EP2843092B1 - Warp stop motion with a guide rail - Google Patents

Description

The invention relates to a warp stop motion with a guide rail.

Warp stop guards are used in weaving machines. They monitor fractures of the warp threads during operation of the weaving machine. The warp stop motion can indicate a warp break and / or stop the loom. This has the advantage that weaving errors in the fabric produced can be avoided.

The warp stop motion detector has contact rails arranged transversely to the direction of extension of the warp threads. The contact rails have two electrical contacts isolated from each other. At the contact rails contact blades are arranged, which usually surround the contact rails. Each lamella is carried by a warp thread and falls down on a breakage of the warp thread on the contact rail. It connects the two electrical contacts of the contact rail, which can be detected by a suitable electrical evaluation. Thus, the warp breakage is detected immediately.

Parallel to the contact rails, the warp stop motion detector has several guide rails. The guide rails keep in the warp direction adjacent slats at a distance. In addition, they serve to support the warp threads and lamellae in a tension-free chain in order to avoid knotting or entanglement of the warp threads.

The contact rails and / or the guide rails are Usually supported by one or more spacer elements with recesses in which the contact rails or the guide rails are arranged. These spacers are usually made of plastic.

The replacement of the chain of a loom is complicated. If a warp stop motion is available, each warp thread must be guided through a lamella. It may be necessary to remove the guide rails of Kettfadenwächters and re-insert after arranging the new chain in the loom. The guide rails have a length of up to several meters, depending on the design of the weaving machine.

A warp stop motion is off, for example EP 0 539 061 A1 known. The warp stop motion has adjacent to a contact rail two mutually parallel guide rails, which are formed as by hollow cylindrical tubes with a circular cross-sectional contour. Between these two guide rails belonging to the contact rail slats are arranged.

Such a warp stopper is also in DE 1 216 209 A described.

It can be considered an object of the present invention to increase the service life of the warp stop motion and to facilitate the replacement of a chain and in particular the handling of the guide rails.

This object is achieved by a warp stop motion with a guide rail according to the features of patent claims 1.

The guide rail of Kettfadenwächters extends in its longitudinal direction. The longitudinal direction of the guide rail is oriented at right angles to the warp direction when used in the loom. In cross-section, the guide rail in particular has the same cross-sectional profile throughout. The width of the guide rail in a width direction is preferably smaller than the height of the guide rail in the height direction. The width direction and the height direction are oriented at right angles to each other and at right angles to the longitudinal direction. In the position of use in the weaving machine, the width direction extends in the warp direction.

The guide rail is designed as a hollow profile body. A wall of the guide rail defines at least one cavity. The cavity extends in the longitudinal direction completely through the entire guide rail. Preferably, the wall thickness of the hollow profile body is constant.

By carrying out the guide rail as a hollow profile body reduces its weight considerably. During operation of the weaving machine, vibrations and vibrations occur. An at least slight movement of the guide rails relative to the guide rails supporting or supporting parts of the Kettfadenwächters can not be excluded and may cause damage during operation of the loom. Due to the reduced weight, the load on the guide rail bearing parts of the warp stop motion, such as spacers made of plastic, reduces and increases the service life of the warp stop motion.

Handling when changing the chain for an operator is simplified. In addition, can be reduced by the inventive design of the guide rail, the cost of materials and therefore the cost of producing the guide rail.

The at least one cavity is open at one point and in particular at exactly one point through a longitudinal gap to the environment. The cavity is therefore open at the longitudinal gap along the entire extension of the guide rail in the longitudinal direction.

In a particularly preferred embodiment, the wall of the guide rail is formed by a non-cutting process and in particular by roll forming. The guide rail can therefore be made in particular of a metal sheet. After bending or roll forming no further operation is necessary. Since chips do not form, there is no danger that chips will press into or adhere to the material and cause damage to the warp threads in the weaving machine.

The hollow profile body can provide a certain damping effect in the height direction when vibrations or vibrations occur. It can be deformed somewhat elastically in the height direction. This is the case, in particular, when the hollow profile body is formed by a wall made as a molded part or bent part from a uniform material without a seam or joint. The burden of the guide rails supporting or supporting parts of the warp stop motion can be further reduced.

