WO2001077478A1 - Device for driving a belt - Google Patents

Abstract

The invention relates to a device for driving a belt for a roller shutter. Said belt is arranged on a rotationally mounted pulley which is sunk in a recess of a wall and which is prestressed in the winding-up direction by spring means. The device comprises a housing in which the belt is partially guided, a housing base plate which can be mounted on the wall and which has a transversal recess through which the belt is guided crosswise to the wall; at least two axially parallel friction rollers on whose peripheral surfaces the belt lies partially, respectively, at least two spur gears which are connected to the corresponding friction rollers in a rotationally fixed manner and are positioned coaxially to the same, respectively; and a drive motor, which is functionally connected to the spur gears. The belt (1) is relayed around at least two friction rollers (2, 3, 26, 27) which rotate in the same direction, at least two friction rollers (2, 3, 26, 27) being coupled by an axially parallel, offset spur gear (6, 28). At least one deflecting roller (10, 11, 29, 30, 31) is associated with the friction rollers (2, 3, 26, 27) on a side of said friction rollers that faces towards the wall (8), in such a way that the belt (1) leaves the friction rollers (2, 3, 26, 27) when extended parallel to the wall (8) and a section of the belt (1) which lies at the front in the winding-up direction is then deflected and guided essentially perpendicularly to the recess (9) of the wall (8).

Description

 Device for driving a belt

The invention relates to a device for driving a

Belt for a roller shutter, the belt being arranged on a disc which is countersunk in a recess in a wall and rotatably mounted, the disc being spring-biased in the winding direction of the belt, with a housing in which the belt is partially guided, with a the wall-mountable base plate of the housing, which has a transverse recess through which the belt is guided transversely to the wall, with at least two friction rollers arranged axially parallel, on the circumferential surfaces of which the belt rests in regions, with at least two each rotatably connected to the corresponding friction rollers and arranged coaxially to the same spur gears and with a drive motor that is operatively connected to the spur gears.

From EP 0860 579 A2 a device for driving a belt for a roller shutter is known, in which the belt is rotatably mounted on a disc, which is positioned in a recess of a wall. An electric drive motor is provided for raising and lowering the roller shutter, the drive shaft of which engages with a first spur gear. The first spur gear is in engagement with a further second spur gear arranged at a greater distance from the wall. The two spur gears are each rotatably connected with axially protruding friction tubes that serve as a support surface for the belt. In conjunction with a deflection roller arranged offset on the side facing the drive motor, the belt is guided around the rollers in a meandering manner, the friction roller assigned to the second spur gear being positioned such that the belt can run perpendicular to the wall into the recess in the wall , Due to this right-angled orientation of the area of the belt extending from the recess, a braking device can be put out of operation, which usually acts against the winding direction of the spring-tensioned belt in the case of manually operated roller shutters.

A disadvantage of the known device is that, in order to subsequently install the device, it is necessary to remove a friction roller from the housing so that the belt can be placed on the friction rollers with a changing direction of wrapping. The assembly of the device is therefore relatively complex. Another disadvantage of the known device is that the mounting location thereof is determined on the basis of the predetermined positioning of the friction roller assigned to the second spur gear. An adaptation to the local conditions is therefore not easily possible. It is therefore an object of the present invention to develop a device for driving a belt for a roller shutter in such a way that, on the one hand, the assembly effort is reduced and, on the other hand, reliable guidance of the belt is ensured.

To solve this problem, the invention in connection with the preamble of claim 1 is characterized in that the belt is folded around at least two co-rotating friction tubes, at least two friction tubes being coupled via a spur gear arranged offset parallel to the axis, and that on one of the Side of the friction rollers facing the wall are each assigned at least one deflecting roller such that, on the one hand, the belt leaves the friction rollers with a parallel extension to the wall and, on the other hand, a section of the belt lying in the winding direction at the front then deflects substantially perpendicularly the recess of the wall is guided.

