EP2668323B1 - Weaving machine having movable limiting means - Google Patents

Description

The present invention relates to a weaving machine for producing a fabric with shedding means for alternately lifting and lowering of warp material for forming a shed, with arranged in a weft insertion position fixed weft insertion means in the warp to insert a preferably band-shaped weft material in the shed, and with withdrawal means for removing the finished Goods in a deduction direction. Furthermore, means for goods movement in the warp direction are provided, by means of which the edge of the goods in a goods movement range between a downward starting position and an upward pick-up position is reciprocable to bring in the pick-up the last registered shot material with the edge of the goods in contact.

In the prior art, a large number of different solutions have already been presented for the individual steps in the weaving process, such as, for example, the shed formation, the weft insertion and stop as well as the fabric removal or the corresponding assemblies. However, the known solutions are often not suitable for the production of woven fabrics from strip-shaped materials. Thus, in the case of band-shaped or reinforcing-fiber-containing materials which have a lower flexibility than conventional thread-like materials, deformations may occur due to handling devices of the weaving machine and as a consequence to damage of the band material. In the case of ribbon-shaped weft materials, a wave formation in the weft direction may occur due to their width, which makes the formation of flat fabrics more difficult. Likewise, when using band-shaped materials as weft material, a conventional weft stop by means of a reed is not possible because of these damages and deformations would cause on the band-shaped weft material. On the other hand, without a stopper, no regular, dense tissue can be produced.

The JP 2003-253547 A1 therefore proposes to use a fabric movement for tissue formation instead of a conventional weft stop. For this purpose, a pair of rollers is provided, between which the edge of the already finished fabric is clamped. After the weft insertion, the pair of rolls with the clamped edge of the fabric is moved counter to the withdrawal direction to the newly entered weft material in order to bring it into contact with the fabric edge of the fabric. By rotation of the rollers enters the last registered weft material between the two rollers of the roller pair and is clamped by this. Subsequently, the pair of rolls with the newly created, clamped edge of the fabric is moved back to the starting position. Since at the same time the clamping of the original edge of the fabric is canceled during the rotation of the rollers for clamping the last registered weft material, it may also come here to gaps in the fabric or an insufficient weft density. Furthermore, damage to the weft material can occur due to the rollers.

Object of the present invention is therefore to propose a weaving machine, which reduces the risk of damage to the weft material.

The object is solved with the features of the independent claim.

A loom for producing a fabric includes shedding means for alternately lifting and lowering of warp material for forming a shed, in the warp direction fixed in a weft insertion zone arranged weft insertion means for introducing a preferably band-shaped Weft material and withdrawal means for removing the finished product in a withdrawal direction. The weft insertion zone is defined here by the stationarily arranged weft insertion means or the leading and trailing edges of a ribbon-shaped weft material that has just been introduced. Furthermore, means for goods movement in the warp direction are provided, by means of which the edge of the goods in a goods movement range between a downward starting position and an upward pickup position is reciprocated to bring in the pick-up the last registered shot material with the edge of the goods in contact and a To achieve a vocation. In the context of the present application, the terms relate upwards and downwards in each case to the take-off direction, so that correspondingly the downward starting position is closer to the goods removal means than the upward pick-up position.

According to the invention further upper and lower in the warp direction movable limiting means are provided, which limit the shedding caused by the shedding means opening of the shed and which within a Begrenzungsmittelbewegungsbereichs back and forth between an upward and a downward end position and are movable. The product or the warp material is guided between the upper and lower limiting means in the direction of the withdrawal means. The limiting means are in this case at least in the movement against the withdrawal direction without jamming, i. without actively acting contact on the goods and a last registered shot material movable. The limiting means surround the last registered shot material or the goods thus only loosely, so that they protect the weft material in a particularly gentle way from undesirable deformations.

In a corresponding method for producing a woven fabric on a weaving machine, in which formed by shedding means a shed is introduced, a preferably ribbon-shaped weft material by warp in stationary, defining a weft insertion zone weft insertion in an open shed, and a fabric edge of the finished fabric is moved to a pick-up position to bring the weft material with the edge of goods in contact, it is provided that top and lower limiting means are moved from a downward end position counter to the withdrawal direction into an upward end position, wherein the limiting means are moved without jamming without active contact to the goods or the last shot material inserted over the goods or the weft material. In the upward end position, the weaving shed opening by the action of the shed forming means is limited by the limiting means, with the last inserted weft material being between the limiting means, and subsequently the edge of the newly inserted weft material newly formed and the limiting means become substantially synchronously with each other moved back to the starting position or the downward end position.

