Improvements in Pulping Engines for Paper Making.
Year: 1892

page_text: Date of Application, 2nd Sept., 1892
Complete Specification Left, 15th Dec., 1892--Accepted, 21st Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Pulping Engines for Paper Making.
I, WILLIAM UMPHERSTON of 83 Bonnington Road, Leith, in the County of
Midlothian, North Britain, Engineer, do hereby declare the nature of this invention
to be as follows:-
-
This invention relates to improvements in pulping engines for paper making
and forms an addition to or an improvement upon the engine as described in the
Specification of my Patent No. 1150 of 17th March 1880.
Pulping engines are usually constructed with a roller having a number of knives
or bars fixed round its circumference revolving upon, or in close proximity to, a
fixed block or "bottom plate" consisting of a number of knives or bars, or other-
wise constructed with a number of projecting edges; and the reduction of the
fibrous materials into pulp being effected while it passes between these moving and
fixed knives or bars, each time it returns from the back of the roll to its front, to
have the same action repeated until the whole contents of the engine have been
reduced to the condition wanted, and to complete this process some hours are
usually required.
To reduce the time required to complete this process I construct the engine with
two bottom plates instead of only one, against both of which the one roll will
operate, so that the material will be twice acted upon every time it passes the
roll.
The material circulates through a passage beneath the back fall and the fixed
bottom plates; but this arrangement of two bottom plates is also applicable to
engines in which the material circulates horizontally or otherwise from the back to
the front of the roll. The roll, the bottom plate, and the tub or trough with its
back fall may be formed similar to others in general use; but I use in addition to
the said ordinary bottom plate placed as usual vertically under the roll, another
plate placed between it and the top of the back fall, so that the material after being
acted upon while passing between the roll and the bottom plate will again be acted
upon while passing between the roll and the second plate before passing over the
back fall, to return again to the front of the roll to have the same action repeated.
Dated this 1st day of September 1892.
JOHNSONS,
115, St. Vincent Street, Glasgow, Petitioner's Agents.
COMPLETE SPECIFICATION.
Improvements in Pulping Engines for Paper Making.
I, WILLIAM UMPHERSTON of 83 Bonnington Road, Leith in the County of
Midlothian, North Britain, Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
This invention relates to improvements in pulping engines for paper making and
is applicable to such engine as is described in the Specification of my former
Patent No. 1150 of 17th March 1880 but my invention is also applicable to other
kinds of rag engines.
Hitherto pulping engines have been usually constructed with a roller having a
number of knives or bars fixed round its circumference revolving upon or in close
proximity to a fixed block or bottom plate consisting of a number of knives, bars or

page_text: projecting edges; the reduction of the fibrous materials into pulp being effected
during the passage between these moving and fixed bars or knives, each time the
material returns from the back of the roll to its front; the same action being
repeated until the whole contents of the engine have been reduced to the condition
wanted and to complete the said process with the machines at present in use,
generally occupies a number of hours.
My present invention has for its object to reduce the time required for this
process, and I effect this by constructing the engine with two fixed blocks or plates
in lieu of the one bottom plate as hitherto, the material thus being acted upon
twice by the roll every time it revolves against the blocks or plates.
But in order that my said invention may be readily understood and easily carried
into effect I will proceed to describe the same with reference to the accompanying
drawing which is a sectional elevation of an engine constructed in accordance with
my said invention.
Referring to the said drawing I may construct and arrange the roll A, bottom
plate B, and trough C as hitherto, but in addition to the said bottom plate B which
is mounted under the roll A, I mount another plate D preferably in a position as
shown, that is to say between the said plate B and the top of the back fall E which
is suitably formed to receive the plate D; the said plate D being constructed in a
similar manner to the plate B. It will thus be seen that the material after circn-
lating through the passage underneath the back fall E is acted upon by the
roll A. and bottom plate B after passing which it is again acted upon by the same
roll A, and plate D before passing over the back fall E to return again to the front
of the roll, to have the same action repeated until the material has reached the
desired condition.
My said improvements are also applicable to pulping engines in which the
material circulates horizontally, or otherwise, from the back to the front of the
roll.
I do not confine myself to the exact relative positions of the blocks or plates
to the rolls.
The adjustment of the roll to and from the plates simultaneously, may be
effected in any convenient manner.
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 paper pulping engines the arrangement of the one roll working against two
separate blocks or plates substantially as herein before described and shewn in the
accompanying drawing.
Dated this 14th day of December 1809
JOHNSONS,
115, St. Vincent Street, Glasgow, Applicant's Agents.