US1858423A - Photographic apparatus - Google Patents

Description

y 1932- E. WEISKER 1,858,423

PHOTOGRAPHIC APPARATUS Filed April 10, 1931 Patented May 17, 1932 UNITED STATES PATENT OFFICE Application fled April 10,

The invention relates to photo phic aparatus, more articularly as uti ized in enargement wor and. also of the type employed in so-called photostatic work where a reproduction of copy is made directly 3)011 a sensitized paper or other more or less exible material or film. It has been the general practice in the making of enlargements and hotostats to first properly focus the camera i y viewing the ima on a ground glass or like surface and t en replace the gropnd glass by a box or frame carrying sensitized I material disposed in the foca plane of said lass. g It is the object of the present invention to combine the focussing and sensitized material retaining elements, making thereby unnry the insertion and removal of a ground glass or like member as well as a m swi or moving of the sensitized material c into lplace, or the use of a plate holder or the li e therefor.

A further object of the invention resides in the provision of a combined focussmg screen and retainin member which embodies a pluralit of fix separated focussmg ele-- ments an intermediate vacuum-providing means which are adapted to retain the sensitized material temporarily to the focussing screen.

A still further object of the invention resides in the rovision of means wherzzly the vacuum hol 'ng means may be locali substantiall to the particular area co nda in .to t e size of sensitized material to be A still further object of the invention resides in a novel construction of the surface of the retainin elements and whereby a n more eflicient grip is attained upon the material held.

In ca g out the invention, a plurality of focussmg elements, such as glass panels und on one face, are fixedly secured in a rame adjacently one another but spaced to afiord openings for the introduction of vacuum-providing means. These vacuum-providing'means may be fixedly located between the ground glass panels, or they may be arpa ranged to move over the unground surface of the panels and be adapted for insertion as required into the spaces between panels to afiord a vacuum substantially in the focal plane of the'ground glass sur aces.

In the former embodiment, as well as in the latter, provision may be made for cutting oil the vacuum to a desired suction-afi'ording member.

The active holding surface of a vacuumproviding member may, furthermore, be lonitudinai y grooved at intervals, the grooves wing in communication with the vacuum orifice. This arrangement provides for a better retaining action.

The present invention is a continuation in part of my rior application, Serial No. 224,289, filed tober 6,1927.

In the accompanying drawingswhieh illustrate the invention, .Fig. 1 illustrates, in perspective, the front of the novel combined ocussing and retaining member and shows also a sheet of sensitized material in position thereon.

Fig. 2 is a fragmentary rear view thereof.

Fig. 3 is a fragmentary transverse section, on an enlarged scale, and taken on the line 3-3, Fig. 2 of the drawings.

Fig. 4 is a fragmentary transverse section and illustrates a modification.

Fig. 5 is a perspective fragmentary view of a rtion of the retaining and vacuumprovi mg member.

Fig. 6 is a rear elevation illustrating a modification in the combined focussing screen and retaining member.

Fig. 7 is a fragmentary transverse section thereof on an enlarged scale taken on the line 7-7, Fig. 6 of the drawings.

Fig. 8 is an enlarged fragmenta horizontal section, partly in elevation, i ustratin the manner of inserting the vacuum;provi ing means in its operative position with react to the focussing elements.

ferring to the drawings, 10 designates a frame or rectangular structure which may be supported in any suitable manner for use with an enlarging or photostatic camera (not shown). Within the said frame is fixed, either horizontally as indicated in Figs. 1 and 2, or vertically as indicated in Fig. -6, a 1

plurality of adjacently disposed spaces in which are located tubes 12 havin suction openings 13 substantially flush wit the ground surface of the panels. In the embodiments indicated in F1 1 to 4, these tubes are in fixed relationship with respect to they panels 11 and are further in communication with a header or like member 14 adapted for connection, as through the hos- 15, with suitable vacuum roducing means (not shown). By this expe 'ent, suction is provided in the various tubes 13 over the face of the focussin member comprising a lurality ofvad'acent y disposed panels 11.

f it be d tolocalize the holding action to the particular area of the surfaces required for retaining a piece of sensitized material 16, as of comparatively small size relatively .to the apparatus, provision may be made for cutting off certain of the tubes 13 which are not required. For example, referring to Fig. 4 of the drawings, the outlet from a header 14 may be provided with a valve 21 operable by turning the head 22 of the stem 23 thereof, which stem is threaded into the outer wall of theheader, as indicated. Thus, not only may the suction be regulated to the particular degree but the same may be entirely out off from those sections of the panels which are not employed for holding of the sensitized material 16.

