Improvements in Dandy Rollers.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Dandy Rollers.
1, JULIUS POHLE of No. 1 Gartenstrasse of Raguhn in the Duchy of Anhalt,
Germany, Mannfacturer do hereby declare the nature of my said invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement:—
My invention relates to improvements in dandy rollers of paper making machines,
and has for its object to overcome certain difficulties arising with the common dandy
rollers by using a wire cloth or foundation of peculiar construction. The dandy rolls,
hitherto in practice with paper making machines had the inconvenience of being too
heavy for some kinds of paper, especially in case of considerable size and pressure,
and of becoming obstructed after some time of work, and did not allow to be perfectly
cleansed from the inside.
In order to carry out my invention into practice, flat or round wire throads are
interwoven with concave shaped wire threads to produce my improved wire cloth,
and in order to form the mantle of the dandy roll the wire cloth is laid around the
cylinder in such a manner, that the cavities of the hollow threads are turned to the
outside. Such arrangement is intended to allow a spiral wire to be wound around
the cylinder, whereby the spiral wire increases in the meantime the stability of the
dandy roller and serves as a holder for the fine brass wire gauze to be stretched upon
the whole.
In order to make my invention more clear, I refer to the accompanying drawing,
in which similar letters refer to similar parts throughout the different views and in
which:
Fig. 1 is a plan view of my improved wire cloth,
Fig. 2 is a longitudinal section through the same,
Fig. 3 shows the dandy roller provided with my new wire netting and the spiral
wound around it, and
Fig. 4 shows the cog wheel of common construction serving as gear for the
cylinder.
a are the threads of semi-circular section, b the abovementioned flat or round wire
threads;
when forming the cylinder the wire gaze is bent and connected in such a
way, that the hollow threads a constitute a continuous spiral, riz.: the end a¹ of the
first hollow thread a meets with the end of the second hollow thread, continuing
froin a to h³, a to h', a to h³, and so on.
is the spiral wire, wound through the hollow threads, as shown in Figs. 2
and 3.
g is a fine brass wire gauze lying perfectly free and presenting thus a large sucking
surface, as it is covered only at the points of contact with the spiral wire s. A dis-
location of the latter is perfectly prevented by the semi-circular or oval shape of the
threads a. The wire s may as well be soldered to the thread a.
d is a spur-wheel of any description, fastened to the axle of the drum by
bolt e.
The roller may easily be formed in any size, and if made of a larger diameter than
usual, it has the advantage that the envelope may longer be in use, and that the seam
is not often seen on the paper.
Instead of the hollow wire a I may also use double wire.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
1. In dandy rollers of paper making machines, a wire cloth consisting of flat or

page_text: round wire threads & an 1 wire threads a, forming spiral grooves in combination with
a wire spiral, being wound round the roller in the continuous spiral groove formold by
the wires a, for the purpose as described.
2. In dandy rollers of paper making machines, a wire cloth consisting of flat or
round wire threads and hollowed wire threads a forming spiral grooves in com-
bination with a wire spiral, being wound round the roller in the continuous spiral|
groove formed by the hollow wires a, for the purpose as described.
Bind ... al. . 1000
JULIUS POHLE.
By Rayner & Cassell,
37, Chancery Lane, London, W.C., Agents for the Applicant.