DE102018213294B4 - Belt retractor - Google Patents

Abstract

Belt retractor (10) for a seat belt (20) with a belt reel (11) for winding and unwinding the seat belt (20) and a torque generating device (12) for generating a torque on the belt reel (11) in the belt winding direction, with the The belt retractor (10) has an intermediate reel (13), which is arranged upstream of the belt reel (11) - related to the belt webbing - and has a through slot (13a), - the seat belt (20) is guided through the through slot (13a) and from the through slot ( 13a) into a first belt webbing section (A1), which is located between the belt reel (11) and the intermediate reel (13), and a second belt webbing section (A2), which is arranged upstream of the intermediate reel (13), and the intermediate reel ( 13) is coupled or can be coupled to a drive (14) which can rotate the intermediate reel (13) and thereby wind the webbing of the first and second webbing sections (A1, A2) onto the intermediate reel (13), since characterized in that - the intermediate spool (13) has a predetermined basic position in which the belt strap passes through the passage slot (13a) without being wound and in which the intermediate spool (13) for the seat belt (20) is thus inactive, - the belt retractor (10) a sensor (60) which can detect the worn and / or non-worn state of the seat belt (20) and generates a seat belt signal (S) when the seat belt (20) is brought from the non-worn state to the worn state, - the drive ( 14) is designed in such a way or controlled by means of a control device (15) in such a way that after the seat belt (20) has been fastened and the seat belt signal (S) is present, it switches to a buckle optimization mode, the drive (14) in the buckle optimization mode, the intermediate coil (13) rotates from a predetermined basic position to a predetermined limited extent, thereby slack in the second strap section (A2 ) is eliminated or at least reduced and the film reel effect on the belt reel (11) is eliminated or at least reduced, and then the intermediate reel (13) is rotated back into the predetermined basic position, whereby the latch optimization mode of the drive (14) is completed, and - the belt reel ( 11) the belt strap unwound as a result when the intermediate reel (13) is turned back - driven by the torque generating device (12) - winds up.

Description

The invention relates to a belt retractor for a seat belt with a belt reel for winding and unwinding the seat belt and a torque generating device for generating a torque on the belt reel in the belt winding direction.

Such belt retractors with belt reels and torque generating devices are for example from the laid-open specification DE 10 2016 211 886 A1 known.

In the case of belt retractors, the problem can arise that after the seat belt has been put on, the belt strap is only loosely attached, so so-called belt slack occurs, which can impair the function of the seat belt. In addition, a film reel effect can occur on the belt reel if the belt strap is not wound tightly on the belt reel. The film reel effect can delay the tightening of the seat belt, for example in a dangerous situation.

From the German patent specification DE 37 83 494 T2 a seat belt tensioner device for eliminating play in a seat belt by automatically retracting the seat belt is known. Such a seat belt tensioner in combination with a belt reel would correspond to a belt retractor with the features according to the preamble of claim 1.

The invention is based on the object of specifying a different belt retractor in which the above-described problems of the occurrence of belt slack and the film reel effect are eliminated or at least reduced.

This object is achieved according to the invention by a belt retractor with the features according to claim 1 or by a vehicle seat with the features according to claim 12. Advantageous embodiments of the belt retractor according to the invention are specified in the dependent claims.

A significant advantage of the belt retractor according to the invention is that the intermediate reel additionally provided according to the invention with the through slot provided according to the invention enables a fastening optimization operation after the seat belt has been put on, in which, by turning the intermediate reel, any belt slack and any existing film reel effect is at least reduced and the safety effect of the seat belt is thus increased.

The rotation, in particular from the stated basic position, is preferably carried out only to a predetermined limited extent, namely preferably only to the extent that belt slack in the second belt webbing section is eliminated or at least reduced and the film reel effect on the belt reel is eliminated or at least reduced. The specified limited dimension can be specified, for example, in the form of a maximum torque, a maximum belt winding length, a maximum speed of the intermediate spool or a maximum angle of rotation of the intermediate spool.

The drive then turns the intermediate bobbin back into the specified basic position. When the intermediate reel is turned back, the belt reel winds up the belt strap unwound as a result - driven by the torque generating device.

The drive is preferably designed in such a way or is preferably controlled by means of a control device in such a way that, when the seat belt signal is present, it rotates the intermediate coil until a predetermined maximum torque is reached.

The maximum torque is preferably limited in size to eliminate or at least reduce belt slack in the second belt webbing section and to eliminate or at least reduce the film reel effect on the belt reel.

