US2197067A - Stencil device - Google Patents

Description

p 1940- A. BUSCHOW 2,197,067

' 'STENCIL DEVICE Filed Jan. 6. 1939 INVENT OR.

yd /f JuSCAol/ Patented 16, 19410 I UNITED STATE "PATENT OFFICE p "'s'rENon. Device. Adolph Buschow; New York, N. Y.

Application January 6,- 1939, Serial No. 249,553

2 Claims.

a device of the kind indicated, an improved,

adjustable, pressure-distributing diaphragm parf ticularly designed and adapted to achieve an even distribution of ink in the normal functioning of the device. r

It is also an object of the invention to provide a stencil device of generally improved construction, whereby the device will be simple, durable and inexpensive in construction, as well as convenient, practical, serviceable and efiicient in its use. s I

which will appear as the description proceeds, the invention resides in the combination and arrangement of parts, and in the details of construction hereinafter describedand claimed, and will be best understood by reference to the drawing wherein: 2

: Figure 1 is a perspective view of an embodiment ofthe'invention, the cover being removed for the purpose of clearer illustration, 3

Fig. 2'is'a'1ongitudinal sectional view, taken on the line and as viewed in the direction of, the

arrows 2-2 of Figure 1; and Fig, 3 is a transverse sectional view, taken on the line and as viewed in the direction of the arrows 3-3 of Figure 1.

For the purpose of illustrating the invention, I have shown one form thereof which is at present preferred by me since the same has been found in practice to give satisfactory and reliable results, but his to be understood that the various instrumentalities composing the invention can be variously arranged and organized,

and that the invention is not limited to the precise arrangement and organization of the instrumentalities as herein shown and described.

Referring now to the drawing wherein similar characters of reference indicate corresponding parts in the several views of. the preferred form of the invention, the numeral l2 designates a metal casing formed principally of .a plate or sheet of suitable metal such as brass, aluminum, rustless iron or the like, and bent to provide an arcuate bottom l3 having uniformly distributed perforations (not shown) and integral side walls With the foregoing and other objects in view,

l4, l5. To theouter edge of the said bent sheet,

arcuately; stamped plates orsheets of metal similarito that of the bottom member 13 and forming the endwalls l6, ll of the casing l2, are suitably. welded or secured.

To the end walls l6, I'l angle brackets l8, l9 respectively are welded or otherwise suitably secured, Adjusting screws 2 l, 22 are threadedly enaged in the brackets l8, l9 and have the ends of their threaded stems similarly engaged in pressure shoes or members 23, 24 whose arcuate lower edges are fastened to the upper surface of an arcuately' formed metal sheet 25 lying in substantialparallelism and in spaced relation to the bottom l3, and which serves, in coaction with other elements, as an adjustable diaphragm to control the application of ink through the periorations of the bottom I3, as hereinafter described.

The straight ends of the curved sheet, which ispreferably formed of metal similar to that of the bottom member l3 and normally corrosionproof to the printing. liquids customarily em:

ployed, are attached by rivets 26 and metal strips 21, 2 8 to the inner endsof comparativelyv narrow strips of flexible material 29, 3| preferably neoprene, an artificial rubber composition having characteristics rendering it impervious to the ordinarily deleterious action of the greasy inks frequently employed in mimeographing. The outer and opposite end'of each strip of neoprene is in turn fastened to an adjacent inner portion of oneof the side walls l4, l5 by narrow metal strips 32,33 and rivets 26.

- The curved ends of the sheet25, in a manner similar to that describe'din the preceding paragraph, are fastened to substantially curved or arcuate strips of neoprene 34, 35 by arcuate metal strips 36, 31 and coacting rivets 26, the outer edgesof the last-mentioned strips of neoprene being secured to the end walls I6, I! by the inturned edges of the straight strips 32, 33 as at 38, and by arcuate metal strips '39 and coacting rivets. All of the strips referred to above are preferably of metal having the same character istics as'the bottom member l3 and the diaphragm 25.

It is to be understood that the securing of the neoprene to the metal sheet 25 in the manner indicated, provides an improved diaphragm form,- ing one of the-principal features of the invention and assures a liquid-tight seal in the space or reservoir 4| between the inclosing walls and bottom of the casing ll and the said diaphragm.

,The reservoir M in which the supply of ink sides-of the Walls Hi, I5 and serve, in conjunction with clips (not shown) to retain the stencil (not shown) operatively againstthe exterior of the bottom member I3.

In operation, the stencil assembly, generally-1' consisting of a sheet of cloth and a prepared impression sheet, is engaged against the outer surface of the arcuate bottom 13 andsecured at its ends to the flanges at, 4'! on the side walls l4, It? by clips (not shown). A supply of ink is placed in the reservoir 4| preferably in quantity sufiicient to fill the space between and to contact the opposing surfaces of'the bottom 13 and the diaphragm sheet 25,and*the adjusting screws 2|, 22 turned sufficiently to'slightly depress the diaphragm formed by the sheet 25 and the attached neoprene strips. The screw cap 45 is next tightly; replaced on the filler pipe 42 and the adjusting screws 2|, 22 turned in the reverse direction to permit the diaphragm mentioned above to rise to the normal position shown in Figures 2 and 3, thereby creating a partial vacuum in the reservoir which is essential to preventing an excessive seeping of ink through the perforations of the bottom member l3 before actual operation. Mimeograph copies may nowbe produced by rocking the device over the material engaged by same to effect the force feeding of the ink through the perforations of the bottom l3 and thence through the stencil assembly, in the known manner. As the supply of ink becomes depleted, the adjusting screws 2|, 22 are turned from time to time in order to maintain the diaphragm in normal contact with the supply of ink in the reservoir or fountain 4|,

My improved multigraphing device, it maybe pointed out, particularly lends itself to quantity production by reason of the comparatively few parts entering into its construction, and the manufacture of the -majority of these by die stamping processes.

It is to be understood that the invention may be embodied in other specific forms without de parting'from the spirit or essential attributes v thereof, and it is therefore desired thatthe pres-' ent embodiment be considered in all respects as illustrative and not restrictive, reference'being had to the appended claims rather than to the foregoing description to indicate the scope "of the invention; and it will be further understood,

that each and every novel feature and combination present in or'possessed by the mechanism part ,ofkthe invenherewith disclosed, forms a tionincludedpin this application.

What I claim as new and desire to secure by Letters Patent is: r l

1. In a stencil device of the character described, the combination of a casing, a perforated plateserving as the bottom of said casing and having integral upwardly-extendingwalls providing-opposingrsides for the casing; a pair of arcuately fashioned plates secured to the first-mentioned plate and providing end Walls for the casing, ametallic diaphragm yieldingly mounted within the casing, said diaphragmbeing fastened to longitudinallyv extending flexible strips, means'for fastening the strips to the cas-. ing, a reservoir inclosed between the diaphragm;

and the adjacent peripheries of the first and second mentioned plates, and manually operable means adjustably connected to the .end Walls and to the diaphragm for adjusting said -dia-' phragm in a plurality of predetermined positions.

2. In a stencil device of the character described, the combination :of a metallic casing,.

said casing having a perforated ar'cuate bottom,-

a diaphragm yieldingly supported in parallel relation to and within the casing,'said diaphragm consisting of a metallic plate and flexible means movably connecting the plate to-opposite'sides of the casing, a reservoir inclosed betweenthe. I

diaphragm and the adjacent innerperipheryof the casing, means fastened to the plate and communicating with the reservoir for supplying said; reservoir with ink, pressure-applying and relieving means fastened to opposite portions of the diaphragm, and manually operable, threaded A ADOLPH vieuscnow.

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