Classifications

• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
  • D03D47/27—Drive or guide mechanisms for weft inserting
  • D03D47/277—Guide mechanisms

Definitions

• the invention relates to a guide element for a Greifertransportele ⁇ ment a loom that has guides that form a formschlüs ⁇ sige, open to one side enclosure for the gripper transport element.
• gripper bars or gripper bands are provided, which are introduced from one side of the loom forth in a shed.
• a gripper transport element 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.
• the gripper transport element moves with the gripper and the weft yarn to about the middle of the shed, where it also receives a transfer gripper also transported by a gripper transport element, which takes over the inserted weft thread and then moves out of the shed onto the other Transported side of the shed.
• the gripper conveyor moves with a gripper, a Neh ⁇ mergreifer, 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.
• guide elements 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 gripper belt. 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 Füh ⁇ tion 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 Sei ⁇ te secure the rapier against dodging to the open side.
• These guides which are intended to avoid dodging of the gripper belt in the direction of the open side, are relatively small. As a result, significant wear occurs on the guide elements and also on the gripper transport elements in a relatively short time.
• C-shaped guide elements 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 upper side and the lower side of the gripper transport element keep a distance from the regions of the guide elements lying opposite one another, so that they are not guided.
• 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, in particular only guides with relatively small guide surfaces are provided in the direction of the reed, so that rapid wear is to be expected.
• the object of the invention is to provide guide elements of the type mentioned in the introduction which improve the guiding of the gripper conveyor elements.
• the enclosure is provided with at least one projection assigned to at least one longitudinal groove on the underside of the gripper transport element and on the open side subsequently to the projection with a shoulder whose upper edge forms a guide for the gripper transport element which extends is located below the Ober ⁇ edge of the projection.
• the enclosure surrounds the gripper transport element with guides which are also assigned to the top side and the bottom side of the gripper transport element, relatively large guides are produced without the need to increase the dimensions. It is even possible to reduce the cross-sections of the gripper transport elements without the guides and guide surfaces having to be reduced in size for this purpose. Smaller cross sections lead to lower masses and therefore permit higher weaving speeds.
• the protruding from the enclosure to the open side 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 warp threads in the guide elements. be caught, which could lead to damage to the warp threads and / or Kettfa ⁇ denbrüchen.
• 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 slightly pushed apart from the upper edge of the guide elements.
• 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 upper edge, so that it easily penetrates between the warp threads, which have already been pushed apart a little, so that the risk of warp threads being caught is substantially reduced come into contact with the guides for the Grei ⁇ finished transport element.
• FIG. 1 shows a perspective view of a guide element according to the invention
• FIG. 2 is a perspective view of the guide element of FIG. 1 from the other side
• FIG. 3 shows a schematic side view of the guide element according to FIGS. 1 and 2 with a gripper transport element guided therein
• 4 shows a view of the guide element according to FIGS. 1 to 3 with a gripper transport element cut at another point
• FIG. 3 shows a schematic side view of the guide element according to FIGS. 1 and 2 with a gripper transport element guided therein
• 4 shows a view of the guide element according to FIGS. 1 to 3 with a gripper transport element cut at another point
• FIG. 5 is a schematic view of a further embodiment of a guide element with a cut Greifer ⁇ transport element
• FIG. 6 shows the guide element according to FIG. 5 with a modified gripper transport element
• FIG. 7 is a perspective view of a further embodiment of a guide element
• FIG. 8 is a perspective view of the guide element of FIG. 7 from the opposite side
• FIGS. 7 and 8 show a schematic view of the guide element according to FIGS. 7 and 8 with a section through a gripper transport element
• FIG. 10 shows the view of the guide element according to FIGS. 7 to 9 with a gripper transport element cut in another position
• Fig. 11 further embodiments of the invention guide to 18 elements.
• the guide elements shown in Fig. 1 to 18 are similar to that shown in EP 0576854 A1, attached to a sley, which also receives a reed.