Damage to the weft material, which could arise in the prior art when pulling the last registered weft material in the clamping region of the two rollers are avoided according to the invention in that at least during the movement against the withdrawal direction or during a relative movement between the goods and the last registered shot material and the limiting means no active clamping and thus no direct contact is provided, but the goods or the edge of the goods and the last registered shot material are only loosely surrounded by the limiting means. The movement of the limiting means on the goods and on the last registered shot material is thus largely contactless, while in the prior art, a fixed clamping of the weft material or a clamping was provided. By limitation means in the context of this invention means are meant by which the distance of the warp material in the compartment opening direction can be limited at least in the region of the edge of the fabric. At the same time, a deleterious effect of the warp threads on the last inserted weft material is prevented by the limiting means which limit the opening of the shed which is predetermined by the shedding means. Characterized in that the last registered shot material is between the limiting means and a propagation of the opening of the shed is prevented by the limiting means, the last registered shot material remains in a straight, extended state and can not be deflected by the warp threads. The limiting means in this case protect the newly entered weft material against deformation by the opening shed until it is picked up by the contact with the previous edge of goods from the weft insertion zone and transported away in the direction of the withdrawal device. A wavy deformation of the weft material still present in the weft insertion zone, which prevents the production of a desired flat fabric and also causes further damage to the weft material or the fabric, can thus be avoided.

According to an advantageous embodiment of the invention in this case the Begrenzungsmittelbewegungsbereich is different from the goods movement range, preferably greater than the goods movement range executed. This makes it possible, for example, to place the last inserted weft already completely between the upper and lower limiting means and thus to protect, before it is moved in the withdrawal direction.

It is also particularly advantageous if the limiting means by means of a separate drive regardless of the goods movement means in Can be driven in the warp direction. This allows a high flexibility of the movements and offers the possibility to support the Vertuchung, so the "shot stop", as well as adjust the weft density of the goods by an appropriate control of the movements.

An advantageous development provides that the limiting means are first moved substantially synchronously with the movement of the edge of the goods from the starting position to the pick-up position from its downward end position into an upward intermediate position. Only after the edge of the goods has reached the picking position, the limiting means are moved to the upward end position, wherein the limiting means are moved in the warp direction over the last shot material entered. Subsequently, the edge of the fabric and the limiting means are moved substantially synchronously with one another in the drawing-off direction back into the starting position or the downward end position. The last registered, initially still in the weft insertion zone located shot material is thus only picked up or moved in the withdrawal direction when it is completely between the limiting means and thus protected from deformation and damage. In a correspondingly designed loom, the weft insertion zone is thus substantially within the boundary means movement range.

Likewise, it is possible according to another embodiment of the invention that the weft insertion position is substantially outside the Begrenzungsmittelbewegungsbereichs. In a corresponding method, the limiting means are first moved substantially synchronously with the movement of goods from the starting position to the pick-up position from the downward end position to the upward end position. Subsequently, the goods movement is already started back to the starting position, wherein the last registered shot material between the limiting means is withdrawn. Only after the last inserted weft material is completely retracted between the limiting means, the limiting means are moved synchronously with the edge of the goods from its upward end position in the withdrawal direction back to the downward end position.

To the diversification, d. H. the joining of the last registered shot material with the previous edge of the goods to support, it is also advantageous if the edge of the fabric after he has reached the picking position, is held in a temporary standstill and only then moved back to the starting position. In a loom according to the invention, the goods movement means in the pick-up position are correspondingly durable in a temporary standstill.

Advantageously, the limiting means may be maintained in one or more arbitrary positions within the limiting means movement range in a temporary standstill. For example, in order to assist the alignment, it is advantageous for the limiting means to be durable in a temporary position located substantially downwards of the weft insertion zone and / or in the upward end position in a temporary standstill. In a corresponding method, the limiting means in the intermediate position or in the upward end position are advantageously kept in a temporary standstill during the product standstill.

A further improvement of the Vertuchung can also be achieved if after closing the closed or already reopening shed is held in a temporary shutdown or the movement of the warp material is kept in the shed opening direction in a temporary standstill, at least until the limiting means their Have reached upward end position and / or the last registered shot material has passed between the limiting means. In an advantageous embodiment of the weaving machine according to the invention, a temporary standstill, ie a temporary stoppage of the movement of the warp material in the compartment opening direction, is made possible according to the technical standard. This makes it possible to spend the last registered weft material still in the field, possibly already tied off easily, in the protection zone between the limiting means and thus to protect at any time before a deflection and undulating deformation. According to an advantageous embodiment of the invention, the shedding means for this purpose shafts with elongated Litzenaugen, so that no interference with the continuous movement of the shedding means are required. The Litzenaugen are hereby extended so that there is a shutdown for at least 1/36 the duration of a weaving cycle.

