Abstract:
A method of fastening a flexible sheet-like structure on a tubular winding shaft including: introducing, in a circumference of the tubular winding shaft, at least one aperture which passes through a wall of the winding shaft, a width of the aperture being greater than the thickness of the flexible sheet-like structure, cutting into the flexible sheet-like structure to produce at least one angleable tab, and inserting the tab into the aperture of the winding shaft. Additionally, a roller blind includes a winding shaft and a flexible sheet-like structure fastened thereon.

Description:
FIELD OF THE INVENTION 
     The invention relates to a method of fastening a flexible sheet-like structure on a tubular winding shaft. The invention also relates to a roller blind having a winding shaft and a sheet-like structure fastened thereon. 
     BACKGROUND OF THE INVENTION 
     Roller blinds are used in a variety of ways in motor vehicles and/or in other application areas. For example, roller blinds are used in vehicles to secure baggage, as a screen, as a sunshade or the like. Roller blinds comprise, in principle, a tubular winding shaft on which a flexible sheet-like structure, for example a canvas or a netting material, is fastened such that it can be wound up and unwound. 
     In order to produce a roller blind, it is usually the case that first all the desired size of flexible sheet-like structure or roller-blind web is cut out of the desired material. The roller-blind web is usually cut such that lateral tabs, which project beyond lateral peripheries determining the width of the roller-blind web, remain at a rear end of the roller-blind web, by which the roller-blind web is fastened on the winding shaft. The tabs give rise, for example, to a T-shaped roller-blind web. For fastening the roller-blind web on the winding shaft, the end of the roller-blind web is adhesively bonded to the winding shaft, the tabs projecting laterally beyond the peripheries being folded over and inserted into the winding shaft from the ends of the latter. The act of inserting the tabs into the interior of the tubular winding shaft allows good, secure fastening. In order to form such tabs, however, it is first of all necessary to provide a material with a width which corresponds to the width of the roller-blind web plus the width of the two lateral tabs. With the exception of the tabs, the excess material is removed, in a further step, from the lateral peripheries of the roller-blind web. Production of such a roller blind thus results in a lot of material of the sheet-like structure being wasted. 
     It is an object of the invention to provide a method of fastening a flexible sheet-like structure on a winding shaft in which waste is reduced. It is a further object of the invention to provide a corresponding roller blind. 
     This object is achieved by a method of fastening a flexible sheet-like structure, in particular a canvas, on a tubular, in particular hollow-cylindrical, winding shaft, comprising the following steps: introducing, in a circumference of the tubular winding shaft, at least one aperture which passes through a wall of the winding shaft, a width of the aperture being greater than a thickness of the flexible sheet-like structure; producing an angleable tab on the flexible sheet-like structure, and inserting the angled tab into the at least one aperture on the winding shaft. The flexible sheet-like structure is usually rectangular with a longitudinal direction along which it can be wound up and unwound, also referred to as the winding-up direction, and a transverse direction. The width of the flexible sheet-like structure, i.e. the extent in the transverse direction, is usually essentially equal to the length of the winding shaft in its axial direction, it being possible for the winding shaft to project beyond the flexible sheet-like structure in the axial direction of the winding shaft for better handling. Introduction according to the invention of apertures on the circumference of the winding shaft makes it possible to insert tabs at a location other than the open ends of the winding shaft, for fastening in the winding shaft. The sheet-like structure has preferably already been cut to a normal size which is appropriate for the function of the roller blind. The sheet-like structure may additionally be adhesively bonded to the winding shaft. Fitting by means of tabs can prevent rotation and/or displacement of the canvas relative to the winding shaft even if additional adhesive bonding should fail and/or if there is no additional adhesive bonding provided. The tab can be produced at a corner of the flexible sheet-like structure by folding. 
