JPH0322049Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wiper drive device that is effective for use in wipers for wiping vehicle window glass, etc.
This invention relates to a wiper drive device with a rise-up function.

[Conventional technology]

As a conventional device of this kind, for example,
There is a window wiper drive device described in Japanese Patent No.-10969.

That is, this device includes an electromagnet and a cam that is moved up and down by the electromagnet on the same axis as the eccentric shaft on which the drive gear is integrally molded.The cam separates the clutch plate from between the drive plate and the eccentric shaft, and the drive The crankshaft, which is rotated by the drive gear via the plate, is stopped at a fixed position, and then the rod that drives the wiper arm is moved by the eccentric amount by the rotation of the eccentric shaft, causing the wiper arm to move to retract. The wiper arm is configured to be stopped by turning off the power using a height down switch.

[The problem that the idea attempts to solve]

In such a conventional wiper drive device,
A height down switch that turns off the power to the motor when the retraction movement is stopped is interposed in the motor drive circuit, and this switch is configured to be opened and closed by being moved in the radial direction by a clutch plate. There are the following problems.

(1) Since the amount of movement by the clutch plate when opening the height down switch is small, chattering is likely to occur.

(2) In order to avoid chattering, etc., strict machining and assembly precision is required for related parts such as the movable contacts of the switch, the clutch plate, and the cam that controls this plate.

The purpose of the present invention is to solve the above-mentioned problems, have a simple structure, reduce processing and assembly accuracy, and
Moreover, it is an object of the present invention to provide a wiper drive device that can realize accurate retracting movement and stopping thereof.

[Means to solve the problem]

The wiper drive device according to the present invention includes an eccentric shaft 2 rotatably supported by a main body 1, and an eccentric shaft 2 rotatably fitted to the eccentric shaft 2 by an eccentric amount E, and connected to a wiper arm 8. a crankshaft 3; a drive gear 10 that projects from the eccentric shaft 2 so as to rotate integrally therewith and meshes with a worm shaft 9 driven by a motor M; and a wiper arm 8 around the drive gear 10 of the main body 1. A stopper 19 is disposed at a position opposite to the lower reversed position, and an engaging portion 12 of the drive gear 10 is attached to the crankshaft 2 so as to rotate integrally with the engine and move in the radial direction. A clutch plate 13 is provided with a first engaging portion 14 that engages with the stopper 19 of the main body 1, and a second engaging portion 15 that engages with the stopper 19 of the main body 1;
is in the direction in which it engages with the engagement portion 12 of the drive gear 10,
And the stopper 1 of the main body 1 of the second engaging portion 15
A spring 20 is always biased in the direction in which the engagement with the electromagnetic coil 21 is released. Plunger 2 reciprocated by demagnetization
2, and a third member fixed to the plunger 22 so as to move integrally therewith, and provided on the clutch plate 13.
By engaging the engaging portion 16, the clutch plate 13 resists the biasing force of the spring 20, and the engagement of the first engaging portion 14 with the engaging portion 12 of the drive gear 10 is released. cam 24 in which a deformed portion 24a is formed to move the second engaging portion 15 in the direction in which the second engaging portion 15 engages with the stopper 19 of the main body 1;
a drive plate 18 fixedly attached to the crankshaft 3 so as to rotate and move together therewith, and configured to rotate together with the clutch plate 13; the main body 1, the drive gear 10, and the drive plate. 18, a storage position detection switch 26 which is always ON and turns OFF when the eccentric position of the crankshaft 3 relative to the stopper 19 is detected; and an electric circuit for the motor M and the electromagnetic coil 21. , a relay switch 39 connected to control starting/stopping of the motor M and excitation/demagnetization of the electromagnetic coil 21; a relay coil 40 controlling ON/OFF of the relay switch 39; and an electric circuit of the motor M. After the connected wiper switch 36 is switched from ON to OFF, the relay switch 39 is activated via the relay coil 40 while the storage position detection switch 26 is ON.
Keep this storage position detection switch 2 in the ON state.
The wiper switch 36 is provided with a holding circuit 43 that turns off the relay switch 39 via the relay coil 40 when the wiper switch 36 is turned off. Due to the ON state of the relay switch 39, the motor M continues to rotate, and
The cam 24 is moved via the electromagnetic coil 21 and the plunger 22, and as the motor M continues to rotate, the cam 24 moves the clutch plate 13 in the radial direction, thereby disengaging the crankshaft 3 from the drive gear 10. , the clutch plate 13 is the stopper 19
Then, due to the relative eccentric movement of the crankshaft 3 due to the continued rotation of the eccentric shaft 2, the wiper arm 8 is retracted and operated, and at the same time, the wiper arm 8 is moved to the retracted position due to the eccentric movement of the crankshaft 3. When the detection switch 26 is turned OFF and the switch 39 is turned OFF, the rotation of the motor M is stopped, and the rotation of the cam 24 is stopped via the plunger 22.
It is characterized in that it is configured to be operated to return.

