EP2224046A1 - Plastic heald - Google Patents

Abstract

The heddle (7) has a heddle body made of plastic and forming a thread lug region (9) with a thread lug (10) that is terminated by two bases (12, 13). Guiding surface sections with two guiding surfaces (35) are arranged on the thread lug region at opposite ends. Shafts (23, 24) are attached on the surface sections, and a cross section of the surface sections includes arms (32, 33) arranged parallel to each other and supporting the guiding surfaces. A connection bar (34) connects the arms, encloses the arms with an angle, and has a thickness that differs from the thickness of the arms.

Description

The invention relates to a heddle for weaving machines. Weaving machines have a large number of strands that serve the Kettfadenführung. Each heald has at least one thread eye through which a warp thread passes. Additional warp threads pass through the gaps between adjacent strands.

To improve healds various proposals have been made. Usually healds of metal, such as thin strips of sheet steel, formed.

The DE 43 36 362 C1 discloses a heddle made of steel strip or alternatively of fiber-reinforced plastic material. To the heald includes a thread eye area containing a delimited by two webs thread eye. The two webs are oriented parallel to each other. Seen longitudinally to the warp, the two webs are laterally offset from each other. Above and below the thread eye area, transition areas connect to the thread eye, which merge into shallow shafts. The transition areas are inclined against the warp direction. As a result of this inclination, warp threads arranged between the heddle wire run along the edges of the transitional area.

Another heald is out of the US 5,348,055 known. This heddle consists of a flat metal strip, which is provided at the end with eyelets. Approximately in the middle of an opening is formed, which is bounded by two webs. Forming the region around the thread eye a thread eye area. The webs are bent out of the plane of the flat metal strip so that they are laterally offset from one another and spaced laterally relative to the warp direction to form a thread eye. The straight and flat webs go in each case in the region of the upper and lower end of the thread eye in the shafts. As a result, the thread eye has seen in the thread longitudinal direction at the top and bottom each have a sharp corner.

Next discloses the DE 10 2005 030 632 A1 a plastic heddle whose thread eye is bounded by two laterally staggered webs. Above and below close to the eye thickened, formed as ramps areas that serve to keep adjacent healds at a distance and between the healds running threads gently to the respective thread eyes over.

It is an object of the invention to provide a slim, in particular the outside of the strand running along the thread-saving plastic heddle.

This object is achieved with the heddle according to claim 1:

The plastic heddle according to the invention has a heddle body with a thread eye region and two guide surface sections adjoining this, which merge into the main body of the strand, ie into its shafts. The thread eye region has one of two mutually parallel webs limited thread eye. From the webs guide surfaces extend over the Leitflächenabschnitte to the Litzenschäften. An inventive feature of the plastic heald lies in the formation of the Leitflächenabschnitts. This has a cross section at which distinguish three zones. A middle zone of the cross-section forms a straight or curved connecting web, from the two ends of which legs extend away on both sides. On the flanks of the legs, the guide surfaces are formed. In cross-section, the two edges of the legs, which mark the guide surfaces, arranged on mutually parallel lines.

By this measure, a Leitflächenabschnitt is obtained, which requires very little material and thus leads to a low weight of the heald. The guide surfaces or the above-mentioned lines are not only parallel to each other, but they are also parallel to the Fadenaugendurchgangsrichtung, which can be equated approximately with the warp direction. This direction is also parallel to the large flat sides of the Litzenschäfte and preferably to the large flat sides of the webs, which limit the thread eye. By this measure, the running between the healds warp strands on the flanks of the heald along, they are each in contact with a surface, but not one edge of the heald. This reduces wear on the heald and the likelihood of thread damage. It can be processed with the plastic heddles according to the invention sensitive threads. Even sharpening the edges of the heddle by increasing wear of the heald or other influences hardly leads to thread damage.

The warp direction, to which the large flat sides of the Litzenschäfte and the guide surfaces of the Leitflächenabschnitts are preferably oriented in parallel, is determined by the longitudinal direction of a warp with a closed shed. This "closed compartment position" is given when all heddles are in the same position.

