EP2128317A1 - Method and device for inserting weft thread in a gripper loom - Google Patents

Abstract

The device (1) has a gripper strip (3b) moving in an insertion direction. A guide structure (5) is provided at the gripper strip and/or at a gripper head (3a). Guide elements (6.1-6.3) are combined together with the guide structure for guiding the gripper strip and/or the gripper head into a shed of a gripper loom. Start of the guiding of the guide structure by the guide elements is decelerated till gripping points (3') are 18 or 24 centimeters far in the shed. A trapezoidal element and a dovetail element are provided in the guide structure. Independent claims are also included for the following: (1) a method for inserting a weft thread into a shed of a gripper loom (2) a gripper loom including a device for inserting a weft thread into a shed of a gripper loom.

Description

The invention relates to a device and a method for introducing a weft thread into a shed of a rapier weaving machine according to the preamble of claim 1 or preamble of claim 6 and a rapier loom with such a device or equipped for carrying out such a method.

In rapier looms, the weft thread is usually entered into a shed by means of a gripper gripper fastened to a gripper bar or a flexible belt and taken over by a gripper gripper at a transfer point in the middle part of the shed and conveyed on. The Bringergreifer has the task to safely pick up the presented weft thread, enter the same in the shed and precisely fed to the taker rapier. The taker has the task to take over the weft safely, weiterzubefördern the same in the shed and release it after completion of the weft insertion. Each of the grippers comprises a gripper head, which is usually equipped with a thread clamp to clamp the weft during weft insertion.

In today's usual shot numbers increases the risk that the rapier head deviates from the ideal entry path and thereby damaged the shed by, for example, deviates down and thereby pulls warp threads from the lower compartment or lifts up and thereby entrains warp threads from the upper compartment. In addition, in the current numbers of shots, the safe transfer of the weft thread from the bringer rapier to the taker rapier more and more difficult. This problem is compounded by greater web widths. In current looms therefore usually a guide is provided which guides the rapier head or the rapier band during weft insertion in the shed.

It has been found that a lateral guidance of the rapier band at the edges can lead to damage of the edges. In particular, in rapier bands of fiber-reinforced plastics fibers are exposed by the Reibbeanspruchung the edges, which act very abrasive and can cause warp thread breaks.

A rapier with guide teeth for the gripper is off EP-A-0 468 916 known. The guide teeth are designed as a sliding support for the rapier band and for the gripper head and mounted on a sley of rapier loom. The gripper head is additionally equipped with a runner, which is guided laterally by the guide teeth. Thanks to the runner, the gripper head can be guided sideways without the guide teeth coming into contact with the edges of the gripper belt. In two embodiments, the guide teeth surround the edge of the runner or the runner surrounds the edge of the guide teeth, so that the rapier head is also guided with respect to the lift-off.

From EP-A-0 468 916 Known rapier loom has the disadvantage that comparatively little time is available for braking and accelerating the sley, since the sley must be in the rear rest position as soon as the gripper head dips into the shed or as long as the gripper head while retreating it is in the shed. Otherwise, there is a risk that the gripper head is deflected by the guide teeth attached to the batten so that it touches the warp threads of the shed and possibly damaged. The slowing down and acceleration of the sley within a short time results in a comparatively abrupt loading movement, by which the bearings and the drive parts of the sley are claimed correspondingly strong. In addition, the maximum achievable number of shots can be limited by the abrupt loading movement.

The object of the invention is to provide an apparatus and a method for introducing a weft thread into a shed of a rapier loom and a gripper loom with such a device or equipped for carrying out such a method in which the rapier or gripper head are guided in the shed , And by means of which the bearings and drive parts of the batten are less stressed compared to the prior art described above.

This object is achieved according to the invention by the apparatus defined in claim 1 and the method defined in claim 6 and by the gripper loom defined in claim 13.

The device according to the invention for introducing a weft thread into a shed of a rapier weaving machine comprises a gripper band movable in the entry direction, on the same a gripper head and at least one guide part or guide structure provided on the rapier band and / or on the gripper head, as well as a plurality of guide elements connected to the guide part or the guide structure cooperate to guide the rapier band and / or the rapier head in the shed, wherein the beginning of guiding the guide member or the guide structure is delayed by the guide elements until the hook tip at least 14 cm wide or at least 18 cm or at least 24 cm far in the shed. Advantageously, the guide elements are arranged on a batten of rapier loom.

