EP2211011B1 - Drive and turning device for the lamellae of a blind - Google Patents

Description

The invention relates to a drive and turning device for the slats of a blind, with a bearing housing, which is designed for rotatably receiving a drivable, the bearing housing passing drive shaft, a winding spool for a fastener tape, a turning mechanism for tilting the slats and a stop flange for fixing Angle end positions for the slats, wherein the turning mechanism for moving the slats between defined Winkelendstellungen and for locking the slats in an intermediate angle position comprises at least one turning element and releasably engageable by means of an actuating mechanism with the turning element engageable stop member.

Venetian blinds with a drive and turning device are well known, for example from the WO 2004/059 117 A1 or the EP 10 52 365 B1 , It allows the so-called working position, in which the slats are locked in an intermediate angle position to lower the blinds in a different than in the closed state.

A non-generic drive and turning device is from the DE 20 2006 008885 U1 known. In this document, only two different positions are disclosed, whereby there is no angle intermediate position.

The generic drive and turning devices known from the prior art is based on the common idea of offering the user a blind whose slats can be pivoted not only between two angle end positions - one for lowering, one for raising - but also for lowering the blinds in an angular intermediate position, in which the shutter is practically in a semi-open state, can be locked.

Based on this prior art, it has the object of the invention to provide a novel drive and turning device for the slats of a blind that allows the user a comfortable and varied arresting the slats in different angular positions.

To solve this problem, the invention therefore provides a drive and turning device with the features of claim 1.

The invention thus pursues a completely new approach. While in the prior art to increase the user-friendliness each from above the aperture to be screened shutters was assumed and therefore all suggestions for improvement related to the position of the slats when lowering the blind, the invention assumes that the blind in the morning or to Beginning of a working day is moved from the lowered to the run-up state, which is why the actual need for an angle intermediate position for the slats during the startup of the blind is given.

According to a preferred embodiment of the invention, it can further be provided that the drive and turning device has an actuating element, which can be brought into operative connection with the turning mechanism, for locking the slats in a working position when lowering the blind.

In other words, in this embodiment, four angular positions are provided for the slats, the slats are pivoted between two Winkelendstellungen and locked in two different, lying between the Winkelendstellungen angle intermediate positions, of which an intermediate angle position when lowering the blind and the other intermediate angle position when starting up the blind occupied becomes.

With such a design, the operator is therefore provided with a much more varied and comfortable to use drive and turning device.

A structurally simple solution provides that the actuating mechanism is constantly engaged with the stop element of the turning mechanism.

By the present invention can be driven directly from each angular position on the Winkelzwischenstrellung. That is, it is not a lengthy up and down Lowering the entire blind necessary to get back into the intermediate angle position during startup.

According to the invention, the actuating mechanism has at least one actuating part rotatably mounted in the axis of rotation of the drive shaft and also a freewheeling element operatively connected or operatively connected to the actuating part.

To set the slats in a working position when starting the blind invention is further provided that between the actuating part and the freewheel element, a coupling element by means of which the actuating part and the freewheel element for locking the slats in an intermediate angle position when starting the blind are releasably engageable, is arranged.

According to a structurally simple solution is provided that the coupling element is formed by a coil spring. Of course, the coupling element may also be formed by a differently designed energy storage.

According to a further embodiment of the invention can be provided that the actuating part is formed sleeve-shaped, wherein an end portion of the sleeve-shaped actuating member is rotatably connected to the freewheeling element and the actuating part in its opposite end portion has a stop pin for engagement in the stop element. As low, it has been found that the stop pin viewed from the side is axially frontally protruding disposed on the actuating part.

According to the invention, the freewheeling element rotatably mounted about the axis of rotation of the drive shaft is substantially disk-shaped and has on its outer circumferential surface a guide groove in which a sliding part displaced linearly in the bearing housing is guided.

In order to ensure a freewheel for the sliding part in a rotational direction of the drive shaft, it is further provided that the guide groove is helical and formed in an end portion as a circumferential guide channel without pitch.

Although the transmission of the rotational movement of the drive shaft to the freewheeling element of the actuating mechanism can be realized with different means, an embodiment of the invention provides that the transmission of the rotational movement of the drive shaft to the freewheeling element of the actuating mechanism by means of a planetary gear.

For production-technical reasons and to ensure easy maintenance or replacement if necessary, provides a further embodiment of the invention that at least the actuating mechanism is arranged and formed in a separate, detachably connectable to the bearing housing bearing part.

