Improvements in the Method of and Means for Removing Bark from Logs used in the Manufacture of Wood Pulp.
Year: 1894

page_text: Date of Application, 12th July, 1894
Complete Specification Left, 1st Apr., 1895-Accepted, 4th May, 1895
PROVISIONAL SPECIFICATION.
Improvements in the Method of and Means for Removing Bark
from Logs used in the Manufacture of Wood Pulp.
I, THOMAS THORNLEY of Woolfold, Bury, in the County of Lancaster,
Manager, do hereby declare the nature of this invention to be as follows:-
In the process of barking logs preparatory to their use in the manufacture of
wood pulp, a considerable waste of timber and loss of time occur in removing the
bark from hollows and other than convex parts of the logs, which it is the object
of this invention to obviate.
For this purpose 1 remove the bark by suitably moving the logs in face of and
contact with a rapidly rotating cylindrical metallic brush. This brush is fitted
with hard metallic wires or teeth in place of bristles and preferably has a length
less than that of the logs to be barked. The form of this barker enables the
concavities in the logs to be perfectly reached and decorticated without necessarily
removing the wood in their neighbourhood. It also enables protuberances to be
barked without removing the subjacent wood.
1
A D 1001
WILLIAM E. HEYS,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Method of and Means for Removing Bark
from Logs used in the Manufacture of Wood Pulp.
1, THOMAS THORNLEY of Woolfold Bury in the County of Lancaster,
Managing Director of Paper Works, 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 :-
In the process of barking logs preparatory to their use in the manufacture of
wood pulp, a considerable waste of timber and loss of time occur in removing the
bark from hollows and other than convex parts of the logs, which waste and loss
it is the object of this invention to obviate.
For this purpose I remove the bark by suitably moving the logs in face of and
in contact with, a rapidly rotating cylindrical metallic brush. In use, the sides
of the logs are presented to the rotating brush, in contact with which each log is
turned and moved longitudinally until it is completely decorticated.
The cylindrical brush is fitted with hard metallic wires, or with flexible teeth,
or the like, in substitution for the bristles of an ordinary brush, and it preferably
has a total length less than that of the logs to be barked.
The accompanying drawing illustrates my invention diagrammatically in end
elevation.
The cylindrical brush B is mounted in suitable bearings and is driven by a belt
and pulley or otherwise, at a high speed. The log to be barked, L, is supported
in front of the brush, by any suitable means, such as that indicated at S, in such a.

page_text: manner that it can be turned axially and moved longitudinally in contact with the
brush so as to bring every part of the surface of the log into contact with the brush.
Guard plates or shields of any convenient and known construction may be employed
in combination with the barking brush, as well as the accessories used with ordinary
barking machines.
It will be seen that the form and construction of the barking brush enables the
concavities of the logs to be perfectly reached and decorticated without necessarily
removing the wood in their neighbourhood. It also enables protuberances to be
barked without removing the subjacent wood.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is
1. The hereinbefore described method for removing bark from logs, substantially
as and by the means set forth.
2. Apparatus for barking logs, having as its essential feature a rotary cylindrical
metallic brush, constructed and operating substantially as hereinbefore described.
Dated this 30th day of March A.D. 1895.
WILLIAM E. HEYS,
Agent for the Applicant.