Bearing system for a winding shaft of a curtain system and curtain system

Abstract

The invention relates to a bearing system for a winding shaft of a curtain system, comprising a bearing unit (11) and a fastening unit (21) for fastening the winding shaft (6) to the bearing unit (11), wherein the bearing unit (11) has an opening (13) in which the fastening unit (21) is at least partially arranged, wherein the fastening unit (21) has a fixed, first position in which the fastening unit (21) is held fixedly on the bearing unit (11), wherein the opening (13) of the bearing unit (11) extends along its longitudinal central axis (14) from a first end (15) to a second end (16), and wherein the fastening unit (21) has a released, second position in which the fastening unit (21) is slidably held on the bearing unit (11) between the first end (15) and the second end (16) of the opening (13).

Description

[0001] The invention relates to a bearing system for a winding shaft of a curtain system having the features according to the preamble of claim 1. Furthermore, the invention relates to a curtain system.

[0002] Blind systems, especially roller shutter systems, are typically used to shade door or window openings in a building. Such blind systems comprise a blind that is guided along two guide elements, particularly guide rails. The blind system also includes a winding roller arranged in a blind box. The winding roller is driven by a drive unit and serves to wind and unwind the blind. The blind is guided out of the blind box via an outlet slot. The winding roller is typically attached to the blind box via bearing systems.

[0003] Depending on the height of the building opening to be covered, a curtain of the appropriate length must be used. As the length increases, the diameter of the curtain naturally also increases when it is fully wound onto the winding shaft. Generally, the winding shaft should be mounted with its rotation axis as close as possible to the outlet slot to ensure the smoothest possible exit of the curtain from the outlet slot. Therefore, the optimal mounting position for a winding shaft in the curtain box depends, among other things, on the diameter of the wound-up curtain.

[0004] Bearing systems with multiple mounting points are known from the prior art, allowing variable positioning of the winding shaft with a single bearing system. The disadvantage of such bearing systems is the complex assembly of the curtain system, especially when changing the mounting position of the winding shaft.

[0005] The invention is therefore based on the object of specifying a bearing system for a winding shaft of a curtain system that enables the most variable positioning of the winding shaft in the curtain box while at the same time allowing simple assembly of the curtain system.

[0006] This object is achieved by a bearing system for a winding shaft of a curtain system according to the features of claim 1.

[0007] The invention is based on the further object of specifying a curtain system that enables the most variable positioning of the winding shaft in the curtain box while at the same time allowing simple assembly of the curtain system.

[0008] This object is achieved by a curtain system according to the features of claim 14.

[0009] The bearing system according to the invention for a winding shaft of a curtain system comprises a bearing unit and a fastening unit for fastening the winding shaft to the bearing unit. The bearing unit has an opening in which the fastening unit is at least partially arranged. The fastening unit has a fixed, first position in which the fastening unit is held fixedly to the bearing unit. The opening of the bearing unit extends along its longitudinal central axis from a first end to a second end. The fastening unit has a released, second position in which the fastening unit is held displaceably on the bearing unit between the first end and the second end of the opening.

[0010] The movable mounting unit allows the winding shaft to be realigned on the bearing plate even if it is already attached to the mounting unit. If the installer determines that the winding shaft needs to be moved vertically or horizontally, they can loosen the mounting unit, move it on the bearing plate until the desired position of the winding shaft is achieved, and then re-secure the mounting unit. Removing the winding shaft from the bearing plate is not necessary, allowing for easy, even subsequent, adjustment of the winding shaft position.

[0011] The curtain system according to the invention comprises a first such bearing system and a second such bearing system. A winding shaft is held between the first bearing system and the second bearing system at their respective ends. The winding shaft is designed to wind and unwind a curtain. The first bearing system is attached to a first guide rail. The second bearing system is attached to a second guide rail. The curtain is guided between the two guide rails.

[0012] The adjustability of the position of the fastening unit relative to the bearing unit allows the distance between the winding shaft and the guide rails to be easily adjusted.

[0013] It is advantageous for the opening of the bearing unit to be designed as an elongated hole. The fastening unit can be moved within the elongated hole of the bearing unit. Preferably, the fastening unit on the bearing unit is continuously adjustable between the first end and the second end of the opening. This allows for particularly precise adjustment of the position of the winding shaft.

