Improvements in Letting-off Motions for Looms.
Year: 1890

page_text: Date of Application, 24th Feb., 1890
Complete Specification Left. 24th Nov.. 1890-Accepted. 27th Dec.. 1890
PROVISIONAL SPECIFICATION.
Improvements in Letting-off Motions for Looms.
1, ISAAC KIRKBRIDE, of 4, River Street, Colne, in the County of Lancaster,
Joiner, do hereby declare the nature of this invention to be as follows:-
This invention relates to an arrangement of springs as a substitute for the
weights now used to impart drag or friction to the warp beam.
The chains or ropes
are wound in the usual manner round the collars or necks of the warp roller, but
instead of attaching such chains or ropes to the weight levers, they are each attached
to a spring, one at each end of the loom, connected to a cross bar extending from
spring to spring.
A screw bolt acting in a chased bracket at the centre of the bar is employed to
impart more or less tension on the springs as may be required; and to ascertain the
exact amount of pressure or tension imparted to the springs, I employ a pointer
moving over a fixed dial, or index plate, as will indicate the amount of pressure or
tension placed upon the springs.
Dated this 22nd day of February 1890.
THOS. RICHMOND,
Agent.
COMPLETE SPECIFICATION.
Improvements in Letting-off Motions for Looms.
1, ISAAC KIRKBRIDE, of 4, River Street, Colue, in the County of Lancaster,
Joiner, 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:-
This invention relates to an arrangement of springs as a substitute for weights now
used to impart drag or friction to the warp-beam. The chains or ropes are wound in
the usual manner round the collars or necks of the warp roller, but instead of
attaching such chains or ropes to the weighted levers, they are each attached to
springs, one at each end of the loon, connected to a cross-bar extending from spring
to spring. A screw bolt, acting in a chased bracket at the centre of the bar, is
employed to impart more or less tension on the springs as may be required; and to
ascertain the exact amount of pressure or tension imparted to the springs, 1 employ a
pointer moving over a fixed dial or index-plate, as will indicate the amount of
pressure or tension placed upon the springs.
In the accompanying drawings,
Fig. 1 represents a tensional appliance, as applied to the back part of a power
loom for applying friction or drag to warp beam, and constructed in accordance
with my invention.
Fig. 2 represents a partial end view of the loom, in which view is shewn parts of
mechanism for retaining in position the weighting lever hereinafter described.
Fig. 3 is a similar view or elevation of the loom to that shewn in Fig. 1, in which
view is represented a modification of my invention. Fig. 4 represents an indicator
for ascertaining the amount of pressure imparted to the warp beam.
A is the loom frame; B, the back rail; C, the warp beam, around the necks or
collars of which are wound one or more coils of the chains or ropes D. The inner
ends of the said chains or ropes are fixed in the usual manner to a bracket or the like
inside the loom, whilst the outer ends are attached to spiral springs E, which are
connected to horizontal bar or beam F, centered on stud G, fixed to the back rail of
the loom.

page_text: Pressure is applied to the horizontal beam F through the medium of hand lever H
centered on stud I, and connected by links J to the horizontal beam. The hand
lever H, when depressed to apply the requisite pressure is then retained in position
by being pushed against the serrated surface of the vertical plate K, attached to the
framing of the loom.
J.
Fig. 3 represents a modification of my invention. In this view, the spiral
springs E are dispensed with, and the blade springs e substituted, and fixed to the
horizontal bracket or beam F. one on each side, so that by screwing down the screw
spindle L into a chased hole in the bracket M, more or less pressure will be placed
upon the horizontal beam F; exerting through the medium of blade springs e and
chains D the requisite friction or drag to the warp beam C.
If desired, the adjustment of the tensional appliance may be rendered automatic
by placing on the screw spindle L a ratchet or toothed wheel n, provided with a
catch-lever O, connected by link P to vertical spring lever Q, in such a manner as to
be actuated to the extent of one tooth at each revolution of the warp-beam C by the
projection R fixed to the said beam.
1
To relieve the warp beam from all friction or drag when taking up and letting
back the warp, after "pulling back," or for other purposes, and without interfering
with the previous adjustment of the tensional appliance, the chased bracket M is
mounted upon the eccentric S, which is capable of turning on stud T, fixed to the
back rail. By simply turning the handle R' until the full side of the eccentric is
brought to the top side of the stud T, the warp-beam. is. instantly relieved from all
drag or friction. When the hand-lever is again depressed so as to bring the full part
of the eccentric S on the under-side of the stud T, the friction or drag is again
applied to the warp-beam to the same degree as before the elevation of the hand-
lever.
To ascertain the exact amount of pressure or tension imparted to the springs and
warp beam, I employ pointer U, moving over a fixed dial or index-plate V, and
connected with the horizontal beam F, seen in Figs. 3 and 4.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination of parts for applying friction or drag to warp beams, sub-
stantially as described and illustrated in Figs. 1 and 2.
2. The employment of an indicator for giving the amount of tension applied to
warp beams, substantially as described.
Dated this 22nd day of November 1890.
THOS. RICHMOND,
Agent.