Improvements in raper maning
Year: 1893

page_text: Date of Application, 19th Apr., 1893
Complete Specification Left, 19th Feb., 1894-Accepted, 14th Apr.,
1894
Improvements in raper maning TRO
I, ROBERT WIGHTON MONCRIEFF Engineer of "Brookhurst," Demesne Road,
Alexandra Park, Manchester, do hereby declare the nature of this invention to be
as follows:-
My invention has reference to paper making machines and more particularly to
machines in which a number of separate travelling moulds are employed and its
main object is to reduce the number of moulds required for each size of sheet, and
to simplify the mechanism whereby the moulds are made to travel.
Hitherto the separate moulds have generally been jointed together at their ends
so as to constitute a sort of endless chain of moulds which, has been made to pass
round semi-circular frames at the two ends of its travel by means of an arrangement
of racks, spur wheels, and other like devices.
Now according to my invention I string the separate moulds loosely upon endless
ropes or bands which are caused to travel at considerably greater speed than the
speed of the moulds at the time the paper is being formed thereon; this loose
connection of the moulds to the ropes may conveniently be formed by means of
eyes or rings at the sides of the moulds through which eyes the ropes freely pass.
1 employ an endless wire web as in an ordinary Fourdrinier machine this web being
driven at the ordinary speed. The separate moulds in that part of their travel
which is between the feed and the couch rolls are held between the endless wire
web and the deckle straps and therefore travel at the same speed as the web and
deckle straps, while the ropes travelling at a greater speed run freely through the
eyes of the moulds. After passing the couch rolls each successive mould is gripped
by means of its eyes between the ropes and pulleys around which the ropes pass at
this end of the machine. The mould thus grippet consequently begins to travel
at the same speed as the ropes and this speed is maintained whilst the mould with
the ropes returns along the underside of its course and passes round pulleys at the
other or feed end of the machine between which pulleys and the ropes the eyes of
the mould are again gripped. On leaving these pulleys at the feed end of the
machine the moulds come between rubber faced feed discs and rollers which check
any excess of speed; these discs and rollers rotate at such a rate as to feed in each
successive mould until it comes in close but gentle contact with the mould in front
of it the moulds thus forming a level surface for the reception of the pulp. The
moulds being now, that is to say, between the feed and the couch rolls, upon the
surface of an endless wire, a perfectly flat mould surface is obtained without
the use of carrying bars, links, mould frames and other devices which have
hitherto been found necessary where a chain of travelling moulds has been
employed.
When desired the moulds can be readily removed for examination or repair and
can be replaced by others by unscrewing the eyes which are interchangeable. The
machine can also if required be run without the moulds with the wire under the
pulp in the ordinary way for continuous web papers.
The machine is preferably driven by gearing direct from bottom press roll to the
lower couch roll; a uniform steady travel of the moulds between the feed and the
couch rolls is thus ensured which is not the case when the moulds are driven by
means of racks.
The eyes on the moulds are preferably made to swivel so that they may be better
adapted for passing round the pulleys.

page_text: The moulds are preferably made of longitudinal metal ribs secured to transverse
metal bars at the sides and middle of the mould.
Dated this 19th day of April 1893.
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.
improvements in Paper making machines.
I, ROBERT WIGHTON MONCRIEFF Engineer, of "Brookhurst," Demesne Road,
Alexandra Park, Manchester, 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 to paper making machines of the kind in which a
number of separate travelling moulds are employed, and its main object is to reduce
the number of moulds required for each size of sheet, and to simplify the mechanism
whereby the moulds are made to travel.
Hitherto the separate moulds have generally been jointed together at their ends
so as to constitute a sort of endless chain of moulds which has been made to pass
round semicircular frames at the two ends of its travel by means of an arrangement
of racks, spur wheels and other like devices.
Now according to my invention I string the separate moulds loosely upon endless
bands or ropes which are caused to travel at considerably greater speed than the
speed of the moulds at the time the paper is being formed thereon; this loose
connection of the moulds to the bands may conveniently be formed by means of
eyes or rings at the ends of the moulds through which eyes the bands freely pass.
I employ an endless wire web as in an ordinary Fourdrinier machine, or
may
employ two or more narrow webs, this web or these webs being driven at the
ordinary speed. The separate moulds in that part of their travel which is between
the feed and the couch rolls are held between the endless wire web and the deckle
straps and therefore travel at the same speed as the web and deckle straps, while
the bands travelling at a greater speed run freely through the eyes of the moulds.
After passing the couch rolls each successive mould is gripped by means of its eyes
between the bands and pulleys (preferably rubber covered) around which the bands
pass at this end of the machine. The mould thus gripped consequently begins to
travel at the same speed as the bands and this speed is maintained whilst the mould
with the bands returns along the underside of its course and passes round the
pulleys (also preferably covered with rubber) at the other or feed end of the
machine, between which pulleys and the bands the eyes of the mould are again
gripped. On leaving these pulleys at the feed end of the machine the moulds come
between rubber faced feed discs and rollers which check any excess of speed; these
discs and rollers rotate at such a rate as to feed in each successive mould until it
comes in close but gentle contact with the mould in front of it, the moulds thus
forming a level surface for the reception of the pulp. The moulds being now, that
is to say between the feed and the couch rolls, upon the surface of an endless wire
web (which at this part of its travel is as usual supported on rollers) a perfectly flat
mould surface is obtained without the use of carrying bars, links, mould frames and
other devices which have hitherto been found necessary where a chain of travelling
moulds has been employed.
When desired the moulds can be readily removed for examination or repair and
can be replaced by others, the eyes being preferably made partly open so that they
can be slipped off or on to the bands as required. If it be desired to produce
continuous web paper the machine can be run without the moulds with the wire
web under the pulp in the ordinary way.

