JPH0652280U - Drive mechanism of wiper device - Google Patents

Abstract

(57) [Summary] [Purpose] The rotary motion of the wiper drive motor is converted into reciprocating motion by the cam structure, and is transmitted to the wiper blade to reciprocate. With the rotation of the drive shaft 2 of the wiper drive motor 1, the cam 3 rotates in the direction of arrow A, the protrusion 4 engages with the protrusion 6 of the cam 7, and the cam 7 rotates in the direction of arrow B. When the engagement is released, the cam 7 rotates in the reverse direction, and this reverse rotation causes the projection 6 to rotate.
Hits the stopper 10 and stops. Since the cam 7 is fixed to the driven shaft 5, the driven shaft rotates as indicated by the arrow C according to the rotation of the cam 7, and the wiper arm 12 swings through the wiper arm holder 11 as indicated by the arrow D. 13 is reciprocally driven left and right as shown by arrow E, and the front glass surface of the television camera case is wiped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive mechanism for a wiper device, and relates to a drive mechanism for transmitting power of a drive motor to a wiper blade by a cam mechanism.

[0002]

[Prior art]

 When a television camera (hereinafter abbreviated as "camera") is installed outdoors and monitoring is performed by remote control, rain or snow adheres to the lens and blocks the field of view of the camera, rendering it useless. To prevent this, for example, as shown in FIG. 2, the camera is housed in a camera case 21 in which a transparent glass 22 is fitted on the front surface, a wiper blade 13 is provided on the front surface of the front glass 22, and the upper portion of the camera case 21, etc. The wiper drive motor built into the wiper unit 23 is driven by remote control etc. to reciprocate the arm 12 left and right as shown by the arrow D, and the front side of the wiper blade 13 attached to the tip of the arm 12 There is one in which the surface of the glass 22 is wiped to remove the rain or snow adhering to it to secure the view of the camera.

As for the structure inside the wiper unit 23, for example, as shown in FIG. 3, a rotary plate 31 is attached to a drive shaft 2 of a wiper drive motor 1 having a reduction drive mechanism, and an arm 33 is attached to the rotary plate 31. One end 32 of the arm 33 is rotatably supported, one end of the arm 35 is rotatably supported by the other end 34 of the arm 33, and the other end of the arm 35 is fixed to the driven shaft 5. The rotary plate 31 is rotated in the direction of the arrow by the drive of the wiper drive motor 1, and the end portion 34 of the arm 33 moves up and down as indicated by the arrow G in response to this rotation, and the vertical movement causes the end portion of the arm 35 to move. The adhered driven shaft 5 is swung as indicated by the arrow C, whereby the wiper arm 12 is swung through the wiper arm holder 11 provided at the tip of the driven shaft 5 as indicated by the arrow D, and the wiper blade 13 is moved by the arrow h. Reciprocate left and right like the above to wipe off rain and snow on the front glass 22 surface. It is intended.

[0004]

As described above, in the conventional drive mechanism of the wiper device, in order to convert the rotational movement of the wiper drive motor into the swing movement of the wiper blade, a link structure including a plurality of arms or the like is used. The number of parts is large and the structure is complicated. In view of the above-mentioned conventional problems, the present invention is capable of converting the rotational movement of the wiper drive motor into the forward / backward drive operation of the wiper blade with a simple structure that does not require a large number of parts such as the above-mentioned link structure. To provide.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems. A wiper drive motor, a first cam attached to the drive shaft of the wiper drive motor and having a first protrusion on the outer periphery, and a driven shaft attached to the outer periphery of the wiper drive motor. A second cam that has a second protrusion that meshes with the first protrusion and rotates in one direction; and a second cam that is locked by the second cam and that disengages from the mesh when the second cam rotates in the reverse rotation direction. A spring for urging the wiper device, an arm fixed at one end to the driven shaft and swinging the driven shaft at the other end to swing like a fan, and a wiper blade provided at the other end of the arm The drive mechanism was constructed.

[0006]

[Action]

 With the above construction, in the drive mechanism of the wiper device according to the present invention, the rotational movement of the wiper drive motor is transmitted to the driven shaft via the two cams, swings the driven shaft, and is driven by the driven shaft. The fixed wiper arm is swung in a fan shape, whereby the wiper blade connected to the tip of the wiper arm is reciprocated left and right to wipe away rainwater, snow, etc. adhering to the front glass of the camera case.

