Year: 1880

page_text: PROVISIONAL SPECIFICATION left by the said Thomas Blackhurst at the
Office of the Commissioners of Patents on the 4th March 1880.
THOMAS BLACKHURST, of Preston, in the County of Lancaster.
IN JACQUARD LOOMS."
"IMPROVEMENTS
This Invention relates to double lift, dobby, or jacquard mechanism, and consists
in so arranging the rotation of the card barrel or cylinder that only one half the
number of cards ordinarily employed for producing a given pattern is required.
To this end the needles for actuating the hooks are arranged in two sets or rows,
one above the other, each of the cards being correspondingly perforated in double
lines in such manner that one card acts on the two sets of needles, and consequently
on the hooks, operated by both knives. Each succeeding card is presented to the
needles at every alternate pick, and the card barrel or cylinder rotated to the
extent of one quarter of a turn every other pick instead of at every succeeding pick
of the loom as heretofore. The card barrel rotates in end bearings or blocks, which
are free to slide within horizontal slots, the requisite to and fro motion being
received from rocking shafts actuated, through the medium of a connecting rod,
by a crank on the end of the ordinary crank shaft of the loom below. The card
barrel is pulled over or rotated. by means of a catch or hook in the ordinary
manner, but the hook is provided with a finger or projecting part so arranged that
when the projecting extremity of the knife furthest from the card barrel descends
it will come in contact with the finger of the hook, thereby raising it out of action,
and so preventing its actuating the card barrel at that pick of the loom, which
The knives are
takes place when the knife referred to is in its lowest position.
attached to the depending ends of belts passing over pullies fastened upon a shaft
arranged above the dobby, to which motion is given by means of a rack and pinion
arrangement from the tappet shaft below.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Thomas Blackhurst in the Great Seal Patent Office on the 1st
Sentember 1880.
THOMAS BLACKHURST, of Preston, in the County of Lancaster.
"IMPROVEMENTS

page_text: "
number of cards ordinarily employed for producing a given pattern is required
To this end the needles for actuating the hooks are arranged in two sets or rows,
one above the other, each of the cards being perforated in double lines in such
manner that one card acts on the two sets of needles, and consequently on the
hooks operated by both knives. Each succeeding card is presented to the needles
at every alternate pick, and the card-barrel or cylinder is rotated to the extent of
one quarter of a turn, and the next card thereby presented to the needles at every
other pick instead of at every succeeding pick of the loom as heretofore.
In the accompanying Drawings, Fig. 1 is an end view, Fig. 2 a side view, and
Fig. 3 a section shewing the arrangement of my improved dobby or jacquard
.mechanism. a is the card-barrel or cylinder; b, b, are the needles; c, c, the
'hooks; and d, ', the knives. The card-barrel a has intermittent rotary movement
in end bearings or blocks e, which are free to slide within horizontal slots f, the
requisite to and fro motion being imparted from a bell-crank lever or rocking
shaft g actuated through the medium of a conecting rod h by a crank i on the
end of the ordinary crank shaft j of the loom below. The card-barrel a is pulled
over or partially rotated by means of a catch or hook k in the ordinary manner,
but the hook k is provided with a finger or projecting part 7 so arranged that when
the projecting extremity of the knife d¹ descends it will come in contact with the
finger or projecting part 1, thereby raising the hook k out of action (as shewn in
Fig. 4), and so preventing its actuating the card barrel a at that pick of the loom
which takes place when the knife d¹ is in its lowest position. It will be evident
that at each stroke of the card-barrel each card (which is equivalent to two cards
on the design or pattern paper as ordinarily employed), will, according to my
.Invention, operate both the upper and lower sets of needles, thereby actuating both
sets of hooks; but only one set of hooks will be raised, namely, the set which will
be taken up by the ascending knife. The knives d and d¹ are attached to the
depending ends of belts m passing over pulleys n fastened upon a shaft o arranged
above the dobby, to which motion is given by means of a rack and pinion arrange-
ment Ρ from a crank q on the tappet shaft r below, through the medium of the
connecting rods 8, 8, and the lever t.
Having now described the nature of my said Invention, and explained in
what manner the same is to be or may be performed or carried into practical effect,
I would have it understood that what I consider to be novel and original, and
therefore claim as the Invention secured to me under the Letters Patent hereinbefore
in part recited, is as follows,-
1. The improved double lift, dobby, or jacquard mechanism constructed, arranged,
and operating, substantially as herein before described and shewn in the accom-
panying Drawings.
2. Operating, by means of a single card, both sets of hooks in a double lift dobby,
by causing partial rotation of the card barrel or cylinder at each alternate pick
only of the loom, substantially as described.
In witness whereof, I; the said Thomas Blackhurst, have hereunto set my
hand and seal, this Thirty-first day of August, in the year of our Lord
One thousand eight hundred and eighty.