WO2019244068A1 - Giver rapier head - Google Patents

Giver rapier head Download PDF

Info

Publication number
WO2019244068A1
WO2019244068A1 PCT/IB2019/055160 IB2019055160W WO2019244068A1 WO 2019244068 A1 WO2019244068 A1 WO 2019244068A1 IB 2019055160 W IB2019055160 W IB 2019055160W WO 2019244068 A1 WO2019244068 A1 WO 2019244068A1
Authority
WO
WIPO (PCT)
Prior art keywords
rapier head
head
giver
giver rapier
housing
Prior art date
Application number
PCT/IB2019/055160
Other languages
French (fr)
Inventor
Brecht Halsberghe
Peter Garnett
Koen Bruynoghe
Original Assignee
Vandewiele Nv
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vandewiele Nv filed Critical Vandewiele Nv
Publication of WO2019244068A1 publication Critical patent/WO2019244068A1/en

Links

Classifications

    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/12Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/20Constructional features of the thread-engaging device on the inserters
    • D03D47/23Thread grippers
    • D03D47/233Carrying grippers

Definitions

  • the present invention relates to a giver rapier head for inserting a weft thread in a rapier weaving machine, comprising a housing, which delimits a receiving cavity, for the partial insertion therein of a corresponding receiver rapier head, wherein, on the head side of the giver rapier head, this receiving cavity leads into an access opening to this receiving cavity, for insertion of the receiver rapier head along here.
  • the present invention further relates to a set of a giver rapier head of this kind and a corresponding receiver rapier head.
  • the present invention relates to a rapier weaving machine comprising said set of a giver rapier head and a receiver rapier head.
  • the present invention further relates to a method for adapting a rapier weaving machine to a rapier weaving machine of this kind.
  • front indicates the side that is directed towards the fabric side of a fabric to be woven with this weaving machine.
  • the head side of a rapier head denotes the side which, during an inward movement of the rapier head, is directed forwards for inserting a weft thread in the fabric.
  • the tail side of a rapier head denotes the side that is directed backwards during this inward movement.
  • the invention relates to a giver rapier head for weaving machines that operate according to the principle of divided rapiers. More specifically the invention relates to a giver rapier head in which the receiver rapier head is partly taken up in order to pass a weft thread between these rapier heads.
  • Giver rapier heads of this kind are known for example from GB 1 487 897 and US 7,128,098. By catching the receiver rapier head in the giver rapier head, there is an increased chance of successful transfer of the weft thread.
  • rapier weaving machines rapiers are mounted on both sides of the looms for inserting the weft threads in a shed between warp threads.
  • the giver rapier head can be fastened to a flexible drive tape or to a rigid drive rod, together forming a giver rapier.
  • a corresponding receiver rapier head is provided on a flexible drive tape or a rigid drive rod, forming a receiving rapier.
  • the complete insertion cycle is divided into three phases: the feed phase, the insertion phase and the pull-through phase. During the feed phase, a weft thread is supplied to a giver rapier head.
  • the rapier heads move together on the forward path, from a starting position, in the shed towards the centre of the fabric.
  • the rapier heads move from the centre to the starting position.
  • the weft thread that is supplied to the giver rapier head is carried by this giver rapier head into the shed.
  • the weft thread is taken up by a receiver rapier head and during the backward movement (pull-through phase) the weft thread is pulled by this receiver rapier head through the shed from the centre of the fabric to the fabric edge.
  • the shape and structure of existing giver rapier heads is typically adapted to the manner of supplying the weft thread.
  • the aim of the present invention is to provide a giver rapier head wherein the possibilities for supplying a weft thread are increased.
  • a giver rapier head for inserting a weft thread in a rapier weaving machine, comprising a housing, which delimits a receiving cavity, for the partial insertion therein of a corresponding receiver rapier head, wherein this receiving cavity leads on the head side of the giver rapier head into an access opening to this receiving cavity for taking up the receiver rapier head along here and wherein the housing, at least viewed in a projection on a horizontal plane, gradually becomes wider towards the access opening of the giver rapier head.
  • This gradual widening preferably does not comprise any narrowings towards the access opening.
  • this housing also does not comprise any abrupt projections, on which or behind which warp threads could be caught, so that breakage of warp threads is avoided as far as possible. It is also possible to have pieces with an almost identical diameter towards this access opening. Preferably, in this projection on a horizontal plane, there is a continuous increase in the cross-section of the housing towards the access opening.
  • the receiving cavity also preferably gradually gets wider towards the access opening, viewed in a projection on a horizontal plane, so that corresponding deviations in the movement of the giver rapier head and the corresponding receiver rapier head relative to each other can easily be taken up. The receiver rapier head can then be caught in the giver rapier head with greater certainty.
  • the housing preferably gradually becomes narrower towards the front of the giver rapier head.
  • This gradual narrowing preferably does not comprise any widenings towards the front of the giver rapier head.
  • this housing also does not comprise any abrupt projections, on which or behind which warp threads could be caught. It is also possible to have pieces with an almost identical width towards this front. In this projection on a vertical plane, viewed transversely to the direction of motion for insertion of the weft thread, there is preferably, however, a continuous decrease in width of the housing towards the front.
  • the receiving cavity preferably also gradually becomes narrower towards the front, viewed in a projection on a vertical plane that extends transversely to the direction of motion for insertion of the weft thread. This signifies that the receiving cavity is provided towards the rear with a corresponding widening, so that corresponding deviations in the movement of the giver rapier head and the corresponding receiver rapier head relative to each other can easily be taken up. The receiver rapier head can then be caught with greater certainty in the giver rapier head.
  • the housing preferably becomes wider towards the access opening of the giver rapier head.
