IMPROVEMENTS IN JACK-BARS
Year: 1884

page_text: JAMES CARVER, of the town and county of the town of Nottingham, and
JOSEPH ROE, of Basford in the same county, machinists do hereby declare the
nature of our invention for "IMPROVEMENTS IN JACK-BARS," to be as follows:
Heretofore the jacks or selectors in jack bars employed in warp lace machines,
have been raised by lengths of twine attached to them, and to the needles of the
jacquard operating them, and when raised by the jacquard, the jacks being light,
have frequently remained so raised, when they ought to have fallen by their own
weight to be ready for a fresh selection, and to ensure them falling, a bar the
length of the machine has been employed to drive the jacks down, the said bar
bas received its motion from the jacquard.
Our improved jack bar consists of a bar of suitable shape, either forming two
sleys or having two sleys attached to it in which the jacks slide, each jack is
provided with a spring which is helically coiled round it for a portion of its length,
one end of the spring presses upon. a collar on the jack or on a stud projecting
from its side, the opposite end of the spring presses against the sley nearest to the
jacquard. By such means after each selection of the jacks as the jacquard needles
fall, each jack is brought to its relative position by its spring ready for a fresh
selection without baving to employ a falling bar, this arrangement of jack enables
us to employ jacquard string to connect each jack to a needle of the jacquard;
and by dispensing with the falling bar, more room and easier access to the machine
is obtained, the self-acting jack also enables the machine to be driven at a greater
speed, than heretofore.

page_text: We, JAMES CARVER, of the town and county of the town of Nottingham, and
JOSEPH ROE, of Basford in the same county, Machinists, do hereby declare the
nature of our invention for "IMPROVEMENTS IN JACK BARS," and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
- Figure 1 is a front view of portion of a jack bar, and
Figure 2, a sectional view of the same, both shewing our improvements applied
thereto.
Heretofore the jacks or selectors in jack bars employed in warp lace machines
have been raised by lengths of twine attached to them, and to the needles of the
jacquard operating them, and when raised by the jacquard, the jacks being light
have frequently remained so raised, when they ought to have fallen by their own
weight, to be ready for a fresh selection. To ensure them falling, a bar the length
of the machine has been employed to drive the jacks down, the said bar receiving
its motion from the jacquard. Our improved jack bar consists of a bar A, of
Buitable shape either. forming two sleys B and C, or having two sleys attached to
it, in which the jacks D slide, but we do not confine ourselves to the shape of the
jacks shewn, each jack being provided with a spring E, which is helically coiled
round it for a portion of its length between the two sleys, the lower end of the
spring presses upon a collar on the jack, or as shewn in the drawings on the
projecting arm, to which the spring F from the jacquard is secured, the upper end
of the spring presses against the sley nearest to the jacquard. By such means,
after each selection of the jacks, as the jacquard needles fall, each jack is brought
to its relative position by its spring ready for a fresh selection, without having to
employ a falling bar. Such arrangement of jacks enables us to employ a strong
jacquard string to connect each jack to a needle of the jacquard, and by
dispensing with the falling bar, more room and easier access to the machine is
obtained, the self acting jack also enables the machine to be driven at a greater
speed than heretofore.
Having now particularly described and ascertained the nature of our said
Invention, and in what manner the same is to be performed,
We claim the spring E helically coiled round each jack or selector in the jack
bars employed in warp lace machines, substantially as hereiubefore described and
illustrated in the drawings annexed.
Dated this twenty-sixth day of February 1884