EP0185907A2 - Process for making a hinge seam for connecting the ends of a woven band together, and apparatus for carrying it out - Google Patents

Abstract

The invention relates to a method for producing a push-in seam for making a fabric band, in particular a sieve, in which the warp thread ends of each fabric side are interwoven with an auxiliary warp strip, and a seaming machine for carrying out the method. In order to mechanize or automate the previously cumbersome and time-consuming manual work in the production of the pin seam and thereby achieve a noticeable relief for the workforce and thus an increase in productivity and the quality of the pin seams, it is proposed that the warp thread ends mechanically after fraying the right and left side of the fabric lined up in a magazine band, separated individually according to the weaving order and alternately fed back and woven around a central wire of any cross-sectional area arranged in the middle of the auxiliary warp strip, consisting of at least one wire, so that the central wire alternately changes in accordance with the work progress one warp thread end is wrapped around the right and left side of the fabric, while the opposite warp thread is woven back without wrapping the central wire, the warp thread ends following the entry in the weaving order speaking open compartment parallel to the selvedge.

Description

The invention relates to a method for producing a plug-in seam for making a fabric band endless according to the preamble of claim 1 and claim 4. It also relates to a seaming machine for carrying out the method.

The fabric belts of the type mentioned at the outset include, in particular, drainage or dryer fabrics. Compared to endlessly woven or made endless by a woven seam, sieves with a plug seam have the advantage that they can be made endless in the dewatering machine or in the dry part of the paper machine even by joining the two prepared fabric ends with a plug wire. The production of these plug-in seams has so far been done by hand, by weaving or splicing back the warp wires on each fabric side of two fabric ends to be sewn, so that a row of warp wire loops is formed on each side, through which the common, connecting plug wire can then be guided.

The production of such a plug-in seam by hand is similarly complex as described in EP 00 43 441 or in DE-GM 81 22 451 for the continuous making of drainage sieves with a woven seam.

The object of the invention is therefore to provide a method and a machine that make it possible to mechanize or automate the cumbersome and time-consuming manual work and thereby a noticeable relief of the workforce and thus an increase in productivity and the quality of the plug to reach seams.

This object is achieved according to the invention in accordance with a proposal in that the warp thread ends are lined up mechanically after the fraying of the right and left side of the fabric in a magazine band, separated individually according to the weaving order and alternately around one in the middle of the auxiliary warp bar, consisting of at least one wire Central wire of any cross-sectional area are returned and -woven so that the central wire is alternately wrapped by a warp thread end of the right and left fabric side according to the progress of work, while the opposite warp thread is woven back without wrapping the central wire, the warp thread ends after the entry in the Woven regulations corresponding open compartment are posted parallel to the selvedge.

According to another proposed solution, the method according to the invention consists in that the warp thread ends are lined up mechanically after fraying the right and left side of the fabric in a magazine band, separated according to the weaving order and individually woven back around a loop of a wire spiral, with the use of two wire spirals paralleling them and are not connected to one another, and the left and right ends of the fabric are held in such a way that lateral sliding or displacement is prevented. The wire spirals are then connected with a common jumper wire outside the sewing machine.

A seam machine is used to carry out the method according to the invention, which is characterized by thread separators arranged on both sides of the plug-in seam to be produced, for separating and separating the warp threads ends from the warp threads arranged in magazine bundles on each side of the fabric, a gripper system consisting of transfer grippers and pull-through grippers for inserting the released individual threads into a weaving shed, which is formed by auxiliary warp threads by a shedding device, in which the individual threads can be attached to the respective fabric edge by a driven shed per half of the seam after striking, the individual threads can be weaved back into their own fabric side either by one or more central wires or wire spirals or by avoiding the central wire or wires.

Further advantageous embodiments of the invention are characterized in the subclaims.

