DE202009009450U1 - Drive device for motorized movement of a sliding door - Google Patents

Abstract

Drive device (1) for moving a motor - in particular for opening and / or closing - movable furniture parts of furniture, in particular for opening and / or closing a sliding door (2) on a furniture (3) having at least one or more of the sliding doors (2), and comprising:
a. a mounting base (4) which can be fixed to the furniture and to which at least one electric motor (6) is fixed, which acts on the sliding door (2) via a gear arrangement,
b. wherein the gear arrangement comprises two after a predetermined sliding path of the furniture part, in particular the sliding door, out of engagement and in a subsequent closing of the furniture part, in particular the sliding door, again engaging each other, transmission elements (8, 9), and / or
c. wherein the gear assembly comprises a transmission element that is designed, after a predetermined sliding path of the furniture part, in particular the sliding door (2), with the furniture part, in particular the sliding door, out of engagement and at a subsequent closing of the furniture part, in particular the sliding door, again with this / this in ...

Description

The The invention relates to a drive device for motorized movement - in particular for opening and / or closing - moving Furniture parts of furniture, in particular for opening and / or closing a sliding door on at least one or more of the sliding doors having furniture is designed.

It is known to accelerate movable furniture parts by means of electric motor driven drive devices. The state of the art is on the DE 20 2006 006 190 U1 and the DE 20 2006 006 189 U1 directed.

The known solutions are to drive sliding doors not or not optimally suited.

In front In this background, it is the object of the invention, a drive device to create movable furniture parts which especially suitable for use on sliding doors particularly advantageous is.

The Invention solves this problem by the subject matter of the claim 1.

After that the drive device has a fixable to the furniture Mounting base on which fixed at least one electric motor is that via a gear assembly on the sliding door acts, wherein the gear arrangement two after a predetermined Sliding path of the furniture part, in particular the sliding door, disengaged and at a subsequent Closing the furniture part, in particular the sliding door, again engaging each other, having transmission elements, and / or wherein the gear assembly is adapted to a predetermined Sliding path of the furniture part, in particular the sliding door, with the furniture part, in particular the sliding door, disengaged and at a subsequent closing the furniture part, in particular the sliding door, again to engage with this / this.

advantageous Embodiments of the invention are the subclaims refer to.

These Arrangement brings with it the particular advantage that the engine the entire distance from the closed position to the maximum can be fully energized by him open position - d. h., that the sliding door on a short way maximum can be accelerated. During the acceleration process from 0 to maximum, the current preferably increases according to one Ramp function on. This results in a nearly constant acceleration.

About that In addition, the drive device can be kept relatively small and it is not necessary to use the maximum opening stroke to extend the sliding door.

It has also been found to give the user already a supportive Sliding the sliding door over the first part their opening way, the handling already significantly easier and that further opening the sliding door increased the ease of use only insignificantly.

Especially It is advantageous if the drive device has a synchronization and / or Vorbeschleunigungseinrichtung designed to is, the decoupled transmission elements in a closing operation synchronizing and / or pre-accelerating with each other bring, because so the transmission spared and the synchronization of the Furniture part is improved. Furthermore, by the Pre-accelerate a gently starting rotary motion instead of a sudden achieved rotational movement. In addition, arise less noise.

Especially advantageous for use on a sliding door, it is when the engageable and disengageable transmission elements as a rotatable gear and a meshing, linear slidable rack are formed, because these elements are cheap and compact on a mounting base (or in a housing) and can be well in and disengaged.

In In this case, it is advantageous if the synchronization and / or Vorbeschleunigungseinrichtung is designed to the gear at a closing operation before engaging the gears To accelerate these elements, so as to the gear assembly Overall from damage especially by very fast to protect thrown sliding doors.

The Power transmission from the output of the motor to the gear can be done in particular via a pair of bevel gears. Conceivable is under certain conditions, no self-inhibition that the drive can also be done via a worm gear. There are also other embodiments of the power transmission from the engine to the gearbox to operate the sliding door conceivable.

The Attachment of the drive unit can on the one hand to the rail arrangement z. B. the guide rail or the running profile of the furniture and on the other hand done directly on the cover plate. Furthermore The drive unit may be located on or under the cover plate.

Preferably, a is on the rack Rack segment slidably guided, which also remains after a disengage the rack and the gear with the gear engaged. By this simple structural means a synchronization of the two disengaged gear parts rack and gear is achieved in a particularly advantageous manner.

