DE10207319B4 - Pinch protection for auxiliary sliding and pivoting sashes - Google Patents

Abstract

Pinch protection (10) for power-operated sliding or pivoting sashes, in particular for movable window panes and pivotable flaps in vehicles, with a gear unit (2) which can be switched on and off with an auxiliary power drive (22), in which a sensor unit (4) with a computer element (98 ) a measured value for a relative displacement of a drive element and a drive element is determined and wherein the sensor unit (4) switches off the auxiliary power drive (22) in the event of a deviation from a predetermined threshold value, characterized in that
that the gear unit (2) comprises an elastic driver element in addition to the drive element and the driven element, the drive element being drivable by the auxiliary power drive (22) and the elastic driver element being connected on the one hand to the drive element and on the other hand to the driven element, so that one of the auxiliary drive (22) generated and transmitted to the drive element movement with play is transmitted to the output element and thus to the sliding or pivoting wing, and
that the sensor unit (4) in addition to the computer element (98) has at least one drive sensor (82, ...

Description

The invention relates to an anti-trap device for auxiliary sliding or pivoting wings the preamble of claim 1.

Pinch protection of the type mentioned here is, for example, in the French publication FR 2 564 971 A1 described. The pinch protection of this document comprises two electrically conductive sensor elements interacting with one another via an electrical variable, one of which is assigned to the movable window pane of the vehicle and the other is accommodated in a sealing strip arranged on the window frame and receiving the edge of the window pane when the window is closed. In addition, a detector is provided for detecting temporal fluctuations in the electrical quantity. When the window is closed, the edge of the window pane and the sealing strip and thus the two sensor elements approach one another, which causes the electrical variable to fluctuate over time. This fluctuation is detected by the detector. If the time fluctuation disappears for a certain period of time, which is the case, for example, if a body part located between the edge of the window pane and the sealing strip inhibits the movement of the window pane when the window is closed, the detector switches off the auxiliary power drive.

From the publication DE 199 29 455 A1 , especially the 1 and 2 , Pinch protection for auxiliary power operated sliding sashes, in particular for sliding doors in vehicles, with a gear unit (which can be switched off and switched off auxiliary power drive) is known, in which a measured value for a relative displacement of the drive element and the drive element is determined by means of a sensor unit with a computer element, and in the event of a deviation from a predetermined threshold value, the auxiliary drive is switched off.

From the document DE 195 40 620 A1 , in particular 2 , Pinch protection for auxiliary door leaves with a gear unit (which can be switched on and off an auxiliary power drive) is also known. This device has a coupling which comprises a drive element, an output element and an elastic driver element, to which a sensor unit with a computer element is assigned. The drive element can be driven by the auxiliary drive and the elastic driver element is connected on the one hand to the drive element and on the other hand to the driven element, so that a movement generated by the auxiliary drive and transmitted to the drive element with play on the driven element and thus on the sliding or pivoting wing is transmitted. The sensor unit with the computer element determines a measured value for a relative displacement of the drive element and the drive element and switches off the auxiliary power drive in the event of a deviation from a predetermined threshold value.

The one in the FR 2 564 971 A1 The mentioned anti-trap protection requires the accommodation of one of the two sensor elements in the sealing strip of the window frame. In addition, due to its location, this sensor element is exposed to harmful external influences such as temperature and humidity, which can lead to age-related wear more quickly.

It is therefore an object of the invention to provide anti-trap protection of the type mentioned here, with the parts of the sensor unit not in the sealing strip of the window frame are accommodated.

The object is achieved by a pinch protection with the features of claim 1 solved.

Advantageous advanced training courses go from the subclaims out.

