IMPROVEMENTS IN MEANS OF AND APPARATUS FOR REFINING AND STRAINING PULP IN THE MANUFACTURE OF PAPER.” SP
Year: 1880

page_text: LETTERS PATENT to George Tidcombe, senior, and George Tidcombe, junior,
both of Watford, in the County of Hertford, Paper Makers' Engineers, for an
Invention of "IMPROVEMENTS IN MEANS OF AND APPARATUS FOR REFINING
AND STRAINING PULP IN THE MANUFACTURE OF PAPER.”
PROVISIONAL SPECIFICATION left by the said George Tidcombe, senior,
and George Tidcombe, junior, at the Office of the Commissioners of Patents
on the 2nd December 1880.
GEORGE TIDCOMBE, senior, and GEORGE TIDCOMBE, junior, both of Watford, in
the County of Hertford, Paper Makers' Engineers. "IMPROVEMENTS IN MEANS
OF AND APPARATUS FOR REFINING AND STRAINING PULP IN THE MANUFACTURE
OF PAPER."
This Invention relates firstly to means of constructing rollers for refining and
straining pulp in pulping engines so that the bars of the rollers will be equidistant,
or nearly so, and also to certain improvements upon the subject matter of prior
Letters Patent, dated 13th Decr. 1879, No. 5108, granted to one of the present
applicants, the said George Tidcombe, junior.
Firstly. In carrying this part of the Invention into practice, for the making
of the refining or grinding faceted teeth strainer rollers described in the Specification
of the said Letters Patent before referred to, we make up the body of the rolls by
casting therein dividing plates of hardened metal set radially in the casting of the
roll body, and fill in between the said radial bars with suitable filling, such as plates
of metal and papier maché, or cardboard fillings and wooden wedge blocks, and
then clear away the said fillings sufficiently for forming the requisite dwells between
the radial bars which will form the grinding molar teeth or working facets of the
refining or grinding strainer rollers, as described in the said Patent.
Again, in making an ordinary rag engine or pulping roll, we make up the body
of the roller by casting therein dividing plates of wrought or malleable iron, or
suitable steel, equidistant or nearly so around its circumference, so as to form a
skeleton body for building up the roll between the plates whereof the bearing bars
ID C31

page_text: and fillets are fitted and wedged against each, and may be held together by
a metal ring at each end in the usual manner; or (2), we cast the roller itself of
malleable or suitable metal, having equidistant dividing plates forming part of the
same casting, thick enough in relation to the general section of the casting not
to break as the casting cools or the roller is being fitted up, and thin enough that
the pulping bars may be equidistant and closer together than heretofore.
In the forming of rollers as shown in Fig. 4 of the Specification of the aforesaid
Letters Patent, which is in effect a running rotary strainer, we construct such
rollers of emery or hard stone, or suitable composite material possessing in texture
a grip or "tooth," and turn them truly enough by runners or grinding wheels of
harder substance running at higher speed than the roller that is being turned, so as
to get each roller true in its main diameter and secure the necessary grinding or
rasping effect upon the pulp to draw out the fibres instead of crushing them into
wafers, as would be done by plain rollers without such dwells or " tooth
surfaces; and two of these rollers are run together at varying speed, or it may be
at equal speeds, in the same or contrary direction for the purpose of grinding,
refining, or straining diluted pulp between them ready for the paper making
machine. Such rollers when so used are hoppered and packed in airtight box so as
that the pulp to be treated may be supplied from a "head"
or under air pressure,
"
and so be treated on its passage between the peripheries of the rolls.
"
We make a bed plate or bottom plate of the same material as the above for the
above purpose, to be used with one of the rollers running against or near the same,
of a plain or curved form, or with dwells, according to the said former Patent.
"
Secondly. The second part of this Invention relates to means for the more
effectual straining of pulp in strainers that have heretofore been known as
Ibotson's," as well as "Easton and Amos's strainers." By these strainers the
overflowing pulp has been passed through one or more holes or outlets without
causing an even cleansing of the strainer plates by the flow of the stuff over them,
and the suction action of such strainers has been made by a jog or excentric motion
causing offensive noise, as well as inconvenience. Our present Invention obviates
these and other defects by the peculiar construction and adaptation of an adjustable
dam or gate to the surface of the strainer plates, and of an india rubber or elastic
diaphragm to the bottom of the strainer having a peculiar double action adjustable
and noiseless shake motion attached to the same, and the strainer is made without
a vat, so as to cleanse same with greater facility than heretofore.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Tidcombe, st., and George Tidcombe, jr., in the Great Seal
Patent Office on the 2nd June 1881.