In an advantageous embodiment of the beginning of the lateral guidance of the guide member or the guide structure is delayed by the guide elements until the hook tip is at least 14 cm wide or at least 18 cm or at least 24 cm wide in the shed. In a further advantageous embodiment, the beginning of the guidance of the guide member or the guide structure is delayed by the guide elements with respect to the lifting until the hook tip is at least 14 cm wide or at least 18 cm or at least 24 cm wide in the shed.

In a further advantageous embodiment, the device comprises a rapier, a rapier head and at least one guide member or a guide structure for a Bringergreifer and / or a rapier, a rapier head and at least one guide member or a guide structure for a Holergreifer, wherein the Bringergreifer associated guide member or the corresponding guide structure relative to the gripper tip of the Bringergreifers is set back by at least 14 cm, in particular at least 18 cm or at least 24 cm, and / or wherein the Holergreifer associated guide member or the corresponding guide structure relative to the gripper tip of the Holergreifers by at least 14 cm, in particular at least 18 cm or at least 24 cm back.

In a further advantageous embodiment, the guide elements for guiding the guide part or the guide structure relative to the tray edge are offset by at least 10 cm inwards or offset by at least 12 cm or at least 16 cm inwards.

In an advantageous embodiment, a profile is provided on or in the guide part or on or in the guide structure, for example a trapezoidal profile or a dovetail profile, wherein the guide elements are formed at least partially positively to the profile of the guide part or the guide structure to the rapier band and / or the To guide the gripper head in the shed by means of the profile and the guide elements.

Advantageously, at least a part of the guide elements is designed as a one-sided guide elements in order to guide the guide part or the guide structure respectively on one side and / or to support it on one side. Advantageously, one-sided guide elements are respectively arranged on both sides of the guide part or the guide structure in order to guide the guide part or the guide structure on both sides and / or support it on both sides, for example by arranging the one-sided guide elements mutually.

In a further advantageous embodiment, the beginning of the guidance of the guide part or the guide structure by the guide elements delayed until the gripper tip is 50 cm wide or 40 cm or 30 cm wide in the shed.

In the method according to the invention for introducing a weft thread into a shed of a rapier weaving machine, the weft thread is taken up by a gripper head, which is provided on a rapier band, and inserted into the shed. Furthermore, at least one guide part or a guide structure are provided on the rapier band and / or rapier head, which interact with guide elements to guide the rapier band and / or the rapier head in the shed, wherein the guide part or the guide structure are guided by the guide elements only when the hook tip is at least 14 cm wide or at least 18 cm or at least 24 cm wide in the shed.

In an advantageous embodiment, the weaving machine comprises a reed, which is provided on a sley, to strike a registered weft thread, wherein the guide member or the guide structure are guided by the guide elements only when the sley is in the rear rest position. In this case, the time at which the sley reaches the rear rest position substantially coincide with the beginning of the leadership of the guide member or the guide structure by the guide elements.

In a further advantageous embodiment, the weft thread is picked up by a rapier head of a rapier, which is provided on a rapier band, and entered into the shed and / or taken over and forwarded by a gripper head of a gripper rapier, which is provided on a rapier band. In addition, at least one guide member or a guide structure are provided on the rapier band and / or gripper head of the rapier or the taker rapier, which cooperate with guide elements to guide the respective rapier band and / or the respective rapier head in the shed, wherein the guide member associated with the rapier or the corresponding guide structure relative to the gripper tip of the Bringergreifers by at least 14 cm, in particular at least 18 cm or is set back at least 24 cm, and / or wherein the Holergreifer associated guide member or the corresponding guide structure relative to the gripper tip of the Holergreifers by at least 14 cm, in particular at least 18 cm or at least 24 cm is set back.

In a further advantageous embodiment variant, the guide elements for guiding the guide part or the guide structure are offset by at least 10 cm inwards relative to the compartment edge or offset inwards by at least 12 cm or at least 16 cm.

In an advantageous embodiment of the method, a profile is provided on or in the guide part or on or in the guide structure, for example a trapezoidal profile or a dovetail profile, wherein the guide elements are at least partially positively formed to the profile of the guide part or the guide structure to the rapier band and / or. or to guide the rapier head in the shed by means of the profile and the guide elements.

