An Improved Treading Motion for Looms for Weaving.
Year: 1889

page_text: Date of Application, 16th July, 1889
Complete Specification Left, 16th Apr., 1890-Accepted. 17th May. 1890
PROVISIONAL SPECIFICATION.
An Improved Treading Motion for Looms for Weaving.
We, JOSIAH GREENWOOD, of 25 Pine Street, Bury, Lancashire, Mechanic, and
JOHN ASHWORTH, of 2 Parsonage Street, Bury aforesaid, Mule Overlooker, do hereby
declare the nature of this invention to be as follows:-
Our invention has reference to the treading apparatus for operating the healds in
looms for weaving. In plain looms the healds are attached by cords to horizontal
levers working upon one stud, such levers being actuated by eccentrics or tappets for
the purpose of opening and closing the shed, and hitherto there has been one tappet
to each of such levers. The present method has always been unsatisfactory, because
at certain parts of each revolution of the eccentric, the eccentric temporarily left
the horizontal levers, during which time the levers were left free and not under
control, consequently they jump and have considerable vibration, causing damage to
the healds and also to the warp.
According to our invention, instead of the horizontal levers all working upon
the same fulcrum, as hitherto, we arrange them in pairs, one of which is shorter
than the other, the shorter lever being pivoted to the longer one by a bolt or other
like means. The healds are attached to the levers as usual, and on the longer lever
we attach a pulley, preferably grooved, in gear with which is an eccentric or tappet '
employed for the purpose of operating the said longer hinged lever, therefore when
the said long lever is depressed by the eccentric, the shorter lover is elevated, and
when the eccentric returns, the shorter lever, which is weighted for the purpose,
descends, causing the longer one to rise, whereby the shed is opened and closed as
formerly, but as the grooved pulley is always in contact with the eccentric, the up
and down motion of the healds is positive and regular, whilst the jumping and sudden
vibrations hitherto complained of are now avoided. We also dispense with one
eccentric for every pair of levers, whilst the wear and tear of the healds and yarn is
greatly reduced. The grate usually employed for steadying and guiding the levers
may also be dispensed with.
Dated this 15th day of July 1880
TASKER & CROSSLEY,
Halifax, Agents.
COMPLETE SPECIFICATION.
An Improved Treading Motion for Looms for Weaving.
We, JOSIAH GREENWOOD, of 25 Pine Street, Bury, Lancashire, Mechanic, and
JOHN ASHWORTH, of 2 Parsonage Street, Bury aforesaid, Mule Overlooker, do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
Our invention has reference to the treading apparatus for operating the healds
in looms for weaving. In plain looms the healds are attached by cords to horizontal
levers working upon a stud, such levers being actuated by eccentrics or tappets
for the purpose of opening and closing the shed. The present method and form of
tappets or eccentrics has always been unsatisfactory, because at certain parts of each
revolution of the tappet, the said tappet temporarily left the horizontal levers, during
which time the said levers were left free and not under control, consequently they
jumped and vibrated considerably, causing damage to the healds and also to the
warp. To prevent this we make our tappets of such a size and shape that they never
leave the bowls of the levers, but at every part of each revolution each tappet is

page_text: in contact with the said bowls, consequently the up and down motion of the healds
is positive and regular, whilst the jumping and sudden vibrations hitherto complained
of are now avoided.
Such being the nature and object of our invention, we will now make reference
to the accompanying sheet of drawings illustrative thereof, wherein Fig. 1 is elevation
of our improvements and Fig. 2 plan view. A represents the healds connected
on the upper part to cords B, and on the underside to cords C attached to
levers D working upon the fulcrum E in the ordinary manner. F represents our
improved tappets, and the drawing shews them in the positions they occupy when
the shed is finally opened. The improvements in these tappets consist in making
them of such a shape that they never leave the bowls G and when the shed is fully
opened there is a temporary dwell or cessation of motion of the levers D, giving
time for the shuttle to cross the loom, and this arises in consequence of certain
parts of the tappets being concentric on their surfaces between parts a and b, and
as the said tappets are templets of each other, it follows that when they are once-
adjusted in unison one with the other, that the face of such tappets can never leave
the bowls G, but are always rigidly in contact with the said bowls, whereby the shed
is always firm and a clear course is left for the shuttle. By this arrangement the warp
beam requires less weighting than formerly, and a saving in the healds is effected.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
The formation of tappets so shaped and adjusted with regard to each other that
their surfaces at no time leave the treading bowls.
TASKER & CROSSLEY,
Halifax, Agents.