[0014] Particularly advantageously, the fastening unit is held fixed to the bearing unit in a form-fitting and / or frictional manner. Preferably, several fixing openings are formed on the bearing unit, which serve to fix the fastening unit to the bearing unit in a form-fitting manner by means of a connecting element, in particular by means of a screw connection, a pin connection, a bolt connection, or the like. It is particularly advantageous that the fixing openings form an additional, optional fastening option for the fastening unit to the bearing plate.

[0015] It is advantageous for the bearing unit to have a flat bearing plate on which the opening is formed. The bearing plate is preferably formed in one piece. In an alternative embodiment, the bearing plate can also be formed in multiple parts.

[0016] In particular, it is provided that the fastening unit comprises a cover plate, a shaft receptacle, and a counter plate, wherein the shaft receptacle is arranged at least partially between the cover plate and the counter plate. The shaft receptacle is preferably designed as a separate component from the cover plate and the counter plate. In an alternative embodiment, it can also be provided that the shaft receptacle is firmly connected to the cover plate or the counter plate, in particular, is formed as a single piece.

[0017] It is preferably provided that the bearing unit comprises a connecting unit, via which the bearing plate can be fastened to a guide rail. The connecting unit is designed as a separate component. In an alternative embodiment, however, it can also be provided that the connecting unit is formed on the bearing plate. The bearing plate preferably has a first receptacle at its lower end, via which the bearing plate is fastened to the connecting unit.

[0018] It is advantageous that the connecting unit can be screwed to the bearing plate and to a guide rail. For this purpose, the connecting unit preferably has a tongue that is inserted into the guide rail and screwed to it. The bearing plate is attached to the other end of the tongue. The bearing plate has a second receptacle at its upper end for suspending the bearing plate in a curtain box of a curtain system. Thus, the bearing plate can be attached to corresponding supporting structures in several ways.

[0019] Preferably, a first guide groove and a second guide groove are provided on the bearing plate, wherein a connecting element for connecting the cover plate and the counter plate is guided in the guide groove, preferably in the direction of the longitudinal center axis of the opening. The connecting element guided in the guide groove enables easy displacement of the fastening unit on the bearing plate.

[0020] Further features of the invention will become apparent from the description and the drawing, which illustrates a detailed embodiment of the invention. They show: Fig. 1 in a perspective, schematic representation of the curtain system according to the invention, Fig. 2 in a schematic side view of the bearing unit with the fastening unit, Fig. 3 in a schematic side view the bearing plate and Fig. 4 shows the fastening unit in a schematic sectional view.

[0021] The curtain system 1 comprises a curtain 4, a first guide rail 2 and a second guide rail 3. The first guide rail 2 and the second guide rail 3 are formed in the exemplary embodiment laterally of the curtain 4 and serve to guide the curtain 4. The curtain system 1 is mounted in the exemplary embodiment on an external facade 41 of a building in front of a window 42. The window 42 is in Fig. 1 is represented only by a dashed line. The curtain system 1 can also be arranged on the inside of the building in front of the window 42.

[0022] As in Fig. 1, the curtain system 1 comprises a curtain box 5. The curtain box 5 is arranged horizontally. The curtain box 5 is arranged above the window 42. The curtain box 5 can be designed as a front-mounted box or as a top-mounted box. The curtain system 1 comprises a first bearing system 10 and a second bearing system 10'. Both bearing systems 10, 10' are preferably arranged in the curtain box 5. Furthermore, the curtain system 1 comprises a winding shaft 6. The winding shaft 6 is held by the first bearing system 10 and the second bearing system 10' and is designed to wind up and unwind the curtain 4. The winding shaft 6 is arranged in the curtain box 5.

[0023] The curtain system 1 also comprises a drive unit (not shown in detail) that rotates a shaft of the winding shaft 6. In one embodiment, the drive unit can be designed as a belt pulley with a belt wound on the belt pulley. The operator can use the belt to rotate the shaft of the winding shaft 6. In another embodiment of the curtain system 1, the drive unit can be designed as a drive motor with a control unit. The drive motor is designed as an electric motor that is operatively connected to the shaft of the winding shaft 6 and drives it in rotation. By means of the drive unit 7, the curtain can be moved electrically upwards and downwards. Thus, the drive unit 7 serves to carry out an upward movement 43 and 44 a downward movement 9 of the curtain 4.