[Effect]

According to the above-mentioned means, the stowage operation is performed by the following action.

The wiper switch 36 is activated to stop the wiping operation.
When turned off, the relay switch 39 is turned on via the relay coil 40, so the motor M continues to rotate.

On the other hand, when the relay switch 39 is turned on, the cam 24 is moved by the electromagnetic coil 21 via the plunger 22. Then, as the drive gear 10 rotates, the clutch plate 13
6 is moved in the radial direction by following the outer periphery of the deformed portion 24a of the cam 24. As a result, the engagement between the first engagement portion 14 and the engagement portion 12 of the drive gear 10 is released, and the second engagement portion 15 is disengaged from the stopper 1.
9, the clutch plate 13
Since rotation can be stopped, the crankshaft 3 will stop rotating at that position.

After the crankshaft 3 stops rotating,
When the drive gear 10 is rotated by a predetermined angle by the motor M, the crankshaft 3 is slid (eccentrically) relative to the eccentricity E.
This movement of the crankshaft 3 causes the wiper arm 8 to be retracted and operated.

When the crankshaft 3 is slid, the drive plate 18 fixed to the crankshaft 3 is moved relative to the drive gear 10, so the storage position detection switch 26 is turned off. As a result, the relay switch 39 is turned OFF, the motor M is stopped, and the cam 24 is returned to its original state by the electromagnetic coil 21.

〔Example〕

FIG. 1 is a longitudinal cross-sectional view showing a wiper drive device with a rise-up (storage or stowage) function, which is an embodiment of the present invention, and FIG.
3 is a partially omitted plan sectional view taken along line 1, and FIG. 4 is a partially omitted bottom sectional view taken along line - in FIG.
b, c, d are each plan view and side view of the main parts,
FIG. 5 is a circuit diagram, FIGS. 6 and 7 are explanatory diagrams for explaining the operation, and FIG. 8 is a time chart.

In this embodiment, the wiper drive device includes a main body 1, and an eccentric shaft 2 is rotatably supported on a bearing portion 1a of the main body 1. A crankshaft 3 is rotatably fitted onto the eccentric shaft 2 so as to be eccentric from the center by an eccentric amount E, and a pin 5 is provided protruding from the free end of the crank 4 of the crankshaft 3. One end of a rod 6 is rotatably connected to the pin 5, and the other end of the rod 6 is rotatably connected to the end of the wiper arm 8, which has a fulcrum in the center, opposite to the blade, via a pin 7. combined.

A drive gear 10 molded from synthetic resin is fixedly fitted onto the upper part of the eccentric shaft 2, and this gear 10 is meshed with a worm shaft 9 driven by a motor M. A circular annular portion 11 is integrally protruded around the upper surface of the drive gear 10, and a clutch plate 13 is provided on a part of the inner periphery of the circular annular portion 11.
A recessed portion 12 is cut out to serve as an engaging portion.