A preferred embodiment of the invention is characterized in that the gear unit has a shaft, a drive pulley, a driven pulley, at least one drive spring and a mechanical transmitter, and the sensor unit has at least one drive pulley sensor, at least one driven pulley sensor and a computer element, the shaft being from can be driven by the auxiliary power drive, the drive disk having a drive side and a drive side on which the shaft is seated in a rotationally fixed manner, has at least one driver pin having an outer end and is provided with a plurality of projections in its peripheral region, the driven disk having a drive side and an output side has, does not sit non-rotatably on the shaft, has at least one through opening penetrated by the driver pin and is provided in its peripheral region with a plurality of projections, the driver spring on the The drive side of the driven pulley is connected at one end to the outer end of the driving pin and at the other end to the drive side of the driven pulley, so that a torque generated by the auxiliary drive and transmitted via the shaft to the drive pulley is transmitted to the driven pulley with play, wherein the mechanical transmitter transmits the rotation of the driven pulley to the sliding or swivel wing for the displacement or pivoting thereof, wherein the drive pulley sensor detects the number of passing projections of the drive pulley when the drive pulley rotates, the driven pulley sensor detects the number of traversing passes when the driven pulley rotates Protrusions of the drive pulley are detected, and wherein the computer element determines the offset between the number of protrusions of the drive pulley and the driven pulley passing by and switches off the auxiliary drive in the event of a deviation from a predetermined offset.

Offset means in the course of here described technical teaching the difference from the number of while the entire running phase of the drive pulley sensor projections the drive pulley and the number of in the same period protrusions of the driven pulley sensor Driven pulley.

The pinch protection according to the invention works as follows: Should an open Sliding or swivel wing be closed, so is first to turn on the auxiliary drive. One of the auxiliary drive Torque generated is applied to the shaft and from the shaft to the Transfer the drive pulley. This causes the drive pulley to rotate. On the Driver pin and the driver spring also becomes the driven pulley set in rotation. The rotation of the driven pulley is over the mechanical transformer in a sliding or pivoting movement to close the Sliding or swivel wing converted. As long as this movement is not inhibited, the drive disk sensor detects and the driven pulley sensor between the drive pulley and the driven pulley has a fixed offset. If the shift or pivoting movement, for example through a body part inhibited, the rotation of the driven pulley and finally comes completely to a standstill. Because of the different speeds of rotation the drive pulley and the driven pulley differ from those of the two Sensors detected Offset from a given offset. The calculator link provides this deviation fixed and then switches the auxiliary drive from.

With the pinch protection according to the invention the placement of a sensor in the sealing strip of the window frame unnecessary. All Rather, the anti-trapping components can be compact Design in the vehicle, which is why harmful external influences have no effect can unfold.

The principle of the invention is described in the above-mentioned embodiment realized in that a drive pulley can be rotated is relative to a spring-coupled driven pulley. The same Pinch protection leaves However, it can also be achieved if the auxiliary drive is not a torque, but is available as a translational force. In this embodiment is the driving force by means of a drive rail with spring play transferred to a drive rail, wherein the sensor has an offset between linearly arranged projections or Marks on the rails.

The training of the Auxiliary drive as an electric motor, since the latter is an industrially common and known drive means in all its technical properties represents.

It is also an advantage if the drive pulley and driven pulley as gears, preferably as spur gears, are trained. The tabs the drive pulley and the driven pulley correspond in this embodiment teeth of the gears. The advantage here is that gears in all their technical Properties of known bulk goods and therefore easy to handle are.

There are different possibilities, to train the two sensors. In practice as particularly suitable has proven itself when the drive pulley sensor and the driven pulley sensor in each case one field generator element generating a magnetic field and each include a Hall probe. This is always useful when the Projections of the Drive pulley and the driven pulley made of magnetic material consist. The detection of the offset works with this training of the two sensors as follows: The two generating the magnetic field Field generator elements are arranged in the area of the projections, that itself between the ledges and the field generating elements can each build up a magnetic field. A Hall probe is placed in each magnetic field. Will the drive pulley or if the driven pulley rotates, the strength of the Magnetic field periodically dependent of whether a protrusion or a gap between two neighboring ones projections opposite the field generating element is located.

The fluctuations in the strength of the Magnetic field are determined by the Hall probes. From the fluctuations of strength of the magnetic field is the number of sensors that pass the sensors projections determined and forwarded to the computer element.