It is not necessary, however, that these vacuum affording means be maintained in fixed relationship to the anels, and in Fig. 6 an arran ent is disc osed whereby a plurality 0 tubes 25 are movably mounted over the back of the ground glass anels 26 which are provided with interme iate spaces 27 For example, the tubes may be slidazlig mounted upon a pair of upper and lower r 28 and are individually connected through hoses 29 and 30 to different sets of sources of vacuum 31 and 32. By grouping the vacuum supplies in this manner, a more uniform vacuum is attainable at the ground glass surface of the panels; and valves 33 and 34 may be provided in the respective hose connec tions to limit the vacuum to the particular sections of the panels desired for holding. It is to be understood that the tubular members 25 are similarly provided with longitudinally disposed perforations 35 and that the tubes are arranged to be inserted in the spaces 27 with their openings 35 brought substantially flush with the ground glam surface of the anels.

Y may be accomplished readily by slidably mounting the tubes on rods 36 extending toward the panels from the blocks 87 slidable on the rods 28. In Fig. 8, the full-hue position indicates atube m position for retaining a strip of, sensitized materialto the panels and the showing in dotted lines indicates its position when retracted to permit of movement over the back of the panels.

The holding surface of the aforesaid tubular retaining members ma be constructed to afford a more uniform an satisfactory holding if the same be gouged out or ved longitudinally to provide a succession of adjacent grooves 40, Fig. 5, with intermediate smoot portions 41 representing the normal outer surface and designed to lie substantially flush with the ground lass surface of the panels. The grooves 40, rthermore, are arranged to be in communication with a perforation 42 from the interior of the tube and will thus distribute the suction along the series of grooves for 'the particular group, end transverse grooves 43 being also arranged to allow for intercommunication, as wel as a transverse groove 44 at the perforation 42. The latter transverse groove, however, does not extend to the final side grooves of a group as it would tend otherwise to reduce thereby the effective vacuum.

I claim:

1. A combined focussing screen and retaining member for sensitized material, comprising a series of fixed, separated translucent sections, and means to apply suction to one surface of the sections through the interveninfi spaces.

2. combined focussing screen and retaining member for sensitized material, comprising a series of fixed, separated translucent sections, and intermediate vacuum-providing means operating substantially in the focal plane of said sections.

3. A combined focussing screen and retaining member for sensitized material, comprising a series of fixed, separated translucent sections, and intermediate movable vacuumproviding means operating substantially in the focal plane of said sections.

4. A combined focussin screen and retaining member for sensitize material, comprising a plurality of ground glass panels separated from one another, and vacuumroviding means located in the interm late spaces.

5. A combined focussin screen and retaining member for sensiti material, comprising a series of fixed, separated translucent sections, intermediate vacuum-providin means operating substantially in the foca plane of said sections, and means to control the suction in said vacuum-provid' means.

6. A combined focussing screen an retaining member for sensitized material, comprising a frame, a plurality of ground glass panels fixedly mounted therein and separated from one another, and vacuum-providing 5 means movable over the back of the frame and adapted to be inserted in the said spaces between panels.

7 A combined focussing screen and retaining member for sensitized material, comprising a frame, a plurality of ground glass panels fixedly mounted therein and separated from one another, and vacuum-providing means movable over the back of the frame and including a tube slidable along the back of the frame and slidable also in a direction at right angles to its sliding motion on the frame, said tube being longitudinally perforated at its forward face and adapted to fit in the spaces between the glass panels with perforations ubstantially flush with the ground surface thereof.

8. A combined focussing screen and re taining member for sensitized material, comprising a series of fixed, separated translucent sections, and intermediate vacuunrproviding means including a tubular member perforated longitudinally and having a succession of surface grooves about a perforation and communicating therewith.

9. A combined focussing screen and retaining member for sensitized material, comprising a series of fixed, separated translucent sections, and intermediate vacuum-providing means including a tubular member perforated I 35 longitudinally and having a succession of longitudinal surface grooves about a perforation and communicating.therewith, and intermediate flat surfaces.

10. A combined focussing screen and re- 40 taining member for sensitized material, comprising a series of fixed, separated translucent sections, and intermediate vacuum-providing means including a tubular member perforated longitudinally and having a succession of 45 longitudinal surface grooves about a perforation and transverse surface grooves communir \ting with the longitudinal grooves.

In testimony whereof I afiix m signature.

ELLIS ISKER.

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