Improvements in the Construction of Dandy-rolls for Paper-making Machinery.
Year: 1894

page_text: Date of Application, 18th Sept., 1894
Complete Specification Left, 17th July, 1895-Accepted, 17th Aug., 1895
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Dandy-rolls for Paper-making
Machinery.
We, THOMAS ALLEN MARSHALL, and CHARLES DUDLEY MARSHALL, both of
Campbell Works, Stoke Newington, in the County of Middlesex, Dandy-roll
Manufacturers do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the construction of the internal frame-
work of dandy-rolls employed in machines for the manufacture of paper for the
purpose of imparting to the paper when in the state of pulp the various marks, such
for example as what are known as wove," "laid," lines," water-marks" and the
like; and the principal object of our invention is to produce dandy-rolls which
shall have the maximum of strength and rigidity with the minimum of weight and
material.
<
According to our invention we preferably dispense with the central shaft or tube
from end to end of the roll, and also the supporting discs or rings as usually
employed, and we construct the framework of our improved roll in the following
manner.
Around the circumferential surface of a suitable mandril we lay moderately
strong wires or rods longitudinally and at a convenient distance apart, or in the form of
what is known in the trade as "backing sheet." Over these longitudinal wires or rods,
and helically around and along the periphery of the roll, we lay one or more wires
preferably of a finer gauge, and fixed at each end, and also to the longitudinal
wires, by soldering, brazing or notching in a manner well understood in connection
with the manufacture of dandy-rolls.
We then lay another series of longitudinal wires or rods (preferably of lighter
section and finer pitch) on the helical coil just referred to, and similarly attach
them to the said coil. We then lay a helical coil over these longitudinal wires or
rods, similar to the first-named coil, but preferably of finer gauge, and wound the
reverse hand, for example, if the first helical coil is right-handed the second should
be left-handed, and vice versa. This second helix may also be attached to the
longitudinal wires or rods on which it lies, and the frame-work thus constructed
may now be removed from the mandril, and mounted in suitable end-plates, and
gudgeons, or on a tube or shaft running from end to end of the roll in the usual
manner, and may be finished in any desired or well known manner, according to the
description of paper in the manufacture of which it is to be employed.
In some cases we dispense with the first-named longitudinal wires or rods, or
"backing-sheet," and we wind the first named helix on to the mandril direct. The
wires or rods may be of any suitable section, and instead of wires or rods, we
sometimes employ tubes.
In order that the pitch of the right and left handed helices hereinbefore referred
to may be quick or steep we prefer to use two or more wires thus forming each
helix of two, three, or more threads.
Sometimes, more especially in the case of "laid rolls," instead of the outer helix,
we employ separate rings formed of any suitable section of wire, preferably
triangular, and mounted on the layer of outer longitudinal wires or rods, thus
forming a convenient base to which the twists or chain-wires of the "laid "cover
may be attached by sewing or otherwise.

