EP1607501B1 - Method and device for shedding jacquard patterned pile warp yarns in a face to face weaving machine - Google Patents

Description

The invention relates to a method and a device for shedding jacquardmustemder pile warp yarns on a Doppelflorwebmaschine with at least two superimposing weft insertion zones between adjacent shed levels, the pile threads on strands - the pattern and the selected binding accordingly - each associated with a subject level and finally after the Offenfach- Working method are moved to this level, the group of non-mustering pile threads are integrated in an upper and / or lower base fabric and the mustering pile threads are alternately incorporated in the upper base fabric and in the lower base fabric and thereby clamped between the two basic goods.

At double sheds or weaving machines with more than one weft insertion zone, it is customary to divide the warp threads participating in shedding in shed levels above, below or between weft insertion zones corresponding to the desired weave. The pile warp threads of each individual level are selected individually or in groups with the aid of shedding devices and then moved to the specified new level. The pile warp threads thereby affect the weft insertion zones at a greater or lesser distance from the movement path of the weft insertion elements.

For pile threads, the greatest possible opening angle is sought, while the binding warp threads and the tension warp threads very closely affect the path of the weft insertion elements or the weft insertion zone and guide them.

All Polkettfäden be led for the purpose of shedding through eyelets on strands, which follow a pattern drive. If a strand is assigned to a specific layer, its stroke always ends in the same position. This position is determined by the pre-set position and the stroke of the knife boxes or finger rakes of the jacquard machine.

By the DE 199 24 689 C1 a device has become known by means of which the shed opening angle in the area of the inguinal warp threads limited - held. These compartment limiters each act on the two outer compartment levels and limit their opening angle in such a way that a thread end, which is not marked by means of nozzles, is held sufficiently securely therein during the insertion of the weft.

U. a. through the EP 1 069 218 B1 For example, a device is known which has a separate shed drive for shedding warps on weaving machines having a single weft insertion zone for each individual warp thread. The actuators described for this purpose consist of a motor whose drive wheel is connected to a cord (harness). The stroke size can be varied depending on the distance of the respective strand of the Schussanschlagkante to secure the necessary shed opening angle.

By doing US 6 293 315 B1 a similar device is described in which the drive wheel of the motor is designed as part of a pulley.

These last mentioned documents - DE 199 24 689 C1 . EP 1 069 218 B1 and US 6 293 315 B1 - deal exclusively with weaving machines which have only a single weft insertion zone and only two shed levels. The fabric made on these machines is a flat fabric. The height of the shed is relatively low on these machines.

On weaving machines with two or more weft insertion zones, as out EP-A-0 848 097 are known, the entire compartment height increases significantly. A use of individual actuators for the shedding of the pile threads on double pile looms is not possible. The mostly very voluminous and run in a very small space pile threads cling to each other and do not allow a reduction in the opening angle.

At the required large shed opening angles, the energy required for the individual actuators and thus their heating increases. In the necessarily tight packing of the actuators, the problem of cooling is of particular importance. An economical operation is not given.

To reduce the compartment height of the shed to Doppelflorwebmaschinen you have for reasons of performance in the DE 32 05 227 A1 proposed to guide the batten on a parallelogram. By this design, one can limit the height of the batten and their way clearly. The leads leading the pile threads can thus be brought closer to the weft insertion zone. The stroke of the strands is reduced. However, the bin opening angle remains constant.

The use of individual rotating actuators, which wind up the harness cords on a roll, even with the use of such a guided batten is not yet possible.

The object of the present invention is to modify the design of the shed so that, if necessary, using individual actuators for the control of the pile threads, the shed height of the pile threads can be reduced without them clinging to each other with the same warp density in shedding.

According to the invention this object is achieved by the method according to claim 1.
With the modification of the shed according to the invention it is achieved that the differences of the technical dimensions are compensated by the different integration positions on the different basic goods, that the pile threads, when they set as Totpol or as beginning with the patterning Polfaden, perform a smaller stroke in the outer compartment.
With this new type of shed formation, the advantages of the individually controlled actuators can also be transferred to double pile looms, on which voluminous pile threads are integrated in high density and which has more than one weft insertion plane.

