EP2584078B1 - Heald with yarn-friendly yarn eyelet - Google Patents

Description

The invention relates to a heddle for a weaving shank of a loom. Healds are equipped with a large number of strands, each strand has a thread eye through which a warp thread is passed in the position of use of the heald. The healds are moved up and down during operation of the loom to form a shed. In the shed, the weft is entered. The warp threads and healds are exposed to great loads. However, high accelerations or delays of the healds must not lead to excessive wear or damage to the warp thread and heald.

US 5,348,055 A describes a heald, which is made of a band-shaped metal part. The thread eye is formed by punching an opening in the metal strip. This results in two thread eye limiting and extending in the longitudinal direction of the heddle body webs. To carry out the warp, the webs are bent out of the plane of the metal strip and thus have a distance from each other transversely to the warp direction and transverse to the longitudinal direction. In such a strand edges are formed in the region of the thread eye, which can lead to heavy wear of the warp thread. Out DE 43 36 362 C2 goes out a similar heald.

EP 1 739 215 B1 describes a heddle made of plastic. The two the thread eye in the thread longitudinal direction delimiting the thread support surfaces are flat and can be rounded in the outer surfaces of the strand body. The distance between the two webs in warp direction and transverse thereto defines the size of the approximately rectangular contoured thread support surfaces. The heald is thereby relatively thick in the area of the thread eye.

Another plastic heald describes EP 2 224 046 B1 , The two thread eye in the longitudinal direction of the strand body limiting thread support surfaces are web-like thin and about as thick as the two thread eye limiting ridges. The contact surface for the warp thread is very small.

Another heddle made of plastic is made CN 2 723 472 Y known. Between the two thread eye limiting and extending in the longitudinal direction of the heddle body webs a curved extending thread support surface is provided.

Starting from this known state of the art, it can be regarded as an object of the present invention to provide a heald which reduces the wear of the warp thread.

This object is achieved by a heddle with the features of claim 1.

According to the invention, the heddle has a heddle body which extends in the longitudinal direction between the two end loops. In the strand body, a thread eye for receiving a warp thread is present. The warp thread passes through the thread eye in a warp direction. Under the Kettfadenrichtung the direction of extension of the warp thread in the thread eye is to be understood when looking in the longitudinal direction of the warp thread or the associated thread support surface. The warp thread is deflected by the heddle in the thread longitudinal direction. Viewed along the entire length of the warp thread, this runs essentially in a warp thread plane which is spanned by the longitudinal direction of the heddle body and the warp thread direction.

The thread eye is delimited by two longitudinally spaced apart thread support surfaces of the strand body. Each thread support surface extends between a first longitudinal side and a second longitudinal side of the heddle body. The two longitudinal sides are preferably designed to be stepless and / or edgeless at least following the thread eye. Each thread support surface has a first planar surface portion and a second planar surface portion. The two surface sections are steplessly and without edges connected to one another via a central curvature section. The two surface sections are thus connected to each other thread-saving by the curvature section. Due to the two surface sections, the inclination of the warp thread on the warp thread entry side or the warp thread exit side of the thread eye can be predetermined by a corresponding inclination of the respective surface section. In this way, the profile of the thread support surface seen in the warp direction can be adapted to the open shed position of the heald, when the warp thread rests on the respective thread support surface. In the open shed position, therefore, the bearing surface between warp and heald is large, which reduces the local load of the warp. Both the warp of the warp and the weaving of the heald are reduced.

Advantageously, the curvature of the central curvature section in the warp direction is constant. The contour of the curvature section thus follows in the warp direction a constant radius and forms, so to speak, a lateral surface portion of a circular cylinder. The curvature ensures that the load of the warp thread in the thread eye is not too large.

In the longitudinal direction of the heddle body, this has two webs for limiting the thread eye, which preferably have the same contour. In one embodiment, a planar thread guide surface is provided on each web on the side facing the thread support surface. In particular, each yarn guide surface is oriented such that its normal vector points in a transverse direction transverse to the warp direction and transversely to the longitudinal direction. The thread guide surface thus extends in a plane which is spanned by the warp direction and the longitudinal direction. The oriented in warp direction thread guide surfaces serve to thread-gentle guidance of the guided through the thread eye warp thread.

