JPH0429579B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wiper device, and particularly relates to an improvement in a wiper device having a blade storage function, for example,
The present invention relates to wiper devices that are useful for use in wiper devices mounted on vehicles such as automobiles that are subject to wind pressure.

[Conventional technology]

A wiper device with a storage function includes a crank arm that is rotated forward and backward by a motor, a rod that converts the forward and reverse rotation of the crank arm into reciprocating motion to reciprocate a linkage connected to the wiper arm, and a crank arm and rod. The blade is equipped with an effective length changing device that changes the effective length of the rod, and a wiper intermittent operating device that rotates the motor in the reverse direction to change the effective length of the rod when the blade is retracted. Therefore, some wiper arms are configured so that the wiper arm is rotated further downward from the intermittent operation stop position and stored.

[Problem that the invention seeks to solve]

However, in such a wiper device, since the intermittent operation stop position of the crank arm and the stop position during storage are set in the same direction (angle), the following problem occurs.

(1) As shown by the solid line in Fig. 10, if the crank arm 5 and rod 7 are set to be in a straight line in the intermittent operation stop position, the crank arm and rod 7 will be aligned in the retracted position. is bent as shown by the broken line, resulting in the following problems.

In the retracted position, even if a downward force Fd is applied to the blade 11, the crank arm and rod will be in a straight line, so there will be no further rotation; however, if a lifting force Fu is applied to the blade, the motor will move it in the forward direction. There is a danger that a rotating force may be applied to the

(2) As shown by the broken line in Figure 11, if the crank arm 5 and rod 7 are set to be in a straight line in the retracted position, the arm and rod will be in a solid line in the intermittent operation stop position. As shown, the bending occurs, resulting in the following problems.

If a lifting force is applied to the blade at the intermittent operation stop position, especially during high-speed running, it is conceivable that a force will be applied to rotate the motor in the opposite direction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wiper device that can prevent a force for rotating the motor from acting on the motor both in the intermittent stop position and in the retracted position.

[Means for solving problems]

The wiper device according to the present invention includes a crank arm 5 that is rotated forwardly by a drive gear 12 driven by a motor 31 when the blade 11 is activated and during a wiping operation, and rotated reversely when the blade 11 is stopped being retracted;
A rod 7 is provided between the crank arm 5 and the rod 7 to convert the forward and reverse rotation of the crank arm 5 into reciprocating motion to reciprocate the linkage 8 connected to the wiper arm 10. An effective length changing device 6 that eccentrically changes the effective length of the rod 7 immediately after startup and immediately before stopping storage.
, a fixed position stop switch 28 for stopping the motor 31 at a fixed position, and a wiper intermittent actuation device, and the wiper blade 11 is configured to be retracted by changing the effective length of the rod 7. In the device, the fixed position stop switch 28 has a first contact 20
a first conductive plate 24 that moves relatively; a stop position piece 27; and a stop position piece 27.
A pair of non-conductive parts 26 formed on both sides of the
a second conductive plate 25 having a second contact point 21 that moves relatively; Contact 20 and second contact 21 and first conductive plate 24
and a clutch member 16 that moves the second conductive plate 25 relatively, the wiper device comprising: an opening angle A of the driving side engaging portion 13; an opening angle B of the driven side engaging portion 18; Opening angle E of both non-conductive parts 26, 26, Braking angle F of the second contact 21 on the stop position piece 27, Braking angle G of the second contact 21 on the second conductive plate 25, Intermittent operation The crank arm 5 when the crank arm 5 and the rod 7 are aligned in a straight line at the stop position, and the crank arm 5 when the crank arm 5 and the rod 7 are aligned in a straight line during the retraction operation. By configuring the opening angle θ to satisfy the following formula, the relationship between the crank arm 5 and the rod 7 is as follows:
It is characterized in that the blade 11 is configured to be in a straight line both in the intermittent operation stop position and in the retracted position.

