US1742372A - Photographic-printing apparatus - Google Patents

Description

Jan. 7, 1930. D. R. N. TAYLOR 1,742,372

. PHoToGRAPmc PRINTING APPARATUS Filed sept. 29, 1924 4 sheets-'sheet 1 QONALD ROBERT NAPIER TAYLOR INVNTOR:

HIS ATTORNEY.

Jan. 7 1930. D. R. N. TAYLOR' PHOTOGRAPHIG 'PRINTINGPPARATUS .Filed Sept. 29. `1924 4 Sheets-Sheet '2 DONALD ROBERT NAPIER TAYLGR INVEETOR HIS ATTORNEY.

Jan. 7, 1930. D. R. N. VTAYLOR 1,742,372

PHOTOGRAPHIC PRINTING APARATUS Filed'sept. 29. 1924` 4 sheets-sheet s mail;

Z8 35 5042 54 4a ao Y DONALD ROBERT NAPIER TAYLOR INVENTOR: BY Q HIS ATTORNEY.

Jan. 7, 1930. R. N. TAYLOR PHOTOGRAIHI G -PRINTING APPARATUS -4 Sheets-Sheet 4;

Filed sept. 29, 1924 DONALD ROBERT NAPIER TAYLO IIVENTOR HIS ATTORIIEY Patented Jan. 7, 1930 uNiTED STATES PATENT OFFICE DONALD ROBERT NAPER TAYLOR, OF LONGUEVILLE, NEAR SYDNEY,'NEW SOUTH WALES, .AUSTRALIA PHOTOGRAPHIG-IPRINTIN G APPARATUS Application filed September 29, 1924, Serial No. 740,468, and in Australia April 1, 1924.

This invention relates to photographic printing apparatus which is adapted by the aid of artificial light to enable prints to be made on sensitized surfaces which may be on glass, metal, paper, stone or other suitable material or substance.

Such apparatus comprises a cabinet wherein the printing may be effected, means for creating a vacuum whereby proper contact lo may be eected for the printing operation,

means whereby the printing components ofthe apparatus are cooled, and optionally means whereby wet negatives or prints or` plates, or thelike may be dried. lReferring to the accompanyinfr drawings, Fig. 1 is a perspective view of the printing apparatus with drying chamber associated therewith; Fig. 2 a detail sectional view of part of the printing apparatusand the drying chamber; Fig. 3 a cross section` ofthe printing apparatus withl drying chamber therewith; Fig. 4 'detail sectional view il'- lustrating the hinge connections of the printing frame and the contact `making surface; Fig. 5 detail view of locking means for the printing frame; Fig. 6 detail view of `means associated with the contact surface for ensuring maximum contact between the negative and the printing surfaces; Fig. 7 detail' view of Contact making surface; Fig. 8 detail view of air exhaustion connection; Fig. 9 detail view of suction pump means; Fig. 10 detail View on enlarged -scale illustrating connec- 4 tions for air blowing to printing frame for cooling purposes; Fig. 11 diagrammaticv sketch of connections for pump; Fig. 12 detail View of modified form of printing apparatus; Fig. 13 diagrammatic sketch of pump connections forfame shown in Fig. 12; Fig.

14 detail view of air control used in pump pipe circuit means shown in Figs. 12 and 13; and Fig. 15 diagrammatic lview illustrating electric incandescent lamp gircuit arrangements.

A cabinet 1 is provided; such cabinet is preferably constructed ofwood and is also furnished with a hinged door 2 which Ama have thereinlouvre openings 3 or the like. Within the cabinet 1 and carried on the floor 89 thereof is preferably an `electric motor 4.

v The shaft 5 of such motormay be connected by a belt 6 or the like to a pulley 7 on a shaft 8 journalled in bearings 9 situated on the floor 89 of the cabinet 1. The shaft 8 also has mounted thereon the pulley 10 whichmaybe connected by a belt 11 to a pulley 12 on the shaft of a rotary air blower 13. Another pulley 14 is also located on the shaft 8 which may be connected by a belt 90 to a rotatable wheel '15 which is adapted to reciprocate the plunger 16 of a suction pump or the like also supported on the floor 89 of the cabinet 1. In' the cabinet 1 are a series of openings 17 through which atmospheric airmay enter.

series of separated pegs 25 or like supports v against which wetprints or negatives 26 or the like mayrest when placed in the drying chamber 19 to be air dried. Such drying chamber may be furnished with a roof 27.

