EP3066243B1 - Device for removing weft thread - Google Patents
Device for removing weft thread Download PDFInfo
- Publication number
- EP3066243B1 EP3066243B1 EP14786523.2A EP14786523A EP3066243B1 EP 3066243 B1 EP3066243 B1 EP 3066243B1 EP 14786523 A EP14786523 A EP 14786523A EP 3066243 B1 EP3066243 B1 EP 3066243B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weft thread
- weft
- unit
- bore
- actuator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009941 weaving Methods 0.000 claims description 22
- 235000014676 Phragmites communis Nutrition 0.000 claims description 18
- 239000000428 dust Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 238000007664 blowing Methods 0.000 description 7
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
- D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
- D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
- D03D51/085—Extraction of defective weft
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
- D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
- D03D47/3066—Control or handling of the weft at or after arrival
- D03D47/3086—Weft removal
Definitions
- the invention relates to a device for removing weft thread.
- the invention also relates to a weaving machine having such a device.
- Such pneumatic elements are hence especially suitable for removing weft threads which lie sufficiently loose, are nowhere caught in the shed or are nowhere jammed. It is also known that the speed at which mechanical elements can remove weft threads is relatively low, and that the force at which mechanical elements can remove weft threads can be of such magnitude that the force is sufficient to tear the weft threads to be removed.
- the object of the invention is a device for removing weft thread, which device allows weft thread to be removed in a reliable and rapid manner.
- 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 the first unit is arranged downstream of the second unit, so that weft thread which is guided through the device by the air current generated by the first unit can be clamped by the second unit, and wherein the device comprises a housing having a first bore, which in use extends in the movement direction of the weft thread, and a second bore, which is disposed transversely to the first bore, wherein the second unit is mounted in the area of the second bore.
- a "pneumatic tensile force” is meant a tensile force generated by an air current on a weft thread
- a “mechanical tensile force” is meant a tensile force generated by mechanical means, such as clamping elements, on a weft thread.
- the second unit comprises clamping elements, a first actuator for moving the clamping elements towards each other, and/or a second actuator for rotating the clamping elements.
- the device comprises a housing having a first bore for the guidance of a weft thread, wherein the diameter of the first bore is smaller than the diameter of the clamping elements, so that weft thread which is guided through the device can be clamped between the clamping elements of the second unit.
- the invention offers the advantage that the first unit for generating an air current through the device according to the invention is arranged, in the movement direction of the weft thread, downstream of the second unit, so that a suction effect is generated downstream of the mechanical effect, more particularly in the area of the moveable towards each other and rotatable, drivable clamping elements of the second unit. It is hence not only possible to remove dust in a favourable manner, but it is also possible to remove the mechanically removed portion of weft thread pneumatically from the device according to the invention in a simple and rapid manner.
- the invention also relates to a weaving machine which comprises a device according to the invention.
- the weaving machine comprises a reed and the device is mounted, in the movement direction of the weft thread, past the reed.
- the weaving machine comprises a weft detector which is mounted between the reed and the device according to the invention, wherein a first actuator, which moves a first clamping element to a second clamping element, moves the first clamping element in a direction towards the reed, so that weft thread is guided to a weft detector.
- FIG. 1 a portion of a weaving machine is schematically shown in the area of the opposite side of the shed (not shown).
- a device 1 according to the invention which is fastened via a fastening system 2 to a crossbeam 3 of the weaving machine, is herein shown.
- a following inserted weft 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 method as known from NL 86 02191 A . It is here also known, after the detection of an incorrectly inserted weft thread, to release a limited quantity of weft thread in the area of a thread supply and not to cut off the incorrectly inserted weft thread 11 from the thread supply.
- Both weft threads 10, 11 are here brought to the device 1 by the blowing effect on the weft threads which is obtained by the successive activation of main blowers (not shown) and auxiliary blowers (not shown).
- the device 1 is here designed to remove these weft threads 10, 11 in an efficient manner from the shed and from the device 1.
- weft detector 6 In order to enable the following inserted weft thread 10 to be cut off by weft scissors (not shown) arranged near the fell line, the sley 4 is moved with the reed 5 up to the fell line, whereby the weft threads which extend to the device 1 are brought with certainty into the weft detector 6, so that they are with certainty detected. Should both weft threads 10, 11 be removed from the shed by the device 1, the weft detector 6 in this case no longer detects any weft thread, so that the weft detector 6 sends a signal to the control unit 16 of the weaving machine to indicate that the two weft threads have been successfully removed. Should the weft detector 6 during a set time further detect weft thread, a switch is made to a pneumatic and mechanical removal of weft thread, as will be further described in detail.