In a further preferred embodiment, the longitudinal distance between the two webs measured in the warp direction is at least five times greater than the transverse distance between the two webs in the transverse direction at right angles to the warp direction and measured at right angles to the longitudinal direction. The thread support surface located in the area between the webs provides the warp thread in its longitudinal extent a sufficiently large contact surface in order to further reduce local loads on the warp thread. The width of the heald on the thread eye can be a maximum of 20% greater than the sum of the thickness of the two webs in the transverse direction at right angles to the warp direction and measured at right angles to the longitudinal direction. As a result, the heald is relatively thin in the transverse direction, whereby the number of healds on the heald can be very large.

It is also advantageous if each thread support surface has a first transition section curved in the warp direction between the first longitudinal side of the strand body and the first surface section and / or a second transition section curved in the warp direction between the second longitudinal side of the strand body and the second surface section. As a result, an edgeless curved transition between the respective thread support surface and the two side surfaces of the heddle body is possible. The curvature of the two transition sections can be of different sizes. In a preferred embodiment, the curvature of the first and / or the second transition section is constant in the warp direction. In particular, the first and / or the second transition section pass continuously and without edges into the adjacent flat surface section of the thread support surface and into the adjacent longitudinal side.

The end of the first side surface adjacent to the first transition portion and / or the end of the second side surface adjacent to the second transition portion preferably includes an acute angle with the warp direction. The two ends of the first and second side surfaces extend in particular at the same distance parallel to each other obliquely to the warp direction. The adjoining the transition portion end of the respective side surface connects the two webs of the strand body.

In a preferred embodiment, the first side surface and / or the second side surface seen in the longitudinal direction at least in the area adjacent to the thread eye is rotated about an axis parallel to the longitudinal direction, so that the normal vector of the first side surface and / or the second side surface following the respective Thread support surface with the warp direction an acute Includes angle. The heald body is rotated in the region of its thread eye in this embodiment about an axis extending parallel to the longitudinal axis, whereby a passage region for the warp thread is formed between the two webs.

It is advantageous if the inclination of the first surface section in the warp direction is adapted to a warp thread entry angle and / or the inclination of the second surface section in the warp direction to a warp thread exit angle in the open position of the associated web. The warp thread entry angle is the angle at which the warp thread guided by the thread eye extends in relation to a reference plane extending at right angles to the longitudinal direction towards the heald. The warp thread emergence angle is the angle of the warp thread opposite the reference plane under which the warp thread runs from the heald to the selvedge. In this embodiment, the local load of the warp thread and thus also the local load of the thread support surface of the heald is very low, which minimizes wear. The warp thread entry angle and the warp thread exit angle are generally different in size.

Each web may have on its side opposite the yarn guide surface a flat outer surface, which is preferably aligned parallel to the yarn guide surface. The flat outer surfaces may therefore extend parallel to the warp direction, whereby warp threads guided between two adjacent healds of a heddle may slide along the outer surface.

The heddle body has at its two ends in the longitudinal direction in each case an end eye region, in each of which an end eye of the heddle for attachment a Litzentragschiene is arranged. At least outside these Endösenbereiche the two side surfaces of the Litzenkörpers are in a preferred embodiment infinitely and edged designed. This ensures that the heddles can glide along warp threads passing by without tangling with these warp threads.

The heddle is preferably made of plastic and / or a composite material based on plastic, in particular by a casting method, for example injection molding. The heald can be manufactured in one piece seamlessly and seamlessly from a uniform material. Preferably, the thread eye is bounded directly by the strand body. Thread eye inserts, such as a Maillon can be omitted.

