Improvements in Warp Stop Motions for Looms.
Year: 1895

page_text: Date of Application, 16th Apr., 1895-Accepted, 18th May, 1895
Improvements in Warp Stop Motions for Looms.
A communication from abroad by WILLIAM FRANKLIN DRAPER, of Hopedale,
County of Worcester, in the State of Massachusetts, one of the United States
of America, Manufacturer.
1, ALFRED GEORGE BROOKES of 55 & 56 Chancery Lane, in the County of
London, Chartered Patent Agent, 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 warp stop motions for looms of the class wherein a
series of detectors mounted in a suitable support are acted upon and moved by the
unbroken warp threads, preferably by the shedding of the said threads.
In the form in which this invention is herein embodied my correspondent has
selected a detector shown as composed of a piece of thin metal similar to the dent
of a reed, and has provided these detectors with openings of sufficient length to
receive two, or it may be more, warp threads and permit the said threads, when
unbroken, to be formed into sheds, the threads at such time crossing each other,
one or more of the warp threads so moved acting to move the detectors, so that the
stop-motion will not act, but in case a warp thread, to be moved in a reed space to
thus come into one of the planes of the shed, should break or slacken, then the
particular detector co-operating therewith will not be moved, and through suitable
intermediate devices it will actuate suitable stopping mechanism to effect the
stopping of the loom.
The stopping mechanism may be of any suitable or usual construction.
The detectors may be applied in the loom at any desired point between the fell
of the cloth and the lease rods used in the warp, or at any desired point where
the threads in the formation of the sheds cross each other.
Fig. 1 is a sectional detail of a loom embodying one form of the improved warp
stop mechanism.
Fig. 2 is a section to the right of the dotted line a, Fig. 1.
Fig. 3, on a large scale, represents one of the detectors detached.
Fig. 4, is a detail in plan, showing one corner of the loom, with the notched
holding plate for the shipper handle; and
Fig. 5 is a detail showing part of the lay with a detector dropped.
Referring to the drawing, let A represent the breast beam of any usual loom,
and A' part of the side frame thereof.
The foom frame has extended from it a holding plate B having a notch B', in
which may be caught and held the usual shipper B³.
Underneath the breast beam in suitable bearings a is a rock-shaft a' having an
arm a³, shown by dotted lines, which bears against the shipper handle B' at that
side thereof nearest the notch B', said rock-shaft having a second arm a³, which
may normally stand in vertical position, as represented in the drawing.
The lay C, the reed C', and the lay cap C, are and may be of any usual or
suitable construction.
Herein I have shown as applied to the lay cap a stand d, and to the lay a bar or
comb d', each having suitable slots or openings in which are placed a series of
detectors

page_text: These detectors in the form in which my correspondent has embodied the
invention in this application are composed of thin strips or pieces of metal having
long notches or openings el, herein shown as in one side of said detectors and having
suitable projections at their upper ends to prevent the said detectors from
entirely falling away from the lay.
Extended inwardly from the loom side is a stud f..
The lay sword has suitable bearings for a rock-shaft 9 which is extended across
the loom from side to side.
This rock-shaft has at suitable points arms g', on the upper ends of which is
Secured a feeler which in practice will preferably be made as a thin flat steel bar
also extended across the lay and substantially as long as the reed.
The rock-shaft g has also connected to it a dagger h.
The loom to which this invention will be applied will have usual harness
mechanism for forming sheds in the warp, and usual take-up and let-off.
In practice, the warps contained on a warp beam or equivalent spool or device
will be led forward through the eyes of suitable heddles or harnesses, and between
the usual warp beam and harnesses, the said warp threads will be separated by
lease rods, not shown, in usual manner.
From the harnesses the warp threads, as herein shown, will be led through long
notches or openings el in the detectors and thence through between the dent spaces
of the usual reed, if employed, and to and over the breast beam, the fell of the
cloth being the point where the usual weft is beat in by the dents of the reed.
The length of the openings e¹ in the detectors is such that the warp threads
therein may cross each other and be fully opened or shed in the said openings, and
it will be understood that each notch may contain two or more warp threads
according to the particular class of work being done or the number of warp threads
contained in each dent space of the reed in case the latter is used, each warp
thread in each dent being controlled by its own harness frame.
In the formation of the sheds by the harnesses, in the present instance of the
invention the warp threads as they rise into the upper plane of the shed, act upon
the detectors at the upper ends of the openings and lift the same so that the
lower ends of the said detectors are always above the path of movement of the
feeler bar g, but in case a warp thread about to be lifted into the upper plane of
the shed, should be broken or slacked, of course the detector in the opening of which
the said warp thread lies, would not be lifted and the lower end of the said detector
will drop and come within the range of movement of the said feeler.
In case a detector drops, it acts to prevent the movement of the feeler toward
the front of the lay, as it otherwise would be moved when the dagger passes
beyond the pin during the forward or beating stroke of the lay, and the detector,
dropped as described, thus serves to hold up the forward end of the dagger, so
that it strikes the forward end of a slide bar m mounted in guides m' on the loom
frame and normally pressed toward the lay, it may be by the arm a³.
When the slide bar is struck by the dagger, the said bar acts on the arm a³,
turns the rock-shaft a¹, and causes the arm a² to knock the shipper handle out
from its usual holding notch.
.
The release of the shipper handle from its notch will effect the stopping of the
loom through usual shipper mechanism controlling the application of power to the
loom.
I have not herein shown any mechanism controlled by the shipper handle to
effect the automatic stopping of the loom or the transfer of the driving belt from a
fast to a loose pulley, for the reason that such mechanism per se is not of my
correspondents invention and there may be incorporated with a loom containing the
improvements, any well known form of such mechanism.
Co-operating with the arms of the feeler are two stops 10, 12, which prevent the
bar g from being turned too far back or to drop too far forward.
This invention is not limited to the particular construction herein represented
for the detectors.

page_text: Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1. The use in a warp stop motion for looms, of a detector support; a series of
warp detectors mounted therein and adapted to be moved by the unbroken warp
threads when the latter are opened in shedding; openings in said detectors through
which two or more warp threads may be passed, said openings being of sufficient
length to permit the threads therein to be separated one from another in shedding;
and a stopping mechanism for the loom controlled by said detectors, substantially
as described.
2. The use in a warp stop motion for looms, of a lay; a detector support; a
series of movable detectors mounted thereon and adapted to be acted upon and
moved by the unbroken warp threads, said detectors moving in lateral contact with
and guided by each other, each of said detectors having an opening in one side to
receive a warp thread or threads, the adjacent detector constituting one side wall
of said opening, and a stopping mechanism for the loom controlled by said detectors,
substantially as described.
3. The use, in a warp stop motion for looms, of a lay, a reed thereon ; a detector
support independent and back of said reed and on said lay; and a series of sliding
warp detectors mounted in said support and adapted to be acted upon and moved
by the unbroken warp threads, said detectors contacting laterally with each other
and in their sliding movement being guided one by another; and a stopping
mechanism for the loom controlled by said detectors, substantially as described.
Dated the 16th day of April 1895.
WM. BROOKES & SON,
55 & 56, Chaucery Lane, London, Agents for the Applicant.