BE1024755B1 - WASTE END-STREK DEVICE FOR A WEAVING MACHINE - Google Patents

Abstract

Waste end-stretching device for a weaving machine with a suction nozzle (32) provided with a lateral suction slot (34) extending along the longitudinal direction (52) of the suction nozzle (32) for sucking waste ends (28) and with an opening (28) 35) provided at a first end of the suction nozzle (32) facing the edge of the woven fabric (3) for transferring waste ends (28) held in the suction nozzle (32) in a direction perpendicular to the longitudinal direction (52) of the suction nozzle (32), and wherein a bending element (41) is provided between the opening (35) and the edge of the woven fabric (3), which bending element (41) projects at least partially beyond the opening (35) for bending over waste ends (28) held in the suction nozzle (32) in their path between the edge of the woven fabric (3) and the opening (35). A weaving machine with such a waste end-stretching device (30), and the use of such a waste end-stretching device (30).

Description

(30) Priority data:

(73) Holder (s):

PICANOL NV 8900, IEPER Belgium (72) Inventor (s):

GHESQUIERE Marnix 8930 LAUWE Belgium (54) WASTE-END STRETCH FOR A WEAVING MACHINE (57) Waste-end stretching device for a weaving machine with a suction nozzle (32) provided with a lateral suction slot (34) along the longitudinal direction (52) of the suction nozzle (32) extends for aspirating waste ends (28) and is held with an opening (35) provided at a first end of the suction nozzle (32) facing the edge of the woven fabric (3) for transferring waste ends (28) in the suction nozzle (32) in a direction perpendicular to the longitudinal direction (52) of the suction nozzle (32), and wherein a deflecting element (41) is provided between the opening (35) and the edge of the woven fabric (3), which bending member (41) protruding at least partially beyond the opening (35) to bend waste ends (28) held in the suction nozzle (32) in their path between the edge of the woven fabric (3) and the opening (35). A weaving machine with such a waste end stretcher (30), and the use of such a waste end stretcher (30).

15 4

Fig. 5

BELGIAN INVENTION PATENT

FPS Economy, K.M.O., Self-employed & Energy

Intellectual Property Office

Publication number: 1024755 Filing number: BE2016 / 0178

International classification: D03D 47/30 Date of issue: 27/06/2018

The Minister of Economy,

Having regard to the Paris Convention of 20 March 1883 for the Protection of Industrial Property;

Having regard to the Law of March 28, 1984 on inventive patents, Article 22, for patent applications filed before September 22, 2014;

Having regard to Title 1 Invention Patents of Book XI of the Economic Law Code, Article XI.24, for patent applications filed from September 22, 2014;

Having regard to the Royal Decree of 2 December 1986 on the filing, granting and maintenance of inventive patents, Article 28;

Having regard to the application for an invention patent received by the Intellectual Property Office on 29/11/2016.

Whereas for patent applications that fall within the scope of Title 1, Book XI, of the Code of Economic Law (hereinafter WER), in accordance with Article XI.19, § 4, second paragraph, of the WER, the granted patent will be limited. to the patent claims for which the novelty search report was prepared, when the patent application is the subject of a novelty search report indicating a lack of unity of invention as referred to in paragraph 1, and when the applicant does not limit his filing and does not file a divisional application in accordance with the search report.

Decision:

Article 1

PICANOL NV, Steverlyncklaan 15, 8900 IEPER Belgium;

represented by

CARDOEN Marnick, Steverlyncklaan 15, 8900, YPRES;

a Belgian invention patent with a term of 20 years, subject to payment of the annual fees as referred to in Article XI.48, § 1 of the Code of Economic Law, for: WASTE END STRETCH FOR A WEAVING MACHINE.

INVENTOR (S):

GHESQUIERE Marnix, Steenovenstraat 4, 8930, LAUWE;

PRIORITY:

BREAKDOWN:

Split from basic application: Filing date of the basic application:

Article 2. - This patent is granted without prior investigation into the patentability of the invention, without warranty of the Merit of the invention, nor of the accuracy of its description and at the risk of the applicant (s).

Brussels, 27/06/2018,

With special authorization:

BE2016 / 0178

Waste-end stretching device for a weaving machine.

Technical field and state of the art.

The invention relates to a waste-end stretching device for a weaving machine and a weaving machine comprising a waste-end stretching device, in particular an air jet weaving machine.

In an airjet weaving machine, a weft thread is introduced by means of air supplied by one or more main blowers and successive auxiliary blowers provided along a weft insertion channel. For example, in US 3,901,286, an air jet weaving machine is shown. The portion of an inserted weft thread that extends beyond a side edge of a fabric and is not woven into the fabric is referred to as a waste end. For removal of the waste ends after they have been cut, US 3,901,286 discloses a conduit disposed under the fabric at the width of a wide web provided for the woven fabric, the conduit having a mouth facing the fabric from below.