According to another advantageous embodiment of the invention, the weft material after the weft insertion as long as both sides of the warp material clamped in clamps until it completely, d. H. has passed over its entire width to its trailing edge between the limiting means. The weft material can thereby be protected at any time before deformation by the warp material.

An advantageous embodiment of the invention provides that the limiting means comprise two strips extending in the weft direction. These can be designed as mutually fixed strips and surround the weft material thus at any time only loose.

However, it may also be advantageous if, during the movement of the limiting means back into the downwardly located end position, the last inserted weft material is clamped between the limiting means becomes. In a corresponding weaving machine, the limiting means are designed as clamping means. The limiting means for this purpose have two strips extending in the weft direction, wherein at least one of the strips is movable in the vertical direction in order to clamp the weft material. The weft material is thus positively clamped during the entire tissue formation and its transport in the withdrawal direction and protected against deflection and wave formation.

It is also advantageous if the spacing of the strips is adjustable in order to allow adaptation to the thickness of the processed material or the resulting fabric. In this way, at any time an optimal adjustment in terms of the most effective limitation of the warp threads on the one hand and a conservation of the fabric or the weft material by avoiding a direct contact and a clamp on the other hand can be made. It is particularly advantageous if the vertical spacing of the strips is adjustable during weaving operation. As a result, an adjustment is possible at any time, without interrupting the process. In a method for producing a fabric, for example, it is advantageous if the distance of the limiting means during the movement of the limiting means is reduced after reaching the upward end position. As a result, a particularly good protection of the last registered weft material can be ensured in a gentle manner, with no risk of damage to the goods by a direct, clamping contact.

According to a particularly advantageous embodiment of the invention, a further in the warp direction between a front and a rear end position movable reed is provided, wherein the front end position of the reed relative to the withdrawal direction upwards or behind a trailing edge of the last registered, located in the weft insertion zone Shot material is or has just reached. As a result of this limited blade movement, after the weft insertion and before or during the movement of the goods into the picking position, a trailing edge of the last inserted weft material is aligned in the weft direction, if this assumes a curved course or is not in the weft direction. Damage to the weft material are still avoided by the limited range of action of the blade stop.

Furthermore, it is advantageous if the function or the movement of the limiting means and the correct removal of the weft material from the weft insertion zone is monitored by means of suitable sensors in order to avoid collisions with the weft insertion means and defects in the tissue formation.

Fig. 1

eine schematische Darstellung einer erfindungsgemäßen Webmaschine mit Warenbewegungsmitteln und Begrenzungsmitteln,

Fig. 2

eine Detaildarstellung von Begrenzungsmitteln, welche als Klemmmittel ausgebildet sind,

Fig. 3

eine Darstellung eines Verfahrens zum Herstellen eines Gewebes nach einer ersten Ausführung der Erfindung,

Fig. 4

eine Darstellung einer Abwandlung des Verfahrens der Figur 3 mit einer Klemmung des Ware,

Fig. 5

eine Darstellung eines Verfahrens nach einer alternativen Ausführung der Erfindung,

Fig. 6

eine weitere Darstellung eines Verfahrens sowie einer erfindungsgemäßen Webmaschine in einer schematischen Draufsicht.

Further advantages will be described with reference to the embodiments illustrated below. Show it:

Fig. 1

a schematic representation of a weaving machine according to the invention with goods movement means and limiting means,

Fig. 2

a detailed representation of limiting means, which are designed as clamping means,

Fig. 3

a representation of a method for producing a fabric according to a first embodiment of the invention,

Fig. 4

a representation of a modification of the method of FIG. 3 with a clamping of the goods,

Fig. 5

a representation of a method according to an alternative embodiment of the invention,

Fig. 6

a further illustration of a method and a loom according to the invention in a schematic plan view.

Fig. 1 shows a loom 1 according to the invention in a schematic side view. The weaving machine 1 includes in a known manner a warp beam 2, from which a warp material 3 is provided, shedding means 4 for forming a shed 5 and weft insertion means 6 (not shown here, see Fig. 6 Alternatively, the warp material may also be provided by a gate having a plurality of warp coils from which the warp material is peeled off. Furthermore, take-off means 8 for removing the finished product 9 in a withdrawal direction AR (symbolized in the present case by an arrow) are provided. The warp material 3 can be designed in a conventional manner thread-like or else band-shaped. The warp material 3 is guided by the warp beam 2 in a conventional manner via a coating tree 10 through the Litzenaugen 11 of the shedding means 4, which are presently designed as shanks, and which form the shed 5 by changing lifting and lowering of the warp material. The warp material 3 converges in the binding point 12 of the fabric, from where the finished product 9 is fed to the withdrawal means 8 via a breast tree 13. The weft insertion means 6 are arranged stationary with respect to the warp direction and define a weft insertion zone 14, the width of which with respect to the warp direction in each case corresponds to the width of the weft material used.

