6081] The invention relates to a device for removing weft thread. The invention also relates to
a weaving machine naving s ~ c ah d evice.
6 [0602] it is known tRat, when a weft thread is inseried into the shed from an insertion side to an
opposite side, various irregularities can o~curs,u ch as a broken wen thread or a weft thread
which does not reach the opposite side of the shed.
[0803] From NNL 86021 91 A, NL 8802826 A, EP 31 8804 A2 and EP 534541 AS, It is known to
remove wefk thread from a shed. According Is one embodiment, the shed is firstly opened so
18 that the wefi thread KO be removed is free. Next a foliowing weft thread, which Is connscied to
the wefi thread to be removed: is inserted into the shed and both wefi threads are together removed
on the opposite side of the shed. To this end, both pneumatic elements and mechanical
elements can be used for the removal of tile two weft threads, it is known that the forw which
pneumatic elements can apply lo wefi threads is sometimes too small to remove w f t threads
15 effectiveiy. Such pneumatic elements are hence especially suitable far removing weft tRreads
which lie s~sficaiently loose, are nowhere caught in the shed or are nowhere jammed. It is also
known Ihat the speed at which mechanical elements can remove weft threads is relatively I ~ M ,
and that tie force at which mechanical elements can remove weft Ihreada can be of such magnitude
that the force is suTficient to iraar the weft threads to be removed.
20 [CBBW] The object of ihe invention is a device for removing bvelt thread, which device all8ws weft
thread to be removed in a reliable and rapid manner.
[0$05] This object is solihed by a device Raving the ~haraderisticso f Glaim 4 and a weaving
machine having the characteristics d Claim 5. Preferred embodiments are defined in the dependent
claims.
25 [0066] Accordling to the invention, the device comprises a first unit for generating a pneumatic
tensile force on a weft thread and a second unit for generating a mechanical tensile force on a
weft thread, wherein in the movement direction of the weft thread ihe first unit is arranged
downstream 05 the second unit. so that weit 'rhread which is guided ihrough the device by the air
cum-rent generated lay the first lrrpit can be clamped by the sscand unit, and wherein the device
30 comprises a housing having a flrslt bore, which in use extends in the movement direction of the
welt thresd, and a second bore, which is disposed transversely to the first bore, wherein the
second unit is mounted in the area af the second bore. Within the contexi of the application, by
a "'pneumatic tensile .Force" is meant a tensile force generated Ry an air current an a weff thread,
and by a "mechanical tensile force" is meant a tensile force generated by mechanical means,
such as clamping elements, on a weft thread.
5 [PO073 According io one embodiment, the second unit comprises clamping elements, a 'first
actuator for moving the clamping elements towards each other, andlor a second actuator For
rotating the clampirig elements.
[E8888] According to one embodiment, the device comprises a Rousing Raving a first bore for the
guidance of a well thread, wherein the diameter of the Wmt bore is smaller than the diameter of
10 the clamping elements, so that we% thread which is guided through the device can be clamped
between the clamping elements d the secmd unit.
TO8091 The invention offers li?e advantage that the .first unit for generating an air current through
the device according to the invention is arranged, in the movement direction of tha weft thread,
dawnstrsam of the second unit, so that a suction effect is generated dowristream of the me-
15 chanical effect, more particularly in the area of the moveable towards each other and rotatable,
drivable clamping elements of the second unit. It is hence noi anly possible to remove dust in a
favourable manner, but it is also possibOe to remove the mechanically removed podion of weft
thread pnzrrmaticaily from the device according to the invention in a sirnpie and rapid manner.
[OOiB] The Invention also relates to a weaving machine which comprises a device: according to
2 the invention. in this case the weaving machine comprises a reed and the device is msunled, in
Zhe mowensent direction af the weft thread, past the reed. According b a preferred embodiment,
the weaving machine comprises a weft detector which is mounted between the reed and the
device according to the inventionp wherein a first actuator, which moves a first clamping element
to a second clamping element, moves the Wmt clamping element in a diiedion towards the read,
2 so that weft thread is guided to a weft datec~or.
