EP1165927B1 - Drive device for a roller shutter door - Google Patents

Description

The invention relates to a roller shutter drive device of the type specified in the preamble of claim 1, as out BE 783 837 is known.

Roller shutters of the type in question have been known for a long time, they are used in particular for the closure of gate openings or the like used in those indoors behind the lintel that delimits the door opening upwards, there is enough space for the arrangement there is a winding shaft on which the door leaf in the form of articulated in the winding direction interconnected rods, also lattice members or the like in the course of the opening movement is wound up and unwound in the course of the closing movement. The one in this Have articulated successively connected elements to form the door leaf depending on the version, a thickness that should not be undercut - especially during training temperature-insulating and / or burglar-resistant type, which is why in the course of Opening process around the winding shaft forming coils correspondingly large changes in diameter caused. Because the door leaf - often called a tank here - is on the train the closing movement must be initiated in side guides is a low-friction as possible and gentle insertion of the door leaf links into the guides only possible if in the insertion area of the vertical guides, if possible in the same direction are fed. For this it is necessary to move the axis of the winding shaft in - as synchronously as possible - Adaptation to the radius of the outermost layer of the wound door leaf members to be displaced in such a way that the part of the door leaf members running off the winding can enter the guides as vertically as possible. These problems and solutions for this are known in the prior art. According to this state of the art, it is before also known to all, directed towards the fall or away from it To derive synchronously the amount of movement from the rotation drive of the winding roller is it that the drive movement is initiated by hand - chain drive - or motor.

Basically, it is assumed that the for the distance adjustment the winding shaft against the fall of the door opening to be closed Displacement of the winding shaft bearing blocks along from both sides of the door opening Consoles happen that have a sliding or rolling plane for this adjustment movement exhibit. Such sliding guides are prone to dirt and corrosion overall require extensive maintenance. They are also subject to friction and usually cause certain operating noises.

A roller shutter drive device of the type mentioned in the preamble of claim 1 is known from BE 783.837. The known roller shutter drive device has on both sides of the wrapping bale, which is rolled up onto the wrapping shaft Roller shutter curtain consists of only one four-link chain consisting of four levers. On longer lever of the four-link chain is articulated on its upper end Winding shaft and is at its lower end via a short lever on one wall-fixed console kept adjustable in height. At the middle of this longer lever is a half-length lever that strives upwards its other end is articulated to the console. In the state of Technology, the winding shaft of the roller shutter is moved on a circular path. this leads to to the fact that the rolled up armored vehicle is raised in the course of the rolling process must become.

Four-link chains are basically known as gear means and in configurable in many ways. The peculiarity of using such Four-link chains for the adjustment movement of the winding shaft axis opposite The fall of the door opening to be closed is due to the fact that the primarily taking place pivoting movement of the adjusting device structurally simple way only very low friction losses can be achieved, this in contrast to the previous solutions, which go further are much more susceptible to contamination.

Based on the state of the art according to BE 783.837, it is the task of Invention, the advantages of four-link chain guidance, namely the reliable, Low-noise and low-maintenance as well as operable with low friction losses Retain shift guidance and still have the disadvantages mentioned above to avoid this state of the art.

This task is performed by a roller shutter drive device with the features of attached claim 1 solved.

The term "door leaf" also includes a tank, a rolling grille or to understand the like.

The inventive construction of two in the direction of adjustment consecutively arranged four-link chains, the axis of rotation in an im essentially rectilinear direction.

Advantageous embodiments of the invention are the subject of the dependent claims.

In the Tecknik stand, only one four-link chain is provided per console or side of the door leaf. Basically, the bearing of the winding shaft axis from the console is the one forms a fixed chain link, by two articulated levers or comparable Coupling devices connected to the console in such a way that the Chain link bearing the winding shaft axis in its entirety compared to the console can be moved. A more precise guidance is achieved according to the invention in that at least two in the direction of adjustment per lateral guide or console consecutively arranged four-link chains are provided, the to which Console articulated and displaceably coupled chain links with the storage pivotally connected.

