US1702232A - Vacuum-pressure printing frame - Google Patents

Description

A'. T. KoPPE VACUUM PRESSURE PRINTING FRAME 2 SheetsShet l yFiled `May 17, 1923 INVENTOR. if? /exna/er /p/ve A TTORNE Y.

Feb. 12, 1929. 1,702,232

A. T. KOPPE VACUUM PRESSURE PRINTING FRAME Filed May 17, 1925 2 Sheets-Sheet 2 I N VEN TOR.

; l l f' ATTORNEY.

Patented Feb. 12, 1929.

UNITED STATES PATENT OFFICE.

.ALEXANDER T. KOPPE, OF CHICAGO, ILLINOIS, ASSIGNOR TO DIRECTOPLATE COE- PORATION, 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

VACUUM-PRESSURE PRINTING IFRAME.

lApplication led May 17, 1923. Serial No. 639,669.

The invention relates to vacuum pressure frames, and has for its object to provide a device of this character wherein a negative is received and held on a sealing strip by springs carried a cover plate, and the cover plate cooperating with a ange of the sealing strip for forming an airtight chamber around the negative, from which chamber and the chamber' formed by the negative and the plate, air may be sucked for creating a vacuum between the negative and the cover plate, thereby insuring .a close engagement of the press plate with the negative. The air is sucked from between the negative and the press plate during the vacuum forming operation, thereby causing the negative and press plate to be forced together by atmospheric pressure and insuring the holding of the press plate in adjusted position on the negative during the photographic reproduction of the image :trom the negative on the press plate.

A further object is to provide a vacuum pressure frame wherein a negative is held yieldably in engagement with a sealing strip, while a press plate is disposed on the negative within a chamber, in which chamber a vacuum is created and the air withdrawnv :trom between the press 'plate and the negative and from the chamber, thereby causing 'the press plate and negative to be pressed into close contact and to be held securely in the exact positions they have been placed in, in relation to each other.

A further object is to form the cover plate springs suiciently strong whereby they will not be iexed when the vacuum is formed within the. chamber of the frame, and consequently will maintain the negative in close airtight engagement with the sealing strip.

A further object is to provide a yieldable hinged connection between the hinged end ot the cover plate and the base plate, thereby allowing the cover plate to be adjusted or assume a position relative to the plane of the glass negative, or incident to the variation and thickness oit the glass. Also to provide an adjustable clamping and holding means carried by the base and cooperating with the free end of the cover plate for holding and clamping the cover plate in closed position.

A further object is to provide the cover plate with a nipple having a passage in communication with the chamber extending around the sides of the negative, to which nipple a hose may be attached leading to a pump for forming a vacuum within the frame.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawings, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed Without departing from the spirit of the invention. f

In the drawings Figure l is a top plan view of the frame.

Figure 2 is a transverse sectional view through the frame taken on line 2 2 of Figure l.

Figure 3 is a side elevation of the frame..

Figure 4 is a bottom plan view of one side of the frame.

Figure 5 is a side elevation o the hinged end of the frame.

Figure Gis a detail view showing the cover plate holding member.

Figure 7 is a detail view showing a side elevation of one of the negative engaging springs.

Referring to the drawing, the numeral l designates the base plate of the frame, which base plate is preferably rectangular shaped as shown, and is supported by brackets 2, which may be secured-to a vertical or horizontal support, for supporting the vacuum frame, either in a horizontal or vertical position. The rectangular shaped frame l is provided with an inwardly extending relatively wide flange 3, to which flange is secured a sealing strip 4, by means of anglebars 5, through which screws 6 extend into the flange 3. The sealing strip 4 is provided with a flange 7, which extends beyond the outer edge 8 of' the frame l, and with a iiange 9 at its inner edge, which is not as high as the ange 7. However the flanges 7 and 9 are spaced from each other, thereby forming, when the coverplate.