     In a further configuration, the flexible sheet-like structure is fixed on the winding shaft by a bushing, in particular a bearing bushing, which can be inserted into the end of the winding shaft. An inserted bushing can cover the tab inserted into the winding shaft, in which case the bushing clamps the tab firmly in place on an inner wall of the winding shaft. In one embodiment, the bushing is a bearing bushing and thus serves for bearing the winding shaft and for fastening the flexible sheet-like structure on the winding shaft. Instead of the bearing bushing, however, it is also possible to use a latching bushing, in which case a separate element serves for bearing the shaft. 
     In a further configuration, the tab is produced by cutting into- a flexible sheet-like structure and/or by deformation at a lateral periphery and/or an end edge of the flexible sheet-like structure. The sheet-like structure has preferably already been cut to a normal size which is appropriate for the function of the roller blind. According to the invention, the cutting or angling operation for forming the tab give rise to only minimal waste, if any at all. In other configurations, however, it may be advantageous if the tab projects longitudinally and/or transversely beyond the normal, functionally appropriate size of a roller-blind web. Fastening according to the invention likewise makes it possible at least to reduce waste. 
     In a development of the method, the at least one aperture is designed as a slot in the circumferential direction with an arc length which is smaller than the circumference of the tubular winding shaft, and produced on the flexible sheet-like structure, by a cut in the transverse direction of the flexible sheet-like structure, is at least one tab which corresponds to the slot and has a length which, at most, is equal to the arc length. In a preferred configuration of the invention, the cut in the transverse direction is started at a lateral periphery of the flexible sheet-like structure. One cut can thus produce a tab which can be angled at any desired angle for fastening purposes. If the cut, in contrast, is formed in the sheet-like structure at a distance from a lateral periphery, then deformation of the flexible sheet-like structure which is necessary for angling the tab can be simplified by further cuts. 
     In one exemplary embodiment, the at least one slot is introduced in the circumferential direction at a distance from one end of the winding shaft, a width of the tab being approximately equal to the distance of the slot from the end of the winding shaft. It is possible here for a flexible sheet-like structure, of which the width corresponds to the length of the winding shaft in the axial direction, to be fitted on the winding shaft without any waste. In one configuration, the width of the tab, by an appropriate cut, may also be selected to be greater than the distance of the slot from the end of the winding shaft, the tab not being inserted into the slot on the winding shaft over the entire width. The slot is preferably introduced in the circumferential direction at a distance from the end of the winding shaft which is smaller than a length of a bushing which can be inserted into the end of the winding shaft, the distance corresponding, in particular, approximately to a quarter to three quarters of the length, preferably approximately half the length. 
     In a development of the method, at least one tab is produced on the flexible sheet-like structure by the first cut in the transverse direction, and a second cut, which crosses the first cut in the longitudinal direction, of the flexible sheet-like structure. The second cut here is preferably introduced from an end edge which can be fastened on the winding shaft. In other configurations, a third cut is introduced in order for a tab which can be angled at right angles to be produced by three cuts arranged in a U-shaped manner. 
     In a development of the method, the aperture is produced as a cutout which is open toward the end of the winding shaft. Such a cutout allows particularly straightforward insertion of the tab. The arc length of the cutout here should be selected such that the winding shaft is not overly weakened by the cutout. 
     In a development of the invention, the aperture is produced as an essentially U-shaped and/or V-shaped cutout. A corresponding tab on the sheet-like structure can be produced by one or two slots, it being possible for the tab, for fastening purposes, to be clamped beneath the nose formed by the V-shaped or U-shaped aperture. 
     In a development of the method, the at least one aperture is introduced into the winding shaft at at least one end as a slot in the axial direction, a tab which corresponds to the slot being produced in the flexible sheet-like structure. In one configuration, the tab is produced by at least one cut in the longitudinal direction of the flexible sheet-like structure. In one configuration of the invention, the cut in the longitudinal direction terminates at the end edge of the flexible sheet-like structure. One cut thus produces a tab which can be angled at any desired angle and can be inserted into a correspondingly oriented slot of the winding shaft. In other configurations, the longitudinal cut is produced at a distance from the edge, this producing an angleable tab which can be pushed, for example, onto a corresponding nose on the winding shaft. 