Especially is also advantageous on the mounting base (or on the housing) a control curve formed or arranged, in which a pin engages on a rotatable relative to the gear Laufwegbegrenzungsteil is trained. This will be a particularly simple and accurate working alternative embodiment of the rotational angle limiting device created. Kinematic reversals of this design are conceivable. A translational guide of the pen for training a Laufwegbegrenzung is also conceivable.

following The invention will be described with reference to the drawing based on embodiments described in more detail. It shows:

1a -D is a plan view of a first drive device without a motor, in four successive operating states, as they occur when moving a sliding door.

2a -E is a plan view of parts of a transmission for the drive device 1 in five consecutive operating conditions, such as occur when closing a sliding door;

3a Fig. 2 shows two views of some transmission elements of a transmission for a drive device;

4a -I a furniture with a drive device with motor in different views and opening conditions, partially in detail view;

5a -E is a plan view of another drive device in several successive operating states, as they occur when moving a sliding door;

6a -E views of the arrangement of the drive device on a guide rail of a piece of furniture;

7 a plan view of a third drive device;

8a Figure-b is a plan view of parts of a transmission and a sensor device for the drive device 7 in two operating states, as they occur when moving a sliding door;

9a -D diagrams, which exemplify the relationship between the engine torque and the door speed and the opening path of the sliding door when opening and closing a sliding door with a drive device of the type 7 illustrate;

10a Various operating conditions when moving a sliding door in a further embodiment of the invention.

11a Various operating conditions when moving a sliding door according to the embodiment of 10 ;

12a -D various other operating states of the embodiment de 10 ;

13a -D various other operating states of the embodiment of the 10 ;

14 View of a further embodiment of the invention in the extended state;

15a B View of an embodiment of the invention according to 14 in the extended state

16 View of an embodiment of the invention according to 14 in the retracted state;

17a B View of an embodiment of the invention according to 16 in the retracted state;

18 Exploded view of the components of the invention.

The 1a to c show a drive device 1 for motorized movement - in particular for opening and / or closing - movable furniture parts of furniture, in particular for opening and / or closing a sliding door 2 on at least one or more of the sliding doors 2 having furniture 3 is designed (see 4 ).

The drive device 1 has a mounting base 4 which may also be designed as a housing, wherein it is then preferably closed by a cover part, not shown here, and on a furniture body 3b of the furniture 3 is fastened, preferably on or in a base or cover plate 3a of the furniture body 3b ,

The sliding door 2 runs in here not in detail to be recognized way with roles in a rail arrangement of the furniture. Preferably, each sliding door 2 each associated with one of the drive devices. The 4a ) to 4c ) and 4d ) to f), different opening states each show ei ner of the sliding doors 2 in different views.

On the furniture side immovably fixed mounting base 4 (eg the 1 ) is at least one electric motor 6 (by type of 5 or 7 ), the z. B. via a gear assembly, the sliding door 2 accelerate or decelerate.

The electric motor 6 is about pinion (not visible here) and possibly one or more optional - the output shaft upstream and / or downstream - gear elements with a gear arrangement 5 coupled.

The gear arrangement 5 has a rotatable - in 5 similar to a crown wheel - first gear 7 on, on its axis 19 another rotation with the first gear 7 connected another gear 8th is arranged, which is also integral with the first gear 7 may be formed and that via an external toothing with a toothing on the mounting base 4 slidably guided rack 9 can be brought into engagement (see, for example, 1d ).

The rack 9 is designed to have a coupling device - here as a fork-like driving element 10 is formed - in which a corresponding drive member - like a pin 31 - on the sliding door 2 attacking in a curve guide 30 guided driver 29 engages in the sliding direction X or opening direction positively or negatively accelerating, ie possibly also braking, on the sliding door 2 act.

The Basic function of this drive is as follows.

Is the preferably designed as a DC motor electric motor 6 energized to rotate in the corresponding direction, the gear wheel rotates 5 with which in turn the rack 9 shifts the sliding door 2 defers. Such is the sliding door 2 from the closed position over part of the maximum with the sliding door 2 postponed feasible sliding path. When energizing the electric motor 6 for rotation in the opposite direction, however, a closing of the sliding door 2 ,

With the help of the electric motor 6 it is also possible to counteract a (too) rapid manually initiated closing movement in a braking manner ( 9c , d).

