JPH0453737B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a concealed type wiper device. [Technical Background of the Invention and Problems Therewith] As a conventional concealed type wiper device, there is one proposed in, for example, Japanese Utility Model Application No. 60-9756. As shown in FIG. 3, for example, the mechanism used in this conventional wiper device is such that a worm wheel 2 meshes with an armature shaft 1 driven by the rotation of a motor. Output gear 3 is engaged. When the output gear 3 rotates, the output shaft 4 also rotates, driving the wiper link and reciprocating the wiper. In addition, a contact wheel 5 is provided on the upper surface of the output gear 3.
is provided, and a protrusion 6 on the top surface of the output gear 3 is provided.
and the protrusion 7 on the lower surface of the contact wheel 5 come into contact with each other, and as the output gear 3 rotates, the contact wheel 5 also rotates at the same time. A contact plate 8 is provided on the upper surface of the contact wheel 5, forming an auto-stop circuit. The auto-stop circuit is shown in detail in Figure 4, which includes a power supply 9, a motor 10, and a wiper switch 1.
1 are connected in series, and a contact plate 8 is connected to the wiper switch 11 in a switchable manner. In such a conventional wiper device, when the wiper switch 11 is turned on, the motor 10 is driven by the power supply 9, and the output shaft is driven through the armature shaft 1, the worm wheel 2, and the output gear 3. 4, the output shaft 4 drives a wiper link (not shown),
Drive the wiper. and wiper switch 1
When the switch 1 is turned off, the contact of the wiper switch 11 is switched to the contact plate 8, and a wiper drive circuit is formed through the power supply 9, the motor 10, the wiper switch 11, and the contact plate 8. When the wiper moves back and forth once, the circuit is cut off by the contact plate 8, resulting in an auto-stop. In addition, as proposed in Japanese Patent Application Laid-Open No. 59-96031, after turning off the switching operation section 29, the lower inversion position L
By switching the stop position selection operation section 30, the wiper blade 1 stopped at 1 is moved to the upper reversal position L.
There is one that stops at 3. However, in such conventional concealed wiper devices, the wiper arm is completely retracted under the hood, resulting in a large recess in the wiper storage area, especially when parked during snowfall. Therefore, snow tends to accumulate, and once snow accumulates, it becomes difficult to remove it, leading to problems such as the wiper arm not being able to move due to the influence of snow. For this reason, it is possible to change the stop position of the wiper arm by installing a switch that changes the stop position in addition to the conventional wiper switch, but since a new switch is provided, there is a problem that the wiper motor may be driven due to incorrect operation of this switch. It was hot. [Object of the Invention] Therefore, the present invention provides a wiper device in which the wiper arm stops at a position below the hood and then stops at a position exposed above the hood by operating a switch. An object of the present invention is to provide a wiper device in which a wiper motor is not driven even if a switch for changing the stop position of a wiper arm is erroneously operated. [Structure of the Invention] In order to achieve the above object, the present invention includes a wiper motor that drives a wiper, a first switch that instructs the drive of the wiper, and a switch located below the hood of the vehicle. A first stop position of the wiper is provided, and a first contact point having an electrically conductive part is provided at a position other than the position corresponding to the first stop position, and the wiper motor 31 responds to the wiper when the wiper motor 31 rotates normally. The first contact wheel is stopped during reverse rotation, and the first switch is turned on until the wiper reaches the first stop position after the first switch is turned off.
A first drive circuit that drives the wiper motor in normal rotation through an electrically conductive portion of the first contact, a second switch that instructs to change the stop position of the wiper, and a switch located above the hood of the vehicle. a second stop position of the wiper at the first position;
a second contact point forming an electrically conductive portion from a position corresponding to the stop position of the wiper motor to a position corresponding to the second stop position, the second contact point being responsive to the wiper when the wiper motor rotates forwardly and reversely; and for driving the wiper motor in reverse through the electrical continuity of the second contact from when the second switch is turned on until the wiper reaches the second stop position. and a second drive circuit. As a result, after the wiper has stopped at the first stop position, by operating the second switch to change the stop position, the wiper motor starts reverse rotation, and the wiper motor starts rotating in reverse when the wiper is in the retracted state at the first stop position. The arm stops at a second stop position above the hood. Here, when the wiper motor reverses, the second contact wheel rotates in reverse in response to the wiper motor, but the first contact wheel remains stopped and does not reverse. Therefore, even if the second switch is accidentally returned to its original position at the second stop position, the first contact wheel will remain stopped as described above, and the wiper motor will not be driven forward. Wiper is second
This is to hold the stop position. [Embodiments of the Invention] Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 1 shows an embodiment of the present invention, in which an armature shaft 21 rotated by the rotation of a wiper motor 31, a worm wheel 22 that meshes with the armature shaft 21, and a worm wheel 22. An output gear 23 is provided as a second contact wheel that is rotated at a reduced speed.
The output shaft 24 of the output gear 23 is connected to a wiper arm link (not shown) and drives the wiper arm reciprocatingly. A first contact wheel 25 is provided above the output gear 23, and each projection 26,
27 makes it possible to rotate together. A contact plate 28 serving as an electrically conductive portion is provided on the upper surface of the contact wheel 25, and a fixed contact P that comes into contact with the contact plate 28 is further arranged. When the contact P is within the area of the contact plate 28, the wiper motor 31 is rotated in the normal direction (on state), and when it is out of the area of the contact plate 28, the wiper motor 31 is stopped (off state). become. Further, on the upper surface of the output gear 23, a contact plate 29 for temporary reverse rotation, which serves as an electrically conductive part, is provided, and a fixed contact Q that comes into contact with this contact plate 29 is further arranged. When the contact Q is within the area of the contact plate 29, the wiper motor 31 is reversed in the ON state, and when the contact Q is out of the area of the contact plate 29, it is switched to the OFF state where the wiper motor 31 is stopped. Become. On the other hand, the area of the contact plate 29 is set to be activated so that the contact Q comes off from the contact plate 29 when the wiper motor is slightly reversed. The circuit configuration of the wiper device is shown in FIG. 2, in which a power source 30, a wiper motor 31, and a wiper switch 32 serving as a first switch are connected in series. The contact plate 28 is configured to be switchable and connectable to the wiper switch 32. Further, between the power supply 30 and the motor 31, there is an open/close switch 33 that serves as a second switch of the temporary reversal circuit.
is inserted, and a contact plate 29 for temporary reversal is connected to this open/close switch 33. The other end of the temporary reversal contact plate 29 is the power supply 3
Connected to 0. The operation of the wiper device having the above configuration will be explained next.