• Fig. 1 eine schematische, isometrische Ansicht der erfindungsgemäßen Nahtungsmaschine von vorm,
• Fig. 2 eine Stirnansicht der Maschine von Fig. 1 in einem kleineren Maßstab, wobei die endlose zu machende Gewebebahn zeltartig über die Nahtungsmaschine hinweggeführt ist,
• Fig. 3-5 schematische Darstellungen der Arbeitsschritte bei der Herstellung der Stecknaht für eine Gewebeseite,
• Fig. 6 eine schematische Draufsicht des Magazinierbundes der mittels eines Zentraldrahtes miteinander zu verbindenden rechten und linken Gewebeseite,
• Fig. 7 eine der Fig.6 entsprechende Draufsicht, bei der jedoch anstelle eines Zentraldrahtes zwei parallele Steckdrähte Verwendung finden,
• Fig. 8 die Draufsicht eines Gewebeendes, in das eine Drahtspirale eingewoben ist, wobei jedes Kettdrahtende in die Spirale einbindet,
• Fig. 9 eine Querschnittsansicht zweier mit je einer Drahtspirale versehener Gewebeenden, die durch eine mit Führungsrollen versehene Vorrichtung positioniert werden und
• Fig. 10 eine der Fig.8 ähnliche Draufsicht eines Gewebeendes, bei der die Drahtspirale zusammen mit einem in ihr liegenden Draht eingewoben ist.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing. The drawing shows:

• 1 is a schematic, isometric view of the seam machine according to the invention from vorm,
• 2 shows a front view of the machine of FIG. 1 on a smaller scale, the endless fabric web to be made being guided over the seaming machine like a tent,
• 3-5 schematic representations of the working steps in the production of the plug seam for a fabric side,
• 6 shows a schematic top view of the magazine bundle of the right and left side of the tissue to be connected to one another by means of a central wire,
• 7 shows a top view corresponding to FIG. 6, but in which two parallel plug-in wires are used instead of a central wire,
• 8 shows the top view of a fabric end into which a wire spiral is woven, each warp wire end being integrated into the spiral,
• 9 shows a cross-sectional view of two fabric ends, each provided with a wire spiral, which are positioned by a device provided with guide rollers, and
• 10 shows a plan view of a fabric end similar to FIG. 8, in which the wire spiral is woven together with a wire lying in it.

As can be seen from FIG. 1, the sewing machine is mounted on a chassis 1, consisting of a frame body 31 which is movable on wheels 30 and which can be moved by a controlled drive motor 2 in the rhythm of the weaving progress. The frame body 31 is guided below the working plane of the machine on both sides on two parallel guide tubes 3, which in turn are attached at their ends to a horizontal cross member 32 of a stand 4. All other operating elements of the sewing machine according to the invention are also mounted on the chassis 1, not all of which are described in detail, since they are not necessary for understanding the workflow or the method.

The shed forming device 5 as one of these operating elements is connected to the chassis via a console 6.

The switching and monitoring devices necessary for operating the sewing machine, which are not shown, are attached to the console 6. In addition, thread separators 7, 7 'and transfer grippers 8, 8' are fastened to the bracket 6 or to the shedding device 5 for both fabric halves or sides, the reference numerals provided with the line index referring to the one half of the fabric and the reference numbers not having the line index belong to the opposite other half of the tissue. The pull-through grippers 9, 9 'and the two weaving shutters 10, 10' are mounted below the working level of the sewing machine.

In Fig. 1, the screen fabric 11 to be provided with a pin seam is carried out under the seaming machine, i.e. the machine rolls on the screen covered with a protective layer. Another possibility of guiding the screen fabric 11 is shown in FIG. 2. The screen fabric is then passed over the seaming machine like a tent via two support rods 23, 24.

The two ends 21, 22 of the screen fabric 11 to be provided with a pin seam are prepared before insertion into the seaming machine as far as the weft threads are removed in an area of approximately 10 to 20 cm width and then, depending on the weave, 10 to 30 weft threads on the Warp thread ends 12, 12 'can be combined in their exact weaving position to form a magazine band 13, 13'. The magazines 13, 13 'are fastened to the end stands 4, 4' of the chassis, of which only one is shown in FIG. 1, by means of a clamping device 14.