A clutch plate 13 is slidably disposed on the circular annular portion 11, and this plate 13 is attached to the crankshaft 3 through an elongated hole 13a so that it can rotate integrally and move in the radial direction. There is. The clutch plate 13 has a claw portion 14 as a first engaging portion that engages with the recess 12.
, a rotation stopper 15 as a second engaging part that engages with a stopper 19 fixed to the main body 1 to stop the rotation of the plate 13, and a rotation stopper 15 that is slid in the long groove 17 of the drive plate 18 fixed to the crankshaft 3. An engaging portion 16 as a third engaging portion that is movably fitted and engages with a cam to be described later is provided, respectively. One end of a pair of tension springs 20 is locked to the clutch plate 13.
The other end is secured under tension to a drive plate 18 fixed to the crankshaft 3. Therefore, the clutch plate 13 is always pulled toward the center of the crankshaft 3, and during normal wiping operation, the long hole 13 of the clutch plate 13
The right wall of a is pressed against the crankshaft 3. Note that FIGS. 1, 2, and 3 show the clutch plate 13 stopped at the retracted position, and the claw portion 14 of the clutch plate 13 is pressed against the circumferential surface of the circular annular portion 11 of the drive gear 10. There is.

An electromagnetic coil 21 is provided on the upper surface of the main body 1, and a plunger 22 is supported at the center of the electromagnetic coil 21 so as to be movable up and down on the axial extension line of the eccentric shaft 2 and prevented from rotating. . An armature 23 is fixed to the upper end of the plunger 22 and a cam 24 is fixed to the lower end, and the armature 23 is always urged upward by a leaf spring 25. When the electromagnetic coil 21 is energized, it attracts the armature 23 and the plunger 22 and the cam 24
is lowered against the leaf spring 25.

A storage position detection switch 26 is installed between the drive gear 10 and the drive plate 18, and the switch 26 includes a conductive plate 27, a first contact 29, and a second contact 30. The conductive plate 27 is formed in a substantially circular ring shape, and is concentrically arranged and fixed to the upper surface of the drive gear 10. A notch 28 is formed in a part of the inner peripheral edge of the conductive plate 27 as a non-conductive part for detecting the storage position.
is fixed so as to have a phase difference of approximately 180 degrees from the recess 12. The first contact 29 is arranged on the side where the crankshaft 3 is located in the retracted state and is connected to the main body 1.
The conductive plate 27 is fixedly attached to the conductive plate 27, and as the drive gear 10 rotates, the conductive plate 27 rotates relative to the conductive plate 27 while sliding on a track around the outside thereof. The second contact 30 is attached to the drive plate 18 in its long groove 1.
The drive plate 7 is fixedly attached at a position opposite to the drive plate 18 so that it can rotate together with the drive plate 18, and is electrically grounded through the drive plate 18, the eccentric shaft 2, and the main body 1. When the gear 18 rotates with respect to the drive gear 10, it rotates relative to the drive gear 10 while sliding on a track including the notch 28 of the conductive plate 27.

An auto-stop switch 31 is installed between the lower surface of the drive gear 10 and the main body 1.
The switch 31 includes a second conductive plate 32, an auto-stop position piece 33, a third contact 34, and a fourth contact 35. The second conductive plate 32 is formed in a substantially C-shape, and is disposed so that its notch is located on the opposite side to the side where the crankshaft 3 is located in the retracted state, and is concentrically attached to the lower surface of the drive gear 10. It is fixed. The auto-stop position piece 33 is formed in a substantially fan shape, and is fixed to the lower surface of the drive gear 10 at a notch in the second conductive plate 32. The third contact 34 and the fourth contact 35 are fixedly attached to the main body 1 in a line in the radial direction of the drive gear 10 at positions corresponding to the stoppers 19 fixed to the main body 1. The inner and outer tracks of the second conductive plate 32 including the auto-stop position piece 33 rotate relative to each other while sliding in and out of orbit as the drive gear 10 rotates.

The contacts 29, 30, 34, 35, the first and second conductive plates 27, 32, and the auto-stop position piece 33 are electrically connected as shown in FIG.