During the time interval between two weft insertions, part of the weft thread remains in the main blower or associated main blower, and the main blower continues to blow against the part of the weft thread that is disposed inside the main blower. This can cause damage to the weft thread. When weaving a weft thread with a high torsion, for example, the longer blowing time can lead to de-threshing of the weft thread. Similar when weaving multifilament weft threads, where several fine yarns together form one weft thread, due to the relatively longer length

BE2016 / 0178 blowing time, the part of the weft thread that is subject to the longer blowing time can be unraveled. The de-warped or unraveled ends of the weft thread have different characteristics from the rest of the weft thread and may cause visually observable weaving errors.

[0004] To solve this problem, it is known to use longer waste ends, in other words, to weave weft threads with such waste end length that a damaged or worse front end of the weft thread after an insertion insert past an edge of stretches a fabric to be woven. In other words, the damaged or worse front end of the weft thread is not woven into the fabric, but protrudes beyond the woven fabric.

The long drop ends can swirl together and form a tangle next to the fabric interfering with the subsequent weft threads inserted. There is also a risk of such long long waste ends jumping back into a next weaving section, in other words penetrating back into the weaving section and weaving warp threads in between.

Summary of the invention.

It is an object of the invention to provide a waste-end straightening device for a weaving machine and a weaving machine comprising a waste-end straightening device, wherein relatively long waste ends can also be held with certainty. It is a further object of the invention to provide a use of a waste-end stretching device in a weaving machine.

BE2016 / 0178 This object is solved by the waste end stretcher with the features of claim 1, the weaving machine with the features of claim 14 and the use of a waste end stretcher with the features of claim 15.

Preferred embodiments are defined in the dependent claims.

[0008] In a first aspect, a weaving loom end stretching device is provided, the litter end stretching device comprising a suction nozzle adapted to be inserted in the lane of a litter end of an inserted weft thread that protrudes beyond an edge of a woven fabric, the suction nozzle is adapted to exert a suction force along a longitudinal direction of the suction nozzle, the suction nozzle being adapted to be attached to the weaving machine so that the longitudinal direction of the suction nozzle extends parallel to the weft insertion direction, the suction nozzle being provided with a lateral suction slot extending along the longitudinal direction of the suction nozzle for aspirating waste ends into the suction nozzle and having an opening provided at a first end of the suction nozzle facing the edge of the woven fabric for transferring waste ends held in the suction nozzle in a direction perpendicular to the longitudinal direction of the suction nozzle, and wherein a deflecting element is provided between the opening and the edge of the woven fabric, the deflecting element protruding at least partially beyond the opening for deflecting part of the waste ends held in the suction nozzle in their path between the edge of the woven fabric and the opening.

[0009] One end of the suction nozzle facing the edge

BE2016 / 0178 of the woven fabric is referred to as the first end. A wall at this first end is referred to as the first end wall.

Front ends or drop ends of inserted weft threads are sucked into the suction nozzle through the lateral suction slot.

Prior to cutting the fabric, the drop ends are moved together with the fabric in a fabric pull-up direction, generally the path of movement of the fabric is not a linear path. The fabric is usually guided along a wide holder and in some cases additionally along guide rollers. By means of the opening provided at the first end, the waste ends can move with the tissue while being held by the suction nozzle. The opening is shielded by the deflector element to bend a portion of the waste ends held in the suction nozzle and extending radially between the suction nozzle and the edge of the tissue away from the opening, so that waste ends held in the suction nozzle are bent over in their path between the edge of the woven fabric and the opening, thereby avoiding pulling the fabric or, if appropriate, a waste tape into the suction nozzle.

In one embodiment, the waste ends exit the suction nozzle through the opening after the tissue has been transferred a certain distance. In other embodiments, the waste ends are cut and disposed via a second end opposite the first end of the suction nozzle.

In preferred embodiments, the waste ends are guided along a bottom portion of the opening. In particular, the weaving machine may include a wide holder for holding the woven fabric wide. Therefore, plug in

BE2016 / 0178 preferred embodiments, the deflector element at least with its bottom edge past the opening for deflecting waste ends held in the suction nozzle in their path between the edge of the woven fabric and the opening.

In one embodiment, the bending element is formed integrally with a body of the suction nozzle. In preferred embodiments, the bending member and the body of the suction nozzle are formed as separate parts, the bending member being positioned relative to the body of the suction nozzle such that a gap is provided between a first end wall of the body of the suction nozzle and the bending member, wherein the size of the slit is chosen to be large enough to avoid trapping ends between the first end wall of the suction nozzle body and the deflector element. The size or width of the slit is appropriately chosen by the skilled person depending on the properties of the material to be woven. In preferred embodiments, the width of the gap is between about 2 mm and about 4 mm.