  • the housing also does not comprise any abrupt projections in this direction, on which or behind which warp threads could be caught. It is also possible to have pieces with an almost identical diameter towards the access opening. However, in this projection on a vertical plane there is preferably a continuous increase in the cross-section of the housing towards the access opening.
  • the receiving cavity also preferably gradually gets wider towards the access opening, viewed in this projection on a vertical plane, so that corresponding deviations in the movement of the giver rapier head and the corresponding receiver rapier head relative to each other can easily be taken up. The receiver rapier head can then be caught with greater certainty in the giver rapier head.
  • the housing of a giver rapier head comprises an insertion cavity for inserting the weft thread therein.
  • This insertion cavity preferably extends through the housing from the upper side to the underside of this housing and is opened towards the head side of the giver rapier head.
  • the giver rapier head then preferably comprises a guide nose and, on the upper side and/or on the underside, a guide bow between the insertion cavity and the guide nose to guide a weft thread towards the insertion cavity so that this weft thread can engage in this insertion cavity behind the guide nose.
  • this guide nose is preferably mounted as the first component and, viewed from the front of the giver rapier head, is also preferably mounted as the first component.
  • the housing is then also preferably provided on the rear with at least one guide element for guiding the weft thread towards the insertion cavity.
  • one guide element is provided, with a guide nose and, on the upper side and/or underside, a guide bow between the insertion cavity and the guide nose.
  • the housing may for example also comprise a first said guide element on the rear of the housing that is mounted on the underside of this housing and comprise a second said guide element on the rear of the housing that is mounted on the upper side of this housing.
  • the insertion cavity is preferably mounted closer to the rear of the giver rapier head than to the front thereof.
  • the housing of a giver rapier head according to the present invention is preferably mainly of symmetrical construction, relative to a horizontal plane, in order to increase the chance that the receiver rapier head can be caught in the giver rapier head.
  • the receiving cavity is also preferably of mainly symmetrical construction relative to a horizontal plane.
  • the housing of a giver rapier head according to the present invention leads, at least viewed in a projection on a horizontal plane, preferably on the head side of the giver rapier head, to a point, in order to allow the giver rapier head to adapt as well as possible to the shape of the shed.
  • the rapier can be led through the warp threads via a larger guide surface.
  • the giver rapier head then not only has the function of guiding warp threads in such a way that breakage thereof is avoided. The motion of this giver rapier head may conversely also be better supported through these warp threads.
  • the giver rapier head preferably has a mainly V-shape towards this point.
  • the shape of the housing of a giver rapier head of this kind preferably resembles the shape of the mouth of a basking shark. This shape not only allows good guidance towards the outside, but the shape of the feed cavity also matches the shape of the housing, so that on the inside as well, there is a good chance of catching the receiver rapier head smoothly in the feed cavity.
  • An especially preferred embodiment of a giver rapier head according to the present invention comprises at least one spring element that is mounted in the receiving cavity for catching the receiver rapier head, so that the receiver rapier head can be taken up smoothly in this receiving cavity.
  • This spring element absorbs forces that may arise when the receiver rapier head strikes against the giver rapier head.
  • two spring elements are mounted in the receiving cavity for catching the receiver rapier head between the two spring elements.
  • One of these spring elements is then preferably mounted at the front of the receiving cavity, whereas the other one of the two spring elements is mounted at the rear of the receiving cavity.
  • a spring element of this kind may be configured as a leaf spring, which may for example be made of polyamide or of spring steel.
  • the housing of a giver rapier head according to the present invention may advantageously be 3D printed. It may for example be printed from titanium.
  • the aim of the present invention is achieved by providing a set of a giver rapier head according to the present invention described above and a corresponding receiver rapier head, which can fit partly in the receiving cavity of this giver rapier head.
  • the receiver rapier head is preferably taken up, on the head side thereof, completely in the giver rapier head, wherein only the tail side of the receiver rapier head remains outside the giver rapier head.
  • the receiver rapier head is enclosed over a certain length of its head side by the housing of the giver rapier head during transfer, the chance of successful pick-up of the weft thread by the receiver rapier head is increased.
  • the aim of the present invention is achieved by providing a rapier weaving machine that comprises said set of a giver rapier head and a receiver rapier head according to the present invention.
  • This rapier weaving machine may be a rapier weaving machine with one or more of such sets.
  • the aim of the present invention is also achieved by providing a method for adapting a rapier weaving machine, wherein the giver rapier head is replaced with a giver rapier head according to the present invention as described above. Moreover, it is also possible to replace the receiver rapier head from this weaving machine with a receiver rapier head corresponding to this giver rapier head.
  • Fig. 1 shows a first embodiment of a giver rapier head according to the present invention in a bottom view
  • Fig. 2 shows the giver rapier head from Fig. 1 in a rear view
  • Fig. 3 shows the giver rapier head from Fig. 1 in a top view
  • Fig. 4 shows the giver rapier head from Fig. 1 in a front view
  • Fig. 5 shows the giver rapier head from Fig. 1 in perspective, with views on the upper side, the rear and the head side thereof;
  • Fig. 6 shows a second embodiment of a giver rapier head according to the present invention in a bottom view;
  • Fig. 7 shows the giver rapier head from Fig. 6 in a rear view
  • Fig. 8 shows the giver rapier head from Fig. 6 in a top view
  • Fig. 9 shows the giver rapier head from Fig. 6 in a front view
  • Fig. 10 shows the giver rapier head from Fig. 6 in perspective, with views on the upper side, the rear and the head side thereof;
  • Fig. 11 shows the giver rapier head from Fig. 1 in perspective, with views on the upper side, the front and the head side thereof;
