IMPROVEMENTS IN MACHINERY FOR THE MANUFACTURE OF LACE
Year: 1868

page_text: PROVISIONAL SPECIFICATION left by Clinton Edgcumbe Brooman
at the Office of the Commissioners of Patents, with his Petition,
on the 23rd March 1868. - A communication from abroad by
Désiré Sival and Léon Sival, both of Roubaix, France.
I, CLINTON EDGCUMBE BROOMAN, of the Firm of Robertson, Brooman,
and Company, of 166, Fleet Street, in the City of London, Patent
Agents, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN MACHINERY FOR THE MANUFACTURE OF LACE," to be as
follows:-
In the Specification of Letters Patent, dated 19th April 1865,
No. 1087, granted to Richard Archibald Brooman, for improvements
in machinery for the manufacture of lace, communicated to him
by the present Inventors Desiré Sival and Leon Sival, it was stated
that "for fabrics strengthened or doubled in embroidery as in those
strengthened in embroidery and in warp, two points for every carriage
"will be necessary to lift conveniently all the twists, and the thread
"in this case will issue at the centre of its carriage, and will pass
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page_text: "between two points." Now it has been found that the application
of this principle gives good results in regularity and perfection of work,
and it is the object of the present Invention to develop or carry out
the principle.
In order to explain the Invention I will state shortly the different
ways in which the raising of the twists is usually effected. Thus in
lever machines the thread issues at the side of the carriage, and the
corresponding point which is above the carriage and in its axis can raise
the twist only when it is produced by a warp thread situated at the side
opposite to that of the issue of the bobhin thread; the twists are
therefore not taken in proportion to their formation, the drawing or
tightening is effected irregularly; and the threads are puffed out at the
part where they join the fabric; it even happens that the raising of
the twist ordinarily lifted begins to slip or fail, and then two points
are employed for every carriage, but one of them serves only to replace
the first in the case where the bars being badly regulated the first has
not fulfilled its function; this is therefore only so to speak a point of
precaution, and if it insures the raising of the twists at the right, for
example, it contributes nothing to the lifting of the twists at the left.
These inconveniences are removed by the present Invention, which by
causing the thread to issue at the centre of the carriage and keeping
it separated between two points, necessarily insures the raising of the
twists as they are produced by the warp thread at the right or at the left
of the carriage. For this purpose I form on one face of the carriage
a notch communicating with the ordinary furrow or groove formed on
the other face by a hole or eye through which the thread passes; it is
owing to this notch that the thread on leaving the bobbin preserves
its perfectly rectilinear direction, and issues vertically in the central
axis of the carriage. I combine with this notch the employment of bars
with a greater number of points calculated to form two points for every
carriage.
I may remark that in some circular machines there are carriages
formed with notches, but these are for the object of diverting (noyer)
the thread, which so far from issuing at the centre of the carriage. the

page_text: is to say, quite in another manner and for a totally different object to
that of the present Invention. Besides, this notch which does not
permit of the separated passage of the thread, has never been com-
bined with the employment of two points for every carriage, and
it is this combination which constitutes the essential feature of this
Invention.