EP0514911B1 - Process for the manufacture of a double velvet fabric with single bobbin weave and fabric made by this process - Google Patents

Description

The invention relates to a method for producing carpets woven as a double piece, in which the figures are formed by so-called pile warp threads which run from the upper fabric to the lower fabric and vice versa and at the moment when the pile threads move from one fabric to the other run as a working or figure-forming pole (pattern-forming pole), while the non-working pile threads are called dead pole (dead chore).

Furthermore, the invention relates in particular to a method for weaving on a single or double rapier loom with the exclusion of the weft of a double piece fabric (alternately one weft in the upper and lower compartment) as a result of the single-spool binding (or with single-compartment weft insertion).

The state of the art is illustrated by the attached Figure 1 illustrates, which schematically represents a single-coil weave (or weft weave) of a double piece fabric. To weave a double-piece carpet fabric according to the single-spool weaving principle, a weft thread (1) is inserted alternately into the lower fabric (OW) and the upper fabric (BW). In the first weft, the weft thread (1) is located under the tension warp thread (SO) of the lower fabric (OW). On the next weft, the weft thread (1) is located above the tension warp thread (SB) of the upper fabric. In the following weft, the weft thread (1) is located above the tension warp thread (SO) of the lower fabric (OW). In the subsequent weft, the weft thread (1) is located under the tension warp thread (SB) of the upper fabric (BW).

To bind the weft thread (1) to the tension warp threads SO and SB, one or more binding warp threads BO and BB are added.

There are various known ways of tying these binding warp threads. The basic binding repeats 4 shots each, as is the case in the example in FIG. 1 - if the basic binding changes in the weft 1-2-3-4, 5-6-7-8, 9-10-11-12, etc . repeated. To number each shot one starts from the left-most weft - which consists of a weft thread (I) inserted into the lower fabric OW - which is referred to as weft 1, while one passes through the fabric from left to right the successive Weft threads in the order: weft 2, weft 3, etc. In the figure, the numbering is shown vertically below each shot. The pile warp threads are indicated with P1, P2, P3, P4 and P5.

With regard to the gripper or the weft, these pile warp threads can take two positions.

If the pile warp thread does not make a connection between the lower fabric (OW) and the upper fabric (BW), i.e. it appears as a dead pile, this pile warp thread participates in the binding of the lower fabric OW or the Upper fabric BW, so that one speaks of an integrated pile warp thread or briefly of an integrated, dead pile.

According to the prior art, the choice is between remaining as an integrated pile warp thread or as a working or figure-forming pile warp thread for a connection e.g. of the two fabrics OW and BW or BW and OW after the weft 2. If a pile warp thread - for example P1 - is effective as a working pile in weft 1, this thread P1 is brought under the weft thread, while the other pile warp threads are passed over the weft thread . In the weft 2, the pile warp thread P1 will be placed over the weft thread, while the other pile warp threads are brought under the weft thread. After the weft 2, a change of color should take place with the pile warp thread P2, which is integrated in the lower part (lower fabric). In the weft 3, the working pile warp thread P2 is then only guided under the weft thread together with the integrated pile warp threads of the sub-carpet (which also includes the pile warp thread P1). At weft 3, the pile warp threads integrated in the top carpet are at the top. In weft 4, the pile warp thread P2 is now together with the pile warp threads (colors) integrated in the upper part above the weft I. The colors integrated in the lower part are below. The single-coil binding is obtained using this technique.

This single-coil binding has the disadvantage that it shows so-called double processing ("double workers"). In the transition from a certain color, which is formed by a figure-forming pile warp thread, which is incorporated after the transition, e.g. in the upper fabric, to another color, which is formed by a figure-forming pile warp thread, which occurs before that transition in the opposite fabric (lower fabric ) was involved, a piece of the ending color runs together with the beginning color (see shots 15 and 16 of FIG. 1). These two pieces of pile thread of different colors will lay together (in the weft direction) and will Called double workers. The dividing line between these two color fields is indistinct and shows some interlocking.

In Fig. 2 of European Patent No. 175,963 a double plush weave is shown without a double worker. One of the two pole loops, which otherwise form the double worker, has been left out. Conventionally, a color point is provided on the card drawing for 4 shots (2 shots per carpet), corresponding to the repeat of the basic weave of 4 shots.

