JPH11271012A - Position detection device - Google Patents

Abstract

(57) [Problem] To provide a position detection device which can be set once after the initial position of a moving body is set once and accurately detect the position of the moving body. SOLUTION: An eccentric gear 49 pushed by an eccentric cam surface 10e of an output shaft 10 to rotate eccentrically, an internal gear 48 meshing with the eccentric gear 49, and a rotation plate 22 rotating with the rotation of the eccentric gear 49. A position detecting plate 24 urged by a diaphragm spring 25 via a friction member 23 to a rotatable plate 22 and rotatably supported; and a contact 19 slidably in contact with a wiring pattern 24a of the position detecting plate 24. With the rotation of 10, the eccentric gear 49 rotates eccentrically, and the rotation of the eccentric gear 49 pushes the projection 49a of the eccentric gear 49 to rotate the rotating plate 22, and in synchronization with the rotation, the position detection plate 24 rotates. When the projection 24b of the position detection plate 24 comes into contact with the stopper portion 15c on the non-rotation side, the rotation plate stops and the position detection plate is stopped. The initial setting is performed by the relative rotation of the gate 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a position detecting device, and more particularly to a structure for setting an initial position of a position detecting device.

[0002]

2. Description of the Related Art Conventionally, this type of entrapment detection device uses a pulse generator synchronized with the rotation speed of a motor in order to detect entrapment in a window glass that moves up and down, and according to a signal state from the pulse generator. One that detects the entrapment is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-324581. The entrapment detection device disclosed in this publication detects entrapment by counting a pulse change of an output shaft of a motor for moving a window glass up and down and comparing the pulse change with a predetermined threshold value.

In the detection of entrapment, when the windowpane is fully closed, it must be completely closed. Therefore, within a predetermined range (for example, fully closed to −4 mm) from the fully closed position of the windowpane, the inversion operation of entrapment should not be performed. The dead zone is provided (US FMVSS regulations). In order to satisfy this rule, it is necessary to accurately detect a range that is lower than the fully closed position of the window glass by a predetermined position.

In such a device, it is necessary to once close the window glass to the fully closed position after assembling the pinch detection device to the vehicle. At the fully closed position of the window glass, the load on the motor rises rapidly, so a lock current, whose current value rises rapidly, flows through the motor. Position). Once the initial position is determined, the position of the window glass can be detected by counting the number of pulses from the initial position.

[0005]

However, in the method of detecting the fully closed position by a pulse as described above, the window glass is once operated to the fully closed position to learn the initial position when the window glass is assembled to the vehicle. There is a need.

[0006] As described above, when the position of the window glass is detected by counting the number of pulses, when the battery is removed from the vehicle due to maintenance or failure of the vehicle, the fully closed position stored in the memory in the controller is electrically controlled. In the unstored state. For this reason, after connecting the battery again, it is necessary to drive the window glass again to the fully closed position to recognize the initial position. To avoid this, another power source may be provided in addition to the battery serving as the main power source, but this increases the cost.

In view of the above, the present invention has been made in view of the above-mentioned problems, and provides a position detecting device which can set once an initial position of a moving body and can always hold the position thereafter. It is a technical task to accurately detect the position of the object.

[0008]

The technical means taken to solve the above problems is an eccentric gear which is eccentrically rotated by being pushed by an eccentric cam surface provided on an output shaft for driving a moving body. An internal gear that has a different number of teeth than the eccentric gear and is fixed on the non-rotating side and meshes with the eccentric gear; a rotating plate that rotates with the rotation of the eccentric gear; A position detection plate operably supported and having a wiring pattern and a projection formed thereon, a contact fixed to the non-rotating side and slidably contacting the wiring pattern of the position detection plate, and a stopper portion to which the projection of the position detection plate can contact Having a non-rotating member having, and detecting the contact state with the wiring pattern of the position detection plate by the contact, to detect the position of the moving body,
When the eccentric gear rotates with the rotation of the output shaft, the rotation plate rotates due to the rotation of the eccentric gear, and when the projection of the position detection plate comes into contact with the stopper portion, the rotation of the rotation plate is reduced. The stop is that the position detection plate is relatively rotated.