Since tape-shaped weft materials 7 would be damaged by a conventional weft stop, it is provided to effect a Vertikung by a movement of goods. For this purpose, in closing shed 5 by goods movement means 10, 13 of the fabric edge 12 against the withdrawal direction AR in the direction of still located in the weft insertion zone 14 shot material 7 moves to connect the weft material 7 with the goods. The means 10, 13 for movement of goods are presently formed by the breast tree 13 and the coating tree 10, which are synchronously reciprocable in the warp direction and forth, as indicated by the dashed line and the double arrows. However, the means 10, 13 for goods movement could also be formed by reversible discharge means 8 in conjunction with a reversible drive for the warp beam 2. Furthermore, a movement of the fabric edge 12 could also be realized by a superposition of a movement of the breast tree 13 and the coating tree 10 on the one hand and the discharge means 8 on the other.

In the present case, the edge of the fabric 12 is in its starting position AG, which is downwardly in relation to the withdrawal direction AR, and is movable counter to the withdrawal direction AR into an upwardly disposed collection position AH, where it is brought into contact with the last inserted weft material 7. After the last registered weft material 7 is connected to the goods 9 and tied, the goods movement means 13, 10 are moved in the withdrawal direction back to its initial position shown in solid lines, wherein the newly inserted at the trailing edge of the last shot material 7 fabric edge 12 back to the starting position AG is spent, and the product 9 is withdrawn in a known manner.

Another problem in the processing of band-shaped weft materials 7 is a wave-shaped deformation of the weft material. 7 This wave formation not only hampers the formation of a desired uniform and flat fabric 9, but can also lead to problems and damage, in particular of the protruding weft material 7, in further processing or withdrawal of the fabric. The wave-shaped deformation further leads to a pulling in of the band-shaped weft material 7 from the two lateral fabric edges in the direction of fabric center, so that the formation of the lateral goods finish is impaired. According to the present invention, therefore, upper and lower limiting means 16 are provided, between which the warp material or the finished product 9 is guided to the take-off means 8. According to the invention, the limiting means 16 are reciprocable in the warp direction between an upward end position EP2 and a downward end position EP1 and are thereby able to project the last inserted weft material 7 already in the weft insertion zone 14 and during its entire removal from the weft insertion zone 14 an undesirable deflection by the warp material 3 and damage to protect. It is particularly advantageous in this case that at least the movement of the limiting means 16 against the withdrawal direction AR, ie the "picking" of the weft material 7 without jamming, ie essentially without direct contact with the weft material 7 and the goods 9, so that the risk of damage of the weft material 7 is reduced.

The fact that the goods movement means 10, 13 and the limiting means 16 are formed as independent assemblies, for example, as well as Fig. 1 As can be seen, the limiting-device moving range extending between the up-and-down end positions EP1 and EP2 is made larger than the goods moving range WB. Thus, the limiting means 16 can be moved directly into the weft insertion zone 14, to pick up the registered shot material 7 there. Further, if the limiting means 16 is preferably by means of a separate drive 21 (see Fig. 6 ) can be driven independently of the goods movement means 10,13, so the movements can be particularly flexible adapted to the particular shot material used 14 and other conditions. In particular, a completely independent timing of the movements of the goods movement means 13 and 10 and the limiting means 16 is possible. This can be achieved in an advantageous manner that the edge of the fabric 12 is securely held and guided by the goods movement means 13, 10, while at the same time already the weft material 7 is protected between the upper and lower limiting means 16. Also, a gap formation in the tissue can thereby be largely avoided.

A representation of a method for producing a fabric and the movement of the limiting means 16 and the goods movement means 13, 10 is in Fig. 3a - 3e shown in a schematic side view.

Fig. 3a shows here the situation of the goods movement means 13 and the limiting means 16 immediately after the weft insertion. Relative to the main shaft of the loom 1, a situation at about 290 ° machine angle is shown. The shed 5 is just open at this time or begins to close. The band-shaped weft material 7 has been introduced by weft insertion means 14, for example a gripper, and is now located in the weft insertion zone 14. The edge 12 (and accordingly the goods movement means 13, 10) is located in the downward starting position AG and the limiting means 16 at this time are in their downwards end position EP1. Furthermore, a reed 15 is shown, whose function will be explained at a later time.