The webs limiting the thread eye and the legs of the Leitflächenabschnitts each consist of flat material of preferably matching thickness. Also, the transition from the large flat sides of the shafts to the guide surfaces and to the outer sides of the thread eye limiting webs is preferably smooth and continuous. Further preferably, the thicknesses of the guide-bearing legs and the thicknesses of the shafts coincide with each other.

Optionally, the connecting web formed on the guide surface section may have a thickness deviating from the thickness of the legs at at least one point. This measure opens up wide creative freedom and makes it possible to form the Leitflächenabschnitte on both sides not complementary. This has the consequence that adjacent healds can not lie flat in one another. The non-complementary shaping of the guide surface sections is thus used as a means to keep adjacent healds at a distance. This has advantages, in particular when using water weaving technology. It prevents the adhesion of adjacent strands in the thread eye area.

For the formation of such non-complementary guide surfaces, it may also be advantageous if the width of the guide surface in the region of the transition to the respective web is smaller than in the region of the transition to the respective strut shaft. The change in the width of the guide surface can be made continuously from its first end, ie from the web-side end, to its second end, the shaft-side end. The width of the guide surface at its first end may be the width of the respective web and the width of the Guide surface at its second end may correspond to the width of the shaft of the main body of the heald.

The connecting web preferably has a triangular outline in plan view. It may be provided with a curvature or, as it is preferred, also just trained. It can have an increasing thickness towards the shaft.

While the fulcrum portion has on both sides thereof shapes which are preferably not complementary to each other, the thread eye may have mating contours complementary to one another on both its sides.

The heald may be provided with other spacer means. Such a spacer means may for example be arranged on the end eyelet or elsewhere. Such spacer means are formed for example by projections, nubs, webs or the like, which can be arranged on a side surface of the heald.

• Figur 1 zwei Webschäfte einer Webmaschine, in schematisierter Darstellung,
• Figur 2 eine erfindungsgemäße Weblitze, in ausschnittsweiser perspektivischer Darstellung mit zwei Kettfäden,
• Figur 3 eine Endöse der Weblitze nach Figur 2, in perspektivischer schematisierter Darstellung,
• Figur 4 die Weblitze nach Figur 2 mit Veranschaulichung der Ausrichtung verschiedener Teile derselben, in perspektivischer Darstellung.,
• Figur 5 die Weblitze nach Figur 4, in einer ausschnittsweisen Seitenansicht,
• Fig.6-10 verschiedene Querschnitte der Weblitze nach Figur 5 und
• Fig.11-14 Weblitzen mit Abstandshaltemitteln in verschiedenen Ausführungsformen.

Further features of advantageous embodiments of the invention are the subject of the description, the drawing or claims. The description is limited to essential aspects of the invention and other conditions. The drawing is to be used as a supplement. Show it:

• FIG. 1 two healds of a loom, in a schematic representation,
• FIG. 2 a heddle according to the invention, in a fragmentary perspective view with two warp threads,
• FIG. 3 an end loop of the heald after FIG. 2 in a perspective schematic representation,
• FIG. 4 the heald after FIG. 2 with an illustration of the orientation of different parts thereof, in perspective.,
• FIG. 5 the heald after FIG. 4 in a fragmentary side view,
• Fig.6-10 different cross sections of the heddle after FIG. 5 and
• Fig.11-14 Healds with spacers in various embodiments.

In FIG. 1 two healds 1, 2 of a loom are shown, which are reciprocally moved up and down to run two of warp threads 3 existing warp sheets 4, 5 up or down from the warp thread level and so open a shed 6. The warp threads 3 are assigned to the healds 1, 2 healds 7, one of which in FIG. 2 partial and separate is shown. The heald 7 is a preferably formed in one piece as a narrow elongated strip plastic body. At the upper and preferably also at its lower end, one in each case FIG. 3 exemplified end eyelet 8 may be arranged. The end eyelet 8 may be integral with the heald 7 or a separate element attached thereto.