[80"1] Imbadirnents sf the invention are described in detail below, based on various schematic
figures, in which:
Figure 9 represents a portion of a weaving machine having a device according to the invention;
38 Figure 2 represents a perspective view of the device according to the invention;
Figure 3 represents the device of Figure 2 in the dismantled state;
Figure 4 represents a vertical cross section in the movement direction of the weft thread cf
the device according to the invention;
Figure 5 represents a veriicai cross section transverseiy to the movement direction af tl~e
5 weft thread of the device according to the inveation;
Figure 6 represents a horizoniai cross sedion d the d~vicsa ccording to the invention;
Figure 7 represents a variant af Figure 1;
Figure 8 represents a variant of Figure 7;
Figure 9 represents a variant of Figure 8,
40 [8042j Throughout itha figures, the same or simiiar elements are indicated by the same reference
numerals.
[OCB13] In Figure 11, a portion of a weaving machine is schematically shown in the area of the
apposite side or' the shed (not shown), A device! 1 according to the invention, which is fastenau
via a fastening system 2 to a crossbeam 3 of the weaving machine, is herein shown. A portion
45 of a sley 4, on which a read 5 and a weff deiirector 6 are mrjunted, is %t~flhsehio wn.
[8014.%VV] i~ent he wefk detector 6 dete~tsa n incomeciIy inserted wefl thread, the weaving process
is Entarmpkd. A~cordingto one embadiment, a following inserted w& thread 10, which is
connected to the incorrectly inserted weft thread 11, is next brought in a known manner through
the shed to the device 1 according to the invention, for example according to a methad as
20 known from NL 86 02191 A. it is here also known, after the detection of an incorrectly inserted
weff thread, to release a limited qilantiiy of weft thread in the area of a thread supply and not KO
cut off the incorrectly inserted weft thread "i from the thread supply. Both weft Ihreads 10, 11
are here brought to the device 5 by the blowing efreci on the wen threads which is obta~nedb y
the sipccessiva activation of main blowem (not shown) and auxiliary blawers (not shown). The
25 device I Is here designed lo remove these weft threads 10, 1 'i in an efficient manner from the
shed and from tne device 1.
[(I9453 in order io allow the! foIIowing inseried weft thread 10 to be b i ~ ~ gtIo'g~etth~er with the
Incorrectly insedeal weft thread 11, via the Inlet 7 of the device 'i into the device 1, the $ley 4 is
brought into a position wherein tRa guide channel 8 of the reed 5 is arranged almost in the extension
of ihe inlei 7, as shown in Figure 1. When bdh weft threads 10, 11, for example in a
loop shape, reach the device I according to the invention, these weft threads 10, 1 1 are detected
by ths wefi detector 6. These weff threads 10: 4 1 are hereupon taken up into the device 1 by
5 the sr~ctiorei ffed of the device 1. Next, the follobving inserted weft thread 10 is cut off from the
thread suppiy, while the device I continues to exert a suction efied. in arder to enable the following
inseded wefi thread 10 ta be cut o'ff by weft scissors (nd shawm) arranged near the fell
line, the sky 4 is moved with the reed 5 up to the fell line, whereby the weft threads which extend
PI, the device 1 are brought with certainby into the we'R dstwtor 6, so that they are with cei-
70 tainty deteded. Should both weft thrads 10, 14 be removed fmrn tile, shed by the device I, the
weft detector 6 in this case no ionger detects any wefi thread: so that the weft detector 6 sends
a signal to the conirol unit 16 of the weaving.rnachine to indicate that the Wo weft thwads hsve
been successfully removed. ShouDd the weR detector 6 during a sci time further detect weft
thread, a switch is made ta a pneumatic and mechanical removal of weft 'thread, as will be fur-
5 ther 6escribed in detail.
[EIOl6] The device 1 according 'to the! invention is shown in detail in Figures 1 to 6. The device 1
according to the invention comprises a first unit 9 fur generating an air current, a first actuator
12 for generating a to-and-fro motion, and a second xtiator 13 far genera.ting a rotary mdion.
The firsi unit 9 is provided via a compressed-air line 14 with compressed air corning 'from a
20 compressed-air source (not shawvn), for example a ~ompressed-air source at 1.5 bar. In order to
continuously remove dust, it is preferred to continuously generate an air current through the
device 1 by means of the first unit 9. The continuous air curenl' is also advanrageous for keeping
weft threads taken up in the dsvice 4 sketched in il?e area d the wcfi deted~6r, for sxample
when the reed 5 moves up to the fell line; The first actuator 12 is provided with compressed
25 air, fur example via a valve system 15, for example a double-acting waive system, which, optionally,
can move the fint actuator 12 in one or the other diieclion. The valve sysiem 15 is pi@
vided via a compressed-air line 17 with compressed air corning 'From a compressed-air source
(not shown), for example a compressed-air source at 6 bar. The second aduatsr 13 is, for example,
a corntoilable motor. The second acruator 13 and ihe valve system 15 are contro9lad by
3Q means d the control unit 46 via electrical signals.
