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Патент USA US2119573

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Juné 7, 1938.
R. DEWAS
'
2,119,573
NEEDLE OF WEAVING LOOMS
Filed Dec. 29,
1936 '
,4 T TOE/VEKS
‘2,119,573
Patented June 7, 1938 "
UNITED STATES PATENT OFFICE
2,119,573
NEEDLE 0F WEAVING LOOMS
Raymond Dewas, Amiens, France
Application December 29, 1936, Serial No. 118,065
In France December 31, 1936
(Cl. 139-127)
5 Claims.
The invention concerns needle weaving looms
in which the holding member of the pulling nee
dle consists of a clamp with two branches which
are in springy contact the one with the other and
5 cooperating with a releasing blade which does
away with the contact between the said branches
when the needle emerges from the shed after
having inserted the shoot in it.
It has been notedthat with holding members
of a springy clamp with two branches between
which the end of the thread presented in the
centre of the shed by the conveying needle, is
seized when the exchange is made.
Figs. 1 to '7 show one form of execution of a
pulling needle effecting the exchange of the
thread when the two needles meet, the applica
tion of the invention offering, in this case, the
advantage of assisting this exchange of the.
thread between the said needles.
10
Fig. 1 is a plan view from above of the clamp
tension on the thread unwinding from a bobbin 7
which terminates the pulling needle;
or coming from any other source of supply, it
Fig. 2 being an elevation;
.
happens that the end of this thread, caught be
Fig. 3 is a View in‘cross section on the line
tween the two branches of the springy clamp,
3—3 of Fig. 2 showing the position of the releas 15
15 slides between the contacting surfaces of the
ing blade, and
said branches and escapes from them, which pro
Fig. 4 is an elevation of the face of the needle
duces objectionable results, such for example, as
10 of this type, as the result of an abnormal over
irregularities in the selvedges or in the fabrics
themselves.
To overcome these objections the strength of
the grip of the holding member of the said pull
on the opposite side to that shown in Fig. 2;
Fig. 5 is a plan view from above showing three
successive positions of the thread during its ex 20
ing needles may be increased, but in this case
veying needle to the pulling needle;
other di?iculties appear.
.
The object of the invention is to obviate these
25 objections and it is based on the idea of caus
ing the strength of the grip exerted on the end
of the thread caught between the branches of
the springy clamp to increase automatically each
change, that is to say its passage from the con- _
.
Fig. 6 being a similar view, showing one of the
last positions of the thread after the exchange,
the pulling needle withdrawing at this moment
towards the selvedge of the fabric;
Fig. 7 is an elevation showing certain of the
positions indicated in Figs. 5 and 6';
Figs. 8 to 12 show a similar form of execution
time that an abnormal increase occurs in the
in the case of a pulling needle effecting the ex
30 tension of the said thread as it unwinds, and
that, as function of the said increase, by employ- , change of the thread with the conveying needle,
ing for this purpose the action itself of the ab
normal increase in the tension of the thread, for
operating on the springy branch of the said
35 clamp in such a way as thereby to increase the
pressure
branch.
proportionately
against
the
other
'
For this purpose the invention consists in pro
viding means on one or on thetwo branches of
40 the said springy clamp, which allow the thread
55
.
Fig. 8 is a plan view from above similar to
Fig. 5;
35
i
Fig. 9 a view similar to Fig. 6;
Fig. 10 an elevation similar to Fig. 7;
Fig. 11 an elevation of the face opposite to
that shown in Fig. 10, and
Fig. 12 a View in cross section on the line 40
coming from the bobbin and seized in the clamp
I2—I2 of Fig. 9.
to come into contact with the outer surface of
The pulling needle (Figs. 1 to 4) is of the
kind described in the above mentioned patent
application and is devised with a view to the
realization of the invention; the holding mem_ 45
her for the thread or springy clamp being com—
posed of two branches, the one 4 rigid and the
the springy branch, the said means further’ be
ing such that they do not prevent the passage of
45 the releasing blade.
In order to. make the invention clearly under
stood and by way of examples of realization,
50
after the said pulling needle has begun its return I
movement towards the selvedge.
.
forms of execution are described below and
other 5 ?exible.
shown diagrammatically in the attached draw
'2 is the springy clamp of the conveying nee
dle (Fig. 5) in which is caught the end of the
mg.