The determination is particularly easy the number of protrusions passing the sensors, if the ledges the drive pulley and the driven pulley at regular intervals via the Distributed peripheral areas of the drive pulley and the driven pulley are.

Can be determined easily the direction of rotation of the drive pulley when two drive pulley sensors are provided in the circumferential direction of the drive pulley or seen the drive pulley by half the distance between two neighboring projections are offset from each other. Depending on the direction of rotation of the drive pulley receive that In this embodiment, the computer element initially has a signal from the first Drive disk sensor and then from the second drive disk sensor or vice versa, from which it depends on the direction of rotation of the drive pulley or close the driven pulley can.

The one generated by the auxiliary power drive Torque can be transmitted to the shaft in various ways. An embodiment has proven itself in practice in which an input gear is seated on the shaft in a rotationally fixed manner and is driven by the auxiliary power drive via a worm gear.

Also for the design of the mechanical transmitter there are different options. In practice it is valued for its structural simplicity, if the mechanical transmitter as sitting on the shaft, non-rotatably with the drive pulley connected and coupled in its peripheral region with a lifting arm Double disc is formed, wherein the lifting arm moves the sliding or swivel wing or panned.

The response time of the pinch protection can be shorten, if the driver spring is pre-tensioned before switching on the auxiliary drive is. The preload of the driver spring should be selected so that she by the weight of the sliding or swivel wing and the forces caused by friction balances.

Due to the aging of the pinch protection and additional frictional forces that increase the response time of the pinch protection can be compensated are assigned to the computer element, a memory in which a plurality of predetermined offset values are stored. Every single one of the predetermined offset values. chosen such that it depends on a particular Use the anti-trap protection to compensate for the additional response time can.

An embodiment of the pinch protection according to the invention is explained below with reference to the drawing. It shows:

1 1 shows an exemplary embodiment of a pinch protection according to the invention in a schematic illustration,

2 a component of the embodiment of the 1 in a front view and

3 an enlarged section of the 1 demonstrate.

The 1 contains a schematic representation of an embodiment of a pinch protection according to the invention 10 , Pinch protection 10 is used to move a (not shown) movable window pane of a vehicle.

Pinch protection 10 consists of two interacting functional units, namely a gear unit 2 and a sensor unit 4 , together. The latter is in 1 from a dashed line 6 enclosed. Everyone else, in 1 not from the dashed line 6 enclosed areas of the pinch protection 10 are the gear unit 2 assigned.

Based on 1 and 2 will be the gear unit first 2 of the pinch protection 10 described.

Pinch protection 10 has a shaft as a centrally arranged element 12 on. On the wave 12 sits an input gear 14 rotatable on. The input gear 14 is as a spur gear 16 trained that via a worm gear 18 with one as an electric motor 20 trained auxiliary drive 22 is coupled. The auxiliary drive 22 generates a torque that is via the worm gear 18 and the input gear 14 on the wave 12 is transmitted.

Of course, the torque from the auxiliary drive 22 on the wave 12 can also be transmitted by means of other types of gears, for example chain drives, belt drives and the like. Other forms of auxiliary drive 22 , for example as a pneumatic or hydraulic drive, are conceivable.

On the wave 12 is also a drive pulley 24 arranged. The drive pulley 24 sits rotatably on the shaft 12 on, that is, in the event that a torque in the pinch protection 10 is coupled in are the shaft 12 and the drive pulley 24 together in rotation. The drive pulley 24 has a drive side 26 and an output side 28 on. The drive side 26 the drive pulley 24 points in 1 to the left of the drive pulley 24 in the space between the drive pulley 24 and the input gear 14 enclosed space. The driven side 28 the drive pulley 24 points in 1 to the right of the drive pulley 24 located space. The drive pulley 24 is as a spur gear 30 trained that in its peripheral area 32 with a variety of as teeth 34 trained projections 36 is provided. The teeth 34 consist preferably of ferromagnetic material, for example of a gear made of iron, but other magnetic materials can also be used as markings.