The particular advantage of the invention is that the assembly of the belt does not require the removal of a friction wheel. The assembly can thus be considerably simplified. The basic idea of the invention is to fold the belt around the friction wheels without the belt cutting an imaginary connecting line connecting the axes of the friction wheels. The spur gears assigned to at least two friction rollers are coupled indirectly via a further spur gear, so that the friction rollers rotate in the same direction.

According to one embodiment of the invention, a guide roller assigned to the friction roller has a double function. To the one enables the vertical alignment of the belt to a transverse recess of the housing or to a recess of the wall. A section of the belt lying in front of the foremost friction roller in the winding direction is deflected such that the belt is guided perpendicular to the recess in the wall. On the other hand, it enables a higher degree of wrap around the belt around the friction roller assigned to the guide roller.

By providing an additional guide roller, which is spatially assigned to a transverse recess of the housing or the recess of the wall, without there being a direct mechanical coupling thereof with one of the friction tubes or the spur gears, in particular the m winding direction of the belt can be at the front Friction roller to be positioned laterally offset to the transverse recess. The corresponding ReibroUen and thus the housing as a whole can be staggered in height, so that an adaptation to the spatial conditions is achieved.

According to a preferred embodiment of the invention, the pair of friction tubes or spur gears is arranged in such an axis-parallel manner to the vertical wall that the belt is looped around the peripheral surfaces of the friction tubes. In this way, a particularly frictional support of the belt on the friction tubes can advantageously be created.

According to a development of the invention, two deflection rollers are positioned on one side of the extension plane of the friction tubes arranged in pairs, the center axes of which are arranged at a distance from one another which is at most the distance between the center axes of the friction rollers. len corresponds to each other. This enables a greater degree of looping of the belt, which enables the belt to be guided safely and reliably.

According to an alternative embodiment of the invention, the spur gears arranged in pairs and each associated with a friction roller are directly coupled to a drive pinion of the drive motor, the central axes of the spur gears being oriented essentially at right angles to the direction of extent of the belt. In this way, a particularly compact and space-saving device is created. Deflection pulleys oriented at an acute angle to the spur gears enable the belt to be twisted in the longitudinal direction thereof.

Both embodiments of the device according to the invention have in common that the belt is looped around the friction rollers, the central axes of the friction rollers forming an extension plane which is arranged parallel to the wall. Because the belt encompasses the friction rollers in a single wrap direction, the device according to the invention can be assembled without having to remove components of the device.

According to a development of the invention, the housing of the device is designed as a modular unit, the deflection rollers on the one hand and the friction rollers or the spur gear wheels on the other hand being mounted on a separate holding plate. Advantageously, the belt can be brought into the assembly position by pulling a loop of the belt through the space formed between the deflection rollers and then looping the friction rollers that the assembly is then completed by locking the holding plates to the wall or to each other.

Two exemplary embodiments of the invention are explained in more detail below with reference to the drawings.

Show it:

FIG. 1 shows a schematic longitudinal section through a device according to the invention according to a first exemplary embodiment,

FIG. 2 shows a perspective view of a housing of the device according to the invention in an exploded view,

FIG. 3 shows a perspective illustration of a device according to the invention according to a second exemplary embodiment and

FIG. 4 shows a top view of the device according to the invention according to FIG. 3.

1 and 2 show a first embodiment of the device according to the invention. A belt 1 of the roller shutter encompasses a first friction roller 2 and a second friction roller 3, which are each rigidly connected to an axially offset spur gear 4 or 5. The spur gears 4 and 5 each engage a common coupling spur gear 6 m, which is arranged between the two spur gears 4 and 5. The ReibroUen 2, 3 and the spur gear 4, 5, 6 form a common plane of extent 7 of the device, which is parallel to one Wall 8 is arranged. The wall 8 has a recess 9 in which one end of the belt 1 is arranged so as to be able to be wound on a disc (not shown) under pretension. The other end of the belt 1 is mounted in a further recess of the wall 8, which is not shown and is spaced upwards from the recess 9 in the vertical direction.

