IMPROVEMENTS IN DANDY ROLLERS' FOR PAPER MACHINES."
Year: 1880

page_text: LETTERS PATENT to William Green, of Camberwell, in the County of Surrey,
Manufacturer, for an Invention of "IMPROVEMENTS IN DANDY ROLLERS'
FOR PAPER MACHINES."
PROVISIONAL SPECIFICATION left by the said William Green at the
Office of the Commissioners of Patents on the 2nd September 1880.
WILLIAM GREEN, of Camberwell, in the County of Surrey, Manufacturer.
"IMPROVEMENTS IN DANDY ROLLERS' FOR PAPER MACHINES."
'
My Invention relates to those rollers used in paper machines for the purpose of
water marking, which are known as "dandy rollers," and is designed to obviate by
its improved form the disadvantages attending the present form of roller.
Whereas the dandy rollers at present in use allow the pulp to collect in the
interstices of the wove or laid wire upon the roller without any means of cleansing
same, causing rapid wearing and corrosion, and moreover eventually producing
paper of a cloudy and inferior character, I, by the form of my improved roller,
allow it to be continually cleansed by a flow of water through the upper travel,
and thus obviate the aforesaid defects in the present rollers.
My improved roller is fixed on two ends which form journals outside and within
the roller ends. Upon the inner journals is suspended a trough, preferably higher
at the centre than at the ends. The terminations of the trough are open to allow
the discharge of the water from the open ends of the roller.
The roller in place of being constructed upon several frame wheels with spokes
radiating from a through shaft, is now formed upon two strong frame wheels at
each end, and a number of rings without spokes. The whole roller is made rigid
by light rods fixed in the frame wheels at each end, and passing through holes
pierced through the inner rings.
The action of my improved roller is, that a constant flow of water from any
convenient source is directed upon the roller. This flow of water cleanses the
interstices from all adherent pulp, and runs away through the open ends of the
roller without dropping upon the pulp passing underneath.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Green in the Great Seal Patent Office on the 28th
February 1881.
WILLIAM GREEN, of Camberwell, in the County of Surrey, Manufacturer.
"IMPROVEMENTS IN DANDY ROLLERS' FOR PAPER MACHINES."
My Invention relates to those rollers used in paper machines for the purpose of
water marking, which are known as "dandy rollers," and is designed to obviate by
its improved form the disadvantages attending the present form of roller.
Whereas the dandy rollers at present in use allow the pulp to collect in the
interstices of the wove or laid wire upon the roller without any means of cleansing
same, causing rapid wearing and corrosion, and moreover eventually producing
paper of a cloudy and inferior character, I, by the form of my improved roller,
allow it to be continually cleansed by a flow of water and steam if desired, through
the upper travel, and thus obviate the aforesaid defects in the present rollers.
My improved roller is fixed on two ends which form journals outside and within
the roller ends. Upon the inner journals is suspended a trough, preferably higher
at the centre than at the ends. The terminations of the trough are open to allow
the discharge of the water from the open ends of the roller.
The roller in place of being constructed upon several frame wheels with spokes
radiating from a through shaft, is now formed upon two strong frame wheels at s
each end, and a number of rings without spokes. The whole roller is made rigid
by light rods, preferably rectangular, and arranged radially fixed in the frame
wheels at each end, and passing through holes pierced through the inner rings.
In the case of wove rollers I prefer however to pierce the longitudinal rods, and
pass the wires through them, thus dispensing with the longitudinal laid backing
now in use,
The action of my improved roller is, that a constant flow of water from any
convenient source, and of steam if so desired, is directed upon the roller. This flow
of water, or of water and steam, cleanses the interstices from all adherent pulp, and
runs away through the open ends of the roller without dropping upon the pulp
passing underneath.
•
In order that my Invention may be the better understood, I now proceed to
describe the Drawings hereunto annexed, reference being had to the Figures and
letters marked thereon.
Like letters refer to like parts in each of the Figures.
Figures I. and II. are respectively longitudinal and transverse sections through
my improved dandy roller.
Figure III. is the hanging trough.
A is the mesh or wire; B are two strong frame wheels at the ends of the roller;
and D are rings. Upon these frame wheels and rings the wire forming the surface
of the roller is fixed; E are light longitudinal rods or bars, preferably rectangular,
and arranged radially, attaching the frame wheels B and the rings D, and thus
making the whole rigid. C are the inner journals in the centre of the end frame
wheels, and from these is suspended the trough F by the bearings G. The outer
journals are those on which the roller turns as at present. The trough F is shown
in detail in Figure III. highest at the centro; H is a pipe perforated with small
holes to deliver a flow of water.
When the dandy roller is in operation, a flow of water from the perforated
pipe H, or in other convenient manner, is made to flow on to the upper travel of
the roller, and in some cases I also add a jet of steam, conveniently from a similar
pipe in front of the water pipe, to facilitate the passage of the water through the

page_text: interstices of the mesh. The water thus continually passing through the mesh in
its upper travel, washes from it all adherent pulp, and preserves the surface always
clean for contact with the pulp in the under travel. The water is prevented from
falling on to the under travel of the roller by the suspended trough F, which catches
it in its fall from the upper travel, and sheds it clear of the pulp through the frame
wheels B at each end. This shedding is facilitated by the construction of the
trough, as shown in Figure III., highest in the centre.
And having now fully described and ascertained the nature and object of my
Invention, and the manner in which it is to be performed, be it known that what
I consider novel and useful, and desire to protect by my Letters Patent is,-
The construction of an improved dandy roller with open ends, suspended trough,
and a flow of water through the upper travel, and without inner radial spokes or
through shaft, substantially as and for the purposes herein before specified.
In witness whereof, I, the said William Green, have hereunto set my hand
and seal, this Twenty sixth day of February, in the year of our Lord One
thousand eight hundred and eighty one.
n the presence of
S. P. WILDING,
23, Rood Lane,
London, E.C.,
Patent Agent.
WILLIAM GREEN. (L.S.)