After the weft insertion now begins essentially at the same time a movement of the goods 9 or the edge of the goods with the goods movement means 13, 10 and a movement of the limiting means 16 until the edge of the fabric 12 has reached the upward pick-up position AH. This situation is in Fig. 3b and is achieved for example at about 330 ° - 340 ° machine angle. The shed 5 is still open at this time about one-third. Furthermore, in Fig. 3b It can be seen that the article 9 contacts the edge 12 of the last inserted weft material 7 as soon as the edge 12 of the article is in the picking position AH, so that the connection of the weft material 7 with the finished article 9 can take place through the following adjustment. The limiting means 16 are at this time in an intermediate position ZP, which connects downstream of the weft insertion zone 14 to this. According to a particularly advantageous embodiment, the intermediate position ZP overlaps slightly with the weft insertion zone 14, so that the limiting means 16, as illustrated here, are located shortly behind the front edge 17 of the last inserted weft material 7 with respect to the withdrawal direction AR.

The edge of the fabric 12 located in the pick-up position AH is now held in a temporary standstill in order to allow the diversification. It is particularly advantageous in this case if, during the goods standstill, the limiting means 16 in the intermediate position ZP are temporarily held in a temporary standstill in order to support the diversification. The limiting means 16 are then further moved from the intermediate position ZP counter to the withdrawal direction AR in the direction of their upward end position EP2, as indicated by the arrow in the Fig. 3c indicated. Fig. 3c This shows the situation shortly after closing the shed 5, which takes place at about 350 ° machine angle.

In Fig. 3d Finally, the limiting means 16 have reached their upward end position EP2, in which the last-entered shot material 7 is completely, that is, over its entire width between the limiting means 16. The weft insertion zone 14 thus lies substantially within the boundary means movement area BB. After the limiting means 16 have reached their upward end position EP2, the shed 5 begins to open again, wherein the now completely between the limiting means 16 located shot material 7 is protected from undesired deflections and damage by the warp material 3. The limiting means 16 have reached their upward end position EP2 at about 370 ° or 10 ° machine angle.

According to the present embodiment of the invention, the opening of the shed 5 after reaching the Fachschlusses (see Fig. 3c ) is delayed by maintaining the closed shed 5 in a temporary standstill until the limiting means 16 have reached their upward end position EP2. Undesirable effects of the weft material 7 by the warp material 3 can thereby be avoided in an advantageous manner already at a time at which the weft material 7 is not yet completely in the protection zone between the limiting means 16.

After the limiting means 16 have reached their upward end position EP2, the movement of the fabric edge 12 with the fabric 9 in the withdrawal direction AR back to the starting position AG begins substantially simultaneously with each other, and the movement of the limiting means 16 back into the downward end position EP1, what a Fig. 3e is shown in dashed lines. Fig. 3e shows the situation shortly after the start of the movement back to the starting position AH and the end position EP1, which starts at about 20 ° machine angle.

After the movement of the fabric edge 12 and the limiting means 16 is completed in the withdrawal direction AR and a withdrawal of the fabric 9 is done, the cycle of movement is completed and begins with the entry of the next shot material 7 again. The previously last registered shot material 7 is still completely between the limiting means 16 and now forms the new edge of the product 12th

To that Fig. 3c shank or shedding means 4 are provided with enlarged Litzenaugen 11 according to the present embodiment of the invention, as described in Fig. 1 indicated schematically. In this way, conventional shedding means 4 can be used, wherein the loom 1 or a drive of the shedding means 4 can continue to run continuously. Likewise, however, it is also possible to realize the temporary standstill in the specialist area by a special cam drive of the shafts 4 or other specially trained shedding means 4. As a particularly advantageous for the movement and to avoid a wave-shaped deformation of the weft material 7, a shutdown has an interval of at least 10 ° machine angle, preferably between 20 ° - 50 ° machine angle proven. As a result, the weft material 7 can reach the limiting means 16 exactly over its entire width.

As already described, the Vertuchung by the movement of goods and the compartment boundary can be done very gently, since during the relative movement between the goods 9 and the weft material 7 and the limiting means 16 no clamping and thus no direct contact takes place.

In order to keep the weft material in a straight and extended state and to protect against deformations in the horizontal direction and retraction in the direction of the fabric center, may also be provided to clamp the weft material 7 during the removal from the weft insertion zone 14 in the limiting means 16. The limiting means 16 are designed for this purpose as a clamping means. Such a method is in FIG. 4 shown. Since the procedure of FIG. 4 essentially that of FIG. 3 In the following, only the differences concerning the additional clamping will be discussed.

In Fig. 4d and 4e In this case, it can be seen that the upper limiting means 16 can be acted upon correspondingly, the clamping beginning as soon as the limiting means 16 have reached the trailing edge 18 of the last inserted shot material 7 ( Fig. 4d ). The clamping of the weft material is symbolized by an arrow. After reaching the downward end position EP1 of the limiting means 16, but at the latest before the renewed movement of the limiting means 16 against the withdrawal direction AR, the clamping is finally released again.

