JPH0349774B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stop position control device (auto park device) that stops a wiper device for wiping the window glass of an automobile or the like at a fixed position.

As a conventional wiper stop position control device, there is one shown in FIG. 1, for example.

1 in the figure is a contact base that rotates together with a worm wheel constituting a deceleration mechanism of the wiper motor, and includes a first contact plate 2 that is circular and partially cut out in a fan shape, and a first contact plate 2 at the position of the cutout portion. It is constituted by a second contact plate 3 that is provided apart from the first contact plate 2 and extends radially outward from the first contact plate 2.

In addition, for the contact base 1, a power source 4
and the armature 5 and the second contact plate 3
A first contact 6 that can be contacted only with the contact, and a second contact 8 that is connected to the off terminal 7 and can be contacted with both the first contact plate 2 and the second contact plate 3 are provided. Each time the base 1 rotates once, the first contact 6 and the second contact 8 are brought into a connected state by the second contact plate 3. Further, the wiper blade (not shown) is configured to reciprocate once per rotation of the worm wheel provided with the contact base 1, and the wiper blade finishes wiping when both the contacts 6 and 8 are connected. It is configured to be in the position of

In the figure, 9 is a ground terminal, 10 is a high-speed operation terminal, 11 is a low-speed operation terminal, and 12 is a movable element connected to a wiper switch.

When the wiper switch is turned off at random while the wiper having the stop position control device configured as described above is in operation, the movable element 12 is turned off at the off terminal 7.
and the low speed terminal 11 are brought into contact. At this time, the wiper continues to operate because it is energized by the contact between the second contact 8 and the rotating first contact plate 2, and the second contact 8 is connected to the first contact plate 2. 2, the circuit of the power source 4 is interrupted, and then the second contact plate 3 connects both the contacts 6, 8, thereby shorting the armature 5 and applying a brake to the operation of the wiper. . Therefore, the wiper can always be forced to stop at the end of wiping.

However, in the conventional wiper stop position control device described above, as shown in FIG. Since the wiper blade 14 is configured to stop while being deformed in the direction, the wiper blade 14 is permanently deformed due to the effects of heat from sunlight and ultraviolet rays when the wiper is not in use, resulting in poor wiping and There were problems such as generation of vibration noise when wiping.

For this reason, some wiper blades are moved away from the glass surface to prevent deformation of the wiper blade when not in use, or are stored under the window so as not to obstruct the field of vision. If the wiper blade is arranged to be spaced apart in a structure that does not hold the wiper, the blade will have to be lifted for each reciprocating wiping operation, making it impossible to wipe the beginning and end of wiping sufficiently and making the structure more complicated. However, it has been difficult to implement this method because it has the disadvantage that it tends to generate operating noise due to lifting of the wiper.

This invention has been made in view of the above-mentioned problems, and it prevents permanent deformation of the wiper blade without separating the wiper blade from the glass surface.
It is an object of the present invention to provide a wiper stop position control device that can maintain good wiping performance over a long period of time.

The wiper stop position control device according to the present invention includes:
A wiper motor that swings the wiper blade back and forth;
A contact base is provided that rotates in conjunction with the wiper motor, and when the wiper blade reaches a reverse position on the stop side, it contacts the contact base together with a first contact to short-circuit the armature of the wiper motor. a switch mechanism with second and third contacts for armature shorting;
comprising a switching means for alternately switching power supply to the second and third contacts, each contact position of the second and third contacts with respect to the contact base;
The contact base is shifted in the direction of rotation corresponding to the amount of movement of the wiper blade from the end of reciprocation to immediately after the start of reversal, and in a more preferred embodiment, the switching means is comprised of a cam switch interlocked with the wiper motor. In a more preferred embodiment, the switching means is comprised of a self-holding relay that switches each time the wiper switch is turned on and off.

The present invention will be explained below based on the drawings.

FIGS. 3 to 7 are diagrams illustrating an embodiment of the present invention.

That is, the wiper stop position control device 20 shown in the figure has a switch mechanism 21 as shown in FIG.
, a cam switch circuit 22 which is a switching means, and a wiper switch 23.