Also sits on the wave 12 a drive pulley 38 on. The driven pulley 38 is to the driven side 28 the drive pulley 24 arranged pointing. The driven pulley 38 does not sit rotatably on the shaft 12 on, that is, one by the wave 12 in the pinch protection 10 Coupled torque is not directly from the shaft 12 on the driven pulley 38 transfer. The drive pulley 38 has a drive side 40 and an output side 42 on. The drive side 40 the drive pulley 38 points in 1 to the left of the driven pulley 38 located space, hence to the drive side 28 the drive pulley 24 , The drive side 42 points in 1 to the right of the driven pulley 38 located space. The drive pulley 24 is as a spur gear 31 trained that in its peripheral area 33 with a variety of as teeth 35 trained projections 37 is provided. The teeth 35 in this embodiment also consist of fer romagnetic material.

The description of the drive pulley 24 and the driven pulley 38 makes it clear that both are equally trained. It should be noted that unequal designs for the drive pulley 24 and the driven pulley 38 provided that the projections or markings on the drive pulley have the same angle scale as the corresponding projections or markings on the driven pulley. The corresponding angle scaling means the respective sequence of increases in the angle of rotation from marking to marking.

The drive pulley 24 points on their drive side 28 two driver pins 44 on. The driver pins 44 are cylindrical, one-story the drive side 28 the drive pulley 24 molded and each have an outer end 48 on. The driver pins 44 extend substantially perpendicularly from the driven side 28 the drive pulley 24 away and reach through one each in the drive pulley 38 arranged access opening 46 ,

As in 2 you can see the through openings 46 in the drive pulley 38 arranged opposite each other. The access openings 46 are like oblong holes 50 formed, which extend along an imaginary circular line. At its outer end 48 are the driver pins 44 each with one end 54 a catch spring 56 connected. The driver springs 56 are designed as mechanical return springs. With its end 54 opposite end 58 are the driver springs 56 each with the driven side 42 the driven pulley 38 connected.

Will the in 2 through the drive pulley 38 concealed drive pulley 24 through the wave 12 clockwise rotation (arrow 60 ) is moved over the driver pins 44 and the driver springs 56 a torque on the drive pulley 38 transferred so that the driven pulley 38 clockwise rotation begins.

1 also shows one on the wave 12 mounted mechanical transformer 62 , The mechanical transmitter 62 does not sit rotatably on the shaft 12 on. It is rather about connecting bridges 64 with the drive pulley 38 connected so that rotation of the drive pulley 38 in one rotation of the mechanical transmitter 62 results. The mechanical transmitter 62 is as a first disc 66 and a second disc 68 comprehensive double pane 70 educated. On the second disc 70 A lifting arm is articulated eccentrically 72 , The lifting arm 72 is about a pivot axis 74 can be given away in a plane that is at right angles to the drawing plane (double arrow 76 ). Due to the eccentric linkage, the mechanical transmitter turns 62 into a translational movement (double arrow 78 ) of the lifting arm 72 converted. The lifting arm 72 is on its the mechanical transformer 62 opposite end 80 connected to the (not shown) movable window pane of the vehicle.

Regarding 3 is the sensor unit below 4 of the pinch protection according to the invention 10 described.

The sensor unit 4 includes two traction sheave sensors 82 . 84 and two output disk sensors 86 . 88 ,

The drive disc sensors 82 . 84 are each the drive pulley 24 arranged opposite each other. They each have a field generator element 89 . 91 on. Between the field generator elements 89 . 91 on the one hand and in the peripheral area 32 teeth 34 the drive pulley 24 on the other hand, there is a magnetic field M indicated by vertical hatching.