As shown in FIG. 5, the wiper drive device in this embodiment includes a wiper switch 36, a motor unit 37, and a control unit 38, which are constructed in a composite structure. Control unit 38
, a first relay switch 39 that controls starting and stopping of the motor M, a first relay coil 40 that controls opening and closing of this relay switch 39, and a second relay switch 41 that controls excitation and demagnetization of the eccentric electromagnetic coil 21. , a second relay coil 42 for controlling the opening and closing of this relay switch 41, a holding circuit 43 for maintaining excitation of the first and second relay coils 40 and 42, and an intermittent operation circuit for realizing intermittent operation. 44, and an initial drive circuit 45 for realizing the normal range of wiping from the first wiping starting from the retracted state, and these are configured to realize the operations described below.

In FIG. 5, 46 is the ignition switch, and B is the positive side of the battery.

Next, the effect will be explained.

(1) Wiping operation When the wiper switch 36 is turned on to Low, the motor M is energized through the path of battery B → wiper motor M → normally closed contact NC of the first relay switch 39 → terminal T8 of the wiper switch 36 → ground, and the motor M rotates. be done.

In addition, when the wiper switch 36 is turned on to Hi, the battery B → the Hi terminal of the wiper motor M →
The motor M is energized through the path from the terminal T5 of the wiper switch 36 to the ground, and the motor M is rotated at high speed.

In a normal wiping operation state, the eccentric shaft 2 is rotated via the worm shaft 9 and the drive gear 10 by the motor M rotated by the energization.
This rotation is transmitted to the clutch plate 13 via the claw portion 14 that engages with the recess 12 in the circular annular portion 11 of the drive gear 10, and is further transmitted to the clutch plate 13 through the long groove that engages with the engagement portion 16 of this plate 13. 17 and the like to the drive plate 18. As a result, the crankshaft 3 to which the drive plate 18 is fixed is rotated integrally with the eccentric shaft 2. Therefore, if the distance between the center of the crankshaft 3 and the crank pin 5 is C, the crank pin 5 will turn with a radius R of (C-E), as shown in FIG. A wiper arm 8 connected to this pin 5 via a rod 6 is subjected to a wiping movement at a wiping angle α.

(2) Storage (storage) operation In the above-mentioned wiping operation, when the wiper switch 36 is turned off to stop the wiping operation, battery B → terminal T3 of the wiper switch 36 → first relay coil 40 → transistor Trl → storage position detection switch 26→ground, the first relay coil 40 is excited. Due to this excitation, the first relay switch 3 is switched to the normally open contact NO side, so the motor M will continue to rotate.

Also, when the wiper switch 36 is turned off,
Battery B → Wiper switch 36 terminal T3 →
The second relay coil 42 is also excited by being energized through the path of second relay coil 42 → transistor Tr2 → ground. As a result, the second relay switch 41 is turned on, so battery B → terminal T1 of wiper switch 36 → second relay switch 41 → eccentric electromagnetic coil 21 → normally open contact NO of first relay switch 39 → ground. The eccentric electromagnetic coil 21 is excited by the path.

When the eccentric electromagnetic coil 21 is excited, the cam 24 is lowered via the armature 23 and the plunger 22, as shown in phantom lines in FIG. As the drive gear 10 rotates, the engaging portion 16 of the clutch plate 13 slides in the direction of arrow X along the outer periphery of the protrusion 24a as a deformed portion of the cam 24. The stop portion 15 and the claw portion 14 are moved in the direction of the arrow X. As a result, the engagement between the claw portion 14 and the recess 12 in the circular annular portion 11 of the drive gear 10 is released. At approximately the same time as this release, the rotating locking portion 15 engages with the stopper 19, and due to this engagement,
Rotation of the clutch plate 13 is stopped. Therefore, the crankshaft 3 stops rotating at that position.

At this time, the positional relationship among the eccentric shaft 2, crankshaft 3, crank pin 5, rod 6, and wiper arm 8 is as shown by the solid line in FIG.