The driving devices of 1 to 8th are preferably designed such that the rack 9 and the second gear meshing with it 8th after sweeping a predetermined opening path - preferably well before reaching the end-opening position of the sliding door 2 after a few cm of travel (eg in the position of the 4c ) - disengaged.

The 2a To e show the re-engaging the rack 9 with the second gear 8th when closing the sliding door 2 , The direction of rotation Y shows the direction of rotation of the gear arrangement 5 during the closing process. When approaching the rack 9 becomes the second gear 8th over the lead 13 and the jetty 12 back into engagement with the rack 9 brought. Thus, the rack 9 and the second gear 8th "Exactly" merged again. Furthermore, about the lead 13 and the jetty 12 the gear arrangement and thus also the engine 6 accelerated to a safe and "gentle" engagement of the rack 9 and the second gear 8th to ensure.

At the same time or immediately before or after the sliding door 2 and the driver 29 at the door with the sliding door 2 attached transmission bolts 32 out of engagement z. B. is thereby realized that the driver 29 rotatable or pivotable in a curved guide 30 is guided, so that at the sliding door 2 fixed transmission bolts 32 after reaching the maximum movement position of the driver 29 in the curve guide 30 from the driver 29 while he is closing again in the driver 29 enters and over the pin 31 the driver element 10 and the rack 9 takes with you, then again with the gear 8th engaged ( 6a to e).

The rack 9 for example, to the mounting base 4 have a T-shaped groove, in which a parallel to the sliding direction X of the sliding door extending, corresponding rail contour 11 at the mounting base 4 engages, leaving the rack 9 at the mounting base 4 slidably guided. Alternatively, z. B. a groove in the mounting base and an engaging this Schienstück on the rack 9 be educated.

The sliding door 2 can be over with the rack 9 and the curve guide 30 maximum achievable open position addition by their own kinetic energy after disengaging the drive device 1 continue in the guide rail 33 move to the maximum open position ( 9a , b), whereby it is braked by friction or can be moved manually in this position. After disengaging the rack becomes the electric motor 6 braked ( 9a ), which was preferably previously accelerated constantly during the opening movement; 9a , b). Such is the sliding door 2 be maximally accelerated in a short way.

The construction described above involves the necessity of the toothings of the rack 9 and the gear 8th when closing again engage each other.

This is significantly simplified and facilitated according to the invention in that on the gear parts gear 8th and rack 9 a synchronization and / or Vorbeschleunigungseinrichtung is arranged or formed, which serves the engagement of rack 9 and gear 8th thereby optimizing the rack 9 already starts, the gear 8th to turn and accelerate before the teeth of the gear 8th and the rack 9 engage each other.

This can be achieved in a simple way that the gear 7 a projecting outwardly beyond the outer circumference of the toothing projection, in particular web 12 is provided - for example, a radially extending beyond the circumference of the teeth extending web 12 on which a lead 13 on the rack when closing the sliding door 2 first runs up, leaving the gear 7 is rotated ( 1a . 2a , b).

The jetty 12 can be as a rib on one of the axial sides of the gear 5 be educated.

A supportive synchronization between the teeth on the rack 9 and on the gear 8th is reached when the jetty 12 radially with the tip of one of the teeth of the gear 8th flees ( 1 ) or this is slightly advanced in the direction of rotation ( 2 ) and extends radially beyond this tip.

Such are the teeth of the rack 9 and the gear 7 are easily engaged with each other as the rack moves in the direction of the gear and finally reaches it ( 1b ; 2c ).

Then, for example, the motor can act on the sliding door in a braking manner ( 1c . 2d , e).

The Pre-accelerating and synchronizing the gears has an effect in particular also advantageous to the transmission life, since the transmission with the invention only slowly to the high speed is accelerated, with which the sliding door at Close moves.

The electric motor 6 can also be used to the sliding door 2 after engagement and after any necessary initial deceleration into the maximum achievable closed position to pull ( 1a . 8c , d).

To ensure that the gear is when closing the door in a suitable rotational angular position in which the projection meets the radial web in a suitable manner, a rotation angle sensor can be arranged on the gear arrangement to determine the angular position thereof, and then with the electric motor 6 Align the gear properly after disengaging.