Before the start of the seam lies between the two frayed ends of the screen fabric 11, which are held by the magazines 13, 13 ', on both sides of the wire 16, which as Central wire is to be referred to, a wire bundle which can consist of original weft threads of the fabric or a strip 15, 15 ', also called auxiliary warp strip, which consists of original weft threads of the fabric and which represents the chain for the seam weaving process which runs transverse to the actual direction of sieving. The central wire 16 is located exactly in the middle between the two auxiliary chain strips 15, 15 '. The auxiliary warp strips and the central wire are fastened in a further tensioning device 17 of the machine, which is also carried by the stands 4, 4 '.

The individual wires of the auxiliary chain and the central wire are guided in the eyelets of the shedding device 5, which is located above or below the weaving plane on the chassis. The separation and separation of the warp thread ends 12, 12 '(FIG. 1) with the aid of the thread separators 7, 7' is carried out in a manner known per se, with seam-forming elements of the same type on both sides, such as thread separators 7,7 ', transfer hooks 8,8', Pull-through grippers 9.9 'and weaving frames 10.10' are provided. First, the transfer rapier 8 'takes over the warp thread separated by the thread separator 7' and swings it down into the transfer position of the working plane, as can be seen in FIG. 3. Then the pull-through gripper 9 takes over the warp thread end and pulls the warp thread into the full compartment formed by the shedding device 5. The warp thread end thus entered is then struck against the selvedge by the sley 10 '. A partial compartment is now formed from the left part of the auxiliary warp strip 15 ', as can be seen in FIG. 4, and the same end of the warp thread is pivoted back by the pull-through gripper 9 into the transfer position mentioned, where it is taken over by the pull-through gripper 9', with the hand-over gripper 8 'during the transfer process positioning aid by pressing of the warp thread. The pull-through gripper 9 'then tensions the end of the warp thread, whereupon the sley 10' is struck again. Then the connector compartment is formed in the auxiliary warp thread half 15 ' The next warp thread is brought into the upper transfer position by the upper-hand gripper 8 'and inserted into the now external compartment by the pull-through gripper 9, as can be seen in FIG. 5, after which the warp thread is again struck with the sley 10'.

Since the central wire 16 is not involved in the change of subject during these operations, it is not wrapped around by the warp wire ends. This is shown in Fig. 6 by the threads or wires a and b. Thereafter, the operations described above are repeated in the same order with the following wires or threads b and d, but this time the central wire 16 is included in the change of subject and thus in the warp wire loop. Thus, only every second warp thread of each fabric end forms a load-bearing warp wire loop 33, 33 'which can transmit longitudinal forces.

The corresponding operations are then repeated on the other half 15 of the auxiliary warp strip, this time the stop is made by the sley 10, and the wires or threads e, f and g, h are entered, as shown in FIG. 6. The structure of the two weaving shops 10, 10 'is known per se and is therefore not explained in more detail here.

Instead of a single central wire 16, it is also possible to weave in several parallel juxtaposed plug wires, for example two plug wires 27, 27 ', as shown in FIG. 7, which increases the seam strength because all the warp threads of the fabric protrude in contrast to the one shown in FIG. 6 Seam. The use of two plug wires takes into account in particular the fact that with a frequently used four-ply, so-called double-layer fabric, the loops due to the natural thread offset turn out to be alternately long and short, as shown schematically in FIG. 7 for a simple tissue. The two fabric ends 15, 15 'are offset from one another such that a long loop 28 of the left screen fabric edge with a short loop 29' of the right screen fabric edge around the right plug wire 27 'and a short loop 29 of the left screen fabric edge with a long loop 28 'of the right sieve mesh around the left plug wire 27 can be combined.