Fig. 5 shows another embodiment, wherein the weft insertion zone 14, in contrast to the in Fig. 3 shown representation substantially outside the Begrenzungsmittelbewegungsbereichs BB. The upward end position EP2 is thus compared to the end position EP2 of FIG. 3 a little further down or slightly further forward in relation to the withdrawal direction AR. The procedure is similar to that in Fig. 3 described so that in the following only the differences from the above-described procedure will be discussed.

As well as under Fig. 3a and 3b described after the weft insertion ( Fig. 5a ) a substantially synchronous movement of the edge of the goods 12 and the limiting means 16 until the edge of the fabric 12 has reached the picking position AH ( Fig. 5b ). At the same time reach the limiting means 16 in its upward end position EP2, so that according to this embodiment of the invention, the goods movement range WB and the Begrenzungsmittelbewegungsbereich BB are substantially equal. Again, it may be advantageous if the edge of the fabric 12 is held in the collection position AH in a temporary standstill in order to improve the setting of the weft material 7 and the Vertuchung.

After the technical college and the successful setting of the last registered shot material 7, which in Fig. 5c are shown, the limiting means 16 are held in their upward end position EP2 in a temporary standstill and the goods movement in the withdrawal direction AR back to the starting position AG started. The last registered shot material 7 is thereby drawn between the standing limiting means 16, as in Fig. 5d represented by the arrow. Meanwhile, the shed 5 already starts to open again. It is thus particularly advantageous also in this embodiment to provide a technical standstill in the specialist over a certain interval to protect the weft material 7 before its complete entry into the protection zone between the limiting means 16 in front of the opening shed 5.

After the weft material 7 is retracted over its entire width between the limiting means 16, and the limiting means 16 are thus located just behind the trailing edge 18 of the weft material 7 ( Fig. 5e ), finally sets the movement of the limiting means 16 back to its downward end position EP1, which preferably takes place synchronously with the movement of goods 9. Possibly. Here again, similar to the embodiment shown in Figure 4, a clamping of the weft material 7 is provided be. Once the limiting means 16 have reached their downwards end position EP1 and the goods movement means 13 have reached their starting position AG and the goods have been removed, the cycle of movement is completed and the shed 5 is opened for the next weft insertion.

Fig. 2 shows a detailed representation of limiting means 16, which are designed as clamping means. The limiting means 16 in this case each comprise two strips 19 extending in the weft direction, wherein the upper strip 19a is designed as a spring plate and can be acted upon by an actuator 20. Depending on the design of the actuator 20, it is possible in an advantageous manner to freely set the time of clamping and thereby make the movements particularly flexible. The lower bar 19b is in contrast designed as a fixed bar 19. Likewise, it is of course also possible to apply both strips 19a and 19b by means of corresponding actuators 20.

According to a modification, not shown may also be provided, also a distance d of the two strips by means of an actuator 20, for example by means of a servo motor to perform adjustable. This makes it possible to adjust the distance d between the two strips 19 targeted during the process and thereby make an adjustment to the weft material used 7 and the warp material 13 and the conditions in the weaving process. Likewise, it is of course also possible to provide an adjustment of the distance d only manually, for example by means of a spindle or by spacers. Such an adjustment of the distance d is of course also used with fixed strips 19 and advantageous. To minimize any possible contact between the strips 19 and the weft material 7, the friction and damage To prevent further, the insides of the strips 19 may be provided with a low-friction surface.

Fig. 6 finally shows a schematic plan view of a loom 1, wherein substantially the area from the weft insertion zone 14 to the breast tree 13 is shown. Furthermore, the limiting means 16 can be seen, which are movable in a linear guide 25 by means of a suitable drive 21 in the warp direction. If the drive of the limiting means 16 as shown here by means of a separate servo motor 21, the movements can be designed very flexible and, for example, to the width of the weft material 7 used and the movement of the goods movement means 10, 13 are tuned. Thus, for example, the movement of the goods movement means 10, 13 and the limiting means 16 in the withdrawal direction can take place completely synchronously, in order to protect the last inserted weft material 7 from the weft insertion zone 14 during the entire removal. Relative movements between the limiting means 16 and the goods 9 or the last registered shot material 7 can thereby be completely avoided and thus a particularly gentle removal of the last registered shot material 7 can be ensured. Likewise, however, the movement of the limiting means 16 and the goods movement means 10, 13 also take place asynchronously, to achieve either a certain delay in the fabric 9 or to push the tissue closer together and thereby achieve a greater shot density.