  • Fig. 12 shows the giver rapier head from Fig. 1 in perspective, with views on the underside, the rear and the head side thereof;
  • Fig. 13 shows the giver rapier head from Fig. 6 in perspective, with views on the upper side, the front and the head side thereof;
  • Fig. 14 shows the giver rapier head from Fig. 6 in perspective, with views on the underside, the rear and the head side thereof;
  • Fig. 15 shows, in perspective, a set of the giver rapier head from Fig. 1 with a corresponding receiver rapier head fitted therein, with views on the upper side, the rear and the head side of the giver rapier head;
  • Fig. 16 shows the set from Fig. 15 in perspective, in horizontal section
  • Fig. 17 shows, in perspective, a set of the giver rapier head from Fig. 6 with a corresponding receiver rapier head fitted therein, with views on the upper side, the rear and the head side of the giver rapier head;
  • Fig. 18 shows the set from Fig. 17 in perspective, in horizontal section
  • Fig. 19 shows the set from Fig. 15 in front view
  • Fig. 20 shows the set from Fig. 15 in a horizontal longitudinal section
  • Fig. 21 shows the set from Fig. 15 in top view
  • Fig. 22 shows the set from Fig. 17 in front view
  • Fig. 23 shows the set from Fig. 17 in a horizontal longitudinal section
  • Fig. 24 shows the set from Fig. 17 in top view
  • Fig. 25 shows, in a top view of a giver rapier head from Fig. 1, the region for vertical presentation of weft threads;
  • Fig. 26 shows, in a top view of a giver rapier head from Fig. 6, the region for vertical presentation of weft threads
  • Fig. 27 shows, in a head view of a giver rapier head from Fig. 1, the region for vertical presentation of weft threads;
  • Fig. 28 shows, in a head view of a giver rapier head from Fig. 6, the region for vertical presentation of weft threads;
  • Fig. 29 shows, in a head view of a giver rapier head from Fig. 1, the region for diagonal presentation of weft threads;
  • Fig. 30 shows, in a head view of a giver rapier head from Fig. 6, the region for vertical and diagonal presentation of weft threads.
  • Both embodiments shown, of a giver rapier head (1) comprise a hollow, mainly tubular, housing (3).
  • the housing (3) delimits a receiving cavity (4), for the partial insertion therein of a receiver rapier head (2), as can be seen in Figs. 15-24.
  • An access opening (5) to this receiving cavity (4) is provided on the head side.
  • the giver rapier head (1) On the tail side, the giver rapier head (1) is provided, for attachment thereof to a rapier bar.
  • the housing (3) is also opened on the head side towards the rear, as can be seen in Figs. 2, 5, 12 and 15.
  • This housing (3) may in each case be made by 3D printing thereof in titanium.
  • the housing (3) is provided with an insertion cavity (6) for inserting the weft thread therein.
  • This insertion cavity (6) extends through the housing (3) from the upper side to the underside.
  • a clamp (17) is fitted on the underside for clamping the weft thread during insertion thereof in the insertion cavity (6).
  • This clamp (17) is spring mounted, as is known, by means of a spiral spring (15), as can be seen in Figs. 16, 18, 20 and 23.
  • This clamp (17) and this spiral spring (15) may for example be made of steel.
  • the spring tension can be adjusted with a set screw (16).
  • the shape of the housing (3) is adapted so as to be able to present weft threads to the giver rapier head (1) over a wide region, wherein these weft threads are led within this region to the insertion cavity (6).
  • This region is shown in Figs. 25-30. This is shown in Figs. 25-28 for weft threads presented vertically, and in Figs. 29 and 30 for weft threads presented diagonally.
  • the housing (3) gradually gets wider towards the access opening (5) of the giver rapier head, as can be seen in Figs. 1, 3, 6, 8, 20, 21, 23, 24, 25 and 26.
  • the housing (3) gradually gets narrower towards the front of the giver rapier head (1), as can be seen in Figs. 27-30.
  • the housing (3) gradually gets wider towards the access opening (5) of the giver rapier head, as can be seen in Figs. 2, 4, 7, 9, 19 and 22.
  • a guide nose (7) is fitted as the first component of the giver rapier head (1).
  • a guide bow (8) is fitted around the housing (3) both on the upper side and on the underside of the giver rapier head (1).
  • the insertion cavity (6) is mounted closer to the rear of the giver rapier head (1) than to the front thereof.
  • a guide element (11, 12) is provided on the rear of the housing (3) on both sides thereof for guiding weft threads towards the insertion cavity (6).
  • a single guide element (13, 14) is provided on this rear with a guide nose (13) fitted centrally, and on both sides of this guide nose (13) there is a guide bow (14) towards the insertion cavity (6).
  • This guide nose (13) and guide bows (14) ensure that in the second embodiment, the possibilities for weft presentation are further increased relative to the first embodiment, as can be seen in Figs. 29 and 30.
  • the giver rapier heads (1) are of substantially symmetrical construction relative to a horizontal plane.
  • they may be of somewhat less symmetrical construction, to adapt them to the shape of the upper shed on the one hand and the lower shed on the other hand.
  • this shape is preferably made as symmetrical as possible relative to a horizontal plane in order to increase the chance of catching the receiver rapier head (2) in the giver rapier head (1).
  • leaf springs (9, 10) are fitted in the receiving cavity (4), between which the receiver rapier head (2) can be caught and channeled, as can be seen in Figs. 20 and 23.
  • these leaf springs (9, 10) fan out relative to each other towards the head side of the giver rapier head (1).
  • These leaf springs (9, 10) may for example be made of polyamide or of spring steel.
  • a receiver rapier head (2) is shown that can be fitted with part on the head side thereof.
  • the receiver rapier head (2) comprises a spring-mounted hook element (18) which is spring-mounted with a spring (20), the spring force of which can be adjusted with a set screw (21).
  • the hook element (18) can be opened against this spring force by pushing on a push button (19).
  • this push button (19) is fitted on the rear of the receiver rapier head (2) and is integrated in or under the sliding block (19) of this receiver rapier head (2).
  • This sliding block just like the sliding block (22) of the giver rapier head (1), ensures guidance and accurate positioning of the rapier heads in the horizontal plane by the reed coming forward at the moment of transfer. In this way, more space is left on the front of the receiver rapier head (2) for guiding this receiver rapier head (2) during its travel, so that the receiver rapier head (2) can be made thinner and narrower on its head side. By making this receiver rapier head (2) thinner and narrower on the head side, it can be caught and channeled with greater certainty in the giver rapier head (1) between the leaf springs (9, 10).