- 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 for generating an air current, a first actuator 12 for generating a to-and-fro motion, and a second actuator 13 for generating a rotary motion.
- the first unit 9 is provided via a compressed-air line 14 with compressed air coming from a compressed-air source (not shown), for example a compressed-air source at 1.5 bar.
- a compressed-air source not shown
- the continuous air current is also advantageous for keeping weft threads taken up in the device 1 stretched in the area of the weft detector 6, for example when the reed 5 moves up to the fell line.
- the first actuator 12 is provided with compressed air, for example via a valve system 15, for example a double-acting valve system, which, optionally, can move the first actuator 12 in one or the other direction.
- the valve system 15 is provided via a compressed-air line 17 with compressed air coming from a compressed-air source (not shown), for example a compressed-air source at 6 bar.
- the second actuator 13 is, for example, a controllable motor. The second actuator 13 and the valve system 15 are controlled by means of the control unit 16 via electrical signals.
- the device 1 comprises a housing 20 having a first bore 21, which in use extends in the movement direction A of the weft thread, and a second bore 22, which is arranged transversely to the first bore 21.
- the housing 20 is here designed as a closed block which is provided with bores 21 and 22.
- the movement direction A of the weft thread is here also the direction from the inlet 7 of the housing 20 to the outlet 49 of the guide pipe 28.
- the movement direction A of the weft thread is here also the direction from the insertion side to the opposite side of the shed.
- At one end of the first bore 21, which also forms the inlet 7, is mounted a guide eye 23.
- the first unit 9 for generating an air current comprises a blowing device 24, which is mounted at the end 50 of the first bore 21 opposite the inlet 7.
- the blowing device 24 is designed, for example, as a "venturi".
- the blowing device 24 is connected via an opening 25 in the housing 20 to the compressed-air line 14, as shown in Figure 1 .
- By supplying compressed air via the opening 25, an air current is generated through the housing 20 in the movement direction A of the weft thread.
- the blowing device 24 here generates an air current based on the "Coanda" effect, which is commonly known from the flow theory of compressed air. This air current also gives rise to a suction effect in the area of the inlet 7.
- the blowing device 24 comprises a guide pipe 28, which is provided with an external screw thread 27 which is screwed into an internal screw thread 29 of the housing 20, which is mounted in a bore 30 in the housing 20.
- the bore 30 is arranged in the extension of the first bore 21.
- the guide pipe 28 screwed in the housing 20 is fastened via a nut 31 with respect to the housing 20.
- the blowing device 24 also comprises a profiling 32, which is mounted close to the first bore 21 and in the area of the inlet 26 of the guide pipe 28 for the generation of an air current based on the "Coanda" effect, which profiling 32, to this end, also cooperates with the bore 30 in the housing 20.
- the internal shape of the guide pipe 28 is divergent in design in order to improve the tensile force exerted on weft threads by the air current.
- the force exerted on the weft threads by a first unit 9, and also the suction effect, more particularly the suction force exerted on the weft threads from the inlet 7 by the first unit 9, can be set by adapting the pressure of the compressed-air source connected to the compressed-air line 14 and/or by adapting the distance from the profiling 32 to the bore 30.
- the device 1 further comprises a second unit 19 for exerting a mechanical tensile force on a weft thread.
- the second unit 19 is mounted in the area of a second bore 22, which is arranged transversely to the first bore 21.
- the second unit 19 comprises, inter alia, a first clamping element 33, a second clamping element 37, a first actuator 12 and a second actuator 13.
- a first clamping element 33 In the area of the second bore 22 is rotatably mounted a first clamping element 33, which can move to and fro along the second bore 22 in a movement direction B.
- the first clamping element 33 is mounted in the shown embodiment on the first actuator 12, which comprises a compressed-air cylinder 38.
- a second clamping element 37 In the area of this second bore 22 is rotatably mounted a second clamping element 37, which is driven via the second actuator 13.
- the second actuator 13 comprises a motor 34.
- This second clamping element 37 is fixedly fastened on the shaft 35 of the motor 34.
- a supporting ring 36 Between the motor 34 and the second clamping element 37 is mounted a supporting ring 36.
- the motor 34 is commanded by the control unit 16 of the weaving machine.
- the first clamping element 33 is fastened via a bearing 39 and a fastening element 40, for example a screw, onto the plunger 41 of the compressed-air cylinder 38.
- the compressed-air cylinder 38 is, for example, double-acting and is moved to and fro by the control unit 16 of the weaving machine, via the valve system 15 shown in Figure 1 , by feeding of compressed air via either the opening 42 or the opening 43.