Advantageously, at least a part of the guide elements is formed as one-sided guide elements which guide the guide member or the guide structure respectively on one side and / or supported on one side, wherein on both sides of the guide member or the guide structure each one-sided guide elements are arranged to the guide member or to guide the guide structure on both sides and / or support, and wherein the one-sided guide elements, for example, are arranged mutually.

In a further advantageous embodiment of the method, the guide part or the guide structure are guided by the guide elements at the latest when the hook tip is 50 cm wide, in particular 40 cm or 30 cm wide in the shed.

Furthermore, the invention comprises a rapier loom with a device according to one of the above-described embodiments and forms and / or equipped for carrying out a method according to the above description.

In an advantageous embodiment, the gripper loom comprises a sley with reed for striking a registered weft thread, wherein the beginning of the leadership of the guide member or the guide structure by the guide elements is not prior to the time in which the sley has reached the rear rest position. In this case, the beginning of the guidance of the guide part or the guide structure by the guide elements substantially coincide with the time at which the sley has reached the rear rest position.

The device and the method according to the present invention and the gripper loom according to the invention have the advantage over the prior art described that thanks to the delayed start of the guidance of the rapier band and / or gripper head in the shed, the gripper head can already be inserted into the shed before the sley has reached the rear rest position without the risk that the rapier band and / or the rapier head is deflected by moving guide elements and damaged the warp threads. The gripper belt and / or the gripper head can then, when the sley is in the rear rest position, still be securely guided in the shed, depending on requirements laterally and / or with respect to deviations from below and / or above.

Conversely ends in the second half of the weft insertion in the retraction of the gripper head from the shed, the leadership of the rapier and / or gripper head according to the invention before the gripper head has left the shed. Thus, the time duration or the machine angle range during which the gripper band and / or the gripper head are guided in the shed, both in the first and in the second half of the weft insertion over the known from the prior art devices and methods can be shortened, so that a correspondingly longer period of time or machine angle range for the loading movement is available for striking the registered weft thread. The longer machine angle range which is available thanks to the device according to the invention and the method according to the invention makes it possible to carry out the loading movement less abruptly, as a result of which the bearings and the Drive parts of the batten are spared and / or can be performed easily.

The above description of embodiments and variants is merely an example. Further advantageous embodiments and variants will become apparent from the dependent claims and the drawings. In addition, in the context of the present invention, individual features of the described or shown embodiments and variants can be combined with each other to form new embodiments.

Fig. 1

einen Ausschnitt aus einer Greiferwebmaschine mit einer Vorrichtung zum Eintragen eines Schussfadens gemäss vorliegender Erfindung,

Fig. 2

ein Ausführungsbeispiel einer Vorrichtung gemäss vorliegender Erfindung in Schrägansicht,

Fig. 3

einen Querschnitt durch das Ausführungsbeispiel von Fig. 2,

Fig. 4

eine Seitenansicht des Ausführungsbeispiel von Fig. 2,

Fig. 5

ein weiteres Ausführungsbeispiel einer Vorrichtung gemäss vorliegender Erfindung,

Fig. 6

eine grafische Darstellung der Greiferbewegung für ein Ausführungsbeispiel gemäss vorliegender Erfindung,

Fig. 7A

eine grafische Darstellung der Ladenbewegung für eine herkömmliche Vorrichtung zum Eintragen eines Schussfadens, und

Fig. 7B

eine grafische Darstellung der Ladenbewegung für ein Ausführungsbeispiel gemäss vorliegender Erfindung.

In the following the invention will be explained in more detail with reference to the embodiment and with reference to the drawing. Show it:

Fig. 1

a detail of a rapier loom with a device for introducing a weft thread according to the present invention,

Fig. 2

An embodiment of a device according to the present invention in an oblique view,

Fig. 3

a cross section through the embodiment of Fig. 2 .

Fig. 4

a side view of the embodiment of Fig. 2 .

Fig. 5

a further embodiment of a device according to the present invention,

Fig. 6

a graphical representation of the gripper movement for an embodiment according to the present invention,

Fig. 7A

a graphic representation of the loading movement for a conventional device for introducing a weft thread, and

Fig. 7B

a graphical representation of the loading movement for an embodiment according to the present invention.