     In one embodiment of the method, the flexible sheet-like structure is adhesively bonded to the winding shaft. Adhesive bonding here can take place both on the tabs and in regions between the tabs. 
     In a development of the method, the bushing has a latching nose which, when the bushing is pushed into the winding shaft, is pushed over the tab inserted into the aperture. 
     The object is also achieved by a roller blind, in particular a roller blind for fitting in a motor vehicle, comprising a tubular winding shaft and a sheet-like structure which is fastened thereon such that it can be wound up and unwound, wherein the winding shaft has at least one aperture which penetrates a wall and has a width which is greater than a thickness of the flexible sheet-like structure, and the flexible sheet-like structure has at least one angleable tab which, for connection of the flexible sheet-like structure to the winding shaft, is inserted into the interior of the winding shaft via the aperture. Insertion of the sheet-like structure into the winding shaft allows the sheet-like structure to be fastened on the winding shaft in the interior of the latter, for example to be adhesively bonded and/or clamped to the same, preferably by way of a bushing. 
     Further advantages of the invention can be gathered from the following description of exemplary embodiments of the invention which are illustrated schematically in the drawings. The same or similar components are indicated in the drawings by like designations. All the features and/or advantages, including design details, spatial arrangements and method steps, which can be gathered from the claims, the description or the drawings may be essential to the invention both on their own and in a wide variety of different combinations. Features which are illustrated or described as part of an exemplary embodiment can likewise be used in another exemplary embodiment in order to obtain a further embodiment of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the drawings: 
         FIG. 1   a  shows a winding shaft for a roller blind according to a first exemplary embodiment of the invention; 
         FIG. 1   b  shows a flexible sheet-like structure for the winding shaft according to  FIG. 1   a;    
         FIG. 1   c  shows a roller blind comprising a winding shaft according to  FIG. 1   a  and a flexible sheet-like structure according to  FIG. 1   b  fitted thereon; 
         FIG. 2   a  shows a winding shaft for a roller blind according to a second exemplary embodiment of the invention; 
         FIG. 2   b  shows a flexible sheet-like structure for the winding shaft according to  FIG. 2   a;    
         FIG. 3   a  shows a winding shaft for a roller blind according to a third exemplary embodiment of the invention; 
         FIG. 3   b  shows a flexible sheet-like structure for the winding shaft according to  FIG. 3   a;    
         FIG. 3   c  shows a roller blind comprising a winding shaft according to  FIG. 3   a  and a flexible sheet-like structure according to  FIG. 3   b  fitted thereon; 
         FIG. 4   a  shows a winding shaft for a roller blind according to a fourth exemplary embodiment of the invention; 
         FIG. 4   b  shows a flexible sheet-like structure for the winding shaft according to  FIG. 4   a;    
         FIG. 4   c  shows a roller blind comprising a winding shaft according to  FIG. 4   a  and a flexible sheet-like structure according to  FIG. 4   b  fitted thereon; 
         FIG. 5   a  shows a winding shaft for a roller blind according to a fifth exemplary embodiment of the invention; 
         FIG. 5   b  shows a roller blind comprising a winding shaft according to  FIG. 5   a  and a flexible sheet-like structure according to  FIG. 4   b  fitted thereon; 
         FIG. 6   a  shows a winding shaft for a roller blind according to a sixth exemplary embodiment of the invention; 
         FIG. 6   b  shows a flexible sheet-like structure for the winding shaft according to  FIG. 6   a;    
         FIG. 7  shows an exploded illustration of a winding shaft, a flexible sheet-like structure and a bushing for a roller blind according to a seventh exemplary embodiment of the invention; and 
         FIG. 8  shows an exploded illustration of a winding shaft, a flexible sheet-like structure and a bushing for a roller blind according to an eighth exemplary embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION 
       FIGS. 1   a  to  1   c  show, schematically, a first exemplary embodiment of the invention.  FIG. 1   c  here shows a roller blind  1  comprising a winding shaft  2  and a flexible sheet-like structure  3 , in particular a canvas, fastened thereon.  FIG. 1   a  shows, schematically, a perspective illustration of the winding shaft  2  and  FIG. 1   b  shows, schematically, a plan view of the sheet-like structure  3 . 