The intermediate spool preferably has a predetermined basic position in which the belt strap passes through the passage slot unwound, preferably in a straight line, and in which the intermediate spool for the seat belt is thus inactive.

The drive is preferably a reversible electric drive.

The belt retractor preferably has a locking device which locks the belt reel in the belt unwinding direction in the event of an abrupt belt extension.

The locking device can preferably be deactivated and, when a release signal is present, preferably enables the seat belt to be unwound from the belt reel, which in turn allows the intermediate reel to unroll belt webbing from the belt reel.

As an alternative or in addition to this locking device, there may be another webbing pull-out locking device which, in normal operation, blocks an abrupt unwinding of the webbing. If this webbing pull-out locking device is arranged in the first webbing section, it can preferably be deactivated in order to connect the intermediate reel to enable abrupt tightening of the belt strap, for example in the case of activation of a tensioner drive acting on the intermediate spool.

• Im Anschnalloptimierungsbetrieb führt der Antrieb vorzugsweise jeweils zwei Verfahrensschritte durch, wobei er in einem ersten Verfahrensschritt - nach Vorliegen eines Anschnallsignals - die Zwischenspule in einem vorgegebenen Maße dreht,
• und zwar vorzugsweise nur soweit, dass Gurtlose im zweiten Gurtbandabschnitt eliminiert oder zumindest reduziert wird und der Filmspuleneffekt auf der Gurtspule eliminiert oder
• zumindest reduziert wird, und nachfolgend in einem zweiten Verfahrensschritt die Zwischenspule wieder in ihre Grundstellung zurückdreht.

It is particularly advantageous if the belt retractor enables a buckle optimization mode and a tensioner mode:

• In the buckle optimization mode, the drive preferably carries out two process steps each, whereby in a first process step - after a buckle signal is available - it rotates the intermediate spool to a predetermined extent,
• and preferably only to the extent that belt slack in the second belt webbing section is eliminated or at least reduced and the film reel effect on the belt reel is eliminated or
• is at least reduced, and then in a second process step, the intermediate spool is rotated back into its basic position.

In tensioning mode - for example after the presence of a danger signal indicating a hazardous situation - the seat belt is preferably tightened beyond the predetermined amount.

The tightening operation can be carried out by the drive, for example after the danger signal is present.

It is also advantageous if the belt retractor has a second drive in addition to the drive mentioned. The second drive is preferably designed for tensioning operation for tensioning the seat belt. The second drive is preferably a pyrotechnic drive or an electric drive.

The second drive is preferably coupled or can be coupled to the intermediate coil.

Alternatively and likewise advantageously, the second drive can be coupled or can be coupled to the belt reel and carry out the tensioning operation for tensioning the seat belt by driving the belt reel.

In the last-mentioned variant in particular, it is advantageous if there is a locking device that locks the belt reel in the belt unwinding direction when the belt is pulled out abruptly, but can be deactivated and allows the seat belt to unroll after deactivation, in particular to enable the buckle optimization mode and / or the tensioner drive.

A belt deflection device is preferably arranged between the intermediate reel and the belt reel, in particular with a view to optimizing the installation within a vehicle seat.

The invention also relates to a vehicle seat with a belt retractor as has been described above. With regard to the advantages of the vehicle seat according to the invention, reference is made to the above statements in connection with the belt retractor according to the invention.