So that the belt 1 is arranged in the shape of an eye under contact of approximately 180 degrees on the circumferential surfaces of the friction grooves 2 and 3, two similar deflection rollers 10 and 11 are arranged on a side of the friction grooves 2 and 3 facing the wall 8. The deflection rollers 10 and 11 are arranged in pairs, like the friction tubes 2 and 3, the axial distance between the deflection rollers 10 and 11 being approximately half smaller than the axial distance between the friction tubes 2 and 3. In this way, a high degree of wrap around the friction tubes 2 and 3 is achieved, which enables the belt 1 to be guided safely and reliably through the device.

One of the two deflection rollers 10 and 11, preferably the deflection roller 10 which is arranged further away from a drive motor 12, is designed as a guide roller which is positioned such that the belt 1 runs vertically into the recess 9 in the wall 8. In this way, a braking device, not shown, of a manual actuation device for the roller shutter is deactivated. By actuating the drive motor 12, the belt 1 can thus be adjusted by the desired path. For this purpose, the drive motor 12 is connected to the second spur gear 5 via a worm gear. As can be seen from Figure I, the drive shaft of the drive motor 12 is as Auger 13 formed, which is in engagement with a helically toothed drive spur gear 14. This drive spur gear 14 is coupled via an axially offset and rigidly connected gear to a spur-toothed further spur gear 15 which is in engagement with the second spur gear 5.

FIG. 2 shows a housing 16 of the device, which essentially consists of a base plate 17, an intermediate plate 18 and a cover plate 19. Corresponding to the recess 9 of the wall 8, the base plate 17 has a transverse recess 20 through which the belt 1 can engage. On the intermediate plate 18, the axially parallel deflection rollers 10 and 11 are mounted spaced apart. The space between the deflecting rollers 10 and 11 corresponds at least in regions to the transverse recess 20 of the base plate 17. The drive motor 12, the spur gears 4, 5, are on the cover plate 19, which extends essentially transversely to the extension of the base plate 17 and the intermediate plate 18 , 14, 15 and the friction rollers 2 and 3 rotatably attached. The plates 17, 18, 19 together form a modular unit that enables simple assembly.

In a first step, the base plate 17 is fastened to the wall 8 by fastening elements, such as screws, etc. The belt 1 is inserted through the transverse recess 20. In a second step, after forming a loop 21 of the belt 1, the same is inserted through the intermediate space formed by the deflecting rollers 10 and 11, so that the intermediate plate 18 can subsequently be mounted on the base plate 17. In a third step, this loop 21 is placed on the circumferential surfaces of the friction rollers 2 and 3 while gripping them and subsequently the cover plate 19 is mounted on holding webs 22 extending parallel to the wall 8 on the intermediate plate 18.

Alternatively, the deflection rollers 10 and 11 can also be rotatably mounted on the base plate 17. In this way, an intermediate plate 18 can be dispensed with.

The pair of ReibroUen 2 and 3 described above forms a plane of symmetry 23 which is perpendicular to the wall 8. Furthermore, the central axes of the friction rollers 2 and 3 extend axially parallel to the deflection rollers 10 and 11.

According to a second exemplary embodiment of the invention according to FIGS. 3 and 4, the drive motor 12 is coupled directly to the spur gear wheels 24 and 25, which are arranged in pairs and on which are arranged axially offset friction tubes 26 and 27, respectively. For this purpose, the drive motor 12 has a drive pinion 28 which is arranged axially parallel between the spur gears 24 and 25 and is in engagement with the same.

Identical components of the second exemplary embodiment in comparison to the first exemplary embodiment are provided with the same reference numbers. Due to the fact that the axes of the spur gears 24, 25 are formed axially parallel to the drive pinion 28, the device can be made compact and space-saving. The axes of the spur gears 24 and 25 extend essentially parallel to the direction of extension of the belt 1. The direction of extension of the pair of spur gears 24 and 25 is thus perpendicular to the direction of extension of the belt 1. To deflect the belt section rotated by 90 degrees in this way, two deflection rollers 29 and 30 are provided, which are arranged on a side facing the wall 8 at an acute angle to the axes of the spur gears 24 and 25. Another deflection roller 31 is arranged at the height of the recess 9 or 15 of the recess 20, so that the belt 1 can engage in the recess 9 at a right angle to the wall 8 thereof. The deflecting roller 31 of the second exemplary embodiment and the deflecting roller 10 of the first exemplary embodiment serve as a guiding roller for the belts 1 and 20 are positioned in a spatially predetermined assignment to the transverse recess 20 of the base plate 17.