According to the invention may further be provided that the stop element of the turning mechanism is disc-shaped, wherein arranged on the turning element facing away from the stop element, a stop element for engagement with the stop flange and a means for engagement with the actuating part of the actuating mechanism, wherein a constructive simple solution provides that the means of a guideway in which the actuating part is guided, is formed.

In particular, in a coaxial arrangement of the various drive and turning devices on a drivable drive shaft, it has been found to be advantageous if the guideway is formed as a circular arc-shaped passage opening.

In particular, when the drive and turning device has an operatively engageable with the turning mechanism actuator for locking the slats in a working position when lowering the blind, it has been found in terms of a structurally simple solution to be advantageous if the actuator by means of the sliding part of the actuating mechanism with the stop element of the turning mechanism can be brought into operative connection.

In order to keep the longitudinal extension of the generally substantially cylindrical bearing housing small, provides a further embodiment of the invention that at least the winding spool, the Turning mechanism, the stop flange and the actuator are arranged in a common bearing housing. As low has been found, if the at least the reel spool, the turning mechanism, the stop flange and the actuator bearing housing with the actuating mechanism bearing part is detachably connected.

According to a further embodiment of the invention, the actuating element is movable between an engagement position arresting the stop element in an angular intermediate position and a release position, while the second intermediate angle position for locking the slats during startup of the blind by means of the actuating part and the freewheel element of the actuating mechanism is taken.

According to a further embodiment of the invention, it is provided that the actuating element has a base element and at least two engagement elements arranged thereon, of which a first engagement element is in operative connection with the turning mechanism and / or a second engagement element in operative connection with the lost motion mechanism or can be brought.

In order to bring the first or the second engagement element of the actuating element with the turning mechanism or the lost motion mechanism in operative connection, a change in position of the actuating element in the bearing housing is necessary. For this purpose, according to a preferred embodiment of the invention, it is provided that the actuating element can be moved by converting a rotational movement of the drive shaft into an axial movement in the direction of the axis of rotation between the release and the engagement position. A reliable mode of operation can be achieved if the actuating element, at least during the movement between the release and the engagement position, and vice versa, free from an energy storage loading, in particular spring action is.

In contrast to the prior art, in which this movement of the actuating element is achieved just by applying an energy accumulator, the change of the actuating element between the release and input position in the invention by rotating the drive shaft, whereby on the one hand, malfunctions that can occur when using elastic force accumulators are avoided and, on the other hand, a material-saving solution is provided.

The invention further relates to a drive and turning device for the slats of a blind, with a bearing housing in which at least one winding spool for a fastener tape and a turning mechanism for tilting the slats between defined Winkelendstellungen are rotatably supported by a drive shaft, and one with the turning mechanism in Actuating engageable actuator for locking the slats in a working position when lowering the blind, wherein the actuating element between a stop member in an angular intermediate position arresting engagement position and a release position is movable.

In the solutions known from the prior art, it is necessary due to the structural arrangement of the lost motion mechanism and the actuating element in a separate additional module to apply the actuating element by means of an elastic force accumulator to ensure a change of the actuating element between the engaged and released position. This arrangement of an additional energy storage is reflected in addition to the increased space required additionally negatively on the cost of a Venetian blind bearing work function down.

To circumvent this problem, a further embodiment of the invention therefore provides that the actuating element to the rotation axis R is arranged substantially parallel movable in the bearing housing, wherein the movement of the actuating element between the release and the engagement position by means of the turning mechanism.

It is therefore dispensed with the arrangement of an additional actuator acting on the energy storage and ensured the necessary movement of the actuator in a simple manner with the already existing turning mechanism.

For this purpose, a preferred embodiment of the invention provides that the actuating element to the rotation axis R is arranged substantially parallel pivotable in the bearing housing, wherein it has proved to be favorable when the actuator is pivotally mounted on the bearing housing about an axis of rotation R substantially normal.

This preferred pivotable arrangement of the actuating element in the bearing housing allows a particularly short design and is due to the rotational support of the actuating element is a particularly smooth variant.

According to an alternative embodiment of the invention, it is provided that the actuating element is arranged linearly displaceable in the bearing housing substantially parallel to the axis of rotation R. A continuously guided, translational movement can be achieved when a guide element is arranged or formed on the actuating element, by means of which the actuating element is guided in a linear manner displaceable in a corresponding guide formed on the bearing housing. As low it has been found when the guide is formed by a formed in the wall of the bearing housing passage opening.