A+B=E+F+G-θ [Operation] According to the above-described means, since the crank arm 5 and the rod 7 are in a straight line both when the wiper blade 11 is in the intermittent operation stop position and the retracted position, the motor 31 It is possible to prevent a force from acting on the rotating shaft 32 from the load side to rotate it.

〔Example〕

Figures 1a and b are schematic diagrams showing a wiper device with a storage function which is an embodiment of the present invention, Figure 2 is a vertical sectional view showing a wiper drive device used therein, and Figure 3 is a housing. Fig. 4 is a plan view taken along the - line in Fig. 2 showing the opened state, Fig. 5 is an enlarged vertical cross-sectional view of the Fig. FIG. 7 is a circuit diagram, FIGS. 8a, b, c and 9 are schematic diagrams for explaining the operation.

In this embodiment, the wiper device includes a wiper drive device WD, in which a housing 1 includes a main body 2 forming a gear box.
A closed chamber is formed by fitting the lid 3 over the opening. A crankshaft 4 is rotatably supported approximately at the center of the main body 2, and one end of a rod 7 is connected to the free end of the crank arm 5, which rotates integrally with the shaft 4, via a rod effective length changing device 6, which will be described later. The other end of the rod 7 is rotatably connected to the free end of the linkage 8. One end of the linkage 8 is fixed to a shaft 9 rotatably supported at a lower position in the window frame of the automobile, and a wiper arm 10 holding a wiper blade 11 at its free end is attached to the shaft 9 and rotates integrally with the linkage 8. It is supported to do so.

A drive gear 12 integrally molded from hard synthetic resin is fitted to the end of the crankshaft 4 in the interior of the housing 1 so as to rotate together. A drive-side engaging portion 13 is provided protruding from the portion. A support shaft 14 is fixedly protruded from the cover body 3 and is aligned with the crankshaft 4. A clutch member 16 is rotatably supported on the support shaft 14 via an insulator 15.

The clutch member 16 is made of a plate material such as brass having conductivity and appropriate elasticity, and is punched into a substantially drop-shaped planar shape as shown in FIG. The clutch member 16 has a window hole 17 punched in an appropriate shape on the outside of the shaft hole, and is bent so as to be slightly warped in the thickness direction.
By working together with its own elasticity, the contacts described later are pressed against the conductive plate with an appropriate biasing force.

A driven side engaging portion 18 is provided on one side of the clutch member 16.
is protruded by bending the tongue piece 19 left uncut in the window hole 17 at a substantially right angle, and the driven side engaging portion 18 engages with the driving side engaging portion 13 of the drive gear 12. It is composed of

The clutch member 16 has a pair of first contacts 20, 20 and a second contact 211, each of which is a wear-resistant chip made of a conductive material, protruding from the clutch member 16. Reference numeral 21 denotes both first contacts 2 so as to equalize the load on the support shaft 14 by the elastic force of the clutch member 16 itself.
0 and 20 are arranged symmetrically to each other on the opposite side to the second contact 21.

The lid body 3 includes an insulating substrate 23 formed of an insulating material such as synthetic resin into a substantially circular panel shape.
A screw 22 is arranged concentrically with the center line of the support shaft 14.
It is secured by suitable means such as screwing or the like. A first conductive plate 24 is provided on the insulating substrate 23.
and the second conductive plate 25 are arranged concentrically with respect to the center line of the support shaft 14 and fixed by suitable means such as implant molding.

The first conductive plate 24 disposed inside is formed into a circular ring shape, and the pair of first contacts 20 are constantly pressed into contact with the first conductive plate 24 by the elastic force of the clutch member 16, as described above. It's getting old. The second conductive plate 25 disposed on the outside is formed in a substantially C-shape, and the cutout portion substantially forms a non-conductive portion 26 . At the center of the non-conductive plate 26, a stop position piece 27 formed of a conductive plate material in a substantially fan shape is disposed. second conductive plate 25,
The second contact point 21 is constantly pressed into contact with the circular orbit drawn by the non-conductive portion 26 and the stop position piece 27 by the elastic force of the clutch member 16.