- the compressed-air cylinder 38 can be single-acting, wherein the plunger 41 is commanded in one direction with compressed air and is returned in the other direction by a spring.
- the first actuator 12 viewed in a direction towards the guide channel 8 of the reed 5, is the foremost actuator, meaning that the first actuator 12 for the housing 20 is arranged as shown in Figure 1 .
- the first clamping element 33 moves in a direction towards the reed 5 and to the second clamping element 37.
- This offers the advantage that weft threads which extend through the device 1 according to the invention are pressed into the weft detector 6, while the clamping elements 33 and 37 move towards each other, more particularly while the first clamping element 33 of the first actuator 12 moves rearward.
- the first clamping element 33 and the second clamping element 37 are dimensioned such that a weft thread 10 or 11 guided through the first bore 21 of the housing 20 can at any moment be clamped with certainty between the clamping elements 33, 37.
- the diameter of the first bore 21, and thus also of the guide eye 23 is smaller than the diameter of the clamping elements 33 and 37 in the area of the place where the weft threads are clamped between the clamping elements 33, 37. It is herein ensured that a weft thread 10 or 11 can be clamped between the clamping elements 33 and 37 when the clamping elements 33 and 37 move towards each other in the movement direction B.
- the first clamping element 33 hereupon moves in the movement direction B, while the second clamping element 37 is only rotated and does not move in the movement direction B.
- the clamping elements 33 and 37 are arranged, in the movement direction A of the weft thread, upstream of the first unit 9 for generating an air current.
- dust is also named weaving dust and is formed, inter alia, through friction of weft threads with compressed air or with other elements.
- weft thread which, by the air current, moves through the device 1, is also forced almost centrally with respect to the first bore 21, since 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 with certainty between the clamping elements 33 and 37 when the clamping elements 33 and 37 move towards each other.
- the device 1 according to the invention can be applied as follows.
- an incorrectly inserted weft thread 11 is detected, for example by the weft detector 6, the weaving process is interrupted.
- the guide channel 8 of the reed 5 is brought by the sley 4 into the extension of the inlet 7, and an incorrectly inserted weft thread 11 is brought, together with a following inserted weft thread 10, via the inlet 7 into the device 1 according to the invention.
- the weft detector 6 detects weft thread.
- the incorrectly inserted weft thread 11 is cut off from the thread supply.
- weft thread which has been clamped between both clamping elements 33, 37, is hereupon drawn via the inlet 7 into the device 1.
- the second actuator 13 is no longer commanded, so that the weft threads are not torn or do not break.
- the clamping elements 33, 37 can be rotated, for example, over a limited angle, for example a limited angle such as a half turn, one full turn or a couple of turns. By the rotation over a limited angle, and thus the movement over a limited distance, it is avoided that weft thread is torn or breaks. When drawn over a limited distance, weft threads can deform with sufficient elasticity and the risk of weft threads being torn or breaking is limited.
- the first actuator 12 is commanded to move the clamping elements 33 and 37 apart. The portion of weft thread which is hereupon released is removed from the device 1 by the air current. This is successively repeated until the weft detector 6 no longer detects any weft thread.
- This mechanical pulling 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 rotation of the clamping elements 33 and 37 over a limited angle it is avoided that the weft thread is torn or breaks.
- the weft thread can also be removed by the air current while it is not clamped between the clamping elements 33 and 37, so that this weft thread can then be removed relatively quickly.
- the device 1 according to the invention thus makes it possible both to pull with high force on the weft thread by means of the clamping elements 33, 37 and to rapidly remove weft thread by means of the air current.
- a DC motor As the second actuator, a DC motor, a step motor, or any type of controllable motor can be applied.
- a motor having an settable drive torque can be applied, for example a torque-controlled DC motor, which allows the drive torque of the motor to be adapted to the characteristics of the weft threads, so that it is possible to drive the motor for a longer time and over a larger angle without risk of weft threads being torn or breaking.
- first actuator 12 is designed as a pneumatic cylinder, according to one variant it is also possible to apply as first actuator another type of actuator, for example a linear actuator and/or an electric actuator.
- an air current continuously flows via the compressed-air line 14 through the first unit 9, and thus also through the device 1.
- This offers the advantage that dust is removed continuously from the device 1 and no dust accumulation can take place.
- This also offers the advantage that weft thread which is present in the device 1 is removed continuously from the device 1.
- an air current only flows continuously through the device 1 if weft threads need to be removed. Should no weft threads need to be removed, it is possible at specific moments to let an air current flow through the device 1 in order to clean the device 1 of dust.
- an air current can flow continuously through the device 1 at low flow rate, and an air current can flow through the device 1 at higher flow rate if weft threads need to be removed.
