US1426117A - Julian h - Google Patents

Description

J. H. SMITH.

PHOTOGRAPHIC PRINTING MACHINE.

APP LlCATION FILED 050.13. 1920.

. 4 17 Patented Aug. 15, 1922;

Z5 FI Z Y Z0 W/ bcxoy Q/i/a V .5/27/% BY 1 11%.. 15 M d ATTORNEY i To all whom 't'may concern? useful UNITED STATES P ATENT OFFICE.

JULIAN E. SMITH, 0F SEATTLE, WASHINGTON, ASSIGNOR T0 SPECIALTY MANUFAC- TUBING COMPANY, OF SEATTLE, .WASI-IINGTON', A CORPORATION OF WASHINGTON.

.. rHoroGRArHIo-rnmrme MACHINE.

Be it known that I, JULrAN H. SMITH, a

citizen oftthe United States, residing at Seattle, in the county of King and State of W'ashin'gton, have invented certain new and Improvements in Photographic- Printin'g Machines, of which the following is a specification. i 1 z This. invention .relatestd photographic printing apparatus; and its object is the perfecting of "apparatus of this character whereby the operation of printing "is" facili= tated and the'quality of the work improved.

The invention relates more particularly to the platen, the platen carrier, the peculiar manner of connecting theIthem to each other, and to connections between said carrier and the machine frame:

The invention further consists in certain details of construction, arrangement and 1 combinations thereof as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is aside elevational view of the machine platen and thecarrier therefor, shown applied to the upper portionof the cabinet of a printing machine, which is shown in longitudinal vertical section." Fig '2 is a plan view of'Fig. Fig.i 3* is a front elevation of the same. Fig. 4 is a detail sectional view through 4-4 of Fig.2.

In said drawings,the numeral 5 represents the box member of a cabinet having a top or table element 6. This table is provided with an opening 7 having a glass plate 8 therein whose upper surface is in a plane with the upper surface of the table.

9 represents a block, preferably of metal, having secured to its underside one or more plys, 10, of rubber, felt, or other suitable resilient material and constituting with the said block the platen of the machine.

Protruding from opposite sides of the platen block element 9'and in axial alignment with each other are studs 11 which ex tend into apertures, such as 12, provided in the side bar elements 13 of a substantially rectangular frame or platen carrier, hereinafter designated as the presser.

The apertures 12 are of greater depths than the diameters of the respective studs to I afford relative vertical movements between Specification of Letters Patent; Patcrgted [Riga 15, 1922, I App lieation filed nece mber 13, 1920. Serial No. 420,134..

Each of the presser side bars 18 is provided integrally with a bracket element 14 extending over theadjacent side of the platen.

Each of the elements 14 have a screw threaded hole 15 (F 4) for a screw 16 which affords an adjustable stop to limit the elevation of the platen with respect to the presser. c

Between the presser bracket 14 and the platen are"helical compression springs 17 which serve to yieldingly retain the platen at its lowermost position with respect to the presser as governed by the movement of the studs 11 within the apertures 12.'

The rear bar element 18 of the presser is desirably in the nature of arod which at its ends is ournaled in bifurcated posts 19 pro-' attachment 21 by means of a spring-'22 which tends to yieldingly retain the presser and the positions. v I Thepress'er from bar element 23 is formed at its; rear side with a finger engaging portion 24 andat its front is provided spaced aperturedlugs 25 throughwhich a rod'26 extends transversely. Fulcrumed upon the rod 26 is a lever having an upwardly extendingarm 27 which is surmounted by a hand support 28. The other arm 29 of said lever extends downwardly in the form of a hook having an inner cam surface 30 inclined as shown in Fig. 1 to be engageable with the underside of a roller 31 provided in astand 32 securedto the table 6.

Coiled about the rod 26 are elements 33 of a spring having a central portion 84 engaging in the lever arm 27 and with its extremities engaging against the front element 23 of the presser. This spring acts to yieldingly retain the lever arm 29 in its most forward position so as to be free from the roller 31*when the presser is being brought down into printing position.

The operation of the invention may be explained as follows:

Assuming a negative is placed upon the glass plate 8 and a sensitized piece of paper platen in their rearmost elevated is placed upon a support therefor, not shown, provided at the underside of the platen, the paper is by means of the presser brought into printing position against the negative.

The printing is accomplished by means of light rays passing through the negative from an electric lamp located within the box member.

In carrying the paper into the printing position above referred to the presser is swung in opposition to the power of spring 22 by the operator manipulating the presser with his fingers engaging in the presser part 24L while the palm of the hand rests upon the support 28 of the cam lever 2729 as indicated in Fig. 1.

hen the downward movement of the platen is arrested by the table 6 or glass 8 the operator, with his hand acting through the medium of the support 28, actuates said lever to cause the cam arm 29 thereof to engage under the roller 31 whereby the presser is forced down to make the platen bear firmly against. the work.

By thus affording presser locking and cramping means actuated by the same hand which swings the presser forwardly and downwardly about its pivotal connection with the posts, the feeding operation of a photographic printing machine is rendered more rapid and a better quality of work insured.

The carrying of the platen into and cramping the same in operative position is, moreover, performed in substantially a con tinuous movement of the operators hand and arm. Torelease the presser so that the spring 22 may restore the platen into a position to receive a new piece of sensitized paper, it is essential only that the operator pushes against the lever part 28 while retaining hold of the part 24 with his fingers.

The hand not occupied with operating the presser and parts associated therewith as above explained is employed in replacing upon the laten sensitized papers between the successive printing operations.

The function of the springs 17 is to cooperate with the yielding of the material in the platen parts 10 to accommodate relative movements between the platen and presser when the latter. is urged downwardly through the agency of the cam device 30 subsequent to the seating of the platen.

In practice, the screws 16 are regulated so that the ends thereof will serve as stops to limit the movement of the platen block 9 with respect to the presser, whereby the resilient platen parts 10 are compelled to with stand the final pressure.

What I claim, is,

.In a photographic printing machine, a cabinet, a platen provided with axially aligned studs projecting laterally therefrom, a presser comprising a rectangular frame enclosing said platen, the side members of said frame being provided with slots to receive the platen studs, said frame members being also provided with apertured bracket elements extending over the platen, screws adjustably engageable in said apertures and extending into proximity of the platen, springs lnterposed between the respective bracket elements and the platen, a catch provided on the cabinet, and means carried by the presser and engageable with said catch for releasably securing the platen under pressure upon the cabinet.

Signed at Seattle, Washington, this 1st day of December, 1920.

JULIAN H. SMITH.

\Vitnesses:

PIERRE BARNES, MARGARET Gr. SUPPLE.

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