Improvements in and relating to the Pattern and Weft-stop Mechanism of Looms.
Year: 1892

page_text: Date of Application, 3rd Dec., 1892
Complete Specification Left, 2nd Sept., 1893-Accepted, 4th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in and relating to the Pattern and Weft-stop
Mechanism of Looms.
I, ALEXANDER GOVAN, of 346 Great Eastern Road, Glasgow, Lanarkshire,
Power Loom Tenter, do hereby declare the nature of my invention to be as
follows:-
This invention has reference to and comprises certain improvements in and
relating to the pattern check motions of looms for weaving, and specially
applicable to those with pattern pin barrels, for bringing the respective shuttles
into action or in line with the race. And which improvements have for their
object the instantaneous stopping of the pattern barrel mechanism through the weft
fork mechanism, when the weft thread breaks or runs out, and before stoppage of
the loom so as to prevent the necessity of the weaver turning back the pattern
barrel mechanism and setting it when putting in a new shuttle, as has been required
to be done heretofore by the pattern barrel running on until the loom has stopped;
and also in giving a more steady and positive action to the pattern lever and its
drawing and pushing rod mechanism which bring the proper shuttles into action.
The improvements consist according to one arrangement in fitting the cam which
actuates the ratchet lever of the pattern pin barrel loose on the wiper or second
motion cam shaft, in place of rigid as heretofore, and in fitting a sliding clutch
coupling on the shaft taking into a corresponding clutch on one side of its boss.
This coupling is preferably fitted with a sliding pin working in a corresponding
hole or slot in a fixed clutch ring secured by a screw pin to the shaft on the opposite
or back face of the sliding clutch, so that the clutch may be set to an exact
position to bring the loose cam into action at the proper part of the revolution of
the shaft to actuate the ratchet pawl lever of the pattern barrel. This sliding
clutch is connected through fixed fulcrum bellcrank or other levers and link rods
to a lever on the longitudinal spindle, which sets on the brake mechanism and stops
the take up motion and made stronger than usual for this new purpose of shifting
the clutch mechanism. This lever of the clutch mechanism is operated by the
lever carrying the weft fork and the weft fork actuating cam lever, so that when
this cam lever comes into action it instantly takes the sliding clutch out of action
with its cam and stops the taking up of the pattern barrel, and is only put into
action again by the hand of the person after putting in the new weft and shuttle
and setting the weft fork mechanism again to take out the brake lever and stop
mechanism and which also keeps the clutch in action. The cam is also made of an
improved shape as also the actuated end of the ratchet lever of the pattern barrel
to raise it and make it act to turn the pattern barrel during a shorter part of the
revolution of the wiper shaft. The tappet which actuates the lever of the weft
fork mechanism is made to actuate this lever also through a short period of its
revolution by mounting an antifriction pulley on the tappet lever and making a
curved or angled step on the actuated end of the lever, which in this case is held
down by a helical or other light spring to bring the lever down to rest in its normal
lowest position on the tappet shaft, and so that the said antifriction pulley raises
this lever an inch or so suddenly, the horizontal arm of the lever being made
shorter than usual and the vertical arm longer, so that its catch will quickly act on
the fork and push the lever carrying the fork forward, and as before stated instantly
disengage the clutch before the brake mechanism has had time to stop the loom by
the action of the fork mechanism. Each of the pattern pendant levers which are
pushed out by the pattern pins has fulcrumed on its lower end a loose pawl lever

page_text: with weighted and disengaging tail which falls into gear on a notched recess formed
on the top of the cross tail across which the lower end of the pendant levers rest
and so is embraced between this and the pawl lever, and be thus actuated
positively in both directions (without the usual spring for actuating it in one
direction) as also the rod carrying the cross tail, so as to bring the proper steps of
the levers into action which bring their respective shuttles into action. This
arrangement has the effect of causing the pendant pattern levers to ride over their
moving pattern pins steadily whether rising to the higher pins or dropping from
these to the lower pins; while the high reversing or turning pins in raising the
pendants bring back the lower heel part of the pawl lever against the spindle of
the pressing spring levers so that the pawl is raised out of action during the return
traverse.
Instead of making the cam loose with an engaging and disengaging coupling for
stopping the action of the pattern barrel ratchet lever, that lever itself might be
jointed or hinged so as to be shifted laterally either off the cam or off the ratchet
wheel by the fork lever mechanism and so stop the action of the pattern barrel, as
soon as the weft was broken or absent.
The main features of these improvements might be applied to other forms of
looms than those particularly referred to herein.
Dated the 2nd December 100a
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to the Pattern and Weft-stop
Mechanism of Looms.
I, ALEXANDER GOVAN, of 346 Great Eastern Road, Glasgow, Lanarkshire,
Power Loom Tenter, do hereby declare the nature of my invention, and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement in writing, that is to say :-
This invention has reference to and comprises certain improvements in and
relating to the pattern check motions of looms for weaving, and specially applicable
to those with pattern pin barrels, for bringing the respective shuttles into action
or in line with the race. And which improvements have for their object the
instantaneous stopping of the pattern barrel mechanism through the weft fork
mechanism, when the weft thread breaks or runs out, and before stoppage of the
loom so as to prevent the necessity of the weaver turning back the pattern barrel
mechanism, and setting it when putting in a new shuttle as has been required to be
done heretofore by the pattern barrel running on until the loom has stopped; and
also in giving a more steady and positive action to the pattern lever and its
drawing and pushing rod mechanism which bring the proper shuttles into action.
And in order that my said invention and the manner of performing or carrying
the same into effect or practice may be properly understood, I have hereunto
appended an explanatory sheet of drawings in which the same reference letters are
used to indicate corresponding parts in all the figures where shown.
Figure 1 is a diagram end elevation, and Figure 2 a corresponding plan broken
away at -z in the centre showing sufficient of a check loom as will illustrate my
improvements applied thereto. While Figure 3 is a corresponding longitudinal
or side elevation looking from the back of the loom. And Figures 4 to 8 illustrate
detached views of details of the mechanism hereinafter referred to.
Referring to these drawings.-The improvements consist, according to one
arrangement as shown, in fitting the cam a shown in detached side and end views
Figure 4 which actuates the ratchet lever C of the pattern pin barrel D, loose on
the wiper or second motion cam shaft A, in place of rigid as heretofore, and in
fitting a sliding clutch coupling a² Figure 5 on the shaft A with its projecting