According to a further embodiment of the invention, it is further provided that the stop element of the turning mechanism is disc-shaped and has on its outer circumferential surface at least one deflecting element and a locking element, which cooperate with the actuating element. A secure locking of the actuating element on the stop element can be achieved when the locking element is V-shaped.

Such a design of the peripheral surface of the stop element, the stop element can serve not only as in the prior art for locking the slats of an intermediate angle position, but also cause the movement of the actuating element between the release and engaged position and vice versa.

For this purpose, according to a further embodiment of the invention, it is provided that the actuating element is driven during its movement between the release and the engagement position by means of a corrugated wheel, wherein the shaft of the wave wheel of the drive shaft and the wheel of the wave wheel is formed by the stop element of the turning mechanism and the Conversion of the rotational movement of the stop element takes place in a direction of rotation R axial movement of the actuating element substantially by means of the least one arranged on the peripheral surface of the stop element deflecting element.

In other words, therefore, the engagement elements of the actuating element on the peripheral surface of the stop element are reciprocated substantially linearly in the axial direction of the drive shaft depending on the direction of rotation of the drive shaft.

A further embodiment of the invention provides that the stop flange, as known per se, is designed to receive a plurality of stop pins in different positional positions, wherein the different position positions each define different angle end positions.

The invention further relates to a Venetian blind with a drive and turning device according to the invention, which is characterized by a working position for the slats when booting the blind, in which the slats are locked or locked in a lying between two angle end positions angle intermediate position.

A preferred embodiment of such a blind is according to another embodiment characterized by at least two working positions for the slats, of which a first working position when lowering the blind and a second working position when booting the blind is ingestible, the two working positions of two different, between the Both angle end positions lying angle intermediate positions are fixed.

Furthermore, a method for pivoting the slats of a blind according to claim 10 or 11, in which the slats can be locked during startup of the blind in a lying between two Winkelendstellungen angle intermediate position to be specified.

According to the innovation, it is provided that when the blind is raised from the lowered position, the fins are turned inward in a first step until the freewheeling element of the actuating mechanism is blocked by the sliding part, whereby a reversal of rotation of the sun gear of the planetary gear takes place and upon further rotation of the drive shaft Turning over the coupling element and the actuating member which is in engagement with the stop member is moved in a direction opposite to the direction of rotation of the drive shaft rotation until the actuating member is blocked in the bearing part, whereby the lamellae are pivoted in a second rotation intermediate position with a further rotation of the drive shaft and this remain until the next direction of rotation reversal of the drive shaft.

Fig. 1a bis 1c'

unterschiedliche Stellungen der Lamellen beim Senken und Heben der Jalousie gemäß einem ersten Ausführungsbeispiel der Erfindung,

Fig. 2a bis 2d'

unterschiedliche Stellungen der Lamellen beim Senken und Heben der Jalousie gemäß einem weiteren Ausführungsbeispiel der Erfindung,

Fig. 3a

eine Antriebs- und Wendevorrichtung in perspektivischer Darstellung gemäß dem Ausführungsbeispiel nach Fig. 1,

Fig. 3b

eine Explosionsdarstellung des Ausführungsbeispieles gemäß Fig. 3a,

Fig. 3c

einen Längsschnitt durch das Ausführungsbeispiel gemäß Fig. 3a,

Fig. 4a

eine perspektivische Darstellung der Antriebs- und Wendevorrichtung gemäß Fig. 2,

Fig. 4b

eine Explosionsdarstellung des Ausführungsbeispieles gemäß Fig. 4a,

Fig. 4c

einen Längsschnitt durch das Ausführungsbeispiel gemäß Fig. 4a

Fig. 4d

einen Querschnitt entlang der Schnittlinie SS' aus Fig. 4c und

Fig. 5

im Detail das Anschlagelement, das Betätigungsteil und die untere Hälfte des Lagerteiles für den Betätigungsmechanismus.

Further advantages and details of the invention will be explained in more detail with reference to the following description of the figures with reference to the embodiments illustrated in the drawings. It shows:

1a to 1c '

different positions of the slats when lowering and lifting the blind according to a first embodiment of the invention,

2a to 2d '

different positions of the slats when lowering and lifting the blind according to a further embodiment of the invention,

Fig. 3a

a drive and turning device in a perspective view according to the embodiment according to Fig. 1 .