• the sley carries out reciprocating movements in order to strike a weft thread against the edge of the fabric.
• the guide elements are brought into a shed through the lower Kettfa ⁇ schschschar when the reed in the is the rearmost position and a weft thread is entered.
• the sley moves with the Web ⁇ sheet towards the edge of the goods, wherein the guide elements, after the gripper conveyor element has been withdrawn, again move out of the shed through the lower warp thread.
• the Web ⁇ sheet is in the furthest moved back position and in which a gripper transport element is inserted into a shed.
• top and bottom they refer to this position in each case.
• the guide element 10 shown in FIGS. 1 to 4 has a fastening part 11, with which it is fastened on a sley or an intermediate profile in a row one behind the other with the same guide elements.
• the region 12 of the guide element Above the fastening part 11 is the region 12 of the guide element, which is intended to penetrate into a shed.
• the guide element has guides 14, 15, 16, 17 and 18, which engage or grasp a gripper transport element 19 (FIGS. 3 and 4) in a form-fitting manner, so that the totality of the guides 14, 15, 16, 17, 18 is a Enclosed for the Greifertransport ⁇ element 19 is called.
• the skirt 13 is one-sided, i. 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 the gripper conveyor element 19 from being deflected upwards.
• the guides 17 and 18 are side edges of projections 40, 41 which protrude from the guide 16 associated with the upper side or from the guide 14 associated with the lower side and leave an open gap therebetween.
• the guide 18 runs substantially parallel to the guide 15.
• the guide 17 extends at an angle of approximately 45 ° to the guide 16.
• the upper, located in the region of the open side of the enclosure 13 edge of the Greifertrans ⁇ port 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.
• the gripper transport element 19 has a widening 21 (FIG. 4) extending over at least part of its length and having a length of e.g. 500 mm, which remains outside of the receptacle 13 and which serves to pick up 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 with respect to both a horizontal axis and a vertical axis.
• the widening 21 can be formed in one piece on the Grei ⁇ finished transport element 19.
• a guide part is attached to the gripper transport element 19, which supplements and / or replaces the gripper transport element 19 over part of its length and which has the widening 21 and carries the gripper.
• 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.
• the device for penetrating a shed is true portion 12 of the guide elements 10 processed so that it tapers toward the open side to the projection 20, which forms a kind of tip.
• a side edge 22 in the manner of a groove runs 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 has an almost constant width in this embodiment. In a modified embodiment, the guide 15 has an approximately trapezoidal shape.
• the guide 14 tapers in the direction of 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 surfaces adjoining the upper edge 23 are chamfered so that they extend obliquely to the flanks of the region 12 as far as the guides 16, 17.
• the upper edge 23 has a highest point 24, which lies in the region of the open side of the receptacle 13.
• This highest point 24 is the point at which the guide elements 10 first penetrate into a warp thread and thereby spread apart the warp threads.
• the warp threads then slide on the inclined surfaces which adjoin the upper edge 23. They are already relatively far apart when the projection 41 and the projection 20 come into their Be ⁇ rich. Since the projection 20 lies under the upper edge 42 of the projection 41 and is preferably designed as a point, it will intervene 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.
• 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 carried along by the gripper transport element and torn or damaged.
• a particularly good spreading of warp threads is obtained when the guide element 10 is made relatively wide in the region of the guide 15.
• FIGS. 5 and 6 correspond in principle to the embodiment according to FIGS. 1 to 4, but the guides face each other in pairs and one pair runs perpendicular to the other pair.
• the guides 14, 16 guide the Greifer ⁇ transport element 19 against dodging in the vertical direction.
• the guides 15, 18 and 27 extend parallel to one another and prevent deflection of the gripper transport element 19 in the horizontal direction.
• the gripper transport element 19 of FIG. 5 is provided with a broadening 28 which is smaller in height than the height of the gripper transport element.
• the outer sides of the sections forming the guides 18 and 27 t ⁇ serve as guides 45, 46 which lie opposite corresponding surfaces of the widening 29 of the gripper transport element 19.
• the upper edge of the guide elements is designed to have a highest point in the region of the open side, similar to the highest point 24 of the embodiment according to FIGS. 1 to 4, with which the Guide elements first einrin ⁇ in a warp thread.
