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Патент USA US2407774

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Sept. _17, ‘1946. '
N. FLETCHER
2,407,773
‘WEFT TENSION FOR AXMINSTER LOOMS
' Filed Feb. 3, 1945
2 Sheets-Sheet 1
1/
.Sépt- 17,1945-
'N. FLETCHER
'
2,4@7,773 v
WEFT TENSION FOR AXMINSTER LOOMS >
Filed Feb. 3, 1945 '
2 Sheets-Sheet 2
2,407,773
Patented Sept. 17, 1946
UNITED STATES PATENT OFFICE r‘
2,407,773
WEFT TENSION'FOR AXlVIINSTER LOOMS
Norman Fletcher, Worcester, Mass., assignor to
Crompton & Knowles Loom Works, Worcester,
Mass., a corporation of Massachusetts
Application February 3, 1945, Serial No. 575,991
8 Claims. (Cl. 7139-123)
1
"
2
thread break, however, the whip stick will not
This invention relates to improvements in weft
be restrained by the weft or the tension and will
tensions for Axminster looms and it is the general
rise to an abnormally high position to close an
object of the invention to provide a weft tension
electric switch to effect loom stoppage. In this
automatically controlled by the whip stick which
way the whip stick serves not only to effect appli
takes up slack in the weft.
cation of tension to stop itself at the normal
Axminster looms are customarily provided with
raised position to permit continued loom opera
a whip stick which takes up slack weft between
tion, ‘but also acts upon weft breakage to stop
the stationary package of yarn and the weft nee
the loom.
.
dle for the purpose of keeping the weft taut. A
With these and other objects in view which will
tension device located between the whip stick 10
appear as the description proceeds, my invention
and the weft package is usually under control of
resides in the combination and arrangement of
parts hereinafter described and set forth.
a loom driven cam to apply and release tension
at regularly recurring intervals during loom op
eration.
In the accompanying drawings, wherein a con
The cam is usually so timed as to re
lieve tension when the weft needle is being in
serted into the shed and then apply tension
when the needle is being removed from the shed.v
By such an arrangement the tensioning mecha
nism is under control of the loom driven cam
with the result that if the loom should be stopped
with the needle partly inserted into the shed the
tension will be off and the whip stick can snap
upwardly and create slackness in the weft. In
wide looms which require the use of a long needle
the eye end of the latter is subject to consider
able vibration which may result in wrapping the
weft around the needle should the latter come to
rest during its insertion stroke. When the loom
is again started up the weft breaks due to snarl
ing at the needle eye.
It is an important object of my present inven?
tion to provide a tension which shall be under
control of the whip stick throughout the loom
operation and independently of the position of
the needle. In this way I am able to make the
operation of the tension conditional upon the po
sition of the whip stick and dispense with the
aforesaid cam and the several connecting parts
between it and the tension, and I am also able
venient embodiment of my invention is set forth,
Fig. ‘1 is a diagrammatic view setting forth
the relation between the fabric, the needle, the
whip stick and stationary package of weft sup
ply, together with my improved tension mecha
20
nism,
.
Fig. 2 is a front elevation of the needle rail and
associated parts and having my invention ap
plied thereto,
’
Fig. 3 is an enlarged front elevation of the
25 tension mechanism showing the same in the posi
tion which it occupies when the needle is being
inserted into the shed,
Fig. 4 is a view similar to Fig. 3 but showing
the conditions existing when the whip stick is
30 raised to its normal position,
Fig. 5 is an end elevation looking in the direc
,
tion of arrow 5, Fig. 3, and
Fig. 6 shows diagrammatically a circuit which
can be used to effect loom stoppage.
