Improvements in Apparatus for Regulating the Supply of Pulp or Stuff to Paper Making Machines.
Year: 1886

page_text: Date of Application, 17th May, 1886.
Complete Left, 7th Feb., 1887.
Complete Accepted, 8th Mar., 1887.
Improvements in Apparatus for Regulating the Supply of Pulp or
Stuff to Paper Making Machines.
We, JAMES GERRARD DUNBAR, of Currie, Paper Mill Foreman, and ALEXANDER
MACKENZIE, of 28 Ivy Terrace, Edinburgh, both places being in the County of Mid
Lothian, North Britain, Bookkeeper, do hereby declare the nature of this Invention to
be as follows, that is to say :--
Our said Invention has for its object to secure a uniform density of the pulp or stuff
supplied to a paper making machine in order that the weight or substance of the
paper made on the machine may not vary.
In carrying out our Invention we use a subsidiary chest for the stuff, with an
agitator, and with a supply box fixed in a convenient position. In the supply box
there is a float of a conical or other suitable form which is connected to a valve and
opens or closes the valve more or less as it falls or rises with any variation in the
density of the pulp or stuff, and by causing the admission of more or less water
through the valve maintains the pulp or stuff of a practically uniform density. The
water may be spring water or pure water or it may be water from the size water box
which supplies the machine.
EDMUND HUNT,
Applicants' Agent.

page_text: Improvements in Apparatus for Regulating the Supply of Pulp or
Stuff to Paper Making Machines.
We, JAMES GERRARD DUNBAR, of Currie, Paper Mill Foreman, and ALEXANDER
MACKENZIE, of 28 Ivy Terrace, Edinburgh, both places being in the County of Mid
Lothian, North Britain, Bookkeeper, 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 followingstatement, that is to say :-
Our said Invention has for its object to secure a uniform density of the pulp or stuff
supplied to a paper making machine in order that the weight or substance of the
paper made on the machine may not vary.
In carrying out our Invention we use a subsidiary chest for the stuff, with an
agitator and with a supply box fixed in a convenient position. In the supply box
there is a float of a conical or other suitable form which is connected to a valve and
opens or closes the valve more or less as it falls or rises with any variation in the
density of the pulp or stuff, and by causing the admission of more or less water
through the valve maintains the pulp or stuff of a practically uniform density. The
water may be spring water or pure water or it may be water from the size water box
which supplies the machine.
And in order that our said Invention and the manner of performing the same may
be properly understood we hereunto append a sheet of explanatory drawings to be
hereinafter referred to and showing our improved apparatus.
Figures, 1, and 2, on the accompanying sheet of drawings are a plan and a sectional
elevation. In these drawings the same reference numerals are used to mark the same
or like parts whorover they are repeated.
The pulp or stuff passes from the machine chests, (not shown) by preference,
upwards through a pipe, 3, into an outer compartment, 4, of a supply box, made of
wood or other suitable material, and which is divided at the middle by a partition,
into two compartments, 4, 5, the partition having two ports or apertures at different
levels through which the stuff flows from the first into the second compartment, 5. In
the latter compartment, 5, a conical float, 6, of zinc, copper, or other suitable material
is free to float in the stuff. The float, 6, is made with a spindle, 7, passing through its
centre and it is kept in a vertical position by means of guides, 8, 9, through which the
spindle, 7, is passed. The top end of the spindle, 7, is fitted with an adjustable
finger, 10, so adjusted that when the float, 6, is floating in the stuff it just clears one
end of a bellerank lever, 11, which is free to oscillate on a fixed pin, 12, and is pro-
vided with balance weights, 13, to equalise the pressure on a valve, 14, fitted in a
valve box, 15. The valve, 14, is connected by suitable piping, 16, to the size
water tank of the machine (not shown) or to any other suitable source of water
supply and a small discharge pipe, 17, is fixed in the bottom of the valve box, 15.
The stuff passes from the supply box, 4, through the passages, 18, 19, to a mixing
;

page_text: chest, 20, fitted with an agitator and whenever it comes forward heavier than that
required for the weight of paper being made, the float, 6, rises and the finger, 10,
coming in contact with the lever, 11, allows an amount of water to fall into the valve
box, 15, from which it passes by the pipe, 17, to the mixing chest, 20, where it is
thoroughly mixed with the stuff which has already passed from the supply box, 4, by
the agitator which is driven by bevil gearing, 21. The stuff is then conducted to the
machine through the stuff cock, 22. The supply-box compartments, 4, 5, are made
with overflow openings, 23, 24, into a channel, 25, which conducts any excess of stuff
back to the machine chests.
Having now particularly described and ascertained the nature of our said Invention
and in what manner the same is to be performed, we declare that what we claim is :—
Apparatus for regulating the density of pulp, or stuff supplied to paper making
machines, the said apparatus comprising a float arranged to open a water-supply valve
more or less according to the density of the pulp or stuff and apparatus for mixing the
pulp or stuff and the added water substantially as hereinbefore described.
EDMUND HUNT,
Applicants' Agent.