US1182420A - Method of embossing and printing sheet metal. - Google Patents

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-c. F, A. RAMBERG.. METHOD OF EMBOSSING AND PRINTING SHEET METAL.

APPLICATION FILED SEPT. 9, I915 Patented May 9,1916.

CHARLES FL a,l t ium:no;or epitome, Missoum.

icense.

Specification of Letters l ateii't.

'nnrrcon ormueoserne nun-gamma seam Marat.

Patented May 9 1916.

Application filed September 9, i915. Serial No. 49,760.

To all whomit may concern Be it' known that 1, CHARLES F. A. RAM- BERG, a citizen'o'f the United States of America, a resident of the city of St. Louis, State of Missouri, have invented certain new and useful Improvements in' Methods of Embossing and Printing Sheet Metal, of which metal.

clhe methods heretofore in vogue for the production of embossed and printed sheet metal have necessitated two or more opera color thereon, which is designed to be parv tially covered by printing ink While theremainder is uncovered by printing ink to bring into prominence the embossed design or characters.

I may here mention the two methods oi which I am aware which have been heretofore followed in making embossed and printed sheet metal. One of these methods involves three operations, to wit: lithographing or printing, then varnishing and finally embossing of the sheet metal. The other method involves two operations, the first of which is the embossing of the sheet metal and the second the application of printing ink to the embossing surfaces, by the use of an inked roller. In neither of these has the embossing and printing been accomplished in one operation, this being due to the fact that, if printing ink was applied to the metal embossing plate, it would not be properly transferred therefrom to the surface of the sheet metal being embossed, hence it was found necessary to apply the printing ink, as aseparate operation, either before or after the embossing operation.

In carrying out my method I utilize an elastic medium upon the embossing plate to which medium the printing ink is applied,

and I am, therefore enabled to simultane- I ously emboss sheet metal and print it, inasmuch as the elastic medium holds the ink in such manner that it will be evenly and uniformly distributed on the sheet metal surface intended to receive it.

In the accompanying drawings: Figure I is a fragmentary top or plan view of my embossing plate. Fig. 11 is an enlarged cross section taken through the embossingfpla-te on line HII, Fig. I. Y Fig. III is a section illustrating the use of my embossing plate coated for service, the .view including a plate supporting member and an impression member at opposite sides of the embossing plate and the sheet metal operated upon by said embossing plate. Fig. IV is a view of a fragment of an embossed and printed metal sheet.

In carrying out my method, I first produce an embossing plate A, in which a design has been deeply etched, so that the plate contains the design recesses a. I then apply an elastic coating 13 to the surface of the plate A. This elastic coating may be of an suitable material, but preferably comprises printing ink and gum copal. The printing ink is first distributed over the surface of the plateAv and gum copal, in powdered form, is sprinkled over the ink, after which sufiicient'heat is applied to the surface of the plate to melt and dry the gum copal to a desired stifiness. The embossing plate A is now ready for service to emboss and print a piece of sheet metal such as indicated by the numeral 1.

In performing the embossing and printing operation, the coated and inked plate A is mounted upon a suitable bed or support 2 and the sheet metal to be embossed and printed is subjected to pressure between said bed or support and a suitible impression member 3, see Fig. III. .he impression member 3 serves to press the sheet metal against the previously inked coating B on the plate A and also to force the portions of the sheet metal opposed to the recesses a of the design in the embossing plate into a said recesses, whereby the sheet metal is embossed' simultaneously with the transference of ink from the coating B to the sheet metal. The impression member 3 is preferably of a yielding nature or covered with material which will yield under pressure, and,.consequentlg, the portions of this member op- 'posed to-'theprinting surface of theplate-,A plate to simultaneously emboss and print yield sufiiciently to allow of the portions of said metallic sheet. the member opposed to the recesses a in the 2; The method of embossing and printing, embossing plate acting to press the sheet sheet metal, which consists in. applying an it 5 metal into said recesses for embossing action. elastic coating, comprising gum co al, to I claim an jembossing plate, inking the sur ace of l. The method of embossing and printing said elastic coating, and pressing a metallic sheet metal, Which consists in applying an sheet against said embosslng plate to simulelastic coating to an embossing plate, inking taneously emboss and print said metallic 20 10 the surface of said elastic coating, and press sheet. s 7 ing a metallic sheet against said embossing CHAS. F. A. RAMBERG.

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