AN IMPROVEMENT IN LOOMS
Year: 1874

page_text: LETTERS PATENT to John Byrd, of Dudbridge, near Stroud, in the
County of Gloucester, Mechanical Engineer, for the Invention of
"AN IMPROVEMENT IN LOOMS."
Sealed the 13th May 1875, and dated the 3rd December 1874.
PROVISIONAL SPECIFICATION left by the said John Byrd at the
Office of the Commissioners of Patents, with his Petition, on the
3rd December 1874.
.
I, JOHN BYRD, of Dudbridge, near Stroud, in the County of Gloucester,
Mechanical Engineer, do hereby declare the nature of the said Inven-
tion for "AN IMPROVEMENT IN LOoмs," to be as follows:-
The object of this Invention is to obtain the beat-up motion in looms
by a more simple and efficient means than is at present employed. - To
this end I employ a cam for giving the throw to the batten. This cam
when a double beat is required I make heart shaped, and I mount it on
a driving shaft which passes through slotted guides made in the sides of
a looped link or rod that is jointed to the batten.. Within this looped
link is mountod a bowle upon which the heart cam bears. The cam is

page_text: made with a double flanged periphery, and on the inner side of this
flange two small bowles are caused to bear. These bowles are carried
by short links which are free to rock on the axle of the first-mentioned
bowle, and the flange of the cam is thus embraced by the bowles. If
now rotary motion is given to the cam it will rock the batten and
produce the beat-up motion required, the forward pressure of the cam
being on the main bowle and the back pressure (to bring back the
batten) being upon the small bowles.
If a single beat up is required I make the cam egg instead of heart
shaped, but in other respects I construct and fit it as described for the
double beat up.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Byrd in the Great Seal Patent Office on
the 3rd June 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN BYRD,
of Dudbridge, near Stroud, in the County of Gloucester, Mechanical
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Third day of December, in the year
of our Lord One thousand eight hundred and seventy-four, in the
thirty-eighth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said John Byrd, Her special
licence that I, the said John Byrd, my executors, administrators,
and assigns, or such others as I, the said John Byrd, my executors,
administrators, 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 IMPROVE-
MENT IN LOOMS," upon the condition (amongst others) that I, the said
John Byrd, my executors or administrators, 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

page_text: to be filed in the Great Scal Patent Office within six calendar monthis
next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Byrd, do hereby declare
the nature of my said Invention, and in what manner the same is to bc
performed, to be particularly described and ascertained in and by the
following statements, reference being had to the Drawing hereunto
annexed, and to the letters and figures marked thereon (that is to
say)
:-
This Invention relates to novel means for obtaining the beat-up
motion in looms whereby the excessive wear and tear now experienced
will be prevented, and a much smoother action of the beat-up cam will
result. To this end I employ a double flanged cam (either heart shaped
or egg shaped, according to circumstances) for giving the throw to the
batten, mounting it on a driving shaft which passes through slotted
guides made in the sides of a looped link or rod that is jointed to the
batten and embraces the cam. Within this looped link is mounted a
bowle upon which the cam bears. On the axle of this bowle swing two
links which carry small bowles that are caused to bear against the inner
face of the flanges of the cam, which flanges are thus embraced by the
bowles. If now rotary motion is given to the cam it will rock the
batten and produce the beat-up motion required, the forward pressure of
the cam being on the main bowle and the back pressure (to bring back
the batten) being upon the small bowles.
In the accompanying Drawing Fig. 1 shows in plan view my improve-
ment as applied to the batten of a loom, and Fig. 2 is a side clevation of
the same, partly in section; and Figures 3 and 4 are sectional elevations
illustrating the action of the "beat up." In these Figures A is the
batten, to which is hinged a compound link rod B, through slots in the
sides of which the driving shaft C passes; this shaft is mounted in
brasses c, c, which slide in the slots formed through the sides of the link
rod, and upon the shaft is keyed the flanged cam D. In this example
the cam is made heart shaped to enable it to impart a double beat-up
motion to the batten. E is a bowle mounted loosely on a pin that is
made fast to the sides of the link rod; and F, F, are links hanging
loosely on the pin and carrying each a small bowle G. The bowle E it
will be seen is set in contact with the flanged perimeter of the cam, and
the bowles G are set within the flanged perimeter, but not so close to
the flanges as to prevent the links F, F, having froo play.

page_text: Referring now to Fig. 2, which shews the batten in its extreme back-
ward position, it will be understood that if rotary motion is given to the
driving shaft in the direction of the arrow the cam D will by presenting
its increasing radius to the bowle E force forward the batten to beat up
the weft thread last thrown by the shuttle.
As the cam leaves the position of Fig. 2 the bowles G will drop, and
not until the part 1 of the cam is brought into action will they have any
tendency to rise, but as the cam passes through the two positions indicated
at Fig. 3 the bowles G will also move into the two positions of Fig. 3,
and thereby ease the passage of the cam between the bowles E and G.
Fig. 4 shews the intermediate position of the cam between the two
beats up, at which time the bowles G are in action to effect the back
movement of the batten preparatory to the second beat up. When by
the continued rotation of the cam the part 2 is brought into action the
bowles G will through their loose links be free to repeat the motions
indicated at Fig. 3, and thereby ensure the smooth action of the cam
during the passage of the sharp curves over the bowles.
It will be understood that when a single beat up is required I make
the cam egg instead of heart shaped, but in other respects I construct
and fit the cam as described for the double beat
up.
Having now set forth the nature of my Invention of "An Improve-
ment in Looms," 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 transmitting
the "
beat-up" motion of the cam to the batten.
In witness whereof, I, the said John Byrd, have hereunto set my
hand and seal, the Thirty-first day of May, in the year of our
Lord One thousand eight hundred and seventy-five.