EP4495307A1

EP4495307A1 - Fastening unit for a relay nozzle

Info

Publication number: EP4495307A1
Application number: EP23186018.0A
Authority: EP
Inventors: Jozef Peeters; Chris Delanote
Original assignee: Picanol NV
Current assignee: Picanol NV
Priority date: 2023-07-18
Filing date: 2023-07-18
Publication date: 2025-01-22
Also published as: CN119332393A

Abstract

The invention relates to a fastening unit (4) for a relay nozzle (3) of an air-jet weaving machine with a sley profile (10) extending in a width direction (14), the fastening unit (4) comprising a first part (41) and a second part (42), wherein the first part (41) is adapted to be fastened to the sley profile (10) , wherein the second part (42) has a receiving structure (421) defining a first axis (105) and is adapted to receive the relay nozzle (3) such that a longitudinal axis (31) of the relay nozzle (3) is coaxially arranged to the first axis (105), and wherein the second part (42) is coupled to the first part (41) via a coupling structure (7) so as to be rotatable about a second axis (106), which second axis (106) is transverse to the first axis (105) and intersects the first axis (105).The invention further relates to a relay nozzle system comprising a fastening unit (4) and a relay nozzle (3).

Description

TECHNICAL FIELD AND PRIOR ART

The invention relates to a fastening unit for a relay nozzle of an air-jet weaving machine. The invention further relates to a relay nozzle system comprising a fastening unit and a relay nozzle.
As generally known, a relay nozzle is fastened to a sley of an air-jet weaving machine using a fastening unit. A fastening unit for a relay nozzle is shown for example in EP395132A1 . The fastening unit shown in EP395132A1 comprises a holder having a protruding tongue, wherein in use the tongue is inserted in a slot provided on a sley profile and clamped in the slot using a clamp. The relay nozzles are fixed to the holder.
In order to adjust a position of a blowing opening of the relay nozzle, a height position of the relay nozzle can be set with respect to the holder by moving the relay nozzle along its longitudinal axis with respect to the holder. Further, a so-called "horizontal" blowing direction can be set by rotating the nozzle about its longitudinal axis. In order to adjust a so-called "vertical" blowing direction, it is known to bend an upper portion of the relay nozzle provided with the blowing opening with respect to the longitudinal axis.

