Year: 1886

page_text: :
We, EUGENE VIRET, ALFRED CHARLEMAGNE PRUVOT both of Reims (Marne) in
the Republic of. France, Engineers, and EUGENE MATHIEU and RENÉ MATHIEU also
both of Reims (Marne) in the Republic of France, Manufacturing Engineers, 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 :-
Our invention relates to improvements in stop motions for looms, whereby the
looni is automatically stopped on the breakage of a weft thread, or on a thread
coming to an end, no matter what number of shuttles are employed, that may
remain in the shuttle boxes on one and the same side of the loom, which result
has not heretofore been attained in such cases with the apparatus at present
employed.
We will proceed to describe the construction and mode of action of the said
apparatus referring to the accompanying drawing in which Fig. 1 shews a sectional
elevation, Fig. 2 a side view, and Figs. 3 and 4 part plans."
The bar A carrying at its upper end one or more needles a, moves up and down
in the grid B of the stop-motion, being guided in its motion by means of a slotted
arm C fixed to the framing D. The bar A and needle a have for their object to
depress at certain times the weft threads on the lathe beam during the motion of
the stopping device E, in such manner that whatever be the number of weft
threads carried by several shuttles that remain in the shuttle boxes on one side,
the stopping device only comes in contact with a single weft thread on the return
of the lathe, namely that which the last shuttle has left in the shed.
In certain looms, in particular those with rising and falling shuttle boxes, the
needle apparatus must be arranged to operate in the reverse manner that is to say,
so as to elevate the weft threads for the operation of the stopping device; this is
effected by the modified arrangement at Fig. 5. In this case the needle bar A
instead of carrying the needles directly, actuates a lever G pivotted to a bracket H
on the framing D, and carrying one or more needles b, the oscillations of which on
the axis c are limited by a stop d, so that when the needle bar A descends, the
needles b will lift the weft threads, and allow the stopping device to pass, as
indicated by the full lines, the dotted lines shewing the opposite position.

page_text: '
The mode of operating of the above described apparatus is as follows. The lower
end of the needle bar A Fig. 1, is attached to a cam piece I that oscillates on an
axis fixed to the framing J. This cam piece I has a notch into which takes a
bolt K Figs. 2 and 4; when this is raised the cam can be actuated by means of two
rods L and M and a tappet N situated on the cam shaft of the loom, and by the
spring O fixed at one end to the shaft a and at the other end to the rod M which
carries a roller that is kept in contact with the tappet N. When the bolt K gears
with the cam I, the needle bar A remains stationary. The grid B of the stopping
device in which work the needles a or b Figs. 1 2 and 5, carries a small stop P
with counterweight pivotted to the side of the grid, and which has for its object to
prevent the stopping device from stopping the loom when the shuttle passes from
the shed, the stop being made to take the place of the weft thread. This stop is
actuated by the needles a or b which depress it when they depress the weft thread
for permitting the passage of the stopping device, as shewn at Figs. 1 and 2, or
conversely as at Fig. 5. For preventing the stopping device E Figs. 1 and 3 from
catching in the weft thread, it is formed of two articulated parts, the fork fand
the tail g. Thus the fork can rise without hooking the weft thread when the lathe
recedes, the limbs of the fork being either jointly or separately articulated.
For the same purpose it is advisable to provide on the lathe beam a special
guide Q, the shape of which will vary according to the nature of the loom.
The stopping device E operates in the usual manner for stopping the motion of
the loom when the tail a fails to be raised by contact off with the weft thread.
The arrangement for causing the bolt K to lock with the cam I of the needlo
bar A is as follows:-The bolt K acted upon by a spring R is carried by a double
ended lever V that oscillates upon an axis & fixed to the loom frame. For
imparting motion to K the rear part of the lever V carries a.bent arm S that can
turn round upon its vertical part, its horizontal part is connected by a rod T to a
point of the change-card rod that regulates the cams of the picker levers or to the
lever of the shuttle driver or to an arm actuated by the shuttle box motion.
By this connection the horizontal part of the arm is brought under the rollers of
the ordinary stopping gear which are not shewn on the drawing, and which in
pressing upon the arm depress the end of the lever V to which this is attached and
thus raise the bolt K out of gear with the cam I of the needle bar, the latter being
then free to follow the impulse of the rods M and L when these are acted upon by
the tappet N and spring O as above described.
As the locking of the needle bar by the bolt K is regulated by the change-cards
that regulate the shuttle box motion and the action of the picker levers it will be
seen that such locking will vary according to the design of the fabric to be
produced, that is to say, according to the design of the change cards employed.
In all looms with several shuttles, in particular in those with rising and falling
or revolving shuttle boxes and having an uneven number of weft threads, it is
requisite to employ two of the above described apparatus, but in those looms of
the above class in which there is an even number of weft threads it suffices to
have one of the improved apparatus, and an ordinary stop motion on the other side.
By the above described stop motion mechanism the following advantages among
many are obtained: All faults in design and misses or faults in weft threads are
avoided, and consequently also the disadvantages and loss of time attendant on
having to introduce a fresh weft thread; a considerable increase in the producing
power of the loom and a decrease in the cost of pattern weaving will also result,
and operatives at a lower scale of wages can be employed.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declare that what
we claim is: 6
1. The construction and mode of operation of the herein described moveable
needle mechanism, whereby the several weft threads are depressed or raised for
allowing the stopping device to come in contact only with the thread last thrown.

page_text: 2. The mode herein described of actuating the needle mechanism referred to in
the preceding claim and of locking it when required by means of a bolt actuated
either by the change card rod that regulates the cams of the picker levers or by
the picker arm, or by the movement of the shuttle boxes.
3. The use of the moveable stop P on the stop motion grid, actuated by the
needle mechanism as and for the purposes described.
4. The construction of the stopping device E of two separate parts and of the
guide Q on the lathe beam, substantially as herein described.
ABEL & IMRAY,
Agents for the Applicants.