EP0988409A1

EP0988409A1 - Method for producing woven fabric

Info

Publication number: EP0988409A1
Application number: EP98939497A
Authority: EP
Inventors: Falk-Hayo Sanders
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-06-12
Filing date: 1998-06-09
Publication date: 2000-03-29
Anticipated expiration: 2018-06-09
Also published as: AU8799198A; TW393535B; JP2002503296A; DE19724893A1; DE59802548D1; EP0988409B1; WO1998056967A1; US5909750A

Abstract

The invention relates to a method for producing woven fabric of defined length, consisting of the following steps: 1. placement of the warp ends in a warp end position in a frame determining the defined length and fixation of the warp ends in the frame (warp end station); 2. placement of the frame into a weft device with a shedding device (1st transfer stage); 3. positioning of the weft with actuation of the shedding device (weft station); 4. filling of the frame with the finished woven fabric to the maximum size of the frame (2nd transfer stage); removal of the woven fabric from the frame (removal post).

Description

Process for the production of woven goods

The invention relates to a method for producing woven goods in defined lengths and to an apparatus for performing this method.

Woven goods have so far been produced on weaving machines which pull their warp threads from a warp beam, which is usually intended for a lot size or warp length of 1000 meters and more. The warp beam forms an essential part of the assemblies involved in the production of woven goods, for the creation of which a complex, expensive process is required, so that only warp beams that weave woven goods in the lot sizes specified above are suitable for the production of woven goods allow. For the production of a standard woven fabric, for example for a customary, non-patterned shirt material, it is practically irrelevant that the woven fabric in question must be produced in the lot sizes indicated, because this woven fabric is constantly used as the standard fabric. In the context of a fashionable development with considerable variation within patterns, however, the creation of a normal warp beam is an obstacle, since it can often not be predicted to what extent a new type of woven fabric will be sold later.

There is therefore a need to economically produce woven goods in relatively short lengths (small lot sizes), for example in lengths of a few hundred meters and below. A warp beam required for the production of such a short length is such a large one Effort that this makes the woven goods considerably more expensive, possibly to such an extent that the production is no longer economical.

The invention has for its object to provide a method for the manufacture 5 of woven goods with which delimited lengths can be produced in each case, for which the creation of one's own warp beam is normally too uneconomical or takes too long.

According to the invention, this is done by a method with the following method steps:

1. Laying of warp threads to a warp thread layer in a frame that determines the defined length with holding the warp threads on the frame (warp thread station), ι ₅ 2. Introducing the frame into a weft insertion device with

Shed forming device (1st transfer step),

3. Laying the weft threads using the shedding device (weft thread station),

4. Spreading the frame with the finished woven goods up to the maximum size of the frame (2nd transfer step),

5. Removal of the webware from the frame (removal station).

No warp beam is required in the method according to the invention. A frame is used in the warp thread station to lay the warp threads

2 ₅ turns, along the length of which the warp threads are placed and held on the frame. The known means of drawing-in (EPPS 460129B1, EP 0391612) or weft insertion (DEPS 3821224) can be used for laying the warp threads over the frame, ie in the first process stage threads are laid in the same way as weft threads

30, but then these threads for the further production of Webware have the function of warp threads. Known means can also be used to hold the warp threads to the frame, for example the known clamping of warp threads in drawing-in machines (WO 93/06282, DEAS 2625746, USPS 3523432).

The intermediate product thus produced in the form of an arrangement of adjacent warp threads within the frame is then completed by introducing the frame into a weft insertion device through the 1st transfer step. Here, in the weft thread station, the shed is formed using a known shedding device (e.g. shedding comb elements or laying rails, heald frames with healds, jacquard healds). When using healds or jacquard healds, the warp threads are already penetrated in the warp thread station. The frame is thus prepared together with the warp threads held by him for shed formation and the placement of weft threads, which are then placed in the usual manner by striking the weft thread on the fabric edge, the length and width of the woven fabric in the through the Frame of defined size is made. The weft thread can be attached to the edge of the goods both with a closed reed, which would already be penetrated by the warp threads in the warp thread station, and with an open reed (comb). This creates a piece of woven fabric the size of the frame without the need for a warp beam for this production.