• Figur 1 eine schematische Darstellung einer Weblitze in einer Seitenansicht in Querrichtung quer zur Kettfadenrichtung und zur Längsrichtung des Litzenkörpers gesehen,
• Figur 2 eine schematische Prinzipdarstellung des Kettfadenverlaufs durch zwei beispielhaft dargestellte Webschäfte in einer perspektivischen Ansicht,
• Figur 3 den Kettfadenverlauf gemäß Figur 2 in einer schematischen Seitenansicht,
• Figur 4 eine perspektivische Darstellung eines das Fadenauge aufweisenden Abschnitts eines Ausführungsbeispiels einer Weblitze,
• Figur 5 das Schnittbild der Weblitze aus Figur 4 gemäß der Schnittlinie V-V in Figur 4,
• Figur 6 das Fadenauge der Weblitze gemäß der Figuren 4 und 5 in vergrößerter Darstellung,
• Figur 7 eine schematische Prinzipdarstellung der Fadenauflagefläche der Weblitze mit Blick in Längsrichtung und
• Figur 8 eine geschnittene Teildarstellung durch den Litzenkörper im Bereich einer Fadenauflagefläche, wobei die Schnittebene in Kettfadenrichtung und in Längsrichtung ausgerichtet ist.

Advantageous embodiments of the heald according to the invention will become apparent from the dependent claims and the description. The description is limited to essential features of the invention and other conditions. The drawing is to be used as a supplement. The invention will be explained with reference to embodiments with reference to the drawings. Show it:

• FIG. 1 a schematic representation of a heald seen in a lateral view in the transverse direction transverse to the warp direction and the longitudinal direction of the strand body,
• FIG. 2 2 shows a schematic basic illustration of the warp thread course through two healds, shown by way of example, in a perspective view,
• FIG. 3 the warp thread according to FIG. 2 in a schematic side view,
• FIG. 4 3 is a perspective view of a thread eye portion of an embodiment of a heald,
• FIG. 5 the sectional view of the heald FIG. 4 according to the section line VV in FIG. 4 .
• FIG. 6 the thread eye of the heald according to FIGS. 4 and 5 in an enlarged view,
• FIG. 7 a schematic diagram of the thread support surface of the heald with a view in the longitudinal direction and
• FIG. 8 a sectional partial view through the heald body in the region of a thread support surface, wherein the cutting plane is aligned in the warp direction and in the longitudinal direction.

The invention relates to a heald 10, as schematized in FIG. 1 is illustrated. The heddle 10 is in the embodiment of a heddle body 11, which is made of plastic or a composite material based on plastic, for example by a casting method such as injection molding. The heddle body 11 extends in a longitudinal direction L and has at its two longitudinal ends in each case an end eye region 12 with an end eye 13. The end loops 13 are used to attach the heald 10 to a respective associated Litzentragschiene a heald 14. The heddle body 11 has a thread eye 15 approximately centrally between the two end loops 13. Through the thread eye 15 10 a warp thread 16 is passed in the use position of the heald. The warp thread 16 extends in the longitudinal direction L in a warp direction F through the thread eye 15 of the heald 10.

The healds 14 are moved to form a shed in a vertical direction, which corresponds in the position of use of the healds 10 of the longitudinal direction L of the heddle body 11. The guided through the thread eyes 15 of the heddles 10 warp threads 16 are thereby deflected out of a horizontal plane up or down. The warp threads 16 run starting from a coating tree 19 or starting from part bars to the respective associated heald 10 and enter the thread eye 15 of the heald 10 on the warp thread entry side 20. In the open shed position, the warp threads 16 run on the warp thread entry side 20 with respect to a horizontal plane at a warp thread entry angle α inclined towards the thread eye 15. On the warp thread entry side 21 opposite the warp thread entry side 21, the warp thread 16 exits the thread eye 15 with respect to a horizontal plane at a warp thread emergence angle β and runs to a fabric edge 22 out. Like this in FIG. 3 is shown schematically, the warp thread entry angle α and the Kettfadenaustrittswinkel β depending on whether the weaving shank 14 is in the upper shed or in the lower compartment, be different in size and assume, for example in the upper shed first values α1, β1 and in the lower shed second values α2, β2. In addition, the warp thread entry angle α and the warp thread emergence angle β also depend on the position of the heald between the fabric edge 22 and the coating beam 19, as indicated by the dashed heald 14 in FIG FIG. 3 is illustrated. In the embodiment described here, the warp thread entry angle α are smaller than the Kettfadenaustrittswinkel β, since the distance of the heald frames 14 to the coating tree 19 is greater than the distance between the heddle shafts 14 to the fabric edge 22nd