In order to achieve the advantage of full seam strength in a different way, a process variant can be used in such a way that the warp thread ends are individually woven into a loop 34 of a wire spiral 25 after the fraying of the right and left side of the fabric and their alignment in the magazine band each warp wire end binds into the spiral, as shown in Fig. 8. It has proven to be expedient to guide the screen fabric ends 15, 15 'provided with the woven-in spiral 25 in a device 18 shown in FIG. 9, which is mounted in the chassis 1 of the sewing machine. This device is required in particular when using two parallel wire spirals 25, 25 ', one of which is assigned to a screen fabric side. These two wire spirals are not connected to each other. The left and right tissue ends are held by the device 18 by means of guide rollers 19, 20 in such a way that lateral slipping or displacement is prevented. Then the wire spirals are connected with a common plug wire outside of the sewing machine.

When using a common plug or central wire, a guide device of the type shown in Fig. 9 not necessary because the common central wire ensures sufficient positional stability.

In terms of control, the seaming machine described above is designed in such a way that it can also weave a wire spiral 25 of the type shown in FIG. 8 into only one side of the fabric. Finally, there is also the possibility of weaving the wire spirals, which are later connected to a common plug wire when the screen is made endless, together with a wire 26 (FIG. 10) lying in the spirals into the fabric ends.

The sewing machine is suitable for technical fabrics such as To equip dryer fabrics for drainage, paper and board machines of various compositions in warp and weft directions (mono or multifilament in polyester or polyamide) and single or multi-layer construction with push-in seams. Basic fabrics for wet felts in single or multi-layer designs can also be provided with pin seams.

For reasons of influencing permeability, it can be advantageous in individual cases if the auxiliary warp threads in the seam region, that is to say the weft threads in the original fabric, are made of a different material than the other weft threads in the fabric.

Claims (6)

1. A process for producing a pin seam for making a fabric band, in particular a sieve, in which the warp thread ends of each fabric side are interwoven with an auxiliary warp strip, characterized in that the warp thread ends are lined up mechanically after the fraying of the right and left fabric sides in a magazine band, individually in accordance with the weaving order and are alternately fed back and woven around a central wire of any cross-sectional area arranged in the middle of the auxiliary warp strip, so that the central wire is alternately wrapped by a warp thread end of the right and left side of the fabric according to the progress of work, during which each opposite warp thread is woven back without wrapping the central wire, the warp thread ends being slipped parallel to the selvedge after the insertion into the open compartment corresponding to the weaving order. 2. The method according to claim 1, characterized in that when using two parallel central wires each have a long loop of the left tissue end. With a short loop of the right tissue end around the right central wire and a short loop of the left tissue end with a long loop of the right tissue end around the left central wire. 3. The method according to claim 1 or 2, characterized in that central wires of different materials are woven. 4. A process for producing a push-in seam for making a fabric band, in particular a screen, in which the warp thread ends of each fabric side are interwoven with an auxiliary warp strip, characterized in that the warp thread ends are lined up mechanically after the fraying of the right and left fabric sides in a magazine band, accordingly the weave order is separated and individually woven back around a loop of a wire spiral, whereby when using two wire spirals they are parallel and not connected to each other, and the left and right ends of the fabric are held in such a way that lateral slipping or shifting is prevented. 5. The method according to claim 4, characterized in that at least one wire lying in the wire spiral is woven together with the wire spiral. 6. Seaming machine for carrying out the method according to one of claims 1 to 5, characterized by thread separators (7, 7 ') arranged on both sides of the plug seam to be produced for separating and separating the warp thread ends (12, 12') from the warp threads arranged in magazine bundles on each fabric side, a gripper system consisting of transfer grippers (8, 8 ') and pull-through grippers (9.9') for inserting the triggered individual threads into a weaving shed pre-formed by auxiliary warp threads by a shedding device (5), in which the individual threads are driven by a driven sley (10, 10 ' ) can be attached to the respective fabric edge per half of the seam, the individual threads being attached by the looper system (8,8 '; 9,9') either around one or more central wires (16,27,27 ') or wire spirals (25) around or while avoiding the central wire or wires or wire spirals can be woven back into their own fabric side.

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