Improvements in Breaking and Beating Engines for Grinding or Beating Pulp.
Year: 1892

page_text: Date of Application, 15th Aug., 1892
Complete Specification Left, 15th May, 1893-Accepted, 17th June, 1893
PROVISIONAL SPECIFICATION.
Improvements in Breaking and Beating Engines for Grinding or
Beating Pulp.
I, JAMES BEVERIDGE of 4 Kent Road, Gravesend in the County of Kent,
Paper Maker, do hereby declare the nature of this invention to be as follows:-
My invention has reference to the breaking and beating engines sometimes called
"Hollanders" used by paper makers for grinding or beating pulp to the requisite
degree of fineness.
-
In the ordinary construction of these engines the roll is partially immersed in
the pulp and as it revolves the pulp presses against its breast and impedes its
motion.
Now the object of my invention is to construct these breaking and beating
engines in such manner that the pulp is prevented pressing against the breast of
the roll which can therefore revolve more freely; power is thus economized.
With this object I employ a guard in front of the roll. This guard may be
rigidly fixed to the sides of the shell and mid-feather of the engine, but it is
preferably made adjustable in suitable guides by means of a screw or other suitable
adjusting arrangement so that the distance between its lower edge and the bottom
of the engine can be increased or diminished as desired The slot or opening
between the lower edge of the guide and the bottom of the engine forms the way or
passage through which the pulp is drawn by the roll. When the guard is not
made adjustable it can be bolted or otherwise fixed to the inner walls of the engine,
the size of the slot or opening which it forms with the bottom of the engine, being
determined in accordance with the requirements of the manufacture.
The guard may be either inclined or vertical and either curved or straight.
Dated thin with the of Au1005
J. C. MEW BURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.
COMPLETE
SPECIFICATION.
Improvements in Breaking and Beating Engines for Grinding or
Beating Pulp.
I, JAMES BEVERIDGE of 4 Kent Road, Gravesend, in the County of Kent,
Paper Maker, 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 the breaking and beating engines sometimes called
"Hollanders" used by paper makers for grinding or beating pulp to the requisite
degree of fineness.
In the ordinary construction of these engines the roll is partially immersed in
the pulp and as it revolves the pulp presses against its breast and impedes its
motion.
Now the object of my invention is to construct these breaking and beating
engines in such manner that the pulp is prevented pressing against the breast of
the roll which can therefore revolve more freely; power is thus economized.
With this object I employ a guard in front of the roll. This guard may be
rigidly fixed to the sides of the shell and mid-feather of the engine, but it is
preferably made adjustable in suitable guides by means of a screw or other suitable
adjusting arrangement so that the distance between its lower edge and the bottom
Di Q77

page_text: of the engine can be increased or diminished as desired. The slot or opening
between the lower edge of the guide and bottom of the engine forms the way or
passage through which the pulp is drawn by the roll. When the guard is not
made adjustable it can be bolted or otherwise fixed to the inner walls of the engine,
the size of the slot or opening which it forms with the bottom of the engine being
determined in accordance with the requirements of the manufacture.
The guard may be either inclined or vertical and either curved or straight.
The accompanying drawing represents in sectional elevation a breaking and
beating engine constructed according to my invention in its preferred form.
A is the body of an ordinary breaking and beating engine. B is the roll, C the
"bed plate," and D the "back-fall.' The bed plate which may contain any
reasonable number of knives may be placed anywhere between the bottom of the
engine and half way up the back fall. It is shown at an angle of about 30° to a
line drawn vertically through the centre of the roll, an angle which I have found
to answer well. The back fall D is in a plane parallel with a tangent to the roll.
The guard which in accordance with my invention I place in front of the roll B is
shown as composed of two fixed parts EF extending from side to side of the engine
and a movable gate G the distance of which from the bottom of the engine can be
regulated or adjusted or entirely shut down as desired by rotating by means of a
suitable handle a worm shaft H which gears with a worm J on the outside of a nut
through which passes a screw L fixed to the gate G. M is a guide or bearing for
the gate G in the lower part of its travel. Other means of moving the gate G up
and down as required can be adopted, or if preferred the gate or guard can be
made immovable and it may either be inclined or vertical.
As has been already explained the guard prevents the pulp pressing against the
breast of the roll B and impeding its motion. Immediately the pulp passes the
bed plate C it is thrown off at a tangent from the roll knives with considerable force
and as the face of the back fall D nearest thé roll is in a plane parallel with this
tangent the pulp passes away freely.
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 I
claim is :--
In a breaking and beating engine for grinding or beating pulp, a movable or
fixed guard in front of the roll, substantially as and for the purpose hereinbefore
described.
Dated this 15th dow of Mo 1909
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.