Ax IMPROVEMENT IN THE CONSTRUCTION OF SCREW GILL MACHINERY
Year: 1872

page_text: LETTERS PATENT to Arthur Greenwood, of Leeds, in the County of
of York, Machine Maker, for the Invention of "Ax IMPROVEMENT
IN THE CONSTRUCTION OF SCREW GILL MACHINERY."-A communication
Sealed the 26th November 1872, and dated the 6th June 1872.
PROVISIONAL SPECIFICATION left by the said Arthur Greenwood at
the Office of the Commissioners of Patents, with his Petition, on
the 6th June 1872.
I, ARTHUR GREENWOOD, of Leeds, in the County of York, Machine
Maker, do hereby declare the nature of the said Invention for "AN
IMPROVEMENT IN THE CONSTRUCTION OF SCREW GILL MACHINERY," to be as
follows:-
―:
This Invention relates to improved means for effecting the transference
In place of
of gill bars or fallers from the lower to the upper screws.
the ordinary lifting cams there is formed on or fitted to each of the lower
screws a collar of as large a diameter as the centres of the upper and

page_text: lower screws will admit of. The thread of the screw is continued into
the collar, and the groove thus formed is carried round nearly the whole
of one turn. The latter portion, however, of this groove runs parallel
with the sides of the collar, and the closed end of the groove constitutes
the lifting cam. Thus the gill bar or faller in its back traverse enters
the groove of the collars, and is steadied on both sides by the collars
while it is being lifted into the thread of the upper screws. This arrange-
ment ensures the lifting and guiding of the fallers exactly into the thread
of the upper screws, and prevents them from striking against the edges
of the threads and damaging them, as is frequently the case in the usual
arrangement.
By this Invention the use of spring guides or lever guides for guiding
the fallers in their upward motion is altogether dispensed with.
Another advantage consequent on the fact that the lifting cams are
not required to enter the thread of the upper screw is, that the threads
of the upper screws will retain their original or proper thickness instead
of being reduced in strength, as is commonly the case. The lifting cams
or incline in the collar raise the fallers partially into the thread of the
upper screws and they are then raised as they advance to their required
height by means of an incline shaped on the end of the slide bars or
table upon which the fallers travel, and thus their gills enter into and
act upon the fibres.
The collars formed upon the bottom screw may be made in one solid
piece with the screw or separate therefrom, as may be most convenient.
The arrangement above described may be applied also to the double or
intersecting screw gill preparing machinery.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the sixth day of June, in the year of
our Lord One thousand eight hundred and seventy-two, in the thirty-
fifth year of Her reign, did, for Herself, Her heirs and successors, give
5. and grant unto me, the said Arthur Greenwood, Her special licence that
I, the said Arthur Greenwood, my executors, administrators, and assigns,
or such others as I, the said Arthur Greenwood, my executors, adminis-
trators, and assigns, should at any time agree with, and no others, from
time to time and at all times thereafter during the term therein expressed,
should and lawfully might make, use, exercise, and vend, within the
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "AN IMPROVEMENT IN THE CONSTRUCTION
OF SCREW GILL MACHINERY," being a communication to me from abroad by
Auguste Veillon, of Basle, Switzerland, upon the condition (amongst
others) that I, the said Arthur Greenwood, my executors or adminis-
trators, by an instrument in writing under my, or their, or one of their
hands and seals, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date
of the said Letters Patent.
NOW KNOW YE, that I, the said Arthur Greenwood, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement, reference being had to the Drawing hereunto
annexed, and to the letters and figures marked thereon (that is to say) :-
This Invention relates to improved means for effecting the transfer-
rence of gill bars or fallers from the lower to the upper traversing
screws. In place of the ordinary lifting cams there is formed on or
fitted to each of the lower screws a collar of as large a diameter as the
centres of the upper and lower screws will admit of. The thread of the
screw is continued into the collar, and the groove thus formed is carried
round nearly the whole of one turn. The latter portion, however, of this
groove runs parallel with the sides of the collar, and the closed end
of the groove constitutes the lifting cam. Thus the gill bar or faller in
its back traverse enters the groove of the collars, and is steadied on
both sides by the collars while it is being lifted into the thread of
the upper screws.

page_text: In the accompanying Drawing Fig. 1 shews in side elevation one of
a pair of upper and lower traversing screws. Fig. 2 is a cross section
of the same, shewing the slides and the gill bars or fallers in connection
with the screws.
A is the upper screw for giving the forward traverse to the gill bars,
and B is the lower one for imparting the back traverse thereto. Formed
upon or fitted to this screw B is the collar C, the diameter of which
is limited by the space allowed for its rotation, clear of the upper
screw A.
By reference to Fig. 1 it will be seen that the collar is grooved
This
diagonally so as to form a continuation of the thread of the screw.
diagonal grooving of the collar is continued until the groove reaches
the vertical plane in which the thread of the screw A terminates. The
groove then runs at right angles to the axis of the screw until it
is terminated by the part C¹, Fig. 1, which constitutes the lifting cam.
This cam is shewn in Fig. 1 in the position in which it commences to
lift the gill bars, and in the transverse sections, Fig. 3, it is shewn
as having completed its action. Fig. 4 shews the grooved collar in
plan view, with the end of the gill bar inserted therein. This arrange-
ment it will be seen ensures the lifting and guiding of the gill bars or
fallers exactly into the thread of the upper screws, and prevents them
from striking against the edges of the threads and damaging them, as is
frequently the case in the usual arrangement.
By this Invention the use of spring guides or lever guides for guiding
the fallers in their upward motion is altogether dispensed with.
Another advantage consequent on the fact that the lifting cams are
not required to enter the thread of the upper screw is, that the threads of
the upper screws will retain their original or proper thickness instead of
being reduced in strength, as is commonly the case.
The lifting cams of the collars do not, as will be seen by reference to
Fig. 3, raise the fallers to their full height in the thread of the upper
screws. This is, however, effected as they advance by means of an
incline shaped on the end of the top slide or table upon which the
fallers travel. This slide or table is shewn in red at D, Fig. 1,
and also at Fig. 5, in which latter Figure the fallers E, E, are shewn
as passing up the incline and rising to their required height for entering
into and acting upon the fibres.

page_text: The collars C may be made in one solid piece with the screw or (as
shewn in the Drawing) separate therefrom according to the convenience
of the machine maker.
The arrangement above described may be applied also to the double or
intersecting screw gill preparing machinery.
Having now set forth the nature of the Invention of "An Improvement
in the Construction of Screw Gill Machinery," and explained the manner
of carrying the same into effect, I wish it to be understood that under the
above in part recited Letters Patent I claim, the arrangement above
described for lifting gill bars or fallers, and guiding them in their ascent
into the threads of the upper screws.
In witness whereof, I, the said Arthur Greenwood, have hereunto
set my hand and seal, the Fourth day of December, in the year
of our Lord One thousand eight hundred and seventy-two.
ARTHUR GREENWOOD. (L.S.)