page_text: end a taking into a corresponding clutch recess a¹ on one side of the boss of
cam a. This coupling a² is preferably formed or fitted with a sliding pin a³
working in a corresponding hole or slot in a fixed clutch ring 6 secured
by a screw pin 2 to the shaft A on the opposite or back face of the
sliding clutch a², so that the clutch may be set to an exact position to
bring the loose cam a into action at the proper part of the revolution of the
shaft A to actuate the ratchet pawl lever C, of the pattern barrel D. A lever c
fulcrumed at c¹¹ is connected at its forked end to the sliding clutch a² so as to
operate same, and at its other end is attached to a bellcrank lever c³ fulcrumed
at c and which in turn is connected to a rod attached to a lever d¹ on the longi-
tudinal spindle d which through the lever d¹¹, is connected to the lever d² which
sets on the stop mechanism. The clutch mechanism is operated by the lever d²,
carrying the weft fork e, and by the weft fork actuating cam lever e¹, el, fulcrumed
at el, so that when the weft thread breaks the weft fork e catches on to the upper
notched end of lever e¹, and this action pulls the lever d", and raises the lever d',
which in turn through the lever and rod connection's c³, c², c instantly takes the
sliding clutch a² out of action with its cam a, against the power of a spring c, and
stops the taking up of the pattern barrel D; and is only put into action again by
the hand of the person after putting in the new weft and shuttle and setting the
weft fork mechanism again to take out the fork lever d² and stop mechanism and
set the clutch a² in to action. By an alternative arrangement, as shown in detached
plan view Figure 8, the belt and stop lever d² is fitted with a projecting arm d
and antifriction pulley d³ which acts on the short cam arm of a bellcrank lever d',
so that when the weft breaks this lever d is acted on and pushed out by the
pulley d³, and this in turn through the rod d actuates the lever c against the
power of the spring c to disengage the clutch a² from the cam a on the shaft A,
before the pattern barrel D commences its driving action. The cam a is also made
of an improved construction, as shown detached in Figure 4, so as to give it a
quickened or accelerated action on the driving side at a when this is raising the
end C of the lever C, that is giving a quicker action in a shorter segment of the
circle than the usual heart cam and so that its action will be such that the barrel D
will not begin to move until the weft fork mechanism has acted, and then when
the weft breaks or runs out, the weft fork will act and prevent the barrel D from
turning the ratchet tooth which the weaver requires to turn back; and the actuated
end C, of the ratchet lever C of the pattern barrel D is formed of an upwardly
curved shape for the cam a to raise and make it act to turn the. pattern barrel
during a short part of the revolution of the wiper shaft A. As shown detached in
Figure 7, the tappet lever f, which actuates the lever e" of the weft fork mechanism
is made to actuate this lever also through a short period of its revolution by
mounting a tappet antifriction pulley on a stud f" on the tappet lever f
adjustably secured in a slot f and making a curved or angled step on the
actuated end of the lever el which in this case is held down by a helical or other
light spring e to bring the lever down to rest in its normal lowest position on the
tappet shaft A, and so that the said antifriction pulley f¹ raises this lever e', ell,
an inch or so suddenly, the horizontal arm ell of the lever being made shorter than
usual and the vertical arm e' longer, so that its catch will quickly act on the fork e
and push the lever d² carrying the fork forward, and as before described instantly
disengage the clutch a' from the cam a on the shaft A, before the pattern barrel D
commences its driving action.
In applying these improvements to looms in which a rocking Dobbie pattern
card barrel is used, either with or without the pin pattern barrel D, as shown in
Figures 1 and 2 an additional ratchet wheel J¹ is mounted on the Dobbie pattern
card barrel spindle J, and a pawl lever J2, fulcrumed at j, is made to engage with
the teeth of same when a weft thread breaks and push it back one tooth. This
is effected in the arrangement shown by mounting a vertical rod J" under the pawl
lever J and passing it through a guide j', and having its lower end attached to the
arm Ja of a lever J³. J', fulcrumed at and having its arm J' connected to a

page_text: rod J³ which is attached to the aforementioned lever d¹. Thus when a weft thread
breaks or runs out, and the weft fork acts as before described the pushing up of
the lever d¹ also raises the rod J and arm J of the lever J3 J', and the other
arm J of lever is lowered and brings down the rod J", and lowers the pawl
lever J into the teeth of the ratchet wheel J¹ to turn it back one tooth by the
return oscillation of the barrel, and by this means the pattern card barrel is pushed
back the two shots it has run without weft.
Each of the pattern pendent levers G, G, which are pushed out by the pattern
pins D has fulcrumed on its lower end a loose pawl lever g with weighted and
disengaging tail gl, which falls into gear on a notched recess g" formed on the top
of the cross tail g² across which the lower end of the pendent levers G rest and so
is embraced between this and the pawl lever, and be thus actuated positively in
both directions (without the usual spring for actuating it in one direction) as also
the rod carrying the cross tail g2 so as to bring the proper steps of the levers
into action which bring their respective shuttles into action. This arrangement
has the effect of causing the pendent pattern levers G, G, to ride over their moving
pattern pins D¹ steadily whether rising to the higher pins or dropping from thèse
to the lower pins. The long pins D2 in raising the pendent levers G to alternately
reverse these across the pattern pins in the usual manner simultaneously act on the
usual buckle straps on the tumbling bar I to oscillate this bar and through the
pusher pawl lever I', reverse the barrel D, in the same manner as is fully described
and illustrated in the Specification of Muir and Mellwham's Patent No. 1437
June 18 1856. The same action brings back the lower heel part g' of the pawl
lever g of the pendent lever G (taken out of action for the time being against the
spindle of the pressing spring levers i, i,) so that the pawl g is raised out of action
with the cross tail g during the return traverse, and thus enable the other lever G
and its pawl g to work the pattern during its forward travel over the pattern
pins D¹.
By an alternative arrangement instead of using pawl levers g, g', on the pendent
levers G, G, two hangers or levers h, h, are mounted on a spindle / to press against
the spring levers i, i, in such a manner that they take the same motion as these
pendants over the pins D'. The lower ends of these hanging levers., h, are
connected to the barrel cross tail g² by means of springs 3 through a lever h".
By this means the cross tail 92 is held against the pattern pendant G, G, by
two springs h² while the pendant bearer spring 9' only requires to overcome one
of these.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
First. In looms for weaving the method or system of instantaneously stopping
the pattern barrel mechanism by the action of the weft fork mechanism when the
weft thread breaks or runs out and before stoppage of the loom, so as to prevent
the necessity of the weaver turning back the pattern barrel mechanism, and
resetting it when putting in a new shuttle, substantially as herein described in
reference to and by way of application shown in the accompanying drawings.
Second. In a method or system of stopping the pattern barrel mechanism of
looms when the weft thread breaks, the quickening or accelerating of the driving
surface of the cam on the wiper shaft, so that its action will be such that the barrel
will not begin to move until the weft fork mechanism has acted, and then when
the weft breaks or runs out, the weft fork will act and prevent the barrel from
turning the tooth which the weaver requires to turn back, substantially as
set forth.
Third. In a method or system of stopping the pattern barrel mechanism of looms
when the weft thread breaks, the mounting of the wiper or cam which operates the
pattern barrel loose on its shaft, in combination with a movable clutch which is
shifted out of gear by the action of the weft fork when the weft thread breaks or

page_text: runs out, substantially as herein described in reference to and by way of application
shown in the accompanying drawings.
Fourth. In a method or system of stopping the pattern barrel mechanism of
looms when the weft thread breaks, the arrangements and combinations of levers
and rods between the weft fork and the clutch on cam shaft, substantially as and
for the purposes herein described in reference to and shown on the accompanying
drawings.
Fifth. In a system of stopping the pattern barrel mechanism of looms when the
weft thread breaks, the method of quickly operating the weft fork cam lever and
accelerating the fork hammer action so as to instantaneously disengage the clutch
before the pattern barrel starts to drive, substantially as herein set forth.
Sixth. In a system of stopping the pattern barrel mechanism of looms when the
weft thread breaks, the method of turning back the Dobbie pattern barrel the card
for the two shots it has run without weft, substantially as set forth.
Seventh. In a method or system of stopping the pattern barrel mechanism of
looms when the weft thread breaks, the fitting on the lower end of each of the
pattern pendent levers of a loose pawl lever with weighted and disengaging tail
which falls into gear with the cross tail or the equivalent hanging levers shown,
substantially as and for the purposes herein described in reference to and shown in
the accompanying drawings.
DL 11002
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.