- suitable valve devices can be provided in the area of the compressed-air line 14, for example valve devices which are controlled by pulsation.
- Figure 7 is shown a variant wherein the device 1 according to the invention is fastened to the weaving machine in a different way.
- the device 1 is fastened via a fastening system 2 to a crossbeam 3 of the weaving machine.
- FIGs 8 and 9 a variant of, respectively, Figures 1 and 7 is shown, wherein the device 1 according to the invention cooperates with a stretching device 47 as known from WO 2013/117564 A2 .
- the stretching device 47 facilitates the guidance of both weft threads 10 and 11 to the device 1 according to the invention.
- a hook 51 is mounted on the sley 4.
- the second weft detector 18, in cooperation with the weft detector 6 arranged next to 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 extra tensile force on the weft threads 10, 11 to be removed.
- the stretching device 47 is hereby fastened with a support 48 to the housing 20 of the device 1 according to the invention.
- clamping elements 33, 37 do not necessarily have to be provided. According to one variant, clamping elements can also be provided with a surface which can exert a large friction force on weft threads.
- the fastening system 2 is provided with elements which allow the device 1 according to the invention to be arranged in a specific position with respect to the reed 5 or with respect to the stretching device 47.
- the fastening system 2 as indicated in Figure 8 , can be provided with slots 44, 45, 46 for setting both the device 1 according to the invention and the stretching device 47 in a desired position with respect to the crossbeam 3 and/or the reed 5.
- the device 1 according to the invention can also 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 method described in EP 309 013 A1 .
- An extra blow nozzle can here be provided in order to blow weft thread in the area of the insertion side into a device 1 according to the invention, more particularly via the inlet 7 in the device 1.
- first and second are used merely to be able to differentiate between the first unit 9 and the second unit 19, between the first clamping element 33 and the second clamping element 37, and between the first actuator 12 and the second actuator 13.
- the first unit 9 can also be named the pneumatic unit
- the second unit 19 can be named the mechanical unit.
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Description
- The invention relates to a device for removing weft thread. The invention also relates to a weaving machine having such a device.
- It is known that, when a weft thread is inserted into the shed from an insertion side to an opposite side, various irregularities can occur, such as a broken weft thread or a weft thread which does not reach the opposite side of the shed.
- From
US 5129430 A ,EP 0462926 A1 ,NL 8602191 A NL 8602826 A EP 310804 A2 EP 534541 A1 - The object of the invention is a device for removing weft thread, which device allows weft thread to be removed in a reliable and rapid manner.
- This object is solved by a device having the characteristics of
Claim 1 and a weaving machine having the characteristics ofClaim 5. Preferred embodiments are defined in the dependent claims. - According 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 the first unit is arranged downstream of the second unit, so that weft thread which is guided through the device by the air current generated by the first unit can be clamped by the second unit, and wherein the device comprises a housing having a first bore, which in use extends in the movement direction of the weft thread, and a second bore, which is disposed transversely to the first bore, wherein the second unit is mounted in the area of the second bore. Within the context of the application, by a "pneumatic tensile force" is meant a tensile force generated by an air current on a weft thread, and by a "mechanical tensile force" is meant a tensile force generated by mechanical means, such as clamping elements, on a weft thread.
- According to one embodiment, the second unit comprises clamping elements, a first actuator for moving the clamping elements towards each other, and/or a second actuator for rotating the clamping elements.
- According to one embodiment, the device comprises a housing having a first bore for the guidance of a weft thread, wherein the diameter of the first bore is smaller than the diameter of the clamping elements, so that weft thread which is guided through the device can be clamped between the clamping elements of the second unit.
- The invention offers the advantage that the first unit for generating an air current through the device according to the invention is arranged, in the movement direction of the weft thread, downstream of the second unit, so that a suction effect is generated downstream of the mechanical effect, more particularly in the area of the moveable towards each other and rotatable, drivable clamping elements of the second unit. It is hence not only possible to remove dust in a favourable manner, but it is also possible to remove the mechanically removed portion of weft thread pneumatically from the device according to the invention in a simple and rapid manner.
- The invention also relates to a weaving machine which comprises a device according to the invention. In this case the weaving machine comprises a reed and the device is mounted, in the movement direction of the weft thread, past the reed. According to a preferred embodiment, the weaving machine comprises a weft detector which is mounted between the reed and the device according to the invention, wherein a first actuator, which moves a first clamping element to a second clamping element, moves the first clamping element in a direction towards the reed, so that weft thread is guided to a weft detector.