SUMMARY OF THE INVENTION

It is the object of the invention to provide a fastening unit for a relay nozzle of an air-jet weaving machine, which allows for an easy and repeatable adjustment of a blowing direction with high accuracy. It is a further object of the invention to provide a relay nozzle system comprising such a fastening unit and a relay nozzle.
These objects are solved by the fastening unit and the relay nozzle system with the features of claims 1 and 15. Preferred embodiments are defined in the dependent claims.
According to a first aspect, a fastening unit for a relay nozzle of an air-jet weaving machine with a sley profile extending in a width direction is provided, the fastening unit comprising a first part and a second part, wherein the first part is adapted to be fastened to the sley profile, wherein the second part has a receiving structure defining a first axis and is adapted to receive the relay nozzle such that a longitudinal axis of the relay nozzle is coaxially arranged to the first axis, and wherein the second part is coupled to the first part via a coupling structure so as to be rotatable about a second axis, which second axis is transverse to the first axis and intersects the first axis.
In use, the first part is fastened to the sley profile such that the second axis extends transverse, in particular perpendicular to the width direction of the sley profile.
In the context of the invention, "transverse" is used to describe at an angle, and perpendicular is used to describe at least almost perpendicular, meaning perpendicular with some tolerance. Similarly, "intersecting" is used to describe at least almost intersecting, meaning intersecting with some tolerance.
The longitudinal axis of a relay nozzle received in the second part is extending transverse, in particular perpendicular to the second axis. When rotating the second part with the relay nozzle about the second axis, an adjustment of a blowing direction of the relay nozzle in a direction transverse, in particular perpendicular to an initial orientation of the first axis of the relay nozzle, referred to as vertical blowing direction, is possible without the necessity of bending an upper portion of the relay nozzle. Hence, a relay nozzle can be manufactured from any suitable material without restrictions regarding particular material properties required for prior art relay nozzles, for which a vertical blowing direction is adjusted by bending the upper portion. Hence, for example ceramic materials or similar materials can be used for manufacturing the relay nozzles.
The second axis intersecting or at least almost intersecting the first axis has as advantage that when rotating the second part with the relay nozzle in relation to the first part over a limited range of +/- 5° about the second axis, a movement of a tip of the relay nozzle is negligibly small and has no or only a tolerable influence on a position of the tip of the relay nozzle along the first axis. Hence, any adjustment of a position of the tip of the relay nozzle along the first axis, if feasible, does not have to be repeated after rotating the second part with the relay nozzle over a limited range of +/- 5° in relation to the first part.
In an embodiment, the second axis intersects the first axis in the area of the receiving structure. In other words, a center of rotation for adjusting a vertical blowing direction is in the area of the receiving structure. In another embodiment, the second axis intersects the first axis in the area of the blowing opening or in an area between the receiving structure and the blowing opening.
In an embodiment, the coupling structure comprises three coupling pairs, each coupling pair comprising a slot and a pin, wherein the slot is adapted to receive the corresponding pin with play, in particular with tangential play, wherein one member of each pair is arranged on the first part, and the other member of each pair is arranged on the second part, such that in use each pair allows a rotation of the second part with respect to the first part about the second axis. In particular, in use one member of each pair is arranged along a circle about the second axis on the first part, and the other member of each pair is arranged along a corresponding circle about the second axis on the second part. All pairs may be arranged along a same circle or along different circles, as long as the center of rotation of each circle remains about the second axis.
In one embodiment, all slots are provided on one of the first part or the second part, and all pins are provided on the other one of the first part and the second part. In other embodiments, some slots and some pins are provided on one of the first part and the second part, whereas associated slots and pins are provided on the other part.
Providing exactly three coupling pairs allows a defined orientation of the second part with respect to the first part. However, in other embodiments, the coupling structure comprises more than three coupling pairs. In an embodiment, the slots merge seamlessly, allowing in theory a 360° revolution at least in the absence of a relay nozzle clamped between the first part and the second part. However, in other embodiments, the slots are dimensioned suitably to allow only for a small angular adjustment, in particular for an adjustment of less than +/- 5°, even in the absence of a relay nozzle clamped between the first part and the second part.
In embodiments, a curved slot cooperating with a curved rib is provided, or a curved slot cooperating with several pins is provided, so that the coupling structure is rotatable about the second axis.
In an embodiment, the coupling structure is further used for fixing the second part to the first part in a selected orientation about the second axis.
