JPS6189150A - Wiping device for windshield of car - Google Patents

Abstract

PURPOSE:To improve the durability of a wiping device by applying a signal from a stop position detecting switch to a control circuit so as to enable a relay to function a stop motion at the fixed position. CONSTITUTION:A relay 13 is connected to an electric power source with its one terminal end and is also connected to an output stage transistor 21 of a relay control circuit E with the other terminal end. A moving vane 14 which is linked with the relay 13 is connected with a wiper motor A through a wiper switch B. Then, a rectangular wave oscillating circuit C to produce an intermittent time and a control transistor 22 of the relay control circuit E are connected to the electric power source 17 through the wiper switch B. A switch A which detects the stop position while being synchronized with the wiper motor A is grounded at its one terminal end and is connected to the transistor 22 at the other terminal end.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile front glass cleaning device, and more particularly to an improvement in a fixed position stop relay.

Conventionally, a front glass cleaning device for an automobile has a 114-piece construction in which a blade automatically stops at the lower end of the front glass to ensure the driver's visibility in the +IIR direction when the device is not in use. As shown in Fig. 1, the structure of this device is as shown in Fig. 1. When the fixed position automatic stop relay A' of the wiper motor A, that is, the conductive plates 2 and 3 on the reduction gear 1; 1 rotates and when the blade (not shown) reaches the stopping position at the lower end of the front glass, the reduction gear 1
The upper contact pieces 5 and 6 are short-circuited on the conductive plate 2 to form a closed circuit, and the rotor 7 of the wiper motor A is actuated and stopped at a fixed position.

However, recently, an intermittent device C has been added to automobile front glass cleaning devices that automatically wipes the glass intermittently once every 3 to 60 seconds when continuous operation is not required, such as when there is light rain. Ta. That is, the intermittent device C consists of an oscillating section C' consisting of an astable multi-valve regulator, etc., and an output section C'',
When the intermittent device operation switch 8 is turned on, the transistor 9
The oscillator C' consisting of the transistor 10 oscillates, and the oscillation output is applied to the base of the transistor 12 through the resistor 11 of the output section. Relay 13 is energized,
The movable piece 14 of the relay 15 is connected to the No contact 1 from the NC contact 15.
3, switch from Terry 17 to Jeterf wiper switch B (wiper motor Lo → relay COM) →
A current 11 flows from the movable piece 14 to the NO contact 13 to the ground, and the wiper motor A operates. However, since the oscillation output is set to a time shorter than one wiping of the blade, the movable piece 14 is closed from the No contact 13 before the blade finishes one wiping.
It returns to contact 15, but since wiper switch B is in the stop position, battery 1 fu 40 - turf → wiper switch B (wiper motor Lo → relay COM)
- Movable piece 14 - N C contact 15 - Contact piece 6 - Conductive plate 3 -
Current I2 flows to ground and operation continues. Next, the reduction gear rotates 10 times and when the contact pieces 5 and 6 come onto the conductive plate 2, the above-mentioned closed circuit is formed and the operation stops. This operation is repeated while the intermittent device operation switch 8 is turned on. For this reason, the electrical intermittent operation frequency of the fixed position automatic stop relay A is increased several hundred times compared to the conventional IF surface glass cleaning device for automobiles that does not have an intermittent device, and the fixed position automatic stop relay A' is operated by the wiper motor. Since the entire current of 2 to 3 amperes flowing through A is cut off, contact pieces 5 and 6 are caused by electric sparks.
There was a problem that the front glass cleaning device for automobiles suffered from increased wear and tear, which shortened the lifespan of the vehicle front glass cleaning device.

The present invention incorporates an intermittent device into an automotive IFJ surface glass cleaning device from the beginning, replaces the fixed position automatic stop relay with a simple switch for simply detecting the stop position, and eliminates the minute current from the switch for detecting the stop position. To provide an apparatus that improves the durability of an automobile front glass cleaning device by inputting a signal into a control circuit made of a semiconductor to control a relay to perform a fixed position stopping operation, and also improves the precision of the fixed position stopping operation. It is.

An example of the implementation of the present invention will be described below with reference to the drawings. In FIG. 2, the front glass for an automobile of the present invention i+'? P.J.
Wiper switch (B+, wiper motor A,
Relay part D, relay control circuit E, square wave oscillation circuit (C)
The wiper switch (B+
indicates that the position marked with a circle is connected with a solid line in switch 7, which can select from four operating positions: stop, intermittent, low speed, and high speed, shown in the upper part of the figure, is connected inside the switch, and the right side The display shown in shows the connection destination from the circle mark, and the connection destination is given the same symbol as the wiper switch (Bl).

Next, the wiper motor A is equipped with a stop position detection switch (N, consisting of a conductive plate 6 and a contact piece 5 provided on the reduction gear 1 of the wiper motor A and a rotor 7).