For easier realization of the function of correct alignment of the web 12 but without an additional sensor, it is advantageous to the gear arrangement 5 interpreted as such that they bring out of engagement of the gear 8th and the rack 9 always remains in the same, predefined rotational position.

This can be achieved by attaching to the gear arrangement 5 Rotation angle limiting means are formed.

These rotation angle limiting means can be an end stop 17 - z. B. a radial rib 17 on the housing, in particular on the in 3 only partially shown mounting base 4 - Include, to which a corresponding end stop - in particular a corresponding radial rib 14 on the housing, in particular the mounting base facing gear arrangement 5 then, or shortly after, when the rack strikes 9 disengaged from the gear ( 3a , b) or has arrived.

The jetty 12 and the rib 14 are preferably on the opposite axial surfaces of the gear arrangement 5 educated.

so An angle of rotation of a little less than 360 ° is achievable.

In order to be able to cover a larger angle of rotation, according to a structurally simple and inexpensive variant of the invention is a freely rotatable disc 15 on the axis of the gear arrangement 5 between the gear arrangement 5 and the housing, in particular the mounting base 4 arranged on their opposite axial sides also stops, in particular ribs 17 . 18 , Which are arranged and aligned such that they each in one or the other direction of rotation against the corresponding stops / ribs 13 . 14 the gear arrangement 5 and the housing can strike. In this way, the maximum paintable angle of rotation can be appropriately increased.

Max is with this disc 15 an increase in the angle of rotation by just under 360 ° (due to the non-negligible circumferential extension of the ribs 15 . 18 ). Through 1 to n further, analogously formed, freely rotatable discs (not shown here) with stops or ribs, the achievable angle of rotation can be further increased.

Such can easily on a sense and driving the appropriate position of the double gear (gear arrangement 5 ) after disengaging the gear 8th and the rack 9 be waived.

To the electric motor 6 To be able to control suitable, it is also advantageous, the absolute position of the rack 9 or coupled with this sliding door 2 to be able to determine.

This can be done, for example, by means of a sensor device 20 for sensing the position of the rack 9 be realized in the sliding direction.

This sensor device according to an embodiment of the invention is particularly advantageously realized by the following means (see 7 and 8th ).

Thereafter, the sensor device 20 one on an axis 21 laterally next to the gear arrangement 5 rotatably mounted rotary lever element 22 on, on one end 23 a spring-loaded thrust element 24 a capacitive or inductive linear-position sensor 25 interacts and its other end 26 always at an angle relative to the sliding direction X angularly aligned edge 27 the rack 9 is applied.

If the edge 27 at which the rotary lever element 22 is present when closing the sliding door 2 moves by a movement of the rack, it moves the rotary lever element 22 against the on the push element 24 acting spring force. Will the rack 9 (eg in 8th further to the right), the push element becomes 24 accordingly (eg in 8th moved further to the left).

The push element 24 is z. B. as a current-inducing element to an inductive sensor or the like. Formed or as a capacitance-changing element on a plate capacitor.

Such is the absolute position of the rack 9 In any case, simply sensible via a certain path and there is a clear relationship between the position of the thrust element and the position of the rack given or sensible, which is available to control the drive device.

9 shows that the door with the illustrated drive device initially preferably by constant energization of the electric motor 6 is accelerated almost linearly until the rack 9 and the gear 6 disengage.

Then the electric motor 6 slowed down and the sliding door 2 rolls out, preferably up to its maximum achievable end position ( 9a , b).

Closing the sliding door 2 initially done manually by a person. Then arrive the rack 9 and the gear 8th engaged again, what with the sensor device ( 20 ) is determined. Now the engine can 6 (if the sliding door is closed too fast) may act as a brake and / or -. B. after an initial braking of the sliding door - support the cuddling. The braking effect can even be increased when the currentless and / or energized motor.

The braking effect of a currentless motor (actually then generator) consists only of mechanical friction. If the motor (generator) is short-circuited, an electrically generated braking torque is generated. If the motor is supplied with a current which generates a torque opposite to the load torque, a considerably higher braking torque can be generated (in 9 shown).

Preferably, the engine brakes 6 the door first and then slowly pulls it into its closed position. For this purpose, a suitable control device 28 with the sensor device 20 and the electric motor 6 to connect, which is integrable in the housing, which is schematically in 7 is shown.