Fig. 3b

an exploded view of the embodiment according to Fig. 3a .

Fig. 3c

a longitudinal section through the embodiment according to Fig. 3a .

Fig. 4a

a perspective view of the drive and turning device according to Fig. 2 .

Fig. 4b

an exploded view of the embodiment according to Fig. 4a .

Fig. 4c

a longitudinal section through the embodiment according to Fig. 4a

Fig. 4d

a cross section along the section line SS 'from Fig. 4c and

Fig. 5

in detail, the stop element, the actuating part and the lower half of the bearing part for the actuating mechanism.

The 1a to 1c ' show the functional principle of a Venetian blind bearing with a working position function when raising the blind.

While in conventional blinds 3, the slats 2 only between two angle end positions A, B, the blinds usually in the closed state (Winkelendstellung B) is lowered and lifted in the half-open state (Winkelendstellung A) can be pivoted, have known drive and

Turning devices with a working position function lying between the angle end positions A, B angle intermediate position C ( Fig. 2a to 2d ), in which the slats in the open state, usually about 50 ° open to the outside, can be locked, so that the blind in this working position of the slats, that can be lowered with incident daylight.

The drive and turning device according to the invention differs from this prior art by an angle between the angles A, B angle intermediate position D, in which the slats in the open state, in approximately horizontal position, can be locked, so that the blind in this working position I of the slats can be raised.

The Fig. 1a and 1a ' show the lowering of the blind 3 in the closed state, that is, the slats 2 are in the angle setting B.

To lift the blind, as in Fig. 1b, 1b ' shown, the slats 2 of the blind 3 turned by changing the direction of rotation to the left of the angle end position B in the Winkelendstellung A.

Upon further start-up of the blind, that is, the drive shaft is rotated to the left, changes, preferably using a freewheel, the direction of rotation of the drive for the actuating mechanism, thereby further Follow the slats 2 into the intermediate angle D ( 1c, 1c ' ) are pivoted, so that the slats 2 are held in one of the angular intermediate position D corresponding open position upon further booting of the blind.

Of course, the invention is not limited to the illustrated, an approximately horizontal position of the lamella corresponding angle intermediate position D. A basic idea of the invention is to provide the user with a Venetian blind whose slats can be locked at startup substantially between the closed position (final angle position A) and the illustrated horizontal position.

In the in the FIGS. 2a and 2d ' In the embodiment shown, the blind additionally has a working position function II when lowering the blind.

The Fig. 2a and 2a ' show this work position function II, in which the slats 2 are held in the intermediate angle position C and the blind is lowered by rotating drive shaft to the right in the arrow direction.

For complete closing of the blind 3, the working position II, that is, the locking of the slats 2 in the intermediate angle position C is first canceled by a change of direction of the drive shaft, before the slats 2 are pivoted by a further change in direction over the intermediate angle position C in the Winkelendstellung B, so the blind is completely closed ( Fig. 2b , b ').

The principle of operation and the functioning of the 2b to 2d ' correspond to the principle of operation and the functioning of the 1a to 1c ' and differs from these only by the intermediate angle C, which in both in the 1a to 1c 'and Fig. 2b to 2d' shown shutdown of the blind does not matter, which is why a further description is omitted.

In Fig. 3a In perspective, a drive and turning device 1 according to the invention is shown, in which the blind bearing 4 has a bearing housing 5, 5 'and a bearing part 25, 25'. The bearing housing 5, 5 'corresponds in size to a standard bearing according to the prior art without work function. At the In the embodiment shown, the bearing housing has a bearing body 5 and a bearing cap 5 ', which are made of plastic, in particular by injection molding, and can be positively connected to one another. The bearing housing is designed for rotatably receiving a drive shaft, not shown, which passes through the bearing body 5 and is rotatable about the rotation axis R.

In the bearing housing 5, 5 'are - as out Fig. 3b seen - coaxially with each other and about the rotation axis R rotatable from left to right, the reel spool 6, the turning mechanism 7 and the stop element 9 is arranged.