(Al is set so that the conductive plate 6 and contact piece 5 touch when the blade (not shown) on the 011 side glass comes to the lower end where the driver has no full field of view in the +itJ direction. Based on this statement, the relay described later The control circuit E is connected through a diode and a resistor so that it can be controlled.The stop position detection switch (N can be of any type such as mechanical, electrical, optical, or magnetic).Next, the relay section Riha relay 1
3, a movable piece 14, an NC contact 15, and an NC contact 13. When the output stage transistor 21 of the relay control circuit E becomes conductive, the relay 13 is energized, the movable piece 14 switches to the NC contact 13 side, and the battery NC contact 13 from 17
After that, the wiper motor A' and E are supplied. Next, the relay control circuit E includes a control transistor 22 and a collector resistor 23, 24. Base resistance 25.
Emitter resistance 26. It is composed of a reverse current prevention diode 67 and an output stage transistor 21,
When B) is placed in the stop position, the wiper switch (
The voltage that enters the relay control circuit E via the input stop terminal 58 from B) is passed through the resistors 25 and 25 to the transistor 2.
2, and the wiper switch FBl f
! : When placed in the intermittent position, the oscillation output from the rectangular wave oscillation circuit (C) is applied to the base of the transistor 22 through the resistor 25 to energize it, and the output is applied to the base of the transistor 21 to energize it and activate the relay 13. Control is performed to reverse the movable piece 14 to the No contact 13. Also, when the wiper switch (Bl) is placed at the stop position, the stop position detection switch (N) reaches a predetermined position, and when the conductive plate 6 and contact piece 5 are in contact, the base of the transistor 22 is connected to the diode 27.
Resistance 28. is grounded through the stop position detection switch (Al) to stop the energization of the transistor 22, and control to stop the energization of the transistor 21 and restore the movable piece 14 of the relay 13, and the wiper switch (
When Bl is placed at low speed and high speed, the voltage that enters from the battery (+) of the wiper switch (B) from the battery 17 through Hi and LO of the relay control circuit is transferred to the diode 29. Resistor 50 and diode 61. resistance 32
This is a circuit that controls the relay 15 by directly applying current to the base of the transistor 21 through the contact 15, and inverting the movable piece 14 of the relay 15 from the NC contact 15 to the No contact 13. Next, the rectangular wave oscillation circuit (fc) is a rectangular wave oscillation circuit such as an astable multivibrator, and the time length of the oscillating output is set to be shorter than the time required to wipe one blade. The output terminal 6 is connected to the base of the transistor 22 via the resistor 25 of the relay control circuit E, and the above-mentioned oscillation output causes the relay control [DI&H's base potential of the transistor 22 to be fully raised to energize the transistor 22, which in turn turns on the wiper. Start motor A. The connections between each device are as shown in FIG.

Next, the operation of the automobile front glass cleaning device of the present invention will be explained. (1) Operation when the wiper switch (B) is placed in the low speed position When the wiper switch (B) is placed in the low speed position, the battery 17 Wiper switch (B) (buffer switch l+l
→ Relay control circuit Lo) → Diode 61 → Resistor 62 →
A voltage is applied to the base of the transistor 21, and the transistor 21 is energized, so the relay 13 is activated, and the movable piece 14 is reversed from the NC contact 15 to the No contact 13.
From battery = 17, No. contact 13 - movable piece 14 -> wiper switch (B) (relay C0M x wiper motor L
Current flows from O) → rotor 7 → earth, and wiper motor A rotates.

(2) Operation when the wiper switch (B+ is set at high speed) This is similar to when the wiper switch FB+ is set at low speed, so the explanation will be omitted.