Then, a first
Notch 28 for detecting storage position in conductive plate 27
and the second contact 30 fixed to the drive plate 18 are stopped at positions having a phase difference of approximately 180 degrees from each other, and therefore the first contact 29 and the second contact 30 are connected to the first conductive plate. 27 to maintain the storage position detection switch 26 in a closed state (see FIG. 4d).

Even when the crankshaft 3 is stopped, the first relay switch 39 continues to be turned on, so the motor M continues to rotate and the drive gear 10 continues to be rotationally driven.

When the drive gear 10 is rotated approximately 180 degrees by the motor M from the position where the crankshaft 3 has stopped its rotational movement (during this period, the crankshaft 3 will slide by twice the amount of eccentricity E). , the notch 28 for detecting the storage position in the first conductive plate 27 fixed to the upper surface of the drive gear 10 is
As shown in FIGS. 1, 2, and 3, the second contact 30 is moved to and comes into contact with the second contact 30 fixed to the stopped drive plate 18. Due to this contact, the second contact 30 becomes non-conductive to the first conductive plate 27, so the storage position detection switch 26 between the second contact 30 and the first contact 29
It will be turned off.

When the storage position detection switch 26 is turned off, the base current of the transistor Tr1 stops flowing, so the transistor Tr1 is turned off. This results in
The first relay coil 40 is demagnetized, and the first relay switch 39 is switched to the normally closed contact NC side. When the first relay switch 39 is switched, the energizing path is cut off, so the motor M stops rotating.

On the other hand, if the eccentric shaft 2 fitted to the drive gear 10 rotates approximately 180 degrees without the crankshaft 3 rotating together, the crankshaft 3 rotates the eccentric shaft 2 by 180 degrees, as shown in FIG. The wiper arm 8 is moved in a direction away from the pivot point by twice the amount of eccentricity. Due to this movement of the crankshaft 3, the wiper arm 8 is retracted by an angle β. When the wiper arm 8 has rotated by a predetermined storage angle β, the motor M is stopped by the above-described operation, so that the wiper arm 8 is accurately stored and stopped at a predetermined position.

In addition, the first relay switch 39 is a normally closed contact NC.
When the electromagnetic coil 21 is switched to the side, the path to the electromagnetic coil 21 is also cut off and demagnetized, so that the cam 24 is returned upward by the pushing force of the leaf spring 25. Then, each component of the wiper drive device is in the state shown in FIGS. 1, 2, and 3.

(3) Operation at the start of wiping Wiper switch 36 is in the intermittent operation position
The operation at the start of wiping when inserted into INT will be explained.

When the wiper switch 36 is turned on, the fourth contact 35 is grounded via the second conductive plate 32, so the initial drive circuit 45 and the intermittent operation circuit 44
A voltage is applied to it and it starts oscillating. This oscillation causes the transistor in the intermittent operation circuit 44 to
When Tr3 is turned on, the first relay coil 40 is energized and excited, and the relay switch 39 is turned on. As a result, the motor M begins to rotate, and the drive gear 10 is rotated via the worm shaft 9.

However, when the wiper switch 36 is placed in the intermittent operation position INT, the terminal T1 of the wiper switch 36, which is interposed in the energization path to the eccentric electromagnetic coil 21, is always OFF.
The electromagnetic coil 21 remains demagnetized.

As mentioned above, in the storage stop state, the first
As shown in FIGS. 2 and 3,
Recess 12 of drive gear 10 and clutch plate 13
Since the engagement with the claw portion 14 is released, only the drive gear 10 rotates as the motor M rotates. When the eccentric shaft 2 rotates approximately 180 degrees without the crankshaft 3 co-rotating, the crankshaft 3 is returned to the direction approaching the rotational fulcrum of the wiper arm 8 by twice the amount of eccentricity E. This movement causes the wiper arm 8 to rise up by an angle β. That is, the positional relationship among the eccentric shaft 2, crankshaft 3, crank pin 5, rod 6, and wiper arm 8 is as shown by the solid line in FIG. When the drive gear 10 has rotated approximately 180 degrees, the claw portion 1 is rotated by the action of the tension spring 20.
4 is engaged with the recess 12, and the rotation stopper 15 is removed from the stopper 19. This allows the clutch plate 13 to rotate freely, so the drive gear 1
With the zero rotation, the crankshaft 3 becomes in a state of integral rotation, and becomes in a state of performing a normal wiping operation.