Another advantage of the invention is that the shed reduced in this way allows the use of a significantly reduced in size and mass batten. This leads to an increase in the speed of the loom. Also mounted on the sley, protruding into the shed elements - such as guide teeth for the weft insertion member, auxiliary nozzles in Airjet weft insertion - can be made shorter and thus lighter and more stable.

With the staggering of the pile threads in their end positions according to claim 2, the pile threads can be detached from each other during the Fachvertrittes without clinging even with reduced dimensions.

The claim 3 specifies the claim 1 with respect to the way how you can - reduce the technical height of the pile threads - by the different strokes in the outer compartment.

The staggering of the end positions of the strands also in the outer compartments - according to claim 4 - reduces the staple effects also in these areas. The latter is especially important if the newly mustering pile threads in the outer compartment are released from the respective Totpolstrang.

With the modification of the technical representation according to claim 5 one can solve clinging pile threads with higher reliability from each other, without increasing the shed in the range of movement of the sley in the long run.

The procedure defined in claim 6 effectively avoids a temporary jamming of pile threads in the region of the central compartment and thus effectively prevents stapling of the pile threads.

The claim 7 shows a modified method for solving the problem. Instead of the differentiated positioning of the pile threads in the outer compartments as a function of the last binding in one of the basic goods, a mechanical compartment limiter is used here, which limits the range of motion of those pile warp threads in the area of the sley in their compartment height, which change from their own basic fabric into the adjacent outer compartment ,

The device described in claim 8 is used in a simple manner to realize the claim 1. The modification according to claim 9 supports the release of the warp threads from each other.

The device for carrying out the method according to claim 7 defines the claim 10. Claim 11 shows an advantageous design and arrangement of the shed limiter for carrying out the method according to claim 7.

Fig. 1

einen schematischen Querschnitt durch das Webfach einer Doppelflorwebmaschine,

Fig. 2

ein Bewegungsschaubild für einen Polfaden der Oberware,

Fig. 3

ein Bewegungsschaubild für einen Polfaden der Unterware,

Fig. 4

eine Darstellung eines Doppelflorgewebes mit dem Verlauf der Polfäden beim Polfadenwechsel,

Fig. 5

einen schematischen Fachquerschnitt analog zur Fig. 1 mit variierter Steuerung der Polkettfäden und mit Webfachbegrenzer,

Fig. 6

ein Bewegungsschaubild für einen Polfaden der Oberware passend zur Fig. 5,

Fig. 7

eine schematische perspektivische Darstellung eines Webfachbegrenzers,

Fig. 8

eine Detailansicht zur Führung der Webfachbegrenzer mittels Traglitze,

Fig. 9

eine detailiertere Darstellung des Webfaches, aus der die Staffelung der Litzenösen in den einzelnen Fachebenen ersichtlich ist,

Fig. 10

eine schematische Darstellung des Antriebes einer Litze mittels rotierendem Betätigungselement,

Fig. 11

ein Bewegungsdiagramm von Polfäden während eines Fachvertrittes unter Verwendung eines zeitlich begrenzten Überhubes und

Fig. 12

Bewegungsdiagramme von Polfäden während eines Fachvertrittes mit zeitlicher Staffelung des Durchganges durch die Mitte eines Webfaches.

The invention will be explained in more detail below with reference to exemplary embodiments. In the accompanying drawings show:

Fig. 1

a schematic cross section through the shed of a double pile loom,

Fig. 2

a movement diagram for a pile thread of the upper fabric,

Fig. 3

a movement diagram for a pile thread of the lower fabric,

Fig. 4

a representation of a double pile fabric with the course of the pile threads at the pile thread change,

Fig. 5

1 shows a schematic cross-section similar to FIG. 1 with varied control of the pile warp threads and with shed-limiter, FIG.

