IMPROVEMENTS IN MACHINERY FOR THE MANUFACTURE OF PAPER PULP
Year: 1871

page_text: LETTERS PATENT to Constantine De Negri; of the Hornsey Ironworks,
Hornsey Road, in the County of Middlesex, Engineer, for the
Invention of "IMPROVEMENTS IN MACHINERY FOR THE MANUFACTURE OF
PAPER PULP."
Sealed the 26th January 1872, and dated the 1st August 1871.
PROVISIONAL SPECIFICATION left by the said Constantine De Negri
at the Office of the Commissioners of Patents, with his Petition,
on the 1st August 1871.
I, CONSTANTINE DE NEGRI, of the Hornsey Ironworks, Hornsey.
Road, in the County of Middlesex, Engineer, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN MACHINERY FOR THE
MANUFACTURE OF PAPER PULP," to be as follows:-
My Invention consists of a machine for the reduction of wood to the
form of fibre or shavings for the manufacture of paper pulp.
The following is a description of the machine, and the manner in
which it is to be used according to this Invention, that is to say :-
-
The machine for reducing wood to the form of fibre or shavings
consists of a hollow cylinder open at one end and furnished with holes,

page_text: slotts, or the like for the fixing and clearing of knives or cutters, which
is made to revolve round an axis in bearings, so that a piece of wood
held against its external surface would be cut to the desired thickness;
the fibre or shaving passing through the clearance to the inside of the
cylinder would be delivered out of the open end in any desired manner.
One or more curved plates are fixed round this cylinder at an angle to
its surface and parallel to its axis of rotation without touching it, so that
a piece of wood being dropped between the opening formed by the upper
part of a curved plate and the surface of the cylinder would be held
against the surface of the cylinder, and being cut by the knives or
cutters would, as it is diminished in size, sink further into the angle
formed by the back plate and the surface of the cylinder until it is
entirely reduced to fibre or shavings.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Constantine De Negri in the Great Seal Patent
Office on the 30th January 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CONSTANTINE
DE NEGRI, of the Hornsey Ironworks, Hornsey Road, in the County of
Middlesex, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the First day of August, in the year of
our Lord One thousand eight hundred and seventy-one, in the thirty-fifth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Constantine De Negri, Her special licence that I,
the said Constantine De Negri, my executors, administrators, and assigns,
or such others as I, the said Constantine De Negri, my executors, admi-
inistrators, and assigns, should at any time agree with, and no others,.
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN MACHINERY
FOR THE MANUFACTURE OF PAPER PULP," upon the condition (amongst others)
that I, the said Constantine De Negri, my executors or administrators,
by an instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said

page_text: Invention, and in what manner the same was to be performed, and.
cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Constantine De Negri, do hereby
declare the nature of my said 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):-
My Invention consists of a machine for the reduction of wood to the
form of fibre or shavings, and the following is a description of the
machine, and the manner in which it is to be used according to this
Invention:-
The machine consists of a hollow cylinder open at one end and
furnished with holes, slotts, or the like, for the fixing and clearing of
knives or cutters, which is made to revolve round an axis in bearings,
so that a piece of wood held against its external surface would be cut
to the desired thickness; the fibre or shavings passing through the
clearance to the inside of the cylinder would be delivered out of the open
end in any desired manner. One or more curved plates are fixed round
this cylinder at an angle to its surface and parallel to its axis of rotation
without touching it, so that a piece of wood being dropped between the
opening formed by the upper part of a curved plate and the surface of
the cylinder would be held against the surface of the cylinder, and
being cut by the knives or cutters would as it is diminished in size be
carried further into the angle formed by the back plate and the surface
of the cylinder until it is entirely reduced to fibre or shavings.
And in order to explain my Invention more completely I will now
proceed to describe the Sheet of Drawings hereunto annexed.
DESCRIPTION OF DRAWINGS.
Figure 1 is a front elevation, and Figure 2 a side sectional elevation
of a machine according to my Invention, similar letters of reference
being employed in both views to denote corresponding parts.
a is a hollow cylinder open on the left side, Figure 1, and in front
in Figure 2, furnished with slotts at 6 for the fixing and clearance
of knives revolving in bearings c; d is a large curved plate round the
cylinder at an angle to its surface and parallel to its axis of rotation,

page_text: to get at the knives in the cylinder and adjust them when necessary;.
e is a hopper formed by the prolongation of, the two ends of the curved
plate, by which the wood to be cut up is introduced; f represents a
piece of wood being operated upon; g are loose and tight riggers for,
driving the machine by, and k is a fly wheel.
Having thus described the nature of my Invention, and the manner.
in which the same is to be performed, I would have it clearly under-
stood that what I claim is the use of a curved back plate or plates,
and the general arrangement and construction of the machine as herein
described.
In witness whereof, I, the said Constantine De Negri, have here-
unto set my hand and seal, this Twenty-ninth day of January, in
the year of our Lord One thousand eight hundred and seventy-
two.
CONSTANTINE DE NEGRI. (L.S.)