Fig. 1 shows a section of a rapier loom with a device 1 for entering a weft thread 2 according to the present invention. The gripper loom may comprise, for example, a reed 8 for striking registered weft threads and a thread supply 2a, from which the weft thread 2 is pulled off during insertion. Further, the rapier weaving machine may comprise a shed forming device which may be equipped, for example, with strands 7a, 7b to lift part of the warp yarns 12a, 12b and at the same time lower another part so as to form a shed 10 between the raised and lowered warp yarns. The apparatus 1 typically comprises a gripper belt 3b movable in the picking direction and a rapier gripper head 3a for inserting the weft yarn 2 into the shed 10 and a gripper belt 4b movable in the picking direction and a rapier gripper head 4a for winding the weft yarn in the middle region of the gripper Take over shed of the Bringergreifer and weiterzubefördern. Possible embodiments of the device 1 will be discussed in more detail in the following sections.

Fig. 2 shows an embodiment of an apparatus according to the present invention in an oblique view. The Figures 3 and 4 show the same embodiment in cross-section and in side view. In the in the FIGS. 2 to 4 In the exemplary embodiment shown, the device 1 comprises a rapier band 3b movable in the entry direction, on the same a gripper head 3a and at least one guide part or guide structure 5 provided on the rapier band and / or on the gripper head, as well as a plurality of guide elements 6.1-6.i + 1 which cooperate with the guide member or the guide structure to guide the rapier and / or the gripper head in the shed. In this case, the gripper belt and / or the gripper head in the shed as required for deviations down and / or with respect to deviations upwards and / or be guided laterally. In the inventive device is the beginning of the leadership of the guide member or the guide structure by the guide elements delayed until the hook tip 3 at least 14 cm wide or at least 18 cm, at least 24 cm or at least 30 cm wide in the shed 10, ie the guidance of the guide member or the guide structure by the guide elements is only one if the hook tip measured from the edge of the tray or leaf margin at least 14 cm, 18 cm, 24 cm or 30 cm far immersed in the shed.

In an advantageous embodiment, the beginning of the lateral guidance of the guide member or the guide structure 5 by the guide elements 6.1 - 6.i + 1 delayed until the hook tip at least 14 cm wide or at least 18 cm, at least 24 cm or at least 30 cm wide in Shed 10 is located. In a further advantageous embodiment, the beginning of the guidance of the guide part or the guide structure is delayed by the guide elements with respect to the lifting until the hook tip is at least 14 cm wide or at least 18 cm or at least 24 cm or at least 30 cm wide in the shed 10 ,

The gripper loom, in which the device 1 is used, may for example comprise a sley 9 and at the same a reed 8 for striking registered weft threads. Advantageously, the guide elements 6.1 - 6.i + 1, as in the FIGS. 2 and 3 shown, arranged and / or attached to the sley 9 of the rapier. Further, the rapier weaving machine may comprise a shed forming device, for example, as in FIG Fig. 2 shown a shedding device with strands 7a, 7b to lift a portion of the warp threads 12b and simultaneously lower another part 12 a and between the raised and lowered warp threads to form a shed 10.

In a further advantageous embodiment variant, the device 1 comprises a gripper belt 3b, a gripper head 3a and at least one guide part or guide structure 5 for a rapier 3 and / or gripper belt 4b, a gripper head 4a and at least one guide part or guide structure for a picker the guide member associated with the rapier or the corresponding guide structure relative to the hook tip 3 of the rapier by at least 14 cm, or at least 18 cm or at least 24 cm or at least 30 cm set back, and / or wherein the associated with the Holergreifer guide member or the corresponding guide structure relative to the hook tip 4 the picker is set back by at least 14 cm, or at least 18 cm or at least 24 cm or at least 30 cm.

In an advantageous embodiment, a profile is provided on or in the guide part or on or in the guide structure 5, for example, as in FIG Fig. 2 shown, a trapezoidal profile or a dovetail profile, wherein the guide elements 6.1 - 6.i + 1 are at least partially form-fitting manner to the profile of the guide member or the guide structure to the rapier band 3b and / or the gripper head 3a in the shed 10 by means of the profile and the Guide elements. Profiles which are arranged at the bottom of the rapier band and / or gripper head and which, like the trapezoidal profile or the dovetail profile, have sections which taper upwards have the advantage that not only lateral guidance or guidance with respect to deviations downwards is possible is, but also a guide against lifting up, without that the guide elements have to embrace the edge of the rapier band.

