WO2000011249A1

WO2000011249A1 - Rapier weaving machine with at least one gripper band and guide means

Info

Publication number: WO2000011249A1
Application number: PCT/EP1999/002013
Authority: WO
Inventors: Kristof Roelstraete
Original assignee: Picanol N.V.
Priority date: 1998-08-25
Filing date: 1999-03-24
Publication date: 2000-03-02
Also published as: DE59914379D1; EP1123430A1; EP1123430B1

Abstract

The invention relates to a rapier weaving machine with at least one gripper band for the grippers (7), wherein guide means (55, 56) are provided that form guides (31, 32, 34) in the gripper band (9) for the top part, the flank and the lower part of the gripper band (9) in the edge area of the gripper band (9) opposite the reed (6), wherein a rib (53) is spaced laterally in relation to the flanks of the gripper band (9) and wherein the guide means (55) form guides (29, 30) for the lower part of the gripper band (9) in the area facing the reed (6) and for flank of the rib (53) facing the reed (6).

Description

Rapier weaving machine with at least one rapier belt and guide means

The invention relates to a rapier weaving machine with at least one rapier belt that drives a rapier that lies substantially above the upper side of the rapier belt, and with a sley to which a reed and guide means are attached, which have guides for the rapier belt that face the upper side, are assigned to a side flank and the underside of the gripper belt and a rib projecting downwards.

The applicant uses a rapier weaving machine of the type mentioned at the outset in its rapier weaving machines currently sold. The construction corresponds essentially to US 5,413,151. In the extension of the gripper belt, a guide part is attached, in the longitudinal center of which a gripper is attached. The guide part, the width of which corresponds to the width of the gripper belt, has a rib projecting downward on the side facing away from the reed. The leadership ^¬ part and the rapier are performed with mounted on the batten hook-shaped guide means that are open to the reed out. The hook-shaped guide means have guides that the top of the guide member and the gripper belt and the bottom of the guide member and Gripper belt are assigned. A further guide is assigned to the side flank of the gripper belt and the guide part facing away from the reed. Furthermore, guides are provided which guide the rib of the guide part in the transverse direction, so that the guide part is guided on all sides with the gripper. This construction works reliably. One problem, however, is that with this type of construction - as with all other types of practical use - wear occurs relatively quickly so that the guide part has to be replaced.

In another practical construction, as is known from US 4,834,146, hook-shaped guide elements are attached to the sley, which almost completely enclose the top and the bottom of the rapier belt. The underside of the gripper belt is provided with a groove running in the longitudinal direction, into which guides of the hook-shaped guide means engage, so that the gripper belt is also guided in the transverse direction. Since the hook-shaped guide means almost completely enclose the gripper belt, the gripper is attached to the side of the gripper belt. The lateral arrangement of the gripper on the gripper belt leads to considerable transverse loads on the gripper belt, in particular when braking and accelerating, so that relatively heavy wear also occurs. If a certain amount of wear is reached, the entire gripper belt must be replaced with this type.

In order to avoid the wear and other disadvantages of the design according to US 4,834,146, it is also known from EP 0 709 505 AI to provide two different types of guide means instead of the hook-shaped guide means, one of which is the guide means of the top of the gripper belt and the guide means of the other type are assigned to the underside of the gripper belt. Although the guides of the two guide means can be ground here, remains the disadvantage of the lateral arrangement of the grippers and the resulting stresses in the transverse direction.

In order to avoid the stresses in the transverse direction of the type according to US 4,834,146 and the type according to EP 0 709 505 AI, it is known from EP 0 715 009 AI to guide only the underside of the gripper belt by means of guide elements and the gripper centrally on the Arrange the top of the gripper belt. The guide elements engage in a groove on the underside of the gripper belt. The gripper should be designed so that its center of gravity coincides with the center of gravity of the gripper belt or is still below this. However, it has not been disclosed how a gripper must be designed so that its center of gravity is in or below the center of gravity of the gripper belt.

It is also known from US Pat. No. 5,183,084 to have the movement of a rapier belt, on the end of which a rapier is attached in the center, partially overlap with the movement with which the guide means are introduced into the shed. In this design, two types of guide means are provided, one of which has only a guide for the underside of the gripper belt and the other has a guide for an upper side edge, a side surface and a guide for the edge region of the underside. In this design, the gripper belt is supported over a large part of its movement only on the underside, so that there is a risk that the gripper belt will twist about its longitudinal axis, especially when accelerating and braking, especially when high speeds are aimed for.

