JPH061497Y2 - Webbing take-up device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used for a webbing retractor that winds up and accommodates occupant restraining webbings in layers, and particularly controls the winding force when the occupant wears the webbing. The present invention relates to a webbing retractor.

[Prior Art] In a winding device installed in a vehicle, a mainspring spring having a large urging force and a mainspring spring having a small urging force are connected in series to a winding shaft, and the urging force of the mainspring spring acts when the webbing is mounted. There is proposed a so-called tension reducer structure which prevents the above-mentioned phenomenon and acts only the urging force of the small mainspring (Japanese Utility Model Publication No. 60-44956).

With this winding device having the tension reducer structure, the webbing winding force is only the biasing force of the mainspring when the occupant is wearing the webbing, so that the webbing winding force (compression) applied to the occupant can be reduced. When the webbing is not attached, the webbing retracting force is applied with the biasing force of the large mainspring spring in addition to the biasing force of the small mainspring spring. On the contrary, when the webbing is wound up, there is no inconvenience that the webbing is stopped due to a reaction force such as friction during the winding up, and the webbing can be reliably wound up.

By the way, in the tension reducer structure, as described above, the urging force of the small mainspring spring is applied to the occupant even when the webbing is attached, and the applicant of the present invention rotates the take-up shaft in the webbing take-up direction when the webbing is attached. It has proposed a winding device having a so-called tension releaser structure capable of completely preventing the above. This is a structure that prevents the rotation of the winding shaft by engaging the pole lever with the latch gear that is fitted or frictionally engaged with the winding shaft. It does not cause any pressure and does not make passengers feel uncomfortable.

In this tension releaser structure, the webbing take-up prevention timing of the take-up shaft is linked with the engagement of the tongue plate and the buckle device as an example. The slack (slack) between the occupant and the webbing cannot be removed by preventing the webbing from being wound up immediately after the engagement.

In order to remove this slack, a pawl lever that engages with the latch gear to prevent rotation of the winding shaft (in some cases, only rotation of the webbing in the winding direction) is engaged with the tongue plate and the buckle device. A structure has been proposed in which the webbing is moved stepwise in accordance with the subsequent withdrawal and winding of the webbing.

This is performed by the following steps, for example.

The pole lever is held apart from the latch gear while the tongue plate and the buckle device are not engaged with each other.

When the tongue plate and the buckle device are engaged with each other, the pawl lever is biased in a direction to engage with the latch gear, but its movement is restricted at the first position by the restricting means such as the cam plate.

The webbing is wound around the winding shaft by the amount corresponding to the slack, and in response to this, the pole lever is held in the state immediately before being engaged with the latch gear (the second position).

The occupant and the webbing are in close contact with each other, and by pulling out the webbing a small amount (about 20 mm) from the occupant's abdomen or the like from this state, the pole lever is guided by the cam plate and engaged with the latch gear.

Thus, by engaging the pole lever with the latch gear step by step, it is possible to optimize the amount of webbing pulled out when the occupant is wearing the webbing.

[Problems to be Solved by the Invention] However, when the tension releaser is operated with the above-mentioned structure, there is no problem in normal operation, but for example, the take-up shaft is engaged after the tongue plate and the buckle device are engaged with each other. If a foreign material or the like gets into the surrounding area and a temporary catch occurs in the winding or drawing operation of the winding shaft, the amount of webbing drawn out (20 mm) shown in the above step will be exceeded and the pole lever will move to the latch gear at that point. In some cases, the webbing cannot be mounted while being engaged and the slack is surely removed. In order to prevent this, the withdrawal amount (20 mm) in the above may be increased, but if this withdrawal amount is increased, slack is promoted, and it cannot be increased in structure.

In consideration of the above facts, an object of the present invention is to provide a webbing retractor that can prevent the occupant from feeling pressure when the occupant is wearing the webbing and that does not cause excessive slack.