Advantageously, at least a portion of the guide elements or, as in the FIGS. 2 to 4 shown, all guide elements 6.1 - 6.i + 1 formed as a one-sided guide elements that guide the guide member or the guide structure 5 each on one side and / or support on one side. Advantageously, one-sided guide elements are respectively arranged on both sides of the guide part or the guide structure in order to guide the guide part or the guide structure on both sides and / or support it on both sides, for example by arranging the one-sided guide elements mutually.

In a further advantageous embodiment, the beginning of the guidance of the guide part or the guide structure 5 is delayed by the guide elements 6.1 - 6.i + 1 at most as long until the hook tip 3 50 cm wide or 40 cm or 30 cm wide in the shed, in particular from Tray edge or sheet edge measured 50 cm wide or 40 cm or 30 cm wide in the shed located.

Fig. 5 shows a further embodiment of a device according to the present invention. In the in Fig. 5 In the exemplary embodiment shown, the device 1 comprises a rapier band 3b movable in the entry direction, on the same a gripper head 3a and at least one guide part or guide structure 5, which are provided on the rapier band and / or on the gripper head, as well as a plurality of guide elements 6.1-6.3, which engage with the guide part or the guide structure cooperate to guide the rapier band and / or the gripper head in the shed. In this case, the gripper belt and / or the gripper head in the shed as required for deviations down and / or with respect to deviations upwards and / or be guided laterally. In this embodiment, the guide elements for guiding the guide part or the guide structure relative to the compartment edge, which normally coincides with the outermost Rietstäben the reed 8, offset by at least 10 cm or at least 12 cm or at least 16 cm inwards, so that in outermost 10 cm, 12 cm or 16 cm of the shed in the in Fig. 5 shown variant no guide elements are present. If required, guide elements can be provided in the outermost 10 cm, 12 cm or 16 cm of the shed, which merely support the gripper band and / or the gripper head, ie lead downwards with respect to deviations. In this case, as in Fig. 5 shown, the guide member or the corresponding guide structure 5 relative to the hook tip 3 be set back at least 14 cm, or at least 18 cm, at least 24 cm or at least 30 cm.

The in the FIGS. 2 to 5 shown and described above embodiments, forms and variants usually refer to a Bringergreifer. Of course, the illustrated and described embodiments, forms and variants can be used in a similar manner and with the same advantages for a Holergreifer.

An embodiment of the inventive method for entering a weft thread 2 in a shed 10 of a rapier will be described below on the basis of FIGS. 2 to 4 described. In the exemplary embodiment, the weft thread of a rapier head 3a, which is provided on a gripper belt 3b, taken and registered in the shed, for example by means of a thread clamp, which is provided in the gripper head. Furthermore, at least one guide part or a guide structure 5 are provided on the rapier band and / or rapier head, which cooperate with guide elements 6.1 - 6.i + 1 to guide the rapier band and / or the rapier head in the shed, wherein the guide member or the guide structure only then be guided by the guide elements when the hook tip 3 at least 14 cm wide or at least 18 cm or at least 24 cm or at least 30 cm wide in the shed, in particular from the edge or margin measured at least 14 cm wide or at least 18 cm or at least 24 cm or at least 30 cm wide in the shed. In this case, the gripper band and / or the gripper head in the shed as required for deviations down and / or with respect to lifting up and / or are guided laterally. In an advantageous embodiment, the guide member or the guide structure are guided by the guide elements laterally and / or with respect to the lifting only if the hook tip is at least 14 cm wide or at least 18 cm or at least 24 cm or at least 30 cm wide in the shed.

In a further advantageous embodiment, the weaving machine comprises a reed 8, which is provided on a sley 9 to strike a registered weft thread, wherein the guide member or the guide structure 5 are only then guided by the guide elements 6.1 - 6.i + 1, if the sley is in the rear resting position. In this case, the time at which the sley reaches the rear rest position substantially coincide with the beginning of the leadership of the guide member or the guide structure by the guide elements.