As shown in FIG. 4, the contact base 24 in the switch mechanism 21 is configured to rotate together with a worm wheel 25 that constitutes a deceleration mechanism for a wiper motor (not shown).
A first contact plate 24 in which a part of the circle is cut out in a fan shape
a, and the first contact plate 24 at the position of the notch portion.
and a second contact plate 24b that is spaced apart from the first contact plate 24a and protrudes outward from the first contact plate 24a.

In addition, a power source 32 and an armature 26 are provided on the motor case side (not shown) with respect to the contact base 24.
A first contact 27 that is connected to and can contact only the second contact plate 24b, and a second contact 28 and a third contact 29 that can contact both the first contact plate 24a and the second contact plate 24b. is provided. These three contacts 27, 28, 29 together with the contact base 24 form an armature shorting contact, and constitute a switch mechanism that shorts the armature 26 of the wiper motor and forcibly stops it. They are provided in order from the outer circumferential side of the contact base 24 toward the center. Then, the contact base 2
In order to make the contact timings of the second contact 28 and the third contact 29 different from each other with respect to 4, the third contact 29 is arranged at a position shifted from the first contact 27 and the second contact 28 by a central angle θ. are doing. Then, the direction in which the third contact 29 comes into contact with the second contact plate 24b earlier than the second contact 28 (arrow A in FIG.
When the contact base 24 is rotated in the
In order to bring the third contact 29 and the first contact 27 into contact with the second contact plate 24b at the same time, an extension part based on the central angle θ is provided along the trajectory of the first contact 27 on the second contact plate 24b. 24c is formed.

The cam switch circuit 22 serves as a switching means for an armature short-circuiting contact that alternately switches energization to the second contact 28 and the third contact 29,
The cam switch 30 is composed of a third contact plate 31, a remaining large diameter portion 31a with approximately half of the outer periphery cut out, and a remaining small diameter portion 31b obtained by cutting out approximately the inner periphery of the large diameter portion plate 31a. There is. That is, the large diameter portion 31a and the small diameter portion 31b are provided with a phase shift of 180°.

Further, with respect to the cam switch 30, on the motor case side (not shown), there is a fourth contact 33 that can contact only the large diameter portion 31a of the third contact plate 31, and a fourth contact 33 that is always in contact with the third contact plate 31. Five contacts 34
and a sixth contact 35 that can contact only the small diameter portion 31b of the third contact plate 31 are arranged from the outer circumferential side of the cam switch 30 toward the center, and the fourth contact 33 is connected to the third contact 29. The fifth contact 34 is connected to the off terminal 36 of the wiper switch 23. The cam switch 30 is
As shown in FIG. 4, a gear 38 that engages with a small gear 37 that is pivotally attached to the shaft 25a of the worm wheel 25.
The motor shaft 3 rotates integrally with the motor shaft 3.
The worm wheel 25 is configured to rotate half a rotation for each rotation of the worm wheel 25 that is engaged with the worm 40 formed at the end of the worm wheel 9.

Further, the wiper blade 14 is configured to reciprocate once every time the worm wheel 25 rotates once, and the wiper blade 14 moves from a third contact 29 to a second contact, which are arranged offset based on the center angle θ in the switch mechanism 21. As shown in FIG. 5, the amount of rotational movement up to 28 is immediately after the wiper blade 14 moves from the reciprocating end position (the position indicated by the imaginary line) after wiping the surface of the glass 13 to the point where it reverses and starts wiping. This corresponds to the amount of movement l to the position (the position shown by the solid line).

In the wiper switch 23 in FIG. 3, reference numeral 41 is a ground terminal, 42 is a high-speed operation terminal connected to the armature 26, 43 is a low-speed operation terminal also connected to the armature 26, and 44 is a terminal connected to the armature 26 by human operation. This is a movable element that moves and connects each terminal.

Next, the operation of the wiper stop position control device configured as described above will be explained.

