WO2005031054A1

WO2005031054A1 - Guiding element for a gripper strip

Info

Publication number: WO2005031054A1
Application number: PCT/EP2004/010573
Authority: WO
Inventors: Kristof Roelstraete; Denis Moeneclaey; Joost Carpentier
Original assignee: Picanol N.V.
Priority date: 2003-09-23
Filing date: 2004-09-21
Publication date: 2005-04-07
Also published as: ATE462032T1; CN1856609A; DE502004010941D1; EP1664411B1; DE10346225A1; EP1664411A1; CN1856609B

Abstract

The aim of the invention is to create an interlocking guide for a gripper strip (19) of a gripper weaving machine. To this end, a projection (32) is provided on the side of the guiding element which faces a weaving reed during the mounting thereof into a gripper weaving machine (14), said projection being radially oriented in relation to the axis of a batten and being the part of the guiding element (25) that protrudes the furthest in the radial direction.

Description

Description Guide element for a gripper belt

The invention relates to a guide element for a rapier belt of a rapier weaving machine, which has guide surfaces for the positive guidance of a rapier belt.

Such guide elements are attached in a row one behind the other on a sley of a rapier weaving machine in such a way that, due to the movement of the sley, they penetrate from below through the lower warp thread sheet into a shed. In the shed, they then form a guide for a gripper belt penetrating into the shed. At its free end, the looper belt carries a looper that introduces a weft thread into the shed. After the insertion of the weft thread, the gripper band is pulled back out of the shed, after which the sley swings back and the weft thread is struck against the fabric edge by means of a reed. During this pivoting back of the sley, the guide elements are moved out of the shed again through the lower warp thread sheet. To get high shooting speeds, i.e. To enable rapid successive weft entries, the movements overlap at least partially. The sley moves the guide elements out of the shed, while the shed forming elements already move the warp threads to form a new shed. The guide elements should neither catch and take warp threads with them when they move into the shed nor out of the shed, and of course also no weft threads.

Hook-shaped guide elements are known from EP 0275479 B1 which form a guide which is open to the reed and which are then arranged at the greatest possible distance from the reed. From Guide elements known from EP 0275479 B1 only allow relatively small lateral guide surfaces which limit a movement of the rapier band towards the reed. The gripper belts guided in this way are therefore exposed to relatively high wear.

From EP 0357974 B1 it is known to provide a gripper belt which is essentially rectangular in cross section on both sides with triangular notches running in the longitudinal direction. Tooth-like projections of guide elements, which are arranged in two rows, engage in these notches. The two rows of the guide elements have a distance corresponding to the width of the gripper belt. The size of the guide surfaces of the guide elements and the size of the guided surfaces of the gripper belt are relatively small.

From EP 0898000 B1 it is known to use guide elements in the form of two partial guide elements which are arranged in a row. A hook-shaped part guide element is assigned to the top of the gripper belt. Another part guide element is assigned to the underside of the gripper belt. The partial guide elements are arranged at a distance from one another in the direction of movement of the gripper belt, but they form a one-piece guide element. The successive guide elements are arranged such that a partial guide element assigned to the upper side of the gripper belt and a partial guide element assigned to the lower side of the gripper belt are arranged in a common plane running transversely to the direction of movement of the gripper belt.

Guide elements are also known (WO 94/10364) which form a C-shaped guide and have an opening on the side facing the reed which is delimited at the top and bottom by guide sections. These guide sections form hook-like parts on which Warp threads can get caught especially when moving the guide elements out of the shed.

The invention has for its object to provide a guide element of the type mentioned, which allows greater freedom in the design of the guide surfaces without increasing the risk that warp threads or weft threads when moving into and out of a shed on the Guide element get caught and can be taken away.

This object is achieved in that the guide element is provided with a projection which, when installed in a rapier weaving machine, is arranged on the side of the rapier belt facing a reed and is oriented essentially radially to the axis of rotation of a sley and which is a guide surface for a side surface of the Forms gripper belt, and that the guide element has a web - directed perpendicularly to this projection when viewed in the direction of movement of the gripper belt to be guided - which web ends at a distance from the projection and which forms at least one guide surface which is substantially perpendicular to that of the side surface associated guide surface of the projection.

