US2140483A - Stencil - Google Patents

Description

Dec. 1.3, 1938. A E 'SCHUTTE 2,140,483

STENCIL Filed Dec. 13, 1955 Mn.. 1.". n...

INVENTOR 4061/575 'c'f/z/rrf BY R LL) e bwk Aa. ,21,

ATTORNEY Patented Dec. 13, 1.938 i y l -,UN'1TED sTATEsPATENT oFFlcI-z STENCIL August E. Schutte, Northboro, Mass., assigner to A. B. Dick Company, Chicago, Ill., a corporation of Illinois Application December 13, .1935, serial No. 54,242 s claims. (o1. 10i-121) This invention relates tothe art of duplicating, 1 `of the type, offset from the plane of the illm and provides an improved stencil. l 4 and a plurality of minute perfrations 9 are In the past, stencils have commonly been made formed in that offset area by the projecting granthrough perforating or cutting holesin a sheet ules l0 of sand. I The face of the resultant stencil 5 which had been treated so that it was generally has local embossed areas Il, which correspond impervious to ink, or by expressing parts of a to the indentations 8 caused by the type 1, and fluent ink-impervious coating or impregnating which have a plurality of minute perforations 9 composition which had been applied to an open, through which ink may pass. The stencil thus lace-like tissue. A particular object of my inmade may be placed in a duplicating machine in 10 vention is the production of a stencil, made the ordinary manner, with the indented side next 10 through periorating` an ink-impervious film, to the ink pad, and, when copy paper is placed which is cheap and durable and not affected by upon the stencil, ink can be forced into the inclimatic conditions. dentations 8 and through Ithe perforations 9 to the I have discovered that such a stencil may be copy paper. made from a sheet of cellulosic material of the Through the use of abacking having iine, close- 15 type commonly known as Cellophane Such 1y spaced projections I0 on its surface, the dots a sheet is av tough, ilexible, homogeneous, semiof ink which pass through adjacent perforations plastic, non-brous film which is impervious to, 9 may meet to form a continuous outline for the and not injuriously affected by, the inks commoncharacter written but ,the centers of the loop ly used in duplicating. In accordance with my letters will not be cut out and, as a result of the 20 invention, local areasof such a sheet are forced, fact that only those portions 'of the lm 4 which as by the blow of the type of a typewriter, against are struck bythe type l are oiset from the plane` a surface having closely spaced, hard, fine proof the lm, only the offset or embossed portions jections. That portionV of the lm which is struck I I of the film 4 will be forced against the backing by a type is indented over an area corresponding v5 with sufficient'force for the granules of sand 25 to the face of the type, and is offset from the I0 to perforate the film 4, so that the outlines of .l plane of the film. The projections from thew surthe characters formed on the prints made through 0 face against which the iilm is struck'provide that such a stencil will be clearer and sharper than oiset portion with a plurality of minute perforawould otherwise be the case. 00 tions throughwhich ink may pass. D What is claimed is: 30

A specific embodiment of my invention is il` 1. A stencil, comprising a generally ink-imlustrated in the accompanying'drawing, in which: pervious, homogeneous, semi-plastic, non-fibrous, g Fig. 1 is a plan View of a stencil made in accellulosic sheet containing local areas correspondcordance with my invention, broken away in part. 'ing respectively to the various characters formed to show the sandpaper backing; by 'a typewriter or the like and each having a 35 Fig. 2 is an enlarged section illustrating the plurality of minute perforations through which formation of a character in the4 stencil-sheet ink may pass.

when it is struck by the face of the type; and 2. A stencil, comprising a generally ink-im- Fig. 3 is an enlarged view of a character formed pervious, homogeneous, Y semi-plastic, iiexible, 40 yin the stencil-sheet as illustrated in Fig. 2. non-fibrous, cellulosic sheet containing local o A convenient method of making a stencil em-l areas indented to form oiset portions having a, bodying myiinvention consists in placing a sheet plurality of minute perforations through which 4 of non-bousellulosic plastic-of thetype com- ,ink may pass.

monly mar`etedr-under the name Cellophane 3. A stencil, comprising a generally ink-imover a sheet of fine sandpaper 5 and typing on it pervious, homogeneous, semi-plastic, ilexible, 45 in a typewriter against the sandpaper 5. non-iibrous,.cellulosic sheet containing local em- Each portion of the sheet 4 which is struck 'bossed areas havingaplurality of minute perforaby a type-face l is indented to form a local tions through whichinkmay pass.' portion 8. which corresponds in area to the face AUGUST E. SCHU'I'IE.v

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