In a preferred embodiment, those are formed by lever arrangements Four-link chains designed such that each lever arrangement has one arm Articulated lever and a two-armed lever about twice as long, approximately in whose middle region is articulated on one end of the one-armed articulated lever, the other end with the associated console or the associated storage via one Swivel bearing is connected that the two-armed lever on its Swivel bearing of the one-armed opposite end either approximately perpendicular to Adjustment direction of the winding shaft axis guided or by means of another one-armed lever is pivotally connected to the console and equally like the swivel bearing of the one-armed lever on the console or the bearing is articulated and that the other, the pivot bearing of the one-armed lever in Adjustment direction of the winding shaft axis seen adjacent end of the two-armed Lever on each other towards each other in the course of the adjustment movement moving parts - storage or console - is articulated, the Swivel bearing of the one-armed lever with the one arranged in the same part Shifting the end of the two-armed lever facing away from the one-armed lever Lever approximately on the line of alignment of this sliding guide or adjacent to it is located so that the bearings towards the consoles in the course of Distance adjustment a rectilinear or more or less arcuate describe different trajectory. In a preferred embodiment, the Lever arrangement or the lever arrangements at least on one side of the Gate opening between the console or between the console and this or these assigned aprons provided on the trestle of the associated storage are formed and corresponding approximately in a vertical plane parallel to the aligned sides of the console and in particular the holder of a the winding shaft is used via an electric gear motor driving the traction mechanism. Between the one-armed lever and the other part of the in the course of Adjustment movement of mutually displaceable parts - console and apron - articulated arm section of the two-armed lever is in the end positions of the Adjustment movement preferably an angle of less than 90 °, in particular approximately 25 °, locked in. In particular, in the course of the support between the console and Apron the one-armed lever is under tension and that between the articulation of the one-armed lever and the two-armed lever and its linkage to each other part - console / apron - extending arm section of the two-armed Lever under pressure. On the other hand, in the course of supporting the apron on the The one-armed lever is pressurized and the bracket between the articulation of the one-armed lever on the two-armed lever and its linkage to each other part - console / apron - extending arm section of the two-armed Be lever-loaded.

In another preferred embodiment, at least one is in the direction of adjustment successive lever arrangements another in the axial direction of the linkages spaced equally designed lever arrangement associated with the same respective axes are operatively connected to one another in rotation. It can be advantageous the axis connection between the articulation points of the one-armed lever and the two-armed lever of the same-axis parallel lever arrangements provided a circular arc around the other end of the one-armed lever Recesses running pivot bearings.

In another particularly preferred embodiment, the direction of the distance adjustment is falling from the horizontal to the lintel of the gate opening to be closed trained, from small angles of decline up to 45 °.

The four-link chains provided according to the invention allow a strict rectilinear movement distance of the winding shaft axis in the course of Distance adjustment, depending on the lever dimensions and / or guidance, can however also achieve a slightly arcuate course of the movement path, this Course is then arched towards the floor, so that the course the winding of the door leaf for the distance adjustment on the winding shaft equalized force to be applied. It can be preferred at the beginning of the Opening movement distance of the distance adjustment of the winding shaft one to the ground towards the given path of movement, so that the effort for the Distance adjustment with door leaf still predominantly processed correspondingly smaller is.

In a further preferred embodiment, a locking device is for assembly purposes provided, especially one for mounting the bearings or aprons in Near the lintel and / or one substantially removed from the lintel for mounting the fully wound winding shaft. Furthermore, for the purpose of noise reduction at least part of the articulation points of the four-link chains by means of a rubber metal element or the like may be axially damped.

The distance adjustment in question between the winding shaft axis and the Fall for the purpose of unimpeded insertion of the roller shutter leaf in the displacement guides attached to the side of the gate opening is preferred by a Adjusting device in the manner of a differential block and tackle causes such that the Drive of the adjustment movement is derived from the winding shaft drive, so that the Synchronization between the winding and unwinding movement of the roller shutter door curtain, grille or curtain on the one hand and the adjustment movement of the winding shaft axis in relation on the fall of the door opening to be closed on the other hand is inevitable. The Using a differential block and tackle in this context stands out in that the classic "load bottle" is the driving element here. In particular, this adjustment device comprises two fixed, rotatably mounted, mutually non-rotatably connected winding bodies, one of which has a larger opening and opening Has unwinding diameter than the other, and that a continuous Traction device, which both on one and on the other winding body up and can be developed by a torsion-proof on the driven winding shaft axis arranged gear wheel depending on the gear shaft drive movement is driven. The winding bodies are preferably circular cylindrical Shell surfaces equipped, each of which is helical in the axial direction reproducing receiving groove for the traction means.

Basically, such an adjustment device can be designed to be friction-locked, however slip phenomena lead to increasing errors, which is why in particularly preferred Execution of the engagement between the traction means, the drive wheel and the winding body in Direction of traction is form-fitting. For this, the traction device can be used as a flexible strand in the manner of a toothing, successively equally spaced bulges be formed to which the drive wheel and the winding body are adapted are.