[00*17j The device I according to the invention comprises a housing 28 having a first barn 21,
which in rase extends in the movement direction A d the weR thread, and a second bore 22,
whish is arranged transversely to the first bore 21. The Rousing 26 is he;e designed as a closed
block whiah is provided with bores 21 and 22. The movemefit direction A of the weft thread is
35 here also the dire~tionfr om the iniet 7 d the hausing 20 to Il-ra outlet 49 of the?:g uide pipe 28.
The movement direciion A of the weft thread is here also the direction from the in~erti~sidne to
the opposite side cf the shed. M cne end d ,he first bore 24, which also forms the inlet 7, is
mounted a guide eye 23. The first ligit 9 for generating an air current comprises a blowding device
24, whicl-s is mounted al the: end 50 of .the fiwt bore 21 opposite the iniel 7. The blowing
device 24 is designed, for example, as a "venttirim.T he blowing device 24 is canneded via an
5 opening 25 in th6 housing 20 to ihe compressed-air line 14, as shown in Figure I , By supplying
compress& air via fie opening 25, an air current is generated through the housing 20 in the
movement direction A oi the weft thread. The blowing device 24 Rere generates an air ct.ir;ent
based oan 'rhe "Coanda" effect, which is commonly known from the flow theory of compressed
air. This air clsrrenl also gives rbe to a auction effect in the area dthe inlet 7.
10 [$0*l8] According to one embodiment the blowing device 24 comprises a guide pipe 28, which
is provided with ai? external screw thread 27 which is screwed inIo an iF-rternaE scre& thread 29
~r'ft he housing 26, which is mounted in a bore 38 in the housing 20. The bore 30 is arranged in
the extension of the first bore 21. In addition, the guide pipe 28 screwed in the housing 28 i~
fastenad via a nut 31 ifdith TESped to .the hoissing 20, The blowing device 24 also camphes a
$5 prohiing 32, which is rnounted ciose Po the -first bore 21 and in the area of the inlet 28 of the
guide pipe 28 for the generation of an air ~urrenbt ased on The "Coanda" effed: which profiling
32, to this end, also cooperates with the bore 30 in ti18 housing 20. This allotvs an air current to
be guided in the mowernerrt direction W of the weft thread along a weft Phread extending through
the housing 20, and thus a pneumatic tensile force to be exerted on this wefi thread. As can be
20 seen, the internal shapa of the guide pipe 28 is divergent in design in order to improve the iansile
.fcrce exerted on wzfi threads by the air current. The force exeried on the weft threads by a
Erst unit 9, and also the suc'iion effect, more pariiculariy the suction 'force exerieoi on the wefi
threads from the inlet 7 by the fist unit 9, @an be set by adapting the pressure of the mmpressed-
air ,source connected to Yha compressed-air iine I4 andjor by adapting the disbnce
25 fmm the prcp'fiiing 32 'ro the bore 30.
[60191 The device 1 according Yo the invention .hrthar comprises a second unit 19 -for exeiiing a
mechanical tensile force.on a weft tl.rr@aeiT. ine second unit 19 is mounted in the arra of a as@-
end bore 22, which ia arranged transversely to the first bore 21.7~8se eond unit 19 comprises,
inter alia, a Rrst clamping element 33, a second clamping element 37, a fiat actuator 12 and e
3 second aduator 13. In the area of 'rhe second bcre 22 is ro'ratabiy mokisted a f i ~ Ycl amping element
33, which can move to and 'fro along the second bore 22 in a movement diiection B. To
this end, the first clamping eiement 33 is mounted in Zhs shown embodiment ail the RWf actuator
12, which comprises a compressed-air cylinder 38. in the area d this second bore 22 is Tota'rabiy
mointed a seeond clamping element 37, which is driven via the second actuaior 13. The
35 second actuator 43 comprises a motor 34. This semnd clamping elemen'r 37 b fixedly 'fastened
on the shaft 35 of the motor 34. Bebean the mator 34 and the aecand clamping element 37 is
mounted a supporting ring 38. Tie motor 34 is commanded by the control unit 16 of iha weaving
machine.