• 1 ein erstes Ausführungsbeispiel für eine erfindungsgemäße Gurtaufrolleinrichtung, wobei die 1 die Grundstellung einer Zwischenspule der Gurtaufrolleinrichtung darstellt,
• 2 die Gurtaufrolleinrichtung gemäß 1 nach einer Rotation der Zwischenspule und einem Aufwickeln von Gurtband auf der Zwischenspule,
• 3 ein zweites Ausführungsbeispiel für eine erfindungsgemäße Gurtaufrolleinrichtung, bei der ein Antrieb der Gurtaufrolleinrichtung von einer Steuereinrichtung angesteuert wird,
• 4 ein drittes Ausführungsbeispiel für eine erfindungsgemäße Gurtaufrolleinrichtung, die zusätzlich zu dem Antrieb, der zur Durchführung des Anschnalloptimierungsbetriebs dient, einen Strafferantrieb aufweist,
• 5 ein viertes Ausführungsbeispiel für eine erfindungsgemäße Gurtaufrolleinrichtung, bei der ein Sensor zum Detektieren eines Anschnallvorgangs im Bereich der Gurtspule der Gurtaufrolleinrichtung angeordnet ist,
• 6 ein erstes Ausführungsbeispiel für einen erfindungsgemäßen Fahrzeugsitz, der mit einem Ausführungsbeispiel für eine erfindungsgemäße Gurtaufrolleinrichtung ausgestattet ist, wobei bei dem Ausführungsbeispiel gemäß der 6 sowohl die Gurtspule als auch die Zwischenspule der Gurtaufrolleinrichtung in einer Rückenlehne des Fahrzeugsitzes angeordnet sind,
• 7 ein zweites Ausführungsbeispiel für einen erfindungsgemäßen Fahrzeugsitz, der mit einem Ausführungsbeispiel für eine erfindungsgemäße Gurtaufrolleinrichtung ausgestattet ist, wobei bei dem Ausführungsbeispiel gemäß 7 zwischen der Zwischenspule und der Gurtspule der Gurtaufrolleinrichtung ein Umlenkelement angeordnet ist, und
• 8 ein drittes Ausführungsbeispiel für einen erfindungsgemäßen Fahrzeugsitz, der mit einem Ausführungsbeispiel für eine erfindungsgemäße Gurtaufrolleinrichtung ausgestattet ist, wobei bei dem Ausführungsbeispiel gemäß 8 die Zwischenspule in der Rückenlehne und die Gurtspule im Sitzelement des Fahrzeugsitzes angeordnet ist und ein Umlenkelement im Bereich zwischen Rückenlehne und Sitzelement angeordnet ist.

The invention is explained in more detail below on the basis of exemplary embodiments; show by way of example

• 1 a first embodiment of a belt retractor according to the invention, wherein the 1 represents the basic position of an intermediate spool of the belt retractor,
• 2 the belt retractor according to 1 after a rotation of the intermediate reel and a winding of the webbing on the intermediate reel,
• 3 a second embodiment of a belt retractor according to the invention, in which a drive of the belt retractor is controlled by a control device,
• 4th a third embodiment for a belt retractor according to the invention, which has a tensioner drive in addition to the drive that is used to carry out the strap optimization mode,
• 5 a fourth embodiment for a belt retractor according to the invention, in which a sensor for detecting a buckling process is arranged in the region of the belt reel of the belt retractor,
• 6th a first embodiment of a vehicle seat according to the invention, which with an embodiment for a Belt retractor according to the invention is equipped, wherein in the embodiment according to 6th both the belt reel and the intermediate reel of the belt retractor are arranged in a backrest of the vehicle seat,
• 7th a second embodiment for a vehicle seat according to the invention, which is equipped with an embodiment for a belt retractor according to the invention, wherein in the embodiment according to 7th a deflection element is arranged between the intermediate reel and the belt reel of the belt retractor, and
• 8th a third embodiment for a vehicle seat according to the invention, which is equipped with an embodiment for a belt retractor according to the invention, wherein in the embodiment according to FIG 8th the intermediate reel is arranged in the backrest and the belt reel is arranged in the seat element of the vehicle seat and a deflection element is arranged in the area between the backrest and the seat element.

For the sake of clarity, the same reference symbols are always used in the figures for identical or comparable components.

The 1 shows a belt retractor 10 needing to retract a seat belt 20th suitable is. An end 21st the seat belt 20th is secured by means of a fastening device that is permanently mounted on the vehicle 30th held. The other end 22nd the seat belt 20th is on a belt reel 11 the belt retractor 10 appropriate.

A torque generating device 12 the belt retractor 10 serves to generate a torque on the belt reel 11 in the belt winding direction, so that there is always a certain tensile force on the seat belt 20th in the belt winding direction of the belt reel 11 is exercised. The torque generating device 12 can for example be formed by a spring.

The belt reel 11 An intermediate spool is arranged upstream in relation to the webbing 13 the belt retractor 10 . The intermediate coil 13 has a through slot 13a on through which the seat belt 20th is passed through. The intermediate coil 13 or the through slot 13a the intermediate coil 13 divide the seat belt 20th into a section A1 that is between the belt reel 11 and the intermediate coil 13 and a second section of webbing A2 that of the intermediate coil 13 is upstream.

With the intermediate coil 13 coupled is a drive 14th the belt retractor 10 holding the intermediate coil 13 turn and thereby strap the first section A1 and the second webbing section A2 on the intermediate spool 13 can wind up.

On the seat belt 20th is a tongue 40 attached that in a seat belt buckle 50 can be introduced and locked there. The locked state of the belt buckle 50 is by means of a sensor 60 detects a corresponding seat belt signal S. generated.