In one embodiment, the first end wall of the suction nozzle body is stepped such that a lower portion of the first end wall disposed below the lateral suction slot is positioned further away from the bending member than an upper portion of the first end wall. By bending the waste ends by means of the bending element, the waste ends are guided along the edge of the opening on the bottom part of the first end wall. By means of the stairs, sufficient free space is provided for guiding the waste ends.

BE2016 / 0178 In one embodiment, an opening is provided which extends in a direction perpendicular to the longitudinal direction of the suction nozzle. In preferred embodiments, the opening and the bending member have complementary annular, round or semicircular cross sections. In some embodiments, the fabric is bent through the center of the wide holder. By providing an annular, round or semicircular opening and a respective bending element, a length of a non-linear path of a weft thread extending between the opening and the edge of the fabric through the bending element is at least substantially constant during transmission along the opening. Thus, a relative movement of the waste ends held by the suction nozzle in the longitudinal direction of the suction nozzle is avoided or at least minimized.

In one embodiment, the bending element is directly attached to a frame of the weaving machine. In preferred embodiments, the bending member is attached to the body of the suction nozzle. For this purpose, in one embodiment, the bending member is attached to the first end wall of the body of the suction nozzle in an area above the opening. In preferred embodiments, the top portion of the first end wall of the body of the suction nozzle is provided with a mounting protrusion, which mounting protrusion defines an internal channel from the suction nozzle to the first end, the deflection member being attached to the mounting protrusion.

In one embodiment, the waste end stretching device further includes a mounting body, the suction nozzle being attached to or integrally formed with the

BE2016 / 0178 mounting body, and which mounting body is adapted to be mounted adaptably in position to a frame of the weaving machine. For example, the position is only adjustable in the longitudinal direction of the suction nozzle to adjust the position of the waste end stretcher for different tissue widths and / or different waste end lengths.

The waste end stretcher further comprises, in one embodiment, a ring-jet device for providing suction.

In one embodiment, the ring-jet device is attached to the mounting body and / or the suction nozzle, and thus movable together with the suction nozzle.

In one embodiment, the waste ends are inserted into the tissue. The waste ends are preferably not inserted, because of the poor quality of the front ends of the waste ends. In one embodiment, the weaving machine is provided with catch threads or waste warp threads for forming a waste tape and the inserted weft threads are thereby kept stretched. In an embodiment, a wide holder having a length exceeding the width of the fabric is provided for guiding capture threads or a scrap tape that has been woven using capture threads. In preferred embodiments, the waste-end stretcher includes a guide member for guiding the capture threads, the guide member positioned between the bending member and the edge of the woven fabric, for example, at a distance from the wide holder.

BE2016 / 0178 [0020] The guiding element is in one embodiment attached to the frame of the weaving machine between the bending element and the edge of the woven fabric, which edge is guided, for example, by means of a wide holder. In preferred embodiments, the bending member is formed integrally or as a structural unit with the guide member.

In one embodiment, the guide element is provided with a groove to keep the waste tape parallel to the edge of the fabric. In preferred embodiments, the guide member includes a cone-shaped, double-cone, diabolo, or hourglass-shaped intermediate member disposed adjacent to the bending member, the intermediate member containing at least a cone-shaped first portion with an increasing diameter in a direction away from the bending member, and the smallest diameter of the first part is smaller than the diameter of the bending element. The waste belt is guided parallel to the edge of the fabric by means of the intermediate element together with the bending element. In one embodiment, the intermediate element further includes a cone-shaped second part with a decreasing diameter in a direction away from the bending element, the second part being arranged between the bending element and the first part. In the context of the application, such an intermediate element containing two conical parts is referred to as a double-conical, diabolo-shaped or hourglass-shaped intermediate element. In an embodiment, however, the first and second cone-shaped part differ in length and / or opening angle and / or the first and the second part both have the shape of a truncated cone. The intermediate element is made of a material with a low coefficient of friction when used with the weft threads, so that the waste tape is smoothly transferred along the intermediate element.

BE2016 / 0178 In one embodiment, the guide member further includes a ring disposed adjacent the intermediate member on one side away from the bending member, the ring being rotatably mounted relative to the intermediate member about an axis parallel to the weft insertion direction. The ring is adapted to be rotated by contact with the weft threads transmitted along the guide element. For this purpose, the ring is preferably made of a material with a higher coefficient of friction when used with the weft threads than the intermediate element. In addition, in an embodiment the ring is arranged slightly eccentrically relative to the intermediate element, the ring preferably having a diameter slightly greater than the largest diameter of the intermediate element, so that the weft threads contact the ring and not the intermediate element .

