EP1799896B1 - Guide element for a gripping transport element of a loom - Google Patents

Abstract

Guidance surfaces (14-18) of the guidance component (10), and its open enclosure (13) are associated with a shuttle transport rail (19). The open enclosure (13) has a projection (41) matching a long groove in the underside of the rail (19). At the open side, a further projection (20) has an upper surface (40) forming a guide for the rail. This (40) is below the upper edge (42) of the projection (41). The projection is a peak directed away from the enclosure. The upper edge (43) of the projection (20), which serves as a guide, runs to the guide (14) on the underside of the shuttle carrier (19). Below the projection (20) a rounded edge transitions with milled surfaces into side flanks of the guide component. The guide component has a region (12) for penetration into a shed. This has a flat, plate-like form, with its thickness decreasing toward the open side. The guide component has a rounded upper edge (23). The highest point (24) of this edge is located in the region above the open side of the enclosure. The upper edge includes an obtuse angle near the highest point. The section running from the highest point of the upper edge to the open side of the enclosure, is at about 45[deg] to the guide surfaces of the guide section lying opposite. Further details and variations of the guidance sections are provided.

Description

The invention relates to a guide element for a gripper conveyor element of a weaving machine, which has guides which form a positive, open to one side enclosure for the gripper transport element.

As gripper conveyor elements gripper bars or gripper bands are provided, which are introduced from one side of the loom forth in a shed. A gripper transport member moves a gripper which has picked up a weft thread, either to the opposite side of the shed, where the weft thread is taken over by a transfer element. Or the gripper conveyor moves with the gripper and the weft yarn to about the middle of the shed, where it also accommodates a transfer gripper also transported by a gripper transport element, which picks up the inserted weft thread and then transports it out of the shed onto the other side of the shed , Or the gripper conveyor moves with a gripper, a gripper grab, through the shed and picks up a weft, which is then pulled through the shed. The gripper conveyor elements are guided within the shed by means of guide elements which are attached to the sley. They carry out the weaving movement, whereby they penetrate from below into a warp sheet when the reed is moved from the edge of the fabric. They then move out of the shed through the lower warp thread and out again when the newly inserted weft thread is struck by the reed at the edge of the fabric.

There are hook-shaped guide elements, known ( EP 02 75 479 B1 ) whose open side faces the reed. They serve in particular for guiding a gripper conveyor element designed as a rapier band. They have a guide associated with the upper side of the gripper transport element and an opposite guide assigned to the underside of the gripper transport element. Another guide is provided for a side surface of the gripper conveyor belt on the side facing away from the open side. The lower and / or upper guide engage in a longitudinal groove of the bottom and / or the top of the rapier, the sides of the guides, which are facing away from the open side, secure the gripper band against dodging towards the open side. These guides, which are to avoid dodging of the rapier band toward the open side, are relatively small. As a result, on the guide elements and also on the gripper transport elements occurs in a relatively short time considerable wear.

There are also known C-shaped guide elements ( WO 94/10364 ), which are also open to the reed. The gripper transport element, which can also be a flexible rapier band here, is guided on the open side of the guide elements by means of two opposing sections of guides which prevent deflection in the horizontal direction towards the reed. The top and the bottom of the gripper transport element keep a distance to the opposite areas of the guide elements, so that they are not out. The gripper transporting member has a portion extending through the open side of the guide members, which is guided vertically between the opposite portions of the guides. In this type of construction, too, only guides with relatively small guide surfaces are present in particular in the direction of the reed, so that rapid wear is to be expected.

There are further guided tours known ( EP 07 15 009 A1 ), which support a rapier band only on the underside and thereby engage in a longitudinal groove of the underside of the rapier band. The gripper belt and the gripper are only secured by gravity against lifting up. It is to be expected that such guide elements are not sufficient at very high weaving speeds, since the gripping tapes lift off and / or tend to buckle.