- Embodiments of the invention are described in detail below, based on various schematic figures, in which:
- Figure 1
- represents a portion of a weaving machine having a device according to the invention;
- 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 of the device according to the invention;
- Figure 5
- represents a vertical cross section transversely to the movement direction of the weft thread of the device according to the invention;
- Figure 6
- represents a horizontal cross section of the device according to the invention;
- Figure 7
- represents a variant of
Figure 1 ; - Figure 8
- represents a variant of
Figure 7 ; - Figure 9
- represents a variant of
Figure 8 . - Throughout the figures, the same or similar elements are indicated by the same reference numerals.
- In
Figure 1 , a portion of a weaving machine is schematically shown in the area of the opposite side of the shed (not shown). Adevice 1 according to the invention, which is fastened via afastening system 2 to acrossbeam 3 of the weaving machine, is herein shown. A portion of asley 4, on which areed 5 and aweft detector 6 are mounted, is further shown. - When the
weft detector 6 detects an incorrectly inserted weft thread, the weaving process is interrupted. According to one embodiment, a following insertedweft thread 10, which is connected to the incorrectly insertedweft thread 11, is next brought in a known manner through the shed to thedevice 1 according to the invention, for example according to a method as known fromNL 86 02191 A weft thread 11 from the thread supply. Bothweft threads device 1 by the blowing effect on the weft threads which is obtained by the successive activation of main blowers (not shown) and auxiliary blowers (not shown). Thedevice 1 is here designed to remove theseweft threads device 1. - In order to allow the following inserted
weft thread 10 to be brought, together with the incorrectly insertedweft thread 11, via theinlet 7 of thedevice 1 into thedevice 1, thesley 4 is brought into a position wherein theguide channel 8 of thereed 5 is arranged almost in the extension of theinlet 7, as shown inFigure 1 . When bothweft threads device 1 according to the invention, theseweft threads weft detector 6. Theseweft threads device 1 by the suction effect of thedevice 1. Next, the following insertedweft thread 10 is cut off from the thread supply, while thedevice 1 continues to exert a suction effect. In order to enable the following insertedweft thread 10 to be cut off by weft scissors (not shown) arranged near the fell line, thesley 4 is moved with thereed 5 up to the fell line, whereby the weft threads which extend to thedevice 1 are brought with certainty into theweft detector 6, so that they are with certainty detected. Should bothweft threads device 1, theweft detector 6 in this case no longer detects any weft thread, so that theweft detector 6 sends a signal to thecontrol unit 16 of the weaving machine to indicate that the two weft threads have been successfully removed. Should theweft detector 6 during a set time further detect weft thread, a switch is made to a pneumatic and mechanical removal of weft thread, as will be further described in detail. - The
device 1 according to the invention is shown in detail inFigures 1 to 6 . Thedevice 1 according to the invention comprises afirst unit 9 for generating an air current, afirst actuator 12 for generating a to-and-fro motion, and asecond actuator 13 for generating a rotary motion. Thefirst unit 9 is provided via a compressed-air line 14 with compressed air coming from a compressed-air source (not shown), for example a compressed-air source at 1.5 bar. In order to continuously remove dust, it is preferred to continuously generate an air current through thedevice 1 by means of thefirst unit 9. The continuous air current is also advantageous for keeping weft threads taken up in thedevice 1 stretched in the area of theweft detector 6, for example when thereed 5 moves up to the fell line. Thefirst actuator 12 is provided with compressed air, for example via avalve system 15, for example a double-acting valve system, which, optionally, can move thefirst actuator 12 in one or the other direction. Thevalve system 15 is provided via a compressed-air line 17 with compressed air coming from a compressed-air source (not shown), for example a compressed-air source at 6 bar. Thesecond actuator 13 is, for example, a controllable motor. Thesecond actuator 13 and thevalve system 15 are controlled by means of thecontrol unit 16 via electrical signals. - The
device 1 according to the invention comprises ahousing 20 having afirst bore 21, which in use extends in the movement direction A of the weft thread, and asecond bore 22, which is arranged transversely to thefirst bore 21. Thehousing 20 is here designed as a closed block which is provided withbores inlet 7 of thehousing 20 to theoutlet 49 of theguide pipe 28. The movement direction A of the weft thread is here also the direction from the insertion side to the opposite side of the shed. At one end of thefirst bore 21, which also forms theinlet 7, is mounted aguide eye 23. Thefirst unit 9 for generating an air current comprises ablowing device 24, which is mounted at theend 50 of thefirst bore 21 opposite theinlet 7. The blowingdevice 24 is designed, for example, as a "venturi". The blowingdevice 24 is connected via anopening 25 in thehousing 20 to the compressed-air line 14, as shown inFigure 1 . By supplying compressed air via theopening 25, an air current is generated through thehousing 20 in the movement direction A of the weft thread. The blowingdevice 24 here generates an air current based on the "Coanda" effect, which is commonly known from the flow theory of compressed air. This air current also gives rise to a suction effect in the area of theinlet 7. - According to one embodiment, the blowing