In a preferred embodiment, the lateral suction slot of the suction nozzle is limited by a lower lip and an upper lip, the drop-end stretching device being adapted to be mounted on the weaving machine with the lateral suction slot close to and parallel to a support beam of a tissue support of the weaving machine, wherein the lower lip is arranged at least mainly at the level of the support beam for guiding waste ends via the support beam and the lower lip in the suction nozzle.

In a second aspect, a weaving machine comprising a wide holder along which wide holder a fabric is guided and a waste end stretcher is provided, the waste end stretcher comprising a suction nozzle adapted to apply a suction force along a

BE2016 / 0178 longitudinal direction of the suction nozzle, the suction nozzle being mounted stationary on the weaving machine in an extension of the wide holder in an axial direction of the wide holder and with the length direction of the suction nozzle extending parallel to the weft insertion direction. In other words, the waste-end stretching device is mounted on the weaving machine such that the longitudinal direction of the suction nozzle is arranged coaxially with or parallel to the axial direction of the wide holder.

According to a third aspect, a use is provided with a waste-end stretching device in a weaving machine comprising a wide holder along which wide holder a fabric is guided, the waste-end stretching device being a suction nozzle adapted to exert a suction force along the longitudinal direction of the suction nozzle, the suction nozzle being mounted stationary on the weaving machine in an extension of the wide holder in an axial direction of the wide holder and with the longitudinal direction of the suction nozzle extending parallel to the weft insertion direction. In other words, the waste-end stretching device, when used in the weaving machine, is arranged such that the longitudinal direction of the suction nozzle is arranged coaxially or parallel to the axial direction of the wide holder.

Brief description of the drawings.

In the following, an embodiment of the invention is described in detail with reference to the drawings. Throughout the drawings, like elements are designated by like reference numbers.

BE2016 / 0178

Figure 1 is a perspective view of a drop-end puller from the front;

Figure 2 is a perspective view of the waste end stretcher of Figure 1 from the rear;

Figure 3 is a cross-sectional view of a weaving machine with a fabric support and a waste-end stretcher;

Figure 4 is a perspective view of a fraction of the waste end stretcher of Figure 2;

Figure 5 is a perspective view of the weaving machine with the tissue support, the wide holder and a waste-end stretcher from the rear of the weaving machine and from above;

Figure 6 is a perspective view of the weaving machine from the rear;

Figure 7 is a view of the weaving machine of Figure 4 from above; and

Figure 8 is a cross-sectional view of a weaving machine with a fabric support and a wide holder.

Detailed description of embodiments of the invention.

Figures 1 and 2 are perspective views of a waste-end stretcher 30 from the front and from the rear, respectively. The waste end stretcher 30 shown in Figures 1 and 2 includes a mounting body 31, a suction nozzle 32, a guide member 40 with a deflector 41 attached to the body of the suction nozzle 32 at its first end 58, and a ring-jet device 33 which is attached to the mounting body 31 at a second end 59 of the suction nozzle 32. In the context of the application, one end of the suction nozzle 32, which is in use, is placed

BE2016 / 0178 to face an edge of a woven fabric referred to as first end 58. An opposite end of the suction nozzle 32 is referred to as second end 59. A wall at first end 58 is referred to as first end wall 46.

The suction nozzle 32 has a lateral suction slot 34 extending along the longitudinal direction 52 of the suction nozzle 32 for aspirating front ends or drop ends of inserted weft threads (not shown) in the suction nozzle 32. The suction nozzle 32 further includes an opening 35 provided at its first end 58. The opening 35 at the first end 58 allows the waste ends to move in a direction perpendicular to the longitudinal direction 52 of the suction nozzle 32 of the waste end extractor 30 while holding the waste ends in the suction nozzle 32 and through the suction applied. In order to prevent waste ends from being drawn too deep into the suction nozzle 32 when they are transferred perpendicular to the longitudinal direction 52 along the opening 35, the opening 35 is shielded by means of the deflecting element 41 so that drop ends of inserted weft threads (not shown in Figures 1 and 2), which are held in the suction nozzle 32 are bent in their path between the edge of the woven fabric and the opening 35. In the embodiment shown, the opening 35 is provided with an annular cross-section and the bending element 41 is provided with a round cross-section the diameter of the deflector element 41 being greater than the diameter of the opening 35. The deflector element 41 projects at least with its bottom edge 47 past the opening 35 to deflect drop ends 28 held in the suction nozzle 32 in their path between the rim of the woven fabric 3 and the opening 35.

