Improvements in and relating to Rotary Strainers for Use in Paper-making.
Year: 1894

page_text: Date of Application, 28th Dec., 1894
Complete Specification Left, 4th May, 1895-Accepted, 15th June, 1895
PROVISIONAL SPECIFICATION.
Improvements in and relating to Rotary Strainers for Use in
Paper-making.
I CHRISTIAN WANDEL of Reutlingen in the Kingdom of Wurttemberg German
Empire Manufacturer, do hereby declare the nature of this invention to be as
follows
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This invention relates in general to rotary stramers used in the manufacture of
paper for fiecing the pulp from knots and in particular to that class of otary
strainers in which the cylinder receiving the pulp and separating the knots from
the same is subjected to shock while being rotated.
The objects of this invention are first to prevent the occurrence of undue shocks
in the gearing between the cylinder and the main shaft and secondly to reduce the
wear and tear of the gearing.
Now according to this invention I attach to the cylinder or to the tranmion
thereof a worm wheel with crown teeth which wheel gears with a worm carried by
a short shaft geared by means of bevil wheels to the main shaft of the machine.
The cylinder is provided with trunnions rotating in bearings attached to or
formed integral with oscillating levers pivoted at one end to the frame of the
machine their free ends testing on cams secured to the main shaft.
I prefer to attach the worm wheel outside the bearing as by this arrangement the
stain on the levers is equalised.
As the cylinder 10tates it is alternately lifted and dropped by the cams these two
motions taking place simultaneously with the 1otation and independently thereof
the crown teeth of the worm wheel allowing the cylinder to rise and fall easily
without causing undue shocks in the gearing.
Dated this 28th day of December 1894.
T. E HALFORD,
11, Furnival Street, London, Agent for Applicant.
Improvements in and relating to Rotary Strainers for Use in
Paper-making.
I CHRISTAIN WANDEL, of Reutlingen in the Kingdom of Wurttemberg Gerinan
Empire, Manufacturer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:—
This invention refers in general to rotary strainers, as used in the manufacture of
paper for freeing the pulp from knots and in particular to that class of 1otary
strainers, in which the cylinder receiving the pulp and separating the knots from
the same, is subjected to shocks while being rotated. My improvements in 1otary
strainers of the sand kind consist in finishing the rotary cylinder, or the hollow
neck on necks of the same respectively, with a worm-wheel having crown teeth and
fmther in combining with said crown-wheel a worm adapted to transmit the motion
of the main shaft to said cylinder in every position of the latter.

page_text: The objects of my improvements are first to prevent the occurrence of undue
shocks in the gearing between the cylinder and the main shaft, and second to
prevent the said geating from becoming unduly worn.
-
I attain the said two purposes, as well as some other advantages later on
mentioned by the construction shown au the accompanying diawings, in which
Fig 1 is plan partly in section of an apparatus constructed according to this
invention Fig 2 is end view also in section of same.
The same letters denote the same parts in both figs
a is the rotary cylinder or strainei proper provided with hollow trunnions al a³
supported in bearings attached to or forming part of levers c c¹ pivoted at c to
the framed the free ends of the said levels resting upon cams e fixed to the main
shaft f.
The trunnion a of the cylinder a is provided with a crown wheel g gearing with
a worm h fixed to a shaft the latter is carried by a bearing, and by a part of
the real wall of the trough d, and is provided at its rear end with a bevel wheel l
genug with a like wheel msecured to shaft f. Therefore the rotation of the
latter is transmitted to the cylinder a by the bevel-wheels in l, shaft 1, worm & and
crown-w liecl 9.
It will be seen, that the cylinder a with the wheel gare alternately lifted and
dropped by the action of the cams e upon the levers o c', therefore an oscillatory
motion is compounded with a rotatory one. These two motions co-operate in such
a way, that neither of them is impeded by the other This has not been attained
in the prior form of construction, in which the 1otatory motion was transmitted by
a rocking shaft having one of its beatings in one of the levers operated by the
CANIE.
The position of the cog wheels secured to said rocking shaft was thus alternately
a perfectly vertical and a somewhat inclined one, and the teeth of the respective
wheels were in consequence thereof very soon worn away, the inore rapidly as the
backlash owing to the wear of the teeth ncreased by reason of the increasing
violence of the shocks between the said wheels
9,
All this is avoided by the improved construction herein before described in which
on account of the radial, or nearly radial aangement of the teeth of wheel
on the corresponding inclination of the thread of worm the proper gearing of the
and
wheels is maintaimed at every position of the cylinder by a fai less complicated
arrangement The cost of manufacture of the improved strainer is reduced and a
further saving is effected by the reduction of power required to dive it
Another improvement consists in arranging the cog wheel g of the cylinder a not
between the casing proper of the latter and one of the levers supporting the cylinder
(as bas been done hitherto) but in airanging the said wheel at the other side of the
Said lever the latter being thus situated between the casing proper of the cylinder
and said wheel g. Owing to this arrangement, I am enabled to make the spaces
between the frontal ends of the cylinder and the two levers of equal width the strain
of said levers is thus exactly the same both the bearings wear equally and the
cylinder is always perfectly horizontal which also is of importance for the
prevention of undue shocks.
Having now particularly described and ascertained the nature of my said inven-
tion and what mauner the same is to be performed declare that what I
cluain is
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1. In a rotary strainer the cylinder of which is subjected to intermittent shooks
the combination with said cylinder of a crown wheel secured thereto and of a worm
gearing with said crown wheel, said worm being adapted to transmit the motion of
the main shaft to said cylinder during the oscillations of the latter for the purpose
specified.
2 In a rotary strainer the combination of an oscillating cylinder with a crown-
wheel having radial, or nearly radial, teeth and of a worm gearing with said
crown-wheel said worm being adapted continuously to transmit the notion of the

page_text: main-shaft to said cylinder during the oscillatious of the latter for the purpose
specified.
3 In a rotary strainer having an oscillating cylinder supported by levers adapted
to transmit to said cylinder the shocks impaited to them by cims the combination
with the said cylinder of a crown-wheel having radial or nearly radial teeth
attached to one of the hollow trunnions of the cylinder and of a worm gearing with
said crown-wheel, said worm being adapted continuously to transmit the motion of
the main shaft to said cylinder also during the oscillations of the latter the lever
next to the said crown-wheel being arranged between the latter and the end of the
said cylinder for the purpose as described
Dated this 4th day of May 1895.
T. E. HALFORD,
11, Furnival Street, Holborn, E.C, Agent for Applicant.