[0020] The Rrsl clamping elernern 33 Is fastened via a bearing 39 and a fastening elernent 40,
for example a screw, onto the plunger 41 of the compressed-air cylinder 38. The compressed-
5 air cylinder 38 is. far example, double-acting and is moved to ana fro by rhe controi unit 16 of
the weawrng rnacnine, via the valve system 15 shown in Figure 1. by feeding of compressed air
via either the opening 42 or the opening 43, According to a variant embodiment, the compressed-
air cylinder 38 can be single-acting, wherein the plunger 41 is commanded in one direction
with compressed air and is reiumed in the other direction by a spring. When the Rmt
18 clamping element 33 is pressed with the aid of the carnpressd-air cylinder 38 against the second
clamping element 37, this secana clamping element 37 can be driwn together with the fiwt
clamping element 33 by the mdor 34.
[Q821] The first actuator 52, viewed in a direction towads the guide channel 8 af the reed 5, is
the foremost aduaior, meaning that the ,first actuaPsr 12 fcr the housing 20 is arranged as
76 shown in Figure 1. As a result of ihis arrangement, the first clamping element 33 moves in a
direction towards the reed 5 and iro the second clamping element 37. This aiTeis the advantage
thaP weft threads which extend through the device 1 according to the invention are pressed into
the weft dekcior 6: while -the clamping elements 33 and 37 move towards each other, more
particularly while the first ciarnping element 33 of the first aduaterr 12 moves rearward.
20 [8022] According to the invention, the first clamping element 33 and the second clamping eiernent
37 are dimensioned such that a weft thread 10 or 11 guided through the Rwi bore 21 d
the housing 20 can at any morneni be damped with certainty beheen the clamping elements
33, 37. To .this end, according la one embodiment: the diameter of the first bore 24, and thus
also of the guide eye 23, is smaller than the diameter of ihe clamping elements 33 and 37 in the
25 area of the place where the weft threads are clamped beheen the clamping elements 33, 37. il
is herein ensured that a wefi thread 10 or 'l1 can be clamped between the clamping elements
33 and 37 when the clamping elarnenls 33 and 37 rnclve towards each other in the rnovarnent
direction B. The first clamping elernemt 33 hereupon moves in %ham ovement direction B, while
the second clamping element 37 is only rota821 and does not move In the movement dirmtion
30 B.
[QB%J] According to the invention. the clamping elements 33 and 37 are arranged, in the
rnavemeni direction A d he weR ihwad, upstream d the first unit 9 for generating an air cur"
rent. This means that the clamping elements 33, 37 are arranged between the inlet 7' sf the
housing 20 and the inlet 26 of the guide pipe 28. Tiis ofiers the advaniags that dust present in
the housing 20, more particularly dust present in the area of ti;@ first bore 21 and the second
bare 22, is removed with certainty 'from the housing 20, Such dust is also named weaving dust
2nd is formed, inter alia, through friction of weft threads with compressed a io~r with other elements.
By the arrangement of the firat unit 8, in the movement direction A d ihe weit thread,
5 dovdnstrearn of the clamping elements 33 and 37, vsefi tinread, which, by the air current, moves
through the d e v i ~I, i s also forced almost centrally with resped to the first bore 21, sinca the
first unit 9 exerts a tensile force on the weft thread. It is also hereby ensured that a weft thread
10 or 11 can be clamped \~nll.hc ertainty &Ween the clamping elements 33 and 37 when the
clamping elements 33 and 37 move towards each ather.
I O I00241 According to an exemplary embodiment, the device 1 according 50 the invention cars be
applied as foEIutu7s.W hen an incorrectly inserted ~ e fthire ad 5 Ii s detected, .for example by the
wefi detector 6, the weaving process is interrupted. Next, the guide channel 8 OF the reed 5 is
brought by the sley 4 into the extension 3f the inlet 7, and an incorrectly inserted weft thread I I
is brought, together. with a following inserted tveftthread 90, via We inlet 7 into the device 1 acf6
cording to the inventtan. By the arrangement of the weft detector 6, the weft detector 6 detects
w8fi thread. Next, the incorrectly inserted weft thread 11 is cut off fmm the thread supply.