The shown drive device is not only suitable for opening and closing sliding doors but also to Sliding and closing of roller bearings Sharing furniture.

To operate the drive device to open the sliding door 2 needs the sliding door 2 to be moved by a small triggering path by the operator preferably in the opening direction or alternatively in the closing direction. This movement is registered via the linear path sensor and leads to the triggering of the drive device. Thus, the opening of the sliding door 2 advantageous by a slight pressure on the sliding door 2 started in the opening direction. The pressure on the sliding door moves it for a short distance (preferably approx. 1 mm) so that the control electronics can detect this movement and interpret it as an opening command. It is further provided that the controller is designed so that an external input signal of z. As a radio switch, a manually operated button or other state of the art command devices can be processed.

Furthermore The controller may preferably deliver an output signal with whose help z. B. a lighting in the cabinet can be turned on can be turned on, but also other useful facilities can.

The 10a ) to d), 11a ) to d), 12a ) to d) as well 13a ) to d) show various views and operating states of a further embodiment of the invention.

Also after 10 is the drive device 1 for motorized movement - in particular for opening and / or closing - movable furniture parts of furniture, in particular for opening and / or closing a sliding door 2 on at least one or more of the sliding doors 2 having furniture 3 designed (see 4 ).

It also shows the mounting base 4 on, on the furniture body 5 of the furniture 3 is fastened (see in particular again 4 such as 18 ).

Again, the electric motor 6 to z. B. over the output shaft forward and / or downstream - transmission elements rotatably with a gear arrangement 5 coupled.

The gear arrangement 5 has a rotatable - in 5 end-toothed - first gear 7 on, on its shaft 19 another rotation with the first gear 7 connected another gear 80 is arranged, which is also integral with the first gear 7 may be formed and that via an external toothing with a toothing on the mounting base 4 slidably guided rack 90 can be brought into engagement.

The rack 90 is in turn designed to positively or negatively accelerate via a coupling device in the sliding direction or opening direction X, ie possibly also braking, on the sliding door 2 act.

Again, the gear assembly, the two after a predetermined sliding path of the furniture part, in particular the sliding door, out of engagement and in a subsequent closing of the furniture part, in particular the sliding door, again engaging each other, transmission elements 80 . 90 which are the rack 90 and the gear 80 is.

Different than after 9 but is on the sliding rack 90 a turn relative to the rack 90 and to the mounting base 4 relatively movable rack segment 91 slidably guided, which also after disengaging the rack 90 and the gear 81 with the gear 80 remains engaged.

The rack segment 91 here is an example of six teeth 92 on that at a base 93 are formed, which is guided displaceably on the rack. This can for example be realized by the fact that the base 93 with a T-piece approach (see 18 ) in a rail-like recess 94 the rack 90 engages, wherein the rail-like recess 94 is aligned parallel to the sliding direction X and wherein is dimensioned such that the rack segment when closing the sliding door laterally in the sliding direction X with a part of its teeth 92 On the other hand, some of the teeth of the rack segment can move beyond the last tooth of the rack 91 and the rack 90 to keep one another in cover.

The Function of this arrangement is as follows.

If the movable furniture part (in particular a sliding door) is closed by hand (in the direction of - X), the rack moves 90 (with the toothed segment 91 ) to the right. This shifts first with the gear 80 engaged rack segment 91 relative to the rack 90 against the direction X ( 10a , b u. 11a , b) until the gear 81 on the first tooth of the rack 90 runs up ( 10b u. 11b ). Now the rack segment moves together with the rack 90 ( 10c . 10d u. 11c . 11d ).

Since there are always teeth of the rack segment 91 and the rack 90 Covered, it is ensured that the rack 90 and the gear 80 safely engage again.

Through the rack segment 91 a synchronization device is provided which is adapted to the decoupled transmission elements gear 80 and rack 90 synchronizing again with each other.

In addition, the movable rack segment 91 with a Vorbeschleunigungsvorrichtung in the form of an over the outer circumference of the gear 8th radially projecting web are combined, as he z. B. after 2 is provided.

To 12a are you. 13a to d shows how the arrangement behaves when trying to pull the sliding door with the electric motor. In this case, the movable rack segment 91 only one tooth further in the closing direction (door-to-direction) moved or pulled ( 12a . 12b u. 13a . 13b ) until it reaches the rack 90 reaches a stop. Now the toothed rack is shifting gene segment 91 and the rack 90 come back together and be powered by the gear 90 move to the closed position ( 12a to 12d u. 13a to 13d ).