[Means for Solving Problems] A webbing take-up device according to the present invention prevents a rotation of a latch gear that follows a take-up shaft and rotation of the take-up shaft in a webbing take-up direction when meshed with the latch gear. A pole lever, a solenoid that operates when an occupant pulls out and wears a webbing to move the pole lever in the direction of meshing with the latch gear, and the pole lever against the driving force when the solenoid operates. Of the action lever for restricting the movement of the action lever in the meshing direction and the action of the pole lever of the action lever when the action of the action lever is restricted, the action of the action lever is frictionally engaged with the take-up shaft to pull out and take up a predetermined amount of the webbing. The guide roller that releases the movement restriction of the pole lever by the action lever by rotation and the action lever When the bar restricts the movement of the pole lever in the direction of meshing with the latch gear, the bar engages with the pole lever to limit the movement of the pole lever in the direction of meshing with the latch gear, and to prevent the winding shaft from moving slightly. And a cam that follows the rotation of the webbing withdrawal direction and guides the pawl lever in the direction of meshing with the latch gear.

[Operation] In the present invention having the above-described configuration, when an occupant is seated on the seat and pulls out the webbing to engage the tongue plate with the buckle device, the solenoid moves the pole lever in the direction of meshing with the latch gear in conjunction with this. (This interlocking may be interlocking with other operations such as a door closing operation after the tongue plate and the buckle device are engaged).

The movement of the pole lever is first restricted by the action lever, and the winding force of the webbing still acts on the winding shaft. As a result, the slack (slack) of the webbing worn by the occupant is wound up, and the webbing closely contacts the occupant's body.

Next, when the occupant pulls out a predetermined amount of the webbing from this state, the slack of the pulled-out webbing is rewound around the winding shaft. The guide roller is rotated by the webbing pull-out and the winding rotation of the winding shaft, and the movement restriction of the pole lever by the action lever is released. The amount of webbing pulled out at this time is preferably such that the webbing withdrawal operation can be visually confirmed.

The pole lever, which has been released from the action lever restriction, can move in the direction of engagement with the latch gear.
The cam then engages the pole lever to limit movement in the direction of engagement with the latch gear. The cam slightly pulls out the webbing and rotates the take-up shaft in the webbing pull-out direction to release the movement limitation of the pole lever and guide the pole lever in the meshing direction with the latch gear.

In this way, the pole lever meshes with the latch gear and prevents the winding shaft from rotating in the webbing winding direction.
The amount of pulling out the webbing to release the movement limitation of the pole lever by the cam is such that the webbing worn by the occupant does not cause unnecessary slack and the webbing does not give the occupant a feeling of pressure (about 20 mm). I wish I had it.

As described above, according to the present invention, when the webbing worn by the occupant is prevented from rotating in the take-up direction, it is necessary to take-up and take-out the webbing 2 reciprocations after the pole lever starts to move in the direction to engage with the latch gear. Therefore, it is possible to eliminate the inconvenience of blocking the rotation of the take-up shaft in the webbing take-up direction in a state where the slack cannot be removed due to a temporary catch during the take-up and the withdrawal of the webbing. it can.

In the winding device of the present invention, the webbing can be pulled out even after the rotation of the winding shaft in the winding direction of the webbing is blocked, and the rotation of the winding shaft in the winding direction of the winding shaft is released once. A so-called memory mechanism that can prevent rotation in the winding direction again when the same amount is wound may be provided.

[Embodiment] FIG. 1 shows a webbing retractor 10 according to this embodiment.

Both ends of the frame 12 are bent, and leg plates 12A and 12B that are parallel to each other are formed. Leg plate 12
A and 12B are respectively provided with coaxial circular holes 14,
The winding shaft 16 is axially supported near both ends. The webbing 18 shown in FIG. 3 is wound in layers in the middle of the winding shaft 16.

It should be noted that the winding device 10 is provided with a locking means for detecting an acceleration of the winding device 16 by an acceleration sensor and for instantaneously preventing the winding shaft 16 from rotating in the webbing pull-out direction (the direction opposite to the arrow A in FIG. 1). (Not shown).

