IMPROVEMENTS IN THE MODE OF AND APPARATUS FOR MANUFACTURING MACHINE MADE LACE
Year: 1879

page_text: LETTERS PATENT to Emile Louis Davenière, of Saint Pierre-les-Calais, in the
French Republic, for the Invention of "IMPROVEMENTS IN THE MODE OF
AND APPARATUS FOR MANUFACTURING MACHINE MADE LACE."
COMPLETE SPECIFICATION filed by the said Emile Louis Davenière at the
Office of the Commissioners of Patents on the 16th April 1879.
EMILE LOUIS DAVENIERE, of Saint Pierre-les-Calais, in the French Republic.
"IMPROVEMENTS IN THE MODE OF AND APPARATUS FOR MANUFACTURING MACHINE
MADE LACE."
My Invention relates to improvements in the mode of and apparatus for manu-
facturing machine made lace, and has for its object to permit of maintaining at will
the warp thread at any given point of the space comprised between the hooks or the
edges of the "stumb bar" apertures whatever may be the mode of piercing the
latter. The distinguishing feature of this process is that it combines in one piece of
work two independent stumb bars operating one and the same thread; the first of
these bars regulating the movement of the thread between the hooks or the edges
of the perforations of the second, and vice versa. To this end I apply by super-
position to a stump bar, either perforated or provided with hooks, a second per-
forated or hook stumb bar, (as the case may be), forming counterpart, and so arranged
as to permit of passing the warp thread through the corresponding apertures of both.
By the intervention of the fine bars and by the combined play of the coupled stumb
bars, each moving slightly to right or left and working either jointly or separately,
the warp thread may be steadily and regularly conducted to any point of the interval
comprised between the hooks or the aperture edges of the stumb bars and be main-
tained in the position thus given during the passage of the carriages.
The same process may be applied, not only to single but also to compound stumb.
bars, to which latter a corresponding number of independent stumb bars may always
be added to regulate the movement of the threads in the manner above described.
Hitherto the warp thread conducted by the fine bars was invariably brought against
the hooks or the edges of the stumb bar apertures at the moment of the passage of
the carriage between the threads, the consequences being that it was impossible at
this precise moment to maintain steadily the warp at any given point of the space
between the hooks or the edges of the apertures. This defect (that is to say,
absence of regular and uniform fixity of the warp thread in the said space) neces-
sitated for the production of certain ground and other effects, the employment of a
Drine 271
the

page_text: multiplicity of independent bars, whereas the application of my system permits
of such effects being obtained while doing away with the greater number of these
bars.
Having thus described and ascertained the nature of the said improvements and
the manner in which they are or may be carried into effect, I would have it under-
stood that I do not confine myself to the precise details above laid down, as these
may to a certain extent be varied without deviating from the principle or main
features of my Invention."
But what I claim and desire to protect by Letters Patent is, the application in the
manufacture of machine made lace of two superposed "stumb" bars provided with
either perforations or hooks, and working one and the same warp thread, the
first of these bars regulating the movement of the latter between the apertures
or hooks of the second, and vice versd, the whole arranged and operated in manner
and for the purposes substantially as herein set forth.
In witness whereof, I, the said Emile Louis Davenière, have hereunto set
my hand and seal, this Fifteenth day of April, in the year of our Lord
One thousand eight hundred and seventy nine.
EMILE LOUIS DAVENIERE. (L.S.)