In particular, the wall has two parallel longitudinal edges extending in the longitudinal direction. Preferably the distance from one or both longitudinal edges to the longitudinal center plane is less than half the width of the guide rail. The longitudinal edges can be arranged in this way within an outer profile or clearance of the cross-sectional contour.

In one embodiment, the longitudinal gap of a cavity may be bounded by a longitudinal edge and an adjacent wall portion or by both longitudinal edges of the formed sheet. Even when vibrations and vibrations occur, the longitudinal gap serves to avoid wear contact between the longitudinal edge of the wall and a wall section.

The wall of the guide rail is preferably made of a uniform material without seam and / or joint. For example, a sheet metal part with a particular constant sheet thickness can be used for the production of the guide rail. The sheet is preferably made of a non-rusting alloy, in particular steel alloy.

As explained, the guide rail or the guide body can be produced by forming from a metal sheet. In particular, the sheet has a constant sheet thickness. Preferably, the sheet thickness is at most one third of the width of the guide rail in the width direction.

At least at a height-facing side, the wall has a wall portion with at least one curvature. The curvature may have a constant or varying radius of curvature. The minimum radius of curvature corresponds at least to the sheet thickness from which the wall is made or the wall thickness. Especially on the side in the installation position The guide rail is associated with the warp threads can thus sharp edges and angles are avoided. On at least one side of the guide rail pointing in the vertical direction, only curved and / or flat wall sections are present.

Under a flat wall portion, a wall portion is formed, which extends along a plane.

In a preferred embodiment, the wall of the guide rail, from which the hollow profile body is formed, has a wall section inclined relative to a first longitudinal center plane. This inclined wall section can enforce the first longitudinal center plane in one embodiment. The first longitudinal center plane through the guide rail extends parallel to a plane which is spanned by the height direction and the longitudinal direction. Preferably, a wall section inclined relative to the first longitudinal center plane may terminate at one of the two longitudinal edges.

In a preferred embodiment, the guide rail is designed asymmetrically to its first longitudinal center plane. Alternatively or additionally, the guide rail may be formed symmetrically with respect to a second longitudinal center plane. The second longitudinal center plane is oriented parallel to a plane which is spanned by the width direction and the longitudinal direction.

On its two widthwise oriented, opposite sides, the guide rail has either a closed contact surface or at least one longitudinally extending curved contact edge on. In particular, an outer contour plane is respectively defined by the contact surface or the at least one contact edge. The two outer contour planes are arranged in particular parallel to one another. The distance between the two outer contour levels corresponds to the width of the guide rail in the width direction. A contact of an adjacent lamella with the guide rail takes place in the respective outer contour plane. A lamella can thus rest on the contact surface or on the at least one contact edge.

In a further advantageous embodiment, the guide rail has at least two cavities arranged one above the other in the vertical direction.

• Figur 1 eine schematische, blockschaltbildähnliche Darstellung einer Webmaschine in Seitenansicht,
• Figur 2 eine schematische, blockschaltbildähnliche Darstellung eines Kettfadenwächters der Webmaschine nach Figur 1 in Draufsicht,
• Figur 3 eine perspektivische Teildarstellung der Kontaktschienen des Kettfadenwächters nach Figur 2 mit beispielhaft veranschaulichten Kontaktlamellen,
• Figur 4 eine schematische Darstellung einer Kontaktschiene gemäß Figuren 2 und 3 in Querschnitt,
• Figur 5 eine schematische Seitenansicht des Kettfadenwächters mit Kontaktschienen und Führungsschienen,
• Figuren 6 bis 14 jeweils ein Querschnittsprofil eines Ausführungsbeispiels einer Führungsschiene für den Kettfadenwächter.

Advantageous embodiments and features of the invention will become apparent from the dependent claims, the description and the drawings. Hereinafter, preferred embodiments of the invention will be explained in detail with reference to the accompanying drawings. Show it:

• FIG. 1 a schematic, block diagram similar representation of a loom in side view,
• FIG. 2 a schematic, block diagram similar representation of a warp stop motion of the loom according to FIG. 1 in plan view,
• FIG. 3 a partial perspective view of the contact rails of Kettfadenwächters after FIG. 2 with exemplified contact blades,
• FIG. 4 a schematic representation of a contact rail according to Figures 2 and 3 in cross section,
• FIG. 5 a schematic side view of the warp stop motion with contact rails and guide rails,
• FIGS. 6 to 14 each a cross-sectional profile of an embodiment of a guide rail for the warp stop motion.