With the above arrangement, when the output shaft for driving the moving body rotates, the output shaft is pushed by the eccentric cam surface of the output shaft, and the eccentric gear rotates eccentrically. Since the internal gear engaged with the eccentric gear is fixed to the non-rotating member, the rotation of the eccentric gear rotates the rotating plate. When the rotation plate rotates, the position detection plate supported via the friction member rotates, and the projection of the position detection plate rotates. Thereafter, when the projection of the position detection plate comes into contact with the stopper provided on the non-rotating member, the rotation of the position detection plate is stopped by the stopper, but the rotation plate tries to rotate even when the rotation of the position detection plate is stopped. Therefore, slippage occurs between the position detection plate and the rotating plate. As a result, the rotation plate rotates relative to the position detection plate, and the initial position of the position detection plate can be set.

That is, this configuration is applied to a vehicle,
When the moving body is a window glass, the rotation of the position detection plate stops at the fully closed position of the window glass where the projection of the position detection plate abuts the stopper portion on the non-rotating side, and the position detection plate stopped by the stopper portion. Since the contact is in contact with the wiring pattern at the position, the initial position of the position detection plate can be set. Therefore, even if the battery of the vehicle is removed after the initial position is set once, the setting of the initial position is mechanically stored, so that there is no problem that the setting is not stored in the memory of the controller as in the related art. That is, when the window glass is closed only once to the fully closed position when assembled to the vehicle, the fully closed position is maintained thereafter. Therefore, if the initial position is accurately set, the position of the window glass can be detected with high accuracy.

In this case, the position detecting plate is urged toward the rotating plate by an urging member locked on a flange formed in the radial direction of the rotating plate, and is synchronously rotated with the rotating plate by a frictional force with the friction member. If you do
It is possible to cause relative rotation with a simple configuration.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Here, an example in which the present invention is applied to the pinch detection device 100 in a vehicle is shown, but the present invention is not limited to this, and can be applied to a sunroof device and the like.

As shown in FIG. 8, a power window of a vehicle or the like uses a motor 1 to move a window glass (moving body) 30 up and down along a window frame 32 of a door frame 31 by a lifting device 20. . The lifting device 20 includes a wire type and an X type link mechanism.
Here, the one provided with the X-type link mechanism 21 will be described.

The lifting device 20 having the link mechanism has the upper end of the link mechanism 21 fixed to the lower end of the window glass 30. The lower end is fixed to a door panel 22 and the other is a power window motor device 1 having a motor 1.
When the motor 1 is operated, the lifting / lowering device 20 bends and extends to move the window glass 30 up and down.

In such an apparatus, when a hand or an object (hereinafter referred to as E) is sandwiched between the window glass 30 and the window frame 32 when the window glass is raised in recent years, the window glass 30
Is added to the motor device 10 to stop the ascending operation of the motor and immediately reverse the operation to the descending operation. Further, a position detecting device (hereinafter, referred to as a detecting device) that detects the position of the window glass 30 so as to accurately control the entrapment. An entrapment detection device to which a position detection mechanism is added is known, and an entrapment detection device 100 including such an entrapment detection mechanism and a position detection mechanism will be described below.

First, the entrapment detection mechanism of the entrapment detection device 100 will be described with reference to FIGS.
A motor 1 serving as a driving source of the pinch detection device 100 is fixed to a cylindrical housing 2 by a fixing member such as a screw or a bolt. A worm wheel 4 made of resin having external teeth is rotatably provided inside a cylinder of the housing 2 via a boss portion provided with a bush 9 provided integrally with the housing 2. The worm wheel 4 meshes with a worm 5 provided at the end of the motor output shaft. When the motor 1 rotates, the worm 5 rotates, and the worm wheel 4 rotates with the rotation.

The boss 4a provided at the center of the worm wheel 4 has a pair of spaced grooves 4b on its outer peripheral surface. Is provided. This ring spring has a ring shape, and here an assembled body of three springs 8a, 8b, 8c having a shape as shown in FIG. 3 is used. Note that the ring spring 8 may be formed of one member.

The two end faces of the ring spring 8 are
The butt end face 8d is formed in a ring shape, and the butt end face 8 is disposed in the groove 4b from the outer periphery of the boss 4a with the butt end face 8 expanded. Thereafter, the output shaft 10 having the O-ring 7 fitted therein is inserted through the housing 2 and the center of the boss 4a. The output shaft 10 drives a drive gear (not shown) of the link mechanism 21 via the gear 10a,
The window glass 30 is moved up and down.

On the other hand, the output shaft 10 and the tension plate 1
1 is such that a gear surface 11b provided at the center of the tension plate 11 is fitted to a gear surface 10c provided in the middle of the output shaft 10, so that the output shaft 10 and the tension plate 11 rotate integrally. The tension plate 11 is provided so as to face the ring spring 8, and in this state, the claw 11 a provided on the ring spring side of the tension plate 11 is provided between the butted end surfaces 8 d of the ring spring 8.

