JP2005247060A - Webbing take-up device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tension reducer function to reduce or eliminate excessive oppressive feeling when attaching a webbing by a motor with a simple structure at low cost. <P>SOLUTION: One end of a power spring 22 in a webbing take-up device 10 is locked to a spring holding box 24, the spring holding box 24 is rotated in the forward/reverse direction to change the set position (the locking position of the other end) of the power spring 22, and the take-up urging force by the power spring 22 is controlled (changed). Thus, excessive oppressive feeling of the webbing can be reduced or eliminated. The configuration of a single printed circuit board 40 to constitute a drive circuit of a motor 36 is simple, and the rotational position of the spring holding box 24 can be arbitrarily set by the shape of each contact pattern and the pattern length. Thus, the webbing winding force or the like can be arbitrarily set, and the range of applications is also expanded. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a webbing take-up device, and in particular, a spring for applying a take-up biasing force to a take-up shaft is locked to a spring holding box, and the spring holding box is rotated by a motor so that the take-up by the spring is performed. The present invention relates to a webbing take-up device provided with a so-called tension reducer capable of adjusting the force.

  The occupant restraint seat belt device includes a webbing take-up device. In this webbing take-up device, a so-called tension reducer mechanism for reducing or eliminating excessive pressure feeling when the webbing is mounted, and a “slack” by winding a webbing belt on a spool by a certain amount in a vehicle sudden deceleration state, etc. And a pretensioner mechanism that more securely holds the occupant's body by increasing the restraining force of the occupant's body by the webbing belt. A so-called motor retractor having a configuration in which a function is performed by a motor is known (see Patent Document 1 as an example).

  In this type of motor retractor, for example, not only can the function of a tension reducer and pretensioner be exhibited as described above, but also it is possible to assist in winding and pulling out the webbing when wearing a normal webbing, Very beneficial.

  However, in the conventional motor retractor as described above, too much to effectively use all the various functions of the motor itself (because all the functions of the webbing take-up device were to be pursued by a single motor), On the other hand, there was a problem that the structure was complicated and the cost was high.

In particular, in the tension reducer mechanism, when trying to realize control that closely follows the occupant's physique and movement, the torque value applied to the take-up shaft and the winding amount of the webbing are also detected and the motor is operated based on them. Control must be performed, and the configuration and structure of the control circuit are complicated and the cost is significantly increased.
JP 2001-130376 A

  In consideration of the above-mentioned facts, the present invention is simple and simple to perform a tension reducer function for reducing or eliminating excessive feeling of pressure when wearing a webbing, and a winding and drawing attachment assisting function when wearing a webbing by a motor. It is an object to obtain a webbing take-up device that can be realized at a low cost with a simple structure.

  A webbing take-up device according to a first aspect of the present invention relates to a spring that is connected at one end to a take-up shaft from which the webbing is taken out and applied, and to which the other end of the spring is applied. A spring holding box that is rotated and rotated in the forward and reverse directions to change the set position of the spring, thereby adjusting the winding biasing force by the spring; a motor; the motor; A driving force transmission means for connecting the spring holding box to transmit the rotational force of the motor to the spring holding box for rotation, and a drive circuit for the motor, for driving the motor in the forward and reverse directions A webbing take-up device comprising a single printed circuit board, wherein the single printed circuit board is a rotation direction detection unit that detects a winding rotation or a drawing rotation of the winding shaft. A holding box rotational position detection unit contact pattern is set according to the predetermined rotational position detects the rotational position of said spring retainer box, but is characterized by, provided integrally.

  In the webbing take-up device according to claim 1, a take-up biasing force is applied to the take-up shaft by a spring. In addition, the other end of the spring is locked to a spring holding box, and this spring holding box rotates in the forward and reverse directions to change the spring set position, thereby adjusting (changing) the winding urging force by the spring. can do. Further, when the motor is driven, the rotational force of the motor is transmitted to the spring holding box via the driving force transmitting means, the spring holding box is rotated, and the spring setting position is changed.