Fig. 6

a movement diagram for a pile thread of the top fabric suitable for Fig. 5,

Fig. 7

a schematic perspective view of a Webfachbegrenzers,

Fig. 8

a detailed view of the guidance of the shed limiter by means of support strand,

Fig. 9

a more detailed representation of the shed showing the staggering of the Litzenösen in the individual levels,

Fig. 10

a schematic representation of the drive of a strand by means of a rotary actuator,

Fig. 11

a movement diagram of pile threads during a subject use using a temporary overtravel and

Fig. 12

Movement diagrams of pile threads during a subject representation with time staggering of the passage through the center of a shed.

In Fig. 1, the principle of the present invention is according to a first Solution variant shown.

The double pile fabric 6 is drawn off and guided between the plates of the fabric guide 1, beginning at the weft stop edge 11. The pile threads are set in either the upper ground fabric 61 or the lower ground fabric 62. The non-eye pile threads 71 - also called totpole - the top fabric 61 are regularly incorporated according to FIG. 4 between back shots 81 and inner shots 82 of the upper 61. The same applies to the non-eye pile threads 72 or tot poles of the lower fabric 62. These are integrated between the back shots 83 and inner shots 84 of the lower base product 62.

Will one of these previously not mustering pile threads 71; 72 selected for patterning, then this selected pile thread 73 - unlike the other non-mustering pile threads - on the weft insertion zone 51 and under the weft insertion zone 52 to the outside (up or down) moves. The pile yarn 73 stretches from its last binding in its base fabric 61 to the upper right and tangentially affects the adjacent weft insertion zone 51. The eyelet 311 of this pile yarn 73 leading strand 31 is located on the additional inner upper level O2, by the two defined points (last bond to its base 61 and the tangent to weft insertion zone 51).

The pile threads 71 and 72 occupy the same position during the pole-dead binding when they bind outside around the inner weft of their fabric.

The shed forming in the movement region of the reed 21 is significantly smaller than the shed that would form when the loop of the strand 31 - as hitherto usual - would move into the position O1. Compare this in Fig. 1, the levels 730 and 740. The upper and the the lower compartment limit is shifted to the middle of the compartment by the difference amounts a) and b) (by up to 10 mm each). The sley 2 or the reed 21 can be shortened or reduced by about this amount. The sley 2 and the reed 21 is lighter and more stable.

If this newly selected pile yarn 73 continues its required movement from the position O2, the eyelet 311 of its strand 31 leading to it first moves, as shown in FIG. 2, into the outer, lower level U1 and then into the outer upper level O1. This control of the pile yarn does not affect the effective shed height, because the last binding location of the patterning pile threads is located in the opposing base fabric 61, 62, respectively.

If a previously not mustering pile thread 74 of the lower base fabric 62 is selected for patterning, this pile thread 74 - coming from the middle compartment M2 coming with the eyelet 321 of his strand 32 first to the shortened stroke H1 'in the lower level U2 , The plane in which the pile thread 74 extends begins at the last binding point in the lower base fabric 62 and tangentially engages below and outside the lower weft insertion zone 52.

In this way, the shed in the batten area by the difference amount b) is formed smaller than in a shedding in the conventional sense in this case. The eyelet 321 of the strand 32 was moved in a conventional manner in the level U1 and the pile thread extended so far in the plane 740th

The further course of the movement of the eyelet 321 on the strand 32 is shown in FIG. 3. The pile thread 74 is moved in the following tours in each case in the outer compartment levels O1 and U1. The shed in the area of Web leaf 21 is not larger in this case, because the previous binding point of the pile threads 74, 75, 76 is located in the respective opposite base fabric 62, 61.

By the term "contacting a weft insertion zone" as used herein we do not mean the immediate tangling of the weft insertion member web. At a small distance, this web usually affects the binding warp threads 611, 621 or the so-called tensioning chain (see FIG. 9), which guide these weft insertion elements in the shed. The pile threads, which are usually supplied at a lower tension and often tend to staple, affect the weft insertion zone outside the binding or Spannkettfäden.

