Improvements in Strainers for Paper Making Machines.
Year: 1895

page_text: Date of Application, 16th Mar., 1895
Complete Specification Left, 16th Dec., 1895-Accepted, 18th Jan., 1896
PROVISIONAL DIUITIATION.
Improvements in Strainers for Paper Making Machines.
We, JOHN LAW of Balerno Bank Paper Mill, Balerno, North Britain, Paper
Maker, and GORDON MCNEIL, Foreman in the said mill do hereby declare the
nature of this invention to be as follows:-
This invention relates to improvements in strainers for paper-making machines.
The strainer is to be round and convexed like a basin. Around the top to have
a strong ring to fit and bolt all the strainer plates to. At the bottom, or centre of
the basin to have another ring for the small end of the plates to be fitted and
bolted to. Into the inside of the bottom ring is fitted a round box for catching all
impurities, with a flange on the top and bottom sides-the top of the box to be
open. This box to be of such a length that when it is drawn up through the
bottom ring of the strainer until the bottom flange of the box is up against the
bottom ring of the strainer the mouth of the box will be rather higher than the top
of the strainer. The vat to be made circular to answer the strainer, and of
sufficient depth to allow the sand-box to go, down into its position. The bottom of
the rat to be turned to one side. At the small end of the vat to have a cock or
sluice to regulate the outflow of pulp. The frame of the vat to be high enough so
that the whole of the pulp in the vat can be run into the machine.
The motion or shake of the strainer to be got by having a strong bar passed
across the strainer and firmly bolted to it. The ends of the bar to project over
the vat about 5 or 6 inches at each side. Through this cross-bar there are two
perpendicular rods one at each end. The one end of the rod tightly serewed to
the cross bar-the other end passing through a guide and resting lightly on a cam
or ratchet that is keyed on a shaft running beneath the vat and parallel with the
cross bar on the strainer. Between the vat and the cross bar of the strainer is
fitted a bevelled pad to be worked with a screw so that the drop or shake of the
strainer may be regulated to whatever may be required. The ratchet runs in a
box filled with oil, which prevents all noise. It an auxiliary strainer be used along
with the above, the sand-box is taken out, a suitable connection made to the bottom
of the strainer and carried outside the vat and led off to the auxiliary.
ACTION.
In starting the strainer, shut the sluice and fill up the vat and strainer with
water, then let the pulp flow into the strainer and open the sluice enough, to take
away as much pulp as is flowing into the strainer. The pulp is delivered on the
side of the strainer which gives a circular flow to it, all impurities being naturally
deposited in the centre either in the sand-box or carried off to the auxiliary. In
cleaning the sand box, just draw it full up, take out the dirt, fill the box with
water and push it down to its place again-an operation which can be done in
2 minutes.
ADVANTAGES.

page_text: 4th. The dirt cannot possibly lie on the face of the plates as the flow of the pulp
carries it on and deposits it into the sand-box.
5th. The face of the plates being always, clean it passes a large quantity
of pulp.
6th. Its motion is a jog which is superior to suction or bellows for keeping back
dirt. Every papermaker has a jog motion on his auxiliary strainer, which, as
everybody knows, is the real dirt catcher.
7th. It saves the pulp better than any other strainer, as when shutting to wash
up, the whole of the pulp in the vat is run on to the machine.
Dated this 13th day of March 1895.
JOHNSONS,
115 St. Vincent Street, Glasgow, Petitioners' Agents.
Improvбщению
We, JOHN LAW, of Balerno Bank Paper Mill, Balerno, North Britain, Paper
Maker, and GORDON MCNEILL, Foreman in the said mill, 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 relates to improvements in strainers for paper making machines.
The strainer is round and concaved like a basin.
One method of carrying out our said invention is shown in the accompanying
drawings.
Figures 1. 2. and 3 are elevation, plan, and sectional elevation of our improved
strainer.
We form or construct the strainer A round and concaved like a basin. The:
strainer is composed of an upper or outer ring a and an inner or lower ring a¹ to
both of which the strainer plates B are fitted and securely bolted. The vat C is
also made circular so as to suit the strainer A and the said vat is made of sufficient
depth as to allow of the necessary rise and fall or shake of the strainer. The said
vat C. is mounted on a suitable frame D of sufficient height as to permit of all the
pulp in the vat C being run off into the machine; said running off of the pulp
being effected by means of the outlet or lower pipe E which may if desired be
provided with a regulating cock or sluice for regulating the outflow of the pulp.
The inner or lower ring al is so formed with an opening as to receive a round
sand box; said opening as shown in Fig. 3 being provided with means such as a
spring and telescopic rings so as to allow for the shake of the strainer, and to catch
all impurities which then pass off through the outlet or discharge pipe F to the
auxiliary if such be used.
The action or shake motion of the strainer may be obtained by means of the
following arrangement:-We bolt or otherwise secure to the top of the strainer a
strong cross bar, the ends of which project over the sides of the vat at each side;
through the said projecting ends are passed two perpendicular rods, the top ends
of which are firmly secured to the cross bar, while the lower ends pass through
guides and rest on cams or ratchets keyed on a shaft running beneath the vat and
parallel with the cress bar.
Or as shown in the drawings the motion or shake of the strainer may be obtained
by means of an X shaped bar G the ends of which are connected to lugs G' on the
vat C by means of slotted openings and bolts g. The centre of the said bar G is
connected to the top end of an adjustable actuating rod H which passes down
through the centre of the vat C, and after passing through a rubber spring J, is
adjustably connected to a frame K which carries an adjustable bearing piece k,
which works on the periphery of a ratchet L keyed on a horizontal driving
shaft M.

page_text: ADVANTAGES.
1st. It is a very perfect strainer, requiring no auxiliary.
2nd. It concentrates all the dirt into smaller space than any other strainer.
3rd. It can be cleaned out while working without altering the weight or making
the paper dirtier while being cleaned.
4th. The dirt cannot possibly lie on the face of the plates as the flow of the pulp
carries it on and deposits it into the sand box.
5th. The face of the plates being always clean it passes a large quantity
of pulp.
6th. Its motion is a jog which is superior to suction or bellows for keeping back
dirt. Every papermaker has a jog motion on his auxiliary strainer, which, as
everybody knows, is the real dirt catcher.
7th. It saves the pulp better than any other strainer, as when shutting to wash
up, the whole of the pulp in the vat is run on to the machine.
Between the cross bar and the vat is fitted a bevelled pad to be worked with a
screw so that the drop or shake of the strainer may be regulated.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1st. In paper making machines, the general arrangement and construction of our
improved basin shaped strainer, substantially as and for the purposes hereinbefore
described and shown in the accompanying drawings.
2nd. The arrangement, construction and combination of the basin-shaped
strainer A having rings a and a', with the round vat C, substantially as herein-
before described and shown in the accompanying drawings.
3rd. The arrangement of the actuating gear in combination with a basin-shaped
strainer, substantially as hereinbefore described and shown in the accompanying
drawings.
Dated this 14th day of December 1895.
JOHNSONS,
115 St. Vincent Street, Glasgow, Applicants' Agents.