For a pattern fineness of e.g. 4 holes / cm in the map drawing you have to provide 8 shots / cm in the carpet.

The object of the invention is a method of weaving a double-piece pile fabric, furthermore in particular a weft weave according to a single or double-spool weaving process with elimination of a weft with the aim of excluding double workers, combined with a pattern fineness of 1.5 weft per carpet and color point in the Map drawing.

The procedure for producing a double-piece carpet fabric, in particular in a single-coil weave, is further to place the working repeat for the pile warp threads on 3 wefts (1.5 wefts per carpet), while the working repeat of the basic weave is over 4 wefts (2 wefts extends per carpet).

The invention is set out in claim 1. Further features are defined in claims 2-9. A fabric according to the invention is defined in claim 10.

Further peculiarities and advantages of the method of operation according to the invention will become apparent from the following description of a method of operation according to the invention with the aid of the attached figures and tables.

Figure 1 is a schematic representation of a single-spool 1-weft binding on the double piece with double worker.

Figure 2a is a schematic representation of a single-spool 1-weft binding on a double piece without Duplicate worker, with a pattern fineness of 2 shots per carpet, which is described in European Patent No. 175,963.

FIG. 2b is a schematic representation of a 1-weft weave woven as a double piece, double-bobbin, with elimination of the weft without a double worker, a pattern fineness of 2 wefts per carpet being present.

FIG. 3a is a schematic illustration of a 1-weft weave woven as a double piece in single-spool according to the invention.

FIG. 3b is a schematic illustration of a 1-ply weave woven as a double piece with a double bobbin, with elimination of a weft according to the invention.

Figure 4 is a representation of a decision scheme for choosing a manchon.

FIG. 5 contains tables for the correspondence between the manchons used and the desired positions of the pile warp threads.

FIG. 6a is a schematic illustration of a particular situation in which a pile warp thread forming figures is placed on the upper fabric without forming figures on an intermediate repeat of the weave.

FIG. 6b is a schematic representation of the previous situation, in which the pile warp thread involved, which does not form figures, is nevertheless tied in on an intermediate weave repeat with the third weft of this repeat.

FIG. 6c is a schematic illustration of a situation in a lower fabric which corresponds to that in FIG. 6a for the upper fabric.

FIG. 6d is a schematic representation of a solution for the lower fabric, which corresponds to that of FIG. 6b for the upper fabric.

Figure 7 is a flow chart for the choice of the manchons.

In the case of a double-piece pile fabric corresponding to a single-coil woven 1-weft weave, the weave of which is shown in FIG. 3a, or corresponding to a double-coil woven 1-weft weave with the exclusion of a weft, the weave of which is shown in FIG. BW) and the lower tissue (OW).

With each odd numbered weft (1, 3, 5, ...) the weft (IB1, IB2, ...) is in the upper fabric. With weft 1, 5, 9, 13, ... the weft is above the tension warp thread (SB), while with weft 3, 7, 11, ... the weft is under the tension warp thread (SB).

With each even-numbered weft (2, 4, 6, ...) the weft (102, 104, ...) is in the lower fabric. With weft 2, 6, 10, 14, ... the weft (102, 106, I010, ...) is above the tension warp thread (S0), while with the weft (4, 8, 12, .. .) the weft (104, 108, I012, ...) is located under the tension warp thread.

The way in which these wefts are tied with the help of the binding warp threads is known and takes place with a repeat of 4 wefts.

On the other hand, when working in accordance with the invention, a working repeat of 3 wefts (1.5 wefts per carpet) is set up for the pile warp threads: this work repeat is described in detail for the pile warp threads (PF) forming the figures, for the pile warp threads (PIBW) incorporated in the upper fabric. and for the pile warp threads (PIOW) embedded in the lower fabric.

• Bei dem Rapport A hat man B/BW - B/OW - O/BW,
• bei dem Rapport B hat man O/OW - B/BW - B/OW,
• bei dem Rapport C hat man O/BW - O/OW - B/BW und
• bei dem Rapport D hat man B/OW - O/BW - O/OW.

