IMPROVEMENTS IN THE LET-OFF MOTION OF LOOMS FOR WEAVING WIRE CLOTH
Year: 1884

page_text: I CHARLES HENRY JOHNSON, of Smedley Road Manchester in the County of
Lancaster Wire Manufacturer do hereby declare the nature of my invention for
IMPROVEMENTS IN THE LET-OFF MOTION OF LOOMS FOR WEAVING WIRE CLOTH
to be as follows :-
This invention relates to the construction of the hand looms employed for'
weaving wire cloth, especially that kind of wire cloth employed in paper making
machines; the object of the invention being to equalize the strain or tension upon
the wire warp, and thus to produce a more evenly woven cloth and to increase
the durability of such cloth and to render it less liable to break in a transverso
direction.
The invention consists principally in the construction and application to the
loom of a positive "letting off" motion for the warp beam which is actuated by
the movement of the "slay" in such a manner that the wire warp is held tightly
when the weft is being beaten up, and is let off automatically during the backward
movement of the slay.
To the upper part of the slay I connect an arm the other end of which is
attached to a slotted lever; and the lower end of this lever is provided with a
catch which works in the teeth of a ratchet wheel. This wheel is keyed upon'
a shaft upon the other end of which is fixed a worm gearing with a worm wheel
on the warp beam.
Each time that the slay returns after beating up the weft wire the catch takes
up one or more teeth of the ratchet wheel and thus causes the warp beam to let off
the requisite amount of warp. The amount let off is regulated by raising or
lowering the end of the arm in the slot of the lever so as to give the latter less or.
more traverse.
GEORGE DAVIES,
Agent for the Applicant,
4, St. Ann's Square, Manchester.

page_text: "
I CHARLES HENRY. JOHNSON. of. Smedley Road Manchester in the County of
Lancaster Wire Manufacturer do hereby declare the nature of my invention for
"IMPROVEMENTS IN THE " LET-OFF MOTION OF LOOMS FOR WEAVING WIRE
CLOTH" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :—
This invention relates to the construction of the hand looms employed for
weaving wire cloth, especially that kind of wire cloth employed in paper making
machines; the object of the invention being to equalize the strain or tension
upon the wire warp and thus to produce a more evenly woven cloth, to increase
the durability of such cloth, and to render it less liable to break in a transvere
direction.
The invention consists principally in the construction and application to the
loom of a positive "letting-off" motion for the warp beam which is actuated by
the movement of the "slay" in such a manner that the wire warp is held tightly
whilst the weft is being beaten up, and is let off automatically during the backward
movement-of-the-slay.
Such being the nature and object of my said invention I will now proceed to
describe more particularly the manner in which the same is to be carried into
practical effect, and in order. that the same may be clearly understood I have
annexed hereunto a sheet of drawings illustrative thereof, and have marked the
same with figures and letters of reference corresponding with those in the following
explanation thereof.
Fig. 1: in the drawing is a side view of a hand loon for weaving wire cloth with
my invention shown as applied thereto. Fig 2. is a back view of a portion of the
same and Fig. 3. is a plan view (enlarged) of the crown wheel and ratchet lever
hereinafter described.
a, a is the framing of the loom-b, b the lathe or slay-c, c the warp beam and
d, d is the worm and d*, d* the worm wheel for actuating the same.
To the upper part of the slay b, b. I connect an arm e, e the other end of which is
attached to a slotted lever f, f and the lower end of this lever is connected to one
arm of a ratcliet lever g, g (see Fig. 3) the other arm of which carries a pawl or
catch h, h which works in the teeth of a crown ratchet wheel i, i. This wheel i, i
is keyed upon the vertical shaft k, k which also carries the worm d, d gearing with
the worm wheel d*, dx on the warp beam c, c.
Each time that the slay b; b returns after beating up the weft wire, the
catch h, takes up one or more teeth of the crown ratchet wheel i, i, and thus
causes the warp beam c, c to let off automatically the requisite amount of warp,
and the beam is held firmly during the beating up of the weft wire by the slay, by
means of the worm and wheel d and d*. In looms where the worm d is double
threaded or acute angled, a holding pawl or catch taking also into the teeth of the
wheel i, i may be carried by a bracket attached to the frame or other fixed part of
the loom.
The amount of wire, warp let off at cach return motion of the slay b, bis
regulated by raising or lowering the end of the armse, e in the slot of the lever f, f
so as to give the latter less or more traverse.
. It is evident that if preferred the same mechanisin may be employed to let off
the wire warp during the beat up instead of during the return stroke of the lathe
but I prefer the former.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed I declare that what
I claim, is the construction and application of hand looms for weaving wire cloth of
a positive "letting-off" motion actuated directly from the lathe or slay of the loom,
and so connected thereto that the warp beam is held firmly during the beating-up
of the weft wire and the requisite amount of warp wire is let off during, and by
means, of the backward motion of the said lathe or slay or vice versâ substantially
as bereinbefore particularly described and illustrated by the drawings annexed.
Dated thio Plot day of December 1001
GEORGE DAVIES,
Agent for the Applicant,"
4, St. Ann's Square, Manchester.