An adapter 20 is coaxially fixed to the leg plate side 12A side of the winding shaft 16, and an inner end portion of a mainspring spring 24 is locked in a slit hole 22 provided on the outer periphery of the adapter 20. The outer end portion of the mainspring spring 24 is locked to a spring cover 26 that accommodates the mainspring spring 24. As a result, the winding shaft 16 is urged to rotate in the direction of arrow A in FIG. 1 by the urging force of the mainspring spring 24. The spring cover 26 is the leg plate 12A.
The mainspring spring 24 is fixed to a seat plate 28 attached to the main spring spring 24 and sealed.

A small-diameter shaft portion 30 is formed so as to project from the adapter 20, and is fitted into a circular hole 44B provided in the sub adapter 44. The outer periphery of the sub-adapter 44 is fitted into a circular hole 34 provided in the center of the cam support 32. As a result, the cam support 32 rotates integrally with the adapter 20. This cam support 32 and spring cover 26
Since they are arranged with a slight distance from them, they do not hinder the rotation due to friction or the like during their relative rotation. If the cam support 32 and the spring cover 32 are formed of a member having a small friction coefficient (for example, phenol resin), there is no problem even if they are assembled in contact with each other.

A substantially V-shaped groove 32A is provided on the outer periphery of the cam support 32, and a substantially ring-shaped cam 36 is fitted therein. That is, a notch portion 36A is provided in a part of the cam 36 so that the diameter dimension can be expanded / contracted, and the groove 32A of the cam support 32 is elastically deformed in the direction of increasing the diameter dimension of the cam 36 at the time of fitting. It is adapted to be frictionally engaged with.

A stopper portion 26A is formed so as to project from the spring cover 26, and is arranged between a narrow projection portion 38 and a wide projection portion 40 that are formed to radially project from the outer circumference of the cam 36. As a result, the rotation of the cam 36 is limited to a predetermined angle (angle between the narrow protrusion 38 and the wide protrusion 40), and even if the cam support 32 rotates further, the cam support 3 is rotated.
2 and the cam 36 are designed to rotate relative to each other.

The sub-adapter 44, into which the small-diameter shaft portion 30 is inserted, penetrates a circular hole 48 provided at the center of the latch gear 46.
The inner end portion of the small mainspring spring 50 is locked to the outer circumference of the sub-adapter 44, and is accommodated in the accommodating portion 47 (see FIG. 2) formed on the back side of the latch gear 46 in FIG. The small mainspring 50 has a latch gear 46 at its outer end.
Is locked to the rib 47A forming the housing portion 47 of
As a result, the latch gear 46 rotates following the rotation of the cam support 32.

As shown in FIG. 6, the winding shaft 1 of the latch gear 46 is
First inner teeth 46 </ b> A are formed on the inner peripheral surface on the surface side facing the direction opposite to 6. Also, this first internal tooth 46
Corresponding to A, the sub-adapter 44 has a pinion gear portion 44
A is formed, and these mesh with each other via the planetary gear 52.

Here, when the pinion gear portion 44A and the latch gear 46 rotate relative to each other, the planet gear 52 revolves around the rotation center of the winding shaft 16 while rotating on its own axis.
When the latch gear 46 rotates following the sub-adapter 44 by the urging force of the mainspring 50, the relative positions of the first internal teeth 46A, the planet gears 52, and the pinion gear portion 44A may not change. Without winding shaft 16
It is designed to rotate together with.

The axial dimension of the tooth portion of the planetary gear 52 is formed to be longer than the axial dimension of the first inner tooth 46A, and the tooth portion protruding from the latch gear 46 is provided with the second dimension formed on the inner peripheral surface of the memory plate 54. The inner teeth 54A mesh with each other. The memory plate 54 includes the pin 5 protruding from the pinion gear portion 44A.
6 is supported by the insertion shaft, and the stop ring 58 prevents the movement of the axial line. A rubber cover 60 is attached to the outer circumference of the tip of the pin 56 to form a shaft roller 62. The tip of the pin 56 is pivotally supported by a circular hole 63A provided in the cover 63.