Since a frame of such a size can be used for this manufacture of the woven goods that finished goods for clothing and other applications can be produced therefrom, corresponding sizes can be produced in this way for particularly quickly satisfying needs with regard to specially patterned woven goods. The finished webware can namely be removed from the size of the frame and directly for the Manufacture of clothing can be used. It is also possible that the cutting required for these items of clothing is already carried out in the frame. After removing the woven goods or possibly the remnants of the cut from the frame, the latter is used again, ie it is made available for the laying of warp threads in the warp thread station.

The goods on the frame can also be subjected to further processes in their semi-finished product stage, as are required in the manufacture of woven goods, e.g. for finishing the warp threads before weft insertion and finishing.

A major advantage of the method according to the invention is that small batch sizes (relatively short lengths of woven goods) can be produced economically, which is not possible using a warp beam. The production of the warp beam includes preparation costs, which are all the more important the shorter the woven goods to be produced. The previously required production of large lengths of woven goods also requires extensive storage, i.e. the total throughput time from the beginning of the process to the end product in the form of a piece of clothing is necessarily very long. This throughput time can be shortened decisively by the method according to the invention, because relatively short lengths of woven goods can be produced directly based on the need, without the stress of a warp beam.

The process according to the invention thus significantly facilitates the economical production of quickly changing fashionable weaves and the resulting pattern fabrics, since on the one hand, as explained above, the relatively short lengths of woven goods can quickly satisfy individual wishes and, moreover, also enable fast subsequent deliveries, which are also possible a particular acceptance of a sample from Trade are required, but were not feasible due to the previously required production of large lengths. The method according to the invention thus results in an enormous increase in the flexibility of the entire textile chain.

It is possible to keep the warp layer from the frame both tensioned and untensioned. In the transfer steps in particular, the warp thread layer can be kept untensioned, which may save space. In addition, the untensioned hold during finishing or finishing can prove to be useful. In any case, the layer of warp threads must at least partially be kept taut where the weft threads are laid.

In the warp thread station in particular, the warp threads can be laid essentially in the vertical direction, wherein the force of gravity can be used for the alignment of the warp threads. This also results in a space-saving arrangement compared to the horizontal surface. However, it is also possible to carry out the entire process with the frames essentially aligned horizontally.

It is also possible to connect the warp threads of two frames together, e.g. by using a conventional knotting machine. This could eliminate the need for the healds and the reed to pass through with the warp threads in the warp thread station. The bar of the frame would then be removed after the warp threads had been connected, even before they run through the weft insertion device.

The device for carrying out the method explained above essentially has the above-mentioned framework, which in different

Way can be designed. First of all, it is necessary to form at least two opposite strips with thread holding device to form the frame. to be provided that hold the warp thread layer. In this case, special measures must be taken to ensure that the strips are each held at the desired distance, the thread holding devices ensuring that the weft threads placed cannot slide off the strips.

If a rigid frame is to be provided for carrying out the method, then the two opposite strips are connected with two bridges which keep them at a fixed distance. The result is a rigid structure which is particularly advantageous for smaller frame lengths.

It is also possible to arrange the strips so that they can move between a distance that determines the defined length and a shorter distance. This makes sense, for example, if the warp thread layer in the warp thread station is first placed over the frame and then transported untensioned. In the latter case, the warp thread layer sags in relation to the strips. It is also possible to design at least one of the strips as a rotatable roller. This can save space in the weft station, for example. If only one roller can be rotated, there is the possibility of running a weft carriage which is customary for laying the weft threads in the warp knitting back and forth across the frame, with one weft after the other being continuously wound up by unwinding or winding up the previously laid warp threads is placed, one after the other, so that this results in the woven fabric. It must of course be taken into account that one bar, either the fixed bar or the rotatable roller, either moves towards the other bar or moves away from it, that is to say is provided with a corresponding movement mechanism. It is also possible to design both strips as rotatable rollers, with the same effect in terms of Saving space results, but without the one bar having to move relative to the other bar. It must also be taken into account here that such a design can be adapted more easily to existing weaving machines with a warp beam drive.