1
.
,
'
These forms of execution consist in an applica
weft thread a unwinding from a ?xed bobbin
tion of the invention to pulling needles of the
kind described in the U. S. patent application of
and passing over a supporting point 3 integral
with the said conveying needle, which allows a
stretched part a1 of the thread a to be presented
the applicant Ser. No. 19,576 of May 3, 1935,
Needles, the holding member of which consists
to the pulling needle ‘which seizes it at'the _mo
65,
2,119,573
,
,
--
1
'
"
‘
~
ment'of exchange, in passing between the springy
'The thread, continuing, to slide between the
clamp' 2' and the supporting point 3.,
‘ branches 4 and 5, reaches the level of the notch’
1 is aimetal part forming, the base of the hold
6, and as the result of being raised on the edgeiof
‘7 ing member of the pulling needle, on the end of
wing'lll, enters the notch 6 and passes above the
?xed ‘by any appropriate means, for
point 6'" to take up the position a3—b3. At this
example by screwswhich, when there is a guard "moment the thread coming from the bobbin:
of the kind'shown 'at 20 (Fig. 10), pass through presses on the boss 14, thussincreasing the grip
and hold thersaidrguard by entering the thread
ping of the partrb3, which, in combination with ~ -:'
ed holes 9 provided in the thicker portion 87 of the, advantage which thenotch 6 affords of limit
V which it
'
10
a
the part ‘I, the said thicker portion being ?tted
»ing "the advance ,of the'thread between the,
, inione of the sides of the tube or of the L-shaped
branches 4 and 5, facilitates‘ the removal of‘ther :
body in cross section usually forming'the arm-pf;
thread outside the conveying clamp 2.
I the needle and in the guard, so that thispartbof
l
t *
The needles then stop, afterwards receding to; V
thetube or L-shaped body is held tightly between I Ywards‘ their respective selvedges, so, that the a
~ _, thread a coming from the bobbin and continuing 15;
This part 1 is prolonged, being L'-shaped in to be raised by the edge of wing l0,,passes above
I 175 the said part ‘I. and the base of the guard 28.
'
‘
' branch
cross-section,
of theone
clamp,’
wing, whilerthe
,4 "constituting
objectjof
the rigid
the ' the'point ?'egof 'thenotch, and is ?nally stretched 7' ,
vas shownat 114 '(Figs'. 6 and 7) , the ?nal point of
j'other wing ID will be described below...“ , ii
<~ gripping~being at “[74. The portiona‘1 of the said j'
I
20
.On this part-,1 is ?xed by screws I one at; - thread'c'oming from the bobbin, normally’ presses 20
,of the ?exible branch 5, theopposite ‘endv of which ,on the boss l3 of the springy'branchYS ‘and
is shaped in such a wayl'as to’ come into contact; eventually on its end 5', so' long as the tension
over a certain'distance, with the end'o‘f the rigid
branch 4, this ‘branch Shaving a‘ notch 6“close
tofits end on the‘side facing'theiwin‘gr Ill. .Further
the said :part 1 haszafslot 15' at the side to allow
I, ,of the passage'of the releasing blade l6' mounted ,
V on a'support I‘! situated outside theshedgnear to v '
the .selvedge; the object" of *this_‘ blade being‘ to'
7' 30'. separate the two branches land Sandthusto re-‘,
of the thread remains normal, that is to say'so- ‘
long as 'theT'unWinding of’ they thread fronirits
bobbin does not offer any abnormal resistance; ,7 25
' If during‘ the return of they needles over-tension
'
occurs, the portion a4 ofvthe thread presses more a ' '
upon the boss I3 and"e'ventually’on the‘end’S’,
which increases proportionally the gripping aw.
With'a view to ‘givin'gthe ‘rigid branch '4 the
30
lease the" end of the weft thread a vwhen l the - advantagesrof the ?exible branch, ais‘pringy blade ,
: pulling needle ‘moves‘outjof' the‘ shedr. : ‘I '
7 may be ?xed onthe inner face of the‘said' rigid‘
In: order to compelithe tthread"'to;en'ter“.the ‘ branch 4, so as to come'in contact with'thelinner ‘V 7
notch 6, the ends of‘v‘the‘branch'es are‘v arranged face of the springy branch‘.
