US827954A - Photographic-printing apparatus. - Google Patents

Description

PTENTED AUG:

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APPLIATION FILED DEG. 2, 1.905.

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WILLlA'M L. BIERBRAUER, 0F HOBOKEN, NEW' JERSEY, ASSliGNOR TO EUGENE DIETZGEN GOMPANLOF CHICAGO, LLlNUlS, A. CGRPO- RA'llON OF lLLlNOlS.

PHoroe'RAPl-uo-Pmmrme appenni-iis..A

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residing at West Hoboken, in the county of Hudson and State of New Jersey, have invented a certain new and useful Improvement in Photographic-Printing Apparatus, of

which the following is a specification.

` My invention relates to photographic-printing apparatus commonly known as blue- -printing apparatus; and the general object of the invention is to provide means for ex-y i oeditiously forcing the backing into' close contact with the glass pane.

in one well-known type of blue-printing,

frame the contact between the sensitized paper and the tracing is obtained b placing a diaphragm or imperforate blan ret behind the sensitized paper and subsequently exhausting the air from between the diaphragm andthe ane'. AThe pressure of the atmosphere acting upon the bach of the diaphragm thus forces it toward the pane and holds the tracing and sensitized pa er in close'` contact the pane in an apparatus operating upon this principle it is necessary, oi course, to provide some meansy for preventing the leakage of air from between the diaphragm and the 4pane around the edges of the diaphragm; and the specific object of` this invention is to provide a frame or marginal rim for the diaphragm for holding down l the edges thereof and advantageous means for forcing the said frame or marginal rim toward the pane. i

Part of the object of the invention also is to provide mechanism whereby the entire side or end of the frame or a considerable part of it may be fastened down at a single operation by the movement of a ,single controlling inember. ri`his relieves the operator ofthe necessity of having to go separately to each of the several points of fastening along the edge of the frame to fasten the frame down at such points. p p

My apparatus consists of two interfitting i frames, and as contributory to the main ob ject it is also an object of the invention to provide fastening means so constructedv that they will disappear into the outer frame. when in non-active position. This permits'the in' ner frame to be withdrawn from. the outer 'Specification of Letters Pfatent. y pplicationiled December 2.1905. Seiial'ftoK 290007.

'the operating-handle and ratchet.

Patentes aug., 7. isos.

one without interference from said fastening means..

it is also an object of the invention to provide mechanism whereby the fastening means may be readily set and released and be secure in its position when set. v i

li attain my objects by the mechanism illus@ trated in the accompanying drawings, in whichi Figures l and 2 are back orbottom. views of dii'ierent frames embodying my invention.

llhe views are taken from the face opposite to the .one eX osed to the sun' or other source of light during the rinting process. For convenience of description this will be referr'ed to as the back side of the apparatus.

Fig. i shmvs a double typeof iframe-that is to say, one havingtwo operatingrods on each side, each rod having its' respective handle and the handles being located at opposite ends of the frame. This frame also has a separate operating-rod for each part of the frame. Fig. 2 is a single and a smaller frame requiring operating-rods at the side only and each operating-rod extending the entire length of the frame, thereby necessitating but a siigle operating-handle. Fig. 3 is ,an end view of the frame looking, in the direction of the arrow at A, Fig. i., and showing Fig.. 4- is a back view oi a corner of the frame, showing the operating-handle and ratchet device.`

frame-as, for example, looking in the direction of the arrow at B, Fig. 1`showing the operating-.rod in active position upon one of i the cushionesprngs of theinner frame. ilig. 7v is a sectional view taken; on iine 7 7, Fig. i, showing the journai-bearing at the inner end of the operating-rods in the double type oi device. Fig. 8 is a iace view of said bearing, the

view being taken in the direction of .the arrow C, Fi ."1. ,Fig 9 is a view from the inside of the ame, showing the construction of the corner and the yrelative locations of the side and end operating-rods, the end rods being elevated above thefside rods for noneinterference with the latter. Fig. 10 is a fragmentary sectional view illustrating a possible construction of the connection between thediaphragm and the tube through which the 11, the other end being rigidly fastened' by i 'air is exhausted from beneath said diaphragm. Fig. 11 is a'face view of a-cushion spring, illustrating the slotted construction at the end thereof. f Similar letters refer to similar throughout both views.