The invention enables the guide elements to be provided with large guide surfaces for the rapier belt, in particular also with a large guide surface for the side surface of the rapier belt facing a reed during installation. Since the gripper belt is guided by means of large guide surfaces, it can safely absorb the torsional forces that occur during braking and acceleration. Since the web ends at a distance from the projection, a passage which is open in the direction of movement of the gripper belt and is open at the top remains, in which a part of the gripper belt or a fastening element for a gripper can move. In an advantageous embodiment of the invention, the projection - when installed in a rapier weaving machine - is the part that protrudes the most radially from the axis of the sley. In particular, if the projection and the web are arranged in the same plane transverse to the direction of movement of the gripper belt, there is an advantage. During weaving, the protrusion between two warp threads penetrates the shed. It spreads these warp threads so that the following web already finds an opening between the warp threads when it also penetrates the shed. Since the projection has no hook-like guides or parts, no warp threads can get caught on it during movements into the shed and out of the shed.

Further features and advantages of the invention result from the following description of the exemplary embodiments shown in the drawings.

1 shows a schematic representation of a rapier weaving machine,

2 shows a section along the line II-II of FIG. 1 on a larger scale,

3 to

14 views of differently designed guide elements according to the invention and cuts through different shapes of gripper belts,

Fig. 15

16, 17 views in the direction of arrow IX of FIG. 9 on gripper belts and different embodiments of guide elements, 18 shows a side view of a gripper belt with a guide part and a schematically illustrated gripper.

19 is a view of the closed side of a gripper belt consisting of at least two sections with different cross sections,

Fig. 20 is a section along the line XX - XX of Fig. 19 and

21 shows a section along the line XXI - XXI of FIG. 19.

The rapier weaving machine shown schematically in FIG. 1 has two side parts 10, 11 in which a sley 12 is mounted. The sley 12 is driven to a reciprocating movement by means of a drive 13 engaging at both ends. In one position, a reed 14 attached to the sley 12 strikes a weft thread inserted into a shed 15 (see FIG. 2) against the edge of a fabric 16.

A weft thread is drawn from a weft thread supply (not shown) by means of a rapier gripper 17, brought to the center of the weaving machine and taken over there by a take-up gripper 18 and pulled through the shed on the opposite side of the weaving machine. The bringer gripper 17 and the slave gripper 18 are each attached to the end of a gripper belt 19, 20. The two rapier belts 19, 20 are moved from the two machine sides into a shed 15 and pulled back again after the rapiers 17, 18 have met in the middle and the weft thread has been taken over. The gripper belts 19, 20 are flexible plastic strips, or the like, with inserts made of glass fibers, carbon fibers or aramid (Kevlar). are reinforced. The shapes of the gripper belts 19, 20 are will be explained in more detail later. The gripper belts 19, 20 are driven on both sides of the machine by means of drives 21, each of which has a drive wheel 22 around which the gripper belts 19, 20 are guided. The drive wheels 22 engage with teeth in recesses in the gripper belts 19, 20. The gripper belts 19, 20 are guided around the drive wheels 22 with guide blocks 23.

The two side parts 10, 1 1 contain stationary guides 24 which guide the gripper belts 19, 20 in the direction of the shed. The gripper belts 19, 20 which are moved to and fro in the direction of arrow A are guided within the shed by means of guide elements 25 which are moved into and out of the shed 15 by the sley 12.

As can be seen from FIG. 2, the sley 12 is arranged on a shaft 26 of the sley. The sley shaft 26 is driven to rotate back and forth in such a way that the reed 14 fastened to the sley 12 moves from the position shown to a stop position in which an inserted weft thread is struck against the edge of the fabric 16.

A support profile 27 is fastened to the sley 12, to which the guide elements 25 are attached by means of screws 28 in such a way that they lie one behind the other in a row in the direction of a weft thread to be inserted and form a guide for the looper band 19 which (in the exemplary embodiment 2) is provided with a gripper 17.

The shed 15 is formed in that shed forming means, not shown, divide the warp threads into a lower warp thread sheet 29 and an upper warp thread sheet 30 and move them down and up accordingly. After entering a weft thread, the reed 14 struck on the fabric 16. In addition, the shed 15 is changed, for which purpose warp threads of the lower warp thread sheet 29 are moved up and warp threads of the upper warp thread sheet 30 are moved down before the next weft insertion takes place. With the pivoting of the sley, the guide elements 25 move on a circular path indicated by a dash-dotted line 31 about the axis of rotation of the sley shaft 26. As indicated by the position 25 ′ shown in dashed lines, they move relative to the lower warp thread sheet 29 by in to penetrate the shed 15 and move out again.