Further, when the drive gear 10 rotates approximately 180 degrees, the third and fourth contacts 34 and 35 contact the auto-stop position piece 33 and become a positive potential, so that the initial drive circuit that was in a discharge state on the path W1 Capacitor C1 at 45 starts charging on path W2. However, since the transistor Tr4 remains OFF, the state of rotating the motor M is maintained and the motor M continues to rotate.

The drive gear 10 continues to be rotated by the motor M,
When the third and fourth contacts 34 and 35 come into contact with the second conductive plate 32 and have a negative potential (see FIG. 3), the capacitor C1 gradually begins to discharge along the path W3. This causes transistors Tr4, Tr5, and Tr6 to
To turn on, transistor Tr3 turns off.
However, ignition switch 46→motor M
The motor M continues to rotate because it is energized through the following path: → normally closed contact NC of the relay switch 39 → INT contact of the wiper switch 36 → auto stop switch 31 → ground.

Then, when the drive gear 10 continues to be rotated by the motor M and the third and fourth contacts 34 and 35 contact the auto-stop position piece 33, the motor M → the normally closed contact NC of the relay switch 39 → the INT contact of the wiper switch 36 → Auto stop switch 31
→A closed circuit is formed in motor M, so
Motor M is suddenly stopped. In this state, a positional relationship as shown in FIG. 6 will be created.

At this time, the capacitor C1 is in a charging state on the path W2, and the transistor Tr4 is in an OFF state, so
The protection current of the capacitor C2 in the intermittent operation circuit 44 passes through the path W4 to the transistor Tr5,
This transistor Tr5 is turned on.
As a result, transistor Tr3 is turned off,
The energization to the first relay coil 40 is stopped, and the first
The relay switch 39 is kept in the OFF state.
Therefore, the motor M is stopped while the discharge current of the capacitor C2 is flowing.

Then, when capacitor C2 finishes discharging, transistor Tr5 turns off and transistor Tr3 turns off.
Turn on. As a result, the relay coil 40 is energized, so the relay switch 39 is turned on. Therefore, the motor M is rotated by the path of battery B→motor M→normally open contact ON of relay switch 39→earth.

When the drive gear 10 is rotated by the motor M and the third and fourth contacts 34 and 35 contact the second conductive plate 32 and have a negative potential, the capacitor C1 is connected to the path W3.
Discharge begins at , transistor Tr4 turns on,
And since transistors Tr5 and Tr6 are turned on,
Transistor Tr3 will be turned off. As a result, energization to the relay coil 40 is stopped,
Relay switch 39 will be turned OFF.

However, battery B → motor M → normally closed contact NC of relay switch 39 → wiper switch 36
Since the INT contact → auto stop switch 31 → ground is energized, the motor M continues to rotate.

Then, when the drive gear 10 continues to be rotated by the motor M and the third and fourth contacts 34 and 35 contact the auto-stop position piece 33, the motor M → the normally closed contact NC of the relay switch 39 → the INT contact of the wiper switch 36 → Auto stop switch 31
→A closed circuit is formed in motor M, so
Motor M is suddenly stopped.

Thereafter, the above operation is repeated in accordance with the discharge time of the capacitor C2, so that the wiping operation is performed intermittently within the range of the wiping angle α shown in FIG.

In addition, FIG. 8 shows a time chart for the above-mentioned operation, where a is the INT contact of the wiper switch 36, b is the relay switch 39,
C indicates the terminal T1 of the wiper switch 36, and d indicates the ON and OFF states of the auto-stop switch 31, respectively.

