Improvements in Paper Making Machinery.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Paper Making Machinery.
I, DENNIS BERNARD MCMURRAY, of Fitchburg, in the County of Worcester,
Commonwealth of Massachusetts, one of the United States of America, Inventor,
do hereby declare the nature of this invention to be as follows:-
This invention has for its object to improve that class of paper making machines
known as Fourdrinier, my improvements relating especially to the pressure bar
or device commonly called guard board co-operating with the felt covered couch
roll located above the endless belt or wire on which the paper is laid and
formed for the production of the web.
The surface of every part of the covering of this roll has to be washed between
the time that it leaves and again contacts with the web, so that the covering of
said roll shall not put back on the web any foreign specks or material taken
up by it.
The couch roll is washed by a constantly running stream of water put on top
of the roll at a point behind a perpendicular line drawn through the axis or centre
of rotation of said roll, and consequently to prevent any specks or motes taken from
the roll by the stream of water getting back onto the web of paper or the water
used to wash the roll and getting onto the paper, a pressure bar or device commonly
called guard board is located back of the upper centre line of said roll, said
pressure bar or device fitting closely the cloth or other covered surface of the
couch roll.
The pressure bar bears heavily on the surface of the couch roll and by reason
of the pressure exerted by it the covering of the roll or of the bar is rapidly
worn away,
In accordance with my invention the pressure bar or device is composed of a
bar having its edge next said couch roll an inflated or distended indiarubber tube
suitably covered and opposed to and so as to bear against the surface of the

page_text: covering of the couch roll, said inflated tube presenting a surface which may
yield to the imperfections of the covering jacket of the couch roll yet removing
any adhering lump, speck or foreign substance brought up by the couch roll, and
yet keep a firm substantially water-tight contact with the covering of said roll.
This tube may be inflated either with air, gas, water or other liquid and under
more or less pressure, the greater the pressure, the less unyielding the tube,
yet the bar will always be free to yield more or less to the requirements of
the work.
Let it be supposed, that most or part of the framing of a Fourdrinier machine
for making paper is used with an ordinary cloth or other surface couch roll; there
will be provided a roll with which said couch roll co-operates, said roll being
preferably surrounded by the usual belt or wire employed in the machine.
The ordinary cloth roll is carried by its shaft; the co-operating roll is carried
by another shaft.
The frame has erected upon it at each side, suitable stands, jointed to which is
a movable frame, said frame having suitable bearings for the cloth roll shaft,
while the frame has suitable bearings for the roll co-operating shaft.
The movable frame has an upright portion, having suitable slots or holes in
which may be located suitable bolts, said bolts being passed through a pressure bar
or device commonly called a guard board.
The lower edge of this pressure bar or device has applied to it a flexible pipe, a
little longer preferably than the couch roll, and the opposite ends of said pipe
may be plugged or filled in with metallic plugs, said plugs being firmly secured
in said pipe, the inner ends of the plugs preferably falling just at or outside the
ends of the couch roll.
One of the plugs, or one end of the tube, may have fitted to it a valve stem,
which may be connected with any usual or suitable air pump, such as commonly
used for inflating bicycle or other tires, or said valve stem may be connected with
any pump to force gas or liquid or fluid into said pipe in order to inflate it, the
degree of pressure determining the hardness or yielding quality of the tube.
This tube is enclosed within a covering, of felt, cloth, or other usual material,
the covering contacting directly with the covering of the couch roll, but the feit
cloth by being backed up by the inflated tube will, it is obvious, be free to yield
as required.
I make and maintain a substantially watertight connection between the covering
constituting the acting face of the pressure bar or device, and the surface of the
covering of the couch roll.
In practice I find the pressure bar or device having an inflated tube at its acting
edge, which maintains an even pressure throughout the length of the couch roll,
results in reduction of power required to operate the couch roll, increases the life
of the belt or wire, prevents the vibration of the bar or guard board, and results in
very much less wear on the cover of the couch roll, and besides it is more efficient
in operation than a pressure bar having its edge bare or surrounded only by a
felt or other fibrous cover.
While a round plane surfaced tube operates to excellent advantage, yet this
invention is not limited to the particular shape of said tube in cross section or to
the fact of the tube being more or less smooth externally.
It is preferably to seat that side of the flexible pipe or tube nearest the guard
board in a concaved seat; this concaved seat I prefer to form of sheet metal, the
concave running parallel with the edge of the guard board, the shank of
the concave running preferably against the top of the guard board underneath
the felt covering, said shank being attached to the guard board by suitable screws.
The covering is held on the guard board by any usual or suitable tacks.
The guard board may be backed up at its upper edge by suitable hand screws.
Dated the Sth day of August 1898.