In a further advantageous embodiment variant, the weft thread 2 is picked up by a rapier head 3a of a rapier 3, which is provided on a rapier band 3b, and inserted into the shed 10 and / or taken over by a gripper head of a gripper rapier, which is provided on a rapier band conveyed. moreover At least one guide member or a guide structure 5 are provided on the rapier band and / or gripper head of Bringergreifers or Holergreifers, which interact with guide elements 6.1 - 6.i + 1 to guide the respective rapier band and / or the respective gripper head in the shed, said the guide member associated with the rapier or the corresponding guide structure relative to the hook tip 3 at least 14 cm, at least 18 cm, at least 24 cm or at least 30 cm back, and / or wherein the guide member associated with the Holergreifer or the corresponding guide structure relative to the hook tip of the Holergreifers by at least 14 cm, at least 18 cm, at least 24 cm or at least 30 cm back.

In an advantageous embodiment of the method, a profile is provided on or in the guide part or on or in the guide structure 5, for example a trapezoidal profile or a dovetail profile, the guide elements 6.1 - 6.i + 1 at least partially positively locking to the profile of the guide part or the guide structure be formed to guide the rapier and / or the gripper head in the shed by means of the profile and the guide elements.

Advantageously, at least a portion of the guide elements 6.1 - 6.i + 1 is formed as one-sided guide elements, which guide the guide member or the guide structure respectively on one side and / or supported on one side, wherein on both sides of the guide member or the guide structure each one-sided guide elements be arranged to guide the guide member or the guide structure on both sides and / or support, and wherein the one-sided guide elements, for example, as in the FIGS. 2 and 3 shown to be mutually arranged.

In a further advantageous embodiment of the method, the guide part or the guide structure 5 are guided at the latest by the guide elements 6.1 - 6.i + 1, when the hook tip 3 50 cm wide, or 40 cm or 30 cm wide in the shed, in particular from the edge of the tray or sheet edge measured 50 cm wide, or 40 cm or 30 cm wide in the shed.

A second embodiment of the method according to the invention will be described below with reference to FIG Fig. 5 explained. In the second embodiment, the weft thread is picked up by a rapier head 3a, which is provided on a rapier band 3b, and entered into the shed. Furthermore, at least one guide part or guide structure 5 is provided on the rapier band and / or rapier head, which interact with guide elements 6.1-6.3 to guide the rapier band and / or the rapier head in the shed, wherein the guide elements for guiding the guide part or the guide structure with respect to the Tray edge should be moved at least 10 cm or at least 12 cm or at least 16 cm inwards. In this case, as in Fig. 5 shown, the guide member or the corresponding guide structure relative to the hook tip 3 be set back by at least 14 cm, at least 18 cm, at least 24 cm or at least 30 cm.

The above description of the embodiments, forms and variants of the inventive method usually refers to a Bringergreifer. Of course, the described embodiments, forms and variants can be used in a corresponding manner and with the same advantages for a Holergreifer.

Furthermore, the invention comprises a rapier loom with a device 1 according to one of the above-described embodiments and forms and / or equipped for carrying out a method according to the above description.

In an advantageous embodiment gripper loom comprises a sley 9 with reed 8 for striking a registered weft thread, wherein the beginning of the leadership of the guide member or the guide structure 5 by the guide elements 6.1 - 6.i +1 is not before the time in which the sley the has reached the rear rest position. Here, the beginning of the leadership of the guide member or the guide structure by the guide elements substantially coincide with the time at which the sley has reached the rear rest position. To control the device for entering a Weft thread and in particular the gripper movements and to control the loading movement, one or more control devices may be provided, which control the gripper movements and the loading movement, for example, such that the beginning of the leadership of the guide member or the guide structure by the guide elements substantially at the time in which Batten reaching the rear rest position coincides.

Fig. 6 shows a graphical representation of the gripper movement for an embodiment of the present invention. In this embodiment, the apparatus comprises a rapier and a picker for inserting a weft thread and the rapier loom comprises a reed 8. In the in Fig. 6 The diagram shown is the path 13 of the excising tip 3 and path 14 of the picker tip 4 drawn in a full weave cycle. In this case, the distances traveled are recorded in the direction of the abscissa and in the direction of the ordinate of the machine angle. By the reference numeral 11, the width of the reed 8 is designated. This usually corresponds to the width of the shed. On both sides of the reed 8 is in each case an outer region with a width x, which corresponds to the distance in the shed, which covers the respective gripper in the inventive device until the relevant guide member or the relevant guide structure are guided by the guide elements.