In the case of such a fabric containing three choirs, as shown in FIG. 3a, the pile warp thread (P1) forms the figures in the weft (1, 2, 3) and is in the weft (4, 5, 6), ( 7, 8, 9), ... embedded in the upper fabric; the pile warp thread (P2) is in the weft (1, 2, 3) in the lower fabric incorporated, forms figures when weft (4, 5, 6) and is again integrated into the lower fabric when weft (7, 8, 9, 10, 11, 12, ...); the pile warp thread (P3) is bound in the weft (1, 2, 3) and (4, 5, 6) in the lower fabric, forms figures in the weft (7, 8, 9) and is in the weft (10, 11 , 12) again integrated in the lower fabric. On the map drawing you get a color point for 3 wefts in total or 1.5 wefts in the carpet, while the working repeat for the pile warp threads extends over 3 wefts, with repeats A, B, C and D for a connection in the basic weave and these reports differ from one another in the order of the wefts in that the weft threads above (B) or below (O) the tension warp threads of the upper fabric (BW) or the lower fabric (OW) run in the following manner.

• Repeat A has B / BW - B / OW - O / BW,
• Repeat B has O / OW - B / BW - B / OW,
• Repeat C has O / BW - O / OW - B / BW and
• Repeat D has B / OW - O / BW - O / OW.

The position to be occupied by the pile warp threads in a specific work report depends on the position of the pile warp threads during the previous repeat either in a figure-forming pole or in an integrated position or in the work report A, B, C or D.

PF

Figuren bildender Polkettfaden,

L

Leinwand (eingebundener Polkettfaden)

OW

Untergewebe,

BW

Obergewebe

The various possibilities are summarized in Figure 4. This table, using the following abbreviations, can be used to select the right manchon:

PF

Figure-forming pile warp thread,

L

Canvas (integrated pile warp thread)

OW

Lower fabric,

BW

Upper fabric

In accordance with the desired mode of operation, the binding manchons to be used are indicated in FIG. 5 together with the respective positions of the warp threads.

With all two wefts of the basic weave (one weft per carpet), a pile loop with at least one leg is formed on the lower fabric (OW) as well as on the upper fabric (BW). Only one pole loop of a figure-forming pile warp thread (see weft 3, 4 and weft 10, 11 in FIG. 3a) is missing in the transition of a figure-forming pole, which is integrated in the upper part, while the new figure-forming pole is integrated in the lower part was, and also in the transition of a figure-forming pole, which is integrated in the lower part, while the new figure-forming pole for it was incorporated in the top, and this applies to all work reports A, B, C and D.

As shown in FIG. 3a, the following relationships are present within the binding in the method according to the invention:

In the weft (1, 2, 3) the figure-forming pile warp thread (P1) is provided for integration in the upper fabric (BW), the previous work report not forming any figures (i.e. it was a canvas) and now the work report A and thus the manchon (21 ) are to be used (see the table in FIG. 4).

Bai the weft (4, 5, 6) of the figure-forming pile warp thread (P2) is provided for binding in the lower fabric (OW). The previous repeat formed a pile but a different pile warp thread, which was intended for its integration in the upper part, and this is done on the work repeat B. Then the manchon (18) must be used (see FIG. 4). There is no double worker between shot 2 and 3.

In the weft (7, 8, 9) the figure-forming pile warp thread (P3) is provided for binding in the lower part, while the previous repeat formed a pile but a different pile warp thread, which was now intended for binding in the lower part in the work repeat C. , for which the manchon (15) is then to be used (see FIG. 4).

In the weft (10, 11, 12), the figure-forming pile warp thread (P1) is provided for binding in the upper fabric, while the previous work repeat also formed figures with another pile thread, which is now also provided in the work repeat D for binding in the lower fabric for which the manchon (32) is to be used (see FIG. 4).

In the weft (13, 14, 15), the figure-forming pile thread (P1) is provided for binding in the upper fabric, while the previous work report now also formed figures with the same pile thread in the work report A, so that the sleeve 25 is to be used (see Figure 4).

In FIG. 5 attached here, the different positions for the different warp threads for each manchon are listed in the form of tables.