[0024] As in Fig. 1, the first guide rail 2 and the second guide rail 3 are aligned parallel to one another. The two guide rails 2, 3 each have a longitudinal center axis, which are preferably aligned parallel to one another. The guide rails 2, 3 are in particular aligned such that their longitudinal center axes run vertically. A guide slot is formed on each of the guide rails 2, 3, in which the curtain 4 is guided. The guide slots also extend essentially in a vertical direction. The guide rails 2, 3 are arranged at a distance from one another that approximately corresponds to the width of the building opening to be shaded. The guide rails 2, 3 span a guide section 45, within which the curtain 4 is movable. The guide rails 2, 3 are fastened, in particular screwed, to the outer facade 41. Alternatively, the guide rails 2, 3 can also be fastened to a window frame.Other fastening options for the guide rails 2, 3 are also conceivable. The curtain system 1 can be designed for shading or covering various openings in a building, such as window or door openings. For particularly large building openings, more than two guide rails 2, 3 can be provided.

[0025] In the present embodiment, the curtain system 1 is designed as a roller shutter system, in which the curtain 4 corresponds to a roller shutter curtain. In an alternative embodiment, the curtain system can also be designed as a Venetian blind system, insect screen system, or the like. Such systems are well known in the art and therefore need not be described in detail.

[0026] In Fig. 2 shows the bearing system 10 according to the invention. The bearing system 10 serves to support the winding shaft 6 of the curtain system 1. The bearing system 10 comprises a bearing unit 11 and a fastening unit 21. The fastening unit 21 is designed such that the winding shaft 6 is fastened to the bearing unit 11 via the fastening unit 21. The fastening unit 21 serves to releasably fasten the winding shaft 6 to the bearing unit 11.

[0027] As in Fig. 2, the bearing unit 11 comprises an opening 13. The fastening unit 21 is at least partially arranged in the opening 13. The opening 13 extends along its longitudinal center axis 14 from a first end 15 to a second end 16. The opening 13 is designed such that the fastening unit 21 is held on the bearing unit 11 in a released position between the first end 15 and the second end 16 of the opening 13. The fastening unit 21 has at least two positions, namely a first position in which the fastening unit is fixed to the bearing unit 11, and the second position in which the fastening unit is held on the bearing unit 11 so as to be displaceable at least in the direction of the longitudinal center axis 14 of the opening 13.

[0028] As in the Fig. 2 and Fig. As shown in Figure 3, the bearing unit 11 comprises a bearing plate 12 on which the opening 13 is formed. The bearing plate 12 is preferably flat. The bearing plate 12 is particularly preferably formed in one piece. The bearing plate 12 is preferably made of a metal material, in particular aluminum. The bearing plate 12 can be produced, for example, by a stamping process.

[0029] As in Fig. 2, the opening 13 is designed as an elongated hole. The opening extends in the direction of the longitudinal center axis 14 over a length a. The length a corresponds to the distance between the first end 15 and the second end 16 of the opening 13. Furthermore, the opening 13 has a width b which is measured perpendicular to the length a in the plane of extension of the opening 13. The length a of the opening 13 is greater than the width b of the opening 13. The length a of the opening 13 preferably corresponds to at least 1.3 times, in particular at least 1.5 times, advantageously at least 1.8 times the width b of the opening. In the present embodiment, the length a of the opening 13 corresponds approximately to twice the width b of the opening 13. In the preferred embodiment, the opening 13 is designed as a through-opening. In an alternative embodiment, it can also be provided that the opening at least partially has a bottom.Such an opening 13 could, for example, be produced by a deep-drawing process. The opening 13 is designed as a closed opening. In other words, the opening 13 has a continuous peripheral wall 19 that delimits the opening 13. Thus, the bearing plate 13 has a high degree of rigidity in order to transfer the forces emanating from the winding shaft 6 to the guide rails 2, 3 and / or the curtain box 5. In an alternative embodiment, the opening 13 can also be partially open, i.e., the peripheral wall 19 of the opening 13 can have an interruption. Such a partially open opening 13, in contrast, has a lower degree of rigidity than a closed opening 13.