Furthermore, guiding means are known ( EP 0 726 342 A1 ) having a guide member which supports a rapier band or a guide part of a gripper and which has an upper part which enters between warp threads.

The invention has for its object to provide guide elements of the type mentioned, which improve the guiding of the gripper conveyor elements.

This object is achieved by a guide element having the features of claim 1.

Since the enclosure encloses the gripper transport element with guides, which are also assigned to the top and the bottom of the gripper transport element, resulting in relatively large guides without the dimensions must be increased. It is even possible to reduce the cross-sections of the gripper conveyor elements, without requiring the guides and guide surfaces must be reduced. Smaller cross-sections lead to lower masses and allow therefore higher web speeds. Of particular advantage is the protruding from the enclosure to the open side approach. On the one hand, this approach forms a support for a part of the gripper transport element which is outside the enclosure, so that it can be supported against torsional forces. In addition, the approach reduces the risk of trapping warp threads in the guide elements, which could result in damage to the warp yarns and / or warp yarn breaks.

In an advantageous embodiment of the invention it is provided that the approach is designed in the manner of a facing away from the border away tip. This tip can be inserted between two warp threads, which have already been pushed apart from the upper edge of the guide elements easily.

In a further embodiment of the invention it is provided that the upper edge of the guide elements has a highest point, which is located in the area above the open side of the enclosure. The upper edge of the guide elements first strikes the warp sheet and pushes the warp threads slightly apart. The approach lies in the "shadow" of the top edge, so that it easily penetrates between the warp threads, which have already been pushed apart a bit. The risk that warp threads are caught is therefore significantly reduced. Likewise, the risk is reduced that warp threads come into contact with the guides for the gripper transport element.

Fig. 1

zeigt eine perspektivische Ansicht eines erfindungsgemäßen Führungselementes,

Fig. 2

eine perspektivische Ansicht des Führungselementes nach Fig. 1 von der anderen Seite,

Fig. 3

eine schematische Seitenansicht des Führungselementes nach Fig. 1 und 2 mit einem darin geführten Greifertransportelement,

Fig. 4

eine Ansicht des Führungselementes nach Fig. 1 bis 3 mit ei- nem an anderer Stelle geschnittenen Greifertransportelement,

Fig. 5

eine schematische Ansicht einer weiteren Ausführungsform eines Führungselements mit einem geschnittenen Greifer- transportelement,

Fig. 6

das Führungselement nach Fig. 5 mit einem abgewandelten Greifertransportelement,

Fig. 7

eine perspektivische Ansicht auf eine weitere Ausführungsform eines Führungselementes,

Fig. 8

eine perspektivische Ansicht auf das Führungselement der Fig. 7 von der gegenüberliegenden Seite,

Fig. 9

eine schematische Ansicht des Führungselementes nach Fig. 7 und 8 mit einem Schnitt durch ein Greifertransportelement,

Fig. 10

die Ansicht des Führungselementes nach Fig. 7 bis 9 mit einem an anderer Stelle geschnittenen Greifertransportelements

Fig. 11 bis 13

weitere Ausführungsformen von erfindungsgemäßen Führungs- elementen,

Fig. 13 bis 17

Ausführungsformen von nicht erfindungsgemäßen Führungs- elementen, und

Fig. 18

eine weitere Ausführungsform eines erfindungsgemäßen Füh- rungselements.

Further features and advantages of the invention will become apparent from the following description of the embodiments illustrated in the drawings and the dependent claims.