  Accordingly, the winding biasing force by the spring can be adjusted (changed) by appropriately driving the motor and rotating the spring holding box to change the spring setting position. In other words, if the motor is driven at the time of wearing or releasing the webbing, a so-called tension reducer function for reducing or eliminating excessive feeling of webbing, and a function for assisting in winding or pulling out the webbing can be exhibited. .

  For example, when the webbing is not pulled out, the spring holding box is moved (rotated) so that the winding biasing force by the spring is maximized, and the winding by the spring is performed after the webbing is pulled out until the buckle is locked. Move the spring holding box so that the urging force is in an intermediate force state, and after the buckle is locked, move the spring holding box so that the winding urging force by the spring is minimized. When released after being released, the spring holding box can be moved so that the winding biasing force by the spring is maximized. As a result, it is possible to realize a tension reducer function for reducing or eliminating excessive feeling of pressure at the time of webbing wearing, and an auxiliary function for winding and drawing at the time of webbing wearing.

  The webbing take-up device according to claim 1 further includes a single printed circuit board that constitutes a motor drive circuit and drives the motor in forward and reverse directions, and the single printed circuit board. The rotation direction detection unit detects the winding rotation or the drawing rotation (forward and reverse rotation direction) of the winding shaft, detects the rotation position of the spring holding box, and sets the contact pattern according to the predetermined rotation position. The holding box rotation position detection unit is integrally provided.

  Therefore, the configuration of the printed circuit board for realizing the tension reducer function and the webbing attachment assist function as described above is simple and simple, and further, depending on the contact pattern (for example, the pattern length) of the holding box rotation position detection unit. The webbing tension in the tension reducer function, the webbing take-up force in the webbing attachment assist function, and the like can be arbitrarily set, and the range of application is expanded.

  The webbing take-up device according to a second aspect of the present invention is the webbing take-up device according to the first aspect, wherein the holding box rotation position detecting portion of the single printed circuit board locks the buckle after the webbing is pulled out. The contact pattern is set so that the rotational position of the spring holding box is different between before and after the buckle is locked.

  3. The webbing take-up device according to claim 2, wherein the contact pattern of the holding box rotation position detecting portion is a spring between when the webbing is pulled out and when the buckle is locked, and after the buckle is locked. The rotation position of the holding box is set to be different. For this reason, the webbing take-up force between the time when the webbing is pulled out and the buckle is locked, that is, when the occupant is wearing the webbing, and the webbing tension after the buckle is locked, that is, when the webbing is installed, are set differently. It can be.

  Therefore, the occupant's webbing operability and comfort when worn can be further improved.

  The webbing take-up device according to a third aspect of the present invention is the webbing take-up device according to the first or second aspect, wherein the holding box rotation position detection unit of the single printed circuit board is the winding by the spring. The first position of the spring holding box where the urging force is maximum, the second position of the spring holding box where the winding urging force by the spring is minimum, and the winding urging force by the spring are in an intermediate force state The contact pattern is set in accordance with each of the third positions, and the spring holding box is in the first position when the webbing is not pulled out until the buckle is locked after the webbing is pulled out. When the buckle is locked, it becomes the second position. The first position is characterized by.

  In the webbing take-up device according to the third aspect, when the webbing is not pulled out, the spring holding box is moved to the first position, and the winding biasing force by the spring is maximized. When the webbing is pulled out, until the buckle is locked, the spring holding box is moved to the third position and the winding urging force by the spring becomes an intermediate force state, so that the occupant's webbing mounting operability (drawing property) Will improve. In addition, after the buckle is locked, the spring holding box is moved to the second position, and the winding urging force by the spring is minimized, and excessive pressure feeling when wearing the webbing is reduced or eliminated, and comfort (wearing) Improved). Further, when the buckle is released and then released again, the spring holding box is moved to the first position, the winding urging force by the spring is maximized, and the entire webbing is quickly wound up.

  In this way, the occupant's webbing operability and comfort when worn can be further improved.