As in Fig. 6 Furthermore, as a result of the contact of the weft material 7 on the warp material 3 and the movement of the goods against the take-off direction AR, an arcuate orientation of the weft material 7 in the weft insertion zone 14 may occur. The result not only in unwanted gaps and uneven appearance, but can also hinder the uniform formation of the following shed. In the weaving machine 1 according to the invention therefore can continue to be provided a reed 15, which, however, performs no conventional weft stop, but only to near the weft insertion zone 14 can be moved to align the trailing edge 18 of the weft material 7 straight.

The lift of the reed 15 is limited over conventional prior art devices. The reed 15 is movable between one, with respect to the withdrawal direction AR, front end position EV, which is shown in dashed lines, and a rear end position EH, which is shown in solid lines. In this case, the front end position EV lies behind or upwards of the weft insertion zone 14 or behind the trailing edge 18 of a weft material 7 oriented in the weft insertion zone 14 or reaches it straight. In this way it can be achieved that only the trailing edge 18 of an arcuate protective material 7 is straightened, with no damage to the weft material 7 due to the limited stroke. By contrast, if the weft material 7 is oriented straight and stretched in the weft insertion zone 14, then it will not be affected by the movement of the sheet. Since the weft material 7 comes into contact with the reed 15 only when it takes an undesirable arcuate course, thereby further the risk of damage can be reduced. Due to the limited blade stop can be ensured that the weft material 7 assumes a straight course in each case and a uniform shedding takes place.

The movement of the reed 15 in the cycle of movement of the limiting means 16 and the goods moving means 10 and 13 is in Fig. 3 . 4 and 5 also shown with. How out Fig. 3a . 4a and 5a can be seen, immediately after the weft insertion, the movement of the reed 15 starts from its rear End position EH towards its front end position EV, which in Fig. 3b / 4b / 5b and 3c / 4c / 5c is shown and which is located substantially in the region of the trailing edge 18 of the last registered shot material 7. The reed already abuts against the take-off direction AR in its front end position EV during the movement of the goods and the limiting means movement, and thus prevents a displacement of the weft material 7 from the weft insertion zone 14. Fig. 3c / 4c / 5c ) and the made Vertuchung the reed 15 moves back to its rear end position EH.

Continue in Fig. 6 Shown are the weft insertion means 6, in this case a gripper with a gripper clamp 22, as well as on the opposite side, on which the weft material to be introduced 7 is provided, a Hinreicheklemme 23. To the arcuate orientation of the weft material 7 after weft insertion and the formation of a wave-like course to prevent further by the moving warp materials 3, it is provided according to an advantageous embodiment of the invention that after the weft insertion the registered weft material 7 remains clamped in the terminals 22 and 23 until it is completely in the protection zone between the upper and lower limiting means 16 is located. The weft material 7 thus remains under tension until the goods movement is completed against the withdrawal direction AR and the limitation of the shed 5 by the limiting means 16 begins. The weft material 7 is thus protected and guided during the entire tissue formation process, so that a particularly uniform tissue 9 can be achieved.

Are the limiting means 16, as in FIG. 4 described, designed as a clamping means, the weft material 7 during the entire tissue formation process and its removal from the weft insertion zone 14th be clamped and thereby protected from deformation. Here, after the limiting means 16 have run over the last registered shot material 7, the shot material 7 is clamped in the limiting means, as in Fig. 4d shown. Only then are the clamps 22 and 23 released and the goods movement and the movement of the limiting means 16 in the withdrawal direction AR started.

As continues in Fig. 6 illustrated, it is advantageous if the movement of the limiting means 16 and the removal of the weft material 7 from the weft insertion zone 14 by means of suitable sensors 24, 24 'is monitored. Thus, for example, at least one sensor 24 may be arranged within the limiting means movement region BB, which monitors the upward end position EP2 of the limiting means 16 and registers the driving away of the limiting means 16 from the end position EP2. If the sensor 24 can detect no movement of the limiting means 16 from its end position EP2, the weaving machine 1 is stopped immediately in order to avoid collisions with the weft insertion means 6. Likewise, further sensors 24 may be provided in the limiting means movement region BB or the downwards-reaching end position EP1 of the limiting means 16 may be monitored in order to trigger a corresponding release of the weft insertion means 6. Furthermore, further sensors 24 'can be provided, for example, within the weft insertion zone 14 in the lateral areas, in order to monitor the correct removal of the weft material 7 from the weft insertion zone 14.

By the movable limiting means 16 according to the invention, which can be moved without a direct contact of the goods 9 or the weft material 7, a particularly gentle Vertuchen the weft material 7 can take place. Damage to the weft material 7 or the goods 9 by friction on the limiting means 16 are avoided as well the problems of bowing and wave formation existing in the prior art. It is particularly advantageous here that the weft material 7 is located during the entire removal from the weft insertion zone 14 in a protected area between the upper and lower limiting means 16. Characterized in that the goods movement means 13 and the limiting means 16 are formed as separate units, the goods 9 also during the movement of the limiting means 16 on the weft material 7 by the goods movement means 10, 13 out, so that the risk of undesirable gap formation between the goods. 9 and the newly to be shot material 7 can be avoided.