The second inner teeth 54A have the same pitch circle size as the first inner teeth 46A, and the number of teeth is reduced by three teeth, and the pitch size (L size and M size in FIG. 5) is formed between both teeth. There is a gap between. As a result, as shown in FIG. 5, when the first inner teeth 46A are fixed, the planetary gear 52 is not moved to the second gear.
So that the internal tooth 54A of the arrow overlaps the first internal tooth 46A.
It is designed to push in the direction. Also, the first and second
In a state in which both the internal teeth 46A and 54A of the first internal teeth 4A are fixed, even if the pinion gear portion 44A rotates to transmit this rotational force to the planetary gear 52, the first and second internal teeth 4
The shift of 6A and 54A prevents the planetary gear 52 from being driven.

A lever portion 54C protruding in the radial direction is formed from the peripheral surface of the memory plate 54, and is in contact with a side surface of a protrusion portion 46B provided on the latch gear 46. When the latch gear 46 is rotated following the sub adapter 44 by the biasing force of the small mainspring 50, the lever portion 54C of the memory plate 54 is always held in contact with the protrusion 46B of the latch gear 46.

When the rotation of the latch gear 46 is stopped and the winding shaft 16 rotates in the webbing pull-out direction, the planet gear 52
The lever portion 54C is gradually separated from the protrusion portion 46B by the pushing action of the second inner teeth 54A by the action (see FIG. 4 (F)).

The rotation of the latch gear 46 is prevented by engaging the one end portion 64A of the pole lever 64 with the tooth portion 46C of the latch gear 46. The pole lever 64 is formed in a substantially L shape, and its bent portion is pivotally supported by a pin 28A protruding from the seat plate 28. Also, the pole lever 64
A pin 66 is projected from and corresponds to the outer peripheral portion of the cam 36. Here, the notch portion 36A formed in the cam 36 is also used as a housing portion for the pin 66. When the pin 66 is housed in the notch portion 36A, the one end portion 64A of the pole lever 64 and the latch gear 46 are engaged. It is supposed to be combined.

A pin 68 projects from the surface of the pole lever 64 opposite to the surface on which the pin 66 projects, and one end of an action lever 70 is pivotally supported. A retaining ring 72 is locked at the tip of the pin 68, and the action lever 70
It is said to be used to prevent slipping out. A torsion coil spring 76 is attached between the action lever 70 and the pawl lever 64, and urges the action lever 70 in a direction to abut the stopper pin 64B attached to the pawl lever 64.

The action lever 70 is extended substantially linearly in the direction of the center of rotation of the sub-adapter 44, and can contact the shaft roller 62 via a guide roller 74.

The guide roller 74 is composed of a roller body 80 pivotally supported on the other end of the action lever 70 via a pin 78, and a rubber cover 82 attached to the roller body 80. At the time of contact, the rotation of the shaft roller 62 is transmitted by friction. A torsion coil spring 84 is interposed between the roller body 80 and the action lever 70 to urge the guide roller 74 clockwise as shown in FIG. 80A is in contact with the right end portion 70A of the action lever 70 in FIG. Also,
When the guide roller 74 rotates clockwise against the urging force of the torsion coil spring 84 in FIG.
Rotates until it contacts the left end 70B of the action lever 70.

A rectangular hole 86 is provided in the other end 64C of the pole lever 64, and a pin 92 attached to the tip of the plunger 90 of the solenoid 88 is loosely fitted therein. The operation of the solenoid 88 is interlocked with the buckle device 94. As shown in FIG. 3, an occupant 96 is seated on the seat 98, and the tongue plate 100 attached to the middle portion of the webbing 18 is engaged with the buckle device 94. As a result, the limit switch 102 incorporated in the buckle device 94 is turned on, and power can be supplied to the solenoid 88.

Here, when the solenoid 88 is powered off, the plunger 90 is moved in the direction of arrow D in FIG. 1 (the direction in which the plunger 90 extends) by the urging force of the compression coil spring 104, and the pole lever 64 is shown in FIGS. 1 and 4. It is rotated in the direction of arrow C (completely separated state shown in FIG. 4 (A)).

