Improvements in Apparatus for Straining and Cleansing Fibrous Pulp for Paper Making.
Year: 1897

page_text: Date of Application, 5th June, 1897-Accepted, 21st Aug., 1897
COMPLETE SPECIFICATION.
Improvements in Apparatus for Straining and Cleansing Fibrous
Pulp for Paper Making.
I, GORDON RENNIE of 9 Grange Loan Edinburgh, in the County of Midlothian,
North Britain, Mechanical Draughtsinan, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :—
My said invention consists of certain improvements in design and form of construc-
tion in apparatus for straining and cleansing any kind of fibrous pulp, used for paper.
making.
The invention will be well understood. by reference to the accompanying Sheets of
Drawings, in which Figure 1 is an Elevation, Figure 2 a plan thereof; and Figure 3,
a partial Transverse Soction.
A, is a circular vat supported at a suitable height from the sole plate L by four
vertical frames K; and is securely fixed to a solid foundation by four or more holding
down bolts S¹.
The circular vat A can be comprised all in one or in two parts, as will be seen, being
jointed together with bolts, the top or upper portion projecting in and over the bottom
or under portion; thereby providing the hollowed out recess H with an inlet suitable
for it, and making the inside diameter of the said circular vat A just to clear the out-
side diameter of the circular standing plate B. The said recess H is for containing
the refuse; and takes its form from the outside circumference of the said circular
straining plate B.
The horizontal circular straining plate B, which may be any desired grade of conoidal
form, is so applied as to form a horizontal joint and bearing on its working face B¹
inside of the circular vat A; also making a division of the fibrous pulp between its
inside and outside surface, and which can be made all in one piece, or in segments,
by their being securely jointed together, and has slits over its surface cut through it to
any gauge desired, through which the fibrous pulp flows continuously by the straining
action of the diaphragm C, which is connected by the rod D from the guide rod
to the adjustable disc or crank plate E, which regulates the upward and downward
movement of the said diaphragm, and is fixed on the driving shaft F which is carried
up from the sole plate L, by two bearing brackets L', and driven by the pulley G, at a
velocity of 500 revolutions per minute or thereby.
The purpose of the horizontal circular straining plate B having a conoidal form is
chiefly to create or cause a gradual and constant flow of the refuse from the centre alt
over its inclined surface towards the said recess H; simultaneous with the flow of the
strained fibrous pulp passing through the said slits, whilst being subjected to the suction
and straining action of the diaphragın C which is worked by one connecting rod only;
thus simplifying the adjustment for regulating the said straining notion. Whereby in a
minimum of time the maximum quantity of strained and cleansed fibrous pulp passes
through the said slits. Reducing the driving power also to a minimum.
The diaphragm C has the same degree of conoidal form as the circular straining
plate B; by which it gives an equal suction from its centre all round towards the out--
Bide circumference. To give the diaphragm C a true vertical motion, there is fixed

page_text: to it the supporting guide rod I, which has for its main steadying guide at the bottom,
the main guide bearing bracket J fixed to the standard frames K which are fixed to
the sole plate L. Whereas at the top the said guide rod I being extended passes up
through the centre of the circular straining plate B, which also gives a steadying guide
bearing for the diaphragm C; thus obviating as far as possible the wear and strain
on the flexible joint M. The detachable packing gland bush N, made to receive it,
being screwed and fitted in tight into the circular straining plate B.
providing a true, central, top and bottom guide bearing for the said diaphragm.
Thereby
To allow for the straining action of diaphragm C and also for connecting it to the
circular vat A, the india rubber flange or flexible joint M is held in position for this
purpose by the two flanges 0. 0. This india rubber or flexible joint being made
circular to suit the bottom of the diaphragmn and the circular vat, and with a suffi-
cient rigidity serves as a cushion to counteract the return motion of the said
diaphragm.
The worm P on the driving shaft F drives the worm wheel Q, which may be thrown
in or out of gear by the sliding clutch Q', and is fixed on the vertical shaft R which is
Bupported at the bottom by the footstep bracket S, and at the top by the support
bearing bracket T fixed to the vat A. This vertical shaft R also carries the crank disc U
which gives a continuous to and fro horizontal movement to the circular straining
plate B, by the rod V connecting the said crank disc to the projecting lever bracket W,
which is fixed to the said straining plate by the two upright studs X. X. and of a
sufficient height to make the connecting rod V, clear the top of the circular vat A.
To keep the joint secure between the horizontal circular straining plate B and its
working face B', four or more vertically adjustable lugs or pads Y are fixed in a
suitable position on the inside of the circular rat A, which are adjusted to a nicety by :
means of threaded rods and jau nuts or equivalent devices, so that the said lugs or
pads will just clear the upper surface of the said circular 'straining plate. Thus
allowing for the horizontal circular movement, at a speed of 75 feet per minute or
thereby, but if desirous a greatly diminished speed can be obtained by duplicate
gearing. The working face B' may be faced or lined with a special metal, hard wood,
or other material suitable for the purpose; which may be renewed when necessary.
The chief. purposes of the continuous or to and fro horizontal movement of the
circular straining plate B are:-
Firstly. To agitate the flow of the pulp over the whole surface of the plate.
Secondly. That it will be self cleansing on the outside and inside surface.
Thirdly. To prevent the straining through the said slits or the flow of the pulp
from the inlet I giving the plate an unequal wear on the surface.
Fourthly. That none of the pulp may flow over the surface without being subjected
to the straining action of the diaphragmn C.
The flow caused by the conoidal form of the said straining plate, deposits into the
recess H what does not pass through the said slits, from whence it is discharged by
the auxiliary outlet Z. The strained pulp which passes through the said slits is
discharged by the outlet Z, to which is connected a service box, to regulate the flow
of the pulp on to the paper making machine.
There is formed in the circular vat A the overflow outlet O'.
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 :-
Firstly. The circular vat, in its completed form as shown in Figures 1, 2 and 3 of 6
the annexed drawings for the purposes set forth.
Secondly. The combination of the hollowed out recess and its inlet shown in
Figure 3 of the annexed drawings for the purposes as set forth.
Thirdly. The extended vertical guide rod bearing for diaphragm shown in Figure 3
of the annexed drawings for the purposes as set forth.
Fourthly. The continuous or to and fro horizontal movement of circular straining
plates, for the purposes set forth.
6

page_text: Fifthly. The apparatus in its complete form as in Figures 1, 2 and 3 of the
drawings annexed for the purposes set forth.
Sixthly, and lastly. I claim the employment of conoidal and horizontal circular
straining plates and diaphragms, with or without any grade of conoidal form in, on, or
to apparatus or machines, in or by which any description of fibrous pulp used for
paper making is strained and cleansed, and whether such conoidal and horizontal
circular straining plates and diaphragme be arranged in the manner shown, or in any
other way, substantially as set forth.