The guide elements 25 are provided on the side of the rapier belt 19 facing the reed 14 in the installed state with a projection 32 which is oriented essentially radially to the axis of rotation of the shutter shaft 26 and which is the part of the guide element 25 which is the farthest in the radial direction protrudes from the axis of rotation of the shutter shaft 26 and comes closest to the reed 14. The projection 32 thus penetrates the lower warp thread sheet 29 first and leaves it last. The guide element 25 also has a web 33 which is oriented essentially perpendicular to the projection 32 and is set back in the radial direction with respect to the end of the projection 32. The web 33 ends in front of the projection 32 at a distance. This distance and the extent to which the projection 32 projects radially beyond the web 33 are coordinated with one another in such a way that no warp threads can get into the space between the web 33 and the projection 32 if the guide element is relative to the lower warp thread family 29 emotional. Because of the distance between the end of the web 33 and the guide surface 35 of the projection 32, there is a free area or passage that is open at the top and in which a transverse web of the gripper belt 19 can run. In the embodiment according to FIGS. 2 and 3, the gripper belt 19 has a U-shaped cross section. It is provided with a longitudinal groove which is open towards one side surface and in which the gripper belt 19 is guided in a vertical direction by the web 33. The top and bottom of the web 33 are designed as guide surfaces. Below the underside of the web 33, the guide element has a guide surface 34 which is assigned to a side surface of the rapier belt 19 which faces away from the reed 14. Opposite the guide surface 34 there is a further guide surface 35, which is the inner surface of the projection 32. The gripper to be attached to the gripper belt 19, that is to say a bringer gripper 17 or a slave gripper 18, can be attached to the part of the gripper belt 19 located above the web 33 of the guide element 25 at any point, which can be chosen so that when accelerating and braking the Gripper belt torsional moments as low as possible occur. A rapier gripper 17 or a slave gripper 18 can be located above the projection 32 and also partially in the area between a reed 14 and the projection. It is also possible to guide part of a bringer gripper on the surface of the projection 32 opposite the guide surface 35 (FIG. 13).

The guide elements 25 are relatively thin metal plates. In order to facilitate penetration into the lower warp thread family 29, the end of the projection 32 is sharpened in a knife-like manner. Accordingly, at least the top of the web 33 is sharpened in a cutting-like manner so that it does not lose its function as a guide surface. The end of the projection 32 can also be designed in the form of a needle tip. The top of the web 33 is in the shadow of the projection 32 when penetrating into the lower warp thread sheet 29 and can therefore easily penetrate through the lower warp thread sheet 29 into the shed 15. 4 shows that the guide element according to FIGS. 2 and 3 can also be used in the same form for a gripper belt 36 which has a flat, rectangular cross section. In this case, the underside of the essentially rectangular, upwardly open recess serves as a guide surface 37, which lies opposite the underside of the web 33. In this case, bringer gripper 17 or a slave gripper 18 is attached in the region of the gripper belt between the end of the web 33 and the projection 32. For this purpose, a fastening element 59 is then provided, which connects the grippers to the gripper belt 36. Since the web 33 ends at a distance from the projection 32, there is a free passage for the fastening element 59. The gripper belt 36 is guided on its entire underside and over the entire height of both side surfaces. Only in the vicinity of the projection 32 is a relatively narrow strip of the gripper belt 36 not guided. This creates very large guide areas. Since the web 33 is relatively long transversely to the gripper belt 36 and extends close to the projection 32, torsional forces can be absorbed well. It is advantageous if the length of the web 33 is approximately 2/3 of the width of the gripper belt 36.

5, a longitudinal groove is machined into the underside of the gripper belt 38. The underside of the recess of the guide element 39 is graduated accordingly. As a result, the guide surfaces effective in the horizontal direction can be enlarged.

FIG. 6 shows a guide element 25a which essentially corresponds to the guide element 25 of FIG. 3. In addition, upper and lower guide ribs 40 are provided in the region of the lateral guide surface 35, which additionally stabilize the gripper belt 19. The embodiments according to FIGS. 7 and 8 are also modifications according to the embodiment according to FIG. 3. The guide elements 25b or 25c are provided below the side guide surfaces for the gripper belt 19 with shoulders 41 or 42, which additionally support the gripper belt 19. Of course, it is also possible to provide a shoulder 41 and 42 both for the guide surface 34 and for the guide surface 35. It is also possible to assemble a guide from guide elements 25, 25a and 25b and 25c, ie from guide elements that are not identical to one another.

9 and 10 guide elements 43 are shown, which consist of two partial guide elements 45, 46. The partial guide element 45 has a web 33a which is aligned substantially perpendicular to a projection 49 and ends at a distance from this. The web 33a forms with its underside a guide surface for the upper side of a gripper band 36, which has a substantially rectangular cross section. The partial guide element 45 further has a guide surface 53, which runs essentially perpendicular to the underside of the web 33a, for the side surface of the gripper band 36, which is the reed is turned away. The partial guide element 46 is provided with the projection 49, which forms a guide surface 54 for the side surface of the gripper belt facing the reed. This guide surface 54 is adjoined by a guide surface of the partial guide element 46 which runs perpendicular thereto and which is assigned to the underside of the gripper belt 36. The guide surface of the partial guide element 46 assigned to the underside of the gripper belt 36 does not extend over the entire width of the gripper belt 36.