LIST OF REFERENCE NUMBERS

1

loom

2

warp beam

3

warp

4

Shedding means

5

shed

6

Weft insertion means

7

weft material

8th

withdrawal means

9

Goods, tissues

10

Means for movement of goods, string tree

11

heald

12

Edge of the fabric, binding point

13

Means for movement of goods, breast tree

14

Weft insertion zone

15

reed

16

limiting means

17

Leading edge of the weft material

18

Trailing edge of the weft material

19

Afford

20

actuator

21

drive

22

gripper clamp

23

Hinreicheklemme

24, 24 '

sensor

25

linear guide

AR

withdrawal direction

WB

Goods movement range

BB

Limiting means range of motion

AG

downward starting position

AH

Upward pickup position

EP1

downwards end position

EP2

upward end position

EV

front end position of the reed

EH

rear end position of the reed

d

distance

Claims (15)

1. A weaving machine (1) for producing a woven fabric (9) with shedding means (4) for alternately raising and lowering warp material (3) in order to form a shed (5), with weft insertion means (6) which are arranged in the warp direction in a stationary manner in a weft insertion zone (14) in order to insert a tape-shaped weft material (7) into the shed (5), with draw-off means (8) for drawing off the finished cloth (9) in a drawing-off direction (AR), and with means (13, 10) for moving the cloth in the warp direction, by means of which means (13, 10) the cloth fell (12) can be moved to and fro in a cloth movement range (WB) between an initial position (AG) which lies downstream and a pick-up position (AH) which lies upstream, in order to bring the weft material (7) inserted last in each case into contact with the cloth fell (12) in the pick-up position (AH), characterized in that furthermore, upper and lower limiting means (16) are provided which limit the opening of the shed (5), in that the limiting means (16) can be moved to and fro in the warp direction within a limiting-means movement range (BB) between an end position (EP2) which lies upstream and an end position (EP1) which lies downstream, and in that the limiting means (16) can be moved, at least counter to the drawing-off direction (AR), without contact with the cloth (9) and the last-inserted weft material (7).
2. A weaving machine according to claim 1, characterized in that the limiting-means movement range (BB) is different from the cloth movement range (WB), preferably larger than the cloth movement range (WB).
3. A weaving machine according to claim 1, characterized in that the limiting means (16) can be driven in the warp direction by means of a separate drive (21) independent of the cloth movement means (13, 10).
4. A weaving machine according to claim 1, characterized in that the weft insertion zone (14) lies substantially within the limiting-means movement range (BB).
5. A weaving machine according to claim 1, characterized in that the cloth fell (12) can be maintained by the cloth movement means (13,10) in the pick-up position (AH) in a temporary standstill.
6. A weaving machine according to claim 1, characterized in that the limiting means (16) can be maintained in one or several arbitrary positions within the limiting-means movement range (BB) in a temporary standstill.
7. A weaving machine according to claim 1, characterized in that the limiting means (16) can be maintained in an intermediate position (ZP) and/or in the end position (EP2) which lies upstream in a temporary standstill.
8. A weaving machine according to claim 1, characterized in that the shed forming means (4) are designed such that in the weaving operation after shed closing a temporary shed standstill is made possible.
9. A weaving machine according to claim 8, characterized in that the shed forming means (4) comprise shafts with elongated heddle eyes (11), which make possible a shed standstill over at least 1/36 of a weaving cycle.
10. A weaving machine according to claim 1, characterized in that the limiting means (16) contain two rails (19) extending in the weft direction.
11. A weaving machine according to claim 10, characterized in that a distance (d) of the rails (19) is adjustable, preferably adjustable in the weaving operation.
12. A weaving machine according to claim 1, characterized in that the limiting means (16) are designed as clamping means.
13. A weaving machine according to claim 1, characterized in that a movable weaving comb (15) is provided in the warp direction between a front end position (EV) and a rear end position (EH), wherein the front end position (EV) of the weaving comb (15) in relation to drawing-off direction lies upstream of the weft insertion zone (14) or just reaches the latter.
14. A weaving machine according to claim 1, characterized in that in the limiting-means movement range (BB) at least one sensor (24) is arranged on the weaving machine (1), which records the position of the limiting means (16) in the warp direction.
15. A weaving machine according to claim 1, characterized in that at least one sensor (24') is arranged on the weaving machine (1), which records the position of the last-inserted weft material (7).

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