'35
7
To increase the adherence of the thread gripped‘
In plan the end 5' of the flexible‘branch'l'r is
between the- inner surfaces'lof thebran'ches and
as follows:'—
'
'1
‘
'
-
”
‘
e
slightly raised vand straightened'f as shown in Fig. 7
'2) and has,‘ on the ‘side facing the‘wing' 10, a
thus to'enabler' the'said surfacesto offer ‘a greater"
resistance to slipping,’ these surfaces ‘may be‘,
formed with cavities ‘or notches or the 7 said
Projection‘ l I' cut in" the ‘shape ' of ‘ a, heck‘? 2,
directed (as shown in'FigL '4) 'to'w'ardsrrthe' rigid’ branches may be pierced, for example as‘ shewn 401
at l8 (Fig. 6) these means however having tobe
, H branch: 4, in sucha way that,"when pullingitakés.
place, the thread‘places‘its'elfieasily on the end-5’; ' ' selectedrin' such’ a- way as not to
' The end'ij4'“'of the“ ‘rigid branch‘, [is bevelled
across the whole of"its‘thicliness ‘as’ shown-fin
Fig.2?
.
>
,_
a,
~
.
passage of the'releasing'blade.
V
I
H
' '
"
‘
45'
for patent mentioned, above also, 'the exchange,
of the thread with‘ the’ conveying needle taking
place, in this case, wh'eri'the needles’recede to‘- p
extends *in'ithe'
cut obliquely as'shownfin'rl'l'ig.’ l. w ' '4 I
‘
ing needle of the'type described in the application
.,
V notched‘ at l0’ to'receivethe‘ end of the hookv‘l2
of the _-?exible' branch}; which7
‘
7 With regard to'Figs.>8 to _12; they Show, a: pull-1
The end of thawing] 0' also" is bevelled ‘and-ls"
plane
“"Finally
ofrrthe
thesaid
ends’
wing;
“and
" 5',_ _of "the_ branches
I’ Y e are‘
hinder the free
"
.
wards their respective selvedge;
"
‘
“
'
is decreased ‘50
0n the rigid branch I, the wing
in height at'a certain" distance from the end,-in
Invrorder to» ensure a: better gripping of the such; a' way'as'to' be_,}?ush 'withjthe level of the,
(thread, either at the 'in'om'entiof exchange‘?Fig.‘
55
'5) or at the‘m'oment of pulling (Fig.3); bosses-l3
springy branch” 5.1 ‘This fwing' lll?towarids- the
end, is done‘, away within such ‘a way as t'oias'sist
and > M, formed integral with or/ attached, are in the formation of a'w‘ide ‘lateral notch I0" in
T provided on each Tside'v of the notch '6, on the I which lodges loosely‘an' enlarged and’rightfang'le
outer facerofithe ?exible branch}? "I'he-_'th’re‘ad, turned up part L‘), which ends the side projection
on leaving’ the notehf?,‘ 'fromTthe gripping pdint b 7 [7| of?’the‘r enagsqmt obliquely ofitlie, flexible;
' betweenthe two branches’ 4fand75, bears slici branch" 5,-tl'1ispartl‘9 assuming approximately
to cessively on the one andthe' ‘Qwerty-he bosses the shape of a trapezium ~ (Fig; '11) . ‘
On ,the opposite vside of the ?exiblebrarlchj ,
; 'Inus arrangedfthe 'holding?iezribe'r functions
asj_folloWs:_-—
:2 It will be‘ seen
x in Fig;
f; ‘ " 5 that
V thezportionldfofr
‘f‘ ’
and near its raised‘ vend 5','the side notch Bis pre-I
vid'ediwhich‘isprolonged by a‘ slot eyelet-‘edge *'
of this 'notch ending in the foifiri__ of »a_ tooth I'2’f,
and ' the. point of which, directed, tothe rear, is slightly,
the? thread, stretched "between-the @cla’mp
1 the supporting; point 31 of the conveying needle, ‘ raised 1(,Fi'gfl0) , the'bos's I 3 being‘provided" onthe '
, approacheslthe pulling needle‘ as 'the'twp needles
continue to advancetheone towards’tl'ie other.’
outer iaeeiatthe‘endi'o'f the slotB'J of the‘flotch'?n.