The exemplary embodiment according to FIG. 10 corresponds in principle to the exemplary embodiment according to FIG. 9. The partial guide element 45 is provided with a web 33b, the underside of which guides the upper side of the gripper belt 36. The top of the web 33b is curved. The curvature runs approximately concentrically to the axis of rotation of the sley, not shown, to which the guide elements 43 are attached. The partial guide element 46 has a guide surface for the underside of the gripper belt 36, which extends over the full width of the gripper belt. The projection 55 of the partial guide element 46 is shorter than in the previously described embodiments and ends approximately on the radius of curvature of the upper side of the web 33b.

The partial guide elements 45, 46 according to FIG. 9 or 10 can be individual components which are each attached to a profile 27 of a sley 12 by means of screws 28 (FIG. 2). According to FIG. 15, it is provided that the partial guide elements 45, 46 are designed as one component by means of a common bar 58. The partial guide elements 45 and 46 are arranged at a distance from one another in the longitudinal direction of the gripper belt 36. In the embodiment according to FIG. 17, the common strips 58a are designed such that the adjacent guide elements 43 can be arranged such that the partial guide elements 45 and 46 of the adjacent guide elements 43 each lie in a common plane running transversely to the longitudinal direction of the gripper belt 36 as shown in FIG. 17. It is also readily possible to design the fastening means 61 of the partial guide elements 45, 46 such that, although they are individual components, they can be arranged in a common transverse plane, as is shown in FIG. 16.

11 and 12, guide elements 44 formed from partial guide elements 47, 48 are shown, which are used for the form-fitting guidance of a rapier belt 19, which is provided with a longitudinal groove 23 open to the side surface facing away from the reed 14. The partial guide element 47 has a web 33c which engages in this longitudinal groove 23 and takes over the guiding of the gripper belt in the direction of its upper side and its lower side. The part guide element 48 is with provided with a projection 51 which forms a guide surface 54 for the side surface of the rapier belt 19 which faces the reed. The guidance in the opposite direction can take place through the front end of the web 33c and the base of the longitudinal groove and / or by means of a guide surface of the partial guide element 47 which connects to the underside of the web 33c. In the exemplary embodiment according to FIG. 11, the projection 51 of the partial guide element 48 projects far beyond the web 33c in the radial direction to the axis of rotation of the sley. In contrast, in the exemplary embodiment according to FIG. 12, the projection 56 is shortened.

In the exemplary embodiments according to FIGS. 11 and 12, the partial guide elements 47, 48 can be a component with a similar design according to FIG. 15 or 17 or two separate components which are attached together or independently of one another by means of fastening means 61.

11 and 12 can be used for gripper belts 19 which are provided with a longitudinal groove 23. If a partial guide element 48 is used, which only provides a guide surface 54 for a side surface of the gripper belt by means of the projection 51, then a guide surface for the underside of a gripper belt 36 with a rectangular cross section must be provided on the partial guide element 47a (FIG. 13). 13 and 14 by means of a second web 57 protruding from the partial guide element 47a in the direction of the projection 51. As shown in FIGS. 13 and 14, in the case of such a partial guide element 47a a gripper belt 19 with a Longitudinal groove 23 or a gripper belt 36 with a rectangular cross section can be used.

The web of the guide elements can have a profile that is adapted to a profile of the longitudinal groove of the gripper belt 19, so that 19 lateral managers can also be applied inside the longitudinal groove of the gripper belt. In the exemplary embodiment according to FIG. 13, it is provided that the web 50 of the guide element 44a has a wedge-shaped shape which widens towards the base of the longitudinal groove 23a.

As shown in FIG. 13, the gripper 17 can be guided on the projection 51 of the partial guide element 48, which for this purpose is provided with a guide groove 63 on the side facing away from the gripper belt 19 (or 36).

In all embodiments, it is expediently provided that roundings or bevels are provided between adjoining surfaces of the gripper belts 19 or 36 and the guide surfaces of the guide elements. The guide according to the invention is of course also suitable for rapier weaving machines, in which only one rapier belt is provided which, with its rapier, transports the weft thread over the entire width of the shed from one side to the other side of the rapier weaving machine.