  As described above, the webbing take-up device according to the present invention uses a motor to provide a tension reducer function for reducing or eliminating excessive feeling of pressure when wearing a webbing, and an auxiliary function for taking up and drawing out when wearing a webbing. In doing so, it has an excellent effect that it can be realized at a low cost with a simple and simple structure.

  FIG. 1 is an exploded perspective view showing a configuration of a webbing take-up device 10 according to an embodiment of the present invention. FIG. 2 is a sectional view showing the configuration of the webbing take-up device 10. Further, FIG. 3 shows the configuration of the webbing take-up device 10 in a cross-sectional view along the line 3-3 in FIG. 2, and FIG. 4 shows the configuration of the webbing take-up device 10 in FIG. A cross-sectional view along line 4 is shown.

  The webbing take-up device 10 includes a take-up shaft 12. The winding shaft 12 is rotatably supported by the frame 14, and one end of a webbing (not shown) is locked, and the webbing is wound or pulled out by the rotation of the winding shaft 12.

  An adapter 16 is connected to one end of the winding shaft 12 outside the frame 14, and a cover 18 and a box-shaped base 20 are attached to the side of the frame 14. The adapter 16 penetrates through the base 20, and its tip projects outward from the base 20, and always rotates integrally with the winding shaft 12.

  A spring 20 and a spring holding box 24 are disposed in the base 20. The main spring 22 has an inner end locked to the adapter 16 and an outer end locked to the spring holding box 24, and urges the winding shaft 12 in the webbing winding direction. On the other hand, the spring holding box 24 that locks the outer end portion of the mainspring spring 22 can be rotated coaxially and forward and backward with the adapter 16 in a state in which the mainspring spring 22 is accommodated therein (relative to the adapter 16). ) It is supported by the base 20. For this reason, when the spring holding box 24 rotates in the forward and reverse directions, the locking position of the outer end portion of the mainspring spring 22, that is, the setting position of the mainspring spring 22 can be changed. The winding biasing force applied to the shaft 12 can be adjusted (changed).

  On the outer peripheral edge of the spring holding box 24, a worm tooth portion 26 is formed to constitute a so-called worm wheel. An intermittent tooth portion 28 is integrally formed on the other side of the spring holding box 24 (on the side opposite to the mainspring spring 22). Similar to the adapter 16 described above, the intermittent tooth portion 28 is disposed so as to protrude outward from the base 20.

  A worm gear 30 constituting a driving force transmitting means is engaged with the worm tooth portion 26 of the spring holding box 24. The worm gear 30 is supported at one end of a shaft 32, and a spur gear 34 constituting a driving force transmitting means is attached to the other end of the shaft 32. The spur gear 34 meshes with a spur gear 38 that is attached to the rotating shaft of the motor 36 and similarly constitutes a driving force transmitting means. The motor 36 is fixed by a stay 37, and the spur gear 34, the spur gear 38 and the like are covered with a cover 39. Thus, when the motor 36 is driven, the driving force is transmitted through the spur gear 38, the spur gear 34, the worm gear 30, and the worm tooth portion 26, and the spring holding box 24 is rotated. Accordingly, by appropriately driving the motor 36, the spring holding box 24 is rotated forward or backward to change the setting position of the mainspring 22 and the winding biasing force applied to the winding shaft 12 by the mainspring 22 is changed. It is the structure which can adjust (change).

  On the other hand, a printed circuit board 40, which will be described later, is provided on the other side of the base 20 (opposite to the spring holding box 24), and a holder 42 is rotatably supported by the shaft portion 44 of the base 20. A gear portion 46 corresponding to the intermittent tooth portion 28 of the spring holding box 24 is formed on the outer peripheral edge of the holder 42. For this reason, when the spring holding box 24 rotates, the intermittent tooth portion 28 intermittently engages with the gear portion 46, and the holder 42 rotates intermittently. Further, as shown in FIGS. 7, 8 </ b> A, and 8 </ b> B, a contact 48 is attached to the back side of the holder 42 (the printed board 40 side). Touching.

