IMPROVEMENTS CONNECTED WITH REVOLVING PAPER PULP KNOTTER OR STRAINER MACHINERY
Year: 1877

page_text: LETTERS PATENT to James Hunter Annandale, of the Polton Paper Works,
Lasswade, in the County of Edinburgh, North Britain, for the Invention
of "IMPROVEMENTS CONNECTED WITH REVOLVING PAPER PULP KNOTTER OR
STRAINER MACHINERY."
Sealed the 11th January 1878, and dated the 6th November 1877.
PROVISIONAL SPECIFICATION left by the said James Hunter Annandale
at the Office of the Commissioners of Patents on the 6th November 1877.
JAMES HUNTER ANNANDALE, of the Polton Paper Works, Lasswade, in the
County of Edinburgh, North Britain. "IMPROVEMENTS CONNECTED WITH REVOLVING
PAPER PULP KNOTTER OR STRAINER MACHINERY."
My Invention relates to improvements connected with revolving paper pulp.
knotter or strainer machinery, and has principally for its object to construct the
suction apparatus in such manner that it will work with greater efficiency, less
motive power, less tear and wear, be less expensive, and, besides, ensuring great
durability.
In order to produce by the known methods the suction necessary to draw the
paper pulp through the fine slits in the strainer plates, and to throw off or clean
away knots or other obstructing matter from the slits, arrangements of internal
flexible tubes or bellows, internal metallic cylinders and pistons, with or without
packing, and external pumps connected to the inside of the strainer have been used,
all of which are attended by great tear and wear and consumption of power in
friction.
'
According to my Invention, I fit metallic dished or cup-shaped plates on a central
tube, and on one or on both faces of the plates I attach rubber or other elastic rings,
these being also attached to fixed flange rings of the strainer cylinder to form
diaphragms, such diaphragms however may be composed wholly of rubber or other
elactic material, or partly of metal and partly of rubber or other elastic material,

page_text: these being attached to a central tube, which is perforated where necessary, and is
driven in the ordinary method common to strainers. I thus save all the friction of
cylinders and pistons, the tear and wear of expensive internal bellows, and the
power required and dirt engendered by the use of pumps.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Hunter Annandale in the Great Seal Patent Office on the
6th May 1878.
JAMES HUNTER ANNANDALE, of the Polton Paper Works, Lasswade, in the
County of Edinburgh, North Britain. "IMPROVEMENTS CONNECTED WITH REVOLVING
PAPER PULP KNOTTER OR STRAINER MACHINERY."
My Invention relates to improvements connected with revolving paper pulp
knotter or strainer machinery, and has principally for its object to construct the
suction apparatus in such manner that it will work with greater efficiency, less
motive power, less tear and wear, be less expensive, besides ensuring great
durability.
In order to produce by the known methods the suction necessary to draw the
paper pulp through the fine slits in the strainer plates, and to throw off or clean
away knots or other obstructing matter from the slits, arrangements of internal
flexible tubes or bellows, internal metallic cylinders and pistons, with or without
packing, and external pumps connected to the inside of the strainer have been used,
all of which are attended by great tear and wear and consumption of power in
friction.
According to my Invention, I fit metallic dished or cup-shaped plates on a central
tube, and on one or on both faces of the plates I attach rubber or other elastic or
flexible rings, or metallic rings, these being also attached to fixed flange rings of the
strainer cylinder to form diaphragms; such diaphragms however may be composed
wholly of rubber or other elastic material, these being attached to a central tube,
which is perforated where necessary, and is driven in the ordinary method common
to strainers. I thus save all the friction of cylinders and pistons, the tear and wear
of expensive internal bellows, and the power required and dirt engendered by the
use of pumps.
My Invention will be clearly understood by reference to the annexed Drawing,
which represents a revolving knotter of ordinary construction, with my diaphragms
fitted thereto.
A is the outer casing, into which the raw paper pulp is placed from the vats;
B is the revolver or strainer vessel caused to rotate in the outer casing A by gearing
or strap motion, as found convenient; "C, C, are knotter or slitted strainer plates,
arranged in segmental form upon the end plates D, D, and intermediate ring stays E,
which are fixed to discs F, F, upon a central hollow shaft G, the discs having broad
inner shoulders H, H, which may be packed, if desired, to enable the hollow shaft to
slide freely to and fro in them; or the packing may be entirely dispensed with,
as shewn at S, Figure 2. This shaft G has a series of flanged cup-shaped or dished
plates I, I, fixed to it, which partake of a to-and-fro motion corresponding to that of
The

page_text: the shaft from an eccentric or crank from the end to which the connecting rod J is
attached.
The outer periphery edges or faces K, K, have connected to them by rings L, L,
and screw pins M, M, elastic or flexible rings N, N, one to each; or metallic rings
may be used, if desired, and the larger diameters of these rings are fitted to flanges
of the fixed stays E, where the elastics are held by rings P, P, and screw pins Q, R,
in a firm manner.
In action the inner vessel or strainer, and the parts connected to it, as also the
central shaft, revolve, the central shaft having an independent to-and-fro motion at
the same time to cause an alternate suction and repelling action upon the pulpy
mass, that is, within the outer casing A through the diaphragms moving within the
chambers R, R. The suction by the diaphragms causes the fine fibres and pulp to
pass through the slits into the interior of the strainer, within which they are
collected and ultimately forced out at the end pipe. T into a receiver, the back or
repelling action of the diaphragm forcing the knots and other solid impurities which
had previously been drawn against the slits back into the casing A, and clearing
the slits for the next suction, and so on alternately.
Instead of elastic, metallic, or other flexible rings N, N, being only at the outer
peripheries of the dished plates I, I, other elastic, metallic, or flexible rings may be
fitted near the smaller diameter of the fixed plates F, as at S, Figure 2, the inner
peripheries being attached to short flanges on the pipe G.
Having now described the nature of my said Invention, and in what manner the
same is to be performed, I declare that I claim the employment of cup-shaped or
dished plates and elastic, metallic, or flexible rings forming diaphragms within
revolving knotters or strainers of paper pulp machinery, for securing the desired and
necessary suction power, one portion of the diaphragms being fixed to the partition
or stay rings, and the other part to flanged connections on the central shaft, which
travels to and fro, as set forth, and substantially as shown at Figure 1 of the
annexed Drawings, and in the modification, Figure 2.
In witness whereof, I, the said James Hunter Annandale, have hereunto set
my hand and seal, this Second day of May, One thousand eight hundred
and seventy-eight.
JAMES HUNTER ANNANDALE. (L.S.)