page_text: I, DENNIS BERNARD MCMURRAY, of Fitchburg, in the County of Worcester,
Commonwealth of Massachusetts, one of the United States of America, Inventor,
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 for its object to improve that class of paper making machines
known as Fourdrinier, my improvements relating especially to the pressure bar
or device commonly called guard board co-operating with the felt covered couch
roll located above the endless belt or wire on which the paper is laid and
formed for the production of the web.
The surface of every part of the covering of this roll has to be washed between
the time that it leaves and again contacts with the web, so that the covering of
said roll shall not put back on the web any foreign specks or material taken
up by it.
3
The couch roll is washed by a constantly running stream of water put on top
of the roll at a point behind a perpendicular line drawn through the axis or centre
of rotation of said roll, and consequently to prevent any specks or motes taken from
the roll by the stream of water getting back onto the web of paper or the water
used to wash the roll and getting onto the paper, a pressure bar or device commonly
called guard board is located back of the upper centre line of said roll, said
pressure bar or device fitting closely the cloth or other covered surface of the
couch roll.
The pressure bar bears heavily on the surface of the couch roll, and by reason
of the pressure exerted by it the covering of the roll or of the bar is rapidly
worn away.
In accordance with my invention the pressure bar or device is composed of a
bar having its edge next said couch roll an inflated or distended indiarubber tube
suitably covered and opposed to and so as to bear against the surface of the
covering of the couch roll, said inflated tube presenting a surface which may
yield to the imperfections of the covering jacket of the couch roll yet removing
any adhering lump, speck or foreign substance brought up by the couch roll, and
yet keep a firm substantially water-tight contact with the covering of said roll.
This tube may be inflated either with air, gas, water or other liquid and under
more or less pressure, the greater the pressure, the less unyielding the tube,
yet the bar will always be free to yield more or less to the requirements of
the work.
Fig. is a front elevation, partially broken out, of the couch roll, its under
co-operating roll, and my improved pressure bar or device;
Fig. 2 is an end elevation of the parts shown in Fig. 1; and
Figs. 3 and 4 are details showing the opposite ends of the tube b with its plugs or
blocks.
A represents, let it be supposed, part of the framing of a Fourdrinier machine
for making paper; B ordinary cloth or other surface couch roll; C the roll with
which said couch-roll co-operates, said roll C being preferably surrounded by the
usual belt or wire employed in the machine.
The roll B is carried by a shaft B¹; the roll C is carried by a shaft C¹.
The frame A has erected upon it at each side, suitable stands A', to which is
jointed at A2 a movable frame D, said frame having suitable bearings for the
shaft B, while the frame A has suitable bearings for the shaft C¹.
The frame has an upright portion D', having suitable slots or holes in which

page_text: may be located suitable bolts a, said bolts being passed through a pressure bar
or device a' commonly called a guard-board.
The lower edge of this pressure bar or device has applied to it a flexible pipe b,
a little longer preferably than the couch roll, and the opposite ends of said pipe
may be plugged blocked or filled in with metallic blocks or plugs 61, 62, said
plugs or blocks being shown in the detailed Figs. 3 and 4, they being firmly
secured in said pipe, the inner ends of the plugs or blocks preferably falling just
at or outside the ends of the roll B.
One of the plugs, or blocks or one end of the tube, as 2, may have fitted to it
a valve stem 63, which may be connected with any usual or suitable air pump,
such as commonly used for inflating bicycle or other tyres, or said valve stem may
be connected with any pump to force gas or liquid or fluid into said pipe in
order to inflate it, the degree of pressure determining the hardness or yielding
quality of the tube.
This tube is enclosed within a covering, as c, of felt, cloth, or other usual
material, the covering contacting directly with the covering of the couch roll, but
the felt cloth by being backed up by the inflated tube will, it is obvious, be free to
yield as required.
I make and maintain a substantially water tight connection between the covering
constituting the acting face of the pressure bar or device, and the surface of the
covering of the couch roll.
In practice I find the pressure bar or device having an inflated tube at its
acting edge, which maintains an even pressure throughout the length of the
couch roll B, results in reduction of power required to operate the couch roll,
increases the life of the belt or wire, prevents the vibration of the bai or guard
board, and results in very much less wear on the cover of the couch roll, and
besides it is more efficient in operation than a pressure bar having its edge bare
or surrounded only by a felt or other fibrous cover.
While a round plane surfaced tube operates to excellent advantage, yet this
invention is not limited to the particular shape of said tube in cross section or to
the fact of the tube being more or less smooth externally.
It is preferable to seat that side of the tube b nearest the guard board in a
. concaved seat; this concaved seat I prefer to form of sheet metal, as at f,
the concave running parallel with the edge of the guard board, the shank f
of the concave running preferably against the top of the guard board underneath
the felt covering c, said shank being attached to the guard board by suitable
ccrews.
C
The covering c is held on the guard board by any usual or suitable tacks as c*.
In Fig. 1, I have broken away part of the covering to show the shank of the
concave under it.
The guard board may be backed up at its upper edge by suitable hand screws H.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. In a paper making machine, a couch roll, combined with a pressure bar,
guard board or device having at its acting edge an inflated tube, substantially
as described.
2. In a paper making machine, a couch roll, combined with a pressure bar,
guard board or device, having at its acting edge an inflated tube, said tube being
inclosed by a covering, substantially as described.
3. In a paper making machine, a couch roll, combined with a pressure bar,
guard board or device, having at its acting edge an inflated tube, said tube having a
connected valve stem, substantially as described.
4. In a paper making machine, a couch roll, combined with a pressure bar,
guard board or device having at its acting edge an inflated tube, said tube
being provided with a rigid plug or block, substantially as described.

page_text: 5. In a paper making machine, a couch roll, combined with a pressure bar,
guard board, or device having at its acting edge an inflated tube, said tube being
provided at its opposite ends with plugs or blocks, one of said plugs or blocks
having a valve stem, substantially as described.
6. In a paper making machine, a couch roll, and means to sustain its shaft;
combined with a pressure bar, guard board or device having at its acting edge
parallel to said roll, a tube; and a fibrous covering enclosing said tube, said
covering being connected with and carried by said pressure bar or device,
substantially as described.
7. In a paper making machine, a pressure bar, guard board, or device, provided
at one edge with a concave, combined with an inflated tube seated in said concave,
and a covering for said tube, substantially as described.
Dated the 91
1000
WM. BROOKES & SON,
55 and 56, Chancery Lane, London, Agents for the Applicant.