     As can best be seen in  FIG. 1   a , two slots  20  are formed in a circumference of the winding shaft  2 . The slots  20  each extend with an arc length L_S in the circumferential direction. The slots  20  are formed at the two ends  21 ,  22  of the tubular winding shaft  2  in each case at a distance A_S from the associated end  21 ,  22 . If the winding shaft  2  has a regular periphery at the ends  21 ,  22  as illustrated, then the distance A_S is constant. In the case of an irregular periphery (not illustrated), it is necessary to define corresponding reference points for the distance A_S. 
     The winding shaft  2  illustrated also has a groove  23  by means of which it is possible to center a bearing bushing (not illustrated), which can be inserted into one end  21 ,  22  of the winding shaft  2 . 
     As can be seen in  FIG. 1   b , the flexible sheet-like structure  3  has two tabs  30 . In order to form the tabs  30  cuts  31  are cut into the flexible sheet-like structure  3  in the transverse direction Q at lateral peripheries  33 . The tabs  30  can be angled in each case about folding lines  32 , which run, as illustrated, parallel to a longitudinal direction L or at an angle thereto, in relation to that plane of the sheet-like structure  3  which coincides with the plane of the drawing. Angling of the tabs about the folding lines  32  is indicated by dashed lines in  FIG. 1   b.    
     The angled tabs  30 —as is illustrated in  FIG. 1   c —can be inserted into the slots  20  of the winding shaft  2 . The width B_S of the slots  20 , for this purpose, is greater than a thickness of the sheet-like structure  3  extending perpendicularly to the plane of the drawing according to  FIG. 1   b . The width B_S may be adapted to the stiffness of the flexible sheet-like structure  3  and thus to the deformability for insertion into the slot  20 . In one embodiment, the tabs  30  inserted may be adhesively bonded and/or clamped to the winding shaft  2  in the interior of the latter. For clamping of the sheet-like structure, use may be made for example, of bearing bushings (not illustrated) inserted into the ends  21 ,  22  of the winding shaft  2 . 
     In order that the tabs  30  according to  FIG. 1   b  can be plugged into the slots  20  of the winding shaft  2 , a length L_L of the tab  30  in the longitudinal direction, at most, is equal to the arc length L_S of the slot  20 . In other configurations which are not illustrated, however, it is also conceivable for tabs to project longitudinally beyond the sheet-like structure at an end edge, in which case a U-shaped end is produced. Production of such a sheet-like structure, however, results in waste remaining. A width B_L of the tab  30  preferably corresponds to the distance A_S of the slots  20  from the respective ends  21 ,  22 . In order to improve fastening of the flexible sheet-like structure  3  on the winding shaft  2 , in the exemplary embodiment illustrated an adhesive is applied to an underside of the sheet-like structure  3 , in a region of contact  35  with the winding shaft  2 . 
     In a variation of the first exemplary embodiment, a cutout  24  which extends up to the end  21  of the winding shaft  2  is introduced into the winding shaft  2 , as is indicated schematically by a dashed line. Using a cutout  24  instead of a slot  20  simplifies the insertion of the tab  30  into the interior of the winding shaft  2 . 
       FIG. 2   a  shows, schematically, a winding shaft  102  for a roller blind according to a second exemplary embodiment of the invention. Six slots  20  each extending with an arc length L_S in the circumferential direction, are introduced into the winding shaft  102 . In other configurations of the invention, more than six or fewer than six slots  20  can be made in the winding shaft  102 , for example by cutting into the winding shaft  102 . 
