IMPROVEMENTS IN MACHINERY OR APPARATUS KNOWN AS JACQUARDS AND DOBBIES
Year: 1883

page_text: LETTERS PATENT to William Davenport and William Crossley both of
Failsworth in the County of Lancaster for an Invention of "IMPROVEMENTS
IN MACHINERY OR APPARATUS KNOWN AS JACQUARDS AND DOBBIES "
PROVISIONAL SPECIFICATION left by the said William Davenport and
William Crossley at the Office of the Commissioners of Patents on the
18th May 1883.
WILLIAM DAVENPORT and WILLIAM CROSSLEY both of Failsworth in the
County of Lancaster " IMPROVEMENTS IN MACHINERY OR APPARATUS KNOWN AS
JACQUARDS AND DOBBIES
"
This invention.relates to improvements in apparatus to be applied to looms for
weaving known as Jacquard machines and Dobbies and is designed to save labor
and cards and to enable the machine to weave different patterns (say cross borders
and middle) of cloth without the necessity for changing the pattern cards by hand
as hitherto
•
The invention consists in the use of an additional or auxiliary set of short
needles which are acted upon by a separate pattern barrel or cylinder placed at
the side of the machine, above the ordinary needles, and which correspond in
number, and are connected there with by short levers depending therefrom.
Eyes or twirls are formed in these auxiliary needles through which the short
levers pass; these levers are bent at right angles at the top to prevent them falling.
through the eyes: the other ends of the levers pass through corresponding eyes
in the ordinary needles beneath, which are connected with and act upon the drop
hooks.
Bars are fixed in a bracket which pass across the levers and serve as the fulcra
upon which these levers turn, and being connected to both sets of needles pull their
respective drop hooks off the knives or griff bars as required
Thus instead of changing the pattern cards by hand as hitherto, when it is
desired to weave (say) a cross border, the operative has merely to stop the
ordinary cylinder, and put the auxiliary pattern cylinder (which is actuated
independly of the other by suitable mechanism) in gear, when the required result
will be obtained.
The above arrangement is described as applied to Jacquard machines, but it will
be evident that with slight alterations the same can also readily be applied to
Dobbies.

page_text: -
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Davenport and William Crossley in the Great Seal Patent
Office on the 17th November 1883.
WILLIAM DAVENPORT and WILLIAM CROSSLEY both of Failsworth in the
County of Lancaster IMPROVEMENTS IN MACHINERY OR APPARATUS KNOWN AS
JACQUARDS AND DOBBIES
This invention relates to improvements in apparatus known as Jacquard
machines and Dobbies to be applied to looms for weaving and is designed to save
labor and pattern cards and to enable the machine to weave different patterns (say
cross borders and middle) of cloth without the necessity for changing the pattern
cards by hand as hitherto.
Such being the nature and object of our said invention we will now proceed to
describe in detail the manner in which the same is to be or may be performed or
carried into practical effect, and in order that the same may be clearly understood
we have annexed hereunto a sheet of drawings illustrative thereof and have
marked the same with figures and letters of reference corresponding with those in
the following explanation thereof.
In the annexed drawing Fig. 1. is a vertical section of so much of a Jacquard
machine as is necessary to illustrate our invention and Fig. 2 is an end elevation
of the same (drawn to a smaller scale) showing the methiod of actuating the
cylinders as hereinafter described.
a, a is the framing of the machine b, 6 the ordinary perforated cylinder, c, c the
ordinary needles d, d the spring box, e, e the hooks, and f, f the knives or
griff bars.
The invention consists in the use of an additional or auxiliary set of short
needles g, g which are acted upon by a separate pattern barrel or cylinder h, h
placed at the side of the machine above the ordinary needles c, c and which
correspond in number, and are connected therewith by short levers i, i depending
therefrom. Eyes or twirls are formed in these auxiliary needles through which
the short levers i, i pass: these levers are bent at right angles at the top to:
prevent them from falling through the eyes; the other ends of the levers i, i pass
through corresponding eyes or cranks in the ordinary needles c, c beneath, which
are connected with and act upon the drop hooks e, e.
Bars*
* are fixed in a bracket k, k which pass across the levers i, i and serve
as the fulcra against which these levers i, i work and being connected to both sets
of needles c, c and g, g pull their respective drop hooks e, e off the knives or griff
bars f, fas required (see dotted lines in Fig. 1).
Thus instead of changing the pattern cards by hand as hitherto done, when it
is desired to weave (say) a cross border, the operative has merely to stop the
ordinary cylinder and to put the auxiliary pattern cylinder in gear when the s
required result will be obtained.
This change can be effected by any suitable simple mechanism, but the
arrangement which we have shown on the annexed drawing is one which we have
found to work satisfactorily.
The ordinary cylinders b, b and the auxiliary cylinder h, h are each carried in a 4
hanging frame 1, and 1, is caused to swing to and fro by means of a bell
crank lever m, m and mx, mx. The adjacent ends of the horizontal arms of
these levers are provided with open slots (see Fig. 2) into one or other of which the
end of a lever n, n gears. This lever has a rising and falling motion given to it
by a rod or otherwise from any convenient moving part of the loom. This

page_text: lever n, n is mounted on a sliding bracket p, p which can be moved in either
direction by a hand lever q, q so as to throw the end of the lever n, n into one or
other of the open notches of the bell crank levers m, or m*
The hand lever q, q works against a fixed bracket r, r provided with two
notches (see Fig. 1.) whereby the lever n, n may be kept for any required length
of time in gear with either m, or m*.
8, 8 are two weighted levers for the purpose of holding the cylinder, which is not
working, out of the reach of the ends of the needles.
The above arrangement is shown on the drawing and described as applied to a
Jacquard machine, but it will be evident that with slight alteration the same can
be as readily adapted to " Dobbies."
Having now described the nature and object of our said invention together with
the manner in which the same is to be or may be performed or carried into practical
effect we wish it to be understood that we claim as our invention the combination
with the needles of a Jacquard machine or Dobby of a set of auxiliary needles and
an auxiliary cylinder substantially in the manner and for the purposes hereinbefore
more particularly set forth and described.
In witness whereof we the said William Davenport and William Crossley have
hereunto set our hands and seals this fifteenth day of November in the year of
our Lord one thousand eight hundred and eighty three
WILLIAM DAVENPORT (L.D.)
WILLIAM CROSSLEY
(L.S.)