  Further, above the holder 42, an arm 52 is supported by a support shaft 50 so as to be swingable within a predetermined range. A protrusion 54 is formed to protrude from the tip of the arm. Further, as shown in FIGS. 5 and 6, a contact 56 is attached to the back side of the arm 52 (printed board 40 side), and is in contact with the contact pattern of the printed board 40.

  Further, a rotor 58 is disposed near the arm 52. The rotor 58 is integrally locked to the tip of the adapter 16 described above, and always rotates integrally with the adapter 16 (that is, the winding shaft 12). A friction spring 60 is fitted on the outer periphery of the rotor 58. The friction spring 60 is formed in a substantially C shape, and the open side end portion is a pair of engaging portions 62 and 64. These engaging portions 62 and 64 correspond to the protrusions 54 of the arm 52, and can be engaged with the protrusions 54 as the rotor 58 rotates. When the engaging portions 62 and 64 are engaged with the protrusion 54 of the arm 52, the arm 52 swings around the support shaft 50, and when the arm 52 reaches the limit of the swing range (the swing is limited). The friction spring 60 is moved relative to the rotor 58 and only the rotor 58 is idled (even if the rotor 58 rotates, the friction spring 60 has the engaging portions 62 and 64 on the projection 54 of the arm 52). It is configured to be held in an engaged state).

  On the other hand, FIG. 9 shows a plan view of the configuration of the printed circuit board 40. FIG. 10 is a schematic block diagram showing the configuration of the drive circuit of the motor 36.

  As described above, the motor 36 for rotating the spring holding box 24 to change the setting position of the spring spring 22 is connected to the holding box rotation position detecting unit 66 provided on the single printed circuit board 40, and The holding box rotation position detection unit 66 is similarly connected to a rotation direction detection unit 68 provided on the single printed circuit board 40. Further, the rotation direction detection unit 68 is connected to a power source 72 via a buckle switch 70 provided on the buckle of the vehicle.

  The printed circuit board 40 constitutes a drive circuit for the motor 36 and is a single circuit board for driving the motor 36 in the forward and reverse directions.

  As shown in FIG. 9, the printed circuit board 40 has a pattern of a rotation direction detection unit 68 corresponding to the contact 56 of the arm 52 and a holding box rotation position detection unit 66 corresponding to the contact 48 of the holder 42. The contact 56 of the arm 52 is in contact with the rotation direction detection unit 68, so that the winding rotation or the drawing rotation of the winding shaft 12 can be detected, while the contact of the holder 42 When 48 is in contact with the holding box rotation position detector 66, the rotational movement position of the spring holding box 24 by the drive of the motor 36 is determined (detected).

  That is, the COM pattern portion 74, the RET pattern portion 76, and the EXT pattern portion 78 are provided as the rotation direction detection portion 68 that detects the winding rotation or the drawing rotation of the winding shaft 12 (adapter 16, rotor 58). . A contact 56 attached to the arm 52 is in sliding contact with each of these pattern portions, and the COM pattern portion 74 and the RET pattern portion 76 are electrically connected via the contact 56 by the swing of the arm 52. The winding rotation of the winding shaft 12 is detected, while the COM pattern portion 74 and the EXT pattern portion 78 are electrically connected via the contact 56 to detect the drawing rotation of the winding shaft 12. Yes. Thereby, the drive current polarity of the motor 36 is switched, and the motor 36 can be driven by forward rotation or reverse rotation.

  On the other hand, as a holding box rotation position detection unit 66 that determines (detects) the rotational movement position of the spring holding box 24 by driving the motor 36, a COM pattern unit 80, a MAX pattern unit 82, a MIN pattern unit 84, and a MED pattern unit 86 are provided. Is provided. A contact 48 attached to the back side of the holder 42 is in sliding contact with each of these pattern portions, and the contact position of each contact 48 is changed by the rotation of the holder 42, whereby the rotation of the spring holding box 24 is performed. The moving position can be determined (detected) (the drive circuit of the motor 36 is closed).