       FIG. 2   b  shows a flexible sheet-like structure  103  which can be fastened on the winding shaft  102  according to  FIG. 2   a . Six tabs  30 ,  130  are formed on the flexible sheet-like structure  103 . The two outer tabs  30  here are formed in each case by a cut  31  in the transverse direction Q of the flexible sheet-like structure  103  at the lateral peripheries  33 . For the central tabs  130 , in addition to the cuts  31  in the transverse direction Q, cuts  131  are cut into the flexible sheet-like structure  103  in the longitudinal direction L of the flexible sheet-like structure  103  from the end edge  34 . The tabs  30 ,  130  can be angled from the flexible sheet-like structure  103 . Angled tabs  30 ,  130  can be inserted into the slots  20  of the winding shaft  102  according to  FIG. 2   a , in which case the flexible sheet-like structure  103  can be connected to the winding shaft  102  in the interior of the latter. Fastening of the flexible sheet-like structure  103  on the winding shaft  102  can be improved by an adhesive layer or the like. In another configuration of the invention, the longitudinal cuts  131  are spaced apart from the end edge  34 . Using a further cut in the transverse direction means that a tab which can be angled at any desired angle can likewise be produced by three cuts arranged in U-shaped manner. 
       FIGS. 3   a  to  3   c  show a winding shaft  202  and a flexible sheet-like structure  203  for a roller blind  201  according to a third exemplary embodiment of the invention. The components here essentially correspond to the components according to  FIGS. 1   a  to  1   c , and like elements are indicated by like designations. For fastening the flexible sheet-like structure  203  on the winding shaft  202 , slots  220  are introduced into the ends  21 ,  22  of the winding shaft  202  in the axial direction of the winding shaft  202 . The slots  220  in the axial direction or axial grooves, have a length L_N. As can best be seen in  FIG. 3   b , tabs  230  are formed at the lateral peripheries  33  of the flexible sheet-like structure  203  at an end edge  34  which is to be fastened on the winding shaft  202 . The tabs  230  are formed by cuts  36  in the longitudinal direction L of the flexible sheet-like structure  203 , the cuts  36  illustrated terminating at the end edge  34  of the flexible sheet-like structure  203 . The tabs  230  have a width B_L and length L_L, the width B_L corresponding essentially to a length L_N of the axial slots  220  according to  FIG. 3   a . The tabs  230  can be angled from the flexible sheet-like structure  203  about folding lines  37  running parallel to the transverse direction Q, it being possible for the angled tabs  230 , as illustrated in  FIG. 3   c  to be inserted into the slots  220  and for the flexible sheet-like structure  203  to be fastened on the winding shaft  202  according to  FIG. 3   c  in order to produce the roller blind  201 . The tabs  230  inserted can be adhesively bonded, clamped or connected in some other manner to the winding shaft  202  in the interior of the latter. 
       FIGS. 4   a  to  4   c  show schematically, a winding shaft  302  and a flexible sheet-like structure  303  for a roller blind  301  according to a fourth exemplary embodiment of the invention. The components here correspond essentially to the components according to  FIGS. 3   a  to  3   c , and like elements are indicated by like designations. 
     In each case two slots  220  are formed in the axial direction at the ends  21 ,  22  of the winding shaft  302  according to  FIGS. 4   a  and  4   c , the axial slots  220  each having the length L_N. A respective nose  25  is formed at each end  21 ,  22  by the slots  220 . In order to fasten the flexible sheet-like structure.  303  according to  FIGS. 4   b  and  4   c  on the winding shaft  302 , tabs  330  with a length L_L and a width B_L are formed in the flexible sheet-like structure  303 . The tabs  330  are formed in each case by a cut  336  in the longitudinal direction L parallel to the lateral peripheries  33 , and at a distance B_L therefrom. Deformation of the flexible sheet-like structure  303  means that the tabs  330  can be angled about folding lines  38 , parallel to the transverse direction Q, from a plane of the flexible sheet-like structure  303  which coincides with the plane of the drawing according to  FIG. 3   b . For fastening the flexible sheet-like structure  303  on the winding shaft  302 , as is illustrated in  FIG. 4   c , the angled tabs  330  can be pushed into the axial slots  220  beneath the nose  25 . For fastening at the two ends here, use can be made for example, of elasticity of the flexible sheet-like structure  303  and/or deformability of the noses  25 . In other configurations, such fastening is provided only at one of the ends  21 ,  22  of the winding shaft  402 . 