In addition, three positions 3 ', 3 ", 3"', 4 ', 4 ", 4''' of the rapier and the taker rapier are drawn in the diagram, and position 3 'shows the rapier when registering the weft, position 3". shows the Bringergreifer in the retreat after the transfer of the weft thread and position 3 '''shows the Bringergreifer outside the shed just before reaching the reversal point. Position 4 'shows the taker when feeding in the shed, position 4 "shows the taker after taking over when entering the weft and position 4''' shows the taker outside the shed just before reaching the turning point.

On the same sheet as Fig. 6 can be found in the FIGS. 7A and 7B two more graphic representations. It shows Fig. 7A a graphic representation of the loading movement for a conventional device for entering a weft thread and Fig. 7B a graphical representation of the loading movement for an embodiment according to the present invention. The graphic representations of the store movement are so under the in Fig. 6 shown graphical representation of the gripper movement arranged in the FIGS. 7A and 7B Shop movements shown synchronous to those in Fig. 6 shown gripper movements run. This corresponds to the actual conditions in a rapier loom, in which the gripper movements and the loading movements are controlled synchronously.

In the diagram of the loading movement of a conventional device for introducing a weft thread, which in Fig. 7A is shown, the batten is in the rest position 9a when the hook tips have reached the outer edge of the reed or immerse in the shed. The batten remains in the rest position during weft insertion until the hook tips have reached the outer edge of the reed during retraction or leave the shed. From this time, the batten performs a stop movement to strike the registered weft thread by means of a reed, which is provided on the batten. For the loading movement from the rest position 9a to the stop position 9b and back again, only a comparatively small area of the machine angle is available, which corresponds to the area during which the grippers are located outside the shed in the conventional device.

In the graphic representation of the loading movement for an embodiment according to the present invention, the batten is in the rest position 9a when the hook tips have traveled a certain distance x along the reed or are immersed accordingly far into the shed. The sley remains in the rest position during the weft insertion until the looper tips have reached the outer area of the reed, which corresponds to the distance x, during retraction or have approached the edge of the compartment up to the distance x. From this point, the batten performs a stop movement to the registered weft by means of a reed, which is provided on the batten to strike. For the loading movement from the rest position 9a to the stop position 9b and back again is compared to the conventional device, a significantly larger area of the machine angle available, which corresponds to the area during which the guide member and / or the guide structure in the embodiment outside the range of the guide elements that is, during which the guide part and / or the guide structure are not guided.

The longer machine angle range, thanks to the device according to the invention and thanks to the method according to the invention, makes it possible to carry out the loading movement less abruptly, whereby the bearings and drive parts of the sley can be spared or made lighter. The device, the method and the gripper loom according to the above description combine the advantages of guiding the rapier band and / or gripper head in the shed with the advantages of a gentle loading movement.

Claims (15)

