JPS63232054A - Intermittent wiper device - Google Patents

Abstract

PURPOSE:To enable a capacitor to be instantaneously charged and to enhance the response characteristic of intermittent wiper action, by providing a normally closed contact, connected to a battery, in an intermittently driving circuit, formed by a series circuit of resistor and capacitor, so that the capacitor can be charged bypassing the resistor. resistor. CONSTITUTION:When a wiper is placed in a stop position with an intermittent wiper starting switch 14 in the side of a closing position 14a, a capacitor 13a in an intermittent operation circuit 13 is charged to a level of supply power voltage. A device, if the starting switch 14 is switched to the side of a normally open contact side, immediately conducts transistors Tr13f, 13e turning on a relay 12 and driving a wiper motor 10. And if the wiper is actuated closing a normally open contact of a fixed position stop switch 11, an electric charge of the capacitor 13a is discharged to a base of the transistor Tr13f. Next the device, closing a normally closed contact of the stop switch 11 if the wiper comes to a stop position, places the wiper in a stop period with no conduction in the transistor Tr13f, and during this time, the capacitor 13a comes to be again charged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an intermittent wiper device used in automobiles and the like.

2. Description of the Related Art A conventional intermittent wiper device was constructed as shown in FIG.

That is, in FIG. 1, 1 is a wiper motor, 2 is a fixed position stop switch whose normally open contact side is connected to the e side of the battery, and whose normally closed contact side is connected to the e side of the battery.

3 is the motor drive relay, 4 is the capacitor 4! L.

An intermittent wiper circuit section consisting of a resistor 4b, a transistor 4c, etc., 6 is an intermittent wiper start switch, 6 is a capacitor 6a, 6b, a transistor 6a, a resistor 6
d, etc., a washer interlocking circuit section, 7
is a washer motor, and 8 is a washer start switch. The time constant of the intermittent operation is determined by the resistor 4b and the capacitor 4&.

To explain the operation of this intermittent wiper device, when the wiper shown in FIG. 1 is in the stopped position and the intermittent wiper start switch is in the OFF state, both ends of the capacitor 4& are charged to the power supply voltage.

When the intermittent wiper start switch 6 is turned on, the transistor 40 is driven and the motor drive relay 3 is turned on.
/(Then, the wiper motor 1 is energized and begins to operate.

By operating this wiper operating motor, the fixed position stop switch 2 is switched.

The normally open contact closes, and at that instant, the potential at the input point becomes twice that of the battery, but the electric charge in the capacitor 4& is discharged to the base of the transistor 4c, and the potential at the five points drops to almost zero potential. Next, when the wiper comes to the stop position, the normally closed contact of the fixed position stop switch 2 closes, so the five points are at negative power supply potential, the transistor 4c becomes non-conducting, and the wiper enters the rest period. . Eventually, the resistor 4b and capacitor 4a are charged, and when the five points become positive potential, the transistor 4o is turned on again and the wiper operates.

Problems to be Solved by the Invention As mentioned above, the conventional intermittent wiper device is configured so that the first intermittent wiper start switch 6 can be turned on from the ON state to oyy.
If the switch is switched to the ON state immediately after switching to the ON state, the wiper may not operate until the capacitor 4a is charged because the capacitor 4a is not charged.

Means for Solving the Problems In order to solve this problem, the present invention has a structure in which the normally closed contact of the intermittent wiper start switch is connected to the battery, and this normally closed contact is connected to a capacitor.

Operation Since the configuration is as described above, the capacitor is charged instantaneously, so the intermittent wiper start switch can be turned from the ON state to the OFF state.
Immediately after switching to the FF state, the wiper can immediately operate even if it is switched to the ON state again.

Example An embodiment of the present invention will be described below with reference to FIG. 1 of the drawings.

First, the embodiment shown in FIG. 2 will be explained. 9 is a battery, 10 is a wiper motor, 11 is a fixed position stop switch, 12 is a motor drive relay, 13 is a capacitor 13a, and a variable resistor 13b.

Resistor 130, 13d, transistor 7 resistor 131B, 13
In the intermittent operation circuit section constituted by f, capacitor 1
31L is for the time constant of the intermittent time, and the transistor 1315
is a transistor for driving the motor drive relay 12, a transistor 13f is a transistor for driving the bias circuit of the transistor 1315, and a variable resistor 13
b is a bias resistance of the transistor 13f. Reference numeral 14 denotes an intermittent wiper starting switch, which is composed of a normally closed contact 14a connected to the battery 9 and a normally open contact. 16 is a program operating circuit section, and this program operating circuit section 1
6 is a delay time constant capacitor 15&, a delay time constant resistor 15b, a holding time constant capacitor 16C1, a holding time constant resistor 16d, a charging transistor 15e for charging the capacitor 160, a discharging resistor 16f, and a protective resistor 15g.
It is made up of.