In FIG. 1 schematically the basic structure of a loom 20 is shown. Warp yarns 22 in a warp thread plane E are fed parallel to one another in a warp direction K via a coating beam 21. The warp threads 22 pass through a warp stop motion detector 23 and subsequently through one or more slats 24. Following the slats 24, the warp threads 22 are each guided through a heddle, wherein the healds are arranged in heddles 25. The healds 25 move in a working direction A, which usually coincides with the vertical direction. This allows sheds to be opened and closed. The number of healds 25 varies depending on the type of weave of the fabric to be fabricated. In FIG. 1 are merely schematic exemplified two healds 25 shown. In an open shed, a weft thread 26 can be registered and struck by means of a reed 27 on the fabric edge 28. The produced fabric 29 is pulled off via a fabric take-off 30.

The warp stopper 23 is in the Figures 2 and 5 illustrated schematically. The warp stopper 23 has a fastening device 34, by means of which it is attached to a machine frame 35 of the loom 20. The fastening device 34 has two fastening elements 36 extending in a width direction B, which are connected to the machine frame 35. Between the two fasteners 36 extend at a distance from each other two thread support tubes 37. The fasteners 36 and the thread support tubes 37 thereby form a mounting frame. The thread carrying tubes 37 extend in a longitudinal direction L which is oriented at right angles to the width direction B.

The longitudinal direction L extends in the installed position of the warp stop motion 23 parallel to the warp thread plane E. The width direction B may also be oriented parallel to the warp thread plane E or include with this an angle of inclination of at most 10 ° C to 15 ° C.

At the fastening device 34 contact rails 40 are arranged. The contact rails 40 extend parallel to each other in the longitudinal direction L. The contact rails 40 are seen in the working direction A of the loom 20 arranged above the warp thread plane E and overlap the warp threads 22nd

A schematic cross section through the contact rail 40 is shown in FIG FIG. 4 illustrated. The contact rail 40 has a first electrical contact part 41 and a second electrical contact part 42. The two contact parts 41, 42 are electrically isolated from each other by an insulating body 43. According to the example, the first contact part 41 has a rectangular cross-section and extends in the longitudinal direction L along the contact rail 40. The second contact part 42 is executed in the embodiment in cross-section U-shaped. The first contact part 41 and the insulation body 43 are arranged in the inner region of the second contact part 42. Each contact part 41 is electrically connected to an associated electrical connection 44 or 45 electrical connection 44 and 45, respectively.

Each warp 22 is associated with a contact blade 48. The contact blade 48 is made of electrically conductive material. Through a Kettfadenloch 49 in each contact blade 48 a warp thread 22 is passed in each case. If the warp thread 22 is sufficiently tensioned, the contact blade 48 is carried by the warp thread 22, as shown in the schematic diagram in FIG FIG. 3 can be seen. Each contact blade 48 also has in a height direction H, the Preferably, the working direction A of the loom 20 and, according to the example also corresponds to the vertical direction, a slat slot 50 on. An associated contact rail 40 passes through this slat slot 50. A contact leg 51 of the contact blade 48 engages over the contact rail 40 and the two accessible contact parts 41, 42. As long as the contact blade 48 is carried by the associated warp thread 22, the contact leg 51 is at a distance from the two contact parts 41, 42 arranged ( FIG. 3 ). As soon as the warp tension 22 is no longer sufficient, for example when a warp thread 22 breaks, the contact lamella 48 falls down in the height direction H until the contact limb 51 abuts the two upper end of the contact parts 41, 42 accessible in the height direction H and the two contact parts 41, 42 connects electrically with each other. This electrical connection can be detected at the electrical terminals 44, 45. In this way, the warp stopper 23 can detect a Kettfadenbruch so that automatically or manually by an operator, the necessary measures can be taken.