• FIGS. 7 to 10 corresponds in its basic structure to the embodiment according to FIGS. 1 to 4, so that reference is made to the description for FIGS. 1 to 4 and the same speedsszeich ⁇ NEN be used.
• a projection 30 projects into the receptacle 13 from the guide 14 assigned to the underside of the gripper transport element 19.
• This projection 30 forms additional side guides which prevent the gripper transport element from dodging in a horizontal direction and in particular in the direction of the open side. The enlargement of the guides serves to reduce the wear.
• the upper edge 43 of the attachment 20 is offset downwards relative to the guide 14. This further reduces the risk of warp threads coming into contact with the upper edge 43 of the attachment 20, since the warp threads are spread apart by the projection 41 and the adjoining side surfaces of the guide element. The risk of damaging the Kettfä ⁇ 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.
• a distance or play 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. This avoids that the relatively narrow upper edge in the regions of the groove base of the longitudinal groove of the gripper transport element generates increased wear.
• a clearance or play is also provided between the underside 44 of the projection 40 of the guide element 10 and the groove bottom of a longitudinal groove of the gripper transport element 19.
• the gripper transport element 19 has a flat, rectangular cross section and is particularly suitable for use as a gripper belt, which can be guided around a drive wheel of a rapier weaving machine by means of a guide block.
• the gripper transport element 19 is guided by means of guide elements 80, which are a guide 81 for the smooth, not through 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.
• 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 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 Leksnu ⁇ th of the gripper transport element 19 a game is present.
• the upper edge 43 of the attachment 20 does not have to lie lower than the guide 88, as in the embodiment according to FIG. 14 or 15. However, it is essential that the upper edge 43 of the projection 20 is arranged lower than the upper edge 42 of the projection 41.
• the projection 41 is kept 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.
• associated guide 84 is left a game.
• FIG. 18 shows a modified embodiment of FIG. 17, in which the upper side of the gripper transport element 19 is provided with a longitudinal groove, into which a projection 86 of the guide element 80, which protrudes from the projection 41, engages.
• Gripper transport element 19 is guided in the vertical direction only by the upper edge of the projection 41 and the lower edge of the projection 86.
• a play 85 is provided between the upper side of the gripper transport element and the guide element 80.
• the guide shapes according to FIGS. 14 to 18 are particularly well suited for absorbing torsional forces that can be introduced into the gripper transport element 19 due to the arrangement of a gripper, not shown, in particular during accelerations and decelerations.
• the An ⁇ set 20 of 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 possible in particular when the guide elements 10, 80 are relatively wide in the region of the guides 15, 87 and therefore warp threads are correspondingly widely spread when the upper edge 43 of the projection 20 reaches the area of the warp threads.
• the invention is not limited to the exemplary embodiments illustrated. In particular, it is possible to implement the features described for the individual exemplary embodiments also in other embodiments. For example, it is also possible to provide a projection corresponding to the projection 30 in the exemplary embodiment according to FIGS. 5 or 6. It is likewise possible to use other gripper transport elements in the embodiments according to FIGS. 1 to 4 or 7 to 10, in particular gripper transport elements which are provided with widenings 28 or 29 as shown in FIGS. 5 and 6. In further modified embodiments, in the area of the guide 16, which is assigned to the upper side of the gripper transport element 19, one or more projections extending inwardly into the receptacle 13 are provided corresponding to the projection 30 of FIGS. 7 and 10.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Looms (AREA)
• Treatment Of Fiber Materials (AREA)
• Framework For Endless Conveyors (AREA)

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• 2004
  • 2004-10-05 DE DE102004049256.5A patent/DE102004049256B4/de not_active Expired - Lifetime
• 2005
  • 2005-10-05 WO PCT/EP2005/010705 patent/WO2006037619A1/fr not_active Ceased
  • 2005-10-05 AT AT05797775T patent/ATE512240T1/de active
  • 2005-10-05 CN CN2005800337866A patent/CN101035940B/zh not_active Expired - Lifetime
  • 2005-10-05 EP EP05797775A patent/EP1799896B1/fr not_active Expired - Lifetime
  • 2005-10-05 EP EP11168823.0A patent/EP2372001B1/fr not_active Expired - Lifetime

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