Further, 16 is an OR circuit of the signals of the intermittent operation circuit section 13 and the program operation circuit section 16, and includes a resistor 16& and a diode 16b connected to the normally open contact of the intermittent wiper switch.
, 160. Resistor 16 (consisted by i. 17
is a washer motor, and 18 is a washer start switch.

To explain the operation of this configuration, when the wiper is in the stop position as shown in Figure 2, the intermittent wiper start switch 1
4 is in the closed position 141L@.

Both ends of the capacitor 131L are charged to the power supply voltage. If the intermittent wiper start switch 14 is switched to the normally open contact side, the transistor 13f is activated.

1315 immediately becomes conductive, the motor drive relay 12 turns on, and the wiper motor 10 operates. When the wiper motor 1o operates, the fixed position stop switch 11
The normally open contact of is closed, and at that moment the five points have a potential twice that of the battery 9, but the electric charge of the capacitor 131L is discharged into the base circuit of the transistor 13f, and the input point drops to almost zero potential. Next, when the wiper comes to the stop position, the normally closed contact of the fixed position stop switch 11 is closed, and the five points are at a negative power supply potential, so the transistor 13f is non-conductive and enters the wiper rest period. Eventually, the resistor 13b
When tL is charged and the five points become positive potential, the transistor 13f becomes conductive again and the wiper operates.

In this way, intermittent wiper operation is performed.

Further, when the washer start switch 18 is closed, the washer motor 17 is activated and the washer fluid can be sprayed onto the front window. and simultaneous delay time constant capacitor 16&
When the tail charging starts and reaches a certain potential, the charging transistor 156 becomes conductive, and charging of the holding time constant capacitor 150 starts. This holding time constant capacitor 160
When the charging potential exceeds a certain value, the transistor 13f is made conductive via the diode 160 of the OR circuit 16, the transistor 136 is also made conductive, the motor drive relay 12 is turned on, and the wiper motor 10 is operated. The operating time of this wiper motor 1o is the holding time constant capacitor 15
0 and the resistance 15 (![It is determined by the time constant determined accordingly.

Effects of the Invention As described above, in the intermittent wiper device of the present invention, since the bias resistance of the transistor 13f of the first intermittent operation circuit 13 is the variable resistor 13b, the intermittent time can be adjusted, and the intermittent wiper start switch can be normally closed. Connect contact 141L to battery 9
and this normally closed contact 141L and capacitor 1
Since 3 contacts are connected, the intermittent wiper start switch 14 is normally closed during the period when the wiper is operating.
When the capacitor 13a is turned off, the capacitor 13a is instantly charged and the potential at the 1st point returns to its initial state, so even if the intermittent wiper start switch 14 is immediately closed, the wiper motor 10 will continue to operate. Even if the wiper is repeatedly opened and closed quickly, the wiper will always operate when it is closed, so it has the advantage of being effective in driving the vehicle and ensuring safety, and is of great practical value.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing an embodiment of the intermittent wiper device of the present invention, and FIG. 2 is an electrical circuit diagram of a conventional intermittent wiper device. 9...Battery, IQ...Wiper motor, 11...Fixed position stop switch, 12...
...Motor drive relay, 13...Intermittent/operating circuit section, 13t...Capacitor, 13b, 1
30.13+1...Resistance. 13e1.13f...Transistor, 14...
...Intermittent wiper start switch, 14 &...
・Normally closed contact. 16...Program operating circuit section, 16&...
... Capacitor for delay time constant, 16b... Resistor for delay time constant, 150... Capacitor for holding time constant, 16d... Resistor for holding time constant, 16e...
...Charging transistor, 16f...Discharging resistor, 16g...Protection resistor, 16...
OR circuit, 16 &... Resistor, 16b. 180...Diode, 16d...Resistor, 17...Washer motor, 18...
...Forasha, start switch. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
figure

Claims (1)

[Claims] A wiper motor, a relay that drives the wiper motor, a transistor that drives the relay, an intermittent drive circuit that intermittently drives the transistor and includes at least a series circuit of a resistor and a capacitor, and the resistor of the intermittent drive circuit. a normally closed contact connected to the battery so that the capacitor can be charged without going through the battery, a normally open contact connected to drive this intermittent drive circuit, and when this normally open contact is closed, the normally closed contact An intermittent wiper device consisting of an intermittent wiper start switch that opens.