page_text: The machine is preferably driven by gearing direct from the bottom press roller
to the lower couch roll; a uniform steady travel of the moulds between the feed
and the couch rolls is thus ensured, which is not the case when the moulds are
driven by means of racks.
The moulds are preferably made of longitudinal metal ribs secured to transverse:
metal bars at the sides and middle of the mould.
Figure 1 of the accompanying drawings is a side elevation of a paper making
machine constructed according to this invention.
Figure 2 is a plan, the endless wire web and most of the parts above the level of
the same being removed, and only some of the rollers that support the wire web.
being shown.
Figure 3 is a partial end view, looking towards the right, of Figures 1 and 2:
showing the feed discs and rollers hereinbefore described between which the moulds.
come at the feed end of the machine.
Figure 4 is a side view on a larger scale of one of the pulleys around which the
moulds are carried by the bands at the delivery end of the machine, and also.
indicating the moulds and bands.
Figure 5 is a plan and Figure 6 a side view of a portion of one of the
moulds.
a is an endless wire web as in an ordinary Fourdrinier machine; this web passes.
at one end of its travel around the lower couch roll band at the other end around
the breast rolle; between these rolls it is supported by the rollers d d and by the
rollers e e in the suction box f; at the under part of its travel it passes over and
under the guide rollers ggg; the web a is driven at the ordinary speed, the motion
being preferably given by a belt passing around a pulley on the lower couch
roll b. is one of the ordinary deckle straps. kk are the separate moulds; they
are strung loosely upon endless bands that are caused to travel at considerably
greater speed than the speed of the moulds at the time the paper is being formed
thereon. This loose connection of the moulds to the bands is shown as formed by
means of partly open eyes m m at the ends of the moulds, through which eyes the
bands freely pass. The separate moulds at the part of their travel which is
between the feed n and the couch rolls are held between the wire web a and the
deckle straps i, and therefore travel at the same speed as the wire web, while the
bands travelling at a greater speed run freely through the eyes m m of the moulds.
After passing the couch rolls each successive mould becomes gripped by means of
its eyes between the bands and pulleys p p around which the bands pass at this
end of the machine. The mould thus gripped consequently begins to travel at the
same speed as the bands, and this speed is maintained whilst the mould with the
bands returns along the underside of its course and passes round pulleys q 9 at.
the feed end of the machine, between which pulleys and the bands the eyes of the
mould are again gripped. The bands / receive their motion from the pulleys pr
the shaft of which is driven by a belt passing around a pulley s. On leaving the
pulleys each mould comes between rubber faced feed discs t t and rollers u u
which check any excess of speed; the discs tt are driven by belts from a pulley
or pulleys on the shaft of the pulleys qq and rotate at such a rate as to feed in
each successive mould until it comes into close but gentle contact with the mould in
front of it. It will thus be seen that between the feed and the couch rolls there is
always a level mould surface for the reception of the pulp. In order to ensure
proper alignment of the moulds they are each formed with two or more dowels w
(Figure 4) at one side and two or more recesses at the other side, so that when
one mould comes into contact with another at the feed end the dowels on the one
will enter the recesses in the other and bring the moulds into alignment if they are
not already so. The shaft v of the pulleys qg has its bearings in sliding cheeks
which can be adjusted backwards and forwards by screws 2 and hand wheels so as
to regulate the tension of the bands ll as required.
?"
By means of my invention the number of the moulds required is very greatly
reduced. Hitherto as many moulds have been required as will make an endless

page_text: chain of them, but with my invention one or several moulds in addition to those
actually between the feed and the couch rolls suffice, because owing to the speed of
the bands, every mould after passing the couch rolls is carried very rapidly to
the feed discs tt. The speed of the bands 11 relatively to the speed of the wire
web a must of course be such as to bring each successive mould to the feed discs
at the proper time.
If mould has to be removed for examination or other reason the belts can
readily he slipped out of the eyes m m in the manner indicated in dotted lines in
Figure 6, and the mould can be as readily replaced in a similar manner.
Whenever it may be desired to produce a continuous paper web on the machine
it is only necessary to remove the moulds and the paper will be formed on the
wire web a in the ordinary way.
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 1
claim is :-
1. In a paper making machine of the kind in which a number of separate
travelling moulds are employed, the stringing of the moulds loosely upon endless
bands or ropes that travel at considerably greater speed than the moulds at the
time the paper is being formed thereon, the moulds travelling at the normal speed
and independently of the bands or ropes between the feed and the couch rolls and
at the considerably greater speed with the bands or ropes at the other part of their
course, substantially as herein before described.
2. In a paper making machine having moulds loosely strung upon endless bands
or ropes and travelling in the manner referred to in Claim 1, the feed discs t t and
rollers uu substantially as and for the purpose herein before described.
3. The combination of separate moulds and an endless wire web, the said moulds
resting upon the surface of and travelling with the wire web between the feed and
the couch rolls, and the wire web being itself supported by rollers, substantially as
hereinbefore described.
4. The improved paper making machine constructed and working substantially
as herein before described and represented in the accompanying drawings.
Dated this 19th day of February 1894.
J. C. MEW BURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.