The first conductive plate 24, the second conductive plate 25, and the stop position piece 27 are connected as shown in FIG. 7 in an electric circuit consisting of a power source 29, a wiper switch 30, a motor 31, etc. This constitutes a fixed position stop switch 28 that opens and closes the electric circuit of the motor.

In addition, in Fig. 7, S ₁ is a relay switch connected to the motor 31, and S ₂ is a fixed position stop switch 2.
S3 is a relay switch connected to wiper switch 30, _S3 is a relay switch connected to wiper switch 30,
_L1 is a relay coil that controls relay switches _S1 and _S2 , _L2 is a relay coil that controls relay switch _S3 , and INT is a wiper intermittent operating device.

A motor 31 is connected to one side of the housing 1, and a rotating shaft 32 of the motor 31 passes through the main body 2 and is inserted into the housing 1 so as to be perpendicular to the axial direction of the crankshaft 4. A pair of worms 33 and 34 having twists in opposite directions are integrally formed on the outer periphery of the insertion portion of the rotating shaft 32, and are located at positions facing both the worms 33 and 34, respectively. A pair of support shafts 35 and 36 are respectively protruded in parallel to the crankshaft 4 at positions opposite to each other. Worm wheels 3 are attached to both support shafts 35 and 36.
7 and 38 are externally fitted and rotatably supported, and these worm wheels 37 and 38 are meshed with the respective worms 33 and 34, respectively. Both worm wheels 37, 38 have intermediate gears 39, 4.
0 are integrally connected to each other with their axes aligned, and both intermediate gears 39 and 40 are meshed with the drive gear 12.

The effective length changing device 6 interposed between the crank arm 5 and the rod 7 includes a first cam 41 and a second cam 42, and the first cam 41 has a projection engagement groove 41a on its upper surface. and the small diameter boss 41c,
A stopper engagement groove 41b is formed on the outer periphery of each of the stopper engagement grooves 41b. The second cam 42 has a protrusion 42a on its lower surface that engages with the protrusion engagement groove 41a of the first cam 41.
However, a stopper engaging groove 42b is formed on its outer periphery, and a pin hole 42c is formed on its upper surface.

The first and second cams 41 and 42 are connected to a connecting shaft protruding from the free end of the crank arm 5 in parallel with the crankshaft 4, with the protrusion fitting groove 41a and the protrusion 42a being overlapped to fit each other. 43, respectively, and is housed in a holder 45 which is placed over the crank arm 5 and fixed with a screw 44. A stopper 46 is housed in the holder 45 so as to be slidable in the radial direction of the cams 41 and 42, and the stopper 46 is pressed against the outer circumferences of both cams by a spring 47.

The upper part of the connecting shaft 43 passes through the holder 45 and projects upward, and an eccentric plate 48 is rotatably fitted to the projecting end. A pin hole 48a is bored in the eccentric plate 48, and a pin 49 is inserted into the pin hole 48a through the shaft hole of the holder 45. The upper and lower ends of the pin 49 are fitted into a pin hole 50b of an eccentric metal 50 and a pin hole 42c of the second cam 42, respectively, which will be described later.
are integrally connected.

An eccentric metal 50 is assembled onto the eccentric plate 48 by being rotatably fitted onto the connecting shaft 43, and a protrusion 50a is provided on the upper surface of the eccentric metal 50. A stop ring 51 is fitted to the upper end of the connecting shaft 43 protruding from the upper surface of the eccentric metal 50, thereby preventing the parts fitted to the connecting shaft 43 from coming off.

A retainer 52 is rotatably fitted and fitted onto the eccentric metal 50.
A rod 7 is fitted into the rod 2 so as to rotate together with the rod 7, and is held by a retainer ring 53. A protrusion 52a is provided on the inner periphery of the retainer 52, and the protrusion 52a corresponds to the protrusion 52a of the eccentric metal 50.
is engaged with a.

A friction spring 54 is interposed between the inner periphery of the retainer 52 and the outer periphery of the eccentric plate 48, and this spring 54 moves the retainer 52 and the eccentric metal 50 relative to each other only immediately after starting the blade and immediately before stopping storage. It is designed to allow rotation. A joint seal 55 is placed on the outside of the spring 54.