The invention has for its object to improve a rapier weaving machine of the type mentioned so that the wear is reduced.

This object is achieved in that the rib is arranged at a lateral distance from the side flanks of the gripper belt. net is that the guide means form guides for the top, the side flank and the underside of the rapier in the edge region of the rapier band facing away from the reed, and that the guide means in the area facing the reed guides for the underside of the rapier band and for the reed facing Form the side flank of the rib, while the underside and the side flank of the rib facing away from the reed are unguided.

The invention is based on the consideration that the main cause of the wear are forces that are caused in particular when braking and accelerating from the gripper head, which has a center of gravity above the top of the gripper belt, so that the forces tend to the gripper belt and if necessary, a guide part that extends the gripper belt and rotates the gripper is rotated about the longitudinal axis. The invention therefore provides that the guides, which counteract the twisting of the gripper belt, engage the gripper belt with the cheapest possible lever arms, so that the forces acting against the twisting are reduced. Since the rib is arranged at a distance from the side flank of the gripper belt facing away from the reed, it is possible for the guide means to form guides for the underside of the gripper belt on both sides of the rib. By shifting the rib towards the center of the gripper belt, an area of the underside of the gripper belt and / or of the guide part is created, in particular on the side of the rib facing away from the reed, on which a guide is supported, which has a cheap lever arm and thus a relatively small amount Counteracts twisting forces. A particular advantage is that the side flank facing away from the reed and thus towards the edge of the goods and the underside of the rib do not work together with guides of the guide means. These surfaces, which come into contact with warp threads when the shed is closed, are therefore not exposed to wear on the guides, so that damage to the warp threads is not to be expected from them. Further advantages and features of the invention result from the following description of exemplary embodiments and the subclaims.

1 shows a cross section through a rapier weaving machine according to the invention in a schematic representation,

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

3 shows a detail of FIG. 2 on a further enlarged scale with different positions of a reed and guide means,

4 shows a plan view of the gripper belt according to FIG. 3,

5 shows a section similar to FIG. 3 with two types of guide means,

6 shows a section similar to FIG. 5 with an additional guide rib,

7 is a view in the direction of arrow F7 of FIG. 5,

8 shows a section similar to FIG. 3 of a modified embodiment,

9 is a view in the direction of arrow F9 of FIG. 8,

10 is a plan view of the gripper belt of FIG. 9,

11 shows a section along the line XI-XI of FIG. 10,

FIG. 12 is a view similar to FIG. 9 of a further embodiment and

13 is a plan view of the gripper belt according to FIG. 12. The weaving machine shown in Fig. 1 has two side parts 1, 2 in which a sley 3 is mounted. The sley 3 is provided on both sides with drives 4, 5, by means of which it can be driven to move back and forth. A reed 6 is arranged on the sley 3, by means of which inserted weft threads are struck on the edge of the goods.

The weft threads are introduced into a shed in a known manner by means of a donor gripper 7 and a slave gripper 8. The donor gripper 7 takes over a weft thread on one side of the weaving machine in a known manner and transports it to approximately the middle of the weaving machine, i.e. in the middle of a shed. There it is taken over by the take-up rapier 8, which then brings it to the opposite side of the weaving machine.

The master gripper 7 and the slave gripper 8 are each driven by means of a gripper belt 9, which push the slave gripper 8 and the master gripper 7 into an open shed and pull them out again. The gripper belts 9 are preferably made of fiber-reinforced plastic and essentially have a flat, rectangular cross-section, their flat sides each lying approximately horizontally. A longitudinal rib 53 projects downward from the underside, the height of which corresponds approximately to the thickness of the gripper belts 9. The width of the rib 53 corresponds approximately to its height. The gripper belts 9 are guided in the area of the side parts 1, 2 by means of stationary guides 10, 11. The gripper belts are driven by means of gear wheels 12, 13, around which they are guided. They are held on the circumference of the gear wheels 12, 13 by means of guide blocks 14.