From the point of view of a space-saving construction possible in the case of wound door leaf the distance between the winding body and the drive wheel become relatively small on the winding shaft axis. Because of the traction mechanism between the drive wheel and the two bobbins are either lateral Dislocations or rotations of 90 ° when viewed in the direction of the strand are required - see Embodiment - which in a preferred embodiment to form the traction device as very narrow belt or straight as a rope to which bulges are preferred Plastic are injection molded, in particular in such a way that the plastic of the tooth-shaped bulges form-fitting through the strand or the rope.

Figur 1

einen schematisierten Querschnitt durch Toröffnung und Sturz mit einer in Achsrichtung der Wickelwelle gesehenen Seitenansicht auf die betroffene Konsole und zugehörigem Lagerbock nebst Schürze der Wickelwelle;

Figur 2

einen Querschnitt entsprechend Figur 1 in der zum Sturz hin gerichteten Abstandsverstellungsendlage der Wickelwelle;

Figur 3

eine senkrecht zu den Figuren 1 und 2 verlaufende Seitenansicht in parallel zur Toröffnung verlaufender Ebene eines axialen Endbereichs der Wickelwelle mit zugeordnetem Lagerbock und Konsole bei Einsatz achsparalleler Hebelanordnungen;

Figur 4

eine Variante zu der Ausführung gemäß den Figuren 1 bis 3;

Figur 5

eine Prinzipdarstellung zur Verdeutlichung der Viergelenkketten-Ausbildung der Führungen nach den Figuren 1 bis 4;

Figur 6

eine perspektivische Ansicht des antriebsseitigen axialen Endbereiches einer Wickelwelle mit einer Verstelleinrichtung auf der Basis eines Differenzialflaschenzugs;

Figuren 7, 8 und 9

verschiedene Ansichten zur Erläuterung der Verstelleinrichtung auf der Basis des Differenzialflaschenzugs.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing; show it:

Figure 1

a schematic cross section through the gate opening and lintel with a side view seen in the axial direction of the winding shaft on the affected console and associated bearing block together with apron of the winding shaft;

Figure 2

a cross section corresponding to Figure 1 in the lintel towards the camber end position of the winding shaft;

Figure 3

a side view perpendicular to Figures 1 and 2 in parallel to the gate opening plane of an axial end portion of the winding shaft with associated bearing block and bracket when using axially parallel lever arrangements;

Figure 4

a variant of the embodiment according to Figures 1 to 3;

Figure 5

a schematic diagram to illustrate the four-link chain design of the guides according to Figures 1 to 4;

Figure 6

a perspective view of the drive-side axial end region of a winding shaft with an adjusting device based on a differential block and tackle;

Figures 7, 8 and 9

different views to explain the adjustment device based on the differential block and tackle.

FIG. 1 schematically shows the lintel 2 of a building wall above a gate opening 1, that of a door leaf, not shown, in the form of a roller door curtain, a roller door grille, a roller blind or the like is to be optionally closed and opened. The For this purpose, the door leaf is guided on the edges in guides 3 arranged on both sides of the door opening, as is known from the genus for these gates. For the introduction of the door leaf in the guides 3 depending on the extent of the wound on the winding shaft 5 Bale 4, it is known that the winding shaft 5 to fall 2 of the to be closed Move the door opening 1 so that the door leaf is as vertical as possible in the guides 3 enters. For this purpose, the winding shaft 5 or its axis 6 can fall move downwards, because with decreasing angular diameter, the one starting from the winding Tangential line gets closer and closer to the guides. Such an inclination Adjustment movement of the winding shaft axis falling towards the camber can be up to 45 ° include.

The winding shaft 5 or winding shaft axis 6 is held in a bearing block 7 to which one Apron 8 is firmly connected, which - Figure 3 - on both sides of the lever assemblies 12, 13; 12 ', 13' extends, which form a four-link chain lever arrangement as closer will be explained. The apron 8 bears the overall number 9 Winding shaft drive, an electric gear motor and one in Figures 1 to 3 not includes traction means transmission 22, via which the electric gear motor 9 the winding shaft 5 works - Figure 8 -.

Within the scope of the exemplary embodiment according to FIGS. 1 to 3, axial side region of the door leaf two in the direction of adjustment of the axis 6 relative to the Fall 2 successive four-link chain devices 12 and 13 provided that - Figure 3 - according to the illustrated embodiment on both sides of a console wall 10th arranged and connected to each other in the same way.