[0030] As in Fig. 2, the fastening unit 21 is at least partially arranged in the opening 13 of the bearing unit 11. In Fig. 4 shows a schematic cross-section of the fastening unit 21. The fastening unit 21 comprises a cover plate 24, a shaft receptacle 25, and a counter plate 26. The shaft receptacle 25 is at least partially arranged between the cover plate 24 and the counter plate 26. The shaft receptacle 25 is preferably fixed, in particular clamped, between the cover plate 24 and the counter plate 26. The cover plate 24 and the counter plate 26 are preferably connected to one another via at least one screw connection 27. In the preferred exemplary embodiment, two screw connections 27 are provided. When the screw connections 27 are tightened, the shaft receptacle 25 is fixed, in particular clamped, between the cover plate 24 and the counter plate 26. In an alternative embodiment, it can also be provided that the shaft receptacle 25 is formed integrally with the cover plate 24 or the counter plate 26.The shaft holder 25 also has a central axis 28, which also corresponds to the rotational axis of the winding shaft 6. The shaft holder 25 is held in a rotationally fixed manner on the cover plate 24 and / or the counter plate 26 in the fixed position of the fastening unit 21. For this purpose, the shaft holder 25 is held in particular in a form-fitting manner in the circumferential direction of the central axis 28 on the cover plate 24 and / or the counter plate 26. This form-fitting connection is not shown in detail in the figures.

[0031] As in the Fig. 2 and Fig. As shown in Figure 4, the fastening unit 21 has at least one connecting element 37. In the exemplary embodiment, the connecting element 37 is formed on the cover plate 24 and engages in a counter-opening 38 formed on the cover plate 26. In the present exemplary embodiment, four connecting elements 37 are provided, which engage in corresponding counter-openings 38. A different number of connecting elements 37 may also be expedient. The cover plate 24 and counter-plate 26 are aligned and held relative to one another by the connecting elements 37.

[0032] A further function of the connecting element 37 is to guide the fastening unit 21 on the bearing plate 12. As shown in the Fig. 2 and Fig. 3, the bearing plate 12 comprises at least one guide opening 35, 36. The at least one guide opening 35, 36 is formed separately from the opening 13 of the bearing plate 12. In the present exemplary embodiment, the at least one guide opening 35, 36 is formed as a guide groove, in particular as a first guide groove 35 and as a second guide groove 36. The first guide groove 35 and the second guide groove 36 extend in their longitudinal direction parallel to the longitudinal central axis 14 of the opening 13. The first guide groove 35 and the second guide groove 36 are aligned parallel to one another. The first guide groove 35 and the second guide groove 36 are arranged opposite one another, in particular mirror-symmetrically, with respect to the longitudinal central axis 14 of the opening 13. The connecting elements 37 run through the guide grooves 35, 36 and are guided on them.To ensure precise guidance of the connecting elements 37 in the guide grooves 35, 36, the connecting elements 37 have a rectangular cross-section. In the preferred embodiment, the connecting elements 37 are formed adjacent to the screw connections 27, which also protrude through the guide grooves 35, 36. If the fastening unit 21 is in the released position, i.e. the screw connection 27 is loosened, the fastening unit 21 can be guided in the direction of the longitudinal center axis 14 of the opening 13 with the connecting elements 37, the screw connections 27 in the first guide groove 35 and the second guide groove 36. If the screw connection 37 is only partially loosened, the fastening unit 21 can be moved in the direction of the longitudinal center axis 14 of the opening 13, but is held captively on the bearing plate 12.

[0033] As in the Fig. 2 and Fig. 3, the bearing plate 12, in its installed position, is aligned with its longitudinal center axis 14 at an angle to a vertical direction 46. The vertical direction corresponds to the direction of gravity. The bearing plate 12 is particularly preferably aligned such that the longitudinal center axis 14 of the opening 13 is aligned at an angle of approximately 45° to the vertical direction. By moving the fastening unit 21 on the bearing plate 12, the height can be adjusted in the vertical direction and the winding shaft 6 can be adjusted laterally in the horizontal direction. The adjustment can be stepless, i.e. continuous. The position of the winding shaft can therefore be adjusted easily depending on the length of the curtain.

[0034] As in the Fig. 2 and Fig. 3, several fixing openings 17 are provided on the bearing plate 12. At least one further fixing opening 29 is provided on the fastening unit 21. For a positive connection between the fastening unit 21 and the bearing plate 12, a connecting element (not shown in detail) is to be arranged in the further fixing opening 29 of the fastening unit and simultaneously in one of the several fixing openings of the bearing plate 12. The connecting element can be designed, for example, as a bolt, a pin, a screw, etc. Thus, the fastening unit 21 can be fastened to the bearing unit 11, in particular to the bearing plate 12, in a positive and / or frictional manner. As shown in Fig. 3, the plurality of fixing openings 17 are divided into two rows. The rows each extend in the direction of the longitudinal center axis 14 of the opening 13. In this way, the fastening unit 21 can be moved along the longitudinal center axis 14 and held at various positions on the bearing plate 12 with connecting elements via the fixing openings 17. The fixing openings 17 serve as an optional fastening option in addition to the screw connection 27. In the present exemplary embodiment, each row comprises five fixing openings 17. A different number of fixing openings 17 may also be expedient. The fixing openings 17 of each row run parallel to the two guide grooves 35, 36. The fixing openings 17 of each row are arranged adjacent to at least one of the two guide grooves 35, 36.