       FIGS. 5   a  and  5   b  show a winding shaft  402  and the flexible sheet-like structure  303  according to  FIG. 4   b  for a roller blind  401  according to a fifth exemplary embodiment of the invention. The exemplary embodiment corresponds essentially to the exemplary embodiment according to  FIGS. 4   a  to  4   c , and like elements are indicated by like designations. 
     As can be seen in  FIGS. 5   a  and  5   b , in each case four slots  220  are formed at the ends  21 ,  22  of the winding shaft  402 , each slot extending in the axial direction of the winding shaft  402  and having a length L_N. The four slots  220  result in three noses  25  being formed at each of the ends. A flexible sheet-like structure  303  according to  FIG. 4   b  can be fastened on the winding shaft  402 , as is illustrated in  FIG. 5   b , the tab  330  being intertwined with the noses  25  of the winding shaft  402 , as is illustrated in  FIG. 5   b . In order to provide for a fastening of the flexible sheet-like structure  303  at the two ends  21 ,  22  of the winding shaft  402 , it is likewise possible to make use of elasticity of the flexible sheet-like structure  303 . In other configurations of the invention, the various fastening methods are combined with one another and/or the flexible sheet-like structure is intertwined with the winding shaft just at one lateral periphery. 
       FIG. 6   a  shows a winding shaft  502  for a roller blind according to a sixth exemplary embodiment of the invention. Elements of the winding shaft  502  which correspond to the winding shaft  2  according to  FIG. 1   a  are indicated by like designations, and a detailed description of these elements is dispensed with. The winding shaft  502  illustrated has an essentially U-shaped aperture  520 , which forms a first nose  521 , and an essentially V-shaped aperture  524 , which forms a further nose  525 . The apertures  520 ,  524  illustrated are merely by way of example. It is, of course, likewise conceivable to have winding shafts which have two or more U-shaped apertures  520  and/or two or more V-shaped apertures  524  and/or modifications thereof. It is also conceivable to have winding shafts which have just one U-shaped or V-shaped aperture, although two or more apertures which are spaced apart from one another in the axial direction of the winding shaft are advantageous for better rotation prevention. The apertures  520 ,  524  can be introduced into the tubular winding shaft  502  at any desired distance A_U from the ends  21 ,  22  of the same. 
       FIG. 6   b  shows a flexible sheet-like structure  503  with tabs  530 ,  534  by means of which the flexible sheet-like structure  503  can be fastened on the winding shaft  502  according to  FIG. 6   a . In the exemplary embodiment illustrated, a first tab  530  is formed by two slots  531  running in the transverse direction Q. The nose  521  of the winding shaft  502  illustrated in  FIG. 6   a  can be guided through the slots  531  when the flexible sheet-like structure  503  is fitted on the winding shaft  502 , in which case the tab  530  is inserted into the aperture  520 . An edge of the nose  521  here ends up located beneath the flexible sheet-like structure  503 . Even when the sheet-like structure is unwound to the full extent, the edge thus does not project, and this does away with the risk of injury and/or the risk of damage. It is likewise conceivable for a tab for the aperture  520  to be formed by just one slot  531 , the edge of the nose  521  ending up located above the corresponding region of the flexible sheet-like structure. It should be noted that there is also minimal risk of injury here on account of the conventional arrangement of a winding shaft. Such a tab  534  is illustrated schematically in  FIG. 6   b  for connection to the nose  525  according to  FIG. 6   a . The tab  534  is formed by just one slot  531  in the transverse direction Q. The nose  525  ends up located above the flexible sheet-like structure  503 , in which case the flexible sheet-like structure  503  is fastened on the winding shaft  502  according to  FIG. 6   a . It would, of course, also be conceivable for flexible sheet-like structures  503  to be fastened conversely on the winding shaft  502 , the nose  525  being inserted into two slots  531 . The apertures  520 ,  524  and the corresponding tabs  530 ,  531  secure the flexible sheet-like structure  503  on the winding shaft  502  against being pulled off in one direction. In other configurations, the apertures  520 ,  524  may be arranged in opposite directions for a securing action in both directions. 