'
Referring to Fig. 2, I have shown a framework
It normally extending'to the right of the loom
designated at H. The framework ll] supports
a needle rail 12 along which slides a carrier l3
to which is attached the needle N. Any ap
to keep the thread taut during upward movement 40 proved driving mechanism for the needle may
be employed, such as a cable l4 wrapped around
of the whip stick should the needle stop while
a drum I5 which‘ receives oscillating motion from
a rack l6 and a pinion IT. The cable is‘ trained
In Axminster looms it is customary to use a
around pulleys l8 and is then attached to the
weft guide near the inner end of the needle rail
and associate this guide with a ?lling stop mo 45 needle carriage l3. During normal loom opera
passing into the shed.
tion the rack and pinion oscillate the drum l5,
tion operative to stop the loom should the weft
causing the needle ?rst to move into and then
break. It is another object of my present in
out of the warp shed, these movements corre
vention to provide stopping mechanism which
sponding to a movement to the left and then to
Will be operated by the whip stick when the weft
breaks. In this feature of my invention the whip 50 the right as viewed in Fig. 2.
The weft W is supplied by a stationary package
stick as it rises automatically effects application
20
and is led through‘ a tension mechanism de
of tension to the weft with the result that the
scribed in detail hereinafter and designated gen
stick will stop at a normal raised position due to
erally at T. From the tension mechanism the
operation of the tension mechanism in holding
the weft provided the weft is intact. Should the
weft leads to an eye E in a whip stick 2|. A pair
2,407,773
3
,
of eyes 22 of usual form are mounted on the in
ner or left end of the needle rail as viewed in
Fig. 2, and serve as guides for the weft W. It
4
from eye 40 to eye 4! must pass between the pads‘
43 and 44 and be subject to any pressure which
these pads may exert upon it. In order that the
frictional force exerted by the pads 43 and 44
upon the weft may be varied, I employ a
spreader arm 50 pivoted at 5! to the support 3|
and having the end thereof remote from pivot
has been customary in the past to associate the
guides 22 with a ?lling or weft stop motion, but
it will be understood from the following descrip
tion that this stop motion may be omitted in
asmuch as its function is performed by a part
of my invention.
5! formed wedge shaped as indicated at 52, Fig. 5.
A stud 55 on head 34 is spaced to the right of the
Referring particularly to Fig. 1, the fabric F
has right and left selvages S and S’, respectively,‘
from which extend rearwardly the binder warps
_ axis of stud 33 and has pivoted thereto the upper
end of a connector 55. The lower end of con
nector 56 is pivoted to a second stud 57 carried
by the spreader arm 50.
B which form the shed. 'A selvage shuttle 23 of
usual form is located at the left side of the loom
When the whip stick is in its normally raised
and cooperates with the needle N when the latter / position as indicated in full lines in Fig. 2 the
is fully inserted into the shed to form the selv'a‘ge' ’ link 5'6 depresses arm 50 and moves the wedged
' is’. As the needle moves tothe left as viewed in
, part 52 thereof downwardly out of operative rela
Fig. l the weft which is attached to selvage S
tion with respect to the pads 43 and 44. Under
unwinds from package 29 and passes through‘
these ‘conditions the spring 46 pushes the plate
tension T, eye E, guides-22 and to the needle N. 20 43 rearwardly against the weft, exerting a resist
After the weft is caught by the shuttle 23 the
needle N ‘is moved to the right during which
‘movement there is no need for additional weft.v
' ance to movement of the weft between eyes 40
and 4! dependent upon the amount of force
exerted by spring 43. This is the condition which
While the needle is being inserted into the shed
exists ‘at the beginning of a weft inserting stroke
‘it places “the weft'W under considerable tension 25 of the needle, and as the latter moves into the
with the result that the whip stick 2! moves
‘shed not shown and creates demand for ‘weft, the V
down to the :dotted line position shown in Fig. 2,
whip ‘stick will ‘move down because of the fact
but upon withdrawal of the needle when the de
that the weft is held ‘by the pads ‘43 and '44. As
mand for weft has temporarily ceased the whip
the whip stick descends, however, link '56 lifts
stick rises to the normal raised position shown in
arm at and causes Wedge encl 5.2 to enter be
full lines, Fig. 2.
tween the disks or friction plates and’ separate
rThe matter thus far described of itself forms
no part of my present invention ‘except as in- '
the latter by moving the front plate 43 forwardly
against the action of spring ‘4%. ‘This removes
dicated hereinafter- and may operate and be con
the tension force on the weft and the latter
structed in the usual manner.
