Improvements in Stop Mechanism for Looms.
Year: 1891

page_text: Improvements in Stop Mechanism for Looms.
We, AUGUSTE DONT, and HENRI PARENT, both of Roubaix, in the French
Republic, Manufacturers, 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:-
In this invention we have been guided by the idea that it is desirable for the
woof to be relieved from the weight of the device and this we accomplish by means
of a special contrivance as will readily appear from the following description and
the accompanying drawings in which
Figs. 1, 2, 3 and 4 show the beam e of a weaver's loom in the various positions
It is this beam or
it is adapted to assume in relation to the permanent pivot c.
lever that carries the stop-mechanism which mainly consists of;-
(1). A vertical guide-way secured to the centre of the beam e and in which
guide is arranged to work a slide provided with a hook a and a tappet or stop b.
(2). The stop mechanism formed by another hook a check k and a fork or
yoke f
Under normal circumstances this device moves within the space limited by the
positions shown in Figs. 2 and 4 so that the tappet of the slide which
latter constantly bears upon the end of the lever arm l,-always passes the tappet t
without touching it; when however the thread breaks, the fork or yoke descends
to the position shown in Fig. 3, its hook engages with and arrests the hook a
and the tappet which in this position encounters the tappet throws the loom out
of gear.
b
Special attention is called to the fact that by this arrangement the yoke is held
up, owing to the contact of the parts and at o-until the woof receives suf-
ficient support from the warp as the latter rises again. Not till then is the said
yoke allowed to rest upon the woof which at that moment it may do without any
strain. This is one of the most important features of the invention.
In order to render our improvements applicable to looms with revolving shuttle
cases (known as "revolvers "), the device above described is supplemented by the
addition to the lever operating the revolving case of a jointed check or link y
provided with a spring bolt m guides n and n', a socket s, a suitable spring q
and all accessory parts forming our improved stop mechanism as shown in Figs. 5, 6
and 7.
In normal operation the lever we acted upon by the eccentric cam d turns about
its permanent fulcrum or pivot a and in so doing imparts rotary motion to the
shuttle case assuming the positions illustrated in Figs. 6 and 7.
But in Figs. 3 and 5 the woof thread is supposed to be broken. The tappet b
(Fig. 3) therefore meets the tappet t and while the loom is thereby thrown out of
gear this (by means of any well known device which may vary according to the
particular shape of the loom) also causes the bolt m to issue from the socket 8.
The cam d by this time raises the lever w; but inasmuch as the end of the said
lever is heavily loaded by the parts it operates in order to turn the case it follows
that the pressure of the cam is sustained by the cheek y which is depressed, instead
of the lever end being raised. Thus the case is prevented from turning until the
loom is set in operation again and allow the bolt m to resume its position within
the sockets whereby the joint of the cheeky is rendered rigid and incapable of
vielding to pressure.

page_text: 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
b
1. In a weaving loom the combination with a hook such as r and check such
as k; of a hook such as tappet & arranged to engage with the tappet ta slide such
as g and the lever arm such as substantially as described and illustrated in the
accompanying drawings.
2. The application to lever operating looms with revolving shuttle cases of a
second jointed cheek or link y spring-bolt m with its socket s guides n and n¹
and suitable spring g substantially as described and illustrated in the accompanying
drawings.
3. The combination and arrangement of parts constituting the stop mechanism
shown in Figures 1 to 4 of the accompanying drawings.
4. The combination and arrangement of parts constituting the stop mechanism
shown in Figures 5, 6 and 7 of the accompanying drawings.
Dated this Eighth day of April 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicants.