Improvements in Electrotype Printing Blocks.
Year: 1891

page_text: Date of Application, 3rd Sept., 1891
Complete Specification Left, 24th Nov., 1891-Accepted, 30th Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Electrotype Printing Blocks.
We, AUGUSTE DÉSIRÉ STOESSER and AUGUSTE STOESSER, Junior, of
122 Boulevard St. Germain, Paris in the Republic of France, Electro-typers,
do hereby declare the nature of this invention to be as follows:-
These improvements relate to the lining or backing of typographic printing
blocks produced by electro-deposition.
Printing blocks obtained in the ordinary way by electro-deposition on a suitable
form or mould, when employed on the rotary machines at present in use for typo-
graphic printing in black and in colors, require to be curved to suit the cylinders
of the machines, and to be lined or backed to the required thickness to allow of
their being placed upon said cylinders.
Our method of lining or backing is as follows:-
The printing block is produced in the ordinary manner by electro-deposition,
in the form of a plate of dimensions varying according to the size of the
engraving.
The electrotype is then rolled in a suitable rolling apparatus in a hot state
whereby the desired curvature is imparted thereto.
After this, the internal face (that is to say that side which is turned away from
the engraving) of the electrotype, is coated, whilst the electrotype is still hot,
with a layer of stearine.
Upon this coat of stearine there is applied a rolled sheet of an alloy containing
40 per cent. of tin, and upon the latter there is cast a quantity of typographic alloy
sufficient to form the thickness it is desired to obtain.
The heat of the alloy is sufficient to melt the sheet of tin which forms a perfect
soldering or weld between the electrotype proper and its lining or backing. In
this way printing blocks can be obtained of any desired thickness.
Dated this 3rd day of September 1891.
COMPLETE SPECIFICATION.
Improvements in Electrotype Printing Blocks.
We, AUGUSTE DÉSIRÉ STOESSER, and AUGUSTE STOESSER Junior, of
122 Boulevard St. Germain, Paris in the Republic of France, Electro-typers, do
hereby declare the nature of this invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement:-
This invention has reference to an improved method of lining or backing up
typographic printing blocks produced by electro-deposition.
Printing blocks obtained. in the ordinary way by electro-deposition on a suitable
form or mould, when employed on the rotary machines at present in use for printing
in black and in colors, require to be curved to suit the cylinders of the machines,
and to be lined or backed up to the required thickness to allow of their being
placed upon said cylinders.

page_text: it.
Our method of lining or backing up such blocks is as follows:-
The printing block or electrotype is produced in the ordinary manner by electro-
deposition in the form of a plate or shell of dimensions varying according to the
size of the printing surface desired. The electrotype is then rolled whilst in a hot
state in a suitable rolling apparatus whereby the desired curvature is imparted to
After this has been done, the internal or concave face (that is to say the side
opposite to the printing surface) of the electrotype, is coated, whilst the electro-
type is still hot, with a layer of stearine (applied by a brush or otherwise) upon
which is placed a rolled sheet of an alloy containing say 40 per cent. of tin, and say
cent. of pure lead, and upon the latter there is cast a quantity of typo-
graphic alloy (say 15 per cent. of antimony and 85 per cent. of pure lead) sufficient
to form the thickness it is desired to obtain. The heat of the alloy is sufficient to
melt the sheet of tin and lead alloy which forms a perfect soldering, weld or union
between the electrotype proper and its lining or backing. In this way printing
blocks can be obtained of any desired thickness.
60
per
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what I
claim is :-
The herein described method of lining or backing up electrotype printing blocks
for use on rotary machines, by coating the inner or concave surface of the block
with stearine after the block has been rolled to the desired curve and whilst it is
hot, then applying a sheet of tin and lead alloy to the coated surface, and casting
a suitable quantity of typographic alloy upon the sheet of tin alloy.
Doted this 24th day November 1001
A. D. STOESSER,
By L. W., per F. B.
A. STOESSER,
By L. W., per F. B.