is free to move from the package '20 through the
In carrying my invention into'effect I provide
'eyes 49 and 4-1 to the eye E of the whip stick and
the needle rail "with a r‘earwardly projecting
thence to the needle. So long as the needle con
‘st-and St to which is secured "an upright support
tinues moving toward the left as ‘viewed in Fig. 1
'3! . This support is provided'withan upper bear
vthere will be sufficient demand for ‘weft to main
ing 32 in which is rotatively mounted a stud 33 40 tain the whip stick in down position and the
the ‘forward ‘end of which has secured thereto
tension will therefore be removed-from the weft.
a head 34 to which the whip stick 2! is held by
As soon as the needle comes to rest in the shed
means of a clamp plate 35. An arm 1% ‘secured
‘preparatory to its removal the whip stick starts
to ‘the rear end ‘of the stud 33 is attached to the
:to rise vclue t'o operation-of spring 37!’, but in doing
upper ‘end of ‘a tension ‘spring 3’! the lower end 4'5 so acts through connector 56 ‘to depress 'a-rmr5ll,
"of which ‘is connected to ‘a lug 38 projecting rear
whereupon ‘spring 46 moves friction plate 43 rear
wardly from the support ‘3!. ‘The effect of the
spring ‘3? is to ‘tend to turn the stud, head and
whip‘ 'sti'c-k'in ‘a right hand direction as viewed
in Fig. 3, but the spring will'yield to permit down
ward movement of the ‘whip stick.
“
Mounted on the supportv 3! are right ‘and left
‘guide eyes 4% and 4!, respectively, ' ‘preferably
made of some wear resisting material, such as
porcelain, and through which the weft‘W passes.
wa'r'dly to ‘reestablish ltensioni-nglforce on ‘the weft.
When this force reaches its maximum the weft
is held "by the tension mechanism and further
0 upward movement of the Whip stick is ‘arrested.
From the matter thus far described it will be
noted that the tension exerted on ‘the weft by the
pads 43 and 44 is conditioned in the sense that
it is dependent for its operation upon the posi
stick and not upon the position
55 tion of the
of a regularly driven part acting in timed relation
with the loo-m. It for this reason-that should
the needle stop half way in the shed during ‘its
A ‘stud '42 is mounted on and projects forwardly
from the support 3'! and is surrounded‘ by front
and ‘back tension pads or plates 43 and 44, re
spectively, mounted loosely on stud 42. The rear
inserting stroke the whip stick will immediately
pad rests ‘against a boss 45 on the ‘support 3i,
60 rise and in ‘doing so will cause spring :46 to exert
while the front pad 43 is 'slidably ‘mounted on
a restraining force ‘on the weft, holding ‘the latter
the stud 42 ‘but is‘ held normally in ‘rear position
by ‘means of a compression spring 45 ‘located be
taut and thereby preventing the ‘snarling which
has existed heretofore in tension mechanisms de
tween the front pad ‘43 ‘and an adjusting nut 41
threaded onthe‘s‘t'ud 42.
Spring 46 normally
pendent'uponacam.
V
.
'
‘
V
65
The second feature of v‘my invention ‘relates
holds the stud 42 in the position shown in Fig. 5.
to a stop mechanism operated by the whipstick
A look nut 48 may be used to hold the nut 47 in
and includes an electric switch 68 mounted on
any adjusted position. The purpose of the spring
‘a horn 61 ‘extending upwardly from the support
46 ‘is to tend normally to move the plate 43 rear
3!. This switch has an arm ‘62 ‘which ‘is above
wardly against plate 44, and by means of the 70 the ‘whip stick when ‘the 1atter is vin its normal
nut 47 the force exerted by the spring ‘46 may be
raised position. Under operation when the
varied to alter the 'fo‘rc'e'exerted between the ad
thread ‘is intact the whip stick rises and falls
jacent faces of the pads 43 and '44.