The stranded body 11 has at least outside its two end eyelet regions 12 a completely edgeless and stepless outer surface. This ensures that between two adjacent healds 10 passed through warp 16 of another heald 14 thread-saving on the heald 10 can slide along without hanging. The risk of excessive wear of the warp threads 16 or a thread breakage is thereby reduced. In the FIG. 4 lines drawn on the strand body 11 are merely illustrative of the contour of the strand body 11 and do not represent any edges.

For thread-saving recording of the warp thread 16, the thread eye 15 has a special shape. In the longitudinal direction L, the thread eye 15 is bounded by two opposing thread support surfaces 25. The heald 10 supporting heald 14 is located in the upper compartment or in the Lower part, is guided by the thread eye 15 warp 16 on one of the two thread support surfaces 25.

In a transverse direction Q at right angles to the warp direction F and at right angles to the longitudinal direction L, the thread eye 15 is bounded by two webs 26 arranged at a distance from one another. Each web 26 has on its the warp 16, which is performed by the thread eye 15, associated side a flat yarn guide surface 27. The thread guide surface 27 of a web 26 extends in a plane which is spanned by the warp direction F and the longitudinal direction L. The yarn guide surface 27 of a web 26 connects the two yarn support surfaces 25 of the heald body 11. This creates a yarn eye 15 circumscribed by the two yarn guide surfaces 25 and the two yarn guide surfaces 27 on the webs 26.

Each web 26 has on its thread guide surface 27 opposite from the thread eye 15 side facing away from a flat outer surface 28. The outer surface 28 is parallel to the yarn guide surface 27. The thickness d of a web 26 in the transverse direction Q is measured between the yarn guide surface 27 and the outer surface 28 and is for example between 0.4 and 0.5 millimeters. The outer surfaces 28 of the webs 26 are part of the outer surface of the heddle body 11 and not limited by steps or edges.

The two approximately in the warp direction F facing longitudinal edges 29 of each web 26 connect the yarn guide surface 27 and the outer surface 28. They are curved or curved, so that the yarn guide surface 27 and the outer surface 28 over the two longitudinal edges 29 of the web 26 stepless and edged together. The two in the warp direction F facing each other longitudinal edges 29 of two webs 26 of a strand body 11 in the embodiment have a constant radius, as in FIG. 5 can be seen. The longitudinal edges 29 of the two webs 26 oriented away from the thread eye 15 can have a plurality of radii and / or flattened sections.

Between the two a thread eye 15 delimiting webs 26, a longitudinal distance DL is present, which corresponds to the clear width between the two webs 26 in warp direction F. In the transverse direction Q, a transverse distance DQ is measured between the two webs 26 and according to example between the two flat yarn guide surfaces 27, which corresponds to the clear width between the two webs 26 in the transverse direction Q. The longitudinal distance DL is at least 5 times and in particular 5 to 7 times greater than the transverse distance DQ. The transverse distance DQ can be, for example, 0.15 to 0.2 mm. The longitudinal distance DL can be, for example, 1 mm to 1.5 mm. The width B of the heddle body 11 in the region of the thread eye 15 is described by the distance of the outer surfaces 28 of the webs 26 measured in the transverse direction Q. In the embodiment shown here, the width B can be 1.0 to 1.5 mm. The width B of the stranded body 11 at the thread eye 15 can be, for example, at most 10% greater than the sum of the thickness d of the two webs 26.