When power is supplied to the solenoid 88, the plunger 90 is moved in the direction opposite to the arrow D in FIGS.
Is rotated around the pin 28A. As a result, the guide roller 74 and the shaft roller 62 are brought into contact with each other, and the guide roller 74 is rotated according to the winding operation of the webbing 18 due to the frictional engagement between the cover 60 and the cover 82. This rotation is limited to about one rotation by the rotation limiting pin 80A. In this state, the pin 66 does not come into contact with the cam 36 (the separated holding state shown in FIG. 4 (B)).

By pulling out and winding the webbing 18 by a predetermined amount (200 mm or more in this embodiment) from this state, the action lever 70 is rotated counterclockwise about the pin 68 against the biasing force of the tension coil spring 76. The movement restriction of the pole lever 64 by the action lever 70 is released, and the pin 66 is brought into contact with the cam 36 by being rotated by the solenoid 88 (separation shown in FIGS. 4C and 4D). Holding state).

From this state, the pin 66 and the cutout portion 36A of the cam 36 are made to correspond to each other by a slight rotation of the cam 36 in the webbing pull-out direction, and the pin 66 is housed in the cutout portion 36A (fourth position). Engagement state shown in FIG.

The operation of this embodiment will be described below.

When the occupant 96 wears the webbing 18, the webbing 18 is pulled out from the take-up shaft 16 to remove the tongue plate 10.
By engaging 0 with the buckle device 94, the webbing can be attached.

When the vehicle falls into an emergency, the acceleration sensor detects this and activates the locking means. By the operation of the locking means, the rotation of the winding shaft 16 in the webbing pull-out direction (the direction opposite to the arrow A in FIG. 1) is instantaneously stopped, and the occupant 96 can be restrained.

The buckle device 94 has a built-in limit switch 102. When the tongue plate 100 is engaged with the buckle device 94, the tongue plate 100 is turned on and the solenoid 88 is turned on.
Is turned on. This prevents the plunger 90 from moving in the direction opposite to the arrow D in FIG. 1 to prevent the webbing winding force of the winding shaft 16 from being applied to the occupant 96 in the webbing mounted state.

Hereinafter, this operation will be described in detail with reference to FIG.

As shown in FIG. 4 (A), when the occupant 96 is seated on the seat 98 and the webbing 18 is pulled out, the cam 36 rotates counterclockwise (with a narrow width) via the cam support 32 in accordance with the rotation of the winding shaft 16. The protrusion 38 rotates in the direction in which it contacts the stopper 26A. Here, even if the narrow protruding portion 38 comes into contact with the stopper portion 26A and the winding shaft further rotates, the cam 3
6 is held in this state by the relative rotation with the cam support 32.

Next, as shown in FIG. 4 (B), when the occupant 96 engages the tongue plate 100 with the buckle device 94, the limit switch 102 is turned on, and the plunger 90 of the solenoid 88 receives the urging force of the compression coil spring 104. Move in the direction opposite to the arrow D against. As a result, the pole lever 64 rotates in the direction of arrow C around the pin 28A, and the one end portion 64A of the pole lever 64 moves in the direction in which it engages with the latch gear 46, but the guide roller 74 attached to the tip end portion of the action lever 70. Comes into contact with the shaft roller 62 to prevent the pole lever 64 from moving. Where crew 9
When 6 wears webbing 18, normal webbing 1
Since 8 is pulled out a little longer, it is wound around the winding shaft 16 by the urging force of the mainspring spring 18. The guide roller 74 receives a rotational force from the shaft roller 62 that rotates in response to the rotation of the winding shaft 16 and rotates counterclockwise in FIG. 4, and the rotation limiting pin 80A is separated from the right end 70A.