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Abstract

The present invention relates to a giver rapier head (1) for inserting a weft thread in a rapier weaving machine, comprising a housing (3), which delimits a receiving cavity (4), for the partial insertion therein of a corresponding receiver rapier head (2), wherein this receiving cavity (4) leads on the head side of the giver rapier head (1) into an access opening (5) to this receiving cavity (4) for taking up the receiver rapier head (2) along here, and wherein the housing (3), viewed at least in a projection on a horizontal plane, gradually becomes wider towards the access opening (5) of the giver rapier head (1). Furthermore, the present invention also relates to a set of a giver rapier head of this kind (1) and a corresponding receiver rapier head (2), a weaving machine comprising a set of this kind and a method for adapting a weaving machine to a weaving machine of this kind.

Description

GIVER RAPIER HEAD
The present invention relates to a giver rapier head for inserting a weft thread in a rapier weaving machine, comprising a housing, which delimits a receiving cavity, for the partial insertion therein of a corresponding receiver rapier head, wherein, on the head side of the giver rapier head, this receiving cavity leads into an access opening to this receiving cavity, for insertion of the receiver rapier head along here. The present invention further relates to a set of a giver rapier head of this kind and a corresponding receiver rapier head.
Furthermore, the present invention relates to a rapier weaving machine comprising said set of a giver rapier head and a receiver rapier head.
The present invention further relates to a method for adapting a rapier weaving machine to a rapier weaving machine of this kind.
Whenever the terms front, rear, upper side, underside, horizontal and vertical are used in this text, these terms are seen relative to the parts in question, when these are installed in a weaving machine. Moreover, "front" indicates the side that is directed towards the fabric side of a fabric to be woven with this weaving machine.
The head side of a rapier head denotes the side which, during an inward movement of the rapier head, is directed forwards for inserting a weft thread in the fabric. The tail side of a rapier head denotes the side that is directed backwards during this inward movement.
The invention relates to a giver rapier head for weaving machines that operate according to the principle of divided rapiers. More specifically the invention relates to a giver rapier head in which the receiver rapier head is partly taken up in order to pass a weft thread between these rapier heads. Giver rapier heads of this kind are known for example from GB 1 487 897 and US 7,128,098. By catching the receiver rapier head in the giver rapier head, there is an increased chance of successful transfer of the weft thread.
With these weaving machines, called rapier weaving machines, rapiers are mounted on both sides of the looms for inserting the weft threads in a shed between warp threads. For this purpose the giver rapier head can be fastened to a flexible drive tape or to a rigid drive rod, together forming a giver rapier. Similarly, a corresponding receiver rapier head is provided on a flexible drive tape or a rigid drive rod, forming a receiving rapier. The complete insertion cycle is divided into three phases: the feed phase, the insertion phase and the pull-through phase. During the feed phase, a weft thread is supplied to a giver rapier head. During the insertion phase, the rapier heads move together on the forward path, from a starting position, in the shed towards the centre of the fabric. On the backward path (pull-through phase), the rapier heads move from the centre to the starting position. In the starting position, the weft thread that is supplied to the giver rapier head is carried by this giver rapier head into the shed. At the centre of the fabric, during transfer, the weft thread is taken up by a receiver rapier head and during the backward movement (pull-through phase) the weft thread is pulled by this receiver rapier head through the shed from the centre of the fabric to the fabric edge.
The shape and structure of existing giver rapier heads is typically adapted to the manner of supplying the weft thread.
The aim of the present invention is to provide a giver rapier head wherein the possibilities for supplying a weft thread are increased.
This aim of the invention is achieved by providing a giver rapier head for inserting a weft thread in a rapier weaving machine, comprising a housing, which delimits a receiving cavity, for the partial insertion therein of a corresponding receiver rapier head, wherein this receiving cavity leads on the head side of the giver rapier head into an access opening to this receiving cavity for taking up the receiver rapier head along here and wherein the housing, at least viewed in a projection on a horizontal plane, gradually becomes wider towards the access opening of the giver rapier head.
Owing to this widening, with vertical presentation of a weft thread there is a large increase in the possibilities for supplying this weft thread. Therefore, with one and the same giver rapier head, a larger selection of weft presenting means is possible.
This gradual widening preferably does not comprise any narrowings towards the access opening. This means that this housing also does not comprise any abrupt projections, on which or behind which warp threads could be caught, so that breakage of warp threads is avoided as far as possible. It is also possible to have pieces with an almost identical diameter towards this access opening. Preferably, in this projection on a horizontal plane, there is a continuous increase in the cross-section of the housing towards the access opening.
Within said housing, the receiving cavity also preferably gradually gets wider towards the access opening, viewed in a projection on a horizontal plane, so that corresponding deviations in the movement of the giver rapier head and the corresponding receiver rapier head relative to each other can easily be taken up. The receiver rapier head can then be caught in the giver rapier head with greater certainty.
Viewed in a projection on a vertical plane, which extends transversely to the direction of motion for insertion of the weft thread, the housing preferably gradually becomes narrower towards the front of the giver rapier head.
By making the housing narrower, viewed in this projection, towards the front of the giver rapier head, this while always ensuring that the receiver rapier head can partly be taken up in this giver rapier head, said giver rapier head is being adapted to the shape of the shed. This gives rise to a wider guide surface as the rapier is led through the warp threads that form the shed.
Owing to this narrowing, the possibilities for diagonal presentation of the weft thread are greatly increased. Relative to comparable machines with rapier heads according to the prior art, this offers greater possibilities for adjustments of presenting means for weft presentation. It is then also possible to mount more components of a weaving machine fixedly, for example such as weft scissors and/or weft presenting means and/or weft thread guiding means, for a further increase in weaving speeds. Adapting the giver rapier head to the shape of the shed also ensures that one and the same giver rapier head can be used more widely for different machines.
This gradual narrowing preferably does not comprise any widenings towards the front of the giver rapier head. This means that this housing also does not comprise any abrupt projections, on which or behind which warp threads could be caught. It is also possible to have pieces with an almost identical width towards this front. In this projection on a vertical plane, viewed transversely to the direction of motion for insertion of the weft thread, there is preferably, however, a continuous decrease in width of the housing towards the front.
Within said housing, the receiving cavity preferably also gradually becomes narrower towards the front, viewed in a projection on a vertical plane that extends transversely to the direction of motion for insertion of the weft thread. This signifies that the receiving cavity is provided towards the rear with a corresponding widening, so that corresponding deviations in the movement of the giver rapier head and the corresponding receiver rapier head relative to each other can easily be taken up. The receiver rapier head can then be caught with greater certainty in the giver rapier head.
