IMPROVEMENTS IN LOOMS FOR WEAVING
Year: 1868

page_text: PROVISIONAL SPECIFICATION left by David Crichton, William
Donbavand, and Duncan Crighton, at the Office of the Com-
missioners of Patents, with their Petition, on the 6th April 1868.
We, DAVID CRICHTON, of the City of Manchester, in the County
of Lancaster, Machinist, WILLIAM DONBAVAND, of the same Place,
Scale Beam and Weighing Machine Manufacturer, and DUNCAN
CRIGHTON, of the same Place, Engineer, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN LOOMS FOR WEAVING," to
be as follows:-
Our Invention consists in improved arrangements for easing the
swells and regulating the shuttle in the shuttle boxes of looms in
the process of weaving for the purpose of enabling the shuttle to be
more easily and steadily ejected from the shuttle boxes by the action
of the pickers than has hitherto been accomplished and thereby diminish
the wear in the parts which operate the shuttle action and reduce
the motive power to work the loom. We apply to the shuttle swells
in the. shuttle boxes a supplementary spring action or its equivalent.

page_text: for steadying the shuttle when in the boxes and also employ certain
mechanical movements put in operation during the backward or forward
stroke of the lathe, the mechanical movements being for the purpose
of taking off the pressure of the stop rod fingers from the swells
before and at the time the shuttle leaves the box and the supple-
mentary spring action for keeping the shuttle steady in the box
to receive the picker stroke and regulating its race across the board
and at the same time allow the required pressure to be given to the
swell when the shuttle arrives in the opposite box.
These improvements will be understood by the following description
thereof, reference being had to the figures and letters drawn and
marked on the accompanying Sheet of Drawings; Fig. 1 being an end
view from the inside of part of a loom provided with an arrangement
of our improvements; and Figs. 2 and 3, plans of part of the same..
a, Figs. 1, 2 and 3, represents the race board of the lathe in section
and in part; b, the shuttle, and c, one of the sword arms; d, Fig. 1
the stop rod finger; e, the stop rod; and f, the frog; g, Figs. 2
and 3, the ordinary swell for working the stop rod; h, the swell
finger; and one of the pickers; and in Fig. 1, k, l, represent one
of the cranks and crank arms.. To the ordinary swell g, Figs. 21
and 3, we apply the supplementary spring m for exerting a slight
pressure on the said swell g, and to the stop rod e, Fig. 1, we fix
an arm n, the hook o being connected by the spring p to the hook q
fixed to the sword arm c, and to the crank arm we fix a small
arm 7: The shuttle b with its pick of weft is driven across the race
board of the lathe when the lathe is moving back and shortly before
the shuttle leaves the box by the action of the picker i, the small
ann" comes in contact with the arm as shewn in Fig. 1 so as to
turn back the stop rod e a short distance and remove the swell
finger from the swell g, as seen in Fig. 2, and at the time the shuttle
is driven from the box the only pressure upon it is that which is
exerted by the supplementary spring m on the swell and thus the
shuttle is enabled to have an easy and steady delivery from the box.
After the crank has turned the bottom centre the crank arm / is
raised and the arm r removed from the arm in thereby releasing the
stop rod and allowing the spring p to bring forward the swell finger h
. as shewn in Fig. 3 and give the required pressure to the swell when
the shuttle arrives at the opposite box.

page_text: We have shewn and described an arrangement of our Invention
for releasing the stop rod fingers from the swells, but there are other
known contrivances not of our own Invention for the same purpose
and with these we combine the employment of our supplementary
spring pressure action or its equivalent.