Referring first to the simpler type of apparatus shown in Fig. 2, the outer frame conparts sists of walls a, having an inwardly-projecting ledge a for supporting the glass pane b. Fitting more or less 'closely within said outer frame is an inner frame c, upon the back whereof at frequent intervals are mounted cushion-springs c. By preference these springs are arched flat springs, and in order to enable themto yield without buckling when pressure is exerted upon them from' behind one end has a slot c2, as shown in Fig.

means of a pin or screw 03. A pin or screw c, having a head wider than said slot, penetrates the same and enters into the back of the inner frame, which holds it. By this construction when the spring is straightenedy under pressure its slotted extremity slides under the head of pin or screw c4; thus enabling the spring to straighten without breaking or tend- -lng to loosen and pull out its fastening devices. The use of springs is not essential in this ap aratus; but such springs are useful in that -t `ey tend to distribute the pressure more evenly over the frame` and minimizethe effect of unequalities or variations of adjustment of the members which act upon them. The distance from one spring to another will depend u on the stiffness of the inner frame,

` and in t e case of a small apparatus, vas

shown-in Fig. 2, it ma be unnecessary to provide any springsat t e ends of the frame,

the necessary pressure beingl transmitted from the side' portions of the same.

vExtending..across the inner frame in'position to lie adjacent 4'to the back. of the glass pane b isadiaphragm d, which may consist of arubberblanket-'or any fabric which is airproof. Said diaphragm makes air-tight contact with said inner frame, or at least is se,-

cured thereinin such manner as to make airtight connectionv therewith when the inner frame-is forced down. upon the backof the glass pane t. l,

The pressure members, which are adapted` j to. act-:upon the back of the springs c to force whic -theinner frame toward the pane, consist in may not interfere with the inner frame c gitudinally on the inside and said rods are mounted Within them, as best shown in Figs.

5 and 9; Besides the recess or rabbet a.6 for the rods e are the vertically-extending recesses or rabbets a2 for receiving said fingers e when the latter are rotated to'raised position, as indicated in dotted lines, Figs. 5 and 9.

Rods e are journaled, preferably, in end plates a3 a", which for convenience may be located on the outside surfaces of the outer frame at the ends thereof. At the end of rods e outside of the frame is rigidly secured an operating-handle (Shown in detail in Figs. 3 and 4.) A awl or dog f is pivoted to each of said han les in position to engage the teeth of a ratchet plate or quadrant a5, rigidly secured to the 'end plate a4. A springinfluenced latch or finger-piece f is mounted upon said handle f and connected to pawl f to -release the same in the well-known manner. This ratchet .device is so arranged that when the handles and rods e are rotated in direction to lower the fingers e upon springs c the teeth of the ratchet will automatically engage pawl f and retain the parts in set position; vbut when pressure is exerted upon the latch f 2 the pawl will be released from'the ratchet-teeth andpermit the fingers to be rotated toraised-position, as shown in Figs. 5 and 9.

Suitable means for exhausting the air from beneath the diaphragm are indicated in Fig.

10. The diaphragm d is apertured at one or more points, and at such points an eyelet g is secured, each eyelethavingan upwardly-extending neck g, over which may be slipped a rubber tube h. Said tube will be connected tol the receiver of an exhaust-pump. The pump is not shown, as it forms no part of the present invention.

. The'double or multiplex type of apparatus illustrated in Fig. l is the same as that shownzin Fig. 2 and hereinabove described, except that there are two operating-rods@ on eachside of the frame andthere is an operating-rod at each endofthe frame. -This type is: designed foruse-where the frame is so long that axsingle operating-rod would'not have sufficient resistnace to torsional lstrain to hold all of itsingers-down tight enough upon the'inner frame. In this multiplex type itis necessary. to providea journal-bearing for the inner ends of the voperating-rods where they come together, and such a bearing is illustrated in Fi'g-f8. It consists merely of two plates or journalsi i, secured in proper position in the outer frame.

,When end rods are employed in addition to the side rods, as ,shown in Fig. A1, it is necessary to offset them so that one will not interfere with the other where they cross at the corners of the frame. These relative positions are illustrated in Figs. 5, 7, and 9.

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- the glass pane is. turned to reverse position tized paper on top of it, has been laid upon with its back lying upward, as shown in Figs. 1 and 2. After the tracing, with the sensithe pane, the diaphragm or blanket d is superimposed and the inner frame c is lowered into position in the outer frame.

lower the fingers e upon the equalizing or cushion springs c. Suhcient pressure is eX- erted upon the handles to bring the inner frame and diaphragm down close upon the pane to thereby make air-tight contact at the periphery of the diaphragm. rlhe air is then exhausted through the tube h, and the atmospheric pressure acting upon the back on outer surface of thediaphragm holds the tracing and sensitized sheet in close contact with each other and with the glass ane b. The frame is then turned over and its face exposed to the sun or electric light for printing, after which the frame is turned back again to the original position. The operating-handles f are then released, and the inner frame is lifted out, thus aiiording access to the sensitized paper.