The output disk sensors 86 . 88 are each the drive pulley 38 arranged opposite each other. They each include a field generator element 93 . 95 , In the same way as for the drive disc sensors 82 . 84 is located between the field generator elements 93 . 95 on the one hand and in the peripheral area 33 teeth 35 the driven pulley 38 on the other hand, a magnetic field M indicated by vertical hatching

The two drive disc sensors 82 . 84 are in line with the drawing plane and the wave 12 vertically extending plane against each other by half the distance between two adjacent teeth 34 the drive pulley 24 added. The two driven pulley sensors are in the same way 86 . 88 against each other by half the distance between two adjacent teeth 35 the driven pulley 38 added.

The two drive disc sensors 82 . 84 are two magnetic field probes each 90 . 92 and the two output disk sensors 86 . 88 two magnetic field probes each 94 . 96 assigned. The magnetic field probes 90 . 92 . 94 . 96 are designed as Hall probes. The magnetic field probes 90 . 92 respectively. 94, 96 are each arranged such that the magnetic field M between the teeth 34 the drive pulley 24 and the drive pulley sensors 82 . 84 or between the teeth 35 the drive disc 38 and the output disk sensors 86 . 88 can be grasped by them.

The drive disc sensors 82 . 84 and the output disk sensors 86 . 88 are over lines 102 with a calculator element 98 connected. The computer link is in turn with the auxiliary drive 22 over a line 104 in connection.

The calculator link 98 includes a memory 100 , A plurality of predetermined offsets are stored in the memory.

The one in the 1 to 3 described anti-trap protection 10 works as described below.

If an open sliding or swivel wing is to be closed, the auxiliary power drive is first 22 to turn. One from the assistant drive 22 Torque is generated on the shaft 12 and from the wave 12 on the drive pulley 24 transfer. The drive pulley 24 this will set it in rotation. About the driver pins 44 and the driver springs 56 will also be the drive pulley 38 set in rotation. The rotation of the drive disc 38 is via the mechanical transmitter 62 converted into a sliding or pivoting movement to close the sliding or pivoting wing.

As long as this movement is not inhibited, the drive disk sensors record 82 . 84 and the output disk sensors 86 . 88 between the drive pulley 24 and the driven pulley 38 little or no offset. The wheel 38 follows the wheel essentially synchronously 24 , The offset is so small that the sensors 82 . 84 count as many teeth as the sensors 86 . 88 ,

If the displacement or pivoting movement is now inhibited, for example by a part of the body, the rotation of the drive disk slows down 38 first and finally comes to a complete standstill. Due to the different speeds of rotation of the drive pulley 24 and the drive pulley 38 the offset detected by the sensors deviates from one in the memory 100 of the computer element 98 stored offset. The calculator link 98 detects this deviation and then switches the auxiliary drive 22 from.

A closer look at the pinching process causes a typical obstacle to increase the pinching force, starting at zero at the point of contact. Because the driving force is greater than the pinching force, the drive disc sensors count 82 . 84 the teeth continue unimpeded. The drive disc 38 no longer turns synchronously, but remains behind with increasing pinching force. Thus through the sensors 86 . 88 Fewer teeth recorded, ie the difference between the teeth counted in each case increases. If the difference exceeds a limit, the auxiliary drive is switched off or even reversed.

When starting the auxiliary drive can stiction of the sliding or swivel wing occur, that act like a trapped obstacle. This stiction can neglected, for example be by the while The offset occurring in the start phase of approximately 200 ms duration was not evaluated becomes. However, the offset occurring in the start phase could can also be used to prevent false tripping of the auxiliary drive eliminate. For example an accidental touch a release button lead to a certain offset, which was subsequently undone by reversing the auxiliary drive will while a lasting touch the release button initial Overcoming inhibition.

When starting the system are also acceleration forces effective from the inert mass of the moving parts result. These forces can lead to a too high offset (and thus stopping) to avoid in the early stages by a gentle starting of the power drive can be kept small. For example can perform the performance of an electric motor used as an auxiliary drive Pulse width modulation of the supplied Energy can be dosed.

Finally, it should be noted that the use of the Pinch protection according to the invention is not limited to sliding or swivel wings in vehicles, but with any type of auxiliary sliding or pivoting sash Use can come.

