Improvements in or relating to Rotary Pulp-strainers,
Year: 1895

page_text: Date of Application, 7th May, 1895
Complete Specification Left, 7th Feb., 1898-Accepted, 7th Mar., 1896
Improvements in or relating to Rotary Pulp-strainers,
I, ROBERT DIETRIOU, Paper Manufacturer, of the Fum of Dietrich Brothers,
of Merseburg, in the Empue of Germany, do hereby declare the nature of this
invention to be as follows:-
Hitherto rotary pulp-strainers have been operated by means of bevel and worm-
wheels. This method of driving them, is attended by a notable loss of power and
wear of machinerv.
The object of this invention is to supersede the above-named arrangement with
all its defects and still keep the sifting cylinder-drum continuously in movement at
a speed suntable to its purpose.
At both ends of the sifting cylinder-drum, bent levers in which the necks of the
dium are carried, are provided, and at one end are supported by hinges while, at
the other end they rest by means of hammer-pieces on cam-wheels.
The levers are of peculiar form, inasmuch as their centre-lines he slantwise, and
the striking arm lies higher in level than the short or carrying arm.
The cam-wheels, which may be replaced by any means similarly operating, are
mounted on one common shaft, which is rotated at different speeds by coned or
speed-pulleys.
If this shaft be rotated the cariying levers, owing to the rapid series of up and
down movements of the hammers or supports resting upon the cam-wheels, are
correspondingly shaken up and down, which movement, owing to the special form
of the supporting levers, is transformed into a shaking and simultaneously rotary
motion of the sifting drum, in such manner that the drum will make a definito
number of revolutions in the direction indicated, in proportion to the speed of the
shaking.
The speed of rotation of the sifting cylinder may conveniently be allowed to
vary from say one to two and a half revolutions per minute, for instance, the
applicant has obtained two and a half rotatious of the sifting drum from one
hundred and forty revolutions of the cam-wheel, por minute.
As will readily be perceived this arrangement is equally applicable when the
pulp finds its way into the drum or cylinder and thence outwards by the slots, as
when the pulp travels from outwards inwards.
Dated this 7th day of May 1895.
BOULT & WADE,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Rotary Pulp-strainers.
1, ROBERT DIETRICH, Paper Manufacturer, of the Firm of Dietrich Brothers,
of Merseburg, in the Empne of Germany 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
Hitherto rotary pulp-strainers have been operated by means of bevel and worm-

page_text: wheels. This method of driving them is attended by a notable loss or power and
wear of machinery.
The object of this invention is to supersede the above named ai rangement with
all its defects and still keep the sifting cylinder-drum continuously in movement at
a speed suitable to its purpose
The invention is illustrated in the accompanying drawings, in which
Figure 1 is a plan and
Fig. 2 an end elevation of the apparatus.
At both ends of the sifting cylinder-drum A are provided bent levers C, in which
the necks or hollow trunnions B of the drum are caired, these levers at one end
beng supported on hinges or pivots D while, at the other end they rest by means
of preferably adjustable hammer-pieces or supports E on cam-wheels F. The
levers are preferably cut away as at C¹ to leave the truuuions B free.
The fice ends of the levers C may either be somewhat higher than the pivotted
ends thereof as shown in Fig. 2, o at the same level as or a lower level than the
pivotted ends.
The cam-wheels F, which may be replaced by any means similarly operating,
are mounted on one common shaft G, which may he rotated by a pulley H or other
suitable means.
If the shaft G be rotated in the direction indicated by the arrows h the lovers C,
and straining drum A owing to the rapid series of up and down movements of the
hammers or supports E resting upon the cam-wheels F, are correspondingly shaken
up and down the drum A by, and simultaneously with this movement, being also
caused to rotate on its axis, in the direction indicated by the arrow a at a speed
proportionate to the speed of the shaking.
To prevent noise and undue wear of the machine 1 provide indiarubber or other
stops or buffers C2 which arrest the descent of the levers C and drum A. These
buffera C 2 may be adjustable either in the levers C as indicated or in the machine
frame so as to enable the extent of rise and fall of the drum to be regulated.
The speed of rotation of the straining drum A may conveniently be allowed to
vary from say 1 to 2 revolutions per minute; for instance, I have obtained
2 rotations of the sifting drum from 140 revolutions of the cam-wheel, per
minute.
As will readily be understood this arrangement is equally applicable to cases in
which the pulp is introduced into the drum or cylinder A to find its way outwards
through the perforated wall of the drum and those in which the pulp travels from
outwards inwards.
Нау
ving now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim 18,-
1. In a pulp strainer the combination with a drum auch for examplo as A and
levers such as C on or in which the drun is revolvably mounted of mechanism for
raising the levers and suddenly lowering them or allowing them to suddenly fall
substantially as described and illustrated in the accompanying drawings.
2. The combination and arrangement of parts constituting the complete pulp
strainer substantially as described and illustrated in the accompanying drawings.
Dated this 7th day of February 1896.
BOULT & WADE,
Agents for the Applicant.