Should the weti detector 6, during a set time, no longer detect any weft thread, this is interpreted
by the control unit I6 as all we'A thread has keen removed. Should the weft detector 6, during
a set time, still detect weft thread, this is interpreted by the control unit 16 as weft thread
20 which is stuck or jamme-d somewhere and cannot be removed by the air current in .the device 1.
In this case, the Firsl actuator 42 is commanded so that the clamping elements 33, 37 move towards
eacn other. Next, the second actuator j3 is commanded so that the second clamping
dement 37 rotates and that also the .first: clarnping element 33 rotates together with the second
clamping element 37. Weft thread, which has been clamped between both ciamping elements
25 33, 37: is hereupon drawn via the iialet 7 into the device 4. Afler a short time, for example a few
rnilliseccmds, the second acterator 'I3 is no longer commanded, so that the wefi threads are not
tom or do not break. According to one variant, the ~lampinge lements 33,3T can be n-s'ralad,f or
example, over a iirriited angle, for example a limited angEe such as a half turn, one full turn or a
couple of -iurns. By the rotation over a limited angle, and thus the movement over a limited dis-
39 tance, it is avoided that weft thread is tarn or breaks. When dravdn over a iimtled distance, weft
threads can deform with sufficient eias'ricily and the risk d weR threads being tors7 or breaking is
limited. Next, the first actuator 12 is commanded to move the clamping elements 33 and 37
apart. The portion d weft thread which is hereupon released is removed from the dewice 1 by
the: air current. This is successively repeated until the wdeR detecior 8 no iongar detects any weft
35 thread.
[0025] This mechanical pillling on the weft thread makes it possible to exert a relatively high
tensile .force, while due to the short-term mechanical pulling on the weft thread or the ratation of
the clamping elements 33 and 37 over a limited angle it is avoided that the weft thread is tom or
breaks. When the weft thread is no longer stuck or caught, the wet7 thread can also be removed
6 by the air currant while it is not clamped bebeen the clamping elements 33 and 37, so that this
weft thread can then be removed relatively quic~lyT. he device Ia ccording to the inverrtion tllus
makes it possible both to pull with high force on the weft thread by means of the clamping el*
rnents 33, 37 and ta mpidiy remove weft thread by means of the air cument.
[OTPZB] As the second actuator, a DC motorj a step motor? or any type of controiIsble mator can
$0 be applied. According a variant embodiment, as ihe second actuator 13 s motor having an
settable drive torque carp be applied, for example a torque-controlled DC motor, which allows
the drive torque of the motor to be adapted to the characterislics of the weft threads, so that it is
possible to drive tRe motor for a longer time and over a larger angle without risk of weft threads
being torn or breaking.
15 [R)02a Although in the shown embodiment the first actuator 12 is designed as a pneurna'ric cylinder,
according to one variant it is also possibie to apply as first aduztor another type d aduator,
f ~erxa mpla a linear actuator andlor an electric actuator.
[0028] According to a preferred embodiment, an air current continuously flows via the cornpressed-
air line j4 throevgh tha Rwt unit 9, and thus also through the device 1. This offew ths
20 advantage that dust is removed ~anfinuousiy from the device 1 and no dust accumulation can
take piace. This also offew the advaniage that weft thread which is present in the device 1 is
removed continuousiy from the device j. According to one embodiment, an air current only
flows continuously through the device I if weft threads need to be removed. Should no well
threads need to be removed, it is possible at specific moments to let an air current flow through
25 tRe devies 1 in order to clean the device 1 of dust. According to another possibility, an air current
can flow @ontinuo~?jtlhym ugh the device 1 at Eow flaw rate, and an air current can flow
through the device 1 at higher flow rate if wafi threads need to be removed. To this endi suitable
valve devices a n be prwufided in the area of the compressed-air line 14, for example valve devices
vvhich are controlled by pulsation.
30 [OQ20J In Figure 7 is shown a variant wherein [he devica 1 according ta Ihe inwentioa is fastened
to the weaving machine in a different way. in [his case [Rs device 1 is fastened via a fastening
system 2 to a crossbeam 3 of the weaving machine.