For the binding of FIG. 3a, the manchons 21, 18, 15, 32 and 25 are required one after the other. B. for the figure-forming pile warp thread one after the other the positions: top - bottom - top / bottom - top - bottom / top - bottom - top / top - top - bottom / top - bottom - top. This is indeed true of the successive positions of the pile warp thread (P1) (for weft 1, 2, 3), the pile warp thread (P2) (for the weft 4, 5, 6), the pile warp thread (P3) (for the weft 7, 8, 9) and the pile warp thread (P1) (for the weft 10, 11, 12, 13, 14, 15 ), as the schematic representation of the desired binding in Figure 3a shows.

The positions of the other pile warp threads which correspond to the different manchons can likewise be read from FIG. 5 in the same way. The other possible pile warp threads are (see table in FIG. 5): the previous figure-forming pole, the pile warp thread (PIOW), which is integrated in the lower fabric, if this is not the current or previous figure-forming pile warp thread, the pile warp thread (PIBW ), which is integrated in the upper fabric if this is not the current or previous, figure-forming pile warp thread.

If a pile warp thread, which is intended for binding in the upper part, forms figures in repeat D (see FIG. 6a) and this same pile warp thread forms figures again in the subsequent binding repeat B, in between a pile warp thread intended for binding in the lower part in pattern repeat A then has the previously explained technique, in which the suitable manchon, depending on the current pile thread, which is then already forming no figures, is intended for incorporation in the lower or upper fabric, from the previous one, which is then already forming no figures, for incorporation in The pile warp thread provided for the lower or upper fabric and from the weave repeat A, B, C or D is used, as a result of which the pile warp thread, which forms figures in the weave repeat D and B, in the weft 1, 2 and 3 of the weave repeat A lying therebetween is not integrated, but will lie above the upper fabric.

The elimination of this error is illustrated in FIG. 6b for the integrated pole, which lies above the upper fabric in the weave repeat A. The integrated pole is integrated in that it is placed under the weft 3 of the binding repeat A. This solution is achieved systematically as follows: After using the various cuffs explained in FIG. 5, the binding obtained is checked for the presence of pile warp threads which are located above the weft in five successive wefts. In these five successive wefts, the third weft is then modified from these five, the pile warp thread in question thus being brought under the third weft and thus being well integrated.

If a pile warp thread, which is intended for binding in the lower part, forms figures in the repeat A and this same pile warp thread at the subsequent weave repeat C forms figures again, with a pile warp thread provided for binding in the upper part forming patterns in repeat B between them, when using the technique explained above this has the consequence that the pile warp thread forming figures in repeat A and C forms , in which weft 1, 2 and 3 of the intermediate weave repeat B is not integrated, but will lie under the lower fabric (see FIG. 6c).

The elimination of this error is illustrated in FIG. 6d for the integrated pole, which lies below the lower fabric in the weave repeat B. The integrated pole is integrated in that it is brought over the weft 3 of the binding repeat B. This solution is achieved systematically as follows: After using the various cuffs explained in FIG. 5, the binding obtained is checked for the presence of pile warp threads which are five consecutive wefts below the weft. In these five successive shots, the third weft is then modified from these five, the pile warp thread in question being brought over the third weft and thus being well integrated.

Finally, as shown in Figure 7, a number of questions arise about the position of the pile warp thread and the related weave repeat, which leads to the choice of the manchon.

The advantage of working according to the invention generally consists in the fact that there are no duplicators in the two double-piece fabrics produced, while the pattern fineness is increased, while the same weaving speed can be maintained as before.

An arbitrary repeat of 6 wefts (i.e. 3 wefts per fabric), in which there is a transition from a figure-forming pile warp thread of the lower fabric to a figure-forming pile warp thread of the lower fabric, is in the lower fabric as well as in the upper fabric with the help of 3 pile loops each 6 shot recognizable.

An arbitrary repeat of 6 wefts (i.e. 3 wefts per fabric), in which there is a transition from a figure-forming pile thread of the lower fabric to a figure-forming pile thread of the upper fabric, is in the lower fabric as well as in the upper fabric with the help of 2 pile loops each 6 shot recognizable.