Further, with the printed circuit board body 13 placed on the tension plate 11,
After the fixing plate 14 is put on the printed board so as to fix the fixing plate 14 and the tension plate 11, the fixing pins 14 a provided at two places on the fixing plate 14 are inserted into the holes of the printed board 13 and the tension plate 11. The tip of 14a is heat-scrambled from the back of the tension plate 11. For this reason, the printed circuit board 13 is fixed to the tension plate 11 and can be integrally rotated.
In a groove provided above the gear surface 10c of the output shaft 10,
A ring member (not shown) is fitted so that the output shaft 10 does not come off, so that the output shaft 10 does not come off.

A gear bracket 15 serving as a non-rotating member is placed on the fixed plate 14 in a state where the gear bracket 15 is hooked on the housing 2 by a claw portion 15b, and is fixed to the housing 2. Further, the contact 19 is fixed to the contact mounting position 15a of the gear bracket 15 with a screw or the like.
Out of the five terminals of the printed circuit board 9
3 is brought into contact with the surface on which the switch section is formed.

Next, the operation of the pinch detection mechanism will be described. When the motor 1 rotates in one direction to raise or lower the window glass 30, the worm 5 provided on the motor output shaft rotates the worm wheel 4.
At this time, the protrusion 4d provided on the inner periphery of the worm wheel 4 comes into contact with the butted end face 8d of the ring spring 8, and the end face 8d and the claw 11a of the tension plate 11 are engaged, so that the tension plate 11 rotates. The output shaft 10 is rotated by the rotation of the tension plate 11, the gear 10a is driven, and the window glass 30 is raised or lowered.

However, while the windowpane is being raised, a hand or an object (for example, E shown in FIG. 1) is sandwiched between the windowpane 30 and the window frame 32 of the door frame 31, and a load is applied to the windowpane 30. And the claw 1 of the tension plate 11
1a pushes one of the butted end faces 8d of the ring spring 8. Then, the ring spring 8 expands inside the worm wheel, and relative rotation occurs between the worm wheel 4 and the tension plate 11. As a result, a change in the state of contact with the pattern wiring formed on the surface of the printed circuit board body 13 fixed to the tension plate 11 and performing the same rotation is detected by the two terminals of the contact 19, so that pinching occurs. You know

More specifically, on the back side (the worm wheel side) of the printed circuit board 13, as shown in FIG.
a, the first switch portion 13a is provided with a second switch portion 13b which is spaced apart in the circumferential direction and is separated from each other in an arcuate pair, and a non-switch portion 13c formed between the two switches 13a and 13b. ing.

From the arc-shaped opening 11c provided inside the tension plate 11, a shoe 16 formed of a conductor member provided in the boss 4a of the worm wheel 4 and disposed in the terminal mounting portion 4c is formed. The printed circuit board 1 receives the urging force of the spring 6 disposed below the shoe 16.
The switch portion 3 is in contact with the back surface. For this reason, the shoe 16 is always in sliding contact with any one of the first switch portion 13a, the second switch portion 13b, and the non-switch portion 13c of the printed circuit board 13, and the conduction or non-conduction signal by the shoe 16 is transmitted through the through hole. The light is guided to two circumferential patterns provided above the printed circuit board 13, and is detected by two terminals of the contact 19.

Normally, while the window glass 30 is being raised and lowered, the shoe 1
No. 6 is located in the non-switch portion 13c, and there is no electric signal input to the contact 19 (the state where there is no short circuit). However, during the rising of the window glass, the shoe 16 is moved to the second switch section 1.
3b, when a signal that turns on the second switch section 13b (short state) enters the contact 19, the controller 3 detects the occurrence of pinching based on the signal, and the rising window glass 30 is detected. Operation is stopped, and an operation of immediately descending is performed.

Next, a position detecting mechanism added to the entrapment detecting mechanism will be described.