To 14 to 17 Alternative rotation angle limiting means are disclosed.

After that, at the mounting base 4 or on the housing) a control cam is formed or arranged.

This can be realized simply by having a plate on the mounting base or on the housing 34 is fixed, with a control curve 35 is provided.

Preferably, the control cam 35 as a spiral curve-like, slot-shaped path in the plate 34 formed, in which a pin 36 engages on a relative to the gear 70 rotatable Laufwegbegrenzungsteil 37 is trained. To allow the pin to move in the web, can be on the gear 70 a slot 38 , in particular in an arc shape, be formed. Another slot 40 is in the Laufwegbegrenzungsteil 37 educated. The Laufwegbegrenzungsteil is rotatable on the gear 70 stored, so the slot 40 around the axis 19 is displaceable. The track limiting part 37 is pivotable about the axis 41 stored, their storage on the gear 70 is arranged.

Preferably turns with the spiral path the rotation to about 2.2 turns limited.

These rotation angle limiting means are structurally simple and yet work very precisely. The 14 and 16 each show the maximum rotational positions. This show the 14 as well as the 15a and 15b the maximum extended state of the rack 90 , The 16 as well as the 17a and 17b show the maximum retracted state of the rack 90 , The stop 39 in 15a and 15b limits the over the control curve 35 defined permissible rotational movement in the extension direction.

The 18 shows the components of an embodiment of a drive device according to the invention. A housing base 102 as well as an upper housing part 103 enclose the drive device. In an inner housing lower part 100 is the control curve 35 educated. An inner housing shell 101 encloses the components runway demarcation part 37 , Gear 80 , Drehebelelement 22 , Rack 90 , Rack segment 91 as well as the electric motor 6 , The inner housing, formed from the inner housing lower part 100 and the inner housing shell 101 , is floating in the housing, formed from the lower housing part 102 and the upper housing part 103 stored.

1

driving device

2

sliding door

3

Furniture

3a

cover plate

3b

furniture body

4

mounting base

5

gearing

6

electric motor

7

first gear

8th

second gear

9

rack

10

dogging

11

rail contour

12

web

13

head Start

14

rib

15

disc

16

rib

17

rib

18

rib

19

axis

20

sensor device

21

axis

22

Rotation lever member

23

The End

24

push element

25

Linear position sensor

26

The End

27

edge

28

control device

29

takeaway

30

curved guide

31

spigot

32

transmission bolts

33

guide rail

34

plate

35

cam

36

pen

37

Laufwegbegrenzungsteil

38

Long hole

39

attack

40

Long hole

41

axis

70

gear

80

gear

90

rack

91

Rack segment

92

teeth

93

Base

94

recess

100

Inside housing base

101

Inside the upper housing part

102

Housing bottom

103

Housing top

X

sliding direction

Y

direction of rotation

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 202006006190 U1 [0002]
• - DE 202006006189 U1 [0002]

Claims (23)