BE2016 / 0178 A suction force along a longitudinal direction 52 of the suction nozzle 32 is exerted by means of the ring-jet device 33 with a nipple 36 for an air supply. Preferably, compressed air is supplied in a pulsating manner via the nipple 36 to the ring-jet device 33, in particular in a non-continuous manner, so that the waste ends 28 can be easily sucked into the suction nozzle 32, and can easily pass along the opening 35 be moved.

In the shown embodiment, an internal channel 49 of the suction nozzle 32 has an at least substantially round cross section. In the embodiment shown, the suction nozzle 32 can be attached to a weaving machine 11 (see Figures 3 to 7) by means of two bolts 37, the position of which is adjustable or adjustable in a direction parallel to the weft insertion direction. In the shown embodiment, a support 22 comprising two support bolts 26 is provided, which is fixedly fixed in position to a frame 2 (see figures 3 to 7) of the weaving machine 11, the fixing body 31 being adjustable in position on the support 22 by means of the two bolts 37 are attached. When the position of the mounting body 31 is adjusted, the ring-jet device 33 attached to the mounting body 31 and the suction nozzle 32 attached to the mounting body 31 are adjusted together in position.

The guide element 40 shown is provided (viewed in the longitudinal direction 52) with the bending element 41, an intermediate element 42, and a ring 43. The intermediate element 42 shown has a double cone shape with a conical first part of increasing diameter in one direction away from the first

BE2016 / 0178 end wall 46 and a conical second part arranged between the first part and the bending element 41 with a decreasing diameter in a direction away from the first end wall 46. In the shown embodiment the second part is considerably shorter than the first part, for example the length of the second part is approximately one third of the length of the first part. In the embodiment shown, the bending element 41 and the intermediate element 42 are, for example, integrally formed of a material which exerts some small frictional forces on the waste ends or a waste belt which is transferred along the guide element 40. The ring 43 is formed separately and is rotatably mounted on the intermediate element 42 and / or the body of the suction nozzle 32 by means of a bolt 45. In one embodiment, the ring 43 is made of rubber which exerts a higher frictional force on the drop ends than the rest of the guide element 40. The diameter of the ring 43 in the embodiment shown is slightly larger than the largest diameter of the intermediate element 42. Furthermore, the ring 43 in the shown embodiment is arranged slightly eccentrically with respect to the intermediate element 42, and extends more to the vicinity of the lower part for guiding the weft threads. The diameter of the deflecting element 41 is greater than the smallest diameter of the intermediate element 42. The diameter of the deflecting element 41 is preferably at least substantially equal to the largest diameter of the intermediate element 42. In an alternative embodiment, instead of a guide element 40, the bending element 41 provided at the first end 58 of the body of the suction nozzle 32.

In the context of the application, a portion of the first end wall 46 of the body of the suction nozzle 32 is disposed below the lateral suction slot 34 designated as lower portion 50 of

BE2016 / 0178 the first end wall 46. A part of the first end wall 46 of the body of the suction nozzle 32 arranged above the lateral suction slot 34 is indicated as the upper part 51 of the first end wall 46.

In the shown embodiment, the top portion 51 of the first end wall 46 is provided with a mounting projection 44, which mounting projection 44 defines the internal channel 49 of the suction nozzle 32 to the first end 58. The guide element 40 is attached to the mounting projection 44.

In the shown embodiment, the first end wall 46 of the body of the suction nozzle 32 is stepped such that the lower part 50 of the first end wall 46 is positioned further away from the bending member 41 than the upper part 51 of the first end wall 46. Thereby, a sufficient free space for the waste ends is maintained in the suction nozzle 32 provided between the bottom part 50 of the first end wall 46 and the bending element 41 below the opening 35. The bending element 41 is preferably fixed in such a way that a small gap 48 also remains. between the top portion 51 of the first end wall 46 and the deflector element 41 to prevent weft threads from being caught between the body of the suction nozzle 32 and the deflector element 41.

Figure 3 is a cross-sectional view of the waste end stretching device 30 of Figures 1 and 2 mounted on a weaving machine having a tissue support 1 with a support beam 20 extending in a stop direction into a channel of a reed 4, with only the suction nozzle 32 has been shown and, for the sake of clarity, it

BE2016 / 0178 bending element 41 is not shown. As shown in Figure 4, the mounting protrusion 44 protrudes from the top portion 51 of the first end wall 46, which defines the internal channel 49 of the suction nozzle 32 to the first end 58. As shown in Figure 3, the opening 35 thus formed is essentially of an annular shape, in other words the opening 35 is formed by a free span between the inner channel 49 and the mounting projection 44.