When the wiper switch 23 that has been switched on is randomly switched to the off side, the cam switch 30
When the large diameter portion 31a of the third contact plate 31 is located on the opposite side of the fourth to sixth contacts 33 to 35 (the state shown in FIG. 3), the sixth contact 35 The fifth contact 3
4. The third contact plate 31, the sixth contact 35, and the second contact 28 are connected to each other and the second contact 28 is connected to the second contact 28.
However, while in contact with the rotating first contact plate 24a, the fiber continues to operate.

As the worm wheel 25 rotates, the contact base 24 further rotates in the direction of arrow A in the figure, as shown in FIG. will be cut off. Next, as shown in FIG. 6b, when both the first contactor 27 and the second contactor 28 contact the second contact plate 24b, braking is started by short-circuiting the armature 26, and the As shown in Figure 6c, the first contact 27 and the second contact 2
8 is located within the range of the second contact plate 24b, the wiper stops.

At this time, the wiper is configured to stop at the stop-side reversal position at the bottom of the glass, at the position immediately after the start of reversal (the position of the wiper blade 14 shown by the solid line in FIG. 5).

Next, when the wiper switch of the wiper that has been switched on is randomly switched to the off side, the large diameter portion 31a of the third contact plate 31 in the cam switch 30
is located on the side of the fourth to sixth contacts 33 to 35 (the cam switch 30 in FIG. 3 is rotated 180 degrees), the fourth contact 33 is located on the third contact plate 31 Since the sixth contactor 35 is in contact with the large diameter portion 31a of the third contact plate 31 and is cut off from the small diameter portion 31b of the third contact plate 31, the low speed operation terminal 43 and the off terminal 36 connected by the movable element 44 , fifth contact 34, third contact plate 31, fourth contact 33,
The wiper continues to operate while the third contact 29 is in contact with the rotating first contact plate 24a.

As the worm wheel 25 rotates, the contact base 24 moves as shown in FIG.
The third contact 29 rotates further in the direction of arrow A in the figure.
When the contact plate 24a is removed from the first contact plate 24a, the power is cut off. Next, as shown in FIG. 7b, when both the first contact 27 and the third contact 29 contact the second contact plate 24b, braking is started by shorting the armature 26, and the As shown in FIG. 7c, the wiper stops while the first contact 27 and the third contact 29 are located within the range of the second contact plate 24b.

At this time, the third contactor 29 is configured to contact the second contact plate 24b earlier than the second contactor 28 by the amount of rotational movement due to the central angle θ (see FIG. 3), and The amount of rotational movement due to θ corresponds to the amount of movement l from the position where the wiper ends its reciprocation to the position immediately after it starts reversing, so braking starts earlier than when stopping with the first contact 27 and second contact 28 described above. Then, the wiper stops at the end position of the wiper blade 14 (the position of the wiper blade 14 indicated by the imaginary line in FIG. 5).

In other words, the direction of deformation of the wiper blade 14 is opposite between the position where the wiper is at the end of reciprocation and the position immediately after the start of reversal, and the deformation direction of the wiper blade 14 is opposite to that of the second contact 28 and the third contact 29 that determine these stop positions. Since the cam switch 30 alternately switches the energization of the worm wheel 25 for each revolution of the worm wheel 25 (one reciprocation of the wiper), the position at which the wiper will stop when the wiper switch is randomly turned off is 1/1 This will happen with a probability of 2.

Therefore, it is possible to prevent the wiper blade from always remaining deformed in one direction when the wiper is not in use.

FIG. 8 is a diagram illustrating another embodiment of the present invention.

In the embodiment described above, the third contact 29 is arranged at a position shifted by the center angle θ with respect to the first contact 27 and the second contact 28, and the second contact plate 24
In this embodiment, the first contact 27, the second contact 28, and the third contact 29 are arranged radially in a line from the center of the contact base 45 toward the outer circumference. Along with placing it in
By cutting out one end side of the track (indicated by a virtual line in the figure) of the third contactor 29 in the second contact plate 45b and providing an extension part 45c corresponding to the notch part on the other end side, the second contactor 29 can be 28 and the third contact 29 are made to contact at different times. And the extension part 45
The length c is set to be the same length as the amount of rotational movement on the orbit drawn by the third contactor 29 based on the central angle θ explained in the above embodiment.

