An Improved Weft Stop-motion for Power Looms.
Year: 1899

page_text: Date of Application, 21st June, 1899
Complete Specification Left, 21st Mar., 1900-Accepted, 21st Apr.. 1900
PROVISIONAL SPECIFICATION.
An Improved Weft Stop-motion for Power Looms.
I, WILLIAM GIBB SIMPSON, of 108, Magdala Terrace, Galashiels, Power Loom
Tenter, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved weft stop-motion for power looms and
it has for its object the provision of a stop-motion which whilst being simple in
construction will, at the same time, be certion and efficient in its action.
I attach the stop-motion by means of screws or otherwise in the usual manner
to the frame of the loom.
The stop-motion consists of a metal plate of suitable size and having two pro-
jecting brackets or lugs formed thereon. A bar of suitable length slides horizon-
tally in openings made in the lugs and is shaped at one end in such a manner as
to be readily connected to the breast beam of the loom and actuated by any
suitable working part of the loom.
The usual fork is fixed in any suitable manner to a metal block pivotally fitted
into the brackets or lugs by means of pointed adjusting screws and jam nuts.
This block has two projecting nose-pieces which enter into suitably curved slots
made in the horizontal sliding bar one above the other, the top one being a
partially open slot. As the bar slides backwards and forwards the lower curved
slot acts on the lower nose piece in such manner as to cause the metal block to
partially rotate on its pivot pins and in this way raise and lower the fork for the
passage of the shuttle."
The upper slot in the horizontal sliding bar is made with a notched or cut
out part which is so arranged that should the weft break the fork and metal
block fall downwards and the upper nose piece formed on the block enters the
notched part of the slot and the motion is thereby stopped.
This stop-motion is specially adapted for looms working at a high rate of speed
as its action is absolutely certain should the weft break at any time.
Dated this 20th day of June 1899
H. D. FITZPATRICK,
100, Wellington Street, Glasgow, Agent.
An Improved Weft Stop-motion for Power Looms.
I, WILLIAM GIBB SIMPSON, of 108, Magdala Terrace, Galashiels, Power Loom
Tenter, 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 improved weft stop-motion for power looms and
it has for its object the provision of a stop-motion which whilst being simple in
construction will, at the same time, be certain and efficient in its action.
This invention is an improvement upon the well known Paterson and Brook's
motion, Patent No. 14941 of 1886.

page_text: In order that my said invention may be properly understood I have hereunto
appended an explanatory sheet of drawings, whereon,
Fig. 1 is a front view of the motion and showing the weft fork lowered so
as to stop the action.
Fig. 2 is a similar view but showing the weft fork raised.
Fig. 3 is a view of the slide e.
Fig. 4 is a cross section taken on the line X-X Fig. 1.
Fig. 5 is a cross section taken on the line, Y-Y Fig. 2.
Fig. 6 is a plan and side view of the pivotted block
The weft stop-motion is attached by means of screws a, or otherwise, in the
usual manner to the lay" or "slay" bof the loom.
The stop motion consists of a metal plate c of suitable size having two projecting
brackets or lugs d formed thereon. A reciprocating slide e which is of, suitable
length and works horizontally in openings made in the lugs is connected by
the lugs f, f, and pivot pin g and connecting rod-h, in the usual manner, with the
breast beam of the loom. Connected to the lower end of the pivot pin g, at one
end, and to a hook screwed into the "lay" or "slay" at the other end, is a
spiral spring which retracts the slide e after each movement towards the left
hand.
The usual weft fork k is fixed by means of the screw to the metal block m
which latter is pivotally held in place by means of the pointed adjusting screws n,
passed through the lugs d, and the jam nuts o. The points of the screws enter cups
at the ends of the spindle extensions m² m² of the block m. This block has two
skewed and tapered projecting nose pieces p, q, the lower one of which, g, enters
a specially curved closed slot r of a slightly undulating or cam formation made
at the centre of the slide e, whilst, the upper one, p. enters an open curved slot s
cut at the upper side of the slide just above the closed slot. The slots has a
recess at the back and a second smaller and slightly lower recess or notch s¹
formed by the curved tooth 3. As the slide e moves backwards and forwards the
lower slot acts on the lower nose piece y and, owing to the inclination of the
slot, causes the metal block m to partially rotate on its pivot or centre screws n,n.
and, in this manner, raise the fork for the passage of the shuttle at each throw
and lower it again thereafter. So long as the weft remains intact the weft fork k,
rests on the weft with the result that the nose pièce 2 of the block m cannot
fall low enough to catch against the tooth 3 but overrides the latter and catches
in the recess 2 but, whenever the weft breaks, the fork falls down to such an
extent (being unsupported by the weft) as to cause the nose piece p to fail to
override the tooth and to catch in the recess with the result the motion is
immediately stopped. In Figs. 1 and 4 the nose piece p is shown as caught in
the recess s¹.
This stop motion is specially adapted for looms working at a high rate of speed
as its action is absolutely certain should the weft break at any time.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I consider novel and desire to claim is:-
1. A weft stop motion characterized by a slide e having a closed slot r and an
open slots made substantially as herein before described with reference to the
drawings annexed.
2. In a weft stop motion the combination of a slide having slots r, s, and a
block m made with two nose pieces 7, 9, adapted to work in the slots, substan-
tially as herein before described with reference to the drawings annexed.
Dated this 19th day of March 1900.
H. D. FITZPATRICK,
100, Wellington Street, Glasgow, Agent.