[0035] As in Fig. 4, the fastening unit 21 comprises a winding shaft holder 39. The winding shaft holder 39 is connected to the shaft receptacle 25 in a rotationally fixed manner about the central axis 28. Furthermore, a through-opening 40 is formed on the winding shaft holder 39, which is coaxial with the central axis 28. The winding shaft holder 39 and the through-opening 40 are shown in dashed lines. The winding shaft 6 preferably comprises a fixed part (not shown in detail) and a rotating part (not shown in detail), wherein the fixed part of the winding shaft 6 is held in a rotationally fixed manner in the through-opening 40 of the winding shaft holder.

[0036] As in Fig. 2, the bearing unit 11 comprises a connecting unit 18, via which the bearing plate 12 can be fastened to the guide rail 2, 3. As shown in Fig. 3, the bearing plate 12 extends along the longitudinal center axis 14 of the opening 13 from a lower end 31 to an upper end 32. In the intended installation position, as shown in the Fig. 2 and Fig. 3, the upper end 32 lies above the lower end 31 with respect to the vertical direction 46. At the lower end 31 of the bearing plate 12, a first receptacle 33 is provided, via which the bearing plate 12 is fastened to the connecting unit 18. The first receptacle 33, in conjunction with a mating contour (not shown in detail) of the connecting unit 18, is designed as a plug-in connection which is additionally fixed by a screw connection. A tongue 20 is formed on the connecting unit 18. While one end of the tongue 20 is connected to the first receptacle 33 of the bearing plate 12, the free end of the tongue 20 is arranged in the guide rail 2, 3 and screwed to it.

[0037] The connecting unit 18 also has a funnel 30 attached to the upper end of the tongue 20. The curtain 4 is guided into the guide rails 2, 3 via the funnel 30. The funnel 30 can be designed such that it is plugged and / or screwed onto the tongue 20 of the connecting unit 18. Alternatively, the funnel can also be attached directly to the bearing plate 12. By adjusting the position of the fastening unit 21 on the bearing plate 12, the distance between the fastening unit 21 and the funnel 30 can be adjusted so that the curtain 4 slides into the guide rails 2, 3 with the lowest possible frictional forces.

[0038] As in the Fig. 2 and Fig.As shown in Figure 3, a second receptacle 34 is provided at the upper end 32 of the bearing plate 12. The second receptacle 34 is formed from at least one opening, in this case from several, in particular four, openings. The bearing plate 12 can be suspended in the curtain box 5 of the curtain system 1 via the second receptacle 34. For this purpose, the bearing plate 12 can be attached to a support (not shown in detail), for example, by means of plug connections, screw connections, etc.

[0039] During assembly of the curtain system 1, the bearing plate 12 can be fastened to a corresponding support structure (not shown in detail) via its first receptacle 33 and / or its second receptacle 34. The fastening unit 21 can then be fastened to the bearing plate 12. For this purpose, the cover plate 24 is arranged on one side of the bearing plate 12, and the counter plate 26 on the opposite side of the bearing plate 12. If the shaft receptacle 25 is designed as a separate component, it is to be arranged between the cover plate 24 and the counter plate 26. The connecting elements 37 of the cover plate 24 are to be guided through the guide grooves 35, 36 of the bearing plate 12. The counter plate 26 is then to be slipped onto the cover plate 24 so that the connecting elements 37 of the cover plate 24 also protrude through the counter openings 38 of the counter plate 26.The screws of the two screw connections 27 must then be screwed into the counter plate 24; these also each protrude through one of the two guide grooves 35, 36 and engage in the cover plate 24. If the two screw connections 27 are not tightened, the fastening unit 21 can be moved along the longitudinal center axis 14 of the opening in the bearing plate 12. The fastening unit 21 is in its released position. Once the desired position of the fastening unit 21 has been set, the screw connection 27 can be tightened. The fastening unit 21 is fixed and is in its second position. Relative movement of the fastening unit 21 relative to the bearing plate 12 is now no longer possible. In addition, the fastening unit 21 can be fixed to the bearing plate 12 using further connecting elements in the fixing openings 17 in the bearing plate 12 and in the further fixing openings 29 in the fastening unit 21.The winding shaft 6 can then be inserted into the shaft holder 25. A different order of the individual assembly steps may also be appropriate. If the operator wishes to adjust the position of the winding shaft 6, they can loosen the fastening unit 21 again and move the fastening unit 21 into the desired position relative to the bearing plate 12. Removing the winding shaft 6 from the shaft holder 25 is not necessary. The fastening unit 21 can then be reattached. This allows for easy adjustment of the position of the winding shaft 6.