device 24 comprises aguide pipe 28, which is provided with anexternal screw thread 27 which is screwed into aninternal screw thread 29 of thehousing 20, which is mounted in abore 30 in thehousing 20. Thebore 30 is arranged in the extension of thefirst bore 21. In addition, theguide pipe 28 screwed in thehousing 20 is fastened via anut 31 with respect to thehousing 20. The blowingdevice 24 also comprises aprofiling 32, which is mounted close to thefirst bore 21 and in the area of theinlet 26 of theguide pipe 28 for the generation of an air current based on the "Coanda" effect, whichprofiling 32, to this end, also cooperates with thebore 30 in thehousing 20. This allows an air current to be guided in the movement direction A of the weft thread along a weft thread extending through thehousing 20, and thus a pneumatic tensile force to be exerted on this weft thread. As can be seen, the internal shape of theguide pipe 28 is divergent in design in order to improve the tensile force exerted on weft threads by the air current. The force exerted on the weft threads by afirst unit 9, and also the suction effect, more particularly the suction force exerted on the weft threads from theinlet 7 by thefirst unit 9, can be set by adapting the pressure of the compressed-air source connected to the compressed-air line 14 and/or by adapting the distance from theprofiling 32 to thebore 30. - The
device 1 according to the invention further comprises asecond unit 19 for exerting a mechanical tensile force on a weft thread. Thesecond unit 19 is mounted in the area of asecond bore 22, which is arranged transversely to thefirst bore 21. Thesecond unit 19 comprises, inter alia, afirst clamping element 33, asecond clamping element 37, afirst actuator 12 and asecond actuator 13. In the area of thesecond bore 22 is rotatably mounted afirst clamping element 33, which can move to and fro along thesecond bore 22 in a movement direction B. To this end, thefirst clamping element 33 is mounted in the shown embodiment on thefirst actuator 12, which comprises a compressed-air cylinder 38. In the area of thissecond bore 22 is rotatably mounted asecond clamping element 37, which is driven via thesecond actuator 13. Thesecond actuator 13 comprises amotor 34. Thissecond clamping element 37 is fixedly fastened on theshaft 35 of themotor 34. Between themotor 34 and thesecond clamping element 37 is mounted a supportingring 36. Themotor 34 is commanded by thecontrol unit 16 of the weaving machine. - The
first clamping element 33 is fastened via abearing 39 and afastening element 40, for example a screw, onto theplunger 41 of the compressed-air cylinder 38. The compressed-air cylinder 38 is, for example, double-acting and is moved to and fro by thecontrol unit 16 of the weaving machine, via thevalve system 15 shown inFigure 1 , by feeding of compressed air via either theopening 42 or theopening 43. According to a variant embodiment, the compressed-air cylinder 38 can be single-acting, wherein theplunger 41 is commanded in one direction with compressed air and is returned in the other direction by a spring. When thefirst clamping element 33 is pressed with the aid of the compressed-air cylinder 38 against thesecond clamping element 37, thissecond clamping element 37 can be driven together with thefirst clamping element 33 by themotor 34. - The
first actuator 12, viewed in a direction towards theguide channel 8 of thereed 5, is the foremost actuator, meaning that thefirst actuator 12 for thehousing 20 is arranged as shown inFigure 1 . As a result of this arrangement, thefirst clamping element 33 moves in a direction towards thereed 5 and to thesecond clamping element 37. This offers the advantage that weft threads which extend through thedevice 1 according to the invention are pressed into theweft detector 6, while theclamping elements first clamping element 33 of thefirst actuator 12 moves rearward. - According to the invention, the
first clamping element 33 and thesecond clamping element 37 are dimensioned such that aweft thread first bore 21 of thehousing 20 can at any moment be clamped with certainty between the clampingelements first bore 21, and thus also of theguide eye 23, is smaller than the diameter of the clampingelements elements weft thread elements elements first clamping element 33 hereupon moves in the movement direction B, while thesecond clamping element 37 is only rotated and does not move in the movement direction B. - According to the invention, the clamping
elements first unit 9 for generating an air current. This means that the clampingelements inlet 7 of thehousing 20 and theinlet 26 of theguide pipe 28. This offers the advantage that dust present in thehousing 20, more particularly dust present in the area of thefirst bore 21 and thesecond bore 22, is removed with certainty from thehousing 20. Such dust is also named weaving dust and is formed, inter alia, through friction of weft threads with compressed air or with other elements. By the arrangement of thefirst unit 9, in the movement direction A of the weft thread, downstream of the clampingelements device 1, is also forced almost centrally with respect to thefirst bore 21, since thefirst unit 9 exerts a tensile force on the weft thread. It is also hereby ensured that aweft thread elements elements - According to an exemplary embodiment, the