[0007]

【Example】

 Hereinafter, embodiments of a drive mechanism of a wiper device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of an essential part of an embodiment of a drive mechanism of a wiper device according to the present invention. In the figure, reference numeral 1 is a wiper drive motor, which has a built-in reduction mechanism and rotates the drive shaft 2 at an appropriate speed. A cam 3 is fixed to the drive shaft 2 and rotates in the direction of arrow A when the wiper drive motor 1 rotates. Reference numeral 4 is a protrusion, for example, a pair of protrusions are provided at symmetrical positions on the outer circumference of the cam 3. Reference numeral 5 denotes a driven shaft, which is mounted in the wiper unit 23. 6 is a protrusion, for example, a pair is provided at symmetrical positions on the outer periphery of the cam 7, and the cam 3 is engaged with the protrusion 4 by the rotation of the cam 3 in the direction of arrow A. By this engagement, the cam 7 is rotated in the direction of arrow B. To do. Reference numeral 8 denotes a spring, one end of which is locked by a pin 9 provided on the cam 7 and the other end of which is locked in the wiper unit 23, and the cam 7 is pulled in an opposite direction of arrow B with appropriate tension. A stopper 10 receives the protrusion 6 and stops the cam 7 at a predetermined position when the protrusion 4 and the protrusion 6 are disengaged and the tension of the spring 8 causes the cam 7 to rotate in the direction opposite to the arrow B. The reference numerals 1 to 10 are the parts built in the wiper unit 23.

The wiper arm holder 11 described above is provided at the tip of the driven shaft 5, and the wiper arm holder 11 swings with the swing of the arrow C of the driven shaft 5, and the swing causes the wiper arm holder 11 to move. The wiper arm 12 attached to 11 oscillates in a fan shape as shown by the arrow D, which causes the wiper blade 13 connected to the tip of the wiper arm 12 to reciprocate left and right as shown by the arrow E, and the front glass 22 of the camera case 21. Wipe off.

The rotation of the wiper drive motor 1 causes the cam 3 to rotate in the direction of arrow A, whereby the projection 6 of the cam 7 is engaged with the projection 4 of the cam 3, and the cam 7 moves in the direction of arrow B. Rotate. When the protrusion 6 and the protrusion 4 are disengaged when rotated to a required position, the tension of the spring 8 causes the cam 7 to rapidly rotate in the direction opposite to the arrow B, and the cam 7 causes the protrusion 6 to engage the stopper 10. Stop at the position you made. When the protrusions 4 are provided at two symmetrical positions on the outer circumference of the cam 3, the above operation is repeated twice while the drive shaft 2 of the wiper drive motor 1 makes one rotation. The driven shaft 5 is rotated by the above-mentioned movement of the cam 7 as shown by the arrow C, and the wiper arm 12 is swung as shown by the arrow D according to the rotation of the driven shaft 5, whereby the wiper blade 13 is moved by the arrow H. It is reciprocally driven like. The reciprocating motion of the wiper blade 13 slowly moves to the right in the drawing in response to the rotation of the cam 7 in the direction of the arrow B, and rapidly returns to the left in the drawing due to the disengagement of the protrusion 6 and the protrusion 4. To do.

Although the projections 4 of the cam 3 have been described above in the example of being provided at two locations, the number of projections 4 is the number of rotations of the drive shaft 2 of the wiper drive motor 1 per unit time and the wiper blade 13 It should be set appropriately in relation to the number of times of driving. Further, in the above description, the cam 6 is provided with the protrusions 6 at two places, but the protrusions 6 are only provided at one place, and the engagement of the cam 3 with the protrusion 4 and the stopper are performed by this protrusion. You may make it serve as the engagement with 10.

[0011]

[Effect of device]

 As described above, according to the drive mechanism of the wiper device of the present invention, the rotational movement of the wiper drive motor is converted into the reciprocating movement of the wiper blade through the two cams and is transmitted. Compared with the link structure, the structure is simpler, the cost can be reduced, and the assembly labor can be reduced. In addition, when moving the wiper blade forward, set a relatively gentle speed to wipe off rain and snow, and speed up the return speed after wiping off rain and snow to minimize obstruction of the camera's field of view. It has advantages.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an embodiment of a drive mechanism of a wiper device according to the present invention.

FIG. 2 is an overall view showing the concept of a drive mechanism of a wiper device including a camera case body.

FIG. 3 is an example of a drive mechanism of a conventional wiper device.

[Explanation of symbols]

 1 wiper drive motor 2 drive shaft 3 cam 4 protrusion 5 driven shaft 6 protrusion 7 cam 8 spring 9 spring fulcrum 10 stopper 11 wiper arm holder 12 wiper arm 13 wiper blade

Claims (2)

[Scope of utility model registration request] 1. A wiper drive motor, a first cam attached to a drive shaft of the wiper drive motor and having a first protrusion on its outer periphery, and a first cam attached to a driven shaft on the outer periphery of the wiper drive motor. A second cam having a second protrusion that meshes and rotating in one direction; and a second cam that is locked by the second cam and urges the second cam in the reverse rotation direction when the mesh is disengaged. With a spring,
A drive mechanism for a wiper device comprising an arm having one end fixed to the driven shaft and the other end swinging in a fan shape by swinging of the driven shaft, and a wiper blade provided at the other end of the arm. 2. The drive mechanism for the wiper device according to claim 1, further comprising a stopper that engages with the second protrusion to stop the reverse rotation of the second cam at a required position.