On the head of the cabinet 1 is disposed a printing frame which consists of two , elements 28 and 29 whichare joined to each other by hin es 30', theelement 29 being also preferably inged at 46 to the cabinet 1 to enable ready access in case of necessity to the electric incandescent lamps 51. The element 28 may be opened from the element 29; such element 28 carries a piece of rubber 30 or likeflexible material which is'connected by means of the l plate 31 to one end of the air exhaust pipel32,

whose other end may have attachedthereto' the T-piece 33 having connected thereto the pressure gauge 34 and one end ofa flexible pipe 35, whose other end is connected to a y pipe 36, extending through the front of the cabinet 1, and provided with a control cock 37. It is preferred to provide a coil spring 38 about the pipe 32 whereby the plate 31 may be held in position against the rubber 30.

The face of the rubber or the like against which the plate 31 bears is provided with va series of projections 39 and intermediate air passage grooves 40, and theplate 31 also has a series of air passage groves 41 therein. The projections 39 are preferably of pyramidic formation and the grooves are located longitudinally and transversely of each series of such projections. On the element 29 are two sheets of glass 42 and 43 which are separated fromV each other, an open space 44 being provided in the element 29 between the said glass sheets 42 and 43. Atthe edges of the rubber 30 or the like are projections 45 adapted when the element 28 is closed 011 the glass 42 to make close contact (by being spread) with-:the upper surface of such glass. lThe glass 43 does not extend completely along the element 29`; it is of such length to provide an opening 47 which is in communication with the space 44 between the pieces of glass 42 and 43 and a space 48 below the glass 43.

By providing the air passage groovesl 40 about the projections 39 air about the face of the rubber 30 or the like upon which the said projections are located may be withdrawn therefrom through the passages formedby the said grooves by the operation of the suction pump.

Within the cabinet 1 a dividing wall 49 may be provided uponwhich may be supported a series of holders 50 for electric incandescent lamps 51 whose bulbs arelocated within a chamber 52 carried in the cabinet 1. The chamber 52 has the interior of its walls provided with reflecting surfaces, and its head is furnished with a flange 53 beneath which in one wall of the chamber 52vis the series of openings 54. In another wall of the chamber 52 is a series of openings 55; the openings 54 communicate with the space 48 below the glass 43 and withV the interior of the chamber 52 andthe cabinet 1, and the openings 55 communicate with the interior of the chamber 52 and the interior of the cabinet 1. The u per face of the flange 53 may also be provlded with-a reecting surface. v

Leading from and open'to the nozzle 56 of the suction pump 'casing 57 is a pipe 58 which is also connectedto and open to the pipe 36. The plunger 16 of the suction pump is fitted with leather or like packing 59 and itis also provided with air escape. openings 60. The pump casing 57 has'openings 61 in the bottom thereof and thenn'ozzle 56 of the pump is also fitted with a non-return ball valve 62. A plunger rod 63 connects the plunger 16 to the drive Wheel 15 therefor. Upon the descent of the plunger 16 in the casing 57 air contained in 'such casing below the plunger 16 and sucked thereinto from beneath the rubber 30 or like material on the upstroke of the plunger 16 passes between the inner walls ofthe casinvr v57 and the packing 59 and is discharged. rom the casing 57 at the top thereof, which is open, after passing through the openings 60 in the plunger 16. v

An air inlet pipe 91 connects the air blower 13 to the spaces 44 and 48 respectively provided between the glass plates 42 and 43 and below the glass plate 43. 'Such air inlet pipe 91'may have separate inlets 64 and, 65 leading respectively to openings 66 and 67 in the cabinet 1 whereby air may be directed from the blower 13 through the spaces 44 and 48 thus enabling cooling of the glass plates 42 and 43 and the electric lamps 51. 'Air thus blown vinto such spaces passes beneath the flange 53 and up through the openings 54 into the chamber 52 and through the openings 55m the wall of said chamber to the interior of the cabinet 1, from whence it is free to pass upwardly into the drying chamber 19 to dry wet prints or negatives-26 or the like carried therein. The passage of such air from the air inlet pipe 91 is shown by arrows in Fig. 2.

To enable pressure to be applied to the element 28 to permit same to be closed properly over the element 29 for printing operations and to spread the projections 45 on the edges of the rubber 30 so that'this will make close contact with the glass plate 42 the elements 28 and 29 are fitted with-hinged members 68, and the element 28 is provided with striker plates 69. Pivoted to the members 68 are levers 70 with cams 71 (Fig. 5), which are adapted,'when the levers 70 are pressed over the head of theelement28, to frictionally contact with and press on the striker plates 69 and exert pressure on the element 28 and consequently also on the element 29. A counterweight 72 may be suspended from a cord 73 attached to the element-28 to limit the opening of such element in relation to the cabinet 1.