Reducing the shelf height in the manner shown could result in the case of special pile materials for clamping the pile threads together and thus preventing the compartment opening. This case occurs when a newly selected for patterning pile thread must be drawn from the same amount of Totpolstrang binding for a long time. This usually takes place from the middle compartment into the outer compartment assigned to the respective own basic product.

This disadvantage is counteracted by arranging the pile threads in the middle compartment M1, M2 staggered in height during the weft insertion, so that the pile threads are not positioned parallel to one another and not side by side within a riveting gap.

In Fig. 1, this staggering is indicated by the eyelet positions in the middle compartment. It is convenient to vary this staggering in adjacent relet gaps. Of considerable importance for the avoidance of the staple effect is also the so-called. Mittendurchgang when the mustering pile threads change from one outer compartment into the other outer compartment or Totpole between the outer and middle compartment. Even in these phases, it is useful when crossing the middle compartment or the center of the pile, the pile threads staggered successively to meet each other. The stapling is thereby significantly reduced and you can work in total with reduced tray height and with a reduced bin opening angle without clinging pile threads and these stapled pile threads are penetrated by the weft insertion element. See also the comments on the figures 11 and 12.

However, this control described the pile threads at the beginning of their patterning or during patterning is not feasible with the usual Jacquard machines.

However, it is possible to realize the control of the necessary shedding movements by so-called. Actuators or motors 37, each associated with a pile warp thread or its strand (see FIGS. 10 and EP 1 063 326 B1 ).

The motors 37 described therein receive by the central control a corresponding differentiated control program with a shortened stroke, with a staggered start position and with a time-differentiated center passage.

H1; H1':

erfolgt aus einer der gestaffelten mittleren Fachpositionen zwischen M1 und M2 in eine Fachposition O2 und U2 bzw.

H2; H2':

aus einer Fachposition O2 nach U1 oder aus einer Fachposition U2 nach O1.

The shortened stroke

H1; H1 ':

takes place from one of the staggered middle specialist positions between M1 and M2 into a specialist position O2 and U2 or

H2; H2 ':

from a specialist position O2 to U1 or from a specialist position U2 to O1.

These and other common control programs for the motors 37 may be in each stroke depending on the position of their strand 31 within the range 3 of the jacquard-controlled strands 31 are still varied such that the shed in the range of movement of the reed 21 does not exceed a predetermined maximum size.

If the Poffaden is returned at the end of his pattern in his basic commodity, he moves into the middle compartment M1 and there is the group of non-mustering pile threads again assigned in its staggering and follows from here on the control program or the differentiated control programs for the so-called Totpole 71 ; 72nd

It should be noted again here that even during the binding of the pile threads as Totpol the shortened stroke H1, H1 'is then executed when they bind outside on the respective inner weft 82, 84.

In Fig. 5, a second variant of the method for limiting the height of the compartment in the range of movement of the sley 2 is shown. Immediately behind the rearmost position of the sley 2 and its reed 21 web shedder 4 are arranged. These shed limiters 4 are located in one of the planes which extend from the last binding on the own base fabric 61, 62 as an outer tangent to the adjacent weft insertion zones 51, 52 upwards or downwards.

These planes are characterized by the portions of the pile threads 73a and 74a, respectively. When using the shed limiters 4, 41, 42, the stroke size H of the strands 31, 32 need not be differentiated to the inner and outer outer compartments. However, here too, the staggering of the specialist positions in the central compartment M1, M2 and the staggered passage through the central compartment M1, M2 appear necessary.

The shed can be kept small even in this embodiment in the range of movement of the reed 21. The dimensions of the sley 2 are reduced and allow a high-speed operation of the loom.

In view of the very limited space between the rearmost position of the reed 21 and the jacquard-controlled strands 31, 32 and in view of the fact that the space 3 in the area of the jacquard strands 31, 32 must be accessible for operations, it prepares difficulties gestellfest Fachbegrenzer 4 in this area provided.

According to an advantageous embodiment of the present invention, the shed limiters 4 are formed as tension wires 41, which are anchored on both sides of the shed using clamping elements 410, 420 (see Fig. 7 and Fig. 8).