Drive device ( 1 ) for motorized movement - in particular for opening and / or closing - movable furniture parts of furniture, in particular for opening and / or closing a sliding door ( 2 ) on at least one or more of the sliding doors ( 2 ) furniture ( 3 ), and comprising: a. a fixable on the furniture mounting base ( 4 ), at least one electric motor ( 6 ), which has a gear arrangement on the sliding door ( 2 ), b. wherein the gear arrangement two after a predetermined sliding path of the furniture part, in particular the sliding door, out of engagement and in a subsequent closing of the furniture part, in particular the sliding door, again engaging each other, transmission elements ( 8th . 9 ), and / or c. wherein the gear arrangement has a gear element that is designed, after a predetermined sliding path of the furniture part, in particular the sliding door ( 2 ), with the furniture part, in particular the sliding door, out of engagement and in a subsequent closing of the furniture part, in particular the sliding door, again with this / these engage. Drive device according to claim 1, characterized in that that it is a synchronization and / or Vorbeschleunigungseinrichtung which is adapted to the decoupled transmission elements synchronizing and / or pre-accelerating during a closing operation to engage with each other. Drive device according to claim 1 or 2, characterized in that the engageable and disengageable transmission elements as a rotatable gear ( 8th ) and an intermeshing, linearly displaceable rack ( 9 ) are formed. Drive device according to claim 1, 2 or 3, characterized in that the engageable and disengageable gear and furniture parts the rack ( 9 ) and the sliding door ( 2 ) are. Drive device according to claim 1, 2 or 3, characterized in that the engageable and disengageable transmission parts of the rack ( 9 ) and the second gear ( 8th ) are. Drive device according to claim 1, 2 or 3, characterized in that the engageable and disengageable gear and furniture parts of the driver ( 29 ) and the sliding door ( 2 ) fixed transmission bolts ( 32 ) are. Drive device according to claim 3, 4 or 5, characterized in that the synchronization and / or Vorbeschleunigungseinrichtung is adapted to the second gear ( 8th ) to accelerate in a closing operation before engaging the gears of these elements. Drive device according to claim 7, characterized in that the synchronization and / or Vorbeschleunigungsvorrichtung one over the outer periphery of the second gear ( 8th ) radially projecting web ( 12 ) having. Drive device according to claim 8, characterized in that the web ( 12 ) with a lead ( 13 ) on the rack ( 9 ) cooperates. Drive device according to claim 7 or 8, characterized in that the gear ( 8th ) a transmission element of a gear arrangement ( 5 ), which is a rotatable first gear ( 7 ), on whose axis ( 19 ) further the further, rotationally fixed with the first gear ( 7 ) connected or formed further gear ( 8th ) is arranged, which in turn via its external toothing with the at the mounting base ( 4 ) Slidably guided rack ( 9 ) is engageable. Drive device according to claim 10, characterized in that the rack ( 9 ) via a coupling device with the sliding door ( 2 ) can be coupled. Drive device according to one of the preceding claims, characterized in that the gear arrangement ( 5 ) is designed so that they disengage the gear 8th and the rack 9 always remains in the same, predefined rotational position. Drive device according to one of the preceding claims, characterized in that on the gear arrangement ( 5 ) Rotation angle limiting means are formed. Drive device according to one of the preceding claims, characterized in that the rotation angle limiting means a stop ( 17 ) at the mounting base ( 4 ) and a stop ( 14 ) on the gear arrangement ( 5 ) exhibit. Drive device according to one of the preceding claims, characterized in that the rotation angle limiting means further comprises one or more free on the axis of the gear arrangement ( 5 ) rotatable disc (s) ( 15 ) have / on their axial faces facing away from each other stops ( 14 . 17 ), which for cooperation with the attacks ( 16 . 18 ) at the mounting base ( 4 ) and the gear arrangement ( 5 ) are formed. Drive device according to one of the preceding claims, characterized in that the stops as radial ribs ( 14 . 16 . 17 . 18 ) are formed. Drive device according to one of the preceding claims, characterized in that a rotation angle sensor on the gear arrangement ( 5 ) is arranged. Drive device according to the preamble of claim 1 or according to one of the preceding one of the preceding claims, characterized by a sensor device ( 20 ) for determining the position of the rack ( 9 ) and / or the sliding door. Drive device according to one of the preceding claims, characterized in that the sensor device ( 20 ) a rotatably mounted rotary lever element ( 22 ), on one end of which ( 23 ) a spring-loaded thrust element ( 24 ) of a capacitive or inductive linear-position sensor ( 25 ) and its other end ( 26 ) at least temporarily when opening or closing at a relative to the sliding direction (X) angularly aligned edge ( 27 ) of the rack ( 9 ) is present. Drive device according to one of the preceding claims, characterized in that on the rack ( 90 ) a rack segment ( 91 ) is displaceably guided, which also after a disengage the rack ( 90 ) and the gear ( 80 ) with the gear ( 80 ) remains engaged. Drive device according to one of the preceding claims, characterized in that on the mounting base ( 4 ) or on the housing a control cam ( 35 ) is arranged or arranged, in which a pin ( 36 ) engages on a relative to the gear ( 70 ) rotatable Laufwegbegrenzungsteil ( 37 ) is trained. Drive device according to one of the preceding claims, characterized in that the control cam ( 35 ) is spiral. Drive device according to one of the preceding claims, characterized in that the Laufwegbegrenzungsteil ( 37 ) a slot ( 40 ), in particular in arcuate form, which is arranged around the axis ( 19 ) is displaceable.