v
without contacting the arm 62 due to the fact
The eyes 49 and 4! and the pads are related
that the tension mechanism is controlled by the
as shown in Fig. 3 so that the weft in passing 75 Whip stick as the latter rises and ‘stops upward
2,407,773
6
and moving downwardly during weft inserting’
movements of the needle, tension means normally
operative to prevent movement of weft from the
package to the whip stick eye, and control'means
‘movement of the whip‘ stick before it strikes the
arm 62, the far end of the weft being held at
selvage S’. If, however, the weft thread should
break at any point to the left of the'tension
for said tension connected to and operated by
mechanism as viewed in Fig. 1 it will reeve UK
through the eye E of the whip stick and the
latter will therefore be raised by spring 31 to
an abnormally high position and strike arm 62
to cause closure of switch 60.
'
Fig. 6 shows diagrammatically a loom control
ling circuit which may be used with switch 60.
A solenoid 10 is normally deenergized and per
mits the shipper handle ‘H to remain in operat
ing position so long as switch 60 is open. When
the weft breaks and the whip stick rises to the
dot and dash line position shown in Fig. 6 to
close switch 60, current flows in the following cir
the whip stick and operative when the whip‘stick
moves downwardly to cause the tension to re
lease the weft and operative when‘the whip stick
returns to normal raised position to permit the
10 tension to reestablish normal holding relation
cuit: transformer 12, wire 13, switch 60, wire 14,
solenoid ‘Ill, and wire 15 to ground G, and thence
back to the transformer through grounded wire
16.
The solenoid thereupon moves the shipper
handle] I to stopping position.
From the foregoing it will be seen that I have
provided a tension mechanism for the weft of an
Axminster loom conditional for its operation
throughout the loom cycle on the position of the
whip stick and operated independently of any
ship with' respect to the weft. -
3. In conditional weft tensioning and releasing
mechanism for an Axminster loom having a whip
stick through the eye of which weft extends from
a stationary weft package to a weft inserting
needle, the whip stick being normally raised "
and moving downwardly during weft inserting
movements of the needle, a tension mechanism
comprising clamp members between which the
weft extends, said clamp members being nor
mally close together and operative to prevent
weft from passing from said package to the whip
stick eye, and control means for the tension
mechanism normally out of controlling relation
with respect to said clamp members but caused
to separate said clamp ‘members by a force de
rived from the whip stick when the latter de
scends to permit weft to move from between
regularly moving part of the loom, such as a ‘
said clamp members to the whip stick eye when
cam. It will also be seen that when a demand
stick moves downwardly.
for weft is created ‘at the beginning of the needle 30 the4.whip
In conditional weft tensioning and releasing
inserting stroke the whip stick will be depressed
mechanism for an Axminster loom having a
and effect a simultaneous release of the tension,
whip stick through the eye of which weft ex
thereby permitting the weft to pass freely from
tends from a stationary weft package to a weft
the package 20 through the whip stick eye to the
inserting
needle, the whip stick being normally
35
needle. If the needle should be arrested while
raised and moving downwardly during weft in
moving into the warp shed the whip stick will
serting movements of the needle, a tension mech
be raised to take up any attendant weft slack
anism comprising a pair of clamping pads be
and in rising will apply a braking force to the
tween which the weft extends from said package
weft by means of pads 43 and 44. It will further
to the whip stick eye, means normally holding
be seen that the tension which is automatically 40 said pads against the weft ?rmly enough to
controlled by the position of the whip stick op
prevent said weft from moving from the package
erates to stop the whip stick in its upward move
to the whip stick eye, and control mechanism
ment at a position just below the arm 62 of the
operated by the whip stick and ‘effective when
switch 60 when the thread is intact. If the
said stick moves downwardly to separate said
thread should break, however, the spring 31 will
pads to permit weft to pass between them, said
cause an additional upward movement of the
control mechanism being moved out of control
whip stick to cause closure of switch 60 to effect
ling position with respect to the pads by the whip
loom stoppage.
stick when the latter rises to permit said means
Having thus described my invention it will be
to cause the pads to reestablish holding rela
seen that changes and modi?cations may be 50 tionship with respect to the weft.