In FIG. 8, the ON duration t1 when the relay switch starts operating is longer. this is,
This corresponds to the length of rotation of the drive gear 10 by 1.5 degrees (540 degrees). As a result, the wiper arm performs a rise-up operation from the retracted stop position, and subsequently performs the first wiping operation. That is, the seventh
In the figure, the wiper arm 8 performs a rise-up operation through an angle β, then reciprocates through a wiping angle α, and then stops at the position shown by the solid line in FIG. 6 (in the case of intermittent operation).

Also, the ON duration t2 at the end of the relay switch operation is shown as being long. This is because the drive gear rotates an extra 180 degrees to perform the stowing operation.

According to this embodiment, the eccentric shaft necessary for the retracting operation -
As the drive gear and drive plate rotate relative to each other to generate eccentric movement between the crankshafts, a contact point fixed to the drive plate connects a notch for detecting the storage position in the conductive plate fixed to the drive gear. Since the configuration is such that the motor is stopped by detecting that
The wiper arm can be accurately stored in a predetermined position.

Since the motor is stopped in the retracted position by a storage position detection switch interposed between the drive gear and the drive plate, it is directly connected to the motor drive electric circuit and can be opened/closed by a clutch plate, etc. This eliminates the need for a height-down switch, which makes it possible to reduce tolerance restrictions on processing accuracy and assembly accuracy for parts such as clutch plates and cams, thereby improving productivity.

Since the motor is configured to stop due to the relative rotation between the drive gear and the drive plate to generate eccentric movement between the eccentric shaft and the crankshaft, the retracting operation must be performed immediately after the wiper switch is turned off without any extra wiping operation. This can prevent the driver from feeling bothered by the extra wiping operation after the switch is turned off, or from feeling like he or she has made a mistake in the operation.

Since the second contact attached to the drive plate is grounded via the drive plate, etc., the structure of the energizing circuit in the storage position detection switch is simplified.

Since the relay switch and relay coil interposed in the motor drive electric circuit are also used for realizing intermittent operation, this is advantageous in terms of the number of parts, etc.

Further, since an initial drive circuit is provided, after the rise-up operation is performed, the first wiping operation can be performed successively.

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

For example, the second contact of the storage position detection switch is not limited to being electrically grounded to the drive plate 18; it may also be electrically insulated from the drive plate, and a dedicated energizing circuit may be attached between it and the main body. It may be configured to do so.

Further, the second contact is not limited to being attached to the drive plate, but may be attached to a member that rotates together with the crankshaft, such as a clutch plate or a dedicated attachment member.

The conductive plate and the contact in the storage position detection switch may be installed in place of each other between the drive gear and the member that rotates with respect to the crankshaft.

A relay switch and a relay coil whose opening and closing are controlled by the storage position detection switch may be provided exclusively in the motor drive electric circuit.

The initial drive circuit and the intermittent operation circuit can be omitted as appropriate.

[Effect of idea]

As described above, according to the present invention, a wiper drive device can be obtained which can realize accurate retracting operation, has a simple structure, and can reduce machining and assembly accuracy.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a wiper drive device with a rise-up (storage or stowage) function, which is an embodiment of the present invention, and FIG.
3 is a partially omitted plan sectional view taken along line 1, and FIG. 4 is a partially omitted bottom sectional view taken along line - in FIG.
b, c, d are each plan view and side view of the main parts,
FIG. 5 is a circuit diagram, FIGS. 6 and 7 are explanatory diagrams for explaining the operation, and FIGS. 8a, b, c, and d are time charts. 1... Body, 2... Eccentric shaft, 3... Crankshaft, 4... Crank, 5... Crank pin,
6... Rod, 8... Wiper arm, 9... Worm shaft, 10... Drive gear, 11... Circular annular portion, 12... Recessed portion (engaging portion), 13... Clutch plate, 14... Claw portion ( first engaging portion), 15...
Detent portion, (second engaging portion), 16... engaging portion (third engaging portion), 17... long groove, 18... drive plate, 19... stopper, 20... tension spring,
21... Eccentric electromagnetic coil, 22... Plunger, 23... Armature, 24... Cam, 24
a... Protrusion (deformed part), 25... Leaf spring, 26
... Storage position detection switch, 27 ... First conductive plate, 28 ... Storage position detection notch (non-conductive part),
29...first contact, 30...second contact, 31...
Auto stop switch, 32... second conductive plate,
33...Auto stop position piece, 34...Third
Contact, 35... Fourth contact, 36... Wiper switch, 37... Motor unit, 38... Control unit, 39... First relay switch, 40... First relay coil, 41... Second relay switch,
42...Second relay coil, 43...Holding circuit,
44... Intermittent operation circuit, 45... Initial drive circuit,
46...Ignition switch.