Claims

[1] Bearing system for a winding shaft of a curtain system, comprising a bearing unit (11) and a fastening unit (21) for fastening the winding shaft (6) to the bearing unit (11), wherein the bearing unit (11) has an opening (13) in which the fastening unit (21) is at least partially arranged, wherein the fastening unit (21) has a fixed, first position in which the fastening unit (21) is held fixed to the bearing unit (11), characterized by that the opening (13) of the bearing unit (11) extends along its longitudinal center axis (14) from a first end (15) to a second end (16), and that the fastening unit (21) has a released, second position in which the fastening unit (21) is held displaceably on the bearing unit (11) between the first end (15) and the second end (16) of the opening (13). [2] Storage system according to claim 1, characterized bythat the opening (13) of the bearing unit (11) is designed as an elongated hole. [3] Storage system according to claim 1 or 2, characterized by that the fastening unit (21) on the bearing unit (11) is continuously adjustable between the first end (15) and the second end (16) of the opening (13). [4] Storage system according to one of claims 1 to 3, characterized by that the fastening unit (21) is held fixed to the bearing unit (11) in a form-fitting and / or frictional manner. [5] Storage system according to one of claims 1 to 4, characterized by that a plurality of fixing openings (17) are formed on the bearing unit (11), which serve for the positive fixing of the fastening unit (21) to the bearing unit (11) by means of a connecting element, in particular by means of a screw connection, a pin connection, a bolt connection or the like. [6] Storage system according to one of claims 1 to 5, characterized bythat the bearing unit (11) has a flat bearing plate (12) on which the opening (13) is formed. [7] Storage system according to claim 6, characterized by that the bearing plate (12) is formed in one piece. [8] Storage system according to one of claims 1 to 7, characterized by that the fastening unit (21) comprises a cover plate (24), a shaft receptacle (25) and a counter plate (26), wherein the shaft receptacle (25) is arranged at least partially between the cover plate (24) and the counter plate (26). [9] Storage system according to one of claims 6 to 8, characterized by that the bearing unit (11) comprises a connecting unit (18) via which the bearing plate (12) can be fastened to a guide rail (2, 3). [10] Storage system according to one of claims 6 to 9, characterized bythat the bearing plate (12) has at its lower end (31) a first receptacle (33) via which the bearing plate (12) is fastened to the connecting unit (18). [11] Storage system according to one of claims 6 to 10, characterized by that the connecting unit (18) can be screwed to the bearing plate (12) and to a guide rail (2, 3). [12] Storage system according to one of claims 6 to 11, characterized by that the bearing plate (12) has at its upper end (32) a second receptacle (34) for suspending the bearing plate (12) in a hanging box (5) of a hanging system (1). [13] Storage system according to one of claims 8 to 12, characterized bythat a first guide groove (35) and a second guide groove (36) are provided on the bearing plate (12), wherein at least one connecting element (37) for connecting the cover plate (24) and the counter plate (26) is guided in the guide grooves (35, 36), preferably in the direction of the longitudinal center axis (14) of the opening (13). [14] Curtain system comprising a first bearing system (10) according to one of the preceding claims, a second bearing system (10') according to one of the preceding claims, a winding shaft (6) for winding and unwinding a curtain (4), wherein the winding shaft (6) is held at one end on the first bearing system (10) and at its other end on the second bearing system (10'). [15] Curtain system according to claim 14, characterized bythat the first bearing system (10) is fastened to a first guide rail (2) and that the second bearing system (10') is fastened to a second guide rail (3), wherein the curtain (4) is guided between the two guide rails (2, 3).

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