page_text: Sometimes, more especially in the case of "wove" rolls, we prefer to form the
base of the "wove" cover by brazing or otherwise securing to the before mentioned
double helix a thin sheet or cylinder of perforated brass, copper, or other suitable
metal.
DL
101 1
1004
T. A. MARSHALL,
C. D. MARSHALL,
Per W. H. Beck,
115 Cannon Street, London, Agent.
Improvements in the Construction of Dandy-rolls for Paper-making
Machinery.
We, THOMAS ALLEN MARSHALL, and CHARLES DUDLEY MARSHALL, both of
Campbell Works, Stoke Newington in the County of Middlesex, Dandy-roll
Manufacturers, do hereby declare the nature of this invention, and in what manner 1
the same is to be performed, to be particularly described and ascertained in and by
the following statement :-
This invention relates to improvements in the construction of the internal frame-
work of dandy-rolls employed in machines for the manufacture of paper for the
purpose of imparting to the paper when in the state of pulp the various marks, such
for example as what are known as "wove," "laid," "lines," "water-marks," and the
like; and the principal object of our invention is to produce dandy-rolls which
shall have the maximum of strength and rigidity with the minimum of weight and
material.
According to our invention we preferably dispense with the central shaft or tube
from end to end of the roll, and also the supporting discs or rings as usually
employed, and we construct the framework of our improved roll in the manner
illustrated in the accompanying sheet of drawings in which
Figure 1 shews a portion of a dandy-roll partly in longitudinal section (from a to b),
partly in elevation (from 6 to c), and partly in various stages of construction
(from e to d, d to e, and e to f').
Figure 2 is a partial end elevation,
Figure 3 illustrates a modification to be hereinafter described.
Around the circumferential surface of a suitable mandril (not shown in the
drawings) we lay moderately strong wires or rods A in a longitudinal direction as
shewn and at a convenient distance apart.
Over these longitudinal wires or rods, and helically around and along the
periphery of the roll, we lay one or more wires B, B' preferably of a finer gauge,
and fixed to the longitudinal wires A at the points where they cross the same by
soldering, brazing, or notching, in a manner well understood in connection with the
manufacture of dandy-rolls. We then lay another series of longitudinal wires or
rods C (preferably of lighter section and finer pitch than the wires A,) on the
helical coil or coils B, B, and similarly attach them to the said coil or coils B, B¹.
We then lay a helical coil or coils D, D' over the longitudinal wires or rods C
similar to the first named coil or coils B, B¹ but preferably of a finer gauge aud
wound the reverse hand, for example if the helical coil or coils B, B' be left-handed
as shewn, the helical coil or coils D, D' should be right-handed as shewn, and vice
versa. The helical coil or coils D, D' may also be attached to the longitudinal
wires or rods C, and the framework thus constructed may now be removed from.
the mandril, and mounted on suitable end plates as at E provided with gudgeons or
journals F, or if preferred on a tube or shaft running from end to end of the roll in
the usual manner, and may be finished in any desired or well-known manner

page_text: according to the description of paper in the manufacture of which it is to be
employed.
In some cases we dispense with the longitudinal wires or rods A, and we wind
the inner helical coil or coils B, B' on to the mandril direct. The wires or
rods A, B, B, C, D, D¹, may be of any suitable section and instead of wires or
rods we sometimes employ tubes.
If desired and in order that the pitch of the helical coils B, B' or D, D' may be
quick or steep more than two wires may be used and the helices be thus formed of
three, four, or more threads.
"
Sometimes, more especially in the case of "laid" rolls instead of the outer
helix D, D', we employ separate rings formed of any suitable section and mounted
on the outer series of longitudinal wires or rods C, thus forming a convenient base
to which the twists or chain-wires of the "laid cover may be attached by sewing
or otherwise. In Figure 3 these rings are shewn of two sections, the ring D² being
formed of two circles of round wire, one inside the other, attached together by
brazing or soldering, and the ring D³ being formed of a single circle of wire of
triangular section as shewn.
Sometimes, more especially in the case of "wove" rolls, we prefer to form the
base of the "wove" cover by brazing or otherwise securing to the outer helix D, D'
a thin
eet or cylinder of perforated brass, copper, or other suitable metal (not
shewn the drawings).
We a
0
aware that dandy-rolls have been heretofore constructed without a
centra naft or tube, but such dandy-rolls have been weak and untrue, and have
been easily damaged in handling and in removal from place to place. They have
also been very difficult to repair when ouce damaged, and so far as we are aware
such dandy-rolls have, for the reasons above stated, proved unsatisfactory. Dandy-
rolls constructed in accordance with our invention are extremely light but of
considerable strength and rigidity, and they can therefore be handled and transported
from place to place with ease and safety. They also retain their cylindrical shape,
and run perfectly true.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
:-
First. In a dandy-roll the combination of longitudinal wires A, a helical coil or
coils B, B', longitudinal wires C, and a helical coil or coils D, D¹, substantially as
described.
Second. In a dandy-roll the combination of a helical coil or coils B, B', longi-
tudinal wires, C, and a helical coil or coils D, D', substantially as described.
Third. In a dandy-roll, the combination of longitudinal wires A, a helical coil
or coils B, B, longitudinal wires C, and rings D or D³, substantially as described.
Fourth. In a dandy-roll, the combination of a helical coil or coils B, B¹, longi-
tudinal wires C, and rings D2 or D³, substantially as described.
Fifth. In a dandy-roll constructed according to either of the first four claiming
clauses hereof the employment of a thin sheet or cylinder of perforated brass,
copper, or other suitable metal as a base for the "wove" or other cover substantially
as described.
Sixth. A dandy-roll constructed substantially as described.
Dated this 17th day of July 1895.
T. A. MARSHALL,
C. D. MARSHALL,
Per W. H. Beck,
115 Cannon Street, London, E.C., Agent.