Exemplary embodiments of the invention are shown in the figures:

Show it:

Figure 1: a plant in a basic perspective view, which works according to the method;

FIG. 2: a system corresponding to the system according to FIG. 1, equipped with heald frames and healds;

Figure 3: the individual process steps and process stations;

Figure 4: a warp thread station in a vertical design;

Figure 5: an arrangement for clamping the warp threads;

FIG. 6: a section along the line V - V from FIG. 5;

Figure 7: an untensioned warp layer;

Figure 8: a tensioned warp layer;

FIG. 9: a frame consisting of two strips, in which the one strip is designed as a rotatable roller; Figure 10: a frame similar to that of Figure 9, but in which both strips are designed as rotatable rollers;

Figure 11: the activation of the step of finishing;

Figure 12: the process step of finishing;

Figure 13: the cutting process step.

In Figure 1, the system for performing the method according to the invention is shown, which has the warp thread station 1, the weft thread station 2 and the removal station 3. In each of these stations, a frame 4 is drawn, which consists of the two strips 5 and 6 and the bridges 7 and 8 connecting them. In the warp thread station 1, 4 warp threads 9 are placed over the frame, by means of the insertion devices 10 and 11, which act like normal weft insertion or drawing-in devices, but in this case lay threads which later have the effect of warp threads in the finished woven fabric . The warp threads are held in the area of the strips 5 and 6 by holding devices, for example shown in FIGS. 5 and 6. By moving the frame 4 with respect to the entry devices 10 and 11, a warp thread layer is continuously laid over the entire frame until the frame is full. It is of course necessary for the frame 4 to be shifted to the right, where there is sufficient free space. It finally arrives in the position indicated by dash-dotted lines.

The frame carrying such a warp thread layer, shown in broken lines in FIG. 1 with warp threads drawn in broken lines, is then in a first Transfer step transferred to the weft station 2. In this case, conventional weft insertion devices 12, 13 are provided with the usual devices for shed formation and the attachment to the fabric edge, which now place the weft yarns 14 across the previously laid warp yarns 9, thus creating the desired woven fabric. At this station, the frame 15 located here is guided past the weft insertion devices 12 and 13, so that the entire frame 15 is finally filled with the finished woven fabric. The frame 15 is of course the same frame as it is designated within the warp thread station 1 with the reference number 4.

After the weft threads 14 have been completely laid in the weft thread station, the frame 15 is brought out in the second transfer step into the removal station 3, in which the fully manufactured woven goods can be removed from the frame. In principle, this completes the manufacturing process for the desired woven fabric.

Conventional conveyor belts are used for the transport of the frame 4 or the frame 15, the design of which is not important in the context of this invention, i.e. conventional transport systems are used for this.

FIG. 2 shows a system which is largely the same as the system according to FIG. 1, in which only the heald frames 16, 17 and 18 which are usually used for weft insertion are shown. The other modules shown in FIG. 2 correspond to those according to FIG. 2 and are therefore provided with the same reference numerals. The heald frames 16, 17 and 18 are carried by holders which are provided with the reference numbers 19 and 20 in the area of the warp thread station and are provided on both sides on each frame. Before the start of the manufacturing process, the The frame 4 is equipped with the heald frame 16, which then runs through all the stations and is finally removed from the frame in question in the removal station 3, in order then to be used in a new frame in the warp thread station. The healds 21 used in heald frames are also indicated in the heald frames 16, 17 and 18. With regard to the function of the system according to FIG. 2, reference is made to the relevant explanations in FIG. 1.

3 shows the sequence of the method in three superimposed diagrams A, B and C, which to a certain extent show the systems according to FIGS. 1 and 2 in a side view, the stations 2 and 3 becoming clear (station 1 is covered by the frame 4 shown in diagram A, which in this diagram is in the waiting position in front of station 2. Its waiting position is indicated in FIGS. 1 and 2 by the dash-dotted lines.