made therein by those skilled in the art without
5. In conditional weft tensioning and releasing
departing from the spirit and scope of the inven
mechanism for an AXminster loom having a whip
tion and I do not wish to be limited to the de
stick through the .eye of which weft extends
tails herein disclosed, but what I claim is:
from a stationary weft package to a weft in
1. In conditional weft tensioning and releas
ing mechanism for an Axminster loom having a
whip stick through the eye of which weft ex
tends from a stationary weft package to a weft
inserting needle, the whip stick being normally
raised and moving downwardly during weft in
serting movements of the needle, 3, weft tension
between said stationary package and said eye of
the whip stick normally operative to prevent pas
sage of weft from said package to the whip stick
eye, and operating connections between the whip
stick and said tension effective when the whip
stick moves downwardly to alter said tension by
a force derived from said whip stick and cause
serting needle, the whip stick being normally
raised and moving downwardly during weft in
serting movements of the needle, tensioning
mechanism comprising a pair of pads between
which the weft passes from said package to
the whip stick eye, a wedge operativ'ely con
nected to and moved by the whip stick, and re
silient means normally holding the pads in posi
tion to prevent weft from passing from said ten
sioning mechanism to the whip stick eye, said
wedge effective when moved by downward move
ment of the whip stick to separate said pads
to permit passage between them of the weft and
said wedge moving away from said pads when
the tension to permit passage of weft from said
the whip stick rises to permit said resilient means
package to the whip stick eye.
to reestablish said normal holding relation of
2. In conditional weft tensioning and releas
said pads with respect to the weft.
ing mechanism for an Axminster loom having a
6. In conditional weft tensioning and releasing
whip stick through the eye of which weft extends
mechanism for an Axminster loom having a
from a stationary weft package to a weft insert
‘ing needle, the whip stick being normally raised 75 whip stick through the eye of which weft ex
2,407,773
tends from a ‘stationary weft package to a weft
inserting needle, the whip stick ‘being normally
operated by the whip stick and effective when
the latter is in normal position to permit said
tension mechanism to apply the ?rst named
force to the weft and e?ective when the whip
stick moves to operating position to move said
tension mechanism by a force derived from said
whip stick to said other position thereof to re
lieve the tensioning force on the weft.
movement to another position to permit passage
8. In conditional Weft tensioning and releas
of weft from the package to said Whip stick eye, 10
ing mechanism for an Axminster loom having
and means operated by the whip stick ‘effective
a whip stick through the eye of which weft ex
when the said stick moves downwardly to move
tends from a stationary weft package to a weft
said tension mechanism to said other position
inserting needle, the whip stick moving from
and effective when said whip stick rises to permit
the normal position thereof to an operating posi
said tension mechanism to return to said one
raised and moving downwardly during Weft in
serting movements of the needle, tension mech
anism normally tending to occupy one position
in which said tension mechanism prevents move
ment of weft from said package to the whip
stick eye, said tension mechanism ‘capable of
position.
‘
15 tion during weft inserting movementsof the
needle, tension mechanism operative either to
7. vIn conditional weft'tensioning and releas
apply resisting force to the weft to preventthe
ing mechanism for an Axminster loom having
latterfrom moving ,from the ‘package to the whip
a whip stick through the eye of which weft ex
tends from a stationary weft package to a weft 20 stick eye :or relieve said resisting force to permit
weft to pass from the package to ‘the whip stick
inserting needlegithe whip‘stick moving from the
eye, and means operated by the whip stick as
normal position thereof to an operating position
the latter moves from the normal position there
during weft inserting movements of the needle,
of to the operating position thereof and :back
tension mechanism when in one position apply
ing suflicient tensioning force to the Weft to pre 25 to said normal position to control said tension
mechanism to ‘effect application of said resist
vent the latter from moving from said stationary
ing force to the ‘Weft when the stickis in normal
package to the whip stick eye, and said tension
position and relieve application of said resisting
mechanism when in another position relieving
force ‘to the weft when the whip'stic'k is in
said tensioning force to permit weft to pass from
operating vposition.
7 said package to said ‘whip stick eye, and means 30
NORMAN FLETCHER.
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