The heddle 7 has a thread eye region 9 with a thread eye 10. The thread eye 10 serves to guide a warp thread 3a, which defines a Kettfadenlängsrichtung 11. The warp direction 11 corresponds to the longitudinal direction of the warp thread 3a, if it is led out neither up nor down from the warp thread level - so the weaving shank in question is in closed-Fachstellung. FIG. 2 FIG. 3 illustrates another warp thread 3b that is not penetrated by the thread eye 10 that is in FIG. 2 illustrated healds 7, but through the thread eye of another heald of another weaving shank leads. The warp 3b passes through the between the heald 7 after FIG. 2 and their adjacent heald formed gap. The thread eye 10 is bounded by two webs 12, 13 which are spaced apart in the warp longitudinal direction 11 and in a direction oriented transversely thereto and parallel to one another. On the webs 12, 13 are outside flat sliding surfaces 14, 15 are formed, which in particular also made FIG. 6 can be seen. FIG. 6 shows the section AA of in FIG. 5 shown in side view heald 7.

The length of the sliding surfaces 14, 15 extends over the entire thread eye region 9, which in FIG. 4 is marked on the heald 7 between two dashed lines 17, 18 and ends at these lines. The lines 17, 18 thus correspond to the ends of the thread eye portion 9. At the thread eye 10 close with rounded transition wall portions 19, 20, the thread eye 10, as from FIG. 2 can be seen, close up and down. The wall sections 19, 20 still belong to the thread eye region 9. The lines 17, 18 form the end thereof. There, the thread eye region 9 in each case in a Leitflächenabschnitt 21, 22 via, to the shafts 23, 24 of the main body of the heald 7 connect. The shafts 23, 24 lie in a common plane, preferably in the end 8 after FIG. 3 is arranged. The webs 12, 13 are in FIG. 4 arranged above or below this level.

Out FIG. 5 in conjunction with the FIGS. 6 to 10 In particular, the formation of the guide surface portion 22 is apparent, the following description applies to the guide surface portion 21 accordingly. Both guide surface sections are arranged symmetrically with respect to the yarn eye 10 and formed.

How out FIG. 6 can be seen, the sliding surfaces 14, 15 define an outer thread eye width 25 which is greater than twice the thickness 26 of each web 12, 13. The sliding surfaces 14, 15 go on rounded edges 27, 28 in narrow sides, whose in the yarn longitudinal direction 11 to be measured Distance 29 is preferably greater than, or equal to, width 30 (FIG. FIG. 4 ) of the shaft 23 (or 24) of the main body of the heald 7 is. The distance between the mutually facing edges of the webs 12, 13 sets a to be measured in the yarn longitudinal direction 11 Öhrweite 31 a, the is preferably greater than the width of the sliding surfaces 14 and 15, respectively.
The distance of the inner surfaces 14a and 15a of the sliding surfaces 14 and 15 defines a transverse to the yarn longitudinal direction 11 to be measured Öhrweite 31b, which is preferably less than or equal to the thickness 26 of the sliding surface 14, 15.

FIG. 7 illustrates the cross-section at the end of the thread eye portion 9 to the Leitflächenabschnitt 22 (section BB of FIG. 5 ). Here, the thickness to be measured between the ends of the sliding surfaces 14, 15 is just as great as the thickness 25. The cross section has a cranked shape. To her belong two straight legs 32, 33, which are interconnected by a connecting web 34. The outer surfaces of the webs 32 and 33 preferably form trapezoidal guide surfaces 35, 36 whose cut edges are parallel to each other. The cut edges are thus in FIG. 7 dotted lines parallel to each other 37, 38. The connecting web 34 is at an acute angle α ( FIG. 8 ) to lines 37, 38.