7 : lit‘ is" then ‘presented in the‘ planejpl: ‘contact a of 1 ber‘,‘ thus'arrang'ed, of the-pulling needle, operé
the‘ ends" of the branches" Q *a?'nd'i, between which ~
rit'enitersj
"
"'
‘
r
'
f This portion dIIof‘thetlirea'dthen ‘s aésmider
the edge ‘0': the’wing-Hlfarriving ‘even 11y by
:' theith'ook :l'2f0r the flexibl'efbraneh: Slfandfalong'
irtliis'imeans'a't‘ the easement?“ “
-' *
ates as _follows:-—
,
: -'
r
l ,
.
_'
,The portion a2 of theuweft thread,';stretched
between the’ clamp "g and, lthegsu'pporting point; {IV
of the conveying needle,
needles (Fig. 8),;
_
apprpjasihes as. pullifelg
"
5
» It slides’- ;m 'tlie'bevélled'eiid a? eftlié'agia
' '
'
2,119,573
branch and then meets the sloping ‘side of the
trapezoidal part l9 of the springy branch 5
which compels it to pass above its raised end 5'
3
of said gripping means will be increased by the
resistance of the thread during the unwinding
operation.
cut obliquely, so as to permit the passage of the
2. In looms of the type having a shed and a
Weft thread, and arrives at the moment at which
the needles stop in the position shown at a3,
pair of ‘reciprocating needles moving toward and
above the branch 5 (Fig. 8).
'
away from each other for laying the pick in the
shed, a pulling mechanism carried by one of
When the needles return in the direction of
said needles and a conveyor mechanism carried
their respective selvedge, the portion of the
by said other needle, said pulling mechanism
thread at a3 passes under the raised tooth l2’
and is lodged at the bottom of the slot 6°.
As the needles continue to recede, the end of
the thread slides out of the clamp 2 of the con
veying needle and the thread a, coming from the
15 bobbin, passes’ over the boss 13 and also-owing
to the sloping side of the trapezoidal part l9—
over the raised end 5’.
As the result of the withdrawal of the pulling
needle and of the supporting point 3, the de?nite
point of gripping is to be found at 54 (Figs. 9
and 10) , the portion a4 of the weft thread a ex~
ercising a pressure on the boss I3 and the end 5'.
comprising a rigid member and. a resilient mem_ 10
ber for gripping the thread therebetween, the
gripping end of said ?exible member for at least
a portion of said length being in resilient contact
with said ‘rigid member, gripping means on one
of said ?exible members for gripping and retain 15
ing the thread between said members during the
reciprocating movement and cooperating means
carried by the'gripping ends of said two members
for introducing the thread into said gripping
means during the approaching movement of the
two needles, the gripping end of said ?exible
more upon the boss l3 and eventually on the end
member being so constructed and arranged with
respect to said rigid member and to said con
veyor mechanism that the thread will ride on
the exterior surface of said ?exible member and 25
exert pressure thereon during the receding move
5' of the springy branch, which proportionately
increases the gripping at the point 224.
If necessary, to prevent the ?oating warp
ment of said needles whereby the gripping force
of said gripping means will be increased by the
resistance of the thread during the unwinding
If, until the arrival of the drawing needle out
side the selvedge, any over-tension occurs, the
25 portion a4 of the thread presses proportionately
30 threads from entering, on the return of the con
veying needle, under the point I2’, a guard of
the known kind may be used, as shown at 20
operation.
'
3. In looms of the type having a shed and a
pair of reciprocating needles moving toward and
With the same object it would be possible to
give the branches themselves of the pulling
needles of the types above described, the shapes
of head which are the subject of the U. S. patents
away from each other for laying the pick in the
shed, a pulling mechanism carried by one of said
needles and a conveyor mechanism carried by 35
said other needle, said pulling mechanism com
prising a rigid member and a resilient member for
of the applicant, No. 2,053,657 granted Septem
gripping the thread therebetween, the gripping
(Fig.
10).
>
_
-
ber 8, 1936 and No. 2,059,726, granted November end of said ?exible member being in resilient
, contact with said rigid member at least for a 40
4:0 3, 1936.
It is to be understood that, without departing portion of its length, gripping means carried by
said ?exible member for gripping and retaining
?rom the spirit of the invention, alterations, im
provements or additions may be made and in the
same way the employment of equivalent means.
