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Патент USA US2118844

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‘May 31.1938--
"FQHALEETAL '
CIRCULAR LOOM
Filed ‘Nov. 12, 1936
f 2118344
Patented May 31, 1938 ‘
I
uNrrEn STATES,
2,118,844
‘
nun won
Frank Corbyn me and llama nuseen Yorke,
Spondon,. near Derby, England, assignora to
ace ?orporation oil America, a oorpora-_
tion of Delaware
Application November 12, 19st, Serial No. intact
in Great Britain December 2?, 1935
(Cl. 139-13) '
The present invention relates to circular looms, ber vagainst the weftthread is adjusted in ac- '
cordance with such tension. Thus, while the de- i. e., looms in which the warp threads. are ar
ranged in a circle and in which the weft is laid tector member is still‘ capable of operating on
by means of a relative circular motion between ' weft breakage, mere slackness in the weft pro
ceeding from the supply is inscient to bring 5
5 the shuttle or shuttles and the warp threads.
Such relative circular motion between the shut
tle or shuttles and the warps, together with the
substantial concealment of the shuttle or shut
tles within the warp shed or sheds, renders dif
lo ?oult the detection of broken weft threads and
the necessarily immediatecommunication of such
breakage from the shuttle to means which serve
to stop the weaving operation.
It is, of- course, of the utmost importance to
l5 stop the loom immediately upon weft breakage,
and especially so in multi-shuttle looms, where if
the loom continues weaving with one weft ab
sent, a flaw results that cannot be recti?ed.
Thus, even if stoppage is eifected so quickly that
"20 only one weft from another shuttle has been laid
in the portion of the fabric where the breakage
of weft has occurred, it may not be possible to
“unweave” that weft-especially as any "unweav
ing” might probably have to extend to the wefts
25 laid by the other shuttles in the rest of the iabric
'
periphery.
-
‘about the operation of the detector member.
By way of example a form'of apparatus accord
ing to the invention will now be described in
‘greater detail with reference to the accompany
ing drawing of which '
10'
1 Fig. 1 is a front elevation of the apparatus in- ,
corporated in a shuttle;
'
Fig. 2 is a front elevation of- part of Fig. 1, on
larger scale; and
Fig. 3 is a plan of part of Fig. 1.
'
15
Referring to Fig. 1 the shuttle t is of the type
described in U. S. Patent No. 2,050,328 and is
supported and positioned in the loom by rotata
ble vane wheels 5 which are mounted on a shaft
t and engage pairs of ?anged rollers '3 carried by 20
the shuttle.
,
Weft thread 8 proceeds from a supply spool ‘t
to a guide it from‘ which the thread passes
through a guide H, held in an amrture formed
in a plate it, to the fell it of the fabric.‘ Dis- 25 /
posed on the plate It in a position to engage the
thread 8 asv it passes from the spool t to the
guide it is a device for tensioning the thread.
The device comprises a pair of smooth discs‘ ill
mounted on a central stud it and urged into 30
According to the invention, weft breakage is
detected by a member carriedby the shuttle and
disposed in the path of the weft thread between
30 thread 'tensioning means and the fell of the fab
ric. Release of the detector member upon break ‘ contact with each other by a compression spring
It, the pressure of which is adjustably controlled
age of the weft causes a member under control
of the detector member to be propelled through
one ‘warp sheet to bring about the operation of
35 means disposed outside the warp shed for bring
ing weaving to an end.
These last-mentioned
means can be arranged to operate with great
rapidity, e. g., by operating electrically as de
scribed in U. S. Patent No. 2,027,459 so that weav
40 mg can cease in time for the fault caused by the
weft breakage to be remedied. The invention
has the advantage, moreover, that the stop mech
anism is not in?uenced by slackness of ‘the thread
delivered from the supply, the thread-tensioning
45 means not only delivering the weft at the re
quired weaving tension, but also guarding against
the release of- the detector member by slackly
wound weft or slackness resulting from slight
overrunning of a rotatable weft spool or an arm
by a nut H which screws on the stud lb.
.Between the tensioning device it and the guide
it is a detector member formed as a two-armed 35
lever l8, l0 pivoted at 20 (Fig. 2) to an upstand
ing portion of the plate l2 and urged into clock
wise rotation about the pivot by a spring‘ ml
(Fig. 3). The arm It carries a thread guide ti
which bears down on the tensioned thread t, 4,0
the thread normally preventing the lever from '
rotating about its pivot.
