CERTAIN IMPROVEMENTS IN MACHINERY FOR THE MANUFACTURE OF BOзBIN-NET LACE
Year: 1828

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
LEVERS, of the Town of Nottingham, Machine Maker, send greeting.
WHEREAS His present most Excellent Majesty King George the Fourth, by
His Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Third day of March, One thousand eight hundred and twenty-eight,
in the ninth year of His reign, did, for Himself, His heirs and successors, give
and grant unto me, the said John Levers, His especial license, that I, the said
John Levers, my executors, adñiors, and assigns, or such others as I, the said
John Levers, my executors, admors, or assigns, should at any time agree with,
and no others, from time to time, and at all times, during the term of years
therein expressed, should and lawfully might make, use, exercise, and vend,
within England, Wales, and the Town of Berwick-upon-Tweed, my Invention
of "CERTAIN IMPROVEMENTS IN MACHINERY FOR THE MANUFACTURE OF BOзBIN-NET
LACE;" in which said Letters Patent is contained a proviso, obliging me, the
said John Levers, by an instrument in writing under my hand and seal,
particularly to describe and ascertain the nature of my said Invention, and in
what manner the same is to be performed, and to cause the same to bo
inrolled in His Majesty's High Court of Chancery within four calendar
months next and immediately after the date of the said in part recited Letters
Patent, as in and by the same, reference being thereunto had, will more fully
and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
John Levers, do hereby declare that the nature of my said Invention, and the

page_text: manner in which the same is to be performed, are particularly described and
ascertained in and by the following description thereof (that is to say) :-
My Invention of certain improvements in machinery for the manufacture of
bobbin-net lace, applies to the working of a peculiar construction of machine,
on the circular comb principle, intended to be put in action by rotatory power;
in which machine the bobbin carriages are driven along the combs by the
reciprocating movements of leaves with pinions at the extremities of their
shafts, which pinions take into a pendant circular rack, by the vibrations
of which circular rack the operative parts of the machine are made to
perform.
The object of the present improvement is to give to the said pendant
circular rack such a reciprocating action as shall cause it to drive the bobbin
carriages at intervals, thereby leaving time between each movement for the
shogging of the guide bars, the intention of which is perfectly understood by
persons acquainted with the working of bobbin-net machines.
My present improvement consists in the construction and adaptation of a
certain peculiar form of cam with a vibrating lever, which are designed to give
motion to and direct the actions of the pendant vibrating circular rack, above
mentioned; the mode of constructing and adapting which said improvements
to a rotatory circular comb machine is shewn in the several Figures of the
accompanying Drawings.
Fig. 1 is a front view of a machine upon the rotatory circular comb
principle; Fig. 2 an end view of the same, taken at the right hand; and
Figure 3, a vertical section through the machine, parallel to the last, but seen
from the opposite side, in which three Figures the improved parts are shaded
and coloured, the old parts being shewn in outlines. The machine may be
driven by a winch affixed to the axle of the toothed wheel a, which, taking
into an intermediate wheel 6, causes that to drive the wheel c, fixed upon the
main shaft d. When this machine is to be actuated by the power of steam,
wind, or water, a rigger may be fixed upon the main shaft d, for the purpose of
driving it by a band instead of the winch. Rotatory motion being thus given to
the main shaft d, the cam e and its horn or guide f (both fixed to the wheel c),
are made to revolvo a long vibrating lever g, g, the fulcrum or pivots of which
turn in brackets; h is attached at top by a jointed arm i to the pendant
circular rack k, k, and at bottom carries a friction roller 7, which works in the
groove between the cam and its horn f. It will now be perceived that the
rotation of the cam e will by its excentricity cause the lever g, g, to vibrate
upon its fulcrum pivots, in doing which the arm'i at the upper end of the lever
g will be drawn to and fro, and cause the pendant circular rack k to swing.

page_text: There are pinions m, m, m, m, fixed on the ends of the longitudinal shafts
n, n, n, n, which carry the leaves that take into the indentations made in the
lower part of the bobbin carriages o, o; and the teeth of the circular rack k,
gearing into the pinions m, cause by its swinging action, above described, the
pinions with their shafts and leaves to reciprocate, and consequently to drive
the bobbin carriages to and fro on the circular combs p, p, and thereby to
produce the intervention of threads, in a similar way to that effected by the
ordinary circular comb machine when worked by hand.
In witness whereof, I, the said John Levers, have hereunto set my
hand