This position detecting mechanism is for detecting an accurate position of the window glass 30, and is eccentrically rotated by being eccentrically pushed by an eccentric cam surface 10e provided on the output shaft 10 for driving the window glass 30. A gear 49, an internal gear 48 having a different number of teeth than the eccentric gear 49 (the number of teeth is greater than the fractional number of the eccentric gear 49), fixed to the non-rotating side, and meshing with the eccentric gear 49 by internal teeth; A rotating plate 22 that rotates coaxially with the output shaft 10 with the rotation;
2, a position detection plate 24 rotatably supported by a diaphragm spring 25 via a friction member 23 and provided with a wiring pattern 24a and a projection 24b on a part of the outer periphery thereof, A contact 1 which is fixed at the mounting position 15a and whose three terminals are in sliding contact with the wiring pattern 24a of the position detecting plate 24.
9 and the projection 24 when the position detection plate 24 rotates.
The gear bracket 15 has a stopper portion 15c at a position where the gear bracket 15 can come into contact with the gear bracket 15b.

This position detecting mechanism detects a position 4 mm (insensitive area) and 200 mm (position at which the motor 1 stops rotating after the motor 1 reversely rotates when the pinch occurs) from the fully closed position of the window glass 30. And FM
Wiring pattern to satisfy VSS (US regulations)
It is formed on the surface of the position detection plate 24 in the shape shown in FIG. With respect to the wiring pattern 24a, FIG.
In the positional relationship between B and C, three terminals of the contact 19 are always in sliding contact with each other, and a contact state where the terminal is switched by conduction / non-conduction with the wiring pattern 24a is detected by the terminal, and the position of the window glass 30 is accurately detected. I can do it.

The position detecting plate 24 and the friction member 23 of the position detecting mechanism are sub-assembled to the rotating plate 22 by a diaphragm spring 25. As shown in FIG. 6, the rotating plate 22 has a step 22b on one side.
And a concave shape on the other side. A ring-shaped friction member 23 is disposed in the annular groove 22a coaxial with the output shaft 10 on the convex side. Rotating plate 22
The position detection plate 24 is disposed so as to face the friction member 23 in a state of being positioned in the circumferential direction on the step portion 22b. In this case, the projection 2 of the position detection plate 24
4b may be provided in the axial direction.

When attaching the diaphragm spring 25 with the position detecting plate 24 disposed on the friction member 23, the lower annular base portion of the diaphragm 25 is brought into contact with the position detecting plate 24 on the peripheral surface. . On the other hand, the four claw portions 25 a swelling in the axial direction of the diaphragm spring 25 are provided on the convex portion side of the rotating plate 22.
By rotating the diaphragm spring 25 clockwise or counterclockwise in a state where it is pressed into the inside of each of the two flange portions 22f, the rotating plate 2 is rotated.
2 are fitted into the fitting holes 25b of the diaphragm springs corresponding to the positioning pins 22c provided at four places, so that each claw portion 25a corresponds to the corresponding rotating plate 22.
Is fitted and fixed inside the flange portion 22f.

With such a structure, the position detecting plate 24 is moved by the diaphragm spring 25 to the friction member 2.
3, the friction member 2 is urged toward the rotating plate 22 to generate frictional force.
The position detecting plate 24 rotates synchronously with the rotating plate 22 due to the frictional force with the rotating member 3.

With respect to the configuration, after positioning the internal gear 48 with the positioning pin of the internal gear 48 with respect to the output shaft 10 penetrating the gear bracket 15 and fixing the internal gear 48, the eccentricity of the output shaft 10 is obtained. Cam surface 10e
The eccentric gear 49 is inserted in a rotatable state. Thereafter, the four projections 49a provided on the upper part of the eccentric gear 49
Is mounted on the housing 2 from above, and is fixed to the housing 2 with a fixing member such as a screw while being supported by a circular groove 22g provided on the back side of the sub-assembled rotary plate. The contact 19 is fixed to the contact mounting position 15a of the gear bracket 15 so that the three terminals of the contact 19 slide on the surface of the wiring pattern 24a when the position detection plate rotates.

Next, the operation of the position detecting mechanism will be described. When the output shaft 10 rotates with the rotation of the motor 1, the eccentric gear 49 rotatably disposed on the eccentric cam surface 10e provided on the output shaft 10 rotates eccentrically. At this time, the eccentric gear 49 meshes with the internal gear 48, but since the internal gear 48 having a greater number of teeth than the eccentric gear 49 is fixed to the non-rotating gear bracket 15, the non-rotating Eccentric gear 4 along the internal gear 48
9 rotates while being eccentric. That is, if the output shaft 10 makes one rotation, the eccentric gear 49 is shifted with respect to the internal gear 48 fixed to the gear bracket 15 by the difference in the number of teeth between the internal gear 48 and the eccentric gear 49.

