IMPROVEMENTS IN PAPER MAKING MACHINES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, WILLIAM LEISHMAN, of Two Waters Mill, Hemel-Hempstead, in the County
of Herts, Paper Maker's Foreman, do hereby declare the nature of said Invention
for "IMPROVEMENTS IN PAPER MAKING MACHINES' " to be as follows:-
My Invention has for its object to so construct or arrange paper making
machines that paper is produced therefrom without the objectionable wire mark
at back which results from the pressure of the upper couch roll when the said
machines are arranged in the ordinary manner.
According to my Invention I dispense with the upper couch roll and employ in
place thereof an endless felt passing over suitable guides or rollers so that it comes
into contact with the web or layer of pulp as it passes over the lower couch roll.
At the back of this felt at this part is situated a suction box or exhausting device.
by which tbo web or layer of pulp is drawn from the wire and caused to adhere to.
the felt. The said web or layer of pulp is then carried by the said felt on to the
ordinary first press felt, a suction box or exhausting device causing the said layer.
to adhere to the said first press felt. The web or layer of pulp then proceeds
through the machine and may be finished in the ordinary way.
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, London,
Agent for the said William Leishman.

page_text: I WILLIAM LEISUMAN of Two Waters Mill Hemel Hempstead in the County of
Herts, Paper Makers Foreman do hereby declare the nature of my invention for
" and in what manner the same is
"IMPROVEMENTS IN PAPER MAKING MACHINES
to be performed, to be particularly described and ascertained in and by the
following statement :—
My Invention has for its object to so construct or arrange paper making machines
that paper is produced therefrom without the objectionable wire mark at back
which results from the pressure of the upper couch roll when the said machines aro
arranged in the ordinary manner, a further advantage being that the paper web
is not injuriously stretched in passing from the wire cloth to the succeeding rollers.
I will explain my Invention with reference to the accompanying drawing which
represents in elevation so much of a paper machine as is necessary to illustrate my
improvements. I dispense with the upper couch roll and employ in place thereof
an endless felt a passing over guides or rollers-b arranged in any suitable manner
and with any suitable cleaning devices such for example as those shewn at ; said
web a comes into contact with the web or layer of pulp c as it passes over the
lower couch roll & At the back of the felt a preferably over or nearly over the
said couch roll d is situated a suction box or exhausting device e, which may be of
ordinary construction, by which the web or layer of pulp is drawn from the
The said web or layer
ordinary wire cloth f and caused to adhere to the felt a.
of pulp c is then carried by the said felt a onto the ordinary first press felt g. A
suction box or exhaustion device may advantageously be used as indicated at h for
felt g and prevent
causing the said layer of pulp c to adhere to the said first press
the said layer following the web a. The web or layer of pulp c then proceeds
through the machine and may be finished in the ordinary way.
Having now 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
First. In paper making machines the combination of a roller over which the web
or layer of pulp passes when on the wire cloth, an endless felt which comes in
contact with the said web or layer, and a. suction box or exhausting device by
which the web or layer of pulp is drawn from the wire and caused to adhere to the
felt, all substantially as and for the purpose herein before described with reference
to the accompanying drawings.
Second. In paper making machines the combination of a roller over which the
web or layer of pulp passes when on the wire cloth, an endless felt which comes in
contact with the said web or layer, and suction boxes or exhausting devices by
which the web or layer of pulp is first drawn from the wire and caused to adhere
to the said felt, and is afterwards drawn on to the ordinary first press felt,
substantially as and for the purpose herein before described with reference to the
accompanying drawings.
nated thin 92- doy of December 1884.