In some cases it is advisable to provide the gripper belts 19 or 36 with an exchangeable guide part 60 at their front end, which is provided with the gripper 17 or 18, as shown in FIG. 18. The gripper 17 or 18 is fastened both to the front end of the gripper belt 19 or 36 and to the guide part 60. The guide part 60 has a cross-sectional shape that corresponds to the cross-sectional shape of the gripper belt 19 or 36.

In the exemplary embodiment according to FIGS. 19 to 21, guide elements 25 corresponding to FIGS. 2 and 3 are provided, which guide a gripper belt 71 which has two successive sections with different cross sections. In the front section (Fig. 20), in the area richly arranged a gripper 18, the gripper belt has the cross section described with reference to FIG. 2, which has an increased rigidity. In this area it has a longitudinal groove 23 which also serves as a guide. In the subsequent section, which may be more flexible, it only has the lower leg of the U-shaped cross section, ie somewhat less than half the cross section of the previous section. This more flexible section is guided on the top of its underside and on both side surfaces. Instead of two sections with different cross sections, three or more sections can also be provided, which become more flexible as the distance from the gripper increases.

Claims

claims

Guide element for guiding a rapier belt of a rapier weaving machine, which has guide surfaces for positively guiding a rapier belt, characterized in that the guide element (25, 25a, 25b, 25c, 39, 43, 44, 44a) has a projection (32, 49, 51, 55, 56) is provided, which - when installed in a rapier weaving machine - is arranged on the side of the rapier belt facing a reed and is oriented essentially radially to the axis of rotation of a sley and which forms a guide surface (35, 54) for a side surface of the rapier band, and that the guide element has a web (33, 33a, 33b, 33c, 50) which is oriented essentially perpendicular to this projection when viewed in the direction of movement of the feeding gripper belt and which ends at a distance from the projection and which forms at least one guide surface which extends substantially perpendicular to the guide surface of the projection assigned to the side surface.

Guide element according to claim 1, characterized in that on the guide surface (35, 54) of the projection (32, 49, 51, 55, 56) assigned to a side surface of the gripper belt, a guide surface (37) running essentially at right angles thereto and assigned to the underside of a gripper belt ) connects.

Guide element according to claim 1 or 2, characterized in that on the underside of the web (33, 33a, 33b, 33c, 50) on the side facing away from the projection (32, 49, 51, 55, 56) one associated with a side face of the gripper belt Guide surface (34) connects.

4. Guide element according to one of claims 1 to 3, characterized in that the web (33a, 33b, 33c, 50) and the projection (49, 51, 55, 56) are arranged at a distance from one another in the direction of movement of a gripper belt.

5. Guide element according to one of claims 1 to 4, characterized in that at least two partial guide elements (45, 46; 47, 48; 47a, 48a) are provided, one of which has the projection (49, 51, 55, 56) and another has the web (33a, 33b, 33c, 50).

6. Guide element according to claim 5, characterized in that the partial guide element, which has the web (33a, 33b, 33c, 50), is provided with a guide surface (53) which is assigned to the side surface of the gripper belt, which - when installed in a rapier weaving machine - facing away from the reed.

7. Guide element according to claim 5 or 6, characterized in that the partial guide element (46, 55) is provided with the guide surface which is assigned to the underside of the gripper belt.

8. Guide element according to one of claims 1 to 7, characterized in that the top and bottom of the web (33, 33c, 50) serve as guide surfaces for a gripper belt which has a longitudinal groove open to a side surface.

9. Guide element according to one of claims 1 to 8, characterized in that the projection (32, 49, 51, 56) - when installed in a rapier weaving machine - is the most projecting part radially from the axis of the sley.

10. Guide element according to one of claims 1 to 9, characterized in that the projection (32, 49, 51, 55, 56) is sharpened or needle-shaped.

11. Guide element according to one of claims 1 to 10, characterized in that the web (33, 33a, 33c, 50) is set back with respect to the end of the projection (32, 49, 51).

12. Guide element according to one of claims 1 to 11, characterized in that the guide surface assigned to the underside of the gripper belt (19, 36, 38) is stepped.

13. Guide element according to one of claims 1 to 12, characterized in that the lateral guide surface (35) formed by the projection (32) is limited by one or two guide ribs (40).

14. Guide element according to one of claims 1 to 13, characterized in that one or both lateral guide surfaces (34, 35) are provided with a guide shoulder (41, 42).

15. Guide element according to claim 9, characterized in that the projection (32, 49, 49a, 51) and web (33, 33a, 33c) - seen transversely to the direction of movement of a gripper belt - are arranged in a common plane.

16. Guide element according to claim 15, characterized in that the webs (33a, 33c) and projections (49, 49a, 51) arranged in a common plane - seen transversely to the direction of movement of a gripper belt - are part of respective other guide elements.