At this time, four projections 49a are provided on the upper part of the eccentric gear 49, and the projections 49a are rotatable in circular grooves 22g provided on the back surface of the rotating plate 22, so that they are eccentric. The positions of the projections 49a associated with the rotation of the gear 49 perform eccentric rotation within the groove portion 22g, and revolve around the output shaft 10 while eccentric rotation (see FIG. 7). Therefore, when the eccentric gear 49 rotates, the rotation plate 22 is rotated by being pushed by the projection 49a with the rotation. When the rotating plate 22 rotates in this manner, the friction member 2 is placed on the rotating plate.
The position detection plate 24 disposed via the rotation member 3 rotates by the frictional force with the friction member 23.

On the other hand, a stopper 15c is provided on the gear bracket 15 on the rotation locus of the projection 24b so as to stop the rotation of the projection 24b provided on the position detecting plate 24. For this reason, the position detection plate 24 rotates,
When the stopper 24c rotates to a predetermined position, the protrusion 24b of the position detection plate 24 comes into contact with the stopper 15c. When the projection 24b of the position detection plate comes into contact with the stopper 15c, the rotation of the position detection plate 24 is stopped by the stopper 15c, but the rotation of the output shaft 10 is not stopped yet, and as a result, the frictional force of the friction member 23 is resisted. As a result, the rotation plate 22 slides with respect to the position detection plate 24, and the position detection plate 24 and the rotation plate 22
And a relative rotation occurs.

In order to position the position detecting plate 23 of the pinch detection device 100 using such a structure, the motor 1 is rotated to the window glass rising side before the pinch detection device 100 is assembled to the vehicle in advance. Then, the projection 24b of the position detection plate 24 is securely
Is made to be able to come into contact with the stopper portion 15c provided on the vehicle, and the operation of raising the window glass 30 to the fully closed position after assembling the vehicle is performed.

When such an operation is performed, the output shaft 10 is rotated by the power of the motor 1, and the eccentric gear 49 is rotated by the eccentric cam surface 10e with the rotation of the output shaft 10, and the eccentric gear 49 is eccentrically rotated by the eccentric rotation. The gear 49 is displaced along the tooth surface of the internal gear 48, and is pushed by the projection 49 a of the eccentric gear 49 so that the rotating plate 22 rotates. When the rotating plate 22 rotates, the position detecting plate 24 that rotates synchronously with the rotating plate 22 by the frictional force becomes the gear bracket 15.
The protrusion 24b comes into contact with the stopper portion 15c of the second position, and the rotation of the position detection plate 24 is restricted by the stopper portion 15c. However, in this case, the rotation of the output shaft 10 does not stop, and the rotating plate 22 further rotates. Therefore, the rotating force of the rotating plate 22 overcomes the frictional force of the friction member 23, and slip occurs, and the position detecting plate 24 On the other hand, the rotating plate 22 rotates relatively.

At this time (when the window glass is fully closed), the controller 3 detects the motor lock current flowing through the motor 1 and stops the rotation of the motor. Fixed. That is, the position of the position detection plate 23 at this time is initially set as the position when the window glass 30 is fully closed, and if the initial position is known, the contact state with the wiring pattern 24 a is detected by the terminal of the contact 19. Thereby, an accurate predetermined position (−−) from the fully closed position of the window glass 30 is obtained.
4 mm, -200 mm) can be detected.

Therefore, before assembling the pinch detection device 100 to the vehicle, the motor 1 is rotated upward, and then the window glass 30 is closed to the fully closed position. An initial position (coincident with the fully closed position of the window glass 30) can be set. Since the initial position of the position detection plate 24 can be mechanically set in this manner, once the initial position is stored,
Even if the battery of the vehicle is removed, the conventional problem that the stored initial position is not stored in the memory of the controller does not occur, and the initial position of the position detection plate 24 can be set with a simple configuration. .

[0041]