The guide element 40 is attached to the intermediate element 42 by means of a bolt 45, so that the ring 43 of the guide element 40 remains rotatable relative to the intermediate element 42. The deflecting element 41 and the intermediate element 42, which form one assembly, are fixed to the suction nozzle 32 by a bolt 57 (shown in Figure 4). The bolt 57 extends through the opening 54 (shown in Figure 3) of the mounting protrusion 44, and can be tightened with a tool extending through the suction nozzle 32 in use. In order to avoid twisting of the bending member 41 and the intermediate member 42 around the bolt 57, in the embodiment shown in Figures 3 and 4, a pin 55 is provided which projects from an end surface 56 of the mounting projection 44 and can cooperate with an opening (not shown) in the deflecting element 41 and / or the intermediate element 42. The deflecting element

41 is clamped against the end surface 56.

As shown in Figure 3, the lateral suction slot 34 is limited by a lower lip 38 and an upper lip 39. The waste-end stretching device 30 is mounted on the frame 2 of the weaving machine with the lateral suction slot 34 extending parallel to the support beam 20 of the tissue support 1, with the lower lip

BE2016 / 0178 is arranged at least mainly at the level of the support beam 20 of the tissue support 1 to guide drop ends via the support beam 20 and the lateral suction slot 34 into the suction nozzle 32.

Figure 8 schematically shows a cross-sectional view of a weaving machine 11 with a tissue support 1 and a wide holder 23. The tissue support 1 shown is attached to a frame 2 of a weaving machine to support a tissue 3. The fabric support 1 extends at least over the width of the fabric 3, for example over a length of the order of several meters. In addition, a reed 4, a drawer 5, a clamping slat 6, drawer legs 7 and a drawer shaft 8 are shown. In the embodiment shown, the reed 4 is clamped on the drawer 5 by means of the clamping slat 6 and bolts 25. In the embodiment shown, a guide roller 24 for the fabric 3 is further provided downstream of the wide holder 23 next to the fabric support 1. For a weft insertion, the weft thread is blown into a weaving compartment by means of a main blower (not shown) and a plurality of additional blowers 9, which are mounted on the drawer 5 in a known manner.

The fabric support 1 contains at least one profiled support beam 20, supported by a plurality of support elements 10, which are attached to the frame 2 by means of screw elements 21. The profiled support beam 20 is mounted such that its end faces the reed 4 extending into a channel of the reed 4 at stop. In the shown embodiment the support element 10 is provided with a collar ΊΊ which allows to fix the support element 10 to the frame 2 with high accuracy. For example, in US 7,770,605 B2 such a tissue support 1 is shown, the contents of which are hereby incorporated by reference.

BE2016 / 0178 The waste end straightener 30 and its use in a weaving machine will be described in more detail below with reference to Figures 5 to 7.

Figures 5, 6 and 7 schematically show the weaving machine 11 with the tissue support 1, the wide holder 23 and the waste end stretching device 30 shown in Figures 1 and 2, respectively, in a perspective view from the rear of the weaving machine and from above, in a perspective view. view from the back and in îo a view from the top. As shown in Figure 3, the lateral suction slot 34 is limited by the lower lip 38 and the upper lip 39. The waste end stretcher 30 is mounted on the frame 2 of the weaving machine with the opening 35 facing an edge of the fabric 3, and thus, towards the wide holder 23 and the lateral is suction slot 34 which extends parallel to the weft insertion direction 29, in other words parallel to a stop line of the fabric 3, the lower lip 38 at least substantially at the level of the support beam 20 of the fabric support 1 is arranged to guide drop ends through the support beam 20 and the lateral suction slot 34 into the suction nozzle 32. Here, the suction nozzle 32 is mounted stationary on the weaving machine 11, and in an extension of the wide holder 23 in an axial direction 53 of the wide holder 23 and with the longitudinal direction 52 of the suction nozzle 32 extending parallel to the weft insertion direction 29.

In the embodiment shown in Figures 5 to 7, trapping threads 12 (also referred to as waste warp threads) are provided for capturing the drop ends of the inserted weft threads

13. The webbing woven by means of the catch threads 12 is referred to as waste tape 18. In an alternative embodiment, no catch threads are provided and the

BE2016 / 0178 waste ends inlaid, for example with the aid of a device as described in WO 2015/189033 A1 and / or EP 2176455 B1, the contents of which are hereby incorporated by reference.

In the shown embodiment, a separate auxiliary reed 14 (see Figures 4 and 6) is provided for the catching wires 12, which is mounted on the drawer 5. Weft thread detectors 15, 16 are provided at the arrival end of the reed 4 and the auxiliary reed 14. The waste belt 18 and the waste ends are cut off from the fabric 3 by means of a schematically shown cutting device 17. As can best be seen in figures 6 and 7, in the shown embodiment a clamping device 19 containing for instance two nozzles is provided on the auxiliary reed 14 for tensioning already inserted weft threads. Such a tensioning device 19 is described, for example, in WO 2015/177155 A1, the contents of which are hereby incorporated by reference.