• Sobald der Sensor 60 das Einrasten der Steckzunge 40 in das Gurtschloss 50 detektiert hat und das Anschnallsignal S erzeugt hat, schaltet der Antrieb 14 in einen Anschnalloptimierungsbetrieb; im Anschnalloptimierungsbetrieb wird der Antrieb 14 zwei Verfahrensschritte durchführen:
  • In einem ersten Verfahrensschritt wird der Antrieb 14 die Zwischenspule 13 in einem vorgegebenen Maße drehen, wodurch Gurtlose im zweiten Gurtbandabschnitt A2 eliminiert oder zumindest reduziert wird und der Filmspuleneffekt auf der Gurtspule 11 eliminiert oder zumindest reduziert wird. Von einer ausreichenden Reduktion von Gurtlose und Filmspuleneffekt kann der Antrieb 14 beispielsweise ausgehen, sobald er beim Drehen der Zwischenspule 13 ein vorgegebenes maximales Drehmoment erreicht hat.

The belt retractor 10 can be operated, for example, as follows:

• Once the sensor 60 the locking of the tongue 40 in the seat belt buckle 50 has detected and the seat belt signal S. the drive switches 14th into a latch optimization mode; In the latch optimization mode, the drive is 14th perform two procedural steps:
  • In a first step, the drive 14th the intermediate coil 13 rotate by a predetermined amount, causing slack in the second strap section A2 eliminated or at least reduced and the film reel effect on the belt reel 11 eliminated or at least reduced. The drive can benefit from a sufficient reduction in belt slack and film reel effect 14th for example go out as soon as he turns the intermediate coil 13 has reached a predetermined maximum torque.

The 2 shows the belt retractor 10 according to 1 after the first process step, i.e. after rotating the intermediate spool 13 along the direction of the arrow D1 in 1 . It can be seen that on the intermediate spool 13 Webbing from the first webbing section A1 and from the second webbing section A2 has been rolled up. When rolling up the first section of webbing A1 becomes a tensile force on the webbing section A1 exerted by the film reel effect on the belt reel 11 is reduced; when rolling up the second webbing section A2 belt slack is eliminated or at least reduced.

After completing the first process step, the drive 14th perform a second step in which he removes the intermediate coil 13 again in the in the 1 Turn back the basic position shown (see arrow direction D2 in 2 ) in which the seat belt 20th the through slot 13a unrolled, especially in a straight line. When turning back the intermediate spool 13 becomes webbing from the intermediate spool 13 unrolled and onto the belt reel 11 rolled up for this purpose by the torque generating device 12 is driven.

Once the intermediate coil 13 your in 1 has reached the basic position shown again, the latch optimization mode is completed.

The drive 14th is preferably a reversible electric drive, which can carry out the described buckle optimization operation as often as desired and is thus able to do so after each time the seat belt is put on 20th and whenever a seat belt signal is present S. carry out the described two process steps and reduce belt slack and film reel effect.

The 3 shows an embodiment of a belt retractor 10 where the drive 14th from a control device 15th is controlled. The control device 15th received from the sensor 60 the seat belt signal S. as soon as the tongue 40 in the seat belt buckle 50 has been introduced. In contrast to the exemplary embodiment according to FIGS 1 and 2 the drive works 14th so not automatically based on the seat belt signal S. , but under control by the additional control device 15th . Otherwise, the above statements apply in connection with the 1 and 2 for the embodiment according to 3 corresponding.

The 4th shows a further embodiment for a belt retractor 10 , which can carry out a buckle optimization to reduce belt slack and film reel effect after the seat belt has been put on, as is the case with the 1 to 3 has already been explained above. In contrast to the exemplary embodiments according to FIGS 1 to 3 is at the belt retractor 10 according to 4th an additional tensioner drive 16 provided, the tensioner operation of the belt retractor 10 enables. The additional tensioner drive forming a second drive 16 is preferably a pyrotechnic drive or an electric drive.

If a dangerous situation is determined by means of one or more further sensors (not shown) that requires additional tightening of the seat belt 20th makes necessary or at least advantageous, the tensioner drive 16 activated. The activated tensioner drive 16 tightens the seat belt 20th with a torque and a speed of rotation that are greater than the torque and speed of rotation of the drive 14th go far beyond and serve that with the seat belt 20th To bring the person wearing a seat belt into a specified sitting position. The tightening by the tensioner drive 16 in the tightening operation is thus far beyond the extent that the drive 14th generated as part of the optimization of the fastening.