In FIG. 2 only a portion of the warp threads 22 and the contact blades 48 is illustrated in a highly schematic manner. Each warp 22 is associated with exactly one contact blade 48. The contact blades 48 of immediately adjacent warp threads 22 are assigned to different contact rails 40.

Parallel to the contact rails 40 extend through the fastening means 34 in the longitudinal direction L a plurality of guide rails 55. The guide rails 55 are seen in the width direction B each between two contact rails 40 are arranged. Seen in the height direction H, the guide rails 55 are spaced apart from the contact rails 40. In the area between the contact rails 40 and the guide rails 55 is in clearance for passing through the warp threads 22 ( FIG. 5 ). In installation position of Kettfadenwächters 23, the guide rails 55 are therefore below the warp thread level E.

The two longitudinal ends of each guide rail 55 are supported by the fasteners 36 of the fastener 34. Since the length of the guide rails 55 between the two fastening elements 36 depending on the loom can be one or more meters, the warp stop motion detector 23 has one or more support means 56, for example.

In FIG. 5 the warp stop motion 23 is shown schematically in the region of the support means 56 with a view in the longitudinal direction L. With a respective clamping unit 57, the support unit 56 is fastened by clamping on the two thread carrying tubes 37. An intermediate support 58, which extends in the width direction B, connect the two clamping units 57. The intermediate support 58 carries a first spacer element 59 and a second spacer element 60. Each spacer element 59, 60 has recesses or slots 61 which are open according to the example in the height direction H above , The spacer elements 59, 60 may be non-positively and / or positively arranged and held on the intermediate support 58 and the support means 56. Through each slot 61 of the first spacer element 59 extends a contact rail 40. The spacing of the slots 61 in the width direction B thus provides the distance between adjacent contact rails 40 and supports them against vibrations. The slots 61 in the second spacer element 60 determine the spacing in the width direction B between two adjacent guide rails 55. Each slot 61 of the second spacer element 60 is penetrated by a guide rail 55. The cross-sectional contour of the slots 61 of the first spacer element 59 is to the cross-sectional shape the contact rails 40 adapted. The cross-sectional shape of the slots 61 of the second spacer element 60 is adapted analogously thereto to the cross-sectional contour of the guide rails 55. The slots 61 of the two spacer elements 59, 60 have preferably considered a rectangular cross-section in the longitudinal direction L.

So far, the guide rails 55 were made of solid rods. In contrast, it is inventively provided the guide rails 55 designed as a hollow profile body 65. In the exemplary embodiment, the hollow profile body 65 consists of a wall with a preferably constant wall thickness WD. The wall consists of a uniform material without seam and joint. Preferably, the wall is made by a chipless forming process of a plate-shaped sheet metal part, in particular by roll forming. By way of example, the wall is made of a non-rusting metal alloy. The wall thickness WD corresponds at least in sections to the sheet thickness BD of the sheet metal part from which the wall was produced by forming. In the area of bends and curvatures of the wall, the wall thickness WD may deviate from the original sheet thickness BD by a material flow during bending. However, at least in the planar wall sections, the wall thickness WD corresponds to the sheet thickness BD of the original sheet metal part. The sheet thickness BD and the wall thickness WD are exemplified only in FIG FIG. 6 entered. The relationship described applies to all other embodiments according to the FIGS. 7 to 14 corresponding.

The hollow profile body 65 thus represents by way of example a molded part with a single wall. The wall has at least one wall section 67 curved with a radius of curvature R and at least one flat wall section 68. Under a flat wall portion 68 is a To understand wall portion which extends parallel to a plane. The radius of curvature R of a curved wall portion 67 has a minimum amount corresponding to the sheet thickness BD of the sheet metal part from which the wall or the hollow profile body 65 is made. The sheet thickness BD or the wall thickness WD of a flat surface portion 68 is 0.4 mm in the preferred embodiment.

By way of example, a curved surface section 68 has a constant radius of curvature R and, viewed in cross-section, extends along a circular arc section, for example along a quadrant or along a semicircle.