       FIG. 7  shows an exploded illustration of an end region of a winding shaft  602  and of a flexible sheet-like structure  603  as well as a bearing bushing  604  for a roller blind  601  according to a seventh exemplary embodiment of the invention. The winding shaft  602  has an aperture  624  at its end  621 . In order to produce a tab  630 , a corner of the flexible sheet-like structure  603  has been folded over. The tab  630  can be inserted into the aperture  624  of the winding shaft  602  and fixed there by way of the bushing  604 . The aperture  624 , for this purpose, has an oblique flank, of which the angle corresponds essentially to a folding angle for folding the tab  630 . 
     The winding shaft  602  has a groove  623  by means of which the bearing bushing  604  can be connected to the winding shaft  602  in a rotationally fixed manner when it is inserted into the end  621  of the winding shaft  602 . In the exemplary embodiment illustrated, the aperture  624  follows the groove  623  directly in the circumferential direction. A tongue  640  and a latching nose  641  are formed on the bearing bushing  604  and are introduced into the groove  623  and the aperture  624 , respectively. The tongue  640  here serves for connecting the bearing bushing  604  to the winding shaft  602  in a rotationally fixed manner. The latching nose  641  serves for clamping the flexible sheet-like structure  603  on the winding shaft  602 . 
       FIG. 8  shows an exploded illustration of part of a winding shaft  702  and of a flexible sheet-like structure  703  and also a bearing bushing  704  of a roller blind  701  according to an eighth exemplary embodiment. The flexible sheet-like structure  703  has a through-passage  731  extending in a longitudinal direction L and, in the exemplary embodiment illustrated, the through-passage  731  is configured essentially as a cut in the longitudinal direction L, the intention being for tearing to be prevented by circular widening at the ends of the cut. The flexible sheet-like structure  703  corresponds essentially to the sheet-like structure  303  according to  FIG. 4   b . As with this sheet-like structure  303 , it is also the case here that, between the through-passage  731  and a lateral periphery  733  of the flexible sheet-like structure  703 , a tab  730  can be angled about folding lines  738  in relation to the plane of the sheet-like structure  703 . The tab  730  can be inserted into a complementary aperture  724  of the winding shaft  702 . For fixing the tab  730  in the aperture  724 , in the exemplary embodiment according to  FIG. 8 , the bearing bushing  704  is provided with a latching nose  741  which, when the bearing bushing  704  is pushed into the end  721  of the winding shaft  702 , is pushed over the tab  730  inserted into the aperture  724 . In other words, the latching nose  704  and the flexible sheet-like structure are “intertwined” with one another. The flexible sheet-like structure  703  is thus clamped to the winding shaft  702 . An aperture  724  and tab  730  may be provided correspondingly at the opposite end (not illustrated) of the winding shaft  702  and of the flexible sheet-like structure  703 . In order to connect the bearing bushing  704  to the winding shaft  702  in a rotationally fixed manner, a groove  723  is provided on the winding shaft  702  and a complementary tongue  740  is provided on the bearing bushing  704 . 
     Of course, although only flexible sheet-like structures with a rectangular basic shape have been illustrated, other shapes, for example a trapezoidal shape or the like, are also conceivable. According to the invention, it is also possible, in the case of these shapes, for tabs to be formed in the basic flexible sheet-like structure, using corresponding cuts without any (additional) waste. 
     Furthermore, it is conceivable to produce cuts at any desired angle in order to form the tab in a sheet-like structure, an associated winding shaft having correspondingly angled slots. 
     The cuts may be formed, at their ends, with transverse slots which prevent the flexible sheet-like structure from tearing beyond the cut. 
     The cuts can be produced in canvases or similar sheet-like structures using knives, scissors or the like. It is also conceivable for the “cuts” to have already been provided in woven and/or plaited or braided sheet-like structures during production, it being possible for the cuts to have corresponding borders which prevent undesired tearing.