Fig. 1

shows a perspective view of a guide element according to the invention,

Fig. 2

a perspective view of the guide element according to Fig. 1 from the other side,

Fig. 3

a schematic side view of the guide element according to Fig. 1 and 2 with a gripper transport element guided therein,

Fig. 4

a view of the guide element after Fig. 1 to 3 with a gripper transport element cut elsewhere,

Fig. 5

1 is a schematic view of a further embodiment of a guide element with a cut gripper transport element,

Fig. 6

the guide element after Fig. 5 with a modified gripper transport element,

Fig. 7

a perspective view of a further embodiment of a guide element,

Fig. 8

a perspective view of the guide element of Fig. 7 from the opposite side,

Fig. 9

a schematic view of the guide element according to FIGS. 7 and 8 with a section through a gripper transport element,

Fig. 10

the view of the guide element after Fig. 7 to 9 with a gripper conveyor element cut elsewhere

Fig. 11 to 13

further embodiments of guide elements according to the invention,

FIGS. 13 to 17

Embodiments of non-inventive guide elements, and

Fig. 18

a further embodiment of a guide element according to the invention.

In the Fig. 1 to 18 shown guide elements are similar to that in the EP 0576854 A1 is shown attached to a sley, which also receives a reed. The batten performs reciprocating movements to strike a weft thread to the edge of the fabric. The guide elements are brought into a shed through the lower warp thread when the reed in the is the rearmost position and a weft thread is entered. To hit the weft, the batten moves with the reed towards the edge of the fabric, wherein the guide elements, after the gripper transport member has been withdrawn, again move out of the shed through the lower warp sheet. In the drawings, only the position is shown in which the reed is in the most backward position and in which a gripper transport element is inserted into a shed. When the terms "up" and "down" are used, they refer to this position.

This in Fig. 1 to 4 Guide element 10 shown has a fastening part 11 with which it is attached to a sley or an intermediate profile in a row one behind the other with the same guide elements. Above the fastening part 11 is the region 12 of the guide element, which is intended to penetrate into a shed. In this region 12, the guide element has guides 14, 15, 16, 17 and 18, which form a gripper transport element 19 (FIG. 3 and 4 ) engage or enclose, so that the totality of the guides 14, 15, 16, 17, 18 is called a border for the gripper transport element 19. The enclosure 13 is on one side, ie on the side facing a reed, not shown, open. The guide 14 is assigned to the underside of the gripper transport element 19.

The guide 15 guides the gripper transport element 19 on the side facing away from the open side, ie against movements from the open side. The guide 16 is assigned to the upper side of the gripper transport element 19 and prevents deflection of the gripper transport element 19 upwards. The guides 17 and 18 are side edges of projections 40, 41 which protrude from the guide 16 associated with the top or from the guide 14 associated with the bottom and leave an open gap between them. The guide 18 runs substantially parallel to the guide 15. The guide 17 extends at an angle of about 45 ° to the guide 16. The upper, located in the region of the open side of the enclosure 13 edge of the gripper conveyor element 19 is formed correspondingly oblique. The gripper transport element 19 is advantageously guided in this way in all directions by the guide elements 10.

Of the lower projection 41 of the guide member 10 projects a projection 20 outwardly from the enclosure 13 away, the upper edge 43 is equal to the guide 14, which is associated with the underside of the gripper conveyor element 19. The upper edge 43 is lower than the upper edge 42 of the projection 41. The gripper transport element 19 has a widening 21 extending over at least part of its length (FIG. Fig. 4 ) with a length of eg 500 mm, which remains outside of the receptacle 13 and which serves to receive a gripper. The gripper transport element 19 may be a gripper belt that is relatively flexible about a horizontal axis, or a gripper bar that is relatively rigid about both a horizontal axis and a vertical axis. The broadening 21 may be integrally formed on the gripper transport element 19. In a modified embodiment, it is provided that on the gripper conveyor element 19, a guide member is attached, which complements and / or replaces the gripper conveyor element 19 over part of its length and has the widening 21 and carries the gripper. The projection 20 supports with its serving as a guide upper edge 43, the underside of the gripper conveyor element in the area of spreading 21, so that torsional forces can be absorbed.