The hollow profile body 65 delimits at least one cavity 69 which extends completely through the hollow profile body 65 or the guide rail 55 in the longitudinal direction L. The cavity 69 is bounded by at least three wall sections 67, 68. At one point, the cavity is open by a longitudinal gap 70 to the outside to the environment. The longitudinal gap 70 has transversely to the longitudinal direction of a gap opening which is at most as large as the width FB of the guide rail 55 and the hollow profile body 65. The width FB of the guide rail 55 in the width direction B is determined by the minimum distance between two parallel outer contour planes AK, the are aligned at right angles to the width direction and the guide rail 55 from opposite sides touch, but do not intersect. Similarly, the height FH of the guide rail 65 is determined by the minimum distance between two parallel planes, which are aligned at right angles to the height direction H and touch the guide rail 55 but do not intersect. The height FH of the guide rail 55 is greater than the width FB. By way of example, the height FH is at least three to five times larger than the width FB of the guide rail 55. In the embodiment, the height FH may be 10 mm to 20 mm, and preferably 15 mm to 18 mm. The width FB of the guide rail 55 may be 2mm to 5mm and preferably 2mm to 3mm. This information is based on a tolerance in the range of preferably 0.1 mm to 0.2 mm. The width FB of the guide rail 55 is at least three times as large as the sheet thickness BD of the sheet metal part from which the hollow profile body 65 is formed.

The hollow profiled body 65 has two parallel longitudinal edges 71. All available longitudinal gaps 70 are limited in some embodiments at least by a longitudinal edge 71 extending in the longitudinal direction L of the hollow profile body 65. In the embodiments according to the FIGS. 6, 7 and 13 the longitudinal gap 70 is arranged between the two longitudinal edges 71. In other embodiments ( FIGS. 8 . 9, 10, 11 . 12 and 14 ), the longitudinal gap 70 is limited only by one of the two longitudinal edges 71 and an adjacent wall portion. The embodiment according to FIG. 12 also has a longitudinal gap 70, which is not limited by one of the two longitudinal edges 71.

In some embodiments, a plurality of cavities 69 are arranged one above the other in the height direction H ( FIGS. 9, 10, 12 and 14 ). The two cavities 69 are each open by a longitudinal gap 70 to the environment.

The planar surface portions 68 may be inclined or inclined at an inclination angle to the outer contour planes AK or a first longitudinal center plane M1 through the guide rail 55. The first longitudinal center plane M1 is perpendicular to the width direction B and therefore in the embodiment parallel to the outer contour plane AK arranged.

Preferably, the profile contours of the guide rail are designed asymmetrically with respect to the first longitudinal center plane M1. Only in the embodiments according to the FIGS. 7 and 13 the guide rail 55 has a symmetrical with respect to the first longitudinal center plane M1 shape.

The upper side 72 of the guide rail 55 assigned in the height direction H of the warp thread plane E or the warp threads 22 is designed without sharp edges and angles. In the preferred embodiments described herein, the top 72 is formed by a curved wall portion 67. The radius of curvature R of a curved wall portion 67 may be constant. It is also possible that certainly changes radius of curvature in the direction of curvature.

As a modification to the illustrated embodiment, one or more of the curved wall portions 67 may also be replaced by two or more curved wall portions, respectively, which are interconnected by an intermediate flat surface portion 68 therebetween. Schematically, such a modification is in FIG. 6 exemplified for the top 72. Instead of the curved wall section 67 present there, a planar surface section 68 could also be present, to which two curved surface sections 67 with a smaller radius of curvature join. Although this modification is only related to FIG. 6 is illustrated for a curved surface portion, this modification can be provided for all illustrated curved surface portions 62.

The guide rail 55 and the hollow profile body 65th have in each outer contour plane AK either a flat surface portion 68, which forms a contact surface 75 for the adjacent contact blades. As an alternative to such a contact surface 75, at least one contact edge 76 may be formed in an outer contour plane AK. The abutment edge 76 may be formed by a curved surface portion 67 or by a transition point between a flat surface portion 68 and a curved surface portion 67. If there are several abutment edges 67 on a side of the guide rail 55 pointing in the width direction B, they define the outer contour plane AK.

A second longitudinal center plane M2, which is spanned by the longitudinal direction L and the width direction B and is oriented at right angles to the first longitudinal center plane M1, can serve as a plane of symmetry for the guide rail 55 or the hollow profile body 65. The hollow profile body 65 according to the FIGS. 6 . 10 . 12 and 14 are designed symmetrically to this second longitudinal center plane M2.