Next, the effect will be explained.

Wiping operation.

(1) Operation of rod effective length changing device.

During the wiping operation, as shown in Figure 1a, the effective length of the rod 7 is shorter than the actual length L of the rod (the length between the pivot points at both ends of the rod) by the eccentricity e of the eccentric metal 50. It is becoming a state.

That is, the eccentric metal 50 and the retainer 5
2, since the protrusions 50a and 52a are in contact with each other, they are rotated together with the rotation of the crank arm 5, and the rod 7 is reciprocated in response to the rotation of the arm 5. With this, the blade 11
performs the wiping operation within a predetermined range.

During the wiping operation, the groove 48 of the eccentric plate 48
b and the protrusion 54a of the friction spring 54
are engaged with each other, and one groove side surface of the groove 41a of the first cam 41 and the second cam 42 are engaged with each other.
The projections 42a of the first and second cams 4
The relative positions of the grooves 41b and 42b of grooves 1 and 42 are shifted, and the stopper 46
b, 42b and is in contact with the outer periphery of both cams 41, 42. For this reason, both cams 41 and 42
is not restrained by the stopper 46, and the eccentric metal 50, eccentric plate 48, and retainer 52 rotate together around the connecting shaft 43.

(2) Wiper drive operation.

Here, the case of intermittent wiper operation will be explained. This is because in this case, since the wiper blade 11 is continuously stopped at the intermittent operation stop position, it is considered that a force that tends to rotate the motor due to external force such as wind pressure is likely to act on the wiper blade 11.

When the wiper switch 30 is turned ON to the INT position, the wiper intermittent operating device INT is activated and the second
Since the coil L ₂ is energized, the third switch S ₃
is turned on to the ground side. On the other hand, since the first coil L ₁ is excited by the path of power supply 29 → first coil L ₁ → wiper switch 30, the first
Switch _S1 is turned on to the motor 31 side. For this reason, power supply 29 → first switch S ₁ → motor 31
The motor 31 begins to rotate in the forward direction through the following path: → wiper switch 30 → third switch S ₃ → ground.

The motor 31 rotates from both worms 33 and 34 on the rotating shaft 32 to both worm wheels 3.
7, 38 and intermediate gears 39, 40 to the drive gear 12. Then, since the crankshaft 4 to which the drive gear 12 is fixed rotates integrally, the crank arm 5 turns. As described above, this pivoting motion of the arm 5 is transmitted to the rod 7 via the rod effective length changing device 6 and converted into a reciprocating motion, causing the wiper arm 8 to cause the blade 11 to perform a wiping operation.

On the other hand, since the driving side engaging portion 13 of the driving gear 12 and the driven side engaging portion 18 of the clutch member 16 engage with each other, the clutch member 16 rotates together with the driving gear 12. For this reason, the first contact 20 and the second contact 2 provided integrally with the clutch member 16
1 rotates while slidingly contacting the first conductive plate 24 and the second conductive plate 25.

When the wiper has been wiped a predetermined number of times, the wiper intermittent stop device INT becomes non-conductive. As a result, the second coil L ₂ is demagnetized, so the third switch S ₃
is turned on to the fixed position stop switch 28 side.

At this time, the second contact 21 is connected to the second conductive plate 25.
Since it is ON, the first conductive plate 24 → first contact 20 → clutch member 16 → second contact 21 → second
Due to the path from the conductive plate 25 to the ground, the fixed position stop switch 28 is turned on to the ground side.
For this reason, power supply 29 → first switch S ₁ → motor 31 → wiper switch 30 → third switch S ₃ →
The motor 31 continues to rotate in the forward direction due to the path from the fixed position stop switch 28 to the ground.