The winding bobbin 6 is cylindrical and has a disc-shaped, non-rotatably mounted flange and a passage opening for the drive shaft. At the winding bobbin 6, the coil disc 6 'is mounted on the left of the disk-shaped flange rotatably. The reel disc 6 'has, in addition to a passage opening for the drive shaft, a hole for receiving a carrier tape pin 36, which (not shown) serves for attachment of the wound on the reel winding tape. On the right side of the disk-shaped flange, the turning element 8 and the stop element 9 of the turning mechanism 7 are rotatably arranged on the winding bobbin 6. Between the turning element 8 and the stop element 9, the turning spring 17 is arranged in a conventional manner. A reversing cord 34 is connected both to the turning element 8 and to the individual lamellae 2.

The arranged to the right of the stop element 9 stop flange 27 forms in the embodiment shown at the same time an end wall of the bearing housing 5, 5 'and is rotatably connected thereto.

By means of the stop pins 24 which are inserted into passage openings 38 of the stop flange 27, the angle end positions A, B between which the slats 2 are tiltable, can be defined.

In other words, in the bearing housing 5, 5 ', one end face of the stop flange 27 is formed, an elongated winding coil 6 is formed in the form of a hollow shaft, wherein on the hollow shaft winding bobbin 6, which is rotatable by means of the drive shaft, the turning mechanism 7 is mounted.

With the bearing housing 5, 5 'releasably connected to the bearing part 25, 25', in which the actuating mechanism 10, by means of which the slats 2 can be pivoted into a working position I when starting the turning mechanism 7, arranged.

How out Fig. 3b and 3c can be seen, the actuating mechanism 10 comprises a sleeve-shaped actuating part 11, which protrudes in the assembled state of the drive and turning device 1 through a passage opening in the stop flange 27 in the bearing housing 5, 5 '( Fig. 3c ).

The freewheeling element 14 is operatively connected to the actuating part 11 via a coupling element 12 formed in the embodiment shown by a spiral spring and a coupling ring 13. The freewheeling element 14 is detachably engaged with the actuating part 11 when the blind 3 is raised by means of the coupling element 12. which leads to a locking of the slats 2 in the intermediate angle D position.

The freely rotatable about the rotational axis R of the drive shaft mounted freewheeling element 14 is formed in the embodiment shown substantially disc-shaped and has on its outer peripheral surface a guide groove 16 in which a linearly movably arranged in the blind bearing 4 sliding part 19 is guided. The guide groove 16 extends helically, but is formed in one end portion as a circumferential guide channel without pitch to ensure a freewheel for the sliding part 19 in one direction.

On its side facing away from the actuating part 11 four star wheels 21 of a planetary gear 20 are arranged on the freewheeling element 14, which cooperate with the sun gear 22 and the ring gear 23 of the planetary gear 20. In other words, that means in Fig. 1 and 3 shown first embodiment of a drive and turning device according to the invention in a bearing housing 5, 5 'arranged standard bearings according to the prior art without work function and one in a separate bearing part 25, 25', which is releasably connectable to the bearing housing 5, 5 'arranged Actuating mechanism 10, with which the slats 2 can be pivoted and locked in a working position I when starting up the blind.

The embodiment according to Fig. 4a to 4d corresponds both to the embodiment and the operation of the embodiment 3a to 3c and differs from this only by the presence of an actuating element 18 which in the embodiment shown around the rotational axis a, which is substantially normal to the axis of rotation R, pivotally mounted in the bearing body 5 is and on the first engaging member 31 with the stopper member 9 of the turning mechanism 7 and the second engaging member 30 with the sliding part 19 of the actuating mechanism 10 is engageable.

The mode of operation is as follows: Upon rotation of the guide element 14 guided in the guide groove 16 sliding part 19 is linearly moved in the direction of the bearing housing 5, 5 'until it abuts the engaging member 30 of the actuating element 18, whereby the actuating element 18 is pivoted so in that the first actuating element 31 engages with the deflecting element 32 arranged on the outer circumferential surface of the stop element 9 and is moved further away from it until it engages with the arresting element 33. In a further rotational movement of the drive shaft is then the turning element 8 of the turning mechanism 7 via the turning spring 17 and the then fixed stop element 9 in a position in which the slats 2 in an intermediate angle position C, which corresponds to the working position II when lowering the blind, locked.

Same parts were in the Fig. 4a to 4d numbered the same as in the Fig. 3a to 3c , which is why a further detailed description is omitted.

The operation of the actuating mechanism 10 for taking a working position I of the slats 2 for raising the blind 3 is in accordance with both embodiments Fig. 3 and 4 identical and will be described below.