The first embodiment of the hollow profile body 65 according to FIG. 6 has a flat surface portion 68 to form a contact surface 65. At the top 72 and one of the top 72 opposite bottom 77 each have a curved surface portion 67 is present. Each of the two curved surface sections 67 is adjoined by a planar surface section 68, which ends at one of the two longitudinal edges 71. The surface sections 68 having the longitudinal edges 71 are inclined inwardly with respect to the first longitudinal center plane M1 at an angle of inclination of, for example, 1 °, so that the longitudinal edges 71 are arranged between the two outer contour planes AK. The flat surface portions 68 having the longitudinal edges 71 approach, starting from the adjacent curved surface portion 67 in their extension to the respective longitudinal edge 71 towards the opposite, spaced by the cavity 69 flat surface portion 68 at.

The embodiment of the hollow profile body 65 according to FIG. 6 is slightly elastic in height direction H The two surface portions which are subject to the gap 70 may approach each other somewhat depending on the gap distance. When occurring vibrations and vibrations during operation of the loom 20 thus a certain damping effect can be achieved.

The hollow profile body 65 is significantly lighter compared to a Vollprofikörper. By suitable shaping a sufficient bending stiffness can be achieved, so that the guide rail 55 does not sag transversely to the longitudinal direction L by its own weight and the vibrations and vibrations of the loom. In particular, the bending stiffness of all embodiments of the hollow profile body 65 in the height direction H is greater than in the width direction B.

The handling when replacing the chain, if the guide rails 55 must also be removed from the warp stop 23 and rebuilt, is considerably simplified because of the lower weight. The hollow profile body 65, which is made by forming from a flat sheet metal part without cutting, can be produced inexpensively and efficiently. The risk of adhering shavings that could damage a warp thread 22 does not exist.

At least at the upper side 72, the warp threads 22 can come into contact with the guide rails 55, which is shown schematically by way of example in FIG FIG. 5 is illustrated. If the warp tension is too small, for example, when threading a new warp, the warp threads may be on the rounded, edgeless tops 72 of the guide rails 55 fly up. The contact blades 48 are guided between the guide rails 55. A knotting or entanglement of the warp threads 22 or hooking of the contact blades 48 is thereby avoided.

In the second embodiment of the hollow profile body 65 according to FIG. 7 is the gap 70 between the two longitudinal edges 71 on the bottom 77 of the guide rail 55. The hollow profile body 65 has at the top 72 a curved wall portion 67, to each of which a flat wall portion 68 connects, each having a longitudinal edge 71. The two flat wall sections 68 each form a contact surface 65 which faces in opposite directions.

The embodiment according to FIG. 8 is compared to the embodiment according to FIG. 7 modified in that one of the two planar surface sections in the height direction H is shortened. The two longitudinal edges 71 are therefore arranged in the height direction H at a distance from each other. The cavity 69 is thereby reduced and the gap 70 is formed between the one longitudinal edge 71 and the opposite in the width direction B flat surface portion 68.

In the fourth embodiment of the hollow profile body 65 according to FIG. 9 two cavities 69 are present and arranged in the height direction at a distance from each other. Each cavity 69 is arranged symmetrically to the first and / or second longitudinal center plane M1, M2 and has a teardrop-shaped contour in cross-section. The two longitudinal gaps 70 face each other and extend along the first longitudinal center plane M1 in the longitudinal direction L. A central, planar surface section 68 passes through the first longitudinal center plane M1 inclined at an inclination angle, wherein it merges at the top 72 and at the bottom 77 in each case in a curved surface portion 67 having an identical contour. On the side opposite the central planar surface section 68, a planar surface section 68 adjoins in each case on both curved surface sections 67, which extends at an inclination angle inclined to the first longitudinal center plane M1 and ends at a respective longitudinal edge 71. Between the longitudinal edge 71 and the adjacent in the width direction B central flat surface portion 68, a longitudinal gap 70 is formed in each case. The entire cross-sectional contour of this hollow profile body 65 is similar to the shape of an "8".