As the motor 31 continues to rotate, the second contact 2
1 reaches the non-conductive part 26 of the second electrically conductive plate 25, the electrical connection between the second contact 21 and the second electrically conductive plate 25 is cut off, so that the motor 31 is no longer energized. When the second contact 21 is moved to the stop position piece 27 and comes into contact with it due to inertia in the rotation system of the motor 31, drive gear 12, etc., the second contact 21→stop position piece 27→first switch S ₁ → Motor 31 → Wiper switch 30 →
Third switch S ₃ → first conductive plate 24 → first contact 2
Since a closed circuit of 0→clutch member 16→second contact 21 is formed, the electromagnetic brake is applied and the motor 31 is suddenly stopped. Due to the state in which this closed circuit is formed, the wiper blade 11 is activated by the wiper intermittent operating device INT to the second coil L ₂
It remains stopped until it is energized.

In this way, when the motor 31 is suddenly stopped and maintained stopped, the wiper blade 11
Since the mutual relationship of each component is set so that the wiper blade 11 is at a fixed position at the lower corner of the window, the wiper blade 11 is always stopped at a fixed position during intermittent wiping operation.

Furthermore, in this embodiment, as shown in FIG. 1a, when the wiper blade 11 is stopped at this fixed position, the crank arm 5 and the rod 7 are arranged in a straight line. The mutual relationships of each component are set in .

Therefore, when the wiper blade 11 is intermittently stopped, even if a downward force Fd due to wind pressure due to high-speed running and a lifting force Fu is applied to the blade 11, the motor 31 has no force to rotate it. has no effect. In other words, there is a downward force Fd and a lifting force on the blade.
When Fu is applied, a tensile force or a pushing force acts on the rod 7, but the rod 7 and the crank arm 5
Since they are in a straight line, only a pulling force or a pushing force acts on the crank arm 5, and there is no force trying to rotate it. Therefore, no rotational force acts on the motor 31 that is interlocked with the crankshaft 4.

After the predetermined stop time has elapsed, the wiper intermittent operating device INT becomes conductive. As a result, the second coil
L ₂ is energized and the third switch S ₃ is on the ground side.
Since it is turned on, power supply 29 → first switch S ₁ →
The motor 31 is rotated in the normal direction again through the path of motor 31 → wiper switch 30 → third switch S ₃ → ground. Thereafter, the wiping operation of the wiper blade 11 is continued by repeating the above operation.

Storage operation.

(1) Operation of rod effective length changing device.

When retracted, the crank arm 5 begins to be rotated in the opposite direction from the rotational position in which the wiper blade 11 reaches the reversed position, as shown in phantom lines in FIG.

At this time, the eccentric metal 50, the eccentric plate 48, and the second cam 42 are attached to the retainer 52.
It is prevented from rotating by a friction spring 54. After starting reverse rotation, 90
When rotated, the first and second cams 41 and 42 rotate relative to each other, so that the grooves 41b and 42b are aligned, and the other groove side surface of the groove 41a of the first cam 41 and the protrusion 42a of the second cam 42 are aligned. confront.

When the crank arm 5 rotates 90 degrees, that is, 180 degrees after the start of reverse rotation, the first and second cams 41,
42 also rotates 90 degrees integrally, and both cams 41 and 42
A stopper 46 engages with the grooves 41b and 42b. When the crank arm 5 further advances, both cams 41 and 42 are prevented from rotating by the stopper 46, and the eccentric metal 50
Since the rotation of the eccentric plate 48 is prevented, the eccentric metal 50, the eccentric plate 48, and both cams 41 and 42 are connected to the retainer 52.
The protrusions 50a and 5 rotate relative to each other.
2a are separated from each other, the eccentric metal 50 starts eccentricity, and the friction spring 54 and the eccentric plate 48 also rotate relative to each other, and the protrusion 54a is removed from the groove 48b.

When the crank arm 5 rotates 360 degrees after starting reverse rotation, the crank arm 5 is automatically stopped by the operation of the wiper drive device, which will be described later.

At this time, the eccentric metal 50 completes eccentricity, and the eccentric plate 48 and spring 54 rotate 180 degrees relative to each other.