According to the present invention, there is provided an eccentric gear that is eccentrically rotated by being pushed by an eccentric cam surface provided on an output shaft for driving a moving body, and has a different number of teeth from the eccentric gear and is fixed to a non-rotating side. An internal gear that meshes with the eccentric gear, a rotation plate that rotates with the rotation of the eccentric gear, and a position detection plate that is rotatably supported on the rotation plate via a friction member and has a wiring pattern and protrusions formed thereon. A contact fixed to the non-rotation side and slidingly contacting the wiring pattern of the position detection plate; and a non-rotating member having a stopper portion with which a projection of the position detection plate can abut. The contact state is detected by the contact, to detect the position of the moving body,
When the eccentric gear rotates with the rotation of the output shaft, the rotation plate rotates due to the rotation of the eccentric gear, and when the projection of the position detection plate comes into contact with the stopper portion, the rotation of the position detection plate Is stopped and the rotating plate is relatively rotated, so that when the output shaft for driving the moving body rotates, the output shaft is pushed by the eccentric cam surface of the output shaft, and the eccentric gear rotates eccentrically. Since the internal gear engaged with the eccentric gear is fixed to the non-rotating member, the rotation of the eccentric gear rotates the rotating plate. When the rotation plate rotates, the position detection plate supported via the friction member rotates, and the projection of the position detection plate rotates. afterwards,
When the projection of the position detection plate comes into contact with the stopper provided on the non-rotating member, the rotation of the position detection plate is stopped by the stopper. However, even if the rotation of the position detection plate is stopped, the rotation plate tries to rotate,
Slip occurs between the position detecting plate and the rotating plate.
As a result, the rotation plate rotates relative to the position detection plate, and the initial position of the position detection plate can be set.

That is, this configuration is applied to a vehicle,
When the moving body is a window glass, the rotation of the position detection plate stops at the fully closed position of the window glass where the projection of the position detection plate abuts the stopper portion on the non-rotating side, and the position detection plate stopped by the stopper portion. Since the contact is in contact with the wiring pattern at the position, the initial position of the position detection plate can be set. Therefore, even if the battery of the vehicle is removed after the initial position is set once, the setting of the initial position is mechanically stored, so that there is no problem that the setting is not stored in the memory of the controller as in the related art. That is, when the window glass is closed only once to the fully closed position when assembled to the vehicle, the fully closed position is maintained thereafter. Therefore, if the initial position is set accurately, the position of the window glass can be detected with high accuracy.

In this case, the position detecting plate is urged toward the rotating plate by an urging member locked on a flange formed in a radial direction of the rotating plate, and is synchronously rotated with the rotating plate by a frictional force with the friction member. If you do
The relative rotation can be generated with a simple configuration.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a pinch detection device having a pinch detection mechanism and a position detection mechanism according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA shown in FIG.

FIG. 3 is a top view of the pinch detection mechanism according to the embodiment of the present invention.

FIG. 4 is a plan view showing a wiring pattern of a printed circuit board of the pinch detection mechanism according to the embodiment of the present invention.

FIG. 5 is a plan view showing a wiring pattern of a position detection plate of the position detection mechanism according to the embodiment of the present invention.

FIG. 6 is an assembly diagram showing an assembly of a position detection plate of the position detection mechanism according to the embodiment of the present invention.

FIG. 7 is a diagram showing a relationship between a rotation plate of a position detection mechanism and a projection of an eccentric gear according to an embodiment of the present invention.

FIG. 8 is a mounting diagram when the motor device is mounted on a windowpane elevating device of a vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 10 Output shaft 10e Eccentric cam surface 15 Gear bracket (non-rotating member) 15c Stopper portion 19 Contact 22 Rotating plate 22f Flange portion 23 Friction member 24 Position detection plate 24a Wiring pattern 24b Projection 25 Diaphragm spring (biasing member) 30 Window Glass (moving body) 48 Internal gear 49 Eccentric gear 49a projection 100 Entrapment detection device

Claims (2)

[Claims] An eccentric gear which is eccentrically rotated by being pushed by an eccentric cam surface provided on an output shaft for driving a moving body, has a different number of teeth from the eccentric gear, is fixed to a non-rotating side and meshes with the eccentric gear. An internal gear that rotates, a rotation plate that rotates with the rotation of the eccentric gear, a position detection plate that is rotatably supported on the rotation plate via a friction member, and on which a wiring pattern and a projection are formed; A contact fixed to the side and slidingly contacting the wiring pattern of the position detection plate; and a non-rotating member having a stopper portion to which a protrusion of the position detection plate can contact, and a contact state with the wiring pattern of the position detection plate. And the position of the moving body is detected by the contact, and the eccentric gear rotates with the rotation of the output shaft, and the rotation of the eccentric gear causes the rotation. Rate is rotated, when the projection of the position detecting plate comes into contact with the stopper portion, the position detecting device said position detecting plate stops rotation of the rotary plate, characterized in that the relative rotation. 2. The position detecting plate is urged toward the rotating plate by an urging member locked on a flange formed in a radial direction of the rotating plate, and the position detecting plate is urged by a frictional force with the friction member. Position detection device that performs synchronous rotation with the rotating plate.