The gears 12, 13 are driven by means of drives 15, 16 for a reciprocating rotary movement. The drives 15, 16 are synchronized with the drives 4, 5 of the sley 3. The master gripper 7 and the slave gripper 8 are arranged directly on the ends of the gripper belts 9 or on guide parts which are each attached to the front ends of the gripper belts 9. The guide parts are designed so that they correspond to the cross section of the gripper belts 9.

In the area of the shed, the gripper belts 9 are guided by means of guide means 17. These guide means 17, which will be explained in detail in the following figures, are components which have only a slight extension in the longitudinal direction of the shed and which are drawn in an exaggerated manner in FIG. 1 for the sake of illustration. The guide means 17 are arranged on the sley 3 so that they move with the sley 3 and the reed 6. They dip into a shed 21 from below, as shown in FIGS. 2 and 3. This shed 21 is formed by an upper warp thread sheet 22 and a lower warp thread sheet 23, which are raised and lowered by means of shed forming means (not shown) and converge in the fabric edge 24. The thread guide means 17 are so narrow in the longitudinal direction of the shed 21 that they can pass between the warp threads of the lower warp thread sheet 23. When the reed 6 is moved towards the fabric edge 24 in order to strike a weft thread (dashed position in FIG. 3), the guide means 17 are moved out of the shed 21 through the lower warp thread sheet 23. If the reed 6 is moved back to the position shown in solid lines in FIG. 3, the guide means 17 penetrate the lower warp thread sheet 23 again and enter the shed 21. After a weft thread has been struck, the shed 21 is changed, with at least some of the warp threads of the upper warp thread sheet 22 being moved downward and at least some of the warp threads of the lower warp thread sheet 23 being moved upward. As can be seen from FIGS. 2 and 3, the guide means 17 are fastened to a weaving frame profile 26 by means of screws 25. As already mentioned, the master gripper 7 and the slave gripper 8 can be attached to guide parts 18 (FIG. 12), which are arranged in an aligned extension of the gripper belts 9. 2 to 5 only one encoder gripper 7 is shown with its gripper belt 9. Since the guidance of the gripper belt 9 of the slave gripper 8 is identical in mirror image, the description also applies to the guidance of the gripper belt 9 of the slave gripper.

The gripper belt 9 shown in FIGS. 2 and 3 has a cross-shaped cross section with arms 50, 51, 52 and 53 arranged symmetrically to a central, vertical plane of symmetry 34. The arm 53 forms a rib projecting downwards. In the arms 50, 51, rows of holes 58, 59 are provided (FIG. 4), which are intended for the engagement of teeth of the drive gear wheels 12, 13 arranged in two rows. The guide means 17 have two guide elements 55, 56, of which the guide elements 55 are assigned to the rapier 9 on the side facing the reed 6 and the guide elements 56 are assigned to the rapier 9 on the side facing away from the reed 6. The guide elements 56 form three guides, of which a guide 31 is assigned to the upper side of the rapier belt 9, a guide 34 to the side flank facing away from the reed 6 and a guide 32 to the underside of the rapier belt 9. These three guides 31, 34, 32 enclose the lateral edge region of the gripper belt 9 facing away from the reed 6.

The guide elements 55 form two guides, of which a guide 29 on the side of the rib 53 facing the reed 6 is assigned to the underside of the gripper belt 9, while the further guide 30 is assigned to the side flank of the rib 53 facing the reed 6. A distance A is left between the guide 32 and the side flank of the rib 53 facing away from the reed 6, so that guides of the guide means 17 are not assigned to this side flank or the underside of the rib 53. These areas are therefore not exposed to wear so that they are not worn or damaged. As can be seen in particular from FIG. 3, the warp threads lie against this rib 53 when the shed 21 is closed, if the rapier belts 9 have not yet been completely pulled out of the loom, so that they are guided by elements of the rapier belt 9. that are not subject to wear. This rib 53 extends at least over the length of the rapier belt 9, which can be inserted into the shed 21.

The embodiment according to FIG. 5 differs from the embodiment according to FIGS. 2 and 3 primarily by the guide means. In this design, the guide elements 55, 56 are arranged offset to one another in the direction of movement of the gripper belt 9. The guide elements 55 and the guide elements 56 can each be individual components which are fastened to the weaving frame profile 26 separately from one another by means of screws 25. For example, however, components are provided which each contain a guide element 55 and a guide element 56 as one structural unit, but which are at a distance from one another in the direction of movement of the gripper belts 9.