After canceling the locking of the slats 2 in the intermediate angle position C, which corresponds to the working position II when lowering the blind 3 ( Fig. 2a, 2a ' ), the curtain is completely moved by turning the drive shaft to the right until it is completely closed ( Fig. 2b, 2b ' ). To start up the blind, the Direction of rotation of the drive shaft changed, that is, the drive shaft rotates to the left, wherein the turning element 8 is driven by means of the turning spring 17 to the left, so that the slats 2 are pivoted inwardly ( 2c, 2c ' ).

At the same time, the ring gear 23 drives the freewheeling element 14 via the stems 21 and the sun gear 22. In this case, the sun gear 22 is blocked by the stop element 8, the actuating part 11 and the coupling element 12.

The freewheel element 14 rotates counterclockwise until the cam formed on the sliding part 19, which is guided in the guide groove 16 of the freewheel element 14, blocks the rotational movement, which is the case in the embodiment shown after approximately 1.5 revolutions.

In a further rotation of the drive shaft, the sun gear 22 is rotated via the ring gear 23 and the stator 21 in a direction opposite to the direction of rotation of the drive shaft rotational direction (to the right) and takes the formed by a coil spring coupling member 12 with.

The coupling element 12 in turn takes the operating part 11, which engages over the stop pin 15 with the stop element 9, with. The actuating member 11 rotates against the turning spring 17, the turning ring 8 in opposite direction to the drive shaft rotation direction (to the right) back to the coupling member 12 and the coupling ring 13 abuts the nub-shaped projection 37 located in the bearing part 25.

In a further rotation of the drive shaft to the left, the slats are moved to the horizontal position, that is, they are pivoted in the intermediate angle position D and locked there ( Fig. 2d , d '), and remain until the next reversal of the direction of rotation of the drive shaft in this working position I.

In Fig. 5 is again shown in detail the interaction of the stop element 9 with the actuating part 11 and the bearing part 25. The arranged on the actuating part 11 stop pin 15 is guided in the guide rail 28 formed by a passage opening of the stop element 9, so that the actuating member 11 is constantly in engagement with the stop element 9. On his opposite Front side, the actuating member 11 has an extension 35 which engages in the bearing part 25 and is operatively connected to the knob-shaped projection 37 arranged there or can be brought.

Although the invention has been described in detail with reference to the embodiments shown, it goes without saying that the subject of the application is not limited to the illustrated embodiments. Rather, measures and modifications that serve to implement the inventive idea, quite conceivable and desirable. Thus, for example, could be arranged between the planetary gear and the actuating mechanism a lost motion mechanism to ensure in this way that the turning of the lamellae from the Winkelendstellung B in the intermediate angle D (working position I) is done with fully shut down curtain, and not as in the embodiments shown the turning of the slats is carried out during the first 1.5 revolutions when the blind is raised.

In any case, a basic idea of the invention is to provide a venetian blind in which the slats can be locked during the raising of the blind in an intermediate angle position located between the two angle end positions.

Claims (12)