The distance between the guide surfaces 35, 36 or between the lines 37, 38 decreases along the Leitflächenabschnitts 22 to the shaft 24 of the main body of the heald 7 and ends in its large flat side 47. This shows the sequence of cuts CC, DD and EE in the FIGS. 8 to 10 , In the entire region of the guide surface section 22, the guide surfaces 35, 36 are preferably arranged parallel to the warp thread longitudinal direction 11. The width of the guide surface 35 takes, as FIG. 5 shows and by comparing the FIGS. 8 and 9 can be seen, starting from the thread eye region 9, starting from the shaft 24 of the main body of the heald 7 towards. The same applies to the guide surface 36. Preferably, the easier illustration remains only in FIG. 8 entered angles α of the connecting web portion 34 to the Kettfadenlängsrichtung 11 over the entire length of the Leitflächenabschnitts 22 constant. The Kettfadenlängsrichtung 11 is parallel to the lines 37, 38th In FIG. 8 the angle of the connecting web 34 is characterized by its center line 39. The angle α illustrated there agrees with correspondingly entered angles in FIG FIGS. 7 and 9 match.

Like a comparison of FIGS. 7 to 9 can be further seen, takes between the two, preferably triangular surfaces 40, 41 to be measured thickness 42 of the thread eye region 9 away to the shaft 24 towards. The thickness exceeds 42, as the section DD in FIG. 9 shows, at least in a part of the guide surface portion 22, the thickness 43 of the shaft 24 of the main body of the heald 7 (FIG. FIG. 10 ).

As can be seen in particular FIG. 9 can be seen, the heald 7 at least on the Leitflächenabschnitt 22 at least in places no mutually complementary side surface shapes by the aforementioned measure. The width B1 of the guide surface 35 is in FIG. 9 significantly larger than the existing on the opposite side width B2 of the recess. Preferably, B2 is constant along the baffle portion 22. Neighboring similar healds therefore can not fit together properly. The sliding surface portion 22 thus forms a means for maintaining a minimum distance between the healds. In the case of water weaving machines, it is thus prevented that adjacent healds stick together due to the effect of the adhesion forces of the water present on the healds.

The healds 7 described so far are moved up and down during operation. As it turned out FIG. 1 in connection with FIG. 2 can be seen running the warp 3b during the up and down movement of the heald frames 1 and 2 along the side of the heald 7 along. It passes from the shaft 24 via the guide surfaces 35 on the sliding surface 14 and below the thread eye 10 again on the guide surface 35 'on the side surface of the shaft 24. Because all the surfaces are oriented in Kettfadenlängsrichtung 11, strikes the warp 3b at any point an edge. He will be spared. Also, the strand is spared. Even if edges should form at the edges of the guide surfaces 35, 35 ', 36 and / or the webs 12, 13 and / or the sliding surfaces 14, 15 with time, they can damage the warp 3b as little as the warp thread 3a.

The heddle 7 is particularly suitable for water weaving. It is expedient here if, in addition to or as an alternative to the above-discussed structures of the guide surface sections 21, 22, further spacer means are provided on the heddle 7.

Such a spacer means is for example in FIG. 11 illustrated by two adjacent healds 7, 7 '. As can be seen, the end eyes 8, 8 'are thicker than the respective shafts 23, 23', whereby the shafts 23, 23 'are kept at a distance.

It is also possible, how FIG. 12 shows, on a heald at a suitable location, for example, to provide their end eyelet 8 a projection, for example in the form of a knot 44. Such a nub may be formed, for example, on a flat side of a heald. It is also possible for a plurality of such nubs, for example, to be distributed over the side surface of the end eyelet 8.

It has also been found to be advantageous to provide the heald in the region of its line-up opening 45 with a projection serving as a spacer. FIG. 13 illustrates two adjacent healds 7, 7 ', the Aufreihöffnungen 45, 45' are each surrounded by a tubular or annular projection 46, 46 '.

Such a pipe or annular projection 46 may, as FIG. 14 shows, be arranged on each heald 7, 7 'also on both flat sides of the heald.

Regardless of the specific configuration of the spacer means, it is, as will be apparent from the above, useful if a direct bonding adjacent healds is prevented both in the region of its thread eye 10 as well as in the region of their end eyelets 8 by suitable spacer means.