In other embodiments, additional fixation elements are provided. In particular, in an embodiment, the first part has a threaded hole and the second part has a corresponding elongated through hole for fixing the second part to the first part in a selected orientation about the second axis using a fixing bolt. When providing separate fixation elements, the pins of the coupling structure can be formed as integral elements of one of the first part and the second part, wherein the pins are inaccessible from an outside of the fastening unit.
In an embodiment, the receiving structure in the second part is a groove, in particular a circular arc groove or a V-shaped groove, wherein the groove is configured such that the relay nozzle received in the groove protrudes from the second part, and wherein the first part has a recess adapted for receiving the protruding part of the relay nozzle with play. In other words, the relay nozzle can be clamped between the first part and the second part, wherein the relay nozzle received in the recess of the first part is moveable together with the second part with respect to the first part over a limited range.
In an embodiment, the recess is adapted for receiving the relay nozzle with play such that the relay nozzle is rotatable about the second axis about +/- 5°.
In an embodiment, the recess has a flat base surface and side flanges that are slanted with respect to the flat base surface, wherein the received relay nozzle abuts the flat base surface. In use, the relay nozzle received between the first part and the second part abuts the flat base surface, wherein the flat surface allows a rotation of the relay nozzle about the second axis, and wherein the side flanges limit a movement of the relay nozzle with respect to the first part.
In an embodiment, the first part is adapted to be fastened to the sley profile in a settable position along the width direction of the sley profile. Hence, by setting the position of the first part with respect to the sley profile, a position of the relay nozzle along the width direction is adjustable.
In an embodiment, the first part has a sley side, wherein the sley side in use faces the sley profile, and wherein the second part is coupled to the first part at a side opposite of the sley side.
In other words, the sley side of the first part is defined as the side of the first part, which in use faces the sley profile. The first part is designed such that the second part and the sley profile are in use arranged at two opposite sides of the first part.
In an embodiment, at the sley side of the first part a protruding tongue is provided, which protruding tongue is adapted for fastening the first part to the sley profile having a slot using a slot nut. This allows for an adjustable fastening of the first part to the sley profile along the slot, wherein the slot preferably extends in the width direction of the sley profile.
In an embodiment, the first part has a first through hole allowing for an insertion of a threaded bolt for the slot nut, wherein the second part has a coinciding second through hole allowing for an access to the threaded bolt for the slot nut using a tool, for example an Allen key. The second through hole in embodiments is a slotted through hole allowing access to the threaded bolt in different angular orientations of the second part with respect to the first part about the second axis.
In an embodiment, the first part has a first contact surface at the sley side adapted for contacting the sley profile, wherein the first contact surface is inclined by a slanting angle with respect to a second contact surface of the first part perpendicular to the second axis, at which second contact surface the relay nozzle contacts the first part. In another embodiment, the receiving structure of the second part is a bore, adapted for receiving the relay nozzle, wherein the second part contacts the first part at a second contact surface. In other embodiments, the receiving structure of the second part is a groove, wherein a relay nozzle received in the groove protrudes from the groove and contacts the first part. For example, in embodiments, the second contact surface is the flat base surface of the recess provided in the first part, which in use is contacted by the received relay nozzle.
In an embodiment, the fastening unit is adapted to be fastened to the sley profile in a first orientation and a second orientation flipped by 180° about the second axis with respect to the first orientation, wherein the receiving structure is adapted to receive the relay nozzle in each of the first orientation and the second orientation such that a tip of the received relay nozzle points upwards. In particular, in case the first part is provided with the first contact surface that is inclined with respect to a second contact surface by the slanting angle, flipping the fastening unit by 180° allows for an adjustment of an inclination of the relay nozzle with respect to a surface of the sley profile contacted by the first contact surface, and, thus for an adjustment of a distance between a blowing opening of the relay nozzle and a reed.
In an embodiment, the receiving structure of the second part is provided with a protrusion, in particular a circular curved protrusion adapted to cooperate with grooves, in particular circular grooves at a circumference of the relay nozzle. In this case, the relay nozzle can only be arranged in the receiving structure in a number of discrete axial positions. The advantage is that the discrete axial positions can be pre-set and that the relay nozzle cannot move when the fixing bolt for fixing the second part to the first part is loosened.
According to a second aspect, a relay nozzle system comprising a fastening unit as described above and a relay nozzle is provided.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, embodiments of the invention will be described in detail with reference to the drawings. Throughout the drawings, the same elements will be denoted by the same reference numerals.