The 5 shows an embodiment of a belt retractor 10 with a sensor 60 to determine whether the seat belt is fastened and / or not fastened 20th in the area of the belt reel 11 is arranged. The sensor 60 can in the embodiment according to 5 for example, unrolling and rolling up the seat belt 20th on the belt reel 11 observe and based on the winding and unwinding behavior of the belt reel 11 infer a seat belt operation that triggers a subsequent buckle optimization operation, as described above in connection with the 1 to 4th has been described.

The belt reel 11 has in the above embodiments according to 1 to 5 preferably a locking device 11a , for example in the form of a pawl, which is suitable for blocking the unwinding of the webbing in the event of an abrupt pull-out of the webbing. The locking device 11a is preferably deactivatable, so that it is possible for the fastening optimization described above or the tightening described above in the case of a dangerous situation of the belt strap from the belt reel 11 unroll and on the intermediate spool 13 to roll up without this by locking the belt reel 11 prevented or made more difficult.

The 6th shows an embodiment for a vehicle seat 100 with a belt retractor 10 Is provided. The belt retractor 10 can be configured, for example, as described above in connection with the 1 to 5 has been explained.

In the embodiment according to 6th all components of the belt retractor are located 10 , so both the belt reel 11 as well as the intermediate coil 13 , in a backrest 110 of the vehicle seat. Regarding the functioning of the belt retractor 10 refer to the above statements in connection with the 5 referenced.

The 7th shows an embodiment for a vehicle seat 100 , in which a belt retractor 10 with all its components - in accordance with the embodiment according to 6th - in the backrest 110 of the vehicle seat 100 are housed. In contrast to the exemplary embodiment according to FIG 6th has the belt retractor 10 according to 7th an additional deflection element 17th on that between the belt reel 11 and the intermediate coil 13 is arranged and a belt deflection in the area of the first strap section A1 performs. The additional deflection element allows a different spatial arrangement of the components of the belt retractor 10 , especially the belt reel 11 and the intermediate coil 13 , relative to each other.

Otherwise, the above statements apply in connection with the 1 to 6th in the embodiment according to 7th corresponding.

The 8th shows an embodiment for a vehicle seat 100 , for the components of a belt retractor 10 both in the backrest 110 as well as in a seat element 120 of the vehicle seat 100 are housed. In the embodiment according to 8th is the intermediate coil 13 the belt retractor 10 in the backrest 110 and the belt reel 11 the belt retractor 10 in the area of the seat element 120 . In the swivel range 130 between the backrest 110 and the seat element 120 there is a deflection element 17th , which is a deflection of the first strap section A1 the seat belt 20th in the area between the belt reel 11 and the intermediate coil 13 enables.

In the embodiment according to 8th So are the components of the belt retractor 10 throughout the vehicle seat 100 distributed, so both in the backrest 110 as well as in the seat element 120 .

In the embodiments according to 6th to 8th it is considered beneficial if the seat belt 20th through an upper slot 111 in the backrest 110 is introduced into this. At least the intermediate coil 13 and the drive 14th are preferably located in the area of the backrest 110 .

In the embodiments according to 6th to 8th are the fastening device 30th and the belt buckle, not shown, preferably on the vehicle seat 100 attached to, for example, rotating or sliding the vehicle seat 100 within the vehicle. Alternatively, the fastening device 30th and / or the belt lock can also be mounted elsewhere in the vehicle.

Although the invention has been illustrated and described in more detail by means of preferred exemplary embodiments, the invention is not restricted by the disclosed examples and other variations can be derived therefrom by the person skilled in the art without departing from the scope of protection of the invention.

List of reference symbols

10

Belt retractor

11

Belt reel

11a

Locking device

12

Torque generating device

13

Intermediate coil

13a

Through slot

14th

drive

15th

Control device

16

Tensioner drive

17th

Deflection element

20th

Seat belt

21st

The End

22nd

The End

30th

Fastening device

40

Tongue

50

Seat belt buckle

60

sensor

100

Vehicle seat

110

backrest

111

slot

120

Seating element

130

Swivel range

A1

Webbing section

A2

Webbing section

D1

Arrow direction

D2

Arrow direction

S.