10 is closed, a rectangular shaped chamber l1L extending entirely around the frame. When'n it is desired to make a press plate impression, the negative 12 is placed in the frame with its sides resting on the inner flanges 9 of the sealing strip, which strip is preferably formed from rubber. After the negative l2 has been placed in position, the press lplate 13 is .properly positioned on the ne tive, and then the cover vplate is closed. Vhen the cover 'plate 10 is closed the outer sides thereof engage the sealing strip flanges 7, and the, oppositelyl disposed bowed leaf springs 14,

. which are secured at at one of their ends to the inner side of the cover, (see Figure 7) engage the opposite vsides of the negative 12 in registration with the flange 9 of the sealing strip 4 and form an air-tight binding connection between the negative `and sealing strip.v S rings 14 are sufficiently strong to preventeakage between the negative and flange 9 when air is sucked from the rectan u- Q10, the

- l leaI lar shaped chamber 11 and from the cham er 16 formed by the negative 12 and the cover mrpose of which-will presently appear. over plate 10 is provided with a the passage 18 of which is in registration with the chamber 11, air may be sucked for creat- -ing a vacuum within the chambers 11 and 16. When a vacuum is created in said chambers the air is withdrawn from the region between lthe negative 12 and the press plate 13 and from the region between the pressplate 13 and the cover plate 10 so that' the flangesv 7 and 9 are compressed by the outside atmospheric pressure, thus causing the cover plate to move inwardly and press theA press plate 13 against the negative 12 to produce a close .contact of the negative and press vplate and \tohold the press plate securely in position on" the negative. By providing vacuum means, the necessity of using or providing mechanical means for holding the press plate and negative in contact is obviated, and consequently the breaking of the negative incident to undue pressure is also eliminated.

One endof the cover plate 10 is hingedly l connected at 19 to shafts 20, which shafts are slidablymounted in bearings 21 of bosses 22 carried by the adjacent end of the base 1', and

consequently allows a movement of the cover plate 10 in relation to the base 1 when the cover plate is closed. Secured to the ends of the slidable shafts 20 are collars 23, and inuterposed between said collars Iand the bosses 22 are coiled springs 24, which coiled springs l`exert an inward pull on the hinged end of the cover plate 10, thereby insuring a close and binding engagement of the cover plate with `the flange 7 of the sealing strip, consey quentlyfinsuring an airtight engagement between' the cover plate and the flange 7 when thecoverplate isf'closed: The yieldable sup l porting of the shafts 2O also allow the cover plate to conform to any4 irregularities which may exist in the flanges 7 of the sealing strip or in the innerl surface of the cover plate. After the press plate is properly ositioned, the cover plate 10-is closed, an the hooks 25 arevhooked over the U-shaped member 26 vcarried by the free end of the GOVQI nipple 17, to which may be attached a hose. ng to a pump, and through which nipple y plate. Hooks 25 are pivotall connected at 27 to a handle member 28, whc handle member nhas its end pivoted at 29 to a'block 30, adjustably mounted on a bolt 31 carried by the base 1. The pivotal oint 29 is intermediate the pivotal points 2 and the base plate 1, and consequently it will be seen that when the handle member is moved to the position shown in Figurel'3, the free end of the cover plate 10 will befforced into close and binding engagement with the flanges of the sealing strip 4. By adjusting the nuts 32, on the i lbolt 31, it will be seen that the clamping action maybe Varied for insuring an airtight joint betweenthe cover plate and the scalingl strip, orto adjust the device according to the thickness of the negative 12.l Springs 24 au-- tomatically allow the hinged endof the cover plate to adjust itself to the thickness of the ne ativc 12, or to irregularities in the sealing str1p or cover plate.

After the press plate has been positioned anda vacuum created for expelling air from the chambers of the frame and from between the press plate and negative, the image on the negati-ve may' be reproduced photographicallyin the usual mannerby a light disposed to the negative side of the frame.