The guide element 10 has an overall approximately plate-like shape and is attached to a sley so that the flat sides are substantially parallel to warp threads. As in particular from Fig. 1 and 2 it can be seen that is intended to penetrate into a shed Area 12 of the guide elements 10 is processed so that it tapers in the direction of the open side to the projection 20, which forms a kind of tip. From this slightly rounded tip of the lug 20 extends a side edge 22 in the manner of a groove to the fastening part 11, which is rounded. The side edge 22 is chamfered and merges into the flanks of the region 12. Due to the tapered shape, the guide 15 is relatively wide and in this embodiment has an almost constant width. In a modified embodiment, the guide 15 has an approximately trapezoidal shape. The guide 14, however, tapers towards the open sides and has an approximate trapezoidal shape. The same applies to the guide 16 and the guide 17. The projection 41 with the guide 18 has a rounded upper edge 42 and chamfered, upwardly tapering side surfaces, which merge into the flanks of the area 12. The region 12 has an upper edge 23 which is rounded. The adjoining the upper edge 23 surfaces are chamfered that they extend to the guides 16, 17 obliquely to the flanks of the region 12.

How out 3 and 4 can be seen, the upper edge 23 has a highest point 24, which lies in the region of the open side of the receptacle This highest point 24 is the point at which the guide elements 10 first penetrate into a warp sheet while spreading apart the warp threads. The warp threads then slide on the inclined surfaces which adjoin the upper edge 23. They are already spread relatively far when the projection 41 and the projection 20 come into their area. Since the projection 20 lies below the upper edge 42 of the projection 41 and is preferably formed as a tip, it will penetrate between the already spread apart warp threads. Since the projection 41 tapers upwards and lies below the projection 40, it is covered by this. The projection 41 can therefore easily penetrate between already spread apart warp threads.

Since the projection 20 and in particular its upper edge 43 are deeper than the projection 40, and the projection 20 can penetrate between already by the projection 41 and the projection 40 spread apart warp threads without damaging them. The projection 20 is shielded by the projections 40 and 41, so that it does not catch warp threads which extend obliquely to the other warp threads. This ensures that no warp threads remain on the upper edge 43 of the projection 20, which could then be taken away by the gripper conveyor element and torn or damaged. A particularly good spreading apart of warp threads is obtained when the guide member 10 is made in the region of the guide 15 is relatively wide.

As in particular from Fig. 1 and 2 it can be seen, all edges of the thread guide elements 10, which could come into contact with threads and / or the gripper transport element, rounded. Also lying behind the guide 15, facing away from the open side outer edge is rounded and chamfered large area.

The embodiments according to FIGS. 5 and 6 correspond in principle to the embodiment according to Fig. 1 to 4 but with the guides facing each other in pairs and one pair each perpendicular to the other pair. The guides 14, 16 guide the gripper conveyor element 19 against dodging in the vertical direction. The guides 15, 18 and 27 are parallel to each other and prevent deflection of the gripper conveyor element 19 in the horizontal direction.

The gripper transport element 19 of the Fig. 5 is provided with a widening 28 which is smaller in height than the height of the gripper transport element. In the embodiment according to Fig. 6 is provided that the outer sides of the guides 18 and 27 forming sections serve as guides 45, 46, the corresponding surfaces of the widening 29 of the gripper transport element 19 are opposite. As a result, a good support against possibly acting in the region of the widening 29 torsional forces is achieved.

At one opposite FIGS. 5 and 6 modified embodiment, it is provided that the upper edge of the guide elements is designed so that in the region of the open side a highest point similar to the highest point 24 of the embodiment according to Fig. 1 to 4 has, with which the guide elements first penetrate into a warp sheet.

The embodiment according to Fig. 7 to 10 corresponds in its basic structure of the embodiment according to Fig. 1 to 4 , so on the description for Fig. 1 to 4 Reference is made and the same reference numerals are used. In the embodiment according to Fig. 7 to 10 is additionally provided that of the bottom of the gripper transport member 19 associated guide 14, a projection 30 projects into the receptacle 13. This projection 30 forms additional side guides, which prevent deflection of the gripper transport element in the horizontal direction and in particular toward the open side. The enlargement of the guides serves to reduce the wear.