What 1' claim as new, and desire tosecure by Letters Patent, is-

1. Photographic-printing apparatus comprising a glass pane, an open frame adapted tosupport the same, an air-tight diaphragm designed-to lie back of the glass pane, an 1nner 4'frame adapted to lie back of said diaphragm, pressure members mounted in said oute'r frame `in position to press upon said inner 4frame toffo'rce the same against said diaphragm, and means for operating a plurality of said pressure members in lunison.

2. Blue-printing apparatus comprising a glass pane, a frame having ledges thereon against which the edges of the glass may lie, a backing adapted to lie back of the glass, an

. operating-rod running along the frame near the edge of the backing, and a plurality of ingers rigidly set on said rod for forcing said backing toward the glass.

-3. Blue-printing apparatus comprising a glass pane, an outer frame having ledges thereon against which the edges of the glass may lie, a backing adaptedto lie back of the glass, a rod running along the frame near the edge of the backing, a handle for operating said rod, and a plurality of ingers'for acting upon said backing, said fingers being secured to said rod, whereby all of them are operated from said handle.

4. Blue-printing apparatus comprising' a glass pane7 an outer frame having ledges thereon against which the edges of the glass may lie, a backing adapted to lie back of the T he han-l .dlesf are then rotated to such position as to ed to support said glass, a rod running along the frame near the edge of the backing, a plurality of fingers operative upon said backing and rigidly set on said rod, ya handle for rotating said rod for operating said/fingers, and a ratchet device for retaining said rod in selected position.

5. Blue-printing apparatus comprising a glass pane, a frame having ledges thereon against which the edges of the glass may lie7 an inner frame adapted tolie back of the glass, a rod running parallel with the edge of the frame and extending to the end thereof, a plurality of iingers mounted on said rod for acting upon said inner frame and a handle secured tov said rod outside of the outer` frame at the end thereof ifor operating said rod.

6. Blue-printing apparatus comprising a glass pane, an outer frame having ledges thereon against which the edges of the glass may lie, a backing consisting, of -an inner frame fitting into said outer frame and having a blanket extending across it and making air-tight connection therewith, a rod running along the outer frame, a plurality of fingers i operative upon said inner frame and rigidly set upon said rod for forcing said inner frame toward the glass, a handle for rotating said rod, and means for sired position.

7. ln a blue-printing apparatus'the combination of a glass pane, an outer frame adapted to support said pane, an. inner frame setting said rod in deadapted to lie back of'said pane, a diaphragm extending across said inner frame, a rod rotatably mounted in' one-of said frames, a plurality of fingers securedto said rod and adapt- IOO ed to engage the other of said frames for forc- I IIO .ed to engage the other of said frames for forclng the inner frame toward said pane; a handle for rotating said rodi and a ratchet device for releasably retaining said rod in set p0sition.

9. In a blue-printing apparatus the combination ofla glass pane, an outer frame adaptane, an inner frame adapted to lie back o' said pane within said outer frame, a diaphragm'secured to and extending across said inner frame, a rod rota-4 tably mounted across said outer frame, a plurality of members fastened to said rod for engaging said inner frame to force it toward the pane, a handle for rotating said rod and a ratchet device 'lor releasablyretaining said rod in set position.

i0. ln blue-printing apparatus the combination of a glass pane, an outer traine adaptouter frame, a diaphragm secured to and eX- tending across said lnner frame, springs on the back of said inner frame, a rod rotatably mounted in said outer frame, a plurality of members fastened to said rod and adapted to abut said springs for forcingthem and the inner frame toward the pane7 vand means for operating said rod. l

l1. Blue printing' ap aratus comprising two intertting frames, t e inside frame having a diaphragm and the outside frame having a ledge acting as a stop against which the inside frame may lie; a rod running lengthwise of the outside frame, and rotatable about its own axis; and a plurality of fingers secured to said rod for acting upon the inside frame to force it toward the ledge on the outside frame, said rod being let into said frame for non-interference with the inner frame-when the latter is being withdrawn from the outer frame, and said outer frame being chambered for receiving said fingers when rotated to inactive position.

In witness whereof I have hereunto subscribed my name in the presence of two witnes'ses.

WILLIAM L. BIERBRAUER. Witnesses:

' RUDOLPH C. BRANDT,

LEO KLOPMAN;

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