2

gear unit

4

sensor unit

6

dashed line

10

pinch

12

wave

14

input gear

16

spur gear

18

worm gear

20

electric motor

22

Auxiliary power drive

24

sheave

26

Drive side of 24

28

Drive side of 24

30

spur gear

31

spur gear

32

peripheral region

33

peripheral region

34

teeth

35

teeth

36

projections

37

projections

38

sheave

40

Drive side of 38

42

Output side of 38

44

driver pin

46

Through opening

48

outer end of 44

50

slots

54

an end of 56

56

driver spring

58

other end of 56

60

arrow

62

mechanical transformer

64

connecting webs

66

first disc

68

second disc

70

double glazing

72

lifting arm

74

swivel axis

76

double arrow

78

double arrow

80

an end of 72

82

Sheave sensor

84

Sheave sensor

M

magnetic field

86

Driven pulley sensor

88

Driven pulley sensor

89

Field generating element

90

magnetic field probe

91

Field generating element

92

magnetic field probe

93

Field generating element

94

magnetic field probe

95

Field generating element

96

magnetic field probe

98

computer link

100

Storage

102

cables

104

management

Claims (18)

Pinch protection ( 10 ) for auxiliary power operated sliding or swivel sashes, in particular for movable window panes and pivoting flaps in vehicles, with an auxiliary power drive that can be switched on and off ( 22 ) having gear unit ( 2 ) in which a sensor unit ( 4 ) with a computer element ( 98 ) a measured value for a relative displacement of a drive element and a drive element is determined and wherein the sensor unit ( 4 ) in the event of a deviation from a predetermined threshold value, the auxiliary power drive ( 22 ) switches off, characterized in that the gear unit ( 2 ) comprises an elastic driver element in addition to the drive element and the output element, the drive element being driven by the auxiliary power drive ( 22 ) can be driven and the elastic driver element is connected on the one hand to the drive element and on the other hand to the driven element, so that one of the auxiliary drive ( 22 ) movement generated and transmitted to the drive element is transmitted with play to the driven element and thus to the sliding or pivoting wing, and that the sensor unit ( 4 ) next to the calculator element ( 98 ) at least one drive sensor ( 82 . 84 ) and at least one output sensor ( 86 . 88 ) having. Pinch protection ( 10 ) according to claim 1, characterized in that the drive element is provided with a plurality of markings in its direction of movement and the output element is provided with a plurality of markings in its direction of movement. Pinch protection ( 10 ) according to claim 2, characterized in that the drive sensor ( 82 . 84 ) the movement of the drive element detects the number of passing markings of the drive element and the drive sensor ( 86 . 88 ) detects the number of passing markings of the driven element when the driven element moves. Pinch protection ( 10 ) according to claim 2 or 3, characterized in that the computer element ( 98 ) determines an offset between the number of passing markings of the drive element and the output element as the measured value and, in the event of a deviation from a predetermined offset value, the auxiliary power drive ( 22 ) switches off. Pinch protection according to one of the preceding claims, characterized in that the gear unit ( 2 ) comprises a drive rail, a drive rail and at least one driver spring forming the elastic driver element and the sensor unit ( 4 ) at least one the drive sensor ( 82 . 84 ) forming drive rail sensor, at least one the drive sensor ( 86 . 88 ) forming output rail sensor and the computer element ( 98 ) having. Pinch protection according to claim 5, characterized in that the drive rail from the auxiliary power drive ( 22 ) can be driven and has at least one driver pin having an outer end and is provided with a plurality of projections as markings in the direction of movement of the driver pin, the output rail having at least one through opening penetrated by the outer end of the driver pin and with a plurality in the direction of movement of the driver pin is provided by projections as markings, the driver spring being connected on the one hand to the outer end of the driver pin and on the other hand to the output rail. Pinch protection ( 10 ) according to one of claims 1 to 4, characterized in that the gear unit ( 2 ) a wave ( 12 ), a drive pulley ( 24 ), a driven pulley ( 38 ), at least one driver spring ( 56 ) and a mechanical transformer ( 62 ) and the sensor unit ( 4 ) at least one the drive sensor ( 82 . 