GEORGE TIDCOMBE, senior, and GEORGE TIDCOMBE, junior, both of Watford, in
the County of Hertford, Paper Makers' Engineers. "IMPROVEMENTS IN MEANS OF
AND APPARATUS FOR REFINING AND STRAINING PULP IN THE MANUFACTURE of
PAPER."
This Invention relates, firstly, to means of constructing rollers for refining and
straining pulp in pulping engines so that the bars of the rollers will be equidistant,
or nearly so, and also to certain improvements upon the subject matter of prior
Letters Patent, dated 13th of December 1879, No. 5108, granted to one of the
present applicants, the said George Tidcombe, junior.
Firstly. In carrying this part of the Invention into practice,
For the making of the refining or grinding faceted teeth strainer rollers described
in the Specification of the said Letters Patent above referred to, we make up the
body of the rolls by casting therein dividing plates of hardened metal set radially
in the casting of the roll body and fill in between the said radial bars with suitable
filling, such as plates of metal and papier maché, or cardboard filling and wooden
wedge blocks, and then clear away the said fillings sufficiently for forming the
requisite dwells between the radial bars which will form the grinding molar teeth
or working facets of the refining or grinding strainer rollers, as described in the
said Patent, or said molar teeth or working facets are provided in the fillings.
Again, in making an ordinary rag engine or pulping roll we make up the body
of the roller by casting therein dividing plates of wrought or malleable iron or
suitable steel, equidistant or nearly so around its circumference, so as to form a
skeleton body for building up the roll between the plates, whereof the wearing bars
and fillets are fitted and wedged against each other, and may be held together by a
metal ring at each end in the usual manner; or (2) we cast the roller itself of
malleable or suitable metal having equidistant dividing plates forming part of the
same casting thick enough in relation to the general section of the casting not to
break as the casting cools or the roller is being fitted up, and thin enough that the
pulping bars may be equidistant and closer together than heretofore.
In the forming of rollers, as shown in Fig. 4 of the Specification of the aforesaid
Letters Patent, which is in effect a running rotary grinding strainer, we construct
such rollers of emery or hard stone or suitable composite material possessing in
texture a grip or "tooth," and turn them truly enough by runners or grinding
wheels of harder substance running at higher speed than the roller that is being
turned, so as to get each roller true in its main diameter, but giving the necessary
grinding or rasping effect upon the pulp to draw out the fibres instead of crushing
them into wafers, as would be done by plain rollers without such grip or "tooth
surfaces, and two of these rollers are run together at varying speeds, or it may be
at equal speeds in the same or contrary direction for the purpose of grinding,
refining, or straining diluted pulp between them ready for the paper making
machine. Such rollers when so used are hoppered and packed in water tight box, so
"head or under air
as that the pulp to be treated may be supplied from a
pressure, and so be treated on its passage between the peripheries of the rolls.
We make a bed plate or bottom plate of the same material for the above purpose
to be used with one of the rollers running against or near the same of a plain or
curved form or with dwells therein according to the said former Patent.
Secondly. The second part of this Invention relates to means for the more
effectual straining of pulp in strainers that have heretofore been known as
"Ibotson's" as well as "Amos and Clark's" strainers.

page_text: By these strainers the overflowing pulp has been passed through one or more
holes or outlets without causing an even cleansing of the strainer plates by the flow
of the stuff over them, and the suction action of such strainers has been made by a
jog or eccentric motion, causing offensive noise as well as inconvenience.
Our present Invention obviates these and other defects by the peculiar
construction and adaptation of adjustable dam or dams or gate or gates to the
surface of the strainer plates, and of an india rubber or elastic diaphragm to the
bottom of the strainer having a peculiar double action adjustable and noiseless
shake motion attached to the same, and the strainer is made without a vat so as to
cleanse same with greater facility than heretofore.
In the accompanying 2 Sheets of Drawings, Fig. 1 represents in sectional end
view the skeleton of the roll body constructed according to this Invention for
preparing the pulp for the strainer machines.
Fig. 2, in like view the roll fitted as a rag engine or pulping roll.
Fig. 3, the fitting for pulp grinder or strainer roll.
Fig. 4, modification of the fitting shown in Fig. 3.
Fig. 5 is a front view of the improved strainer machine fitted according to this
Invention.
Fig. 6 is an end view.
"
Figs. 7, 8, 9, and 10 are diagrams of strainer plate surfaces for fitting straining
machines with the adjustable dam or gate.