An arbitrary repeat of 6 wefts (ie 3 wefts per fabric), in which a transition from a figure-forming pile thread of the upper fabric to a figure-forming pile thread of the upper fabric takes place, is both in the Lower fabric as well as in the upper fabric can be recognized with the help of 3 pile loops, 6 wefts each.

An arbitrary repeat of 6 wefts with a transition from a figure-forming pile warp thread of the upper fabric to a figure-forming pile warp thread of the lower fabric can be seen in the lower fabric as well as in the upper fabric with the help of 2 pile loops.

The number of color dots in the map drawing of the carpet corresponds to one third of the total number of shots and thus the number of shots divided by 1.5 per carpet.

With the aid of the flow diagram according to FIG. 7, which is derived directly from FIG. 4, so that reference is made to the above detailed explanation of FIG. 4, a predetermined map drawing can easily be converted into a command sequence (impact cartridge) for the specialist movement of the pile threads are implemented while avoiding duplication of work. This implementation can also be done automatically, e.g. with the help of electronic data processing equipment.

Claims (10)

1. Method for weaving a face-to-face pile fabric with single-weft weave on a single-gripper weaving loom or a double-gripper weaving loom with alternating pick cut-out, in which the working pattern repeat (A, B, C, D) of the pile warp threads (P1,...P5) running between top fabric (BW) and bottom fabric (OW) extends only over three picks, while the working pattern repeat of the basic weave of the top fabric (BW) and the bottom fabric (OW) produced from weft threads (IB1, IB2...; I01, I02...) and basic weave warp threads (SB, BB; SO, SB) in each case extends over a number of picks other than three.
2. Method according to Claim 1, characterized in that the working pattern repeat of the basic weave extends over four picks.
3. Method according to Claim 1 or 2, characterized in that each possible working pattern repeat (A, B, C, D) extending over three picks is fixed for each possible pile warp thread (P1, ...P5) by a predetermined command sequence described as an apron, which determines the position of the particular pile warp thread (P1,...) for each pick.
4. Method according to Claim 3, characterized in that 36 aprons are available, the pile warp thread (P1,...) which is pattern-forming in the present pattern repeat being indicated by the number 1, the pile warp thread (P1, ...) which was pattern-forming in the previous pattern repeat being indicated by the number 2, the pile warp thread (P1,...) for tying into the bottom fabric (OW) in the present pattern repeat being indicated by the number 3, the pile warp thread (P1,...) for tying into the top fabric (BW) in the present pattern repeat being indicated by the number 4, and O indicating a position of the respective pile warp thread (P1,...) below the respective weft thread (IB1,...; IO1,...), while B indicates the position of the respective pile warp thread (P1,...) above the respective weft thread (IB1,...; I01,...):

   Apron 1:   Pile warp thread 1: is not present
   Pile warp thread 2: is not present
   Pile warp thread 3: O - O - O
   Pile warp thread 4: O - B - B

   Apron 2:   Pile warp thread 1: is not present
   Pile warp thread 2: is not present
   Pile warp thread 3: B - O - O
   Pile warp thread 4: B - O - B

   Apron 3:   Pile warp thread 1: is not present
   Pile warp thread 2: is not present
   Pile warp thread 3: O - B - O
   Pile warp thread 4: B - B - O

   Apron 4:   Pile warp thread 1: is not present
   Pile warp thread 2: is not present
   Pile warp thread 3: O - O - B
   Pile warp thread 4: B - B - B

   Apron 5:   Pile warp thread 1: B - O - B
   Pile warp thread 2: is not present
   Pile warp thread 3: O - O - O
   Pile warp thread 4: O - B - B

   Apron 6:   Pile warp thread 1: O - B - O
   Pile warp thread 2: is not present
   Pile warp thread 3: B - O - O
   Pile warp thread 4: B - O - B

   Apron 7:   Pile warp thread 1: B - O - B
   Pile warp thread 2: is not present
   Pile warp thread 3: O - B - O
   Pile warp thread 4: B - B - O

   Apron 8:   Pile warp thread 1: O - B - O
   Pile warp thread 2: is not present
   Pile warp thread 3: O - O - B
   Pile warp thread 4: B - B - B

   Apron 9:   Pile warp thread 1: B - O - B
   Pile warp thread 2: is not present
   Pile warp thread 3: O - O - O
   Pile warp thread 4: O - B - B