Diagram A shows the frame 4 with the heald frame 16 in the waiting position mentioned above, while the frame 15 is in the area of the weft insertion device 12, that is to say in the weft thread station 2. The frame 15 has already reached the end of the weft insertion process. The conveyor belt 15, which will be discussed in greater detail below, first transports the frame 15 into the removal station 3 and then the frame 4 into the station 2, which is shown in diagram B. It is the weft thread station 2, in which the frame provided here with the reference number 4 is provided with the individual weft threads which are laid by the warp threads provided. For this purpose, the heald frame 16, which is now coupled to the weft insertion devices 12 and 13 (13 is not visible in diagram B), so that in the station 2, as already explained above, the weft threads in the usual manner, in the previously laid Warp threads can be woven. The frame 15 moves on towards the right, which results from diagram C. In diagram B there is also shown a frame 15 which has previously been completely provided with the woven fabric and is located in the removal station 3, in which the finished woven fabric can be removed from the frame, whereupon the frame is inserted into the warp thread station shown in FIGS. 1 and 2 is transferred. This happens when there is a frame in the area of the weft insertion device 12 and 13, as shown in diagram C, ie during the operating phase according to diagram C, the frame shown there on the right side is removed from the transport system and into the in the Fig. 1 and 2 transferred warp thread station, unless it is fed to further processes within the frame.

Controlled conveyor belts are provided in the diagrams ABC for the transportation of the frames 4 and 15, which convey the frames, whereby by lifting and lowering certain conveyor belts these are brought into function and out of function. According to diagram A, the frame 4 is transported by the conveyor belt 22 with the deflecting rollers 23 and 24, but only when the weft thread station 2 is free. In the weft thread station 2, the frame 15 located there is transported by the conveyor belt 25 with the deflecting rollers 26 and 27, specifically because the conveyor belt 25 is in an elevated position relative to the conveyor belt 22. The frame 15 is also located above the third conveyor belt 28 of the system with the deflecting rollers 29 and 30, which take over the frame 15 after the frame 15 has passed through the weft thread 2 in that they are lifted into one position (see diagram B), in which the conveyor belt 28 runs above the conveyor belt 25. With the help of the conveyor belt 28, the frame 15 is thus conveyed into the end position shown in diagram B within the removal station 3. Meanwhile, as already mentioned, a new frame 4 was inserted into the weft station. That’s why Conveyor belt 22 is raised, whereby frame 4 has also been raised according to diagram A and is outside the effective range of conveyor belt 25. After the frame 4 has entered the area of the weft insertion device 12 according to diagram B, the conveyor belt 22 is lowered so that the conveyor belt 25 now overlaps the frame 4, as shown in diagram C.

The frame located in the weft station 2 is then exposed to the action of the weft insertion device 12, which weaves the weft insertion into the warp threads carried by the frame concerned, until the frame assumes the position shown in diagram A, designated by reference number 15. As already mentioned above, while the weft threads are being laid in the area of the weft thread station 2, the finished goods are removed from the frame located in the removal station 3 and this frame is transferred to the warp thread station (see FIGS. 1 and 2).

FIG. 4 shows a variant of the warp thread station 1 according to FIGS. 1 and 2, in which the warp threads 9 are laid in the vertical direction through the entry devices 10 and 11. This may be necessary for reasons of space, and it may also result in energy savings. A transfer in the first transfer step to the waiting position shown in broken lines in FIGS. 1 and 2 is then necessary, for which purpose a conventional transmission mechanism can be used, the design of which is not important in this context.

FIG. 5 shows an exemplary embodiment of a holding device which, as briefly indicated above, takes effect when the warp threads are laid in the warp thread station 1 (see explanations for FIG. 1). The holding device uses the strips 5 and 6 according to FIG. 1 in the form of the strip halves 31 and 32, of which the strip half 31 is stationary, while the last half 32 is pressed continuously by the delivery device 33 against the last half 31, depending on the laying of the warp threads. The warp threads are laid and cut off by the laying devices designated in FIG. 1 with 10 and 11 via an additional device in the form of the chain 34 with individual holders 35 provided with individual clamps (DE-AS 26 25 746), the individual holders each with a Warp threads are applied, which is then conveyed from the chain 34 into the area of the strip halves 31 and 32, where the individual holders 35 are loosened and the warp threads are then placed close to one another and first clamped by the two strip halves 31 and 32 and finally by completely merging the Halves of the last are clamped.

Fig. 6 shows a section along the line V-V. It shows the two ledge halves 31 and 32, of which the ledge half 31 is provided with an elastic strand 36 which presses on a thread 9 which is passed through and first clamps this and, after bringing together the two ledge halves 31, 32, clamps it.