According to the fifth embodiment FIG. 10 a flat surface portion 68 extends to form a contact surface 75 along an outer contour plane AK, wherein both in the region of the top 72, and in the region of the bottom 77 each followed by a curved surface portion 67, wherein these two curved surface portions 67 are configured identically. Along the respective other outer contour plane AK, a planar surface section 68 and another curved surface section 67 in the form of a quarter-circle arc, which terminates in the longitudinal edge 71, adjoin the two curved surface sections 77 in each case. Two longitudinal gaps 70 are thereby formed in each case between a longitudinal edge 71 and the opposite wall portion 68. The two longitudinal gaps are arranged at the same distance from the second longitudinal center plane M2.

In the embodiments of the hollow profile body 65 according to the FIGS. 6 to 10 all curved surface portions 67 of a respective hollow profile body 65 have the same radius of curvature R. In contrast, the embodiment according to FIG. 11 two curved surface portions 67 with magnitude different radii of curvature R on. On the upper side 72 there is a curved surface section 67 which extends between the two outer contour planes AK. On the one hand, this curved surface portion 67 merges to form a contact edge 76 in a relative to the first longitudinal center plane M1 inclined flat surface portion 68 which terminates at the first longitudinal edge 71. This longitudinal edge 71 is located between the first longitudinal center plane M1 and the associated outer contour plane AK. On the opposite side in the width direction B extends from the curved wall portion 67 of the top 72 in a flat wall portion 68 along the other outer contour plane AK to a further curved surface portion 67 with a smaller radius of curvature. This curved surface portion 67 describes a quarter circle and merges into a flat wall portion 68, which is perpendicular to the height direction H and passes through the first longitudinal center plane M1. At this flat surface portion 68, the other longitudinal edge 71 is present. Both longitudinal edges 71 are thus located between the first longitudinal center plane M1 and one of the two outer contour planes AK.

In FIG. 12 is a seventh embodiment of the hollow profile body 65 illustrated, compared to the embodiment according to FIG. 10 modified by a bend 78, a third cavity 69 is created. The bend 78 is provided in the flat wall portion 68 located between the top surface 72 and the bottom 77 forming curved surface portions 67. The bend 78 is arranged between the two longitudinal gaps 70 symmetrically to the second longitudinal center plane M2 and opened in the width direction B by a longitudinal gap 70. This cavity 69 thus has a Longitudinal gap 70, which is not limited by at least one longitudinal edge 71, in contrast to the longitudinal gaps 70 described so far. The bend 78 is formed by a plurality of and, for example, four curved surface sections 67 with different radii of curvature and a planar surface section 68. The bend 68 passes through the first longitudinal center plane M1.

In the eighth embodiment according to FIG. 13 of the hollow profile body 65 is on the upper side 72 a nearly closed to a full circle curved wall portion 67 which limits the cavity 69. This is followed by two mutually parallel planar wall sections 68, which each extend to the longitudinal edge 71. The two longitudinal edges 71 are arranged side by side on the bottom 77. Between the two flat surface portions 68, a gap 80 is present along the first longitudinal center plane M1, which opens out between the two longitudinal edges 71 in the longitudinal gap 70 to the environment.

This in FIG. 14 illustrated ninth embodiment is a modification of the embodiment according to FIG. 13 , Both at the top 72, and at the bottom 77 each have a curved wall portion 67 is present, which also has almost a completely circular course here. Between the first longitudinal center plane M1 and the one outer contour plane AK, the two curved surface sections 67 are connected to each other by a flat surface section 68. On the other side of the longitudinal center plane M1 is followed by each of the curved surface portions 67 each have a flat surface portion 68 which terminates at the longitudinal edge 71. The longitudinal edges 71 are arranged at a distance from the second longitudinal center plane M2. The flat surface portions 68 are parallel to each other. Each cavity 69 is connected by a gap 80 between each two planar surface portions 68 with a longitudinal gap 70.

In addition to the new embodiments for the hollow profile body 65 shown and described here, further modifications are possible. The described embodiments can also be combined with each other. For example, planar surface portions 68 which run parallel to the height direction H and to the longitudinal direction L can also be inclined relative to the height direction H or the first longitudinal center plane M1. The longitudinal edges 71, which adjoin an outer contour plane AK directly, can also be arranged within the cross-sectional profile between the two outer contour planes AK by connecting at least one further curved wall section 76 and / or planar wall section 68. As a result, contact of the longitudinal edge 71 with a contact blade 48 is avoided.