When the detector
member is'in the normal (thread-engaging) po-'
sition the arm it bears against an arm 22 of a
bell-crank lever comprising arms 22, ?t pivoted 45'
at M to ‘the plate 02. A ?at coil spring 2% as
sociated with the bell-crank lever tends to ro
tate the lever in an anti-clockwise direction, such
motion being restrained by the arm it of the
of) serving to unwind weft from astationary spool
when the loom stops.
detector member.
tion the thread tensioning means is adjusted in
accordance with the weaving tension desired in
55 the‘weit, and the pressure of the detector mem
the tensioning device it has no e?ect on the
.
50
As will be apparent from the drawing slack‘- _
At the commencement of the weaving opera- " ening. of the thread d between the spool t and
tension in that part of the thread t extending
from the tensioning means it to the tell it of M
2
2,118,844
the fabric and consequently cannot bring about
the operation of the detector member l8, I9 and
tion of means disposed at the other side of the
the bell-crank lever 22, 23.
2. In a circular loom, a shuttle, a spool in said
shuttle for supplying weft to be laid at the fell
.
0n breakage of the weft thread 8, however,
restraint is removed from the‘ guide 2| of the
detector member with the result that the mem
ber rotates clockwise about its pivot 20 under the
in?uence of the spring IN and frees the bell
crank lever 22, 23. The bell-crank lever imme
diately rotates anti-clockwise about its pivot 24
under the in?uence of the spring 25 with the re
sult that the arm 23 of the lever is urged be
yond the width of the plate l2 and through a
sheet of the relatively moving warm threads (a
few of which are illustrated diagrammatically
at 21 in Fig. 3) which push the arm 23 and tend
to continue the anti-clockwise rotation of the
bell-crank lever.
'
This movementof the arm 28 brings it into con
20 tact with a pin 23 outstanding from a rod 29
which is longitudinally disposed on the plate i2
with the result that the rod is: propelled rearward
ly through the warp sheet 21 and contacts with a
feeler 30 (Fig. 3). The feeler 39 actuates an elec
25 tric switch 3! of the type described in U. S. ap
plication S. No. 98,274 ?led 28th,Aug‘ust, 1936 and
which operates means for bringing weaving to an
end. For full details of the means for bringing
weaving to an end reference may be had to U. S.
30 Patent No. 2,027,459. In Fig. 1 the rod 29 is shown
35,
broken o? short of the tensioning device it for
convenience of illustration of the tensioning de
vice and the detector member l8, i9. The end
of the. rod is shown in full however in Figs. 2
and 3.
The arms 22, t8 of-the bell-crank lever are
capable of independent rotation about the pivot
24 and are normally maintained in the angular
relation shown in Fig. 3 by' a ?at coil spring 32
40
an end of which is secured to each arm of the
lever. In this manner the arm 22 of the lever
normally engaged by the arm I 9 of the detector
member need only rotate sumciently on release‘ of
45 the detector member to bring the arm 23 into
contact with the relatively moving warp threads
21 which then continue the rotation of the arm 23
independently of the arm 22.
When the arm 23v is released from the warp
50 threads 21 on repair of the breakage in the weft
thread 8 the spring 32 connecting the two arms
of the bell-crank lever returns the arm 23 auto
matically to the normal position (viz. as shown
in Fig. 2) in readiness for the resetting of the le
55 ver and the detector member.
‘
Having described our invention. what we de
sire to secure by Letters Patent is:
1. In a circular loom, a shuttle for laying weft
thread at the fell of the fabric, thread tension
60
ing means disposed in the path of the thread at a
warp sheet for bringing weaving to an end.
.
of the fabric, thread tensioning means disposed
on the shuttle in the path of the thread at a point
between the supply and the fell of the fabric and
adapted to impart tension to that length of the
thread which extends from the tensioning means
to the fell of the fabric, a pivoted detector meml
ber carried by the shuttle and adapted to be re- .
strained from rotating about its pivot by the ten-4
sioned length of thread, and to be freed for move.
ment on breakage of such thread, the tension im
parted to the thread by the tensioning means're 15
straining the detector ‘member irrespective of the
state of the tension in the thread extending from
the supply to the tensioning means, and a pivoted
member controlled by the detector member and
adapted on freeing of the detector member to ro 20
tate about its pivot so as to propel an extension
of the member through a warp sheet to bring
about the operation of means disposed at the
other side of the warp sheet for bringing weav
ing to an end.
.