At the same time, the cam 36 is rotated in the clockwise direction via the cam support 32, and the stopper portion 26A comes into contact with the wide protrusion 40. Since the webbing take-up amount due to the rotation of the take-up shaft 16 in the webbing take-up direction is usually a small amount, the webbing 18 comes into close contact with the occupant 96 before the rotation limiting pin 80A reaches the left end 70B. At this point, the webbing winding rotation of the winding shaft 16 is stopped. Further, in this state, the winding shaft 16 is biased by the mainspring spring 24.

As shown in FIG. 4 (C), the occupant 96 and the webbing 1
Pull out the webbing 18 again (200 mm or more) from the state where 8 and 8 are in close contact. In response to this pullout, the guide roller 74 receives the rotational force of the shaft roller 62 and rotates in the clockwise direction, whereby the rotation limiting pin 80A of the guide roller 74 is rotated.
Contacts the right end 70A. After that, the webbing 18 is further pulled out, the guide roller 74 and the shaft roller 62 slip, and only the shaft roller 62 rotates, and the cam 36 rotates until the narrow protrusion 38 contacts the stopper portion 26A.

Next, as shown in FIG. 4D, when the pulled-out webbing 18 is wound up by the urging force of the mainspring spring 24, the guide roller 74 is rotated counterclockwise by the rotation of the shaft roller 62. When the guide roller 74 makes almost one rotation, the pin comes into contact with the left end portion 70B of the action lever 70,
The rotation of the guide roller 74 is blocked. However, since the webbing 18 is pulled out by 200 mm or more as described above, even if the guide roller 74 makes almost one rotation, the biasing force of the mainspring 24 is still applied, and this biasing force causes the guide roller 74 to rotate. The action of revolving around the roller 62 occurs. In response to this action, the action lever 70 rotates counterclockwise about the pin 68 against the biasing force of the torsion coil spring 76. As a result, the movement restriction of the pawl lever 64 by the action lever 70 is released, and the pin 66 of the pawl lever 64 contacts the outer periphery of the cam 36. The cam 36 is rotated clockwise and has a wide protrusion 40.
Since the stopper portion 26A is in contact with the stopper portion 26A, the pin 66 and the notch portion 36A do not correspond to each other, and therefore the one end portion 64A of the pole lever 64 does not mesh with the tooth portion 46C of the latch gear 46.

As shown in FIG. 4 (E), in this state, when the occupant 96 slightly pulls out the webbing 18 at the abdomen or the like, the cam 36 rotates counterclockwise and the pin 66 is housed in the cutout portion 36A. When the pin 66 is housed in the cutout portion 36A, the one end portion 64A of the pole lever 64 is fixed to the latch gear 46.
It is possible to prevent the rotation of the latch gear 46 by engaging with the tooth portion 46C of the.

When the rotation of the latch gear 46 is blocked, the memory plate 5
Since the lever portion 54C of No. 4 is in contact with the protrusion portion 46B and the rotations of both the first and second inner teeth 46A and 54A are stopped, the deviation of both teeth (in the solid line and imaginary line in FIG. 5). The planet gears 52 cannot be driven due to the deviation of the teeth shown in the drawing, and even if the winding shaft 16 tries to rotate in the webbing winding direction by the urging force of the mainspring spring 24, the rotation is blocked. As a result, rotation of the winding shaft 16 in the winding direction can be prevented, and a feeling of pressure on the occupant 96 can be eliminated.

Further, in the winding device 10, the amount of the webbing pulled out after the engagement of the latch gear 46 and the pawl lever 64 can be stored by the movement of the memory plate 54.

That is, in the normal webbing mounted state, the lever portion 54 </ b> C of the memory plate 54 has the protrusion 46 of the latch gear 46.
It is in contact with the side surface of B (see FIG. 4 (E)).

Here, when the occupant 96 moves his / her upper body to operate a switch or the like on the instrument panel, the webbing 1
8 is withdrawn. As a result, the pinion gear portion 44A rotates as the winding shaft 16 rotates. Along with this, since the first internal teeth 46B are stopped, the planet gears 52 revolve around the winding shaft 16 in the counterclockwise direction while rotating in the clockwise direction. As shown in FIG. 5, the direction in which the second inner teeth 54A eliminate the deviation from the first inner teeth 46A when the planetary gear 52 and the first inner teeth 46A mesh with each other (direction of arrow E in FIG. 5). ) To. By repeating this in sequence, the memory plate 54 becomes the pinion gear portion 44.
It is significantly decelerated with respect to the rotation of A and rotates clockwise (see FIG. 4 (F)).