The thread support surface 25 is divided into several areas. The different areas are in the FIGS. 7 and 8 illustrated. Each thread support surface 25 extends between a first side surface 33 and a second side surface 34 of the heddle body 11. The two side surfaces 33, 34 are arranged on flat sides of the heddle body 11 remote from each other and merge stepwise and without edges at longitudinal edges 35 of the heddle body 11 above. The two side surfaces 33, 34 are always aligned parallel to each other. The normal vector NA of the first side surface 33 and the normal vector NA of the second side surface 34 follow a respective end eyelet region 12 in the transverse direction Q. Following the thread eye 15, the two side surfaces 33, 34 with respect to a longitudinal center plane M of the heddle body 13, the right angles to the transverse direction Q, rotated, so that the normal vector NA of the two side surfaces 33, 34, following the thread eye 15, is oblique to the transverse direction Q and oblique to the warp direction F. The normal vector NA includes with the transverse direction Q a rotation angle γ, which may be 15 to 20 degrees, for example. The two webs 26 are thus offset relative to the longitudinal center plane M of the heddle body 11 arranged on different sides, whereby the transverse distance DQ between the two webs 26 is formed.

Due to this alignment of the longitudinal sides 33, 34 of the heddle body 11 in the region of the thread eye 15, the end 33a of the first side surface 33 adjoining the thread support surface 25 or the end 34a of the second side surface 34 extending to the thread support surface 25 extends at the angle of rotation γ with respect to the warp direction F and thus obliquely to the warp direction F and also obliquely to the transverse direction Q.

The distance DS between the two side surfaces 33, 34 of the heddle body 11 adjacent to the thread eye 15 in the direction of the normal vectors NA of the two side surfaces 33, 34 is greater than the thickness d of a web 26. In the embodiment, this distance DS corresponds to the two side surfaces 33, 34 in approximately the diagonal dimension of a web 26. The distance DS between the two Side surfaces 33, 34 is smaller than the longitudinal distance DL between the two webs 26th

Between the end 33a of the first side surface 33 and the end 34a of the second side surface 34 extends the thread support surface 25. This has a first transition portion 40 adjacent to the first side surface 33 and a second transition portion 41 adjacent to the second side surface 34. The two transition sections 40, 41 are curved. In the warp direction F, the curvature of the transition sections 40, 41 is constant, for example. In FIG. 8 the heddle body 11 is cut in the region of the thread support surface 25 in a plane which runs parallel to the longitudinal center plane M of the heddle body 11. The sectional plane is thus spanned by the warp direction F and the longitudinal direction L. The sectional plane extends obliquely to the first side surface 33 and the second side surface 34 following the thread support surface 25. In this sectional plane, the two transition sections 40, 41 a curved, for example circular arc-shaped contour, wherein the circular arc of the first transition section 40 has a first radius r1 and the arc of the second transition portion 41 has a second radius r2. The two radii r1, r2 can be different sizes or the same size.

The described contour of the transition sections 40, 41 is limited to a thread guide area A of the thread eye 15. The thread guide region A is to be understood as the region of the thread eye 15 in which the warp thread 16 can move between the webs 26 in the transverse direction Q. The yarn guide area A is limited, for example, by the two planes which are defined by the two yarn guide surfaces 27 of the webs 26 ( FIG. 7 ). The form of the thread support surface 25 described above and below and its sections is limited in the preferred embodiment to the thread guide area A. Outside this thread guide region A, the thread support surface 25 has a planar and / or convex shape, which in particular is stepless and edgeless and which can deviate from the defined shape in the thread guide region A. Within and outside this thread guide area A concave depressions on the thread support surface 25 are avoided.

In a modified embodiment, the curvature of at least one of the two transition sections 40, 41 in the warp direction F can not be constant.