  That is, when the COM pattern portion 80 and the MAX pattern portion 82 are conducted through the contact 48, the drive circuit of the motor 36 is closed (ON) to drive the motor 36, and the contact 48 is further connected to the COM pattern portion 80. When the circuit is disconnected from the MAX pattern portion 82, the circuit is cut (turned OFF), and the spring holding box 24 is rotated to the “first position” where the winding biasing force by the mainspring spring 22 is maximized. Further, the COM pattern portion 80 and the MIN pattern portion 84 are electrically connected via the contact 48, whereby the drive circuit of the motor 36 is closed (ON) to drive the motor 36, and the contact 48 is further connected to the COM pattern portion 80. When the circuit is disconnected from the MIN pattern portion 84, the circuit is cut off (turned OFF), and the spring holding box 24 is rotated to the “second position” where the winding biasing force by the mainspring spring 22 is minimized. Further, the COM pattern portion 80 and the MED pattern portion 86 are electrically connected via the contact 48, whereby the drive circuit of the motor 36 is closed (ON) to drive the motor 36, and the contact 48 is further connected to the COM pattern portion 80. When the circuit is disconnected from the MED pattern portion 86, the circuit is cut off (turned OFF), and the spring holding box 24 is rotated to the “third position” where the winding biasing force by the mainspring spring 22 is in an intermediate force state.

  8A and 8B, the circuit is cut off (turned off) when the contact 48 is separated from the MAX pattern portion 82, the MIN pattern portion 84, or the MED pattern portion 86. As described above, a projection 90 is formed on the cover 88 corresponding to the boundary portion, and the contact 48 is slightly moved relative to the holder 42 by engaging the projection 90 at the boundary portion (so-called “so-called”). The contact 48 is preferably separated from each pattern portion by performing a lost motion.

  Thereby, the spring holding box 24 is rotated according to whether the webbing is pulled out (signal of the rotation direction detection unit 68) and whether the buckle is locked (signal of the buckle switch 70). The webbing is in the “first position” when the webbing is not pulled out, and is in the “third position” from when the webbing is pulled out until the buckle is locked (the buckle switch 70 is turned on). When the buckle is locked, the "second position" is set, and when the buckle is locked and then released again (when the buckle switch 70 is turned off), the "first position" is set.

  In this case, in the present embodiment, for example, the spring spring 22 is based on the “first position” (that is, the webbing is not pulled out) of the spring holding box 24 where the winding biasing force by the spring spring 22 is maximized. The “second position” of the spring holding box 24 at which the winding biasing force is minimized is a state in which the spring holding box 24 is rotated, for example, 10 times, and the spring holding box 24 in which the winding biasing force by the mainspring spring 22 is in an intermediate force state. The “third position” is set so that the spring holding box 24 is rotated, for example, five times. That is, in other words, the spring holding box 24 is rotated 5 times after the webbing is pulled out until the buckle is locked, and is further rotated 5 times (a total of 10 rotations) after the buckle is locked. When the buckle is released again after being locked, the arrangement relationship of each part of the printed circuit board 40 is rotated 10 times in the opposite direction so as to return to the original position so as to be in the “first position”, and The pattern shape (length) of the COM pattern portion 80, the MAX pattern portion 82, the MIN pattern portion 84, the MED pattern portion 86, and the like are set.

  Next, the operation of this embodiment will be described.

  In the webbing take-up device 10 configured as described above, a take-up biasing force is applied to the take-up shaft 12 by a spring 22. Further, the other end of the spring 22 is locked to the spring holding box 24, and the spring holding box 24 rotates in the forward and reverse directions to change the setting position of the spring (the other end locking position). The winding urging force by the mainspring 22 can be adjusted (changed). Further, when the motor 36 is driven, the rotational force of the motor 36 is transmitted to the spring holding box 24 via the worm gear 30 and the like, and the spring holding box 24 is rotated in either the forward or reverse direction to set the spring spring 22 in the set position. Is changed.