These tension wires 41 are guided at intervals along the shed with the aid of support strands 43, which are equipped with eyelets 44 and 45. These in turn are fixed to the frame fixed to upper support rails 47 and springs 46 on lower clamping rails 48. The tension wires 41; 42 are along their axis by means of clamping elements 410; 420 biased so that the number of trunnions 43 is limited. This arrangement of the weaving limiter 4 is sufficiently stable for the intended subject limitation and does not hinder the drawing of pile threads 71 to 76 into the eyelets 311, 321 of the strands 31, 32.

While in the description of Figures 1 and 5, the staggering of the individual end positions and passages of the pile threads in the middle compartment and in the outer compartments was shown only very schematically, is from Fig. 9 on a scale slightly stretched example of a shed staggering the eyelet positions in Middle compartment M shown. The left triad the strands 31 is associated with the pile warp threads of the upper fabric 61, while the strand group 32 is associated with the lower base fabric.

The marked eyelet positions 311 M, 321 M in the region of the middle compartment M1 are, on the one hand, those positions of the eyelet 311, 321 which occupy the pile threads in the middle compartment M1 as a temporary end position. If these pile threads are patterned, then these positions are approximately those which occupy the respective pile threads during the technical representation at a uniform time.

We can see from this that only very few of the pile threads encounter a riveting gap of the reed at the same time. The stapling of the pile threads together is significantly limited in such an embodiment. The mutual influence of the pile threads within a Rietlücke is limited to a minimum.

A similar operation is realized in the outer compartments. If the dead poles in the upper outer compartment bind, the eyelets of the strands are in position 311/02. In this position, this group of three has such a position that, with tense pile threads, none of them is guided within a Rietlücke immediately adjacent to a second.

If a patterning pile thread is removed from this strand of pile threads in the outer pocket, then the staple effect is also limited there. If we look at the patterning pile threads in the respective outer compartment O1, U1, we see a similar staggering of the pile threads, as we described them in relation to the tot poles in the outer compartment O2, U2. However, it is not absolutely necessary to carry out a corresponding staggering in this area as well, because usually only one of the pile threads at a time is used in this subject level.

The similar staggering has been used here so that the programming of the individual actuators can be simplified by the use of uniform program complexes.

In Fig. 10 is again schematically the manner of driving the strands 31 for the pile threads by means of an actuating element - here a motor 37 - shown. The strand 31 in the lower area leads in its eyelet 311 the pile thread. One of the strand 31 upwardly leading rope 33 is guided over a loose roller 34 and is fixed to the frame-fixed bar 49. The axis of the loose roller 34 is connected by a further cable 35 with the cable drum 36 of the actuating element 37. The cable drum 36 has spiral grooves in which the rope 35 can be stored and released in an orderly manner.

By using the loose roller 34, the size of the cable drum 36 is kept to a minimum. As a disadvantage, however, it should be noted that in this case the required drive torque is increased. This in turn leads to a significant increase in the dimensions of the motors 37. It is up to the expert to decide whether he realizes the required to double weaving larger sizes with or without loose role 34.

FIGS. 11 and 12 once again show the movement diagrams according to which the pile threads are moved in a controlled manner during the specialist representation by the actuating elements. The technical representation takes place essentially in the period from leaving the shed through a weft insertion element S in a first tour and the reentry of the weft insertion element S1 in the shed in a second tour instead

In Fig. 11, the motion diagrams F and F1 show the usual ones Movement form. It begins and ends in the respective prescribed level. When controlling the shed formation of pile threads, the staple effect must be prevented. For this purpose, the movement diagrams F3 and F4 is changed in such a way that, at least in the region of the end position of the movement, an overstroke H3 is executed for a limited time before the pile thread finally remains in its new compartment plane. An overrun H4 can also be carried out before a specialist representative. Depending on the pole material used so that a pile thread can be better removed from a thread strand.

FIG. 12 shows movement diagrams F5 to F7 of pile threads which at different times intersect the middle of the fabric in the region E and other pile warp threads. It goes without saying that even in these cases an overstroke can be used, as described with reference to FIG. 11.

