Improvements in Renewing Engraved Copper Rollers.
Year: 1892

page_text: Date of Application, 5th Mar., 1892
Complete Specification Left. 19th Nov., 1892-Accepted, 31st Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Renewing Engraved Copper Rollers.
We, ROBERT OSBORNE, of the firm of David Fulton and Company, of Duke
Street Engraving Works, Glasgow, in the County of Lanark, North Britain, and
HENRY DODD, Manager to the said Company, do hereby declare the nature of this
invention to be as follows, that is to say :-
This invention has for its object the renewal of engraved copper rollers such as
are used by calico printers, in an improved, simple, expeditious, and economical
manner.
When a copper roller has to receive a new or fresh design it has hitherto
generally been the practice to turn off the surface to the depth of the engraved
work on it, thus reducing the diameter and forming a quantity of copper turnings or
waste of greatly diminished value. In carrying out the present invention no reduc-
tion of diameter or waste takes place, but the indentations constituting the engraved
design are simply filled up to the original surface. For this purpose the roller
surface and especially the engraved indentations are thoroughly cleansed, and after
the unengraved surface has been coated with a suitable protective varnish, the
roller is placed in an electro-plating bath containing a suitable solution of a
salt of copper, and copper is deposited in the engraved indentations until they are
filled.
The
The copper roller may be cleansed by means of an alkaline solution, or an
acid solution, or a volatile or other suitable solvent which will completely
remove all coloring or other matter from the engraved indentations.
electro-plating process is continued until the indentations are completely filled,
and preferably until a slight excess has been deposited; after which the roller is
subjected to the ordinary polishing operation.
Dated this Fourth day of March 1892.
EDMUND HUNT,
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Renewing Engraved Copper Rollers.
We, ROBERT OSBORNE, of the firm of David Fulton and Company, of Duke
Street Engraving Works, Glasgow, in the County of Lanark, North Britain, and
HENRY DODD, Manager to the said Company, 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, that is to say :-
This invention has for its object the renewal of engraved copper rollers such as
are used by calico printers, in an improved, simple, expeditious, and economical
manner.
When a copper roller has to receive a new or fresh design, it has hitherto
generally been the practice to turn off the surface to the depth of the engraved
work on it, thus reducing the diameter and forming a quantity of copper turnings
or waste of greatly diminished value. In carrying out the present invention no
reduction of diameter or formation of waste takes place, but the indentations
constituting the engraved design are simply filled up to the original surface. For
this purpose the roller surface and especially the engraved indentations are
thoroughly cleansed, and after the unengraved surface has been coated with a
suitable protective varnish, the roller is placed in an electro-plating bath
Doll

page_text: containing a suitable solution of a salt of copper, and copper is deposited in the
engraved indentations until they are filled.
The copper roller may be cleansed by means of an alkaline solution, or an
acid solution, or a volatile or other suitable solvent which will completely
remove all coloring or other matter from the engraved indentations. In the
case of an ordinary copper roller such as is used by calico printers, we find that
satisfactory results are obtained by employing a strong solution of caustic soda
in which the roller is immersed and which is heated up to the boiling point.
After being treated with the caustic soda solution the roller must be immersed
in clean boiling water to complete the cleansing.
In the electro-plating process we find good results are obtained with a bath
made up of sulphate of copper, commercial sulphuric acid, and water in the propor-
tions of 52 pounds sulphate of copper and one gallon sulphuric acid to every
26 gallons of water. The electric current should be of a strength of about
one volt.
The electro-plating process is continued until the indentations are completely
filled, and preferably until a slight excess of copper has been deposited; after
which the roller is subjected to the ordinary polishing process.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
- The renewing of engraved copper rollers by depositing copper in the engraved
indentations after thoroughly cleansing the rollers substantially as hereinbefore
described.
Dated this Eighteenth day of November 1892.
EDMUND HUNT,
Applicants Agent.