  Accordingly, by appropriately driving the motor 36 and rotating the spring holding box 24 to change the setting position of the spring spring 22, the winding biasing force by the spring spring 22 can be adjusted (changed). That is, if the motor 36 is driven when the webbing is mounted or released, a so-called tension reducer function for reducing or eliminating excessive feeling of webbing, and a mounting assist function for winding or pulling out the webbing can be exhibited. it can.

  Here, in the present embodiment, when the webbing is not pulled out, the spring holding box 24 is moved to the “first position”, and the winding biasing force by the mainspring spring 22 is maximized.

  When the webbing is pulled out, the arm 52 swings with the rotation of the winding shaft 12 (adapter 16, rotor 58), and the rotation direction (drawing rotation) of the winding shaft 12 is the rotation direction detection unit 68 of the printed circuit board 40. Detected by. At the same time, the holder 42 is intermittently rotated with the rotation of the winding shaft 12, and the motor 36 is driven while the rotational movement position of the spring holding box 24 is detected. That is, until the buckle is locked (the buckle switch 70 is turned on), the spring holding box 24 is rotated five times by the drive of the motor 36 and moved to the “third position”. Thereby, the winding urging force by the mainspring spring 22 becomes an intermediate force state, and the occupant's webbing mounting operability (drawability) is improved.

  Further, in this case, when the webbing is taken up without the buckle being locked after the webbing is pulled out, the arm 52 swings with the rotation of the winding shaft 12 (adapter 16, rotor 58), The rotation direction (winding rotation) of the winding shaft 12 is detected by the rotation direction detection unit 68 of the printed circuit board 40. As a result, the motor 36 is driven in the reverse direction, and the spring holding box 24 is rotated five times in the reverse direction to return to the “first position” again.

  On the other hand, after the webbing is pulled out and the buckle is locked, the motor 36 is driven based on the ON signal of the buckle switch 70, and the spring holding box 24 is further rotated five times to move to the "second position". Thereby, the winding urging force by the mainspring spring 22 is minimized, and excessive pressure feeling at the time of wearing the webbing is reduced or eliminated, and comfort (wearability) is improved.

  Further, when the buckle is released again after being locked (when the buckle switch 70 is turned OFF), the motor 36 is driven in the reverse direction based on the OFF signal of the buckle switch 70, and the spring holding box 24 is set in the reverse direction 10. It is rotated and moved to the “first position” again. Thereby, the winding urging force by the mainspring 22 is maximized, and the entire webbing is quickly wound up.

  Thus, in the webbing take-up device 10 according to the present embodiment, the occupant's webbing operability and comfort during wearing can be further improved.

  Further, here, the webbing take-up device 10 according to the present embodiment includes a single printed circuit board 40 that constitutes a drive circuit of the motor 36 and drives the motor 36 in the forward and reverse directions. The single printed circuit board 40 detects the rotation position of the rotation direction of the spring holding box 24 and a predetermined rotation while detecting the rotation direction of the winding axis 12 and the rotation direction detection unit 68 that detects the winding rotation or drawing rotation (forward and reverse rotation direction). A holding box rotation position detection unit 66 in which a contact pattern is set according to the position is integrally provided.

  Therefore, the configuration of the printed circuit board 40 for realizing the tension reducer function and the webbing attachment assist function as described above is simple and simple, and each contact pattern (for example, its pattern length) of the holding box rotation position detector 66 is provided. Since the rotational position of the spring holding box 24 can be set arbitrarily according to the above, the webbing tension in the tension reducer function, the webbing take-up force in the webbing attachment assist function, etc. can be arbitrarily set, and the range of application is expanded. To do.

  In the above-described embodiment, the winding by the mainspring spring 22 is based on the “first position” (that is, the webbing is not pulled out) of the spring holding box 24 where the winding biasing force by the mainspring spring 22 is maximum. The “second position” of the spring holding box 24 at which the force is minimized is the state in which the spring holding box 24 is rotated, for example, 10 times, and the “third position” of the spring holding box 24 in which the winding biasing force by the mainspring spring 22 is in an intermediate force state. The “position” is configured such that the spring holding box 24 is rotated, for example, five times. However, the setting of the number of rotations (rotation position) of the spring holding box 24 is not limited to this, and the winding by the mainspring spring 22 is not limited thereto. It can be arbitrarily set in consideration of the urging force and the like.