Claims (1)

[Claims for Utility Model Registration] Eccentric shaft 2 rotatably supported by main body 1
The crankshaft 3 is eccentrically fitted to the eccentric shaft 2 by an eccentric amount E and is rotatably fitted, and is connected to the wiper arm 8. a drive gear 10 meshed with a worm shaft 9 driven by a worm shaft 9; a stopper 19 disposed around the drive gear 10 of the main body 1 at a position corresponding to the lower reversed position of the wiper arm 8; It is attached to rotate integrally and move in the radial direction, and engages with the first engaging portion 14 that engages the engaging portion 12 of the drive gear 10 and the stopper 19 of the main body 1. a clutch plate 13 provided with a second engaging portion 15; and a first engaging portion 14 of the clutch plate 13
is in the direction in which it engages with the engagement portion 12 of the drive gear 10,
And the stopper 1 of the main body 1 of the second engaging portion 15
A spring 20 is always biased in the direction in which the engagement with the electromagnetic coil 21 is released. Plunger 2 reciprocated by demagnetization
2, and a third member fixed to the plunger 22 so as to move integrally therewith, and provided on the clutch plate 13.
By engaging the engaging portion 16, the clutch plate 13 resists the biasing force of the spring 20, and the engagement of the first engaging portion 14 with the engaging portion 12 of the drive gear 10 is released. cam 24 in which a deformed portion 24a is formed to move the second engaging portion 15 in the direction in which the second engaging portion 15 engages with the stopper 19 of the main body 1;
a drive plate 18 fixedly attached to the crankshaft 3 so as to rotate and move together therewith, and configured to rotate together with the clutch plate 13; the main body 1, the drive gear 10, and the drive plate. 18, a storage position detection switch 26 which is always ON and turns OFF when the eccentric position of the crankshaft 3 relative to the stopper 19 is detected; and an electric circuit for the motor M and the electromagnetic coil 21. , a relay switch 39 connected to control starting/stopping of the motor M and excitation/demagnetization of the electromagnetic coil 21; a relay coil 40 controlling ON/OFF of the relay switch 39; and an electric circuit of the motor M. After the connected wiper switch 36 is switched from ON to OFF, the relay switch 39 is activated via the relay coil 40 while the storage position detection switch 26 is ON.
Keep this storage position detection switch 2 in the ON state.
The wiper switch 36 is provided with a holding circuit 43 that turns off the relay switch 39 via the relay coil 40 when the wiper switch 36 is turned off. Due to the ON state of the relay switch 39, the motor M continues to rotate, and
The cam 24 is moved via the electromagnetic coil 21 and the plunger 22, and as the motor M continues to rotate, the cam 24 moves the clutch plate 13 in the radial direction, thereby disengaging the crankshaft 3 from the drive gear 10. , the clutch plate 13 is the stopper 19
Then, due to the relative eccentric movement of the crankshaft 3 due to the continued rotation of the eccentric shaft 2, the wiper arm 8 is retracted and operated, and at the same time, the wiper arm 8 is moved to the retracted position due to the eccentric movement of the crankshaft 3. When the detection switch 26 is turned OFF and the switch 39 is turned OFF, the rotation of the motor M is stopped, and the rotation of the cam 24 is stopped via the plunger 22.
A wiper drive device characterized in that the wiper drive device is configured such that the return operation is performed.