US1023773A - Apparatus for printing engravings in intaglio. - Google Patents

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A.-VALBNTIN, J. ZERREISS & H. GEORGES. APPARATUS FOR PRINTING ENGRAVINGS IN INTAGLIO.

APPLICATION FILED MAY 29, 1911.

Patented Apr. 16, 1912.

APPARATUS r012. PRINTING nneaavmcs 11v m'racmo.

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Specification of Letters latent.

Patented Apr.16, 1912.

Application filed May 29, '1911. Serial naeaalsi.

To all whom it may ooncem: 4 4

Be it known that we, AUcUs'rn VALENTIN, JEAN ZERREIss,and HENRI Gnoncns, residin at Puteaux, France, have invented new a-n useful Improvements in Apparatus for Printing of Engravings in Intaglio, of which the followingis a specification.

The printing of engravings in intaglio, in which scraper wiping is used, is usually effected from cylinders engraved in intaglio, and for direct impression it is not possible to engrave illustrations otherwise than on a single cylinder of greater length than the width of the paper, as the edges ofthe said cylinder would trace marks on the pa.- per at the time of printing. On the other hand, when it is desired to print together engravings in intaglio and letterpress for printing illustrated matter, it frequently,

happens that the engravings are"arranged' in the text in a small number, and in a large number of cases there are only one or two engravings on the whole sheet of paper.

Direct printing therefore necessitates in all cases the use of a cylinder of greater length than the width of the paper to be printed,

which implies a delicate adjustment of a scraper on the whole length of the cylinder, even in those cases in which there is only one engraving on the said cylinder, which makes theoperations long and expensive. Indirect printing enables the aforesaid '-disadvantages tobe avoided. It is in fact possible to limit the pressure of the transferring blanket on the surface of the engraved portions, by suitably arranging under the blanket raised portions bearing only onthe engravings, which makes itv possible to use for the engravi-n cylinders of smaller length than the wldth of the paper, and it even becomes possible to combine on one and the same mandrel one or more sleeves engraved in intaglio, the edges or joints of which will not leave any mark on the paper at the time of printing, and which will enable scrapers to be used which do not exceed jthe length of the engraved sleeves, whichgreatly simplifies the adjustment of "the scrapers and renders the operations quicker and less expensive.

This invention relates to the use of such sleeves engraved in intaglio and also'to a device enabling the said sleeves to be used for indirect impression .of engravings. in intaglioa .1

The figure is a transverse sectional view question being afte through the impression roller and through the transfer-roller showing in elevation the wipers. I l

The device comprises: 1. ,A steel mandrel 1 provided at each of its ends "with trunnions Qandj 3:1whioh are adapted to engage with the bearings of the machine. 2. A

series of cylindrical steel sleeves 4 which are covered by electrolysis with a layer of copper, then trued and suitably polished to rece1ve the engraving. 3. A series of rings 5 which are used for filling up the spaces that may be left between the engraved sleeves arranged on the mandrel.

The mandrel 1 consists of a steel spindle terminating at each of its ends in trunnions 2 and 3. This mandrel has also a screwthreadedportion 6 on which is engaged the slide with slight frictionon' the mandrel 1. .These rings, covered with an electrolytic copper deposit, are perfectly polished and afterward engraved in intaglio by any,

known engraving process, the sleeves 1n rward placed at the deslred point of the mandrel 1.

The rings5 are of less thickness than the sleeves, so as to'enable the intervals separating the engraved sleeves to be filled whenthe positions of the said sleeves on the mandrel 1 are determined in accordance with a given arrangement. 7

The operation of the device will be readily understood. 4

First of all, the first engraved sleeve is placed on the mandrel 1, and its longitudlnal. position adjusted. Then the second sleeve is placed in position, then the others, the intervals being filled successively with a series of rings of suitable thickness. The nut 7 is then tightened, and will press against the'engraved sleevesand keep them in place. The mandrel thus arranged is placed on the printing machine, and the sleeves rotated so as to bring the engravings into correct position, that is, so that they will be printed at the point which they have to occupy on the paper. When the position is determined, the nut 7 is screwed home and the engraved sleeves will be thus fixed on the mandrel. After having stuck, by glue for instance, to the cylinder C projectlons or raised portions 10 constituted by a suitable thickness of paper or any other material, the blanket '11 1s stretched on the cylinder, and the projections or raised portions will mark in relief on the surface of the said blanket, the surfaces of the engravings. The scrapers 12, 13 and 14 are then adjustedm the usual manner, and the printing can be proceeded with.

We claim In an apparatus for printing engravings in intaglio, a mandrel, a plurality of engraved sleeves mounted upon the mandrel, a cylinder, an elastic blanket stretched upon the cylinder, and bodies interposed between the blanket and the cylinder providing. projections upon the surface of the blanket.

In testimony whereof we affix our signature in presence of two witnesses.

J ULIEN EAVERNE.

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