  In the above-described embodiment, the MED pattern portion 86 is provided in the holding box rotation position detecting portion 66 of the printed circuit board 40, and the “third” of the spring holding box 24 in which the winding biasing force by the mainspring spring 22 becomes an intermediate force state. The position is set (detectable), that is, the spring holding box 24 is rotated five times from the “first position” of the spring holding box 24 when the webbing is not pulled out to become the “third position”. However, the intermediate state of the winding urging force can be omitted.

  That is, like the printed circuit board 100 shown in FIG. 11, only the COM pattern portion 104, the MAX pattern portion 106, and the MIN pattern portion 108 are used as the holding box rotation position detecting portion 102, and the winding biasing force by the mainspring spring 22 is maximized. The “first position” of the spring holding box 24 and the “second position” of the spring holding box 24 at which the winding biasing force by the mainspring spring 22 is minimized may be detected.

1 is an exploded perspective view showing a configuration of a webbing take-up device according to an embodiment of the present invention. It is sectional drawing which shows the structure of the webbing winding apparatus which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 2 showing the configuration of the webbing retractor according to the embodiment of the present invention. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 2 showing the configuration of the webbing take-up device according to the embodiment of the present invention. It is a front view which shows the structure of the principal part of the arm of the webbing winding device concerning an embodiment of the invention. FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 5 illustrating the configuration of the arm contact of the webbing take-up device according to the embodiment of the present invention. It is a front view which shows the structure of the principal part of the holder of the webbing winding device concerning an embodiment of the invention. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7 showing the configuration of the holder contact of the webbing retractor according to the embodiment of the present invention. It is a top view which shows the structure of the printed circuit board of the webbing winding apparatus which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the drive circuit of the motor of the webbing retractor which concerns on embodiment of this invention. It is a top view which shows the other example of the printed circuit board of the webbing winding apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Webbing winding device 12 Winding shaft 16 Adapter 22 Spring spring (spring)
24 Spring holding box 30 Worm gear (drive force transmission means)
36 Motor 40 Printed circuit board 42 Holder 48 Contact 52 Arm 56 Contact 58 Rotor 60 Friction spring 66 Holding box rotation position detector 68 Rotation direction detector

Claims (3)

A spring that is connected at one end to a winding shaft from which the webbing is wound and pulled out, and applies a winding biasing force to the winding shaft;
A spring holding box that is rotatably provided with the other end of the spring locked, and that rotates in the forward and reverse directions to change the set position of the spring, thereby adjusting the winding urging force by the spring;
A motor,
Driving force transmission means for connecting the motor and the spring holding box, and transmitting the rotational force of the motor to the spring holding box for rotation;
A single printed circuit board for configuring the motor drive circuit and driving the motor in forward and reverse directions;
In the webbing take-up device provided with
The single printed circuit board has a rotation direction detection unit that detects winding rotation or drawing rotation of the winding shaft, and a rotation pattern of the spring holding box, and a contact pattern is set according to a predetermined rotation position. The holding box rotation position detection unit is provided integrally,
A webbing take-up device characterized by that. The holding box rotation position detection unit of the single printed circuit board includes a rotation position of the spring holding box between when the webbing is pulled out until the buckle is locked and after the buckle is locked. The contact pattern is set so that
The webbing take-up device according to claim 1. The holding box rotation position detection unit of the single printed circuit board has a first position of the spring holding box where the winding biasing force by the spring is maximized, and the winding biasing force by the spring is minimized. The contact pattern is set according to the second position of the spring holding box and the third position where the winding biasing force by the spring is in an intermediate force state,
The spring holding box is in the first position when the webbing is not pulled out, and is in the third position after the webbing is pulled out until the buckle is locked, and after the buckle is locked, the spring holding box is in the third position. When it is released again after the buckle is locked, it becomes the first position.
The webbing take-up device according to claim 1 or 2, characterized in that

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