In the shown embodiment, the guide element 40 is positioned at a distance from the wide holder 23, the position of the wide holder 23 being selected to correspond at least substantially to the width of the fabric 3. The waste belt 18 is guided along the intermediate element 42 of the guide element 40, the bending element 41 of a larger diameter than the suction nozzle 32 mechanically and smoothly mechanically preventing the waste belt 18 from being sucked into the suction nozzle 32.

As described above, the rotatably mounted ring 43 of the guide element 40 has a slightly larger diameter than the largest diameter of the intermediate element 42. The

BE2016 / 0178 ring 43 will thus make contact with the weft threads which extend between the wide holder 23 and the suction nozzle 32 via the guiding element 40, and the weft threads are guided during the movement of the fabric 3 along the ring 43.

In use, the weft threads are inserted and tensioned by the tensioning device 19, then struck while the front end or drop-off end of the inserted weft thread extending past the catch threads 12 is sucked through the lateral suction slot 34. In a further When transferring the fabric 3, the waste ends remain stretched by means of the waste end stretching device 30 while those with the tissue 3 are transferred in the pull-up direction, the waste ends being moved along the opening 35. The waste belt 18 is guided by means of the intermediate element 42. The deflecting element 41 prevents the waste belt 18 from being drawn into the suction nozzle 32. In the embodiment shown, upon further transfer of the fabric 3, the waste ends will eventually be removed from the suction nozzle 32 through the opening 35. In other embodiments, the waste ends are cut and removed through the second end 59 of the suction nozzle 32.

It is clear that the fastening of the suction nozzle 32 in a weaving machine is not limited to the use of the support 22 and the fastening body 31, but that for this purpose an alternative fastening elements can be used which adjust the position of the suction nozzle 32 relative to the weaving machine.

The waste end stretcher, the weaving machine and the use of a waste end stretcher according to the invention are

BE2016 / 0178 is not limited to the embodiments described by way of example and shown in the drawings. Alternatives and combinations of the described and shown embodiments covered by the claims are also possible.

BE2016 / 0178

Claims (5)