Viewed in a projection on a vertical plane that extends along the direction of motion for insertion of the weft thread, the housing preferably becomes wider towards the access opening of the giver rapier head.
This widening is preferably gradual, so that the housing also does not comprise any abrupt projections in this direction, on which or behind which warp threads could be caught. It is also possible to have pieces with an almost identical diameter towards the access opening. However, in this projection on a vertical plane there is preferably a continuous increase in the cross-section of the housing towards the access opening.
Within said housing, the receiving cavity also preferably gradually gets wider towards the access opening, viewed in this projection on a vertical plane, so that corresponding deviations in the movement of the giver rapier head and the corresponding receiver rapier head relative to each other can easily be taken up. The receiver rapier head can then be caught with greater certainty in the giver rapier head.
In a specific embodiment, the housing of a giver rapier head comprises an insertion cavity for inserting the weft thread therein. This insertion cavity preferably extends through the housing from the upper side to the underside of this housing and is opened towards the head side of the giver rapier head.
The giver rapier head then preferably comprises a guide nose and, on the upper side and/or on the underside, a guide bow between the insertion cavity and the guide nose to guide a weft thread towards the insertion cavity so that this weft thread can engage in this insertion cavity behind the guide nose.
Viewed from the head side of the giver rapier head, this guide nose is preferably mounted as the first component and, viewed from the front of the giver rapier head, is also preferably mounted as the first component.
With this arrangement of the guide nose, and owing to the guide bow on the upper side and/or on the underside of the giver rapier head, there is an increased chance that the weft thread can be caught in the insertion cavity.
Furthermore, the housing is then also preferably provided on the rear with at least one guide element for guiding the weft thread towards the insertion cavity. Preferably, one guide element is provided, with a guide nose and, on the upper side and/or underside, a guide bow between the insertion cavity and the guide nose. Alternatively the housing may for example also comprise a first said guide element on the rear of the housing that is mounted on the underside of this housing and comprise a second said guide element on the rear of the housing that is mounted on the upper side of this housing. The insertion cavity is preferably mounted closer to the rear of the giver rapier head than to the front thereof.
The housing of a giver rapier head according to the present invention is preferably mainly of symmetrical construction, relative to a horizontal plane, in order to increase the chance that the receiver rapier head can be caught in the giver rapier head. The receiving cavity is also preferably of mainly symmetrical construction relative to a horizontal plane.
The housing of a giver rapier head according to the present invention leads, at least viewed in a projection on a horizontal plane, preferably on the head side of the giver rapier head, to a point, in order to allow the giver rapier head to adapt as well as possible to the shape of the shed. By allowing the giver rapier head to take on the shape of the shed, the rapier can be led through the warp threads via a larger guide surface. The giver rapier head then not only has the function of guiding warp threads in such a way that breakage thereof is avoided. The motion of this giver rapier head may conversely also be better supported through these warp threads.
Viewed in this projection, the giver rapier head preferably has a mainly V-shape towards this point. The shape of the housing of a giver rapier head of this kind preferably resembles the shape of the mouth of a basking shark. This shape not only allows good guidance towards the outside, but the shape of the feed cavity also matches the shape of the housing, so that on the inside as well, there is a good chance of catching the receiver rapier head smoothly in the feed cavity.
An especially preferred embodiment of a giver rapier head according to the present invention comprises at least one spring element that is mounted in the receiving cavity for catching the receiver rapier head, so that the receiver rapier head can be taken up smoothly in this receiving cavity. This spring element absorbs forces that may arise when the receiver rapier head strikes against the giver rapier head.
Preferably, two spring elements are mounted in the receiving cavity for catching the receiver rapier head between the two spring elements. One of these spring elements is then preferably mounted at the front of the receiving cavity, whereas the other one of the two spring elements is mounted at the rear of the receiving cavity.
It is also possible to fit more than two spring elements, spaced around the receiving cavity, between which the receiver rapier head can be caught.
These one or more spring elements are preferably mounted in the giver rapier head in such a way that these also channel the receiver rapier head in the receiving cavity. More specifically, a spring element of this kind may be configured as a leaf spring, which may for example be made of polyamide or of spring steel.
The housing of a giver rapier head according to the present invention may advantageously be 3D printed. It may for example be printed from titanium.
Furthermore, the aim of the present invention is achieved by providing a set of a giver rapier head according to the present invention described above and a corresponding receiver rapier head, which can fit partly in the receiving cavity of this giver rapier head.
For fitting the receiver rapier head partly in the giver rapier head, the receiver rapier head is preferably taken up, on the head side thereof, completely in the giver rapier head, wherein only the tail side of the receiver rapier head remains outside the giver rapier head.
Because the receiver rapier head is enclosed over a certain length of its head side by the housing of the giver rapier head during transfer, the chance of successful pick-up of the weft thread by the receiver rapier head is increased.
Furthermore, the aim of the present invention is achieved by providing a rapier weaving machine that comprises said set of a giver rapier head and a receiver rapier head according to the present invention. This rapier weaving machine may be a rapier weaving machine with one or more of such sets.
Finally, the aim of the present invention is also achieved by providing a method for adapting a rapier weaving machine, wherein the giver rapier head is replaced with a giver rapier head according to the present invention as described above. Moreover, it is also possible to replace the receiver rapier head from this weaving machine with a receiver rapier head corresponding to this giver rapier head.
The present invention is now explained in more detail on the basis of the detailed description given hereunder of individual embodiments of a giver rapier head, a set of a giver rapier head and a receiver rapier head, a rapier weaving machine and a method according to the present invention. The purpose of this description is exclusively to give explanatory examples and to point out further advantages and particular features of the invention, and thus should not be interpreted as a limitation of the field of application of the invention or of the patent rights claimed in the claims.
In this detailed description, reference is made by means of reference numbers to the appended drawings, wherein
- Fig. 1 shows a first embodiment of a giver rapier head according to the present invention in a bottom view;
- Fig. 2 shows the giver rapier head from Fig. 1 in a rear view;
- Fig. 3 shows the giver rapier head from Fig. 1 in a top view;
- Fig. 4 shows the giver rapier head from Fig. 1 in a front view;
- Fig. 5 shows the giver rapier head from Fig. 1 in perspective, with views on the upper side, the rear and the head side thereof; Fig. 6 shows a second embodiment of a giver rapier head according to the present invention in a bottom view;