84 ) forming the drive disk sensor, at least one of the drive sensor ( 86 . 88 ) forming output disk sensor and the computer element ( 98 ) having. Pinch protection ( 10 ) according to claim 7, characterized in that the shaft ( 12 ) from the auxiliary power drive ( 22 ) can be driven, the drive pulley ( 24 ) a drive side ( 26 ) and a drive side ( 28 ) on which the wave ( 12 ) rotatably and at least one outer end ( 48 ) driving pin ( 44 ) and in its peripheral area ( 32 ) with a variety of protrusions ( 36 ) is provided as a mark, the driven pulley ( 38 ) a drive side ( 40 ) and an output side ( 42 ) on which the shaft ( 12 ) does not sit firmly against rotation, and at least one from the driver pin ( 44 ) penetrated through opening ( 46 ) and in its peripheral area ( 33 ) with a variety of protrusions ( 37 ) is provided as a marker. Pinch protection according to claim 8, characterized in that the driver spring ( 56 ) on the output side ( 42 ) the drive pulley ( 38 ) at one end ( 54 ) with the outer end ( 48 ) of the driver pin ( 44 ) and at its other end ( 58 ) with the driven side ( 42 ) of the driven pulley ( 38 ) is connected, so that one of the auxiliary drive ( 22 ) generated and via the wave ( 12 ) on the drive pulley ( 24 ) Torque transmitted to the driven pulley with play ( 38 ) is transmitted, the mechanical transmitter ( 62 ) the rotation of the driven pulley ( 38 ) transfers to the sliding or swivel wing for its displacement or pivoting. Pinch protection according to one of the preceding claims, characterized in that the auxiliary power drive ( 22 ) as an electric motor ( 20 ) is trained. Pinch protection according to one of claims 7 to 10, characterized in that the drive disc ( 24 ) and the driven pulley ( 38 ) as gears, preferably as spur gears ( 30 . 31 ) are trained. Pinch protection according to one of claims 8 to 11, characterized in that the drive disk sensor and the driven disk sensor each have a field generator element (M) which generates a magnetic field (M). 89 . 91 . 93 . 95 ) and a magnetic field probe designed as a Hall probe ( 90 . 92 . 94 . 96 ) and the projections ( 36 . 37 ) the drive pulley ( 24 ) and the driven pulley ( 38 ) consist of magnetic material. Pinch protection according to one of claims 8 to 12, characterized in that the projections ( 36 . 37 ) the drive pulley ( 24 ) and the driven pulley ( 38 ) at regular intervals over the circumferential areas ( 32 . 33 ) the drive pulley ( 24 ) and the driven pulley ( 38 ) are distributed. Anti-trap protection according to one of Claims 8 to 13, characterized in that two drive disk sensors are provided which, in the circumferential direction of the drive disk ( 24 ) or the driven pulley ( 38 ) seen by half the distance between two adjacent projections ( 36 . 37 ) are offset from each other. Pinch protection according to one of claims 7 to 14, characterized in that on the shaft ( 12 ) an input gear ( 14 ) non-rotatably, which via a worm gear ( 18 ) from the auxiliary power drive ( 22 ) is driven. Pinch protection according to one of claims 7 to 15, characterized in that the mechanical transmitter ( 62 ) than on the wave ( 12 ) seated, non-rotatable with the driven pulley ( 38 ) connected and in its peripheral area with a lifting arm ( 72 ) coupled double disc ( 70 ) is formed, the lifting arm ( 72 ) shifts or swivels the sliding or swivel wing. Pinch protection according to one of the preceding claims, characterized in that the elastic driver element before switching on the auxiliary power drive ( 22 ) is biased. Pinch protection according to one of the preceding claims, characterized in that the computer element ( 98 ) a memory ( 100 ) is assigned in which a plurality of predetermined offset values are stored.