1. A device (1) for driving and turning the slats (2) of a Venetian blind (3), comprising a bearing housing (5, 5') which is embodied for rotatably receiving a drivable drive shaft penetrating the bearing housing (5, 5'), a winding spool (6) for a carrier band, a turning mechanism (7) for tilting the slats (2) and an abutment flange (27) for fixing angular end positions (A, B) for the slats (2), wherein the turning mechanism (7) for moving the slats (2) between defined angular end positions (A, B) and also for arresting the slats (2) in an angular intermediate position (D) comprising at least one turning element (8) and an abutment element (9) which can be brought releasably into engagement with the turning element (8) by means of an actuating mechanism (10), characterized in that the drive and turning device (1) for arresting the slats (2) is arranged and embodied in an angular intermediate position (D) during raising of the Venetian blind (3), wherein the actuating mechanism (19) acting on the abutment element (9) is embodied so as to run freely in one direction of rotation of the drive shaft, wherein the actuating mechanism (10) has at least one actuating part (11), which is mounted so as to be able to rotate about the axis of rotation (R) of the drive shaft, and also a free-running element (14) which is operatively connected or operatively connectable to the actuating part (11), wherein a coupling element (12), by means of which the actuating part (11) and the free-running element (14) for arresting the slats (2) in an angular intermediate position (D) during raising of the Venetian blind (3) can be brought releasably into engagement, is arranged between the actuating part (11) and the free-running element (14), wherein the free-running element (14), which is mounted so as to be able to rotate about the axis of rotation (R) of the drive shaft, is embodied in a substantially disk-shaped manner and has on its outer circumferential surface a guide groove (16) in which a sliding part (19), which is arranged in the Venetian blind bearing (4) so as to be linearly movable, is guided.
2. The drive and turning device as claimed in claim 1, characterized in that the drive and turning device (1) has an actuating element (18), which can be brought into operative connection to the turning mechanism (7), for arresting the slats (2) in a working position (II) during lowering of the Venetian blind (3).
3. The drive and turning device as claimed in claim 1 or 2, characterized in that the actuating part (11) is embodied in a sleeve-shaped manner, an end portion of the sleeve-shaped actuating part (11) being non-rotatably connected to the free-running element (14) and the actuating part (11) having in its opposing end portion an abutment pin (15) for engaging with the abutment element (9).
4. The drive and turning device as claimed in one of claims 1 to 3, characterized in that the guide groove (16) runs helically and is embodied in an end portion as a peripheral guide channel without an inclination in order to ensure a free run for the sliding part (19) in a direction of rotation.
5. The drive and turning device as claimed in one of claims 1 to 4, characterized in that the rotary movement of the drive shaft is transmitted to the free-running element (14) of the actuating mechanism (10) by means of a planetary gear (20).
6. The drive and turning device as claimed in one of claims 1 to 5, characterized in that at least the actuating mechanism (10) is arranged and embodied in a separate bearing part (25) which is releasably connectable to a bearing housing (5).
7. The drive and turning device as claimed in one of claims 1 to 6, characterized in that the abutment element (9) of the turning mechanism (7) is embodied in a disk-shaped manner, a stop element (26) for engaging with the abutment flange (27) and means for engaging with the actuating part (11) of the actuating mechanism (10) being arranged or embodied on the side of the abutment element (9) that is remote from the turning element (8), wherein the means is preferably formed by a guide track (28) in which the actuating part (11) is guided.
8. The drive and turning device as claimed in one of claims 2 to 7, characterized in that the actuating element (18) has a basic element (29) and at least two engagement elements (30, 31) which are arranged thereon and of which a first engagement element (30) is operatively connected or can be brought into operative connection to the turning mechanism (7) and/or a second engagement (31) element is operatively connected or can be brought into operative connection to the actuating mechanism (10).
9. The drive and turning device as claimed in one of claims 2 to 7, characterized in that the actuating element (18) is arranged in the bearing housing (5, 5') so as to be movable substantially parallel to the axis of rotation (R), the actuating element (18) being moved between the release and engagement positions by means of the turning mechanism (7).
10. A Venetian blind with a drive and turning device as claimed in one of claims 1 to 9, characterized by a raising working position (I) for the slats during raising of the Venetian blind (3), in which the slats (2) are arrested or arrestable in an angular intermediate position (A, B) positioned between two angular end positions (D).
11. The Venetian blind as claimed in claim 10, characterized by at least two working positions for the slats (2), of which a first working position (II) can be assumed during lowering of the Venetian blind (3) and a second working position (I) can be assumed during raising of the Venetian blind (3), the two working positions (I, II) being fixed by two different angular intermediate positions (C, D) positioned between the two angular end positions (A, B).
12. A method for swiveling the slats of a Venetian blind as claimed in one of claims 10 or 11, in which the slats are arrestable during raising of the Venetian blind in an angular intermediate position positioned between two angular end positions, characterized in that during raising of the Venetian blind (3) from the lowered position the slats (2)

    a) are in a first step turned inward until

    b) the free-running element (14) of the actuating mechanism (10) is blocked by means of the sliding part (19), as a result of which the direction of rotation of the sun wheel (22) of the planetary gear (20) is reversed and, on further rotation of the drive shaft,

    c) the turning element (8) is moved via the coupling element (12) and the actuating part (11), which is engaged with the abutment element (9), in a direction of rotation opposite to the direction of rotation of the drive shaft until

    d) the actuating part (11) is blocked in the bearing part (25), as a result of which,

    e) on further rotation of the drive shaft, the slats (2) are swiveled into the second angular intermediate position (D) and remain therein until the next reversal of the direction of rotation of the drive shaft.

Images