Fig. 1: shows a sley of an air-jet weaving machine comprising a sley profile, wherein several relay nozzle systems each comprising a relay nozzle and a fastening unit are fastened to the sley profile.
Fig. 2: shows the relay nozzle system in isolation in a perspective view.
Fig. 3: shows the relay nozzle system of Fig. 2 in an exploded view.
Fig. 4: shows a first part of the fastening unit of the relay nozzle system of Fig. 2 in a perspective view.
Fig. 5: shows the first part of Fig. 4 in a planar view in enlarged scale.
Fig. 6: shows a second part of the fastening unit of the relay nozzle system of Fig. 2 in a perspective view.
Fig. 7: shows the second part of Fig. 6 in a planar view in enlarged scale.
Fig. 8: shows the relay nozzle system of Fig. 2 mounted to the sley profile in two different orientations of the relay nozzle.
Fig. 9: shows in a side view the relay nozzle system of Fig. 2 mounted to the sley profile.
Fig. 10: shows in a side view the relay nozzle system of Fig. 9 mounted to the sley profile, wherein the fastening unit is flipped by 180°.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

Figure 1 shows a sley 1 of an air-jet weaving machine (not shown). The sley 1 comprises a sley profile 10 with a slot 12, wherein several relay nozzle systems 2 each comprising a relay nozzle 3 and a fastening unit 4 are fastened to the sley profile 10. Each relay nozzle 3 is fastened by means of the associated fastening unit 4 to the sley profile 10, such that the relay nozzles 3 are aligned in one line parallel to a width direction 14 of the sley profile 10.
Figures 2 and 3 show the relay nozzle systems 2 comprising the relay nozzle 3 and the fastening unit 4 in a perspective view and an exploded view. As shown in Fig. 2 and 3, the fastening unit 4 comprises a first part 41 and a second part 42, wherein the relay nozzle 3 can be clamped between the first part 41 and the second part 42.
Figs. 4 and 5 show the first part 41 in isolation. Figs. 6 and 7 show the second part 42 in isolation.
In the embodiment shown, in use the first part 41 of the fastening unit 4 is fastened to the sley profile 10. A side of the first part 41 facing the sley profile 10 is referred to as sley side 410. The second part 42 is coupled to the first part 41 at a side 411 opposite the sley side 410.
In the embodiment shown, a protruding tongue 412 is provided at the sley side 410 of the first part 41. In use, the protruding tongue 412 is inserted in the slot 12 of the sley profile 10, and the first part 41 is fastened to the sley profile 10 using a slot nut 51 and a threaded bolt 52 (see Fig. 3). The first part 41 has a first through hole 413 allowing for an insertion of the threaded bolt 52. In order to allow an access to the threaded bolt 52 after coupling the second part 42 to the first part 41, the second part 42 is provided with a second through hole 420 allowing for an access to the threaded bolt 52 using a tool, in particular an Allen Key (not shown). When untightening the threaded bolt 52 a position of the first part 41 along the width direction 14 (see Fig. 1) of the sley profile 10 is adjustable as indicated by an arrow 101 in Fig. 2.
Further, as indicated by three arrows 102, 103, 104 in Fig. 2, in the embodiment shown, a position of the relay nozzle 3 can be adjusted with respect to the first part 41 with three degrees of freedom.
As best seen in Figs. 3, 6, and 7, the second part 42 has a receiving structure 421 defining a first axis 105 and is adapted to receive the relay nozzle 3 such that a longitudinal axis 31 of the relay nozzle 3 is coaxially arranged to the first axis 105. In the embodiment shown, the receiving structure 421 is a groove, wherein the sides of the groove are adapted to cooperate with the mounting sleeves 33 of the relay nozzle 3, such that the relay nozzle 3 can be received in receiving structure 421 with no play, or even a slight oversize, or with only a neglectable play. As best seen in Fig. 3, the receiving structure 421 is mainly V-shaped and adapted for receiving the outer radius of the mounting sleeves 33 of the relay nozzle 3 with no play or with only a neglectable play.
As best seen in Figs. 3, 4, and 5, the first part 41 has a recess 415. The recess 415 is adapted for receiving the relay nozzle 3 with play. In the embodiment shown, the recess 415 has a flat base surface 416 and two side flanges 417 that are slanted with respect to the flat base surface 416, wherein when clamping the relay nozzle 3 between the first part 41 and the second part 42, the relay nozzle 3 abuts the flat base surface 416.
The second part 42 - with or without the relay nozzle 3 arranged in the receiving structure - can be coupled to the first part 41 via a coupling structure 7 so as to be rotatable about a second axis 106 (schematically indicated in Fig. 5 and 7), which second axis 106 is transverse, in particular perpendicular, to the first axis 105 (see Fig. 7) and intersects the first axis 105. In the embodiment shown, the second axis 106 intersects the first axis 105 in the area of the receiving structure 421.
In the embodiment shown, the coupling structure 7 comprises three coupling pairs, each coupling pair comprising a slot 71 and a pin 72, wherein each slot 71 is adapted to receive the corresponding pin 72 with play. The slots 71 are shaped such that there is a tangential play in the direction of rotation about the second axis 106, but only a small play in radial direction.
More particular, in the embodiment shown, the first part 41 is provided with three slots 71 at the side 411 opposite the sley side 410, which slots 71 are arranged along a circle 108 about the second axis 106. Similar, the second part 42 is provided with three pins 72 protruding from the second part 42 at a side facing in use the first part 41. The pins 72 are arranged along a circle about the second axis 106.
When coupling the second part 42 to the first part 41 by inserting the pins 72 into the slots 71, the relay nozzle 3 received in the receiving structure 421 of the second part 42 and the recess 415 of the first part 41 is rotatable together with the second part 42 about the second axis 106 with respect to the first part 41 about a limited range, for example about +/- 5°.