device 1 according to the invention can be applied as follows. When an incorrectly insertedweft thread 11 is detected, for example by theweft detector 6, the weaving process is interrupted. Next, theguide channel 8 of thereed 5 is brought by thesley 4 into the extension of theinlet 7, and an incorrectly insertedweft thread 11 is brought, together with a following insertedweft thread 10, via theinlet 7 into thedevice 1 according to the invention. By the arrangement of theweft detector 6, theweft detector 6 detects weft thread. Next, the incorrectly insertedweft thread 11 is cut off from the thread supply. Should theweft detector 6, during a set time, no longer detect any weft thread, this is interpreted by thecontrol unit 16 as all weft thread has been removed. Should theweft detector 6, during a set time, still detect weft thread, this is interpreted by thecontrol unit 16 as weft thread which is stuck or jammed somewhere and cannot be removed by the air current in thedevice 1. In this case, thefirst actuator 12 is commanded so that the clampingelements second actuator 13 is commanded so that thesecond clamping element 37 rotates and that also thefirst clamping element 33 rotates together with thesecond clamping element 37. Weft thread, which has been clamped between both clampingelements inlet 7 into thedevice 1. After a short time, for example a few milliseconds, thesecond actuator 13 is no longer commanded, so that the weft threads are not torn or do not break. According to one variant, the clampingelements first actuator 12 is commanded to move theclamping elements device 1 by the air current. This is successively repeated until theweft detector 6 no longer detects any weft thread. - This mechanical pulling 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 rotation of the clamping
elements elements device 1 according to the invention thus makes it possible both to pull with high force on the weft thread by means of the clampingelements - As the second actuator, a DC motor, a step motor, or any type of controllable motor can be applied. According to a variant embodiment, as the second actuator 13 a motor having an settable drive torque can be applied, for example a torque-controlled DC motor, which allows the drive torque of the motor to be adapted to the characteristics of the weft threads, so that it is possible to drive the motor for a longer time and over a larger angle without risk of weft threads being torn or breaking.
- Although in the shown embodiment the
first actuator 12 is designed as a pneumatic cylinder, according to one variant it is also possible to apply as first actuator another type of actuator, for example a linear actuator and/or an electric actuator. - According to a preferred embodiment, an air current continuously flows via the compressed-
air line 14 through thefirst unit 9, and thus also through thedevice 1. This offers the advantage that dust is removed continuously from thedevice 1 and no dust accumulation can take place. This also offers the advantage that weft thread which is present in thedevice 1 is removed continuously from thedevice 1. According to one embodiment, an air current only flows continuously through thedevice 1 if weft threads need to be removed. Should no weft threads need to be removed, it is possible at specific moments to let an air current flow through thedevice 1 in order to clean thedevice 1 of dust. According to another possibility, an air current can flow continuously through thedevice 1 at low flow rate, and an air current can flow through thedevice 1 at higher flow rate if weft threads need to be removed. To this end, suitable valve devices can be provided in the area of the compressed-air line 14, for example valve devices which are controlled by pulsation. - In
Figure 7 is shown a variant wherein thedevice 1 according to the invention is fastened to the weaving machine in a different way. In this case thedevice 1 is fastened via afastening system 2 to acrossbeam 3 of the weaving machine. - In
Figures 8 and9 , a variant of, respectively,Figures 1 and7 is shown, wherein thedevice 1 according to the invention cooperates with a stretchingdevice 47 as known fromWO 2013/117564 A2 . In this case the stretchingdevice 47 facilitates the guidance of bothweft threads device 1 according to the invention. Between theweft detector 6 and the stretchingdevice 47, ahook 51 is mounted on thesley 4. Besides, thesecond weft detector 18, in cooperation with theweft detector 6 arranged next to thereed 5, allows it to determine with certainty when theweft threads device 47 can hereby also exert an extra tensile force on theweft threads device 47 is hereby fastened with asupport 48 to thehousing 20 of thedevice 1 according to the invention. - It is clear that flat and/or
smooth clamping elements - The
fastening system 2 is provided with elements which allow thedevice 1 according to the invention to be arranged in a specific position with respect to thereed 5 or with respect to the stretchingdevice 47. To this end, thefastening system 2, as indicated inFigure 8 , can be provided withslots device 1 according to the invention and the stretchingdevice 47 in a desired position with respect to thecrossbeam 3 and/or thereed 5. - According to one variant (not shown), the
device 1 according to the invention can also 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 method described inEP 309 013 A1 device 1 according to the invention, more particularly via theinlet 7 in thedevice 1. - Within the context of the application, "first" and "second" are used merely to be able to differentiate between the
first unit 9 and thesecond unit 19, between thefirst clamping element 33 and thesecond clamping element 37, and between thefirst actuator 12 and thesecond actuator 13. Thefirst unit 9 can also be named the pneumatic unit, while thesecond unit 19 can be named the mechanical unit.