Accordingly, the webbing 18 can be pulled out even when the pawl lever 64 and the latch gear 46 are in the engaged state. In this case, the urging force of the mainspring spring 24 is applied to the winding shaft 16.

When the occupant 96 finishes operating the switches and the like and returns to the original position, the webbing 18 is wound around the winding shaft 16 by the urging force of the mainspring spring 24. At the same time, the memory plate 5
4 rotates counterclockwise, the lever portion 54C abuts the protrusion 46B at the same position as before the movement of the upper body of the occupant 96, and the rotation of the second internal tooth 54A is blocked.
The urging force in the webbing winding direction by 4 can be prevented.

In this way, the occupant 96 does not receive the winding force of the webbing 18 on the winding shaft 16 when the webbing is attached, and the feeling of pressure can be eliminated. Further, when the upper body moves during operation, the webbing 18 can be pulled out freely, and at the end of the movement, the take-up force can be blocked again with the original amount of pulling out the webbing.

The occupant 96 finishes driving the vehicle, and the tongue plate 100
When the webbing 18 is released from the buckle device 94 and the mounting of the webbing 18 is released, the solenoid 88 is turned off and the plunger 90 moves in the direction of arrow D in FIG. Rotate in the direction of arrow C.

As a result, the pole lever 64 is separated from the latch gear 46, and the winding force of the webbing 18 onto the winding shaft 16 can be restarted (see FIG. 4 (A)).

Note that the memory mechanism section applied to this embodiment is merely an example, and the rotation of the male screw coaxially attached to the winding shaft moves the moving member having the female screw screwed to the male screw in the axial direction. It may be another memory mechanism that stores the webbing pullout amount.

[Effects of the Invention] As described above, in the webbing retractor according to the present invention, the webbing worn by the occupant performs a predetermined amount of withdrawing and winding operations, and then withdraws the webbing slightly to pull out the webbing of the take-up shaft. Since the unidirectional rotation is prevented, unnecessary slack (about 20 mm or more) does not occur in the webbing worn by the occupant, and the occupant does not feel squeezed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a webbing retractor according to this embodiment, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a front view of an occupant wearing a webbing as seen from the front of the vehicle. 4 (A) to 4 (F) are explanatory views showing the engagement state of the pole ever and the latch gear, and FIG. 5 explains the operation of the planetary gear meshing with the first internal teeth and the second internal teeth. An enlarged view and FIG. 6 are front views showing the memory mechanism section. 10 ... Winding device, 16 ... Winding shaft, 18 ... Webbing, 46 ... Latch gear, 64 ... Pole lever, 70 ... Action lever, 74 ... Guide roller.

Claims (1)

[Scope of utility model registration request] 1. A webbing take-up device capable of preventing biasing rotation of a take-up shaft in a webbing take-up direction when an occupant wears the webbing, the latch gear rotating following the take-up shaft, A pawl lever that prevents rotation of the take-up shaft in the webbing take-up direction when meshed with a latch gear, and a solenoid that operates by an occupant pulling out and mounting the webbing to move the pawl lever in a direction that meshes with the latch gear. An action lever that limits movement of the pole lever in the meshing direction with respect to the latch gear against the driving force when the solenoid operates, and the winding shaft when movement of the pole lever of the action lever is limited. Frictionally engages with the action lever by pulling out a predetermined amount of the webbing of the winding shaft and rotating the winding. When the movement restriction in the meshing direction of the guide lever and the latch gear by the action lever is released by the guide roller for releasing the movement restriction of the pole lever by A webbing take-up device comprising: a cam that restricts movement in the meshing direction and follows a slight rotation of the winding shaft in the webbing drawing-out direction to guide the pawl lever in a direction to mesh with the latch gear.