(6) Operation when the wiper switch (B) is returned to the stop state When the wiper switch (Bl) is returned to the stop state, the wiper switch (Bl (Bag Terry (+
)→Relay control circuit OFF ) - A voltage is applied to the base of the transistor 22 through the resistor 23 and the resistor 25, and the transistor 22 is energized.As a result of the energization, a voltage is applied to the base of the transistor 21 through the diode 67, and the transistor 21 is also turned off. Since it is energized, relay 1
The wiper motor A continues to operate in the same manner as before returning the wiper switch (Bl) to the stop position.Next, the reduction gear 1 rotates and the conductive plate 6 and the contact piece 5 contact the stop position detection switch (Bl). Then, the base of the transistor 22 of the relay control circuit E is grounded through the diode 27 and the resistor 28 and through the stop position detection switch (At), so the transistors 22 and 21 are de-energized, so the relay 1
The movable piece 14 of No. 3 returns from the No contact 13 to the NC contact 15, ground → rotor 7 → wiper switch, Ji (B) (wiper motor Lo → relay COM) → movable/movable piece 14 → N
A closed circuit of C contact 15 is created, and the rotor is suddenly braked and stopped at the fixed position. (4) Wiper switch (Operation when Bl is intermittently turned to blue)
From battery 17 to wiper switch (B) (buffer battery (+l - (C) ”) - square wave oscillation circuit (C1;
When iz pressure is applied, it oscillates. The oscillation output is transmitted from the output terminal 36 of the oscillation circuit to the resistor 24 and the resistor 25 of the relay control circuit.
The transistor 22 is then applied to the collector pace, so the transistor 22 is energized, and since a voltage is applied to the transistor 21 pace through the diode 67, the transistor 21 is also energized, the relay 13 is activated, and the movable piece 14 is connected to the NC contact 15. Since it is reversed from the battery to the No contact 13, the No contact 13 - movable piece 1 is moved from the battery 17.
4-4 Wiper switch (B) (relay COM → wiper motor Lo) → rotor 7 → Earth current flows and wiper motor A starts operating. - When the fiber motor A starts operating, the conductive plate 6 and the contact piece 5 of the stop position detection switch (A) are separated, and the power supply 17 is connected to the transistor 22. Resistance 23. resistance 2
Since voltage is applied through transistor 5, transistor 2
2 remains energized, and wiper motor A continues to operate. However, the oscillation length of the rectangular wave oscillation circuit (C1 is
Since the time is set shorter than the time required for wiping one blade, when the blade wipes one time, the conductive plate 6 and the contact piece 5 come into contact on the reduction gear 1, and the stop position is detected through the base contact auto 27 of the transistor 22 and the resistor 28. Since the switch (N) is connected to ground, the transistor 22 is de-energized, the transistor 21 is also de-energized, and the relay 13
The movable piece 14 is the No contact 13, the Ill N C contact 15
Return to ground → rotor 7 → wiper, I, CH (B
) (wiper motor Lo→relay COM) -7iT moving piece 14→NC contact 15-47-A closed circuit is formed,
Rotor 7 is suddenly braked and stopped. After that, when the next oscillation starts, its output pulls up the pace potential of the transistor 22, turns the transistor 22 on, and repeats the above process, wiping it once at regular intervals while the wiper switch (Bl) is placed in the intermittent position. It is what performs the operation.

As detailed above, the present invention provides a front mi glass cleaning device for automobiles that automatically stops the wiper motor A at a fixed position.
A stop position detection switch (made of Al) with a simple structure that simply detects ON and OFF, and the switch (Al)
Since the stop position is detected by the relay 13 and the transistor 21 is controlled, the current flowing through the stop position detection switch (Al, which is a semiconductor circuit, can be kept below 0.1A, so the structure This simplification has the effect of reducing costs, as well as eliminating most of the electrical sparks and greatly improving durability.

[Brief explanation of the drawing]

Figure 1 shows a conventional intermittent device for automobiles. A structural diagram of the device incorporated into the front glass cleaning device. FIG. 2 is an f1ζ construction diagram in which the intermittent device according to the present invention is incorporated into an automobile front glass cleaning device from the beginning. Explanation of symbols In Fig. 1, A: Wiper motor A': Fixed position automatic stop relay B Wiper switch C, intermittent device C, oscillator C'': Output section 11, I2: Current 1, reduction gears 2 and 3: Conductive plate 5, 6: Contact piece 7: Rotor 8: Intermittent device operation switch 9, 1o, 12 Nidoran sister 11: Resistor 13, relay 14, movable piece 15: NC contact 13: NO sliding contact 2 In the diagram A: Wiper motor prisoner・Stop position detection switch (B), wiper switch (C) ・Square wave oscillation circuit D = Relay part E, relay control circuit 1 Reduction gear 6. Conductive plate 5: Contact piece 7 Rotor 15 Relay 14, movable Child 15: NC contact 13: NO contact 17, bar, Terry 21, 22. Transistor 23, 24, 25, 26, 2B, Ro 0, 62: Resistor 27
・29, 31, 37: Diode 56, output terminal P of the oscillation circuit 68: Manual stop terminal Hiroshi Kono Co., Ltd. Representative of San7ha Electric Manufacturing Co., Ltd. Hiroshi Kono

Claims (1)

[Claims] The relay 13 of the relay section D is connected to the other end of the power supply 17 whose one end is grounded, and the other end of the relay 13 is connected to the output stage transistor 21 of the relay control circuit E that controls the relay 13. The interlocking movable piece 14 is connected to the other end of the wiper motor A whose one end is grounded via the wiper switch (B), the fixed contact 15 of the relay part D is directly grounded, and the other fixed contact is connected to the power supply 17. Furthermore, the power supply 17 is connected via the wiper switch (B) to the rectangular wave oscillation circuit (C) that creates an intermittent time and the control transistor 22 of the relay control circuit E, and the output terminal of the rectangular wave oscillation circuit (C) is connected. 36 is connected to the control transistor 22 of the relay control circuit E, and one end of a stop position detection switch (A) that is synchronized with the wiper motor A and detects the stop position is grounded, and the other end is connected to the control transistor 22 of the relay control circuit E. A front glass cleaning device for an automobile, characterized in that it is connected to a control transistor 22.