[Normal operation]

When the wiper switch 32 is turned on, the power supply 3
0, wiper motor 31, wiper switch 32
A series circuit is constructed, and a first drive circuit in which the wiper motor 31 rotates in the forward direction is constructed. The armature shaft 21 is rotated by this drive of the wiper motor 31, which rotates the output shaft 24 via the worm wheel 22 and output gear 23, thereby driving a wiper arm (not shown).

[Auto stop]

Next, when the wiper switch 32 is turned off, the contact plate 28 is connected to the power source 30 via the power source 30, the wiper motor 31, and the wiper switch 32, and the wiper arm continues to operate until the output gear 23 rotates once. When the output gear 23 rotates once, since the contact wheel 25 is also rotating, the contact P that is in contact with the contact plate 28 above it is removed from the contact plate 28, and the power to the wiper motor 31 is cut off. Therefore, the wiper arm is stopped at the first stop position, which is the auto-stop position. When the wiper arm is thus stopped at the auto-stop position, in the case of a concealed type wiper device, the wiper arm is completely stored under the hood.

[Wiper reverse operation]

With the wiper arm stopped at the auto-stop position, the open/close switch 33 is turned on. This switching constitutes a second drive circuit that extends from the power source 30 to the temporary reversal contact plate 29 via the on/off switch 33. As a result, a voltage for reverse rotation is applied to the wiper motor 31, and the wiper motor 31 starts reverse rotation. This wiper motor 3
1, the output gear 23 and output shaft 24
is reversed, so the wiper link is driven in the opposite direction and the wiper arm is lifted from the autostop position toward the windshield. When the wiper motor 31 reverses, the contact Q of the contact plate 29 comes off the contact plate 29 and breaks this reverse circuit. Then, the reverse rotation of the wiper motor 31 is stopped, and the wiper arm is stopped in the lifted state. In this way, when the wiper switch 32 is turned on, the wiper is driven back and forth, and when the wiper switch 32 is turned off, it is stopped at the auto-stop position where the wiper arm is completely retracted under the hood. Furthermore, if the wiper motor 31 is temporarily reversed by turning on the on-off switch 33 for temporary reversal, the wiper arm is quickly stopped from the auto-stop position to the second stop position elevated above the hood. I can do it. As a result, the wiper arm can easily be placed in an inactive, upright position away from the windshield. [Effects of the Invention] As explained above, according to the present invention, after the wiper has stopped at the first stop position, the second switch is operated to move the wiper arm from the first stop position, which is the auto-stop position, from the hood. It becomes possible to change to the second stop position, which is the upper position. Furthermore, even if you operate the second switch by mistake after changing the wiper arm from the first stop position to the second stop position by operating the second switch as described above, the wiper motor will not be driven. The wiper arm never moves.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 is a circuit diagram of the above embodiment, FIG. 3 is an exploded perspective view of a conventional example, and FIG. 4 is a circuit diagram of a conventional example. 21... Armature shaft, 22... Worm wheel, 23... Output gear, 24... Output shaft, 25... Contact wheel, 26, 27...
...Protrusion, 28...Contact plate, 29...Temporary reverse contact plate, 30...Power source, 31...Wiper motor, 32...Wiper switch, 33...
…Open/close switch, P, Q…contact.

Claims (1)

[Claims] 1. A wiper motor that drives a wiper, a first switch that instructs driving of the wiper, and a first stop position of the wiper located below the hood of the vehicle, and a switch that corresponds to the first stop position. a first contact wheel having an electrically conductive portion formed at a position other than the position where the wiper motor 31 rotates; from turning on until the wiper reaches the first stop position after turning off the first switch;
A first drive circuit that drives the wiper motor in normal rotation through an electrically conductive portion of the first contact, a second switch that instructs to change the stop position of the wiper, and a switch located above the hood of the vehicle. a second stop position of the wiper at the first position;
a second contact point forming an electrically conductive portion from a position corresponding to the stop position of the wiper motor to a position corresponding to the second stop position, the second contact point being responsive to the wiper when the wiper motor rotates forwardly and reversely; and for driving the wiper motor in reverse through the electrical continuity of the second contact from when the second switch is turned on until the wiper reaches the second stop position. A wiper device comprising a second drive circuit.