Improvements in Mechanism for Actuating the Healds of Looms for Weaving.
Year: 1894

page_text: Date of Application, 3rd Sent., 1894-Accepted, 13th Oct., 1894
COMPLETE
SPECIFICATION.
Improvements in Mechanism for Actuating the Healds of Looms for
Weaving.
I, LEVI FISH, of Spa Mill, Preston, in the County of Lancaster, Cotton
Manufacturer, 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 :-
My invention has for its object to provide a reliable apparatus for actuating the
healds of looms for weaving. It is applicable to that class of weaving in which
heretofore overhead dobby apparatus has been employed for actuating the said
healds. Dobby apparatus is liable to cause the healds to "miss" owing to the
lattice pegs becoming loose or worn or to other parts of the mechanism becoming
deranged and hence the healds fail to be lifted at the right time and bad work
results. According to this invention I actuate the healds by means of underneath
tappet and treadle mechanism in combination with a novel arrangement of apparatus
hereinafter described and illustrated in the accompanying drawings.
In the said drawings
Fig. 1 is a sectional end view
Fig. 2 a sectional front view and
Fig. 3 a sectional plan view shewing the nature of my improvements as applied
to a loom of any ordinary construction.
Figs. 4 and 5 are enlarged detail views
Figs. 6, 7, and 8 are respectively sectional end front and plan views of a modified
arrangement of the apparatus shewn at Figs. 1, 2, and 3.
At Figs. 1, 2, and 3 a a are the healds b b the tappets c the tappet shaft and
dd the treadles. I suspend the upper stave of each heald from the two ends of a
cord e which passes over grooved side pulleys ff and then over and down between
a pair of centrally situated grooved pulleys g g so as to form a loop at which
engages with a hook on the upper extremity of a wire rod i whose lower end
engages with one of the treadles d. In the arrangement shewn in the drawings
six treadles and six healds are employed but the description applying to one is
applicable to the other five as will be well understood. Attached to the lower
heald stave and passing downwardly therefrom is another cord k which passes
under side pulleys ff and then under and up between a pair of centrally situated
pulleys g¹g so as to form a loop similar to the loop described with reference to
the upper heald stave-the upper end of the said loop being connected to the
lower side of the treadle d. It will be observed that I arrange the treadles above
the tappets bb instead of underneath them as is usual being helical springs for
m is a
holding down the treadles d d upon the running surface of the tappets b b.
frame or
grate" forming guide bearings for the arms of the several treadles d d.
n is a frame containing the several pairs of central grooved pulleys g g the lower
frame n¹ being of similar construction to the upper frame n (shewn enlarged at
Figs. 4 and 5). At Fig. 5 the upper half of the frame n is not shewn in order that
the arrangement of the pulleys may be more clearly seen. By the arrangement of
mechanism or apparatus hereinabove described the tension upon the heald is
uniform throughout its upward or downward movement as the case may be that is
to say when the treadle pulls the heald downwardly it lets off the cord e above the
heald to the same extent that it takes up the cord k below the heald.
At Figs. 5, 7, and 8 the upper heald staves are suspended from cor.ls e e¹ attached
at their upper ends to the respective extremities of two-preferably leather-belts or
straps p p passing over the pulleys ffjoined together at g the lower strap p' being

page_text: fast to the curved face of the quadrant arm r. The quadrant has projecting
from its boss or hub an arms which is connected by means of a rod t with one end
of a rocking lever u whose other end is connected by the link v to the arm of the
treadle d. The lower heald stave is pulled at downwardly by elastic cords w w―
of the ordinary kind-fastened at their lower ends to the stationary framework
of the loom. m is a similar frame or grate to that shown in Figs. 1, 2, and 3 and y
is another frame or grate for guiding the rocking levers u u.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The improved mechanism for actuating the healds of looms for weaving
consisting of the combination of parts arranged and operating substantially as
herein described with reference to and shewn at Figs. 1, 2, and 3 of the drawings.
2. The improved mechanism for actuating the healds of looms for weaving
consisting of the combination of parts arranged and operating substantially as
herein described with reference to and shewn at Figs. 6, 7, and 8 of the drawings.
Dated this 3rd day of September 1894.