LIST OF REFERENCE NUMBERS

1

tissue management

11

Weft stop edge

2

batten

21, 21 '

reed

3

Jacquardlitzenbereich

31

braid

311

eyelet

32

braid

321

eyelet

33

rope

34

loose roll

35

rope

36

cable drum

37

Engine, actuator

4

Webfachbegrenzer

41

tension wire

410

clamping element

42

tension wire

420

clamping element

43

Traglitze

44

eyelet

45

eyelet

46

feather

47

retaining rail

48

tensioning rail

49

rail

51

Weft insertion zone (upper)

52

Weft insertion zone (lower)

6

tissue

61

Basic goods, upper

62

Basic goods, lower

(7)

pile threads

71

Pole threads, not mustering, Totpol, Oberware

72

Pole threads, not eyeing, Totpol, Unterware

73

Pole threads, selected for patterning, new / level

730

Pole threads, selected for patterning, old

73a

Pile threads, selected for patterning, with shed edge delimiters; from own goods / level

73b

Pile threads, selected for patterning, with shed edge delimiters; from foreign goods

74

Pole threads, selected for patterning, new / level

740

Pole threads, selected for patterning, old

74a

Pile threads, selected for patterning, with shed edge delimiters; from own goods / level

74b

Pile threads, selected for patterning, with shed edge delimiters; from foreign goods

75

Polfaden, eyeing

76

Polfaden, eyeing

81, 82

weft

83,84

weft

91

Filling chain / tensioning chain - upper fabric

92

Filling chain / tensioning chain - lower fabric

01

upper, outer compartment level

02

upper, inner compartment level

M1

middle level (upper product)

M2

middle level (lower product)

U1

lower, outer level

U2

lower, inner level

H

stroke

H1, H1 '

shortened stroke

H2, H2 '

Sample stroke, shortened

H3, H3 '

blowout

a, b

difference

E, E1

Intersection area / center of expertise

F, F1 ... F7

Motion charts

F5 '... F7'

Motion charts

S

Weft entry - end - 1st tour

S '

Weft insertion - beginning - 2nd tour

Claims (11)

1. A method for shedding jacquard pattern-producing pile warp threads on a double-pile loom, with at least two weft insertion zones (51, 52) arranged one above the other between adjacent shed planes each time,
   wherein the pile threads before each web insertion - corresponding to the pattern and the selected weave - by means of healds (31, 32) are each associated with a shed plane (O, M, U) and finally are moved away using the open-shed method,
   the group of non-pattern-producing pile threads (71, 72) being tied in an upper and/or lower back cloth (61, 62) and the pattern-producing pile threads (75, 76) being tied alternately in the upper back cloth (61) and in the lower back cloth (62) and finally being tensioned between the two back cloths (61, 62),
   characterised in that
   the healds (31, 32) are driven by means of electric actuating elements (37) which are controlled according to programs which can be selected, and
   that the stroke height of the healds (31, 32) guiding the pile threads is varied dependent on the last tying in one of the two back cloths (61, 62) such that the depth of shed in the region of the rearmost end position of the sley (2) at most corresponds to that predetermined by the respective pattern-producing pile threads (75, 76).
2. A method according to Claim 1, characterised in that
   the end positions and/or the passage positions of the pile threads in the region of the centre shed (M1, M2) are staggered such that regularly not more than two pile threads which are associated with a reed space are or encounter each other simultaneously in one plane.
3. A method according to Claim 1 or 2, characterised in that
   the pile threads (71, 72) tied for the last time as being non-pattern-producing in their own back cloth (61, 62) or as dead pile always, when they are guided into the outer shed (O, U) associated with their own back cloth (61, 62), perform a shortened stroke (H1, H1') in their own inner outer shed (02, U2) in each case, and
   the shortened stroke (H1, H1') ends in a plane (73, 74) which begins at the last tying point of the own back cloth (61, 62) and which externally forms a tangent to the outer weft insertion zone (51, 52) each time which is located at approximately the same height.
4. A method according to Claim 1 or 2, characterised in that
   the end positions of the pile threads in the outer sheds are also staggered such that regularly not more than two pile threads which are associated with a reed space are or encounter each other simultaneously in one plane.
5. A method according to Claim 1 or 2, characterised in that
   the healds guiding the pile threads upon a shed displacement into an outer shed in the region of the outer shed perform a brief excess stroke (H3, H3').
6. A method according to Claim 1 or 2, characterised in that
   the healds guiding the pile threads of a reed space pass through the centre shed (M) staggered over time.
7. A method according to Claim 1, characterised in that
   the healds (31, 32) are driven by means of electric actuating elements which are controlled according to programs,
   the pile warp threads (73, 74) in accordance with the pattern are always guided in one of the outer shed planes (O1, U1),
   the shed