Instead of having separate inlet openings 64 and 65 for the air inlet pipe 91 only one of such openings 74 (Fig. 12) may be provided therefor communicating with an opening 75 in the cabinet 1 .leading to a space 76 below a plate of glass 7 7 carried in the printing-element 79 upon which is also the glass plate 80. A space 81 is provided between the glass plates 77 and 80. From such space -leads a pipe line 82 which is connected'with and in communication with a branch pipe '83 which latter is lconnected to and in communication with the pipe 36. A control valve 84 is located in the branch pipe 83. In the pipe line 82 is a fitting 92 provided with a spring pressed non-'return ball valve 93.

A circuit arrangement for the electric incandescent lamps 51 and motor 4 is shown diagrammatically in Fig. 15, wherein a main switch'85 is illustrated for contrlling sup ply of electric current to the motor 4 from a generator 88 and separatel switches 86 and 87 are shown for. controlling current to separate series of the lamps 5l.

In operation, sensitized objects to be printed on from negatives are placed in usual manner on the glass plate 42; the element 28 -is then secured over the element 29 and the con?4 f rial is thus drawn closely into contact with the negative and sensitized object. Whilst the motor 4 is being operated the rotary air blower 13 is also being operated and an air draught is circulated in the spaces 44 and 48 respectively above and-below the glass plates 42 and 43 and such air also passes into ,the refleeting chamber 52 and from thence to the.

interior of the cabinet 1 from whence it is free to pass to the drying chamber 19 wherein wet plates, negatives, or such like may be placed to be dried. The projections 45 on the rubber 30 or like material serve to ensure an air tight closure space between' the said rubber and the glass plate 42.

vShould the printing frame illustrated in Fig. 12 be utilized it is necessary that the control valve 84 be opened and the control valve 37 be closed before the air exhaust pump is set in operation. Upon thevopening ofthe valve 84 air is exhausted from the space 81 by the operation of the suction pump, the air passing the non-return ball valve 93 and entering the branch pipe 83 from whence it is conducted to the pipes 36 and 58` to the pump.

The apparatus as described involves features whereby good contact is made between the negatives to be printed from and the sen.- sitized surfaces to be operated on; sweating between the negatives and the sensitized surfaces is avoided owing to the cooling ef-v fect of the air blower; the cost of exposurezis lessened; the time ofexposure is regulated by the lixing of the exposure frame at a constant distance from" the light source; the printing area of the exposure frame may be increased or lessened depending onfthe number of lighting lamps which are used for exposure purposes; and either one large negative may be printed from, or a series of small ones may be printed from at one and the same time without effecting good 'contact conditions between the negatives and the Nsurfaces to be printed on. y

The bulbs of the incandescent lamps 51v may be of colored glass to enable suitable actinic light rays to .be emanated therefrom for printing purposes in 'which event the glass plates 42 and 43 or '7;7 and 80 would be constructed of clear glass, but the bulbs of the lamps 51 may be of clear glass and the said glass plates may be of suitable colored glass to enable the requisite actinic light rays to be produced. V

What I claim as my invention and desire to secure by Letters Patent is 1. In a photographic printing apparatus, a printing frame, a source of artificial light associated therewith, a glass plate for supporting a photographic negative, a second. glass plate spaced therefrom in the path of the light, and means for producing a circulation of air through the space between the .plates to cool the latter.

2. In a photographic printing apparatus,

a printing frame, a source of artificial light associated therewith, a glass plate for supporting a photographic negative, a second glass plate spaced therefrom in the path of the light, means for producing a circulation of air through `the space between the plates to cool the latter, and means for directing such air over said light source to dissipate the heat from the latter.

3. In a photographic printing apparatus,

associated therewith, a glass plate for supporting a photographic-negative, a second glass plate spaced therefrom in the path of the light, and means for exhausting the air from the space between said plates to prevent the transfer of heat from the light source to the first'named plate. \f

4. In a photographic printing apparatus, a printing frame, a source of artiiicial light associated therewith, a glass plate for supporting a photographic negative, a second glass plate spaced therefrom in the, pathof the light, means for exhausting the air from the space between said plates to prevent the transfer of heat from the light'source to the first named plate, and means for producing a circulation of air over said light source to dissipate the heat from -the latter.

5. In a photographic printing apparaus, a printin frame, a source of artificial light associate therewith, a glass plate for sup- -porting a photographic negative, a second glass plate spaced therefrom in the path of the light, and means for exhausting the air from the space between said plates to prevent the transfer of heat from the light source to the iirst named plate, said means including a conduit communicating with said space, and a non-return valve in said conduit.

In ltestimony whereof I aiiix my signature.

I DONALD ROBERT NAPIER TAYLOR.

-a printing frame, a source of artificial light iso

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