Claims

Claims: 1. A device for driving a belt for a roller shutter, the belt being arranged on a disc which is countersunk in a recess in a wall and rotatably mounted, the disc being spring-loaded in the winding direction of the belt, with a housing in which the belt is partially guided , with a base plate of the housing which can be mounted on the wall and which has a transverse recess through which the belt is guided transversely to the wall, with at least two friction rollers arranged axially parallel, on the circumferential surfaces of which the belt rests in regions, with at least two each rotatably the corresponding friction rollers connected and arranged coaxially to the spur gears and with a drive motor that is operatively connected to the spur gears, characterized in that the belt (1) is folded over at least two rotating rotors (2, 3, 26, 27) rotating in the same direction, at least offset two friction tubes (2, 3, 26, 27) via an axis parallel t arranged spur gear (6, 28) are coupled, and that on one side of the friction pipes (2, 3, 26, 27) facing the wall (8) each have at least one deflecting roller (10, 11, 29, 30, 31) are assigned such that on the one hand the belt (1) leaves the friction rollers (2, 3, 26, 27) parallel to the wall (8) and on the other hand a section of the belt lying at the front in a wrap-up direction ( 1) is then guided under deflection substantially perpendicular to the recess (9) of the wall (8). 2. Device according to claim 1, characterized in that the axis of at least two friction rollers (2, 3; 26, 27) span an extension plane which is arranged parallel to the wall (8). 3. Device according to claim 1 or 2, characterized in that the belt (1) is folded around a pair of friction rollers (2, 3; 26, 27) in a loop shape, the belt (1) on one to the other friction roller ( 2, 10 3; 26, 27) facing away from the peripheral surface of a friction roller (2, 3; 26, 27). 4. Device according to one of claims 1 to 3, characterized in that a plane of symmetry (23) of the pair of friction rollers (2, 3; 26, 27) extends perpendicular to the wall (8). 5. Device according to one of claims 1 to 4, characterized in that on one side of the wall (8) facing the extension plane of the pair of friction rollers (2, 3; 26, 27) two deflection rollers (10, 11; 29, 30) are positioned, the center axes of which are arranged at a distance from one another which corresponds at most to the distance of the center axes of the friction rollers (2, 3; 26, 27) from one another. 6. Device according to one of claims 1 to 5, characterized in that the pair of friction rollers (2, 3) is arranged axially parallel to the deflection rollers (10, 11). 7. Device according to one of claims 1 to 6, characterized in that the spur gears (4, 5) assigned to the pair of friction rollers (2, 3) are each in engagement with a coupling spur gear (6) arranged axially parallel to the same. 8. Device according to one of claims 1 to 7, characterized in that the pair of ReibroUen (2, 3) via a gear, in particular a worm gear, is operatively connected to a drive shaft of the drive motor (12), the individual spur gears (14, 15) are arranged side by side. 9. Device according to one of claims 1 to 7, characterized in that the pairs arranged and the pair of friction rollers (26, 27) associated spur gears (24, 25) with one on the other spur gear (24, 25) facing Side arranged drive pinion (28) of the drive motor (12) are engaged. 10. Device according to one of claims 1 to 7 and 9, characterized in that the pair of friction rollers (26, 27) and the pair of spur gears (24, 25) rotated substantially by 90 degrees to the direction of extension of the belt (1) are arranged, the deflecting rollers (29, 30) arranged in pairs on the side of the friction tubes (26, 27) facing the wall (8) at an acute angle to the pair of friction tubes (26, 27) or spur gear wheels (24 , 25) are oriented. 11.Device according to one of claims 1 to 10, characterized in that the housing (16) is designed as a modular unit, the deflection rollers (10, 11) on the one hand and the friction rollers (2, 3) and the spur gears (4, 5, 14, 15), on the other hand, are each mounted on a separate holding plate (18, 19).