-
25'
3. In a circular loom, a shuttle for laying weft
thread at the fell of the fabric, thread tensioning
means disposed in the path of the thread at a
point between the supply and the fell of the fab
ric and adapted to impart tension to that length 30
of the thread which extends from the tensioning
meansto the fell of the fabric; means for ad
justing the degree of tension imparted to, the
thread by the tensioning means, a movable de
tector member carried by the shuttle and adapted 35
to be restrained from movement by the tensioned
length of thread and to be freed for movement on
breakage of such thread,‘ the tension imparted
to the thread by the tensioning means restrain
ing the detector member irrespective of the state 40
of the tension in the thread extending from the
supply to the tensioning‘ means, and movable
means controlled by the detector member and
adapted on freeing of the detector member to be
propelled through a warp sheet to bring about 45
the operation of means disposed at the other side
of the warp, sheet for bringing weaving to an end.
4. In a circular loom a shuttle, a spool in said
shuttle for supplying weft to be laid at the felt
of the fabric, thread tensioning means disposed
on the shuttle in the path of the thread at a point
removed from the fell of the fabric, a pivoted de- '
tector member carried by the shuttle, a spring
adapted to urge said detector member to rotate
about its pivot, the detectorv member being re 65
strained from moving by the tensioned thread
extending between the tensioning means and the
fell of the fabric and freed for movement on
thread breakage, and a bell-crank lever pivoted
on the shuttle and normally restrained from ro
point between the supply and the fell of the fab- . tating about its pivot by an extension of the de
80
ric and adapted to impart tension to that length
of the thread which extends from the tensioning
tector member, and adapted on freeing of the
means to the fell of the fabric, a movable detec
of the lever through a warp sheet to bring about
the operation of means disposed at the other side 65
of the warp sheet for bringing weaving to an end.
65 tor member carried by the shuttle and adapted to
be restrained from movement by the tensioned
detector member to rotate so as to propel an arm
length of thread and to be freed for movement on
5. In a circular loom a shuttle, a spool in said
breakage of such thread,‘ the tension imparted
to the thread by the tensioning means restraining
70 the detector member irrespective ofthe ‘state of
the tension-in the thread extending from the 'sup
ply to the tensioning means, and movable means
controlled by the detector member and adapted
shuttle forsupplying weft to be laid at the fell of
on freeing of the detector member to be propelled
through a warp sheet to bring about the Opera
the fabric, thread tensioning means disposed on
the shuttle in the path of the thread at a point 70
removed from the fell of the fabric, a pivoted de
tector member carried by the shuttle, a spring
adapted to urge said detector’member to rotate
about its-pivot, the detector member being re,
strained from movingby the tensioned thread 76
Q,118,844
extending between the tensioning means and
the fell of the fabric and freed for movement on
thread-breakage, a bell-crank lever pivoted on
the shuttle, an extension formed on the detector
member and adapted to contact with said bell
crank lever so as to restrain‘ said lever against
movement during normal‘weaving in the loom
and to be moved out of contact with the lever
by movement of the detector member on thread
10 breakage, and a spring in association with said
lever and adapted to rotate said lever about its
pivot on removal of restraint from the lever so
as to propel an arm of the lever through a warp
sheet to bring about the operation of means dis-V
posed at the other side of the warp sheet for
bringing weaving to an end.
6. In a circular loom, a shuttle for laying weft
thread at the fell of the fabric, thread-tensioning
‘
iii
ing means and the fell oi the fabric and to be
freed for movement on thread breakage, a pivot
on the shuttle, two arms rotatable about said
pivot, a spring connecting said arms and adapted
to hold said arms in opened relation in the form
of a bell-crank lever, an extension formed on said
detector member and adapted to contact with one
of said arms so as to restrain saidyarms against '
movement during normal weaving in the loom >
and to be moved out of contact with said arm by 10
movement of the detector member on thread
breakage, a further spring in association with
said arms and adapted to rotate said arms about
the pivot on removal of restraint from said arms '
so as to propel one of said arms through a rela- 15
tively moving sheet of warp threads, said propelled arm being adapted to be rotated about '
the pivot relatively to the other arm by the warp
means disposed in the path of the thread at a threads so as toi‘bring about the operation of
means disposed at the other side of the warp. 20
20 point removed from the fell of the fabric, a mov
I
able detector member carried by the shuttle and sheet for bringing weaving to an end.
adapted to be restrained from movement by the
tensioned threadextending between the tension
~
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