IMPROVEMENTS IN MACHINERY FOR MAKING LACE OR NET, COMMONLY CALLED BOBBIN NET
Year: 1825

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, J, JOHN
HEATHCOAT, of Tiverton, in the County of Devon, Lace Manufacturer, send
greeting.
WHEREAS His most Excellent Majesty King George the Fourth, by
His Letters Patent under the Great Seal of His United Kingdom of Great
Britain and Ireland called England, bearing date at Westminster, the Twelfth
day of January, One thousand eight hundred and twenty-five, did, for Himself,
His heirs and successors, give and grant unto me, the said John Heathcoat,
His especial licence that I, the said John Heathcoat, my exors, admors, and
assigns, or such others as I, the said John Heathcoat, my exors, 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 specified, should and lawfully
might make, use, exercise, and vend, within England, Wales, and the Town
of Berwick-upon-Tweed, my Invention for "IMPROVEMENTS IN MACHINERY FOR
MAKING LACE OR NET, COMMONLY CALLED BOBBIN NET;" in which said Letters
Patent there is contained a proviso obliging me, the said John Heathcoat,
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 be inrolled in His Majesty's
High Court of Chancery within six calendar months next and immediately

page_text: after the date of the said recited Letters Patent, as in and by the same,
reference being thereunto had, will more fully and at largo appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
John Heathcoat, do hereby declare that the nature of my said Invention,
and the manner in which the same is to be performed, are particularly
described and ascertained in and by the Drawings hereunto annexed, and
the following description thereof (that is to say) :-
My Invention consists in certain additions to that kind of machine for
making bobbin net commonly called the circular bolt double tier machine,
and is more particularly applicable to such machine when moved by power,
denominated self-acting or rotary machines. This machine with which my
improvements are incorporated is so well known as not to require any
description; I shall therefore proceed to explain these improvements, and
the manner in which the same are to be applied and used, by the following
description and the Drawings hereunto annexed.
Figure 1 is a front elevation of the machine; 2 is an end elevation; 3 is a
transverse section; 4 represents the carriages in the first position; 5 represents
the carriages in the second position; 6 represents the carriages in the fourth
position; 7 represents the carriages in the fifth position. a represents the driving
shaft, which gives motion to the shafts b, c, which move at equal speeds; d, D, are
two locking bars or fetchers, placed underneath the bolts or arcs of circles e, e,
upon which the carriages n, n, move. These locking bars, by means of rollers,
run upon the curved pieces f. f, and are connected with the upper ends of
the arms g, g, fixed at each extremity of the bars 8, s, to the middle of which
bars are fixed the lower arms t, t, containing the small rollers or friction
wheels h, h, which rest upon the cams i, i. These cams are fixed upon the
shaft 6, in the centre of the machine, and in the same line with the shafts c,
carrying the cams k, k, which give motion to the driving bars 1, 1, by means
of the arms m, m, and the links q, q. When the carriages n, n, are moved
from the first position (Figure 4), by means of the driving bars 1, 2, the
locking bars D, o, are allowed to descend as the carriages advance towards
the second position (Figure 5). The locking bard then takes hold of the car-
riages, and moves them to the third position (Figure 3) with a quick motion,
the driving bars at the same time being made to move at a slower rate;
the first row of the carriages being thus drawn clear out of the guide or warp
threads by the locking bar d, whilst the second row of carriages is held back
by the locking bar D. The operation of changing the guide or warp threads,
commonly called shogging, is at this moment effected without any absolute
pause in the movement of the carriages, and the carriages continue to move

page_text: into the fourth position (Figure 6). The locking barr is now pulled forward
by means of the link p, connected with the upper end of the large arm m.
This link being connected with the locking bar r, about midway betwixt the
axis on which it turns and the edge of the blade which acts against the point
of the carriages, the carriages are caused to move forward out of the guide
threads twice as quick as the driving bars advance, so that by the time the
driving bars are at the extremity of their movement, the carriages are in the
fifth position (Figure 7). The shogging movement being again effected in
the usual manner, the return of the carriages to the first position is accom-
plished by means of a progression of movements precisely similar to those
already described, the locking bars and drivers on the opposite sides of the
machine being alike actuated by the cams in their revolution.
I do not claim the cams k, k, and driving bars 1, 1, as a part of my
present Invention; but I claim only as my Invention the combination of
two additional locking bars or fetchers, and the cams or other contrivances
necessary to move them, with the locking bars and driving bars in common
use in these machines.
The Drawings accompanying the Specification are designed only to illustrate
the new parts of the machine, and their combination with the old parts with
which they are more immediately connected. The mechanical arrangements
for giving motion to the guide bars, point bars, and other parts of the machine
are not introduced into the Drawings, as there are various modes of effecting
such movements in common use, to none of which do I lay claim as a part
of my present Invention.
In further illustration to the form and action of the links p, p, and q, q,
they are represented separately in Fig. 8, by which it will be seen that the
slotted part of the link p is put upon a stud fixed at the extremity of the
arm m, and receives its motion by the action of the stud against the upper
end of the slot. The connection of the arm m with the driving bars 2, l
by means of the link q, is also clearly shown.
In witness whereof, I, the said John Heathcoat, have hereunto set my
hand and seal, the Eleventh day of July, in the year of our Lord
One thousand eight hundred and twenty-five.

page_text: AND BE IT REMEMBERED, that on the Eleventh day of July, in
the year of our Lord 1825, the aforesaid John Heathcoat came before our
said Lord the King in His Chancery, and acknowledged the Specification
aforesaid, and all and everything therein contained and specified, in form
above written. And also the Specification aforesaid was stamped according to
the tenor of the Statute made for that purpose.
Inrolled the Twelfth day of July, in the year of our Lord One thousand
eight hundred and twenty-five.