IMPROVEMENTS IN MACHINERY USED IN MAKING PAPER
Year: 1870

page_text: LETTERS PATENT to Yates Duxbury, of Hall i' th' Wood Paper Works;
near Bolton, in the County of Lancaster, Paper Manufacturer, for.
the Invention of "IMPROVEMENTS IN MACHINERY USED IN MAKING
PAPER."
".
Scaled the 1st July 1870, and dated the 5th January 1870..
PROVISIONAL SPECIFICATION left by the said Yates Duxbury at the
Office of the Commissioners of Patents, with his Petition, on the -
5th January 1870..
I, YATES DUXBURY, of Hall i' th' Wood Paper Works, near Bolton, in
the County of Lancaster, Paper Manufacturer, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN MACHINERY USED IN
MAKING PAPER," to be as follows:-
-
The Invention consists in the application of a roller fixed between the
bottom couch roller and the first wet felt roller of a paper making..
machine. The machine wire web after passing between the top and
bottom couch rollers will lap round and drive this roller instead of.
lapping round the bottom coucher as is now done.
.

page_text: The Invention allows the atmosphere free access underneath the
machine wire web after leaving the couchers, and causes the paper web
to leave the wire web more freely.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Yates Duxbury in the Great Seal Patent Office
on the 2nd July 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, YATES
DUXBURY, of Hall i' th' Wood Paper Works, near Bolton, in the County
of Lancaster, Paper Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fifth day of January, in the year
of our Lord One thousand eight hundred and seventy, in the thirty-
third year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Yates Duxbury, Her special license,
that I, the said Yates Duxbury, my executors, administrators, and
assigns, or such others 'as I, the said Yates Duxbury, my executors,
administrators, 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 USED IN MAKING PAPER," upon the condition (amongst others)
that I, the said Yates Duxbury, by an instrument in writing under my
hand and seal, should particularly describe and ascertain the nature of
the said 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 Yates Duxbury, 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 thereof, and the accompanying Drawings (that:
is to say):-
In ordinary paper making machines the endless wire web carrying the
layer of pulp from the pulp vat passes under the upper couch roller and -

page_text: round the lower couch roller and then returns, and the couched pulp
which has been forced more or less into the meshes of the wire web'is
withdrawn therefrom while it is opposite to and against the lower couch
roller where the atmosphere cannot get to the back of the wire web, and
consequently the pulp has a tendency to adhere to the wire web to such
extent that a layer of couched pulp for thin paper has scarcely strength
sufficient to be withdrawn from the wire web and frequently..breaks in
the act of doing so, thus requiring constant care, and attention.
The object of my Invention is such an arrangement as will tend to
lift the couched pulp from the wire web and allow the atmosphere to be
freely admitted to the back of that part of the wire web which is for the
time being between the lower couch roller and the point where the
couched pulp is withdrawn from the wire web, and my Invention
consists in the addition of one or more roller or rollers for the endless
wire web to pass over after passing over the lower couch roller and
before returning to receive a fresh layer of pulp and so arranged that the
couched pulp will be withdrawn from the wire web at a point after the
atmosphere has had free access.
Figure 1 is a side elevation of one modification of my Invention with
one such additional roller; and Figure 2 is a similar view of another
modification with two such additional rollers. Only so much of the
machine is shewn as will be required to illustrate my Invention. In
each Figure a represents the upper couch roller; b, the lower couch
roller; d, the endless wire web which in the ordinary machine returns
immediately after passing round the lower couch roller; e is one of the
rollers carrying the endless "wet felt" to which the pulp passes from
the endless wire web.
I carry out my Invention according to one modification illustrated in
Figure 1 by adding a roller ƒ in suitable bearings and causing the wire
web d (shown in peculiar dotted line) after passing over the lower couch
roller to pass round the roller fand then return, and by fixing the roller e
for the endless wet felt h (shewn in peculiar dotted line) in such position
that the couched pulp (represented by the peculiar dotted line k), will be
withdrawn from the wire web as shewn.
I carry out my Invention according to the other modification as
illustrated by Figure 2, where two additional rollers ƒ and f¹ are
employed for the wire web (d) to pass over, and the wet felt roller (e) is
fixed as shewn, the couched pulp (%) being withdrawn more directly

page_text: from the face of the wire web (d). To loosen the couched pulp from the
wire web more effectually I cause a current, of air to blow against the
under side of the wire web by fixing a pipe (7) across the machine, as
shewn in Figures 1 and 2, this pipe having a slit in it extending the
entire width of the wire web. The air is supplied to the pipe (1) from 5
a centrifugal fan or a pump of any ordinary construction...
I have now particularly described the nature of my Invention and the
mode of carrying it into effect, and claim as my Invention the use of ono
or more additional roller or rollers (f, or f, and f¹,) for the endless wire
web (d) and so arranged in relation to the first wet felt roller (e) that 1
the couched pulp (k) may be withdrawn from the endless wire web
where the atmosphere has had free access to the back of it, substantially
as herein-before described and illustrated by the Drawings..
In witness whereof, I, the said Yates Duxbury, have hereunto set
my hand and seal, this Thirtieth day of June, in the year of 1
our Lord One thousand eight hundred and seventy.
YATES DUXBURY. (L.S.) ;