In this embodiment, the four-link chain comprises a one-armed lever 14 or 14 'and a two-armed lever 15 or 15', the one-armed lever at 17 on the Console is articulated and at 16 approximately in the central region of the two-armed lever 15 hingedly connected to this. That the pivot point 17 in the vertical direction opposite end of the two-armed lever 15 is at 20 approximately vertically displaceable on the Console 10 out and is with its other end 19 - on one of the four-link chain derived lever arm section 21 - on the bearing block 7 or here in the case of this subsequent apron articulated. To synchronize the two Lever systems 12, 13 and 12 ', 13' on both sides of the console wall 10 are Rotary bearings of the two levers 14 and 15 and 14 'and 15' on the Articulated connecting bolts 16 and 18 connected, the former 16 in passage through one circular recess 22 in the console wall 10 and the latter through the Slot guide, also in the console wall 10.

Figures 1 and 2 show the two end positions of the winding shaft 5 relative to the Fall 2 once - Figure 1 - with the gate open and thus fully wound winding shaft and on the other hand, in Figure 2, the closest position of the winding shaft 5 or its axis 6 to Lintel 2 and thus due to the door leaf being unwound in the closed position of the door. The resulting displacement movements between each of these two end positions lever assemblies 12 and 13 or 12 'and 13' forming a four-link chain result understandable for the specialist, of course. Figure 3 shows the arrangement according to the Figures 1 and 2 seen perpendicular to the winding shaft axis 6 and the gate opening 1 such that the lever arrangements 14 and 15 on both sides of the console wall 10 are provided, which are interconnected. The other end of the winding shaft is the Arrangements 12, 13 and 12 ', 13' are present again.

To clarify that within the scope of the exemplary embodiment according to FIGS. 1 to 3 made use of a four-link chain with regard to the lever arrangements 14, 15, 20 4 shows an arrangement according to FIGS. 1 and 2, which instead of the elongated hole displacement guide 20 works with a further articulated lever 20 '. It is straightforward clear that the elongated hole guide 20 is only the tracing of the movement of the Building opposite end of the lever 20 'describes if one in view of the short distances, the linear guide 20 of the movement of the freely displaceable end the lever 20 'equates.

It is thus readily understandable that the exemplary embodiment according to FIGS. 1 to 3 makes use of a four-link chain, as shown schematically in FIG. 5, using the joints I to IV is shown. The link chain link IV is stationary, so it corresponds to the console with any other stationary on the edge of the wall to be closed Parts held gate opening, while II is a chain link that is displaceable compared to IV and is articulated towards it.

FIG. 6 shows a perspective view of the drive-side axial end of the winding shaft 5, in which aprons 8 are subsequently formed on the bearing 7 Include lever assemblies 12, 13 and 12 ', 13' on the outside. On the aprons 8, the one Form unit, the electric gear motor 9 is held, which via a belt drive 22nd (Traction means) is connected to the winding shaft 5 by gear. On axis 6 of the winding shaft 5, a gear wheel 32 is arranged in a rotationally fixed manner, by way of which it is not shown in detail a gear train 33 is positively driven. The gear train 33 becomes one End on a cylindrical bobbin 34 of larger diameter and a second In contrast, the winding body has a smaller diameter and is unwound. The two Winding bodies can be rotated with respect to one another on a stationary axle stored so that when winding on the winding body 34 of larger diameter simultaneous unwinding from the winding body of smaller diameter a reduction the distance between the fixed mounting of the winding body and the winding shaft results in such a way that the distance of the winding shaft axis 6 from the camber 2 is enlarged as required by increasing bale formation when the gate is opened is. Conversely, when the gate closes and thus becomes smaller Bale diameter through appropriate drive direction of the gear wheel Gear train 33 from the winding body 34 of larger diameter and on the Coil of smaller diameter wound up.

As can be seen from the drawing, in the exemplary embodiment shown is Gear train 33 subjected to an entanglement by 90 °. Would you be the winding body 34 and 35 with respect to their axis of rotation 36 by 90 °, so the casserole of the Gear train 33 take place without entanglement, but it would be one from the radial plane given the gear wheel 32 different deviating strand profile. For this Basically, there is a need for a gear train 33 that is possible Deviations from the upward and downward direction and / or entanglements if possible is insensitive. It is only a relatively narrow strap or better Another rope is considered, in which the for the slip-free transmission of motion required tooth-shaped bulges are formed encompassing all around. In preferred embodiment, a textile narrow band or a rope is used on which tooth-shaped bulges made of plastic penetrating cavities in the Band or rope are fixed so that they cannot move. Figures 7 to 9 show the Guide relationships for the transmission train based on that shown in Figure 6 Embodiment, the winding body 34 and 35 of different diameters are formed with a cylindrical outer surface, each of which is located in the axial direction helically reproducing receiving grooves for the gear train 33 are provided.