"
Referring to Figs. 1 to 4, Sheet 1, A are the partitions or dividing plates of
metal" cast or set radially in the casting B of the roll body; C is the boring in
end plates of roll for receiving the spindle; Fig. 1 shows the skeleton roll body,
and Fig. 2 the same fitted as a rag engine or pumping roll; C are the wearing or
pulping bars, and D the fillets for wedging the bars C between the partitions A,
which construction allows of a great number of steel bars C being used in any
given diameter of roll, and provide for convenient and firm wedging and
fitting.
In Fig. 3, the plates A, themselves of hardened steel, are used thicker, and their
ends will act as the grinding facets or molar teeth of the roll with the dwells E
between them, as in the Specification of the Patent before referred to.
Fig. 4 represents a similar construction of this kind of roll, but the plates A are
of lighter size and the bars F form the facets or molar teeth with the dwells E
between them. These bars F may be in this case either chilled iron, hardened
steel, or emery plates, and this modification of construction allows of the actual
wearing facets F being renewed from time to time without wearing away the body
of the roll.
The ends of the rolls will, when fitted as described, have a groove turned in the
ends thereof, wherein a ring key piece G is laid and secured so as to bind the
fillings and bars in position and hold same to body of the roll.
The pulp after preparation is passed to the strainers, and our improvements are
represented in Sheet 2 of the Drawings; H are the strainer plates, which are set
in a hinged frame or box I, hinged at K, and the gate, dam, or valve, for allowing
of the overflowing pulp from the strainer plates to escape as required is or are
placed at L, whereby an even cleansing of the strainer plates H is effected, as the
gates or valves L may be raised as required. In Fig. 7 the gate extends across
the whole width of the strainer machines, but in some cases this would allow of too
great a rush of stuff and too large an overflow, so we employ inclines M to the lips
of the overflow gates L, so that the force of the rush of overflow can by the gates
be regulated to a nicety.
The strainer is made without a vat, and is mounted upon hinge K for cleansing
same or replacement of other strainers. To the machines so fitted is furnished an
overflow channel N to an auxiliary strainer, such overflow of unstrained pulp or
knots being received therein for further treatment. O is an india rubber diaphragm,
on to which the strained pulp is received and is discharged by pipe P to the paper
machine.

page_text: The shake motion is of double action, is adjustable, and noiseless, the part Q
whereof terminates in a central piece R rounded to fit in the cup S, which is
supported by the rounded part T, taking into cup S₁, supported by the rounded
shank U, taking into cup S2, the shank whereof has a rounded part V taking into
cup S3, and a cross arm W is driven by an eccentric worked by some rotary portion
of the motor engine to give the shake motion to the parts.
The cups S, S', S2, S3, receive lubricant and effect the noiseless shake motion
through the excentric shaft W.
Having now described the nature and particulars of the said Invention in such
wise that the same may be carried into practical effect, we claim,-
Firstly. The formation of the pulping or grinding roll with the partition bars A
of wrought or malleable iron or of steel cast in the beater or grinder roll body B,
as and for the purposes described and shown in Figs. 1 and 2 and 3 and 4 of the
Drawings.
Secondly. The grinding rollers for grinding or straining pulp, made of material
having a grip or "tooth" on its surface, as herein described, and the running
of such rollers at varying speeds in connection with each other, as herein set
forth.
Thirdly. The gate or valve L across the flow of the pulp and the surface of the
strainer plates H, as and for the purpose herein specified and shown in Figs. 5 to 10
of the Drawings.
Fourthly. The inclines M of the strainers or lips of the same with the valve or
valves L, for the purposes described and shown in Figs. 8, 9, and 10 of the
Drawings.
Fifthly. The mode of turning up this strainer on the hinge K without a vat, or
instead of lifting it out of a vat, as and for the purpose set forth, with or without
the auxiliary overflow channel to an auxiliary strainer, as is specified.
Sixthly. The knuckle joint shake motion having lubricating cups or hollows at
the top of each, for the purposes described and as specified.
In witness whereof, the said George Tidcombe, senior, and George
Tidcombe, junior, bave hereunto set their hands and seals, this Thirty first
day of May, One thousand eight hundred and eighty one.
ANADAR MIKOA Y DR
In presence of
WALTER A. BARLOW,
Patent Agent & Engineer,
6, St. Paul's Chyard.,
London, E.C.
ODE.
(1.5.)
GEORGE TIDCOMBE, JNR. (L.S.)