The guide rail 55 preferably has a width FB in a width direction B that is smaller than a height FH in a height direction H. The guide rail 55 is a hollow profile body 65 with at least one cavity 69 executed. The hollow profile body 65 is formed by a bent part. In particular, the hollow profile body 65 can be produced by non-cutting shaping, for example roll forming, of a plate-shaped sheet metal part and forms an integral wall of the hollow profile body 65. The wall delimits the cavity 69.

LIST OF REFERENCE NUMBERS

20

loom

21

back rest

22

warp

23

warp stop motions

24

lamella

25

heald

26

weft

27

Riet

28

selvedge

29

tissue

30

Fabric take

34

fastening device

35

machine frame

36

fastener

37

Thread supporting tube

40

contact bar

41

first contact part

42

second contact part

43

insulation body

44

electrical connection

45

electrical connection

46

47

48

Multilam

49

Kettfadenloch

50

flap slot

51

contact legs

55

guide rail

56

support means

57

terminal unit

58

intermediate support

59

first spacer element

60

second spacer element

61

slot

65

Hollow profile body

67

curved wall section

68

level wall section

69

cavity

70

longitudinal gap

71

longitudinal edge

72

top

75

contact surface

76

contact edge

77

bottom

78

bend

80

gap

A

working direction

AK

Outline level

B

width direction

BD

sheet thickness

e

warp thread

FB

Width of the guide rail

FH

Height of the guide rail

H

height direction

K

warp

L

longitudinal direction

M1

first longitudinal median plane

M2

second longitudinal median plane

WD

wall thickness

Claims (13)

1. Warp thread monitor (23) with a guide rail (55), wherein the guide rail (55) has a cross-section profile which has a width (FB) in a width direction (B) and a height (FH) in a height direction (H), wherein the guide rail (55) is configured as a hollow profile body (65) and has a wall delimiting at least one cavity (69) through which the guide rail (55) passes completely in a longitudinal direction (L), characterised in that the at least one cavity (69) is open to the environment at one point via a longitudinal slot (70).
2. Warp thread monitor according to claim 1, characterised in that the wall is made of a uniform material without a seam or joint.
3. Warp thread monitor according to one of the preceding claims, characterised in that the form of the wall is created by a non-cutting process.
4. Warp thread monitor according to any of the preceding claims, characterised in that the wall is made from a metal sheet of constant sheet thickness (BD).
5. Warp thread monitor according to claim 4, characterised in that the sheet thickness (BD) is maximum one-third of the width (BF) of the guide rail (55).
6. Warp thread monitor according to any of the preceding claims, characterised in that the wall has a curved wall portion (67) at least on a side pointing in the height direction (H).
7. Warp thread monitor according to claim 6 and claim 4 or 5, characterised in that the curved wall portion (67) has a minimum radius (R) of curvature which corresponds to the sheet thickness (BD).
8. Warp thread monitor according to any of the preceding claims, characterised in that the wall has a flat wall portion (68) which is arranged inclined relative to a first longitudinal centre plane (M1) passing through the guide rail (55) and extending in a height direction (H) and in the longitudinal direction (L).
9. Warp thread monitor according to any of the preceding claims, characterised in that the wall is asymmetric in relation to a first longitudinal centre plane (M1) passing through the guide rail (55) and extending in the height direction (H) and in the longitudinal direction (L).
10. Warp thread monitor according to any of the preceding claims, characterised in that a flat contact face (75) or at least one curved contact edge (76) each extending in the longitudinal direction (L) is present on opposite sides in the width direction (B).
11. Warp thread monitor according to claim 10, characterised in that the contact face (75) or the at least one contact edge (76) each defines an outer contour plane (AK).
12. Warp thread monitor according to claim 11, characterised in that the outer contour planes (AK) are arranged parallel to each other
13. Warp thread monitor according to any of the preceding claims, characterised in that at least two cavities (69) are arranged above each other in the height direction (H).

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