With the completion of eccentricity of the eccentric metal 50, the effective length of the rod 7 becomes longer than the actual length L of the rod 7 by the amount of eccentricity e, as shown in FIG. 1b, and becomes L+e. is displaced and stored via the linkage 8 and the wiper arm 10 to a storage position below the inversion position.

In this way, when the wiper switch is turned off, the crank arm 5 rotates for the first 180 degrees in the same way as a normal wiping operation, and the stopper 46 moves through the grooves 41b of the first and second cams 41 and 42. 42b, and during the latter half 180 degree reverse rotation period, the eccentric metal 50 becomes eccentric, thereby pushing the blade 11 down to the storage position.

(2) Wiper drive operation.

Operation to fixed position.

In the above-mentioned wiping operation, when the wiper switch 30 is turned off to end the wiping operation, the power supply to the first coil _L1 via the wiper switch 30 is cut off. However, if the wiper switch 30 is randomly turned OFF and the blade is located in the middle of the window, the second contact 21 is turned ON to the second conductive plate 25, and the blade is stopped at the fixed position. switch 28
is turned on to the ground side. Therefore, power supply 29 → first coil L ₁ → second switch S ₂ →
The first coil L ₂ continues to be energized by the path from the fixed position stop switch 28 to ground.

As a result, the first switch S ₁ switches the motor 31
Since the motor 31 is turned on to the side, the motor 31 continues to rotate forward through the path of power supply 29 → first switch S ₁ → motor 31 → wiper switch 30 → third switch S ₃ → fixed position stop switch 28 → ground. Therefore, the wiper blade 11 is moved to the intermittent operation stop position.

Actuation from a fixed position.

As the motor 31 rotates forward, the drive gear 1
2 causes the clutch member 16 to rotate in the forward direction, so that the second contact 21 is moved to the non-conductive part 26. As a result, the motor 31 becomes non-conductive, but the drive gear 12 is rotated forward due to inertia, so that the second contact 21 is placed at the stop position piece 27 at the braking angle F, as shown in FIG. 8a. Just go inside and turn it on.

As a result, current flows in the opposite direction to the above through the path of power supply 29 → fixed position stop switch 28 → third switch S ₃ → wiper switch 30 → motor 31 → first switch S ₁ .
Motor 31 begins to rotate in reverse.

At this time, the drive side engaging portion 1 of the drive gear 12
3 has its front side in the forward rotation direction (hereinafter referred to as the front surface) facing the rear side surface of the clutch member 16 in the forward rotation direction (hereinafter referred to as the rear surface).

The reverse rotation of the motor 31 is transmitted to the drive gear 12, and since the drive gear 12 rotates in the reverse direction, the drive side engagement portion 13 thereof revolves in a direction away from the driven side engagement portion 18 of the clutch member 16. Therefore, the clutch member 16 is left in that position, so that the second contact 21 remains turned on at the stop position piece 27, and the reverse rotation of the motor 31 is maintained.

When the drive gear 12 is rotated by 360-(A+B) degrees as the motor 31 continues to rotate in the reverse direction, the rear surface of the drive-side engaging portion 13 catches the remaining clutch, as shown in FIG. 8b. Part 1
This contacts the front surface of the driven side engaging portion 18 of No.6.

After this engagement, drive gear 12 moves clutch member 16 in the opposite direction. As a result of this movement, the second contact 21 of the clutch member 16 overcomes the non-conductive portion 26 and is pushed into the second conductive plate 25 by a braking angle G, as shown in FIG. 8c, and is turned on. . Due to this contact, earth → first switch S ₁ → motor 3
1 → Wiper switch 30 → 3rd switch S ₃ →
Since a closed circuit is formed from the fixed position stop switch 28 to ground, the electromagnetic brake is applied and the motor 31 is suddenly stopped.

In this way, when the drive gear 12 is reversely rotated about one revolution due to the reverse rotation and sudden stop operation of the motor 31, the wiper blade 11 is stored in the retracted position by the operation (1).