   Apron 10:   Pile warp thread 1: O - B - O
   Pile warp thread 2: is not present
   Pile warp thread 3: B - O - O
   Pile warp thread 4: B - O - B

   Apron 11:   Pile warp thread 1: B - O - B
   Pile warp thread 2: is not present
   Pile warp thread 3: O - B - O
   Pile warp thread 4: B - B - O

   Apron 12:   Pile warp thread 1: O - B - O
   Pile warp thread 2: is not present
   Pile warp thread 3: O - O - B
   Pile warp thread 4: B - B - B

   Apron 13:   Pile warp thread 1: O - O - B
   Pile warp thread 2: B - O - O
   Pile warp thread 3: O - O - O
   Pile warp thread 4: O - B - B

   Apron 14:   Pile warp thread 1: O - B - O
   Pile warp thread 2: O - O - O
   Pile warp thread 3: B - O - O
   Pile warp thread 4: B - O - B

   Apron 15:   Pile warp thread 1: B - O - B
   Pile warp thread 2: O - B - O
   Pile warp thread 3: O - B - O
   Pile warp thread 4: B - B - O

   Apron 16:   Pile warp thread 1: O - B - O
   Pile warp thread 2: O - O - B
   Pile warp thread 3: O - O - B
   Pile warp thread 4: B - B - B

   Apron 17:   Pile warp thread 1: O - O - B
   Pile warp thread 2: B - B - B
   Pile warp thread 3: O - O - O
   Pile warp thread 4: O - B - B

   Apron 18:   Pile warp thread 1: O - B - O
   Pile warp thread 2: B - O - B
   Pile warp thread 3: B - O - O
   Pile warp thread 4: B - O - B

   Apron 19:   Pile warp thread 1: O - O - B
   Pile warp thread 2: B - B - O
   Pile warp thread 3: O - B - O
   Pile warp thread 4: B - B - O

   Apron 20:   Pile warp thread 1: O - B - O
   Pile warp thread 2: B - B - B
   Pile warp thread 3: O - O - B
   Pile warp thread 4: B - B - B

   Apron 21:   Pile warp thread 1: B - O - B
   Pile warp thread 2: is not present
   Pile warp thread 3: O - O - O
   Pile warp thread 4: O - B - B

   Apron 22:   Pile warp thread 1: O - B - O
   Pile warp thread 2: is not present
   Pile warp thread 3: B - O - O
   Pile warp thread 4: B - O - B

   Apron 23:   Pile warp thread 1: B - O - B
   Pile warp thread 2: is not present
   Pile warp thread 3: O - B - O
   Pile warp thread 4: B - B - O

   Apron 24:   Pile warp thread 1: O - B - O
   Pile warp thread 2: is not present
   Pile warp thread 3: O - O - B
   Pile warp thread 4: B - B - B

   Apron 25:   Pile warp thread 1: O - B - O
   Pile warp thread 2: is not present
   Pile warp thread 3: O - O - O
   Pile warp thread 4: O - B - B

   Apron 26:   Pile warp thread 1: O - B - O
   Pile warp thread 2: is not present
   Pile warp thread 3: B - O - O
   Pile warp thread 4: B - O - B

   Apron 27:   Pile warp thread 1: B - O - B
   Pile warp thread 2: is not present
   Pile warp thread 3: O - B - O
   Pile warp thread 4: B - B - O

   Apron 28:   Pile warp thread 1: O - B - O
   Pile warp thread 2: is not present
   Pile warp thread 3: O - O - B
   Pile warp thread 4: B - B - B

   Apron 29:   Pile warp thread 1: B - O - B
   Pile warp thread 2: O - O - O
   Pile warp thread 3: O - O - O
   Pile warp thread 4: O - B - B

   Apron 30:   Pile warp thread 1: B - B - O
   Pile warp thread 2: O - O - O
   Pile warp thread 3: B - O - O
   Pile warp thread 4: B - O - B

   Apron 31:   Pile warp thread 1: B - O - B
   Pile warp thread 2: O - B - O
   Pile warp thread 3: O - B - O
   Pile warp thread 4: B - B - O