Fig. 7 shows the giver rapier head from Fig. 6 in a rear view;
Fig. 8 shows the giver rapier head from Fig. 6 in a top view;
Fig. 9 shows the giver rapier head from Fig. 6 in a front view;
Fig. 10 shows the giver rapier head from Fig. 6 in perspective, with views on the upper side, the rear and the head side thereof;
Fig. 11 shows the giver rapier head from Fig. 1 in perspective, with views on the upper side, the front and the head side thereof;
Fig. 12 shows the giver rapier head from Fig. 1 in perspective, with views on the underside, the rear and the head side thereof;
Fig. 13 shows the giver rapier head from Fig. 6 in perspective, with views on the upper side, the front and the head side thereof;
Fig. 14 shows the giver rapier head from Fig. 6 in perspective, with views on the underside, the rear and the head side thereof;
Fig. 15 shows, in perspective, a set of the giver rapier head from Fig. 1 with a corresponding receiver rapier head fitted therein, with views on the upper side, the rear and the head side of the giver rapier head;
Fig. 16 shows the set from Fig. 15 in perspective, in horizontal section;
Fig. 17 shows, in perspective, a set of the giver rapier head from Fig. 6 with a corresponding receiver rapier head fitted therein, with views on the upper side, the rear and the head side of the giver rapier head;
Fig. 18 shows the set from Fig. 17 in perspective, in horizontal section;
Fig. 19 shows the set from Fig. 15 in front view;
Fig. 20 shows the set from Fig. 15 in a horizontal longitudinal section;
Fig. 21 shows the set from Fig. 15 in top view;
Fig. 22 shows the set from Fig. 17 in front view;
Fig. 23 shows the set from Fig. 17 in a horizontal longitudinal section;
Fig. 24 shows the set from Fig. 17 in top view;
Fig. 25 shows, in a top view of a giver rapier head from Fig. 1, the region for vertical presentation of weft threads;
Fig. 26 shows, in a top view of a giver rapier head from Fig. 6, the region for vertical presentation of weft threads; Fig. 27 shows, in a head view of a giver rapier head from Fig. 1, the region for vertical presentation of weft threads;
Fig. 28 shows, in a head view of a giver rapier head from Fig. 6, the region for vertical presentation of weft threads;
Fig. 29 shows, in a head view of a giver rapier head from Fig. 1, the region for diagonal presentation of weft threads;
Fig. 30 shows, in a head view of a giver rapier head from Fig. 6, the region for vertical and diagonal presentation of weft threads. Both embodiments shown, of a giver rapier head (1), comprise a hollow, mainly tubular, housing (3).
The housing (3) delimits a receiving cavity (4), for the partial insertion therein of a receiver rapier head (2), as can be seen in Figs. 15-24. An access opening (5) to this receiving cavity (4) is provided on the head side.
Distributed over the housing (3), perforations are provided, to make the giver rapier head (1) as light as possible.
On the tail side, the giver rapier head (1) is provided, for attachment thereof to a rapier bar.
In the first embodiment, the housing (3) is also opened on the head side towards the rear, as can be seen in Figs. 2, 5, 12 and 15.
This housing (3) may in each case be made by 3D printing thereof in titanium.
The housing (3) is provided with an insertion cavity (6) for inserting the weft thread therein. This insertion cavity (6) extends through the housing (3) from the upper side to the underside. In the receiving cavity (4), a clamp (17) is fitted on the underside for clamping the weft thread during insertion thereof in the insertion cavity (6). This clamp (17) is spring mounted, as is known, by means of a spiral spring (15), as can be seen in Figs. 16, 18, 20 and 23. This clamp (17) and this spiral spring (15) may for example be made of steel. The spring tension can be adjusted with a set screw (16).
The shape of the housing (3) is adapted so as to be able to present weft threads to the giver rapier head (1) over a wide region, wherein these weft threads are led within this region to the insertion cavity (6). This region is shown in Figs. 25-30. This is shown in Figs. 25-28 for weft threads presented vertically, and in Figs. 29 and 30 for weft threads presented diagonally.
Viewed in a projection on a horizontal plane, the housing (3) gradually gets wider towards the access opening (5) of the giver rapier head, as can be seen in Figs. 1, 3, 6, 8, 20, 21, 23, 24, 25 and 26.
Viewed in a projection on a vertical plane that extends, viewed transversely, to the direction of motion for insertion of the weft thread, the housing (3) gradually gets narrower towards the front of the giver rapier head (1), as can be seen in Figs. 27-30. Viewed in a projection on a vertical plane that extends along the direction of motion for insertion of the weft thread, the housing (3) gradually gets wider towards the access opening (5) of the giver rapier head, as can be seen in Figs. 2, 4, 7, 9, 19 and 22. Viewed from the head side of the giver rapier head (1) and viewed from the front of the giver rapier head (1), a guide nose (7) is fitted as the first component of the giver rapier head (1). Between this guide nose (7) and the insertion cavity (6), a guide bow (8) is fitted around the housing (3) both on the upper side and on the underside of the giver rapier head (1).
In both embodiments, the insertion cavity (6) is mounted closer to the rear of the giver rapier head (1) than to the front thereof.
In the first embodiment, a guide element (11, 12) is provided on the rear of the housing (3) on both sides thereof for guiding weft threads towards the insertion cavity (6).
In the second embodiment, a single guide element (13, 14) is provided on this rear with a guide nose (13) fitted centrally, and on both sides of this guide nose (13) there is a guide bow (14) towards the insertion cavity (6). This guide nose (13) and guide bows (14) ensure that in the second embodiment, the possibilities for weft presentation are further increased relative to the first embodiment, as can be seen in Figs. 29 and 30.
As can be seen in Figs. 27-30, the giver rapier heads (1) are of substantially symmetrical construction relative to a horizontal plane. In the case of giver rapier heads (1) for two-piece weaving machines, they may be of somewhat less symmetrical construction, to adapt them to the shape of the upper shed on the one hand and the lower shed on the other hand. However, here too this shape is preferably made as symmetrical as possible relative to a horizontal plane in order to increase the chance of catching the receiver rapier head (2) in the giver rapier head (1). In both embodiments, leaf springs (9, 10) are fitted in the receiving cavity (4), between which the receiver rapier head (2) can be caught and channeled, as can be seen in Figs. 20 and 23. For this purpose, these leaf springs (9, 10) fan out relative to each other towards the head side of the giver rapier head (1). These leaf springs (9, 10) may for example be made of polyamide or of spring steel.
In both giver rapier heads (1) shown, a receiver rapier head (2) is shown that can be fitted with part on the head side thereof. Of course, it is also possible to provide other receiver rapier heads that are not shown, partially fitting therein. When the receiver rapier head (2) is withdrawn from the feed cavity (4), it takes with it a weft thread that has been inserted in the insertion cavity (6). For this purpose the receiver rapier head (2) comprises a spring-mounted hook element (18) which is spring-mounted with a spring (20), the spring force of which can be adjusted with a set screw (21). The hook element (18) can be opened against this spring force by pushing on a push button (19). Here, this push button (19) is fitted on the rear of the receiver rapier head (2) and is integrated in or under the sliding block (19) of this receiver rapier head (2). This sliding block, just like the sliding block (22) of the giver rapier head (1), ensures guidance and accurate positioning of the rapier heads in the horizontal plane by the reed coming forward at the moment of transfer. In this way, more space is left on the front of the receiver rapier head (2) for guiding this receiver rapier head (2) during its travel, so that the receiver rapier head (2) can be made thinner and narrower on its head side. By making this receiver rapier head (2) thinner and narrower on the head side, it can be caught and channeled with greater certainty in the giver rapier head (1) between the leaf springs (9, 10).