The thread support surface 25 also has a first planar surface portion 42 and a second planar surface portion 43. The two surface sections 42, 43 extend in different planes. The first surface section 42 extends inclined with respect to a perpendicular to the longitudinal direction L extending reference plane E by a first inclination angle δ1. The first inclination angle δ1 is constant in the warp direction F. The second surface portion 43 is inclined relative to the reference plane E by a second inclination angle δ2. The second inclination angle δ2 is constant in the warp direction F. The first inclination angle δ1 corresponds to the warp thread entry angle α and the second inclination angle δ2 corresponds to the warp thread exit angle β. If the heald 10 is located in a heald 14 in the open shed position, then the warp thread rests against the two surface sections 42, 43 and is not acted on in particular by the two transition regions 40, 41. In contrast to the curved surface of the transition regions 40, 41, the warp thread 16 extends tangentially in the direction of the relevant planar surface section 42 or 43, so that it surrounds the transition regions 40, 41. 41 overlaps only with the flat surface portions 42, 43 come into contact.

Between the two planar surface portions 42, 43, a central curvature portion 44 is present, which connects the two flat surface portions 42, 43 steplessly and without edges. In warp direction F, the curvature section 44 has a constant curvature in the exemplary embodiment. In the sectional view FIG. 8 Along the warp direction F, the contour of the curvature section 44 is thus formed by a circular arc with a third radius r3. The center of the circular arc of the curvature portion 44 is in the embodiment outside a median plane X between the first side surface 33 and the second side surface 34th

The contour of the thread support surface 25 is therefore asymmetrical with respect to the median plane X between the two side surfaces 33,34. In a modified embodiment, however, the contour can be configured symmetrically with respect to this center plane X.

The thread support surface 25 is designed to be a total of stepped and edged. Viewed in warp direction F, it has a constant slope or a constant curvature in sections, with tangential transitions being created in each case. The contour profile of the thread support surface is defined according to the invention defined in the warp direction F and thus obliquely to the normal vectors NA of the adjoining the thread support surface 25 side surfaces 33, 34 of the heddle body eleventh

The described curvature or inclination of the thread support surface 25 and its sections 40, 41, 42, 43, 44 is, as mentioned, provided at least in the thread guide region A and may deviate from the thread guide portion A thereof.

The invention relates to a heald 10 for a heald 14. The heald 10 has a heald body 11, which is preferably made of plastic by injection molding. A thread eye 15 of the heald 10 serves to pass a warp thread 16 in a warp direction F. As viewed in the longitudinal direction L of the heddle body 11, the thread eye 15 is bounded by two opposing thread support surfaces 25. The two thread support surfaces 25 are designed identically. Each thread support surface 25 has a first planar surface section 42 and a second planar surface section 43. Seen in the warp direction F, the inclination δ of the two surface sections 42, 43 is constant in each case and preferably of different sizes. The inclination δ is measured with respect to a reference plane E, which is horizontally oriented in the operating position of the heald 10. The two surface portions 42, 43 are continuously and without edges connected by an intermediate central curvature portion 44, which has viewed from the thread support surface 25 has a convex shape.

LIST OF REFERENCE NUMBERS

10

heald

11

heald

12

Endösenbereich

13

end loop

14

heald

15

thread eye

16

warp

19

back rest

20

Kettfadeneintrittsseite

21

Kettfadenaustrittsseite

22

selvedge

25

Thread bearing surface

26

web

27

Thread guide surface

28

outer surface

29

Longitudinal edge of the bridge

33

first side surface

33a

End of the first side surface

34

second side surface

34a

End of the second side surface

35

Longitudinal edge of the strand body

40

first transitional section

41

second transitional section

42

first area section

43

second surface section

44

curved section

α

Kettfadeneintrittswinkel

α1

first value of the warp thread entry angle

α2

second value of the warp thread entry angle

β

Kettfadenaustrittswinkel

β1

first value of Kettfadenaustrittswinkels

β2

second value of Kettfadenaustrittswinkels

γ

angle of rotation

δ1

first inclination angle

δ2

second inclination angle

B

Width of the strand body

d

Thickness of the bridge

DL

longitudinal distance

DQ

transverse distance

DS

Distance between the side surfaces

e

reference plane

F

warp

L

longitudinal direction

M

Longitudinal center plane

N / A

Normal vector of the side surfaces

NF

Normal vector of thread guide surfaces

r1

first radius

r2

second radius

r3

third radius

Q

transversely

X

midplane

Claims (15)