[6030] In Figures 8 and 9, a variant of: respectively, -Figures I and T is shown, wherein the device
1 according to the invention cooperates witR a stretching device 47 as known from WO
2093117564 M, In this case the stretching device 4T facilitaks the gtiidance of both weft
threads 10 and I I to the device I according to the ifiven'rion. Be~teenth e wefi detector 6 and
5 the stretching device 47, a hook 51 is mounted on the aley 4. Besides, the second weft detector
18, in cooperatiofl with the weft detector 6 arranged next lo the reed 5, allows it to determine
with certainty when the weft threads 10, 11 have been removed. The stretching device 47 can
hereby also exert an exiia tensile farce on fne wefi threads 50, 4 1 to be removed. The stretching
device 47 is hereby fastened with a support 48 to the housing 20 of the device 4 according
58 to the invention.
[%PO311 It is clear that flat andlor smooth ciarnping elemenls 33, 37 do not necessarily have to be
provided. Amording to one variant, clamping elerneats can aiso be provided witin a surface
which can exert a iarge friction krce on wefi threads.
[0832] The fastening system 2 is provided with elements which allow he device 1 according to
45 the i~ventionio be arranged in a specific position with respect to the reed 5 or with respect to
the stretching device 47. To this end, the fastening system 2, as indicated in Figure 8, can be
provided with slots 44, 45: 46 for sefring both the device 1 according to the invention and the
stretching device 49 in a desired position with resped ,to fie crossbeam 3 andor the reeu 5.
I00331 According tc one variant (not shown), the devica 1 amording to the invention can also
20 be arranged on the insertion side of the shed in order there to remove weft thread there, for example
in a way similar to the metnod described in EP 309 013 Al. An extra blow nozzle can
Rere be provided in order to blow wfI thread in the area d the insertion side into a de\~ice1
according to the invention, inore particularly via the inlet 7 in the device I.
[O%P34W] ithin the context of the application, 'first'; and "semnd" are used merely to be able to
25 ddiffereniiate between the Rrst unit 9 and the second unit 59, kkweer~th e first clamping element
33 and 'rhe second clamping element 37, and between tine .first actuator 12 and the second aGtuatsr
13. The first unit 9 can also be named the pneumatic unit, while the second unit 19 can
be named the mechanical unit,

we claim
1. Device for removing a weft thread, wherein the device (1) comprises a first unit (9) for
generating a pneumatic 'tensile force on a weft thread (10, 11) and a seco~du nit (19) for
generating a mechanical tensile fopce on a weft thread (10, 11) wherein in the rnovement
direction (A) of the weft thread the fist unit (9) is arranged downstream of the second
unit (19), sa that weft thread (10, Sl) which is guided through the aevice (1) by the
air current generated by rhe fiwt unit (9) can be ciarnped by the second unit (191, characterized
in that the device (1) comprises a housing (20) having a first bore (211, which in
use extends in tithe movement dirsdion (A) d the weft thread, snd a second bore (221,
which is disposed transversely lo the first bare (21), wherein ihe second unit (19) is
mounted in ihe area of the second bore (22).
2. Devirie;e according to Claim 1, characterized in that the second unit (49) comprises @lamping
elements 433, 37) and a .first actuator (12) for moving the clamping elamenb (33, 37)
tobvards each other aiong ?he second bore (ME.
3. Device a@cording? a Claim 2, characterized in that the second unit (19) comprises a second
actuator (43) for rotating lhe clamping elements (33, 37).
4. Device according to Claim 2 or 3, characterized in that the diameter of the Wrst bore (21)
is smaller than the diameter af the clamping elements (33, 37) so that weft thread (18,
11) which is guided through the device (1) can be clamped betwen the clamping eiernents
(33, 37) of the second unit (19).
5. Weaving machine, characterized in that the weaving machine cornpdses a device (I)
amording .to any one of elaims 1 to 4.
6, Weaving machine acc~rdingto Claim 5, charactsized in that the weaving machine cornpises
a reed @), and in inat ti78 device (T) is mounted, in he movement direction /A) d
the wen thread, past the reed 15).
7. Weaving machine according Yo Claim 5 or 6, characterized in That the weaving rnacRine
comprises a weft detector (6) which is mounted bemeen .the reed (5) and the device (I),
and in that a fiwt actuator (12): which moves a first clamping element (33) to a second
clamping element (371, moves the first clamping element (33) in a direction towards the reed (5)so that weft thread (10,110 is guided to a weft detector9(6).