Improvements in or relating to Knotters or Strainers used in Paper Making, also applicable to Pulp Sorting Apparatus.
Year: 1894

page_text: Date of Application, 5th Jan., 1894-Accepted, 10th Feb., 1894
COMPLETE SPECIFICATION.
Improvements in or relating to Knotters or Strainers used in Paper
Making, also applicable to Pulp Sorting Apparatus.
I, RUDOLF KRON of Golzern, Saxony, German Empire, Factory Manager, 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 :-
My invention has reference primarily to knotters or strainers used in paper
making and consists in the construction as hereinafter described of a flat knotter or
strainer. The same apparatus or device is also adapted for use as a pulp sorting
apparatus.
The invention is chiefly characterized by the provision above the knotter or
strainer, and in the frame enclosing the latter, of delivery passages through which
the coarser particles which collect on the strainer may be drawn off; these passages
are prolonged or continued in hollow prismatic bodies which transmit the peculiar
jolting motion received from a jolting wheel or crank, directly to the strainer plate
frame.
In this apparatus the jolting wheel which produces the jolting motion is located
in bearings centrally in the framework and under the ends of the plate-frame. This
jolting motion may be reduced or intensified according to requirement during the
working of the apparatus by suitable adjustment, and the shaking motion is, by
means of springs interposed between the parts for transmitting the motion, converted
into a motion acting to draw the pulp by suction through the strainer.
The pulp when drawn through is received into a box enclosing the strainer frame,
and is conveyed, for example in the case of a knotter or strainer, onto the sieve or
strainer of a paper-making machine.
Figure 1 of the accompanying drawings is a cross section, and Figure 2 a longi-
tudinal section of the arrangement as specified.
The side uprights or the framework X carry at the upper part the box B which
surrounds the strainer frame A, and from the lip or spout of which the collected
strained pulp is discharged. The centre of each upright X is constructed to guide
the parts that serve to transmit the jolting motion, and that serve to convey away
the coarser particles from the strainer.
The strainer plates are carried in the frame A. The frame is provided at its
ends with vertical passages a which communicate with the space above the strainer
plates immediately above the latter.
The frame rests at the centre of the lower edge of each of its ends on a perforated
elastic plate a¹ which is fixed on the edges of an aperture of the box B. The plate
is supported by the prismatic hollow body C which rests on springs E that are
carried in adjustable suspenders fixed in the side uprights.
The passages a branch off from the space above the strainer and they all open
through the aperture in the plate a¹ into the hollow body C which is provided with
a lateral discharge pipe c.
It is to be understood that similar passages a may also be provided in the longi-
tudinal sides of the shaking strainer frame, and be arranged so that they either open
into the passages in the transverse ends or into the hollow body C.
The discharge pipe at each side of the apparatus may be provided with a cock for
closing the discharge just referred to, or the pipes c may be connected by a flexible
pipe, and this latter be furnished with one stop-cock for both sides.

page_text: It will be seen that in the arrangement described, the space immediately above
the strainer plates has notwithstanding the jolting motion to be imparted to the
frame A with the plates, a discharge at its ends, or at its ends and longitudinal
sides, to be employed at intervals, for the purpose of allowing of the discharge of
the coarser particles (such as knots, dirt, coarse splinters &c.) that have been kept
back by the strainer.
The jolting motion is caused by the two jolting wheels D which are mounted on
a common shaft d provided with a driving pulley d².
Each jolting wheel D is enclosed in a box d³ which bears with its internal
projecting portion on the jolting wheel. The box d³ is guided, as is also the hollow
body C, in the side uprights X. The springs E hereinbefore mentioned are located
between the box d³ and the body C.
The jolting motion produced by the revolving jolting wheel is transmitted by the
box d, the springs E, the hollow body C, and the elastic plate a¹, to the strainer
frame A, whereby there is imparted to the strainers the vertical shaking motion
which causes the pulp fibres to be drawn or sucked through the strainer in a
degree corresponding to the fineness of the strainer.
In order to be able to regulate the intensity of the shaking motion, a buffer F is
arranged under the box d³. The said buffer may consist of rubber plates For of
springs F (indicated in dotted lines), the abutment of which may be raised or
lowered by means of a cam G on the spindle g by the medium of an adjusting
lever g¹. This lever may be fixed in any desired position in a slotted arc by means
of a thumb-nut and screw.
When the abutment f, with the buffer F, is pushed up by means of the lever
and cam, the box d³ is raised, and the jolting wheel has a weaker action on the
box d³, and consequently a weaker jolting or shaking motion is imparted to the
strainer frame. But the more the abutment is depressed, the more powerful will
be the action of the jolting wheel and the jolting or shaking of the strainer
frame.
The strainer frame A may be secured in position by being connected with the
hollow body C by means of a tension rod a which passes through the end walls of
the frame A and is furnished with a screw thread and a thumb nut a³; side
projections on the foot of the tension rod a² being arranged to clip under the upper
edge of the body C. But this connection must be disconnected when it is required
to turn up the strainer frame in the direction of the arrow p, for the purpose of
cleaning the under surface of the strainers and the bottom of the box B.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is :-
1. A flat knotter or strainer, or pulp sorting apparatus, having outlets arranged
immediately above the strainer surface in the shaking frame that encloses the
strainer plates, the said outlets being continued as conduits or passages in the walls
of the frame, for the purpose of conveying away the coarser particles kept back by
the strainer, substantially as hereinbefore described.
2. In a flat knotter or strainer, or pulp sorting apparatus, of the kind specified
in Claim 1, the discharge passages a of the shaking frame A discharging into
hollow bodies C which transmit the jolting motion produced in the apparatus,
directly to the shaking frame, substantially as herein before described.
3. In combination with the shaking frame A. and the hollow bodies C serving to
discharge the pulp and to transmit the motion, as specified in Claims 1 and 2, the
jolting wheels D arranged centrally to and in the framing of the apparatus and
under the ends of the shaking frame, for actuating the shaking frame through the
bottom of the box B surrounding the frame, buffers capable of adjustment during
the working of the apparatus, by means of a lever d², excentrics or cams G,

page_text: and a transverse shaft g, being provided for the purpose of regulating the said
motion, substantially as hereinbefore described.
Dated this 3rd day of January 1894.
J. C. MEWBURN,
55 & 56 Chancery Lane, London, Chartered Patent Agent.