As best seen in Fig. 3, the second part 42 can be fixed to the first part 41 in a selected orientation using a fixing bolt 60, which is inserted from an outside of the fastening unit 4 through an elongated through hole 422 provided at the second part 42 and threaded into a threaded hole 414 provided at the first part 41. In the embodiment shown, a washer 61 is provided between the fixing bolt 60 and the second part 42.
Fig. 8 shows one relay nozzle system 2 mounted to the sley profile 10, wherein the second part 42 is fixed to the first part 41 in a first orientation shown in solid lines and in a second orientation shown in broken lines offset to the first orientation by an angle A.
As shown in Fig. 8, rotating the second part 42 with the relay nozzle 3 about the second axis 106 allows an adjustment of a so-called vertical blowing direction of the relay nozzle 3. As the second axis 106 intersects the first axis 105 (see Fig. 7), and thus the longitudinal axis 31 of the relay nozzle 3, a height position of a blowing opening 30, i.e. a distance of the blowing opening 30 from the sley profile 10, remains essentially the same when adjusting the vertical blowing direction. In use, the first part 41 is fastened to the sley profile 10. The second part 42 is mounted to the first part 41, wherein an orientation of the second part 42 and the relay nozzle 3 with respect to the first part 41 about the second axis 106 is settable.
Before tightening the fixing bolt 60 or after loosening the fixing bolt 60, the height position of the relay nozzle 3 with respect to the fastening unit 4 is also settable as indicated by an arrow 103 in Fig. 2. As best seen in Fig. 3, in the embodiment shown, the relay nozzle 3 is provided with several lines 34 for indicating a height of the relay nozzle 3 with respect to the fastening unit 4, in particular with respect to the second part 42 of the fastening unit 4.
In an alternative embodiment, instead of providing visible lines 34 on the relay nozzle 3, grooves such as circular grooves are provided on the relay nozzle. In an embodiment, these grooves are adapted to cooperate with protrusions such as curved protrusions, in particular circular curved protrusions provided on an outer edge 35 of the second part 42 of the fastening unit 4. In this case, the relay nozzle 3 can only be set in discrete axial positions along the longitudinal axis 31 of the relay nozzle 3. The advantage is that the discrete axial positions can be pre-set and that the relay nozzle 3 is secured in the second part 42 when the fixing bolt 60 for fixing the second part 42 to the first part 41 is not tightened.
Further, before tightening the fixing bolt 60 or after loosening the fixing bolt 60, an orientation about the longitudinal axis 31 of the relay nozzle 3 is settable as indicated by an arrow 104 in Fig. 2.
As shown in Figs. 9 and 10, in the embodiment shown, the fastening unit 4 is designed to be selectively used in a first orientation shown in Fig. 9 and in a second orientation shown in Fig. 10, wherein the fastening unit 4 is flipped by 180° about the second axis 106. As shown in Fig. 9 and 10, the fastening unit 4 can be fastened to the sley profile 10 in the first orientation or the second orientation, wherein in each orientation the relay nozzle 3 can be clamped between the first part 41 and the second part 42 such that a tip of the relay nozzle 3 points upwards.
As visible in Figs. 4 and 9 and 10, in the embodiment shown, the first part 41 is wedge-shaped, wherein the first part 41 has a first contact surface 418 at the sley side 410 adapted for contacting the sley profile 10 and the flat base surface 416 at the side 411 opposite the sley side 410, wherein the first contact surface 418 is inclined with respect to the flat base surface 416 by a slanting angle. The flat base surface 416 of the recess 415 (see Figs. 4 and 5) can extend in parallel to the outer surface 419. The longitudinal axis 31 of the relay nozzle 3 clamped between the first part 41 and the second part 42 extends parallel to the flat base surface 416, and non-parallel to the first contact surface 418.
In an embodiment (not shown), the first contact surface 418 is inclined by a slanting angle with respect to a second contact surface of the first part 41 perpendicular or almost perpendicular to the second axis 106, at which second contact surface the relay nozzle 3 contacts the first part 41. In the embodiment shown, the first contact surface 418 is inclined by a slanting angle with respect to a second contact surface of the first part 41 perpendicular or almost perpendicular to the second axis 106, which second contact surface of the first part 41 is formed by the flat base surface 416 of the recess 415, at which flat base surface 416 forming the second contact surface of the first part 41, the relay nozzle 3 contacts the first part 41. Hereby, the flat base surface 416 of the recess 415 for the relay nozzle 3 is inclined at a slanting angle over a few degrees to the first contact surface 418. For example, the slanting angle is between 0,5° and 5°.
Hence, when mounting the fastening unit 4 in the second orientation shown in Fig. 10, wherein the fastening unit 4 is flipped by 180° about the second axis 106 with respect to the first orientation shown in Fig. 9, an inclination of the relay nozzle 3 with respect to the sley profile 10 is altered, wherein a distance between a blowing opening 30 and a reed 8 can be altered. Hereby, the inclination angle of the relay nozzle 3 can be altered by twice the slanting angle.
This allows the use of the same fastening unit 4 for mounting relay nozzles 3 in different positions with respect to the reed 8 along the width direction 14 to the sley profile 10. In other words, the top of the relay nozzle 3 provided with the blowing opening 30 can be arranged with respect to a reed 8 provided on the sley profile 10 close to the reed 8 or farther away from the reed 8. It is clear that after flipping 180°, the height of the relay nozzle 3, in particular the position of the lines 34 with respect to the second part 42, has to be adjusted with respect to the second part 42.