Device for introducing a weft thread (2) into a shed (10) of a rapier weaving machine, wherein the device (1) has a rapier band (3b, 4b) which can be moved in the entry direction, at the same a gripper head (3a, 4a) and at least one guide part or a guide structure (5), which are provided on the rapier band and / or on the gripper head, as well as a plurality of guide elements (6.1 - 6.i + 1), which cooperate with the guide member or the guide structure to guide the rapier band and / or the gripper head in the shed , characterized in that the beginning of the guidance of the guide part or the guide structure is delayed by the guide elements until the gripper tip ( 3 . 4 ) is at least 14 cm wide, in particular at least 18 cm or at least 24 cm wide in the shed (10). Apparatus according to claim 1 comprising a rapier band (3b), a rapier head (3a) and at least one guide part (5) or a guide structure (5) for a rapier (3) and / or a rapier band (4b), a rapier head (4a) and at least one guide part or a guide structure for a picker gripper (4), wherein the guide part associated with the picker or the corresponding guide structure with respect to the picker tip (4) 3 ) of the Bregergreifers is set back by at least 14 cm, in particular at least 18 cm or at least 24 cm, and / or wherein the the Holergreifer associated guide member or the corresponding guide structure relative to the hook tip ( 4 ) of the taker rapier is set back by at least 14 cm, in particular at least 18 cm or at least 24 cm. Device according to one of claims 1 or 2, wherein the guide elements (6.1 - 6.i + 1) for guiding the guide part or the guide structure (5) relative to the compartment edge by at least 10 cm are offset inwards, in particular at least 12 cm or at least 16 cm are offset inwards. Device according to one of claims 1 to 3, wherein on or in the guide member or on or in the guide structure (5) a profile is provided, in particular a trapezoidal profile or a dovetail profile, and wherein the guide elements (6.1 - 6.i + 1) at least are partially formed positively to the profile of the guide member or the guide structure to guide the rapier (3b, 4b) and / or the gripper head (3a, 4a) in the shed by means of the profile and the guide elements. Device according to one of claims 1 to 4, wherein the beginning of the leadership of the guide member or the guide structure (5) by the guide elements (6.1 - 6.i + 1) is delayed at most so long until the hook tip ( 3 . 4 ) 50 cm wide, especially 40 cm or 30 cm wide in the shed. Method for introducing a weft thread (2) into a shed (10) of a rapier loom, in which - The weft thread (2) of a rapier head (3a, 4a), which is provided on a gripper belt (3b, 4b) is received and entered into the shed; - At least one guide member or a guide structure (5) are provided on the rapier band and / or gripper head, which cooperate with guide elements (6.1 - 6.i + 1) to guide the rapier band and / or the gripper head in the shed; characterized, - That the guide member or the guide structure are guided by the guide elements only when the hook tip ( 3 . 4 ) has moved at least 14 cm wide, in particular at least 18 cm or at least 24 cm far into the shed. A method according to claim 6, wherein the weaving machine comprises a reed (8) provided on a sley (9) for striking an inserted weft thread; and wherein the guide member or the guide structure (5) are guided by the guide elements (6.1 - 6.i + 1) only when the sley is in the rear rest position (9a). A method according to claim 7, wherein the time at which the sley (9) reaches the rear rest position (9a) substantially coincides with the start of the guidance of the guide member or guide structure by the guide members. Method according to one of claims 6 to 8, wherein - The weft thread (2) of a rapier head (3a) of a Bringergreifers (3a), which is provided on a gripper belt (3b) is received and inserted into the shed and / or by a rapier head (4a) of a Holergreifers (4), which is provided on a gripper belt (4b), taken over and forwarded; - At least one guide member or a guide structure (5) are provided on the rapier and / or gripper head of the Bringergreifers or the Holergreifers, which interact with guide elements (6.1 - 6.i + 1) to the respective rapier band and / or the respective gripper head in To guide the shed; and - Wherein the guide claw associated with the guide member or the corresponding guide structure relative to the hook tip ( 3 ) of the Bregergreifers is set back by at least 14 cm, in particular at least 18 cm or at least 24 cm, and / or wherein the Holergreifer associated guide member or the corresponding guide structure relative to the gripper tip ( 4 ) of the taker rapier is set back by at least 14 cm, in particular at least 18 cm or at least 24 cm. Method according to one of claims 6 to 9, wherein the guide elements (6.1 - 6.i + 1) for guiding the guide part or the guide structure (5) relative to the tray edge are offset by at least 10 cm inwards, in particular at least 12 cm or at least 16 cm are moved inwards. Method according to one of claims 6 to 10, wherein on or in the guide part or on or in the guide structure (5) a profile is provided, in particular a trapezoidal profile or a dovetail profile, and wherein the guide elements (6.1 - 6.i + 1) at least partially form-fitting to the profile of the guide member or the guide structure are formed to guide the rapier and / or the gripper head in the shed by means of the profile and the guide elements. Method according to one of claims 6 to 11, wherein the guide member or the guide structure (5) at the latest by the guide elements (6.1 - 6.i + 1) are guided when the hook tip ( 3 . 4 ) 50 cm wide, especially 40 cm or 30 cm wide in the shed. Rapier weaving machine with a device (1) according to one of claims 1 to 5 and / or equipped for carrying out a method according to one of claims 6 to 12. Rapier weaving machine according to claim 13, comprising a sley (9) with reed (8) for striking a registered weft thread, wherein the beginning of guiding the guide part or the guide structure (5) by the guide elements (6.1 - 6.i + 1) not before the time lies, in which the batten has reached the rear rest position (9a). Rapier weaving machine according to claim 14, wherein the start of the guidance of the guide part or the guide structure by the guide elements coincides substantially with the time at which the sley has reached the rear rest position (9a).

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