   Apron 32:   Pile warp thread 1: B - B - O
   Pile warp thread 2: O - O - B
   Pile warp thread 3: O - O - B
   Pile warp thread 4: B - B - B

   Apron 33:   Pile warp thread 1: B - O - B
   Pile warp thread 2: B - B - B
   Pile warp thread 3: O - O - O
   Pile warp thread 4: O - B - B

   Apron 34:   Pile warp thread 1: O - B - O
   Pile warp thread 2: B - O - B
   Pile warp thread 3: B - O - O
   Pile warp thread 4: B - O - B

   Apron 35:   Pile warp thread 1: B - O - B
   Pile warp thread 2: B - B - O
   Pile warp thread 3: O - B - O
   Pile warp thread 4: B - B - O

   Apron 36:   Pile warp thread 1: B - B -O
   Pile warp thread 2: O - B - B
   Pile warp thread 3: O - O - B
   Pile warp thread 4: B - B - B
5. Method according to Claim 4, characterized in that in a basic weave pattern repeat extending over four picks the successive working pattern repeats indicated by A, B, C and D for the pile warp threads (P1,...) preferably recur cyclically depending on the position of the three picks in the top and bottom fabric, in that if no pattern-forming pile warp thread (P1,...) is present, in the working pattern repeat apron 1 is used for the basic weave pattern repeat A, apron 2 for the basic weave pattern repeat B, apron 3 for the basic weave pattern repeat C, and apron 4 for the basic weave pattern repeat D, in that if a pattern-forming pile warp thread (P1,...) which is provided for tying into the bottom fabric is present, and in the previous pattern repeat no pattern-forming pile warp thread (P1,...) was provided, in the working pattern repeat apron 5 is used for the basic weave pattern repeat A, apron 6 for the basic weave pattern repeat B, apron 7 for the basic weave pattern repeat C, and apron 8 for the basic weave pattern repeat D, in that if a pattern-forming pile warp thread (P1,...) which is provided for tying into the bottom fabric and formed patterns in the previous pattern repeat is present, in the working pattern repeat apron 9 is used for the basic weave pattern repeat A, apron 10 for the basic weave pattern repeat B, apron 11 for the basic weave pattern repeat C, and apron 12 for the basic weave pattern repeat D, in that if a pattern-forming pile warp thread (P1,...) which is provided for tying into the bottom fabric is present, and in the previous pattern repeat a different pattern-forming pile warp thread for tying into the bottom fabric was provided, in the working pattern repeat apron 13 is used for the basic weave pattern repeat A, apron 14 for the basic weave pattern repeat B, apron 15 for the basic weave pattern repeat C, and apron 16 for the basic weave pattern repeat D, in that if a pattern-forming pile warp thread (P1,...) which is provided for tying into the bottom fabric is present, and in the previous pattern repeat a different pattern-forming pile warp thread for tying into the top fabric was provided, in the working pattern repeat apron 17 is used for the basic weave pattern repeat A, apron 18 for the basic weave pattern repeat B, apron 19 for the basic weave pattern repeat C, and apron 20 for the basic weave pattern repeat D, in that if a pattern-forming pile warp thread (P1,...) which is provided for tying into the top fabric is present, and in the previous pattern repeat no pattern-forming pile warp thread (P1, ...) was provided, in the working pattern repeat apron 21 is used for the basic weave pattern repeat A, apron 22 for the basic weave pattern repeat B, apron 23 for the basic weave pattern repeat C, and apron 24 for the basic weave pattern repeat D, in that if a pattern-forming pile warp thread (P1,...) which is provided for tying into the top fabric and in the previous pattern repeat forms patterns is present, in the working pattern repeat apron 25 is used for the basic weave pattern repeat A, apron 26 for the basic weave pattern repeat B, apron 27 for the basic weave pattern repeat C, and apron 28 for the basic weave pattern repeat D, in that if a pattern-forming pile warp thread (P1,...) which is provided for tying into the top fabric is present, and in the previous pattern repeat a different pattern-forming pile warp thread (P1,...) for tying into the bottom fabric was provided, in the working pattern repeat apron 29 is used for the basic weave pattern repeat A, apron 30 for the basic weave pattern repeat B, apron 31 for the basic weave pattern repeat C, and apron 32 for the basic weave pattern repeat D, in that if a pattern-forming pile warp thread (P1,...) which is provided for tying into the top fabric is present, where in the previous pattern repeat a different pattern-forming pile warp thread (P1,...) for tying into the top fabric was provided, in the working pattern repeat apron 33 is used for the basic weave pattern repeat A, apron 34 for the basic weave pattern repeat B, apron 35 for the basic weave pattern repeat C, and apron 36 for the basic weave pattern repeat D, the basic weave pattern repeats A, B, C and D differing from one another in the sequence of the picks, through the fact that with respect to the tension warp threads (SB; SO) the weft threads (IB1, ...; I01, ...) lie above (B) or below (O) the tension warp threads (SB; SO) of the top fabric (BW) or of the bottom fabric (OW) in the following manner:

   Pattern repeat A: B/BW - B/OW - O/BW

   Pattern repeat B: O/OW - B/BW - B/OW

   Pattern repeat C: O/BW - O/OW - B/BW

   Pattern repeat D: B/OW - O/BW - O/OW.
6. Method for weaving a face-to-face pile fabric according to Claim 4 or 5, characterized in that in the case of apron 17 the positions of pile warp thread 2 are changed to B - B - O (above - above - below) if apron 30 immediately follows apron 17, pile warp thread 2 in the case of apron 17 corresponding physically to pile warp thread 1 in the case of apron 30, in that in the case of apron 20 the positions of the pile warp thread 2 are changed to B - O - B (above - below - above), if apron 29 immediately follows apron 20, pile warp thread 2 in the case of apron 20 corresponding physically to pile warp thread 1 in the case of apron 29, and in that in the case of apron 29 the positions of pile warp thread 2 are changed to O - B - O (below - above - below), if apron 18 immediately follows apron 29, pile warp thread 2 in the case of apron 29 corresponding physically to pile warp thread 1 in the case of apron 18, and in that in the case of apron 30 the positions of pile warp thread 2 are changed to O - O - B (below - below - above), if apron 19 immediately follows apron 30, pile warp thread 2 in the case of apron 30 corresponding physically to pile warp thread 1 in the case of apron 19.
7. Method according to one of Claims 3 - 6, characterized in that, on the basis of a card design indicating a patterning of the face-to-face pile fabric to be woven, the aprons are determined by the following steps:

   (a) starting from a specific initial pick, the successive picks are divided into groups of three (working pattern repeats) and, starting from an initial index A, are provided with rising index (B, C, D) until the first working pattern repeat recurs, following which one begins again with the initial index A, the working pattern repeats being distinguished from one another by the position of the three weft threads (IB1,...) above or below at least several tension warp threads (SB, SO) and tied-in pile warp threads (P1,...) of the top and bottom fabric (BW, OW);

   b) for each working pattern repeat of the various working pattern repeats occurring-, a number of possible aprons are set up for the positions of the pile warp threads (P1,...) in each working pattern repeat; and

   c) in the conversion of the card design to aprons, for each row each point of the card design is allocated an apron each time over three picks through a derivation of the relevant working pattern repeat and through a selection of the suitable apron for this point from among a number of aprons which could be used for this working pattern repeat.
8. Method according to Claim 8, characterized in that in step b) for each possible pile warp thread configuration in a working pattern repeat several aprons are set up according to the possible combinations of each pile warp thread configuration with pile warp thread configurations from an immediately preceding working pattern repeat, following which in step c) the apron which is suitable for the combination of the present pile warp thread configuration with the immediately preceding pile warp thread configuration is selected.
9. Method according to Claim 7 or 8, characterized in that, if over three successive picks of the particular backing fabric a non-pattern-forming pile warp thread (P1,...) of the top or bottom fabric (BW, OW) always lies on the outside with respect to the fabrics of these three picks which lie opposite each other and are viewed as common fabrics, the apron is corrected in such a way for the middle pick of the three picks that the non-pattern-forming pile warp thread (P1,...) is tied in at the inside of the middle pick of the backing fabric in question.
10. Face-to-face pile fabric manufactured by the method according to one of the preceding claims.

Images