Improvements in the Vacuum or Suction Boxes of Paper Making and like Machines.
Year: 1898

page_text: Date of Application, 16th Nov.,
1898
Complete Specification Left, 16th Aug., 1899-Accepted, 11th Nov., 1809
PROVISIONAL SPECIFICATION.
Improvements in the Vacuum or Suction Boxes of Paper Making
and like Machines.
I, DAVID NOBLE BERTRAM, of St. Katherine's Works, Sciennes, Edinburgh,
Engineer, do hereby declare the nature of my said invention to be as follows
These improvements relate to the vacuum or suction boxes of paper making
and like machines, and consist of new or improved construction and arrange-
ment of parts whereby the difficulties hitherto connected with roller vacuum
boxes are obviated, there being no flexible connections between the box and the
rollers to ensure tightness as heretofore, which are a source of trouble by letting
pulp in, admitting air, and so destroying the vacuum.
According to this invention the vacuum box is provided with two or more
rollers which are driven by any suitable gearing at the same surface speed as
the wire cloth of the paper machine. Each roller rests along its entire length
on a bearing piece which may be of any suitable material or section and shaped
to fit the roller, and between each pair of rollers at each end the usual move-
able end pieces are applied made to fit in between the rollers and regulated to
suit the width of paper being made.
The vacuum box is filled with water which lies around the outside of the outer
rollers and between each pair of rollers up to the moveable ends for the purpose
of preserving the vacuum. The bars which support the rollers can be made
hollow in the centre into which water can be pumped or run so as to relieve
the friction between each roller and its bearing piece.
The air and water are extracted from the pulp downwards in the usual manner
between each pair of rollers. By this arrangement the rollers are driven at the
same surface speed as the wire cloth and the friction removed from the wire
cloth to the bearing pieces on which the rollers revolve.
Each roller is provided with journals, regulating collars, and driving pinion,
and one saddle piece, with suitable bearings formed therein for all the rollers,
keeps them in their relative positions.
To prevent the rollers from wearing out of parallel, and from ridging, they
are caused to move endways to and fro by suitable gearing, and this motion
keeps the joint between the rollers and the bearing pieces smooth and tight,
and from the fact of there being no pulleys placed at intervals below them, as
has heretofore been done, any little wear which takes place on the roller is
equally distributed over its surface.
sambon 1808

page_text: Improvements in the Vacuum or Suction Boxes of Paper Making
and like Machines.
I, DAVID NOBLE BERTRAM, of St. Katherine's Works, Sciennes, Edinburgh,
Engineer, 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:-
These improvements relate to the vacuum or suction boxes of paper making
and like machines and the accompanying 2 Sheets of drawings illustrate so
much of a vacuum box as is necessary to demonstrate the application of my
improvements thereto.
I
Un Sheet One, Fig. 1 is a broken longitudinal section, and Fig. 2 a plan.
Fig. 3 is a transverse section on line ab
On Sheet Two,
Fig. 4 illustrates a broken plan and Fig. 5 a transverse section on line o-d
of a modification
According to my invention, the vacuum box (A) is provided with two or
more rollers (B), which are driven by any suitable gearing at the same surface
speed as the wire cloth of the paper machine. Each roller rests along its entire
length on a bearing piece (C) which may be of any suitable material or section
and shaped to fit the roller, and between each pair of rollers at each end the
usual moveable end pieces (D) are applied, which fit in between the rollers
and are regulated by screws (E) to suit the width of paper being made.
The vacuum box is filled with water around the outside of the outer rollers,
and between each pair of rollers up to the moveable end pieces for the purpose
of making the joints air tight.
The bearing pieces (C) are cach made hollow in the centre into which water
can be pumped or run so as to relieve the friction between each roller and its
bearing piece.
!
Each roller is provided with journals (F) at both ends, regulating collars (G)
and a driving pinion (H), and the said journals run in suitable bearings formed
in saddle piece (I) for keeping all the rollers in their proper relative positions.
The several pinions (H) are driven from pulley (J), shaft (K), pinion (L)
on said shaft, and an intermediate pinion (L).
To prevent the rollers from wearing out of parallel or ridging, they are given
a slow to-and-fro endwise movement and for this purpose I employ an eccen-
tric stud (M) engaging with a slide (N) in saddle (I) and driven by worm
gearing (P). This motion keeps the joint between the rollers and the bearing
pieces smooth and tight and from the fact of there being no pulleys placed
at intervals below them as heretofore, any little wear which takes place on the
rollers is equally distributed over their surfaces.
The air and water are extracted from the pulp downwards in the usual manner.
between each pair of rollers.
As aforesaid the rollers are driven at the same surface speed as the wire cloth
and the friction is removed from the wire cloth to the bearing pieces (C).
In Fig. 4 I shew a modification in which the rollers are driven by separate
sprocket or chain wheels (2) with the endwise movement imparted by a lever (R)
having a reciprocating motion on the fulcrum (S) and engaging with studs on
the journals or axles (T) of the rollers in imparting the to-and-fro movements
thereto.
In some cases I may make two adjoining bearing pieces in one, and carry
the central part up against the sides of the rollers, as shewn in Fig. 5, which

page_text: has the advantage of more effectively supporting the rollers against the side
pressure. Such central portion is cut away at each end to allow room for the
filling strips, and has openings (U) formed in it leading to the pump.
Having thus 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: In vacuum boxes for paper making machines, the combination of a set
of rollers and a corresponding set of bearing pieces on which the rollers are
supported for their entire length, a set of adjustable filling pieces, and means
for driving the said rollers, substantially as set forth.
2: In vacuum boxes for paper making machines, a set of bearing pieces
with central parts hollow and supplied with water, and their upper face adapted
to receive and support a set of rollers, as set forth.
3: In vacuum boxes for paper making machines, the constructions and
combinations of parts substantially as herein set forth and illustrated on the
accompanying drawings.
.נ.ית
172
1000
DAVID NOBLE BERTRAM.
By John G. Wilson & Co., Fels.I.P.A.,
Patent Agents to the Applicant, 55, Market Street, Manchester.