   - between the sley (2) and the healds (31, 32) in the region of two planes (73a, 74a)

   -- which begin at the last tying points of one of the back cloths (61, 62) and which externally, i.e. above or below, form a tangent with the outer weft insertion zone (51, 52) each time which is located at approximately the same height,

   - across the width of the shed is reduced by a differential amount (a, b) by means of upper and lower shed delimiters (4, 41, 42) and

   that the end positions and/or the passage positions of the pile threads in the region of the centre shed are staggered such that regularly not more than two pile threads which are associated with a reed space are or encounter each other simultaneously in one plane.
8. A shedding device for jacquard pattern-producing pile warp threads on a double-pile loom
   with at least two weft insertion zones (51, 52) arranged one above the other, each of which is associated with the region of one of the back cloths (61, 62) of the double-pile fabric (6),
   with shedding elements which have healds (31, 32) with eyelets (311, 321) for guiding the pile threads (7),
   wherein the healds (31, 32) - corresponding to the pattern and the weave - before each web insertion can be associated with one of at least three shed planes (O, M, U) by means of selection elements and can be moved thereto by means of drive elements,
   for performing the method according to Claim 1,
   characterised in that
   the outer shed planes (O, U) each time are defined by two vertical positions (01, 02; U1, U2) of the healds which differ from each other,
   the outer vertical position (01, U1) of the heald (31, 32) each time is defined by a plane

   - which begins at the last tying point of one of the back cloths (61, 62) and externally forms a tangent to the weft insertion zone (52, 51) in the region of the other back cloth (62, 61),

   the inner vertical position (02, U2) of the heald (31, 32) each time is defined by a plane (73, 74) which begins at the last tying point of one of the back cloths (61, 62) and which externally forms a tangent to the outer weft insertion zone (51, 52) each time which is located at approximately the same height, and
   that the drive elements for the healds (31, 32) are individually controllable motors which can be moved by electrical control either into the inner (02, U2) or into the outer vertical position (01, U1) according to different programs.
9. A device according to Claim 8, characterised in that
   at least the eyelets of those healds the pile threads of which are positioned in the centre shed M1, M2 are arranged vertically staggered.
10. A shedding device for jacquard pattern-producing pile warp threads on a double-pile loom
    with at least two weft insertion zones (51, 52) arranged one above the other, each of which is associated with the region of one of the back cloths (61, 62) of the double-pile fabric (6),
    with shedding elements which have healds (31, 32) with eyelets (311, 321) for guiding the pile threads (7) and
    with a sley (2) with reed (21),
    for performing the method according to Claim 1,
    characterised in that
    upper and lower shed delimiters (4, 41, 42) are arranged between the reed (21) of the sley (2) and the region of movement of the healds (31, 32), and
    that the stops of the shed delimiters (4, 41, 42) which delimit the shed are arranged on one each time of planes (73b, 74b) which begin at the last tying point of one of the back cloths (61, 62) and which externally form a tangent with the outer weft insertion zone (51, 52) each time which is located at approximately its height.
11. A device according to Claim 10, characterised in that
    the shed delimiters (4) consist of guide wires (41, 42) oriented parallel to the beat-up edge (11), which wires at intervals are guided through eyelets (44, 45) which are fastened to vertically immovable, tensioned supporting healds (43).

Images