Claims

1. Giver rapier head (1) for inserting a weft thread in a rapier weaving machine, comprising a housing (3), which delimits a receiving cavity (4), for the partial insertion therein of a corresponding receiver rapier head (2), wherein this receiving cavity (4) leads on the head side of the giver rapier head (1) into an access opening (5) to this receiving cavity (4) for taking up the receiver rapier head (2) along here, characterized in that the housing (3), at least viewed in a projection on a horizontal plane, gradually becomes wider towards the access opening (5) of the giver rapier head (1).
2. Giver rapier head (1) according to Claim 1, characterized in that the housing (3), viewed in a projection on a vertical plane that extends transversely to the direction of motion for insertion of the weft thread, gradually becomes narrower towards the front of the giver rapier head (1).
3. Giver rapier head (1) according to one of the preceding claims, characterized in that the housing (3) and the receiving cavity (4) viewed in a projection on a vertical plane that extends along the direction of motion for insertion of the weft thread, gets wider towards the access opening (5) of the giver rapier head (1).
4. Giver rapier head (1) according to one of the preceding claims, characterized in that the housing (3) comprises an insertion cavity (6) for inserting the weft thread therein, comprises a guide nose (7) on the head side of the giver rapier head (1), and on the upper side and/or on the underside comprises a guide bow (8) between the insertion cavity (6) and the guide nose (7).
5. Giver rapier head (1) according to Claim 4, characterized in that the guide nose (7), viewed from the head side of the giver rapier head (1), is mounted as the first component, and viewed from the front of the giver rapier head (1) is mounted as the first component.
6. Giver rapier head (1) according to Claim 4 or 5, characterized in that the housing (3) is provided on the rear with at least one guide element (11, 12, 13, 14) for guiding the weft thread towards the insertion cavity (6).
7. Giver rapier head (1) according to Claim 6, characterized in that the guide element (11, 12, 13, 14) comprises a guide nose (13) on the rear of the housing (3) and, on the upper side and/or on the underside, comprises a guide bow (14) between the insertion cavity (6) and this guide nose (13).
8. Giver rapier head (1) according to Claim 6, characterized in that the giver rapier head (1) comprises a first said guide element (11) on the rear of the housing (3) that is mounted on the underside of this housing (3) and comprises a second said guide element (12) on the rear of the housing (3) that is mounted on the upper side of this housing (3).
9. Giver rapier head (1) according to one of Claims 4 to 8, characterized in that the insertion cavity (6) is mounted closer to the rear of the giver rapier head (1) than to the front thereof.
10. Giver rapier head (1) according to one of the preceding claims, characterized in that the housing (3) is of mainly symmetrical construction relative to a horizontal plane.
11. Giver rapier head (1) according to one of the preceding claims, characterized in that the housing (3), at least viewed in a projection on a horizontal plane, leads on the head side of the giver rapier head (1) to a point.
12. Giver rapier head (1) according to one of the preceding claims, characterized in that this giver rapier head (1) comprises at least one spring element (9, 10) that is mounted in the receiving cavity (4) for receiving the receiver rapier head (2).
13. Giver rapier head (1) according to one of the preceding claims, characterized in that the housing (3) is 3D printed.
14. Set of a giver rapier head (1) and a receiver rapier head (2), characterized in that the giver rapier head (1) is a giver rapier head (1) according to one of the preceding claims and in that the receiver rapier head (2) can partly be received in the receiving cavity (4) of this giver rapier head (1).
15. Rapier weaving machine, characterized in that this rapier weaving machine comprises a set of a giver rapier head (1) and a receiver rapier head (2) according to
Claim 14.
16. Method for adapting a rapier weaving machine, characterized in that the giver rapier head (1) is replaced by a giver rapier head (1) according to one of Claims 1 to 13.
PCT/IB2019/055160 2018-06-21 2019-06-19 Giver rapier head WO2019244068A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BEBE-2018/5431 2018-06-21
BE20185431A BE1026412B1 (en) 2018-06-21 2018-06-21 VEGETABLE HEAD