Claims (22)

1. Roller door drive mechanism having a distance adjustment for adjusting the distance of a rotation axis (6) of a winding shaft (5) which receives the door leaf from a lintel (2) of a door aperture (1) or the like which is to be closed off, dependent on a closed or open position reached by the door leaf for the entry/exit alignment thereof on guides (3) provided for the door leaf laterally of the door aperture (1), the distance adjustment being at least substantially synchronised with a closing and opening movement of the door leaf and the distance adjustment of the rotation axis (6) of the winding shaft (5) being carried out by the guiding of mounts for the winding shaft (5) relative to associated brackets (10) which are to be provided either side of the door aperture (1) in the lintel region, while
   a guide for the mounts relative to the brackets (10) for each mount and
   associated bracket (10) comprises a four-bar chain (1 to 4) in the form of a lever arrangement (12, 13), having a chain link (15) jointed (17) to the bracket (10) and displaceably (18, 20) coupled thereto, to which the mounting (7) is jointed,
   characterised in that the guide is a substantially straight guide which guides the mounts (7) relative to the brackets (10) along an at least approximately straight travel path and is formed, for each mount and associated bracket (10), by at least two of the lever arrangements (12, 13) forming the four-bar chains which are provided in succession in the direction of adjustment.
2. Roller door drive mechanism according to claim 1, characterised in that each lever arrangement (12, 13) comprises a first one-armed toggle joint (14) and a two-armed lever (15) which is approximately twice as long, one end of the one-armed toggle joint (14) being attached thereto substantially in the central region thereof, the other end being connected to the associated bracket (10) or the associated mount (7) via a swivel mount (17), in that the two-armed lever (15) is either guided to be movable at its end (18) remote from the swivel mount (17) of the one-armed toggle joint (14), substantially perpendicularly to the direction of movement of the winding shaft axis (6), or is pivotably connected to the bracket (10) by a second one-armed lever (20') and in the same way as the swivel mount (17) of the first one-armed toggle lever (14) is jointed to the bracket (10) or mount, and in that the other end (19) of the two-armed lever (15) adjacent to the swivel mount (17) of the first one-armed toggle lever (14), viewed in the direction of movement of the winding shaft axis (6), is jointed to the other one of the parts which are to be moved relative to each other in the course of the adjusting movement, i.e. the bearing (7) or bracket (10), while the swivel mount (17) of the first one-armed toggle lever (14) with the displacement guide (20), arranged in the same part (10), for the end (18) of the two-armed lever (15) remote from the first one-armed toggle lever (14), is disposed substantially in alignment with this displacement guide (20) or adjacent thereto, so that the mounts describe a substantially straight path of movement relative to the brackets (10) in the course of the distance adjustment.
3. Roller door drive mechanism according to one of claims 1 or 2, characterised in that the lever arrangements (12, 13) are provided, on at least one side of the door aperture (1), between the bracket (10) and the associated lintels (8), which are formed on a bearing block (7) of the associated mounts and extend in a substantially vertical plane parallel to the correspondingly aligned sides of the bracket (10), and which serves in particular to mount a geared electric motor (9) which drives the winding shaft (5) by means of a traction gear (11).
4. Roller door drive mechanism according to claim 2 or 3, characterised in that in the end positions of the adjusting movement an angle of less than 90°, more particularly about 25°, is enclosed between the first one-armed toggle lever (14) and the arm portion (21) of the two-armed lever (15) which is jointed to the other part (8) of the parts which are movable relative to one another in the course of the adjusting movement, i.e. the bracket (10) and lintel (8).
5. Roller door drive mechanism according to one of claims 2 to 4, characterised in that when there is a bearing force between the bracket (10) and lintel (8) the first one-armed toggle lever (14) is subjected to tensile stress and the arm portion (21) of the two-armed lever (15) which extends between the point of attachment (16) of the first one-armed toggle lever (14) and the two-armed lever (15) and its point of attachment (19) to the other part (8) - namely the bracket (10) or lintel (8) - is subjected to compressive stress.
6. Roller door drive mechanism according to one of claims 2 to 4, characterised in that when the lintel is being supported on the bracket the first one-armed toggle lever is subjected to compressive stress and the arm portion of the two-armed lever which extends between the point of attachment of the first one-armed toggle lever on the two-armed lever (15) and its point of attachment (19) to the other part - bracket or lintel - is subjected to tensile stress.