From the above it will be seen that a vacuum pressure frame is provided, wherein the negative is resiliently held in an airtight condition without use of mechanical means for holding the same, as is now the practice, and one wherein the presspla-te is held on the negative without use of mechanical means by expelling air from between the press plate and the negative for securely holding the press plate in the exact position on .the negative.

The invention having been set forth what is claimed as new and useful is 1. A vacuum pressure frame compr1s1ng a base plate, spaced yieldable seahng flanges carried by said base plate, a cover plate hingedly connected to the base plate, the outer sealing flanges engaging the cover plate, the inner sealing flanges being adapted to engage one side of a negative, yieldable members carried by the cover plate and adapted to en gage the other side of the negative and hold the same in engagement with the inner seal-v v ing flanges, said cover and negative forming incassa means for exhau air` from betweensaid plates, said yieldab e members being sailiciently strong to prevent unseating of :the negatives during the air exhausting operation.

3. A vacuum pressure frame comprisinga base plate, a cover plate hingedly and yieldably -connectednto the base plate, clamping means for clamping the free end of the cover.

f the negative and means whereby air may be.

plate to the base plate, achanneled sealing member extending around the base plate thereby forming spaced anges, said cover plate having a binding' engagement with the outer seallng flange, spring means carried by the cover platefand registering with the inner flange of the channel and forming means for holding a negative in close airtight engagement with the inner flange of the seal- 'ing channel and means whereby air may be exhausted from. between the negative and cover plate and from the chamber formed by the channeled member.

4. A vacuum pressure trame ocomprising cooperating base and cover plates, space yieldable sealing flanges carried by one of saidl plates, one of said yieldable sealing flanges being adapted to support a negative and yieldable members carried by one of sai plates and cooperating with one of the yieldable sealing flanges for holding the negative.

5. A vacuum pressure frame'comprising cooperating base and cover plates, spaced resilient sealing flanges carried by the base plate, thereby formin a chamber around the the base plate when t ecover plate is closed, spring means carried by the cover plate-and registering with onev of the spaced resilient the negative `when air is exhausted from the frame. l l 8f A vacuum pressure frame comprising a base plate, a yieldably hinged cover cariied f by said base late, sealing means interposed between the ase plate and cover and with which the cover-cooperates for holdin a negative in spaced relation to the cover, 'yie dable means carried bythe cover for engaging exhausted from between the negative and the cover. l .v

9. In combination, a rectangular. frame having'an' opening to permit light Ito pass therethrough, a negative mounted over said opening, a resilient sealing member xedon said frame and'engaging one side of said negative `around said opening, a sensitized late adapted to contact with the other side o said negative, aplate adapted to engage the side of said sensitized plate opposite said negative,

means for forming an air vseal aroundv the tive, a platevadapted to engage the side of said sensitized plate opposite said negative,

a .second sealingvm'ember attached to said frame and/enga ingsaid plate arofund said sealing anges and `forming means for hold-n .negative outwar ly pf the edges of said negacooperating plates, a channeled sealing member extending around one of said plates and with whichsealing member theother plate cooperates,.and yieldable means carried'by one ofy said plates and cooperatin with the sealing means for holding a negatlve in airtight engagement with the sealing means, means for exhausting air from between the negative and plate, said yieldable means being suiciently strong to prevent unseating of tive, and means topermit the air tobe ex' hausted from the region between saidnegative and said sensitized plate.

having an opening to permit light, to pass therethrough, a negative mounted over sald glw 11. In combination, a rectangular frame opening, a sealing member carried by said frame and engaging one side of said negative aroundy said opening a sensitized plate adapted to'conta'ct with the other side of said negay tive, a plate adapted to engage the side of said sensitized plate opposite said negative, a second sealing member attached to said frame and engagingsaid plate around said negative outwardly of the edges of said n tive, means to permit the air to be exhauste from the regionV between said negative and said sensitized' plate, and means for resiliently connecting said frame and said plate.

In testimony whereof I aix -my si ature.

- ALEXANDER T. KO PE.

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