In the embodiment according to Fig. 11 which is essentially the embodiment of Fig. 1 to 4 corresponds, the upper edge 43 of the projection 20 is offset relative to the guide 14 down. This further reduces the risk that warp threads come into contact with the upper edge 43 of the projection 20, since the warp threads are spread apart by the projection 41 and the adjoining side surfaces of the guide element. The risk of damage to the warp threads is the smaller, the greater the distance between the upper edge 42 of the projection 41 and the upper edge 43 of the projection 20 is. The embodiment according to Fig. 12 differs from the embodiment according to Fig. 11 in that a projection 30 is provided which protrudes from the guide 14 and engages in a longitudinal groove of the gripper transport element 9.

In the embodiment according to Fig. 13 , which is largely according to the embodiment Fig. 11 corresponds, 19 is provided between the upper edge 42 of the projection 41 and the groove bottom of the longitudinal groove of the gripper transport element 19, a clearance or a game. This avoids that the relatively narrow upper edge in the areas of the groove bottom of the longitudinal groove of the gripper transport element generates increased wear. According to the embodiment Fig. 13 is also provided between the bottom 44 of the projection 40 of the guide member 10 and the groove bottom of a longitudinal groove of the gripper transport element 19, a distance or a game.

The gripper conveyor element 19 after Fig. 14 has a flat, rectangular cross section and is particularly suitable for use as a rapier band which can be guided around a drive wheel of a rapier loom by means of a guide block. The gripper transport element 19 is guided by means not guide elements 80 according to the invention , the guide 81 for the smooth, not by a groove odgl. have profiled top of the gripper transport element 19. The guide of the guide element 80 assigned to the underside of the gripper transport element is provided with a projection 41 which engages in a longitudinal groove of the gripper transport element 19. Also in this embodiment, a projection 20 is provided, the upper edge is lower than the upper edge of the projection 41 and thus shielded in the manner already described upon penetration into a warp thread.

The non-inventive embodiment according to Fig. 15 differs from the embodiment according to Fig. 14 in that a second projection 30 protrudes from the guide 88 assigned to the underside of the gripper transport element 19. The longitudinal grooves of the gripper transport element 19 and the projections 30, 41 are coordinated so that between the upper edges of the projections 30, 41 and the groove bottom of the longitudinal grooves of the gripper transport element 19 a game is present.

As based on Fig. 16 is shown, the upper edge 43 of the projection 20 does not have as in the embodiment according to Fig. 14 or 15 lower than the guide 88 lie. It is essential, however, that the upper edge 43 of the projection 20 is arranged lower than the upper edge 42 of the projection 41st

In the non-inventive embodiment according to Fig. 17 the projection 41 is held relatively wide in the direction of the width of the gripper transport element 19. The guide member 80 forms only with the upper edge of the projection 41 and the upper edge 43 of the projection 20 guides that prevent dodging of the gripper conveyor element in the downward direction. In the underside of the gripper conveyor element 19 subsequent to the side facing away from the open side of the guide element 80 side of the gripper conveyor element 19 associated guide 84 is left a game.

In Fig. 18 is a modified, inventive embodiment of the Fig. 17 shown, in which the upper side of the gripper conveyor element 19 is provided with a longitudinal groove, in which a projection 41 opposite projection 86 of the guide member 80 engages. Gripper transport element 19 is guided in the vertical direction only from the upper edge of the projection 41 and the lower edge of the projection 86. Following the guide 87 is between the top of the Gripper transport element and the guide member 80 a game 85 is provided.

The leadership forms after FIGS. 14 to 18 are particularly well suited to absorb torsional forces that can be introduced into the gripper transport element 19 due to the arrangement of a gripper, not shown, in particular during acceleration and deceleration.