45 may be envisaged; for example, in the ?rst form
of execution, the wing l0 could be eliminated
and, in this event, the points of the notch 6
would be lowered on the side on the rigid branch
or in cavities, so that the thread could enter the
said notch; or an equivalent for the wing l0 could
be supported by the elastic branch itself.
I claim:—
1. In looms of the type having a shed and a
pair of reciprocating needles moving toward and
55 away from each other for laying the pick in
the shed, a pulling mechanism carried by one of
said needles and a conveyor mechanism carried
by said other needle, said pulling mechanism
comprising a rigid member and a resilient mem
60 ber for gripping the thread therebetween, the
gripping end of said ?exible member being in
resilient contact with said rigid member at least
for a portion of its length, gripping means on one
of said members for gripping and retaining the
65 thread between said members and cooperating
means carried by the gripping ends of said two
members for introducing the thread into said
gripping means during the reciprocation of the
two needles, the gripping end of said ?exible
70 member being so constructed and arranged with
respect to said rigid member and to said con
veyor mechanism that the thread will ride on the
exterior surface of said ?exible member and ex
ert pressure thereon during the receding move
75 ment of said needle whereby the gripping force
the thread between said two members and co
operating means carried by the gripping ends of
said two members for introducing the thread into 45
said gripping means during the receding move
ment of the two needles, the gripping end of
said ?exible member being so constructed and
arranged with respect to said rigid member and
to said conveyor mechanism that the thread will 50
ride on the exterior surface of said ?exible mem
ber and exert pressure thereon during the reced
ing movement whereby the gripping force of said
gripping means Will be'increased by the resist
ance of the thread during the unwinding oper 55
ation.
4. In looms of the type having a shed and a
pair of reciprocating needles moving toward and
away from each other for laying the pick in the
shed, a pulling 'mechanism carried by one of 60
said needles and a conveyor mechanism carried
by said other needle, said pulling mechanism
comprising a rigid member having an L-shaped
cross section forming a wing and a ?exible mem
ber, said ?exible member for at least a portion 65
of its length being in resilient contact with said
rigid member and notched to receive and retain
the thread between said members, the gripping
end of said ?exible member being slightly raised
and straightened and provided with a hook fac
70
ing said rigid member, and the gripping end of
said rigid member and the adjacent end of said
wing being bevelled and the said wing being
notched to accommodate the hook of said ?exi
ble member whereby the thread will be intro
75
4
"2,118, 673
V
7
1duced' into; and retained in said notch'during the ' member ‘and notchedfand provided with a» hook '
approaching 'movement‘of the needle, said vpull
ing mechanism being 'sovarranged‘with respect
toovsaid‘ conveyorgmechanism ‘that thethread will
5 ' "ridefon the exterior surface ofjsaid ?exible mem- ‘
?ber and exert pressure, thereon’ during therecedé'
ing' 'movement "of ; said ? needles and, said ?exible
Inember being embossed" on} each side' ofv said
'notch whereby the gripping force of said gripping
10 means will'beincreased'by the resistance of the
' rfthread during'the unwinding Operation.
5; In looms of the 't'ype'having a shed and a
pair of reciprocating needles moving toward ‘and
facing’away from the rgripping end tojreceivejthe 7‘
thread ‘during the receding movement offsaid
needles, the extremity of the gripping end of said
?exible jmember being? bent outward and pro?
videdwith a lateral trapezoidalVprojection-iacing
said rigid member and said rigidmember being}
notched‘ to‘ receive said projection; the’ endm'of
saidrrri'gid memberf facing the conveyor mecha
nism being bevelled whereby the thread will-slide
10
over the exterior surface of said ?exible member J -
during the approachingv movementand- will be
received in said notch during the recedingrmovee V ‘
' away from each 'otherr'forllaying the pick in the ment, and ride overthe ‘exterior; surfaceof-‘said
.‘ she'd,v a pulling mechanism carried by one of said ' ?exible member? and'exertpressu're ontsaid pro= 15
needles and a conve'yor'gmechanism carried'by
said otherpne'edle; said pulling mechanism com-'
iection whereby the gripping force of ‘said grip
ping means will be increased-by the resistance
prising a. rigid'member andfa resilient member, of the thread duringgtheunwinding operatioinj' ' I
>said~resilient member; being-'inrresilient contact.
24) for at least a portion of its length with said ‘rigid’
> r
RAYMOND'IDEWAs-H
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