IMPROVEMENTS IN MACHINES OR APPARATUS FOR GRINDING WOOD INTO PULP OR STOCK FOR THE MANUFACTURE OF PAPER."
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by Ernest de Pass at the Office of the
Commissioners of Patents on the 18th September 1877. A communication
from abroad by Arvid Henry Elliott, of the City and State of New York,
United States of America, Gentleman.
#1
ERNEST DE PASS, of Fleet Chambers, 68, Fleet Street, in the City of London,
Patent Agent.
IMPROVEMENTS IN MACHINES OR APPARATUS FOR GRINDING WOOD
INTO PULP OR STOCK FOR THE MANUFACTURE OF PAPER." A communication from
abroad by Arvid Henry Elliott, of the City and State of New York, United States
of America, Gentleman.
The object of this Invention is to disintegrate fibre from wood for paper pulp or
stock in a more simple, rapid, and economical manner than heretofore.
In accordance with my Invention, a cylindrical case or shell is formed or mounted
on a hollow shaft driven by a pulley and mounted in bearings on a frame. Inside
this cylindrical case or shell I provide one or more "annulars" or rings of stone,
and secure them thereto by means of bolts, or otherwise. These rings of stone may
have their grinding surface channelled or corrugated, either longitudinally or spirally,
to assist the more rapid separation of the fibre or pulp.
Within the cylindrical case or shell, adjustable tables, suspended on brackets, are
placed as near as practical to the grinding surface in order to prevent the separation
of slivers from the strips being ground instead of fibres. Attached to these tables
are guides which are made adjustable laterally at their outer ends by clamping
screws; by these means the wood may be presented to the grinding surface more or
less diagonally across the grain. Above these guides, plates are secured to the
tables, sufficient space being left to receive the wood to be ground. They act as a
table on the side where the grinding surface is moving upwards, and keep the strips
that are being ground in place; they must just clear the grinding surface so as to
prevent slivers forming, and cause all pieces to be thoroughly ground to pulp.
A water pipe is inserted into the machine or apparatus through the hollow shaft,
that portion of it within the cylinder being perforated to admit a constant shower
of water upon the grinding surface so as to free it from the ground stock or pulp,
and to cause it to float out into a receptacle below provided for it. The water
D.6.1

page_text: passing through the hollow shaft keeps it from becoming heated, and saves a large
amount of lubrication.
A much higher speed can be sustained with safety in this machine or apparatus
than in other wood grinding or pulping engines employing a stone grinding surface,
as the stones in this case are prevented from bursting or displacement by the
cylinder when running at a very high speed.
By the employment of a concave grinding surface, the edge of the strips acted
upon are thoroughly ground, cylindrical or convex instead of concave, in cross
section, as heretofore, and this form renders them much stronger as they become
reduced, and consequently are scarcely ever liable to break off in slivers, all being
wholly reduced to fibrous pulp.
Any suitable feeding apparatus may be used, either automatically or otherwise.