IMPROVEMENTS IN BOBBIN NET MACHINES
Year: 1874

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane,
in the County of Middlesex, Patent Agent, for the Invention of
"IMPROVEMENTS IN BOBBIN NET MACHINES." -A communication from
abroad by Julien Gérard, of Lyons, France.
Sealed the 28th May 1875, and dated the 12th December 1874.
PROVISIONAL SPECIFICATION left by the said Alexander Melville
Clark at the Office of the Commissioners of Patents, with his
Petition, on the 12th December 1874.
I, ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County
of Middlesex, Patent Agent, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN BOBBIN NET MACHINES,". to be as
follows:-
'
The object of the present Invention is to dispense with the means
hitherto employed to prevent the carriages being drawn out of the bolts
or combs while the thread is being unwound, and it consists of an
improved construction of pusher, which also serves to retain the carriage
in the comb.

page_text: In the accompanying Drawing Figure 1 is a transverse vertical section
of a bobbin net frame, showing a carriage operated by the improved
pushers above mentioned..
Figure 2 is a similar section, showing the means by which the pushers
are caused to retain the carriages.
Figure 3 shows a view of the improved carriage.
The same reference letters apply to all three Figures.
A crank shaft driven by a belt on pulley B and imparting alternate
circular motion to the pushers C through connecting rods D. The
system of pushers is composed of two bars E, on which are fixed the
pushers proper F; and the said bars E are supported at their ends by
the two armed levers G oscillating on an axis g fixed between a pair of
levers H hung on an axis h, upon which the whole system swings or
osscillates to traverse the carriages I from one bolt or comb J to the
other, as usual. The carriages are of dovetailed form, as shown, and are
held down by the pushers which abut against their back and front edges
at a certain moment which is timed by the low part k of cam K. The
carriages are thus retained and prevented from being raised out of the
comb by the tension of the thread in unwinding. The pushers are
caused to release the carriages when the cam surface k of cam K
osscillates a lever L pivoted at 7 and having a friction bowl at one end
in contact with the cam, the other end being jointed by a slotted con-
nection m to connecting rods M, which are jointed to levers G. When
the long arms of levers L are depressed by the cams the short arms
raise the connecting rods M which oscillates lever G, and so move the
pushers away from the carriages to give passage to the warp threads,
and also to admit of taking out and replacing the carriages when the
bobbins are empty.
By the above improvements I am enabled to dispense with the locker
plates ordinilary employed, and so to drive the machine at a higher
snood

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Alexander Melville Clark in the Great Seal Patent
Office on the 11th June 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of December, in the year
of our Lord One thousand eight hundred and seventy-four, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Alexander, Melville Clark, Her special licence
that I, the said Alexander Melville Clark, my executors, administrators,
and assigns, or such others as I, the said Alexander Melville Clark,
my executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN BOBBIN NET MACHINES," a communication to me
from abroad by Julien Gérard, of Lyons, France," upon the condition
(amongst others) that I, the said Alexander Melville Clark, my exe-
cutors or administrators, by an instrument in writing under my, or
their, or one of their hands and scals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the
same was to be performed, and cause the same to be filed in the Great
Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
..
NOW KNOW YE, that I, the said Alexander Melville Clark, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement, reference being had to the accompanying
Sheet of Drawings, and to the letters and figures marked thereon (that is
to say):

page_text: form shown in Figure 4. The carriages are thus retained and prevented
from being raised out of the comb by the tension of the thread in
unwinding. The pushers are caused to release the carriages when the
cam surfaces of cams K oscillate levers L pivoted at 2 and having
friction bowls at one end in contact with the cams, the other ends
being jointed by slotted connections m to connecting rods M, which
are jointed to levers G. When the long arms of levers L are depressed
by the cams the short arms raise the connecting rods M which oscillate
levers G, and so move the pushers away from the carriages to give
passage to the warp threads, and also to admit of taking out and
replacing the carriages when the bobbins are empty.
The distinguishing features of the Invention thus consist in dispensing
with the groove ordinarily made near the bottom of the carriage for the
purpose of retaining it in the bolt and effecting the same object by
the aid of the pushers which hold the carriage between them, and by
reason of its dovetailed form prevent it rising; in dispensing with the
locker plates or their equivalent, and with the heels or catches on the
carriages, whether above or below the combs, the improved carriage
being retained and operated entirely by the pushers; in the constant
action of the two pushers (front and back) on the system of carriages
by means of the mechanism described, a short interval being left for
changes of direction to permit of the shifting of the warp threads
between the combs in the longitudinal direction of the frame; by
reason of the improved form of carriage and the action of the pushers,
herein-before described, the locker plates are dispensed with, thus
simplifying the machine and enabling it to be driven at very high
speeds, and so increase its productiveness.
Having described the nature of the Invention, and the manner of
performing the same, I declare that what I claim as the Invention to be
protected by the herein-before in part recited Letters Patent is,-
1st. The employment in combination with carriages of the dovetailed
form, herein shown and described, of pushers, adapted not only to
traverse the carriages from one bolt to the other, but also to hold the
carriages between them and retain the same in the combs or bolts, sub-
stantially as set forth, whereby grooves in the carriages are dispensed

page_text: 2nd. Operating the pushers, as herein shown and described, so that
the lockers usually employed, and consequently the catches on the
carriages, may be dispensed with, the pushers being also made to release
the carriages at intervals, as and for the purpose set forth.
+
In witness whereof, I, tho said Alexander Melville Clark, have 5
hereunto set my hand and seal, this Eleventh day of June,
in the year of our Lord One thousand eight hundred and seventy-
five.
A. M. CLARK. (L.S.)