In modified embodiments, it is provided that the projection 20 from the open side of the guide elements 10 or 80 away not designed as a tapered tip, but is provided with parallel surfaces. This configuration is particularly possible if the guide elements 10, 80 in the region of the guides 15, 87 are relatively wide and therefore warp threads are spread accordingly wide when the upper edge 43 of the projection 20 passes in the region of the warp threads.

The invention is not limited to the illustrated embodiments. In particular, it is possible to realize the features described for the individual embodiments in other embodiments. For example, it is also possible according to the embodiment Fig. 5 or 6 to provide a projection corresponding to the projection 30. It is also possible, according to the embodiments Fig. 1 to 4 or 7 to 10 to use other gripper conveyor elements, in particular gripper conveyor elements corresponding to the widenings 28 or 29 FIGS. 5 and 6 are provided. In further modified embodiments are in the region of the guide 16, which is associated with the top of the gripper transport element 19, one or more inwardly into the receptacle 13 projecting projections corresponding to the projection 30 of FIGS. 7 and 10 intended.

Claims (12)

1. Guide element (10, 80) for a gripper transport element (19) of a weaving machine comprising guides (14, 15, 16, 17, 18; 42, 87), forming a positive frame (13) for the gripper transport element, open on one side, wherein the frame (13) is provided with at least one projection (41), associated to a longitudinal groove of the lower side of the gripper transport element (19), which protrudes from a guide (14) of the frame (13) associated to the lower side of the gripper transport element (19), that the frame (13) at the open side adjoining the projection is provided with a shoulder (20), which is designed in form of a pike directed away from the frame (13) and whose upper edge (43) forms a guide for the gripper transport element (19), which is located below the upper edge (42) of the projection (41), and that a projection (40) protrudes from the guide (16) associated to the upper side of the gripper transport element (19), which faces the protruding projection (41) from the guide (14) associated to the lower side of the gripper transport element (19), wherein the projections (40, 41) leave a gap in between.
2. Guide element according to claim 1, characterised in that the upper edge (43) of the shoulder (20) serving as a guide runs as an elongation of a guide (14) associated to the lower side of the gripper transport element (19).
3. Guide element according to any one of claims 1 or 2, characterised in that below the shoulder (20) a rounded side edge is provided, which with chamfered surfaces transforms into the side flanks of the guide elements (10).
4. Guide element according to any one of claims 1 to 3, characterised in that the guide element (10) in its portion (12) meant for entering into a weaving shed has a flat, plate-shaped design and that its thickness reduces in the direction towards the open side.
5. Guide element according to any one of claims 1 to 4, characterised in that the guide element has a rounded upper edge (23).
6. Guide element according to claim 5, characterised in that the upper edge (23) of the guide element (10) has a highest point (24), which is located in the area above the open side of the inclusion (13).
7. Guide element according to any one of claims 1 to 6, characterised in that the upper edge (23) in the area of the highest point (24) encloses an obtuse angle.
8. Guide element according to any one of claims 1 to 7, characterised in that the section of the upper edge running from the highest point (24) of the upper edge (23) to the open side of the frame (13) runs with an angle of about 45° to the guide surface of the opposite guide section.
9. Guide element according to any one of claims 1 to 8, characterised in that the frame (13) has a guide (17), which runs at least approximately parallel to the inclined section of the upper edge (23), which runs from the highest point (24) towards the open side.
10. Guide element according to any one of claims 1 to 9, characterised in that the lower projection (41) limiting the gap with chamfered surfaces transforms into the side flanks of the guide elements.
11. Guide element according to any one of claims 1 to 10, characterised in that from a guide (14, 16) associated to the lower side and/or the upper side of the gripper transport element (19) a shoulder (30) protrudes into the inclusion (13), whose side surfaces are additional guides.
12. Guide element according to any one of claims 1 to 11, characterised in that the upper edge (43) of the shoulder (20) is displaced downwards with respect to a guide (14) associated to the lower side of the gripper transport element (19).

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