purpose set forth.

20. In a photographic printing machine, the combination with an upright frame having an opening through its upper portion and a box-like print compartment at its lower portion, a door hinged at its lower edge to the wall of said compartment, a second door hinged at its lower edge to the upper edge of the first door, and means for holding said second door in an oblique position'for the purpose set forth; of a pane across said opening, a back, means for holding it in position, a spring-closed negative holder across the top of said opening, and means for swinging such holder to release its grip on the negative.

21. In a photographic printing machine, the combination with an upright frame having an opening through its upper portion and a box-like print compartment at its lower portion, a door hinged at its lower edge to the wall of said compartment, a second door hinged at its lower edge to the upper edge of the first door, and means for holding said second door in an oblique position for the purpose set forth; of a pane across said opening, and a back in two leaves hinged to each other, a hinge connecting the upper leaf with the top of said frame, means for locking both leaves when the back is closed, and means for tripping said locking mechanism.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

GERHARD VINNEMEIER. \Vitnesses JOHN T. EZZARD, LEE SETTLE.

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