As in the exemplary embodiment according to FIGS. 2 and 3, the guide elements 55 have a guide 30 assigned to the side flank of the rib 53 facing the reed 6 and a guide 29 assigned to the underside of the gripper belt 9. The guide 29 extends approximately over a third of the width of the Gripper belt 9. The guide elements 56 grip the gripper belt 9 on the side facing away from the reed 6 and have a guide 31 assigned to the upper side, a guide 32 assigned to the underside and a guide 34 assigned to the intermediate side flank.

In order to create space for a sufficiently long guide 31 of the guide means 56, fastening means 35 of the gripper 7 are offset off-center in the direction of the reed 6 the gripper belt 9 or a guide part attached. The guides 29, 32 and 31 guide the gripper belt 9 in the vertical direction. The guides 30 and 34 guide the gripper belt 9 in the horizontal direction, so that the gripper belt 9 is guided in all directions.

For practical reasons, tolerances must be provided between the guides 29, 30, 31, 32, 34 and the gripper belt 9, which are approximately in the order of magnitude of 0.3 mm. Because of the center of gravity of the gripper 7, which is eccentric with respect to the gripper belt 9, forces arise in particular when accelerating and braking, which tend to twist the gripper belt 9. Because of these forces, the gripper belt 9 actually rotates within the tolerances, so that in particular when rotating (counterclockwise) from the reed 6 there are almost point loads in the region of the guides 30, 31 and 32. In order to keep the possible wear low despite these approximately punctiform loads, the guides 30, 31 and 32 are arranged and designed such that the load points act with a lever arm as large as possible against the rotation, so that the forces of the almost punctiform loads are then relatively low can be held.

The guide means 55, 56 are usually arranged at uniform intervals in the longitudinal direction of the shed 21. In order to reduce heavy loads on the gripper belt 9 in the areas in which accelerations and braking occur, which want to turn the gripper belt 9 with the gripper 7 away from the reed 6, it can further be provided that the guide means 56 and possibly also the guide means 55 are arranged in closer succession.

The use of two different types of guide elements 55, 56, which each form guides 29, 30 and 31, 32, 34, which lie opposite one another, has the advantage that all guides for a grinding tool are accessible and can therefore be machined by grinding. The guides 29, 30 of the guide means 55 can be processed by means of separate grinding processes or by means of a profile grinding wheel. The guides 31, 32, 34 of the guide means 56 can be machined very precisely by means of a profile grinding wheel. This grinding of the guides 29 to 34 has the advantage that very smooth guide surfaces can be created and that these guides can be tolerated very precisely to one another.

In modified embodiments, two types of guide means are provided, in which the guides 29 to 34 are distributed in a different way. For example, it is possible to provide a hook-shaped guide means which has the guides 29, 30, 31, 34 and a second guide means which is provided with the guide 32. It is also possible to provide a guide means with the guides 29, 30, 32 and a further guide means with the guides 31, 34.

It is also possible to provide more than two different guide means. For example, a guide means can be provided corresponding to the guide means 55, which has the guides 29 and 30, and in addition to this guide means a guide means with the guides 31, 34 and a further guide means with the guide 32.

The embodiment according to FIG. 6 differs from the embodiment according to FIGS. 3 and 5 initially in that the rib 53 'of the gripper belt 9' does not lie in the longitudinal center plane, but is offset in the direction of the edge of the goods 24. In addition, a metal guide rib 28 is inserted into the underside of this rib 53 'and extends essentially over the length of the gripper. The embodiment according to FIGS. 8 to 11 provides that in the area of the gripper 7 a guide rib 28 'is provided in the form of an angularly bent sheet 70, one leg of which is arranged on the side next to the rib 53', to which no guide is assigned is. This rib maintains a distance B from the guide elements 56, so that this guide rib 28 'cannot be damaged either.

The guide rib 28 'projects downward over the rib 53'. The bent sheet metal 70 is provided in the area opposite the guide rib 28 with a plurality of lugs 71 which engage in recesses 72 which are provided in the top of the beginning of the gripper belt 9, as shown in FIG. 10. The plate 70 is held clamped between the gripper 7 and the gripper belt 9 'by means of the lugs 71.