Therefore, when using the contact base 45 configured as described above, the first contact 27
The wiper stop position caused by the second contact 28 and the wiper stop position caused by the first contact 28 and the third contact 29 can be made different in the same way as in the above-mentioned embodiment, thereby preventing permanent deformation of the wiper blade 4. It can be prevented.

FIG. 9 is a diagram illustrating still another embodiment of the present invention.

In the embodiment described above, the cam switch circuit 22 was used as a switching means for alternately switching the energization to the second contact 28 and the third contact 29, but the stop position control device 20' according to this embodiment A self-holding relay 46 is used as the switching means S.

The relay 46 has a movable contact 47 that switches between the second contact 28 and the third contact 29, and a fixed contact of the movable contact 47 is connected to the off terminal 36 of the wiper switch 23. 32 and the armature 26 and the off terminal 36
A relay coil 48 is connected between them. The relay 46 switches the movable contact 47 every time the movable element 44 of the wiper switch 23 is in the off position (the state shown in FIG. 9) and the relay coil 48 is energized. There is.

In addition, in the embodiment shown in FIG. 9, the second contactor 2
8 and the third contactor 29, the position of the third contactor 29 is shifted from the first contactor 27 and the second contactor 28 by a central angle θ. There is.

If the configuration uses a self-holding relay 46 as the switching means as in the above embodiment, the wiper stop position (see Fig. 5) can be reliably alternated each time the wiper switch is turned off. , it becomes possible to further improve prevention of permanent deformation of the wiper blade.

As explained above, the wiper stop position control device of the present invention can randomly change the stop position of the wiper blade when the wiper is not in use. The wiper blade is not allowed to remain in a deformed state, making it difficult to permanently deform the wiper blade, and maintaining good wiping performance over a long period of time.
It has excellent effects such as not requiring a device to separate the wiper blade from the wiped surface when the wiper is not in use.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram illustrating the configuration of a conventional wiper stop position control device, Fig. 2 is a cross-sectional view illustrating the cross-sectional shape of a wiper blade of a wiper in a stopped state, and Fig. 3 is a circuit diagram illustrating a wiper blade according to the present invention. Circuit diagram illustrating an embodiment of the stop position control device, No. 4
The figure is an explanatory diagram of the deceleration mechanism part of the wiper motor, explaining the arrangement of the contact base and the cam switch, and FIG. Figures 6a to 6c are explanatory diagrams sequentially showing the state of power cutoff, braking start and stop due to short circuit by the first contactor and the second contactor, and Figures 7a to c are the first contactor and the third contactor. An explanatory diagram illustrating the interruption of power supply by a contact, the start of braking due to a short circuit, and a stop state in sequence. FIG. 8 is an explanatory diagram illustrating the arrangement of a contact base and a contact according to another embodiment of the present invention. FIG. FIG. 7 is a circuit diagram illustrating still another embodiment of the wiper stop position control device according to the invention. 14... Wiper blade, 20, 20'... Stop position control device, 21... Switch mechanism, 22...
... cam switch circuit (switching means), 23 ... wiper switch, 24, 45 ... contact base,
27...First contact, 28...Second contact, 29
...Third contact, 30...Cam switch, 46...
...Self-holding relay (switching means), S...Switching means.

Claims (1)

[Scope of Claims] 1. A wiper motor that swings the wiper blade back and forth, and a contact base that rotates in conjunction with the wiper motor, and when the wiper blade reaches a reversed position on the stop side, a first contact is made. a switch mechanism comprising second and third contacts for armature shorting that contact the contact base together with the contact base to short-circuit the armature of the wiper motor; and alternately supplying power to the second and third contacts. The contact position of the second and third contacts with respect to the contact base is shifted in the rotational direction of the contact base in accordance with the amount of movement of the wiper blade from the end of reciprocation to immediately after the start of reversal. A wiper stop position control device characterized by: 2. The wiper stop position control device according to claim 1, wherein the switching means comprises a cam switch interlocked with the wiper motor. 3. The wiper stop position control device according to claim 1 or 2, wherein the switching means comprises a self-holding relay that switches each time the wiper switch is turned on and off.