Conclusions. A loom scrap-end stretcher comprising a suction nozzle (32) adapted to be inserted into the path of a scrap-thread drop-off end (28) extending beyond an edge of a woven fabric (3), the suction nozzle (32) adapted to apply a suction force along a longitudinal direction (52) of the suction nozzle (32), characterized in that the suction nozzle (32) is adapted to be mounted on the weaving machine (11) so that the longitudinal direction (52) of the suction nozzle (32) extends parallel to the weft insertion direction (29), the suction nozzle (32) having a lateral suction slot (34) extending along the longitudinal direction (52) of the suction nozzle (32) for vacuuming waste ends (28) in the suction nozzle (32) and with an opening (35) provided at a first end (58) of the suction nozzle (32) facing the edge of the woven fabric (3) for transferring waste blades (28) held in the suction nozzle (32) in a direction perpendicular to the longitudinal direction (52) of the suction nozzle (32), and wherein a deflecting element (41) is located between the opening (35) and the edge of the woven fabric (3 ), which deflector element (41) projects at least partially beyond the opening (35) for deflecting drop ends (28) held in the suction nozzle (32) in their path between the edge of the woven fabric (3) and the opening ( 35). Waste-end stretching device according to claim 1, characterized in that the bending element (41) projects at least with its bottom edge (47) beyond the opening (35) for bending waste ends (28) held in the suction nozzle (32) in their path between the edge of the woven fabric (3) and the opening (35). BE2016 / 0178 Waste-end stretching device according to claim 1 or 2, characterized in that the bending element (41) and a body of the suction nozzle (32) are formed as separate parts, the bending element (41) such with respect to the body of the suction nozzle ( 32) is positioned that a wedge (48) is provided between a first end wall (46) of the body of the suction nozzle (32) and the bending element (41), the size of the wedge (48) being chosen large enough to avoid trapping ends (28) between the first end wall (46) of the suction nozzle body (32) and the deflector element (41). 4, characterized in that the opening (35) and the bending element (41) have complementary annular, round or semicircular cross sections. Waste end stretching device according to any one of claims 1 to 5, characterized in that the top part (51) of the first end wall (46) of the body of the suction nozzle (32) is provided with a mounting projection (44), which mounting projection (44) is bounded to the first end (58) through an internal channel (49) of the suction nozzle (32), the bending element (41) being attached to the mounting projection (44). BE2016 / 0178 Waste end stretching device according to any one of claims 1 to 6, characterized in that the waste end stretcher (30) further includes a mounting body (31), the suction nozzle (32) being attached to or integrally formed with the mounting body (31), and the mounting body (31) adapted to be adaptable in position to be attached to a frame (2) of the weaving machine (11). The waste-end stretching device according to any one of claims 1 to 7, characterized in that the waste-end stretching device (30) further comprises a ring-jet device (33) for providing a suction force, preferably the ring-jet device (33) on the mounting body (31) and / or the suction nozzle (32) is attached. The waste-end stretching device according to any one of claims 1 to 8, characterized in that a guide element (40) is provided for guiding catching threads (12), the guide element (40) being positioned between the bending element (41) and the edge of the woven fabric (3). Waste-end stretching device according to claim 9, characterized in that the bending element (41) is formed integrally or as a structural unit with the guide element (40). Waste-end stretching device according to claim 9 or 10, characterized in that the guide element (40) comprises a cone-shaped, double-cone-shaped or hourglass-shaped intermediate element (42) which is arranged adjacent to the bending element (41), the intermediate element (42) being at least one conical first portion of increasing diameter in a direction away from the deflector element (41), and the smallest diameter of the BE2016 / 0178 first part is smaller than the diameter of the bending element (41). Waste-end stretching device according to claim 11, characterized in that the guide element (40) further comprises a ring (43) 5 disposed adjacent to the intermediate member (42) on one side away from the bending member (41), the ring (43) being rotatably mounted relative to the intermediate member (42) about an axis parallel to the weft insertion direction (29) . io The waste-end stretching device according to any one of claims 1 to 12, characterized in that the lateral suction slot (34) of the suction nozzle (32) is limited by a lower lip (38) and an upper lip (39), the waste-end stretcher (30) is adapted to be mounted on the weaving machine (11) with the lateral suction slot (34) extending close to and parallel to a support beam (20) of a weaving support (1) of the weaving machine (11), the lower lip (38) at least substantially at the level of the support beam (20) for guiding waste ends (28) through the support beam (20) and the lower lip (38) in the suction nozzle 20 (32) is provided. Weaving machine comprising a wide holder (23) along which wide holder (23) a fabric (3) is guided and a waste-end stretching device (30) according to any one of claims 1 to 13, wherein the waste end stretcher (30) includes a suction nozzle (32) adapted to apply a suction along the longitudinal direction (52) of the suction nozzle (32), the suction nozzle (32) stationary on the weaving machine ( 11) is arranged in an extension of the wide holder (23) in an axial 30 direction (53) of the wide holder (23) and with the longitudinal direction (52) of the suction nozzle (32) which is parallel to the BE2016 / 0178 weft insertion direction (29). Use of a waste-end stretching device according to any one of claims 1 to 13 in a weaving machine (11) containing a Waste-end stretching device according to claim 1, 2 or 3, characterized in that the first end wall (46) of the body of the suction nozzle (32) is stepped such that a lower part (50) of the first end wall (46) underneath the lateral suction slot (34) is positioned further away from the bending member (41) than an upper part (51) of the first end wall (46). Waste end stretching device according to any one of claims 1 to A wide holder (23) along which wide holder (23) a fabric (3) is guided, the waste-end stretching device (30) a suction nozzle (32) adapted to exert a suction force along the longitudinal direction (52) of the suction nozzle (32) ), the suction nozzle (32) being mounted stationary on the weaving machine (11) in an extension of the wide holder (23) in an axial direction (53) of the wide holder (23) and with the longitudinal direction (52) of the suction nozzle (32) which extends parallel to the weft insertion direction (29). ^BE2 ° 16 / O ₁₇₈ VISIT / O ¹⁷⁸ σι UT BE2016 / 0178 BE2016 / 0178 un 62016Ό ¹⁷⁸ BE2016 / 0178 BE2016 / 0178 BE2016 / 0178 Waste-end stretching device for a weaving machine. Waste-end stretching device for a weaving machine with a suction nozzle (32) provided with a lateral suction slot (34) extending along the longitudinal direction (52) of the suction nozzle (32) for vacuuming waste ends (28) and with an opening (35) provided at a first end of the suction nozzle (32) facing the edge of the woven fabric (3) for transferring waste ends (28) held in the suction nozzle (32) in a direction perpendicular to the longitudinal direction (52 ) of the suction nozzle (32), and wherein a bending element (41) is provided between the opening (35) and the edge of the woven fabric (3), which bending element (41) protrudes at least partially beyond the opening (35) for bending waste ends (28) held in the suction nozzle (32) in their trajectory between the edge of the woven fabric (3) and the opening (35). A weaving machine with such a waste end stretcher (30), and the use of such a waste end stretcher (30).