1. Heald (10) for a heald frame (14),
   with a heald body (11), which extends in a longitudinal direction (L) and which has a thread eyelet (15) that serves to receive a warp thread (16), which passes through the thread eyelet (15) in a warp thread direction (F),
   wherein the thread eyelet (15) is delimited by two thread supporting surfaces (25) spaced from one another in the longitudinal direction (L) on the heald body (11), and which extend respectively between a first longitudinal side (33) and a second longitudinal side (34) of the heald body (11),
   characterised in that each thread supporting surface (25) has a first plane surface section (42) and a second plane surface section (43), which are connected to one another without steps and without edges by means of a curvature section (44).
2. Heald (10) according to claim 1, characterised in that the curvature (1/r3) of the central curvature section (44) is constant in the warp thread direction (F).
3. Heald (10) according to claim 1 or 2, characterised in that the thread eyelet (15) is additionally delimited by two webs (26), which extend in the longitudinal direction (L) of the heald body (11) and which respectively have a plane thread guide surface (27).
4. Heald (10) according to claim 3, characterised in that the normal vector (NF) of the thread guide surface (27) is oriented in transverse direction (Q) transversely to warp thread direction (F) and transversely to the longitudinal direction (L).
5. Heald (10) according to claim 3 or 4, characterised in that the longitudinal spacing (DL) of the two webs (26) viewed in warp thread direction (F) is at least five times larger than the transverse spacing (DQ) of the two webs (26) measured in transverse direction (Q) at right angles to the warp thread direction (F) and to the longitudinal direction (L).
6. Heald (10) according to one of claims 2 to 5, characterised in that the width (B) of the heald (10) at the thread eyelet (15) is at maximum 20% larger than the sum of the thickness of the two webs (26) measured in transverse direction (Q) at right angles to the warp thread direction (F) and to the longitudinal direction (L).
7. Heald (10) according to one of the preceding claims, characterised in that each thread supporting surface (25) has a first transition section (40) curved in warp thread direction (F) between the first longitudinal side (33) and the first surface section (42) and/or a second transition section (41) curved in warp thread direction (F) between the second longitudinal side (34) and the second surface section (43).
8. Heald (10) according to claim 7, characterised in that an end (33a) of the first side face (33) adjoining the first transition section (40) and/or an end (34a) of the second side face (34) adjoining the second transition section (41) encloses an acute angle with the warp thread direction (F).
9. Heald (10) according to claim 7 or 8, characterised in that the curvature (1/r1) of the first transition section (40) and/or the curvature (1/r2) of the second transition section (41) in warp thread direction (F) is constant at least in a thread guide region (A), in which the warp thread (16) can move in transverse direction (Q) in the thread eyelet (15) between the webs (26).
10. Heald (10) according to one of the preceding claims, characterised in that the normal vector (NA) of the first side face (33) and/or the second side face (34) adjoining the respective thread supporting surface (25) encloses an acute angle with the warp thread direction (F).
11. Heald (10) according to one of the preceding claims, characterised in that the inclination (δ1) of the first surface section (42) is adapted to the warp thread entry angle (α) and/or the inclination (δ2) of the second surface section (43) is adapted to the warp thread exit angle (β) in the open shed position of the associated heald frame (14).
12. Heald (10) according to one of the preceding claims, characterised in that on its side opposite the thread guide surface (27) each web (26) has a plane outer surface (28), which is aligned parallel to the thread guide surface (27).
13. Heald (10) according to one of the preceding claims, characterised in that the first side face (33) and/or the second side face (34) is configured without steps and without edges at least outside the end eyelet regions (12).
14. Heald (10) according to one of the preceding claims, characterised in that the thread eyelet (15) is delimited directly by the heald body (11).
15. Heald (10) according to one of the preceding claims, characterised in that it is a plastic heald.

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