In Fig. 10 it is also shown that the gripper belt 9 'is provided with a row of holes 60 which serves to receive the teeth of the gears 12, 13. This row of holes 60 is arranged off-center next to the rib 53 ', on the side closer to the reed 6. As in the embodiment according to FIGS. 2 and 3, this prevents the holes in the rows of holes from going through the rib 53 '.

As shown, for example, FIGS. 12 and 13, it is of course within the scope of the invention not to fasten the master gripper 7 and / or the slave gripper 8 directly to the front end of the gripper belt 9, but rather to a guide part 18 whose contour is produced as a separate component Contour of the gripper belt 9 essentially corresponds. Such a guide part 18 is expediently made of plastic. The gripper belt 9 according to FIGS. 12 and 13 has a contour similar to the contour of the gripper belt according to FIG. 3, but the rows of holes 58, 59 are offset from one another in the longitudinal direction of the gripper belt 9. orders, engage in the two rows of teeth of the drive gears 12, 13.

The rib 53, 53 'can be produced in one piece with the gripper belt 9, 9' concerned. It is also possible to produce the rib 9, 9 'as a separate component and to subsequently attach it to the underside of the gripper belt 9, 9', for example by means of screw connections.

In a modified embodiment it is provided that the gripper belts 9, 9 'are not guided around the drive gears 12, 13 as in FIG. 1, but are guided tangentially to these drive gears.

Claims

claims

1. rapier weaving machine with at least one rapier belt (9) which drives a rapier (7, 8) which is substantially above the top of the rapier belt (9), and with a sley (3) on which a reed (6) and Guide means (17, 55, 56) are attached, which have guides (29, 30, 31, 32, 34) for the gripper belt (9), the top, a side flank and the underside of the gripper belt and a downwardly projecting rib ( 53, 53 '), characterized in that the rib (53, 53') is arranged at a lateral distance from the side flanks of the rapier belt (9), the guide means (17, 55, 56) in which the reed (6) edge region of the rapier band (9) facing away form guides (31, 32, 34) for the top, the side flank and the underside of the rapier band, and that the guide means (17, 55, 56) in the region facing the reed (6) guides ( 29, 30) for the underside of the gripper belt (9) and for d Form the side flank of the rib (53, 53 ') facing the reed (6), while the underside and the side flank of the rib facing away from the reed (6) are unguided.

2. rapier weaving machine according to claim 1, characterized in that the rib (53) is arranged in the longitudinal center of the rapier belt (9).

3. rapier loom according to claim 1 or 2, characterized in that the rib (53, 53 ') extends at least over the length of the rapier belt (9), which in a shed

(21) can be introduced.

4. rapier weaving machine according to one of claims 1 to 3, characterized in that the rapier belt (9) is provided with holes (58, 59; 60) for teeth of a drive gear (12, 13) arranged eccentrically to the longitudinal center.

5. rapier loom according to one of claims 1 to 4, characterized in that the gripper (7, 8) is held by means of fastening means (35) which are arranged offset towards the longitudinal center of the rapier belt (9) in the direction of the reed (6).

6. rapier weaving machine according to one of claims 1 to 5, characterized in that the guide means (17, 56) for the edge area facing away from the reed (6) a guide

(31) for the top of the gripper belt (9), which extends approximately over a third of the width of the gripper belt (9).

7. rapier loom according to one of claims 1 to 6, characterized in that the guide means (17, 55) for the reed (6) facing edge area a guide

(29) for the underside of the gripper belt (9), which extends approximately over a third of the width of the gripper belt.

8. rapier weaving machine according to one of claims 1 to 7, characterized in that the guides (29, 30, 31, 32, 34) are distributed on at least two different types of guide means (55, 56).

9. rapier weaving machine according to claim 8, characterized in that the one type of guide means (56) having the reed (6) facing edge of the rapier belt (9) associated guides (31, 32, 34).

10. rapier weaving machine according to one of claims 1 to 9, characterized in that the rib (53, 53 ') has a height which corresponds essentially to the thickness of the rapier belt (9).

11. rapier weaving machine according to one of claims 1 to 10, characterized in that in the region of the rapier (7, 8) next to the rib (53, 53 ') on the side facing away from the reed (6) a guide rib (28') made of metal is provided.

12. rapier weaving machine according to claim 11, characterized in that the guide rib (28 ') projects beyond the rib (53') downwards.