7. Roller door drive mechanism according to one of claims 1 to 6, characterised in that associated with at least one of the lever arrangements (12, 13) arranged in succession in the direction of adjustment there is another lever arrangement (12', 13') of similar construction at a spacing in the axial direction of the points of attachment (16-18), said lever arrangements being operatively connected and rotating about the same common axes.
8. Roller door drive mechanism according to one of claims 2 to 7, characterised in that an axial connection between the points of attachment (16) of the first one-armed toggle levers (14) and the two armed levers (15) of the coaxial parallel lever arrangements (12, 12', 13, 13') is guided through cutouts (22) extending in an arc of a circle about swivel mounts (17) which are provided at the other end of the first one-armed toggle levers (14).
9. Roller door drive mechanism according to one of claims 1 to 8, characterised in that the direction of the spacing adjustment, viewed from the horizontal to the lintel (2) of the door aperture (1) which is to be closed off, is designed to fall at up to 45°.
10. Roller door drive mechanism according to one of claims 1 to 9, characterised in that instead of a strictly linear travel of the spacing adjustment of the rotation axis of the winding shaft this travel is designed to be downwardly convex by corresponding dimensioning and/or guiding of the levers in order to equalise the force to be exerted on the winding shaft in the course of rolling up the door leaf for the distance adjustment.
11. Roller door drive mechanism according to one of claims 1 to 10, characterised in that at the start of an opening movement of the distance adjustment of the winding shaft there is some downwardly directed travel in order to reduce the application of force for the distance adjustment while the door leaf is still predominantly unwound.
12. Roller door drive mechanism according to one of claims 1 to 11, characterised in that a locking device is provided for installation purposes, particularly a locking device for the installation of the mounts or pelmets (8) in the vicinity of the lintel, and/or a locking device substantially remote from the lintel for the installation of the fully wound winding shaft.
13. Roller door drive mechanism according to one of claims 1 to 12, characterised in that at least part of the articulation points of the four-bar chains is made springy by the use of antivibration mounts or the like.
14. Roller door drive mechanism according to one of claims 1 to 12, characterised in that the adjustment device provided for adjusting the winding shaft axis (6) relative to the lintel (2) of the door aperture (1) which is to be closed off is constructed in the manner of a differential pulley so that automatically there is synchronisation between the winding and unwinding movement of the roller door armour, mesh or curtain, on the one hand, and the adjusting movement of the winding shaft axis in relation to the lintel of the door aperture which is to be closed off, on the other hand.
15. Roller door drive mechanism according to one of claims 1 to 12, characterised in that the adjusting device comprises two winding members (34, 35) rotatably mounted in a fixed location and non-rotatable relative to one another, one of which has a greater winding and unwinding diameter than the other, and in that a continuous tensioning means (33) which can be wound and unwound on both one and on the other winding member (34 or 35) is driven by a geared wheel (32) non-rotationally mounted on the driven winding shaft axis (6) as a function of the drive movement of the geared shaft.
16. Roller door drive mechanism according to claim 15, characterised in that the winding members (34, 35) comprise circular-cylindrical outer surfaces each of which has an accommodating groove for the tensioning means (33) running helically in the axial direction.
17. Roller door drive mechanism according to one of claims 15 or 16, characterised in that the engagement between the tensioning means, the geared wheel and the winding members is of an interlocking nature in the direction of pulling.
18. Roller door drive mechanism according to claim 17, characterised in that the tensioning means is constructed as a flexible strip with a succession of equidistant projections in the manner of teeth, which the drive wheel and the winding members are adapted to fit.
19. Roller door drive mechanism according to claim 18, characterised in that the projections are made of plastics injection moulded onto the strip.
20. Roller door drive mechanism according to one of claims 17 to 19, characterised in that the strip is constructed in the manner of a rope.
21. Roller door drive mechanism according to one of claims 19 or 20, characterised in that the tooth-like projections formed from plastics penetrate through openings provided in the strip.
22. Roller door drive mechanism according to one of claims 1 to 21, characterised in that the gear string (33) between the geared wheel (32) and the winding members (34, 35) is guided in an interwoven fashion.

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