Claims

Fastening unit for a relay nozzle (3) of an air-jet weaving machine with a sley profile (10) extending in a width direction (14), the fastening unit (4) comprising a first part (41) and a second part (42), wherein the first part (41) is adapted to be fastened to the sley profile (10), wherein the second part (42) has a receiving structure (421) defining a first axis (105) and is adapted to receive the relay nozzle (3) such that a longitudinal axis (31) of the relay nozzle (3) is coaxially arranged to the first axis (105), and wherein the second part (42) is coupled to the first part (41) via a coupling structure (7) so as to be rotatable about a second axis (106), which second axis (106) is transverse to the first axis (105) and intersects the first axis (105).
The fastening unit according to claim 1, characterized in that the second axis (106) intersects the first axis (105) in the area of the receiving structure (421).
The fastening unit according to claim 1 or 2, characterized in that the coupling structure (7) comprises three coupling pairs, each coupling pair comprising a slot (71) and a pin (72), wherein the slot (71) is adapted to receive the corresponding pin (72) with play, wherein one member of each pair is arranged to on the first part (41), and the other member of each pair is arranged on the second part (42), such that in use each pair allows a rotation of the second part (42) with respect to the first part (41) about the second axis (106)..
The fastening unit according to claim 1, 2 or 3, characterized in that the first part (41) has a threaded hole (414) and the second part (42) has a corresponding elongated through hole (422) for fixing the second part (42) to the first part (41) in a selected orientation about the second axis (106) using a fixing bolt (60).
The fastening unit according to any one of claims 1 to 4, characterized in that the receiving structure (421) in the second part (42) is a groove, wherein the groove is configured such that the relay nozzle (3) received in the groove protrudes from the second part (42), and wherein the first part (41) has a recess (415) adapted for receiving the protruding part of the relay nozzle (3) with play.
The fastening unit according to claim 5, characterized in that the recess (415) is adapted for receiving the relay nozzle (3) with play such that the relay nozzle (3) is rotatable about the second axis (106) about +/- 5°.
The fastening unit according to claim 5 or 6, characterized in that the recess (415) has a flat base surface (416) and side flanges (417) that are slanted with respect to the flat base surface (416), wherein the received relay nozzle (3) abuts the flat base surface (416).
The fastening unit according to any one of claims 1 to 7, characterized in that the first part (41) is adapted to be fastened to the sley profile (10) in a settable position along the width direction (14) of the sley profile (10).
The fastening unit according to any one of claims 1 to 8, characterized in that the first part (41) has a sley side (410), wherein the sley side (410) in use faces the sley profile (10), and wherein the second part (42) is coupled to the first part (41) at a side (411) opposite the sley side (410).
The fastening unit according to claim 9, characterized in that at the sley side (410) of the first part (41) a protruding tongue (412) is provided, which protruding tongue (412) is adapted for fastening the first part (41) to the sley profile (10) having a slot (12) using a slot nut (51).
The fastening unit according to claim 10, characterized in that the first part (41) has a first through hole (413) allowing for an insertion of a threaded bolt (52) for the slot nut (51), wherein the second part (42) has a coinciding second through hole (420) allowing for an access to the threaded bolt (52) using a tool.
The fastening unit according to any one of claims 9 to 11, characterized in that the first part (41) has a first contact surface (418) at the sley side (410) adapted for contacting the sley profile (10), wherein the first contact surface (418) is inclined by a slanting angle with respect to a second contact surface of the first part (41), in particular with respect to the flat base structure (416) of the first part (41), at which second contact surface the relay nozzle (3) contacts the first part (41).
The fastening unit according to any one of claims 1 to 12, characterized in that the fastening unit (4) is adapted to be fastened to the sley profile (10) in a first orientation and a second orientation flipped by 180° about the second axis (106) with respect to the first orientation, wherein the receiving structure (421) is adapted to receive the relay nozzle (3) in each of the first orientation and the second orientation such that a tip of the received relay nozzle (3) points upwards.
The fastening unit according to any one of claims 1 to 13, characterized in that the receiving structure (421) of the second part (42) is provided with a protrusion adapted to cooperate with grooves at a circumference of the relay nozzle (3).
Relay nozzle system comprising a fastening unit (4) according to any one of claims 1 to 14 and a relay nozzle (3).