Seat belt signal

Claims (12)

Belt retractor (10) for a seat belt (20) with - a belt reel (11) for winding and unwinding the seat belt (20) and - a torque generating device (12) for generating a torque on the belt reel (11) in the belt winding direction, with - the The belt retractor (10) has an intermediate reel (13), which is arranged upstream of the belt reel (11) - related to the belt webbing - and has a through slot (13a), - the seat belt (20) is guided through the through slot (13a) and from the through slot ( 13a) into a first belt webbing section (A1), which is located between the belt reel (11) and the intermediate reel (13), and a second belt webbing section (A2), which is arranged upstream of the intermediate reel (13), and - the intermediate reel ( 13) is coupled or can be coupled to a drive (14) which can rotate the intermediate reel (13) and thereby wind the webbing of the first and second webbing section (A1, A2) onto the intermediate reel (13) n, characterized in that - the intermediate spool (13) has a predetermined basic position in which the belt strap passes through the passage slot (13a) without being wound and in which the intermediate spool (13) for the seat belt (20) is therefore inactive, - the belt retractor ( 10) has a sensor (60) which can detect the worn and / or non-worn state of the seat belt (20) and generates a seat belt signal (S) when the seat belt (20) is brought from the non-worn state to the worn state, - the Drive (14) is designed or controlled by means of a control device (15) in such a way that after the seat belt (20) has been put on and when the seat belt signal (S) is present, it switches to a buckle optimization mode, the drive (14) in buckle optimization mode the intermediate spool (13) rotates from a predetermined basic position to a predetermined limited extent, thereby slack in the second Gurtbandabs cut (A2) eliminated or at least reduced and the film reel effect on the belt reel (11) eliminated or at least reduced, and then rotates the intermediate reel (13) back into the predetermined basic position, whereby the strap optimization mode of the drive (14) is completed, and - the belt reel (11) drives the belt strap unwound when the intermediate reel (13) is turned back from the torque generating device (12) - winds up. Belt retractor (10) Claim 1 , characterized in that the drive (14) is designed or controlled by a control device (15) in such a way that it returns the intermediate coil (13) to this basic position after the intermediate coil (13) has been rotated until a predetermined maximum torque is reached turns back. Belt retractor (10) Claim 2 , characterized in that the maximum torque is limited in size to eliminate or at least reduce belt slack in the second belt webbing section (A2) and to eliminate or at least reduce the film reel effect on the belt reel (11). Belt retractor (10) according to one of the preceding claims, characterized in that the drive (14) is designed or controlled by means of a control device (15) in such a way that, when the seat belt signal (S) is present, it reaches the intermediate coil (13) rotates a predetermined maximum torque. Belt retractor (10) according to one of the preceding claims, characterized in that the belt retractor (10) has a locking device (11a) which locks the belt reel (11) in the belt unwinding direction when the belt is pulled out abruptly. Belt retractor (10) Claim 5 , characterized in that the locking device (11a) can be deactivated and, when a release signal is present, allows the seat belt (20) to unroll from the belt reel (11) and the intermediate reel (13) enables belt webbing to be unwound from the belt reel (11). Belt retractor (10) according to one of the preceding claims, characterized in that the drive (14) is a reversibly operating electric drive. Belt retractor (10) according to one of the preceding claims, characterized in that - the belt retractor (10) enables a buckle optimization mode and a tensioning mode, - the drive (14) in each case performs two method steps in the buckle optimization mode, with a first method step - according to the present a seat belt signal (S) - the intermediate reel (13) rotates to a predetermined extent, to the extent that slack in the second belt webbing section (A2) is eliminated or at least reduced and the film reel effect on the belt reel (11) is eliminated or at least reduced, and subsequently, in a second process step, the intermediate spool (13) is turned back into its basic position, and - with the seat belt (20) being tightened beyond the specified amount in tensioning mode - after the presence of a danger signal indicating a dangerous situation. Belt retractor (10) according to one of the preceding claims, characterized in that - the tensioning operation - after the presence of the danger signal - is carried out by the drive (14) or - the belt retractor (10) has a second drive (14) in addition to the said drive (14). 16), which is coupled or can be coupled to the intermediate coil (13) and is designed to carry out the tensioning operation for tensioning the seat belt (20). Belt retractor (10) according to one of the Claims 5 to 9 , characterized in that a locking device (11a) is present, which locks the belt reel (11) in the belt unwinding direction when the belt webbing is pulled out abruptly, but can be deactivated and, after deactivation, allows the seat belt (20) to unroll, in particular to optimize the buckle operation and / or the To enable tensioner drive. Belt retractor (10) according to one of the preceding claims, a deflecting element (17) being arranged between the intermediate spool (13) and the belt spool (11). Vehicle seat (100) with a belt retractor (10) according to one of the preceding claims, wherein the intermediate spool (13) and the belt spool (11) are integrated in the vehicle seat (100).

Images