The mutual relationship of each component is set so that the wiper blade 11 comes to the retracted position when the drive gear 12 rotates in reverse for about one revolution and then stops. Moreover, in this embodiment, as shown in FIG. 1b, when the wiper blade 11 comes to this storage position,
The mutual relationship of each component is set so that the crank arm 5 and the rod 7 are in a straight line.

Next, the principle will be explained.

In Fig. 9, E ₁ , E ₂ , and E ₃ respectively indicate the center position of the eccentric metal in the rod effective length changing device, E ₁ is the position when the intermittent operation is stopped, and E ₂ is the position when the intermittent operation is stopped.
_E3 , which is a position corresponding to the extension of _E1 , is the position when the crank arm 5 has advanced by an angle θ.

When the wiper blade is stored in the retracted position, the eccentric metal of the rod effective length changing device is eccentric so that the effective length of the rod 7 is L+e.

Now, assuming that the center position is at _E2 when the blade is stored in the retracted position, the crank arm 5 and rod 7 will be in a bent state as shown by the broken line in FIG. This is because this position _E2 is an extension of the intermittent operation stop position _E1 , and as explained above, the crank arm 5 and rod 7 are set to be in a straight line at the intermittent operation stop position. It is from. This relationship is the same as in the conventional case shown in FIG.

Therefore, the center position _E3 is determined so that the crank arm 5 and the rod 7 are in a straight line as shown by the imaginary line in FIG.
As is clear from Fig. 9, this position _E3 moves the crank arm 5 to the intermittently stopped position.
It is produced by advancing E ₁ by an angle θ. This angle θ is a value specific to the device, which depends on the lengths of the crank arm 5, the rod 7, and the linkage 8, the eccentricity e of the rod effective length changing device 6, and the like.

In this embodiment, in order to advance the crank arm 5 by an angle θ, A, B, E, F, G and θ shown in FIG.
It will be set to satisfy (1).

A+B+θ=E+F+G...(1) Here, as mentioned above, θ is a value unique to the device, and E, F, and G are also the coasting angle E and braking angle F, G that are unique to the device, so (1 ), the opening angle A of the driving side engaging portion 13 and the driven side engaging portion 18 are as follows.
By selecting the opening angle B, it is possible to create a situation in which the crank arm 5 and the rod 7 are in a straight line even in the retracted position.

A+B=E+F+G-θ...(2) In this way, even when the wiper blade 11 is retracted, the crank arm 5 and rod 7
Since they are aligned in a straight line, no rotational force is applied to the motor 30 that is interlocked with the crankshaft 4, as explained above.

Activates during rise up.

(1) Operation of rod effective length changing device.

During rise-up, the crank arm 5 is rotated forward by the operation of the wiper drive device. Due to this forward rotation, the eccentricity of the eccentric metal 50 is returned to its original state during the first 180 degree rotation from the retracted state, contrary to the operation in (1) above, so that the wiper blade 11 rises from the retracted position to the intermittent operation stop position. be done. Subsequently, the blade 11 starts a normal wiping operation in the second half of the rotation of 180 degrees.

(2) Wiper drive operation.

When the wiper blade 11 is retracted, the second contact 21 is turned on to the second conductive plate 25.
For example, when the wiper switch 30 is turned on to LOW, the first coil L 1 is turned on through the path of power supply 29 → first coil L ₁ → wiper switch ₃₀ .
Therefore, the first switch _S1 is placed on the motor 31 side.
Turned on. Therefore, the motor 31 is rotated in the forward direction through the path: power supply 29 -> first switch S ₁ -> motor 31 -> wiper switch 30 -> ground.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the gist thereof.
It goes without saying that various changes are possible.

For example, the rod effective length changing device is not limited to being disposed at the free end of the crank arm, but may be disposed on the crankshaft side.

〔Effect of the invention〕

As explained above, according to the present invention, by configuring the relationship between the crank arm and the rod so that they are in a straight line both when they are at the intermittent operation stop position and when the blade is in the retracted position, Since it is possible to prevent rotational force from acting on the motor, it is possible to prevent accidental wiping errors while driving at high speeds, or erroneous operations that start wiping after descending once during intermittent operation. The amount of rise up can be obtained.