A heddle 7 according to the invention has a thread eye region 9 whose thread eye 10 is delimited by two webs 12, 13 which are parallel to one another. The transition from the thread eye region 9 to the shafts 23, 24 is provided by a Leitflächenabschnitt 21, 22, which has a Z-shaped cross-section. The two mutually parallel legs 32, 33 of the Z-shaped cross section carry guide surfaces 35, 36, at which a warp 3b can strip along; without touching an edge of the heald 7.

reference numeral

1, 2

heald

3, 3a, 3b

warp

4, 5

warp sheets

6

shed

7

heald

8th

end loop

9

Thread eye area

10

thread eye

11

warp thread

12, 13

Stege

14, 15

sliding surface

14a, 15a

Inner surface of 14, 15

17, 18

lines

19, 20

wall sections

21, 22

Leitflächenabschnitt

23, 24

shafts

25

Thread eye width

26

thickness

27, 28

edge

29, 30

width

31a

Eye width, measured in the thread longitudinal direction

31b

Eye width, measured transverse to the thread length direction

32, 33

leg

34

connecting web

35, 36

baffle

37, 38

lines

39

center line

40, 41

surfaces

42, 43

thickness

44

Spacer, nubs

45

Aufreihöffnung

46, 46 '

annular projection

47, 48

flat side

Claims (15)

Plastic heald (7)
with a plastic strand body which: - A thread eye region (9) formed therein, of two mutually parallel webs (12, 13) limited thread eye (10), - Two on the thread eye region (9) at opposite ends (17, 18) arranged Leitflächenabschnitte (21, 22), each with two guide surfaces (35, 36) and - two shafts (23, 24) adjoining the guide surface sections (21, 22), wherein each cross section of the guide surface portion (21, 22) has two parallel legs (32, 33) carrying the guide surfaces (35, 35 '36) and a connecting web (34) connecting said legs (32, 33) with both legs (32, 33) each includes an angle (α). Plastic heald according to claim 1, characterized in that the guide surfaces (35, 35 '36) and the large flat sides (47, 48) of the shafts (23, 24) are each oriented parallel to a yarn running direction (11). Plastic heald according to claim 1, characterized in that the webs (12, 13) and the legs (32, 33) have a thickness (26) which matches each other. Plastic heald according to claim 1, characterized in that the legs (32, 33) and the shafts (23, 24) have a thickness (26) which coincides with each other. Plastic heald according to claim 1, characterized in that the connecting web (34) at at least one point has a thickness (41) which differs from the thickness (43) of the two legs (32, 33). A plastic heald according to claim 1, characterized in that the two baffles (35, 36) of each baffle section (21, 22) each extend from a first end of the baffles (35, 36) from the shaft (23, 24) to a second end lead the guide surfaces (35, 36) to the two webs (12, 13). Plastic heald according to claim 1, characterized in that the guide surface (35, 36) at its the shaft (23, 24) facing the first end has a greater width than at its the web (12, 13) - facing the second end. Plastic heald according to claim 1, characterized in that the width of the guide surface (35, 36) on the web (12, 13) is less than half the shaft width, while the width of the guide surface (35, 36) on the shaft (23 , 24) is greater than half the shaft width. Plastic heddle according to claim 1, characterized in that the width of the guide surface (35, 36) at its first end of the width of the web (12, 13) and at its second end corresponds to the width of the shaft (23, 24). Plastic heddle according to claim 1, characterized in that the connecting web (34) has at least one surface (40, 41) with a triangular outline. Plastic heald according to claim 1, characterized in that the connecting web (34) to the shaft (23, 24) towards an increasing thickness. Plastic heald according to claim 1, characterized in that the thread eye region (9) has mutually complementary, mating contours. Plastic heald according to claim 1, characterized in that the shafts (23, 24) have at their ends remote from the thread eye (10) end eyelets (8). Plastic heddle according to claim 10, characterized in that spacer means (44) are provided on the end eyes (8). Plastic heald according to claim 1, characterized in that the spacer means (44) is formed by at least one projection provided on at least one side of the heald (7).

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