FR2753115A1 - Manufacturing procedure for medals or similar with portrait outlines taken from photographs - Google Patents

Abstract

A procedure for making medals, plaques or shields with outlines of portraits, decorations or articles taken from photographs consists of taking an impression from a photograph with the aid of a black-and-white scanner to obtain a film, correcting the film on paper and using the result to engrave a metal plate by means of typogravure. The metal plate is cut out and treated by electrolysis so that it can be used as a matrix in a mould from which the medal or other article is cast, after which the outlines can be filled in with a varnish, ink or paint.

Description

The present invention makes it possible to produce loops, plates or medals, engraved with features of portraits, decorations or objects, in precious metals or not with very high precision and resemblance. From a photograph, line drawing from a black flat special function scanner, the line photo is processed to produce a negative or a positive. The native or the positive can be worked by hand directly to eliminate the extra features or add more when they are missing. It can also be transformed on paper with a laser photocopier or other system for greater ease of reading, which simplifies the work of finding the features that must be added or removed and it is also easier to work on paper. than on film. This can be done by hand or using a computer. The engraving of the matrix will be carried out according to several methods:
The tyo.ravure (photogravure) on zinc, well known to printers, by contact we go from the positive stage of copying on zinc plate previously presensitized, we develop the sensitive plate, we insulate it in a frame then we put it in the engraving machine in which a mixture of acid and hydrocarbon etches the plate. You can also make a romper pass for the depth of the lines. This matrix will then be cut to the desired size and shape. It will then be inserted into an elastomer mold or other mold material (the one used by dentists is very precise and allows the slightest features to be respected for greater resemblance). Demoulding, casting of metal (gold, silver, etc.), polishing. Then, introduction or not in the engraved lines of a varnish, a paint or a paste or mother-of-pearl etc ...

Wiping, buffing, finishing.

 You can also use the zinc matrix by removing the sensitive layer on the face and the varnish on the back. The plate being engraved and naked, it can be polished and varnished and can also be treated by electrolysis for any metallization with then the same finishes as previously.

 You can also directly engrave the work of the lines: with the laser; computer point engraving or pyrography system; on all supports.

 Of course you can get the series, by reproducing the same engraving or by making the unit in series (ex: what is suitable for personalized portraits). Several engraved dies are on the same plate and cut using a tool which reduces the cost since we collect the work laughed for the search for lines on the same document which is then engraved at the same time, in one only once on the same plate.

Claims (4)

CLAIM  1) Process for producing medals, plates and loops, engraved with portrait lines, decorations, objects, from metal photos, characterized in that a line print is made from the photo to obtain a film with a black scanner, we correct the film on paper. The result is engraved to obtain the plate engraved on metal (matrix) using the typogravure method.  2) production method according to claim 1) characterized in that one uses directly the metal plate engraved and cut by treating it by electrolysis for all metallizations by first removing on the face the sensitive layer and on the back the varnish .  3) Production method according to claim 1) characterized in that one uses the engraved and cut plate which becomes the matrix to insert it into a mold and the metal is poured (gold, silver)  4) production method according to claim 1) characterized in that each engraved and metallized model (in gold, gold plated, silver, silver) ends with an introduction into the lines of a varnish, an ink, a painting.