[Brief explanation of drawings]

Figures 1a and b are schematic diagrams showing a wiper device with a storage function which is an embodiment of the present invention, Figure 2 is a vertical sectional view showing a wiper drive device used therein, and Figure 3 is a housing. Fig. 4 is a plan view taken along the - line in Fig. 2 showing the opened state, Fig. 5 is an enlarged vertical cross-sectional view of the Fig. FIG. 7 is an exploded perspective view, FIG. 7 is a circuit diagram, and FIGS. 8a, b, c, and 9 are schematic diagrams for explaining the operation. FIGS. 10 and 11 are schematic diagrams showing conventional examples. DESCRIPTION OF SYMBOLS 1... Housing, 2... Main body, 3... Lid body, 4... Crankshaft, 5... Crank arm, 6... Rod effective length changing device, 7... Rod, 8... Linkage, 9... Shaft, 10... Wiper arm, 11...
Wiper blade, 12... Drive gear, 13... Drive side engaging portion, 14... Support shaft, 15... Insulator, 1
6... Clutch member, 18... Driven side engaging portion, 20...
First contact, 21... Second contact, 22... Screw, 23...
Insulating substrate, 24...first conductive plate, 25...second conductive plate, 26...non-conductive part, 27...stop position piece, 28
...Switch, 29...Power supply, 30...Wiper switch, 31...Motor, 32...Rotating shaft, 33, 34...
Worm, 35, 36... Support shaft, 37, 38... Worm wheel, 39, 40... Intermediate gear, 41... First cam, 42... Second cam, 43... Connection shaft, 45...
Holder, 46...stopper, 47...spring, 4
8... Eccentric plate, 49... Pin, 50... Eccentric metal, 51... Stop ring, 52... Retainer, 53... Retaining ring, 54... Friction spring, 55... Joint seal, S ₁ , S ₂ , S ₃
…Relay switch, L ₁ , L ₂ …Relay coil.

Claims (1)

[Claims] 1. A crank arm 5 that is rotated forward by a drive gear 12 driven by a motor 31 when the blade 11 is activated and during a wiping operation, and reversely rotated when the blade 11 is stopped being retracted; A rod 7 is provided between the crank arm 5 and the rod 7, which converts reverse rotation into reciprocating motion and reciprocates the linkage 8 connected to the wiper arm 10, and is installed between the crank arm 5 and the rod 7, and is used immediately after the blade 11 starts up and when it stops being stored. It is equipped with an effective length changing device 6 that changes the effective length of the rod 7 by eccentrically changing the effective length of the rod 7, a fixed position stop switch 28 that stops the motor 31 at a fixed position, and an intermittent wiper operating device. The wiper device is configured such that the wiper blade 11 is retracted by changing the position, and the fixed position stop switch 28 is connected to the first contact 20.
a first conductive plate 24 that moves relatively; a stop position piece 27; and a stop position piece 27.
A pair of non-conductive parts 26 formed on both sides of the
a second conductive plate 25 having a second contact point 21 that moves relatively; Contact 20 and second contact 21 and first conductive plate 24
and a clutch member 16 that moves the second conductive plate 25 relatively, the wiper device comprising: an opening angle A of the driving side engaging portion 13; an opening angle B of the driven side engaging portion 18; Opening angle E of both non-conductive parts 26, 26, Braking angle F of the second contact 21 on the stop position piece 27, Braking angle G of the second contact 21 on the second conductive plate 25, Intermittent operation The crank arm 5 when the crank arm 5 and the rod 7 are aligned in a straight line at the stop position, and the crank arm 5 when the crank arm 5 and the rod 7 are aligned in a straight line during the retraction operation. By configuring the opening angle θ to satisfy the following formula, the relationship between the crank arm 5 and the rod 7 is as follows:
A wiper device characterized in that the blade 11 is configured to be in a straight line both in the intermittent operation stop position and in the retracted position. A+B=E+F+G-θ