Fig. 7 shows an untensioned warp thread 9, held by two strips 5 and 6, between which the warp thread 9 sags. If the two

Bars 5 and 6 are brought apart, the position shown in Fig. 8 results, in which the warp thread 9 is drawn in tension. The

Tension occurs through bridge 8. In Figures 9 and 10 there are two

Variants of the design of the strips belonging to a frame are shown, with one strip as winding roller 37 according to FIG. 9 and according to FIG

10 both strips are designed as winding strips 37 and 38. With such winding strips, different strip spacings can be achieved in the frames used. FIG. 11 shows schematically how a sizing bath 39 is introduced immediately behind the warp thread station 1 and in front of the waiting station, which is used for sizing the warp thread Used warp threads. In the waiting position, the blower 40 is arranged, which is used to dry the sized warp threads.

Fig. 12 shows an equipment station 41, which can be switched between the weft thread station 2 and the take-off station 3. In this finishing station 41, the finished woven fabric is guided over various deflecting rollers through a number of different baths, as is known to be required for the finishing. The promotion of the woven goods 42 takes place here by conveyor belts 43, 44 running one above the other, which guide the woven goods 42 in the area of the successive baths. The conveyor belts 43, 44 consist of a liquid-permeable material, they can e.g. be network-like or consist of perforated rubber bands. The woven fabric 42 is passed in individual pieces through the finishing station 41, the beginning and end of each piece of woven fabric being guided by the strips 5 and 6, from which the bridges 5 and 6 which have held apart the bridges have previously been removed, so that the woven material can move freely can be transported through the multiple diversions through the individual baths.

The fan 45 is provided at the exit of the finishing station and dries the blown goods by blowing them on.

13 shows a schematic representation of a cutting device which can also be switched on before or in the take-off station 3. With the knife 47 moved by a controller 46, which is guided over the woven material clamped in the frame 15, the desired piece of woven material can be cut out from it in accordance with a cutting pattern or electronic cutting data. The frame 15 is placed over the cutting table 49, the woven fabric 48 is supported against its surface, so that the knife 47 finds a suitable abutment when cutting.

Claims

claims

1. A method for producing woven goods (42, 48) in defined lengths, characterized by the following process steps: 1. Laying warp threads (9) to form a warp thread layer in a frame (4, 15) that determines the defined length and holding the warp threads ( 9) on the frame (4, 15) (warp thread station 1),

2. introducing the frame (4, 15) into a weft insertion device (12, 13) with shedding device (1st transfer step),

3. Laying the weft threads (14) by actuating the shedding device (weft thread station 2),

4. spreading the frame (4, 15) with the finished woven fabric (42, 48) up to the maximum size of the frame (4, 15) (2nd transfer step),

5. Removing the woven goods (42, 48) from the frame (4, 15) (removal station 3).

2. The method according to claim 1, characterized in that the warp thread layer is sized before the 1st transfer step.

3. The method according to claim 1 or 2, characterized in that after the 2nd transfer step, the finished woven fabric (42, 48) on the frame (4, 15) is subjected to an finishing process.

4. The method according to any one of claims 1 to 3, characterized in that the finished woven fabric (42, 48) on the frame (4, 15) is cut.

5. The method according to any one of claims 1 to 4, characterized in that the warp thread layer of the frame (4, 15) is kept both tensioned and untensioned.

6. The method according to any one of claims 1 to 5, characterized in that the laying of the warp threads (9) takes place substantially in the horizontal direction.

7. The method according to any one of claims 1 to 5, characterized in that the laying of the warp threads (9) takes place substantially in the vertical direction (Fig. 4).

8. The method according to claim 1, characterized in that the warp threads are connected to one another by two successive frames, e.g. by knotting.

9. Device for carrying out the method according to one of the preceding claims, characterized in that the frame (4, 15) contains at least two opposite strips (5, 6) with thread holding devices (31, 32) which hold the warp thread layer.

10. The device according to claim 9, characterized in that the frame (4, 15) consists of two opposite strips (5, 6) and these at a fixed distance bridges (7, 8).

11. The device according to claim 9, characterized in that the strips (5, 6) are movably arranged between a distance determining the defined length and a shorter distance.

12. The apparatus according to claim 9, characterized in that at least one of the strips is designed as a rotatable roller (37, 38).