Publications (1)

Publication Number Publication Date
WO2019244068A1 true WO2019244068A1 (en) 2019-12-26

Family

ID=62975789

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2019/055160 WO2019244068A1 (en) 2018-06-21 2019-06-19 Giver rapier head

Country Status (2)

Country Link
BE (1) BE1026412B1 (en)
WO (1) WO2019244068A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113293485A (en) * 2021-05-26 2021-08-24 绍兴市嘉纬电子科技有限公司 High-speed wear-resisting type weaving sword head
EP4101960A1 (en) * 2021-06-10 2022-12-14 Picanol Gripper for a rapier weaving machine
WO2022258443A1 (en) * 2021-06-10 2022-12-15 Picanol Gripper for a rapier weaving machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1487897A (en) 1975-09-29 1977-10-05 Et.Co.Ma Sarl Weft infeed and transfer apparatus
GB2018307A (en) * 1978-04-07 1979-10-17 Somet Soc Mec Tessile A weft-inserting gripper for a continuous weft feed loom
WO1997047792A1 (en) * 1996-06-07 1997-12-18 Picanol N.V. Transfer gripper for a rapier loom
US7128098B2 (en) 2002-09-20 2006-10-31 Picanol N.V. Transfer gripper for a rapier weaving loom

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1487897A (en) 1975-09-29 1977-10-05 Et.Co.Ma Sarl Weft infeed and transfer apparatus
GB2018307A (en) * 1978-04-07 1979-10-17 Somet Soc Mec Tessile A weft-inserting gripper for a continuous weft feed loom
WO1997047792A1 (en) * 1996-06-07 1997-12-18 Picanol N.V. Transfer gripper for a rapier loom
US7128098B2 (en) 2002-09-20 2006-10-31 Picanol N.V. Transfer gripper for a rapier weaving loom

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113293485A (en) * 2021-05-26 2021-08-24 绍兴市嘉纬电子科技有限公司 High-speed wear-resisting type weaving sword head
EP4101960A1 (en) * 2021-06-10 2022-12-14 Picanol Gripper for a rapier weaving machine
WO2022258443A1 (en) * 2021-06-10 2022-12-15 Picanol Gripper for a rapier weaving machine
BE1029428B1 (en) * 2021-06-10 2023-04-18 Picanol Nv Gripper for a lance weaving machine

Also Published As

Publication number Publication date
BE1026412B1 (en) 2020-01-30
BE1026412A1 (en) 2020-01-23

Similar Documents

Publication Publication Date Title
WO2019244068A1 (en) Giver rapier head
US9732450B2 (en) Giver rapier head, giver rapier, rapier weaving machine and method for inserting a weft thread in such a rapier weaving machine using such a giver rapier head
CN102016145A (en) Receiving gripper, feed gripper and device for a gripper weaving machine
US20090293983A1 (en) Apparatus And Method For The Insertion Of A Weft Thread In A Rapier Weaving Machine
JPH0345747A (en) Gripper loom with rapier guide
US4116243A (en) Jet loom
JP2683722B2 (en) Gripper loom
CS249521B2 (en) Weaving machine
US3779288A (en) Weft carrier guide
JPH09316752A (en) Delivering gripper for gripper loom
BE1021782B1 (en) THREADER, GRAIN WEAVING MACHINE AND METHOD FOR INSERTING AN IMPRESSION THREAD WITH SUCH A GRAINER IN SUCH A GRAIN WEAVING MACHINE
US3986532A (en) Weft extending carrier
BRPI0711869A2 (en) process and device for forming a fabric edge in a catcher weaving machine
US20080178959A1 (en) Catching apparatus and method for a rapier weaving machine
EP3014004B1 (en) Method and device for inserting two weft threads at the same time
US4147187A (en) Shuttle
US3960186A (en) Weft yarn control device
US2447291A (en) Thread separator for weft replenishing looms
EP1052318A1 (en) Device for weft cancellation on a weaving machine
US2324564A (en) Nose board for axminster looms
BE1021814B1 (en) THREADER HEAD, THREADER, GRAIN WEAVE MACHINE AND METHOD FOR INSERTING AN IMPRESSION THREAD WITH SUCH A GRAINER HEAD IN SUCH A GRAYER WEAVING MACHINE
CN109642362B (en) Device and method for catching and stretching weft threads
US635198A (en) Apparatus for weaving fabrics.
WO2021006017A1 (en) Loom
JP6348016B2 (en) Weft control device for air jet loom

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19739716

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19739716

Country of ref document: EP

Kind code of ref document: A1