Claims (7)
- 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 second unit (19) for generating a mechanical tensile force on a weft thread (10, 11), wherein in the movement direction (A) of the weft thread the first unit (9) is arranged downstream of the second unit (19), so that weft thread (10, 11) which is guided through the device (1) by the air current generated by the first unit (9) can be clamped by the second unit (19), characterized in that the device (1) comprises a housing (20) having a first bore (21), which in use extends in the movement direction (A) of the weft thread, and a second bore (22), which is disposed transversely to the first bore (21), wherein the second unit (19) is mounted in the area of the second bore (22).
- Device according to Claim 1, characterized in that the second unit (19) comprises clamping elements (33, 37) and a first actuator (12) for moving the clamping elements (33, 37) towards each other along the second bore (22).
- Device according to Claim 2, characterized in that the second unit (19) comprises a second actuator (13) for rotating the clamping elements (33, 37).
- Device according to Claim 2 or 3, characterized in that the diameter of the first bore (21) is smaller than the diameter of the clamping elements (33, 37), so that weft thread (10, 11) which is guided through the device (1) can be clamped between the clamping elements (33, 37) of the second unit (19).
- Weaving machine, characterized in that the weaving machine comprises a device (1) according to any one of Claims 1 to 4.
- Weaving machine according to Claim 5, characterized in that the weaving machine comprises a reed (5), and in that the device (1) is mounted, in the movement direction (A) of the weft thread, past the reed (5).
- Weaving machine according to Claim 5 or 6, characterized in that the weaving machine comprises a weft detector (6) which is mounted between the reed (5) and the device (1), and in that a first actuator (12), which moves a first clamping element (33) to a second clamping element (37), moves the first clamping element (33) in a direction towards the reed (5), so that weft thread (10, 11) is guided to a weft detector (6).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE2013/0762A BE1021785B1 (en) | 2013-11-07 | 2013-11-07 | DEVICE FOR REMOVING WRAIN THREAD |
PCT/EP2014/072562 WO2015067465A1 (en) | 2013-11-07 | 2014-10-21 | Device for removing weft thread |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3066243A1 EP3066243A1 (en) | 2016-09-14 |
EP3066243B1 true EP3066243B1 (en) | 2017-09-27 |
Family
ID=49916759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14786523.2A Active EP3066243B1 (en) | 2013-11-07 | 2014-10-21 | Device for removing weft thread |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3066243B1 (en) |
CN (1) | CN105874113B (en) |
BE (1) | BE1021785B1 (en) |
WO (1) | WO2015067465A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5129430A (en) * | 1989-08-25 | 1992-07-14 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Weft removal device with measurement of broken yarn piece |
US5199468A (en) * | 1990-06-21 | 1993-04-06 | Sulzer Brothers Limited | Weft yarn clearing device |
JPH04241141A (en) * | 1990-12-29 | 1992-08-28 | Toyota Autom Loom Works Ltd | Device of treating weft in jet loom |
JPH05156549A (en) * | 1991-12-03 | 1993-06-22 | Nissan Motor Co Ltd | Weft-treating apparatus of fluid jet loom |
JP3307029B2 (en) * | 1993-11-10 | 2002-07-24 | 株式会社豊田自動織機 | Defective weft insertion yarn removal device for fluid jet loom |
JP2003313751A (en) * | 2002-04-26 | 2003-11-06 | Tsudakoma Corp | Method and apparatus for removing defective thread in loom |
-
2013
- 2013-11-07 BE BE2013/0762A patent/BE1021785B1/en active
-
2014
- 2014-10-21 EP EP14786523.2A patent/EP3066243B1/en active Active
- 2014-10-21 CN CN201480061132.3A patent/CN105874113B/en active Active
- 2014-10-21 WO PCT/EP2014/072562 patent/WO2015067465A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
CN105874113B (en) | 2018-11-13 |
EP3066243A1 (en) | 2016-09-14 |
CN105874113A (en) | 2016-08-17 |
WO2015067465A1 (en) | 2015-05-14 |
BE1021785B1 (en) | 2016-01-18 |
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