JPS6237795Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a number of times storage device, and in particular, a power transmission mechanism that rotates a rotation mechanism by the rotational force of a motor, and a power transmission mechanism that is driven via the power transmission mechanism and that rotates the rotation mechanism. The present invention relates to an improvement of a number storage device having a timer cam for storing the number of rotations of a mechanism and a number storage mechanism provided with a timer switch.

This type of number storage device rotates a motor by operating a switch, then continues the rotation of the motor even after the switch operation is released, and stores a rotation mechanism in advance using the rotational force of the motor. Used when rotating by a certain amount of time (number of rotations). In this case, the rotating mechanism may be one that rotates as it is, or one that is equipped with a crank mechanism and swings back and forth. Among these, there are wiper blades for wiping the surfaces of automobile headlamps and front and rear windows, for example, as those that swing back and forth.

1, 2, and 3 show an explanatory external view, a front view, and a plan view, respectively, of a conventional wiper blade device, in which a worm 2 is fixed to a motor shaft 1a of a motor 1, and a worm A worm wheel 3 is engaged with the worm wheel 2, and an output gear 5 is connected to the worm wheel 3 through an idler 4 coaxial with the worm wheel 3.
A link 6 is pivotally connected to a crankshaft 5a fixed to an output gear 5, and a wiper blade 24 shown in FIG. 1 is reciprocated via this link 6. Further, a timer drive intermittent gear 7 is fixed coaxially with the output gear 5, or the timer drive intermittent gear 7 is engaged with the output gear 5, and the timer cam 8 is intermittently rotated by the intermittent gear 7. By opening and closing a timer switch 9 provided on the cam 8, the rotation of the motor 1 is stopped after the timer cam 8 has rotated once, and at the same time, the wiper blade is automatically stopped after swinging back and forth a predetermined number of times. , it has a structure in which the stopped state continues until the next switch operation (not shown) is performed.

However, in such a conventional device, the power transmission shaft of the power transmission mechanism, that is, the fixed shaft 3a of the worm wheel 3, and the timer cam shaft 8a of the number storage mechanism are provided independently from each other, so the number of component parts is reduced. In addition to increasing the number of devices, they also have drawbacks such as requiring a larger mounting space and increasing the number of assembly steps.

The present invention aims to reduce the number of parts, the mounting space, and the assembly man-hour by configuring the power transmission shaft of the power transmission mechanism and the timer cam shaft of the number storage mechanism as a common shaft. , aims to eliminate the above-mentioned conventional drawbacks.

Hereinafter, embodiments of the present invention will be described in more detail based on the drawings.

4, 5, and 6 are a front view, a plan view, and an exploded perspective view including a motor housing, respectively, of a wiper device according to an embodiment of the present invention, in which a motor fixed in a motor housing 10 is shown. A worm 12 is fixed to the motor shaft 11a of No. 11, and a fixed shaft 13a is attached to the housing 10.
A worm wheel 13 pivotally supported by the worm 12 is engaged with the worm 12, and the worm wheel 13
The output gear 15, which is pivotally supported on the gear shaft 15b, is rotated at a reduced speed through the idler 14, which is coaxial with the output gear 15.
one end side is pivotally connected, the other end side of the link 16 and one end side of the rotating arm 21 are pivotally connected via a pin 22,
One end of the rotating arm 21 is fixed to a blade shaft 23, and one end of a wiper blade 24 is fixed to the blade shaft 23. Further, an intermittent gear 17 for driving a timer is provided coaxially with the output gear 15.
is fixed, a timer cam 18 pivotally supported on the fixed shaft 13a is intermittently rotated by the intermittent gear 17, and a timer switch 19 provided on the timer cam 18 is opened and closed as described later. In this way, in the illustrated device, the power transmission shaft of the power transmission mechanism, that is, the fixed shaft of the worm wheel 13, and the timer cam shaft of the number storage mechanism, that is, the fixed shaft of the timer cam 18, are connected to the common fixed shaft 13.
It consists of a. Further, the timer cam 18 and the timer switch 19 have a structure illustrated in the electric circuit diagram of FIG.
Two conductive plates 26 and 27 are fixed to the conductive plates 26 and 27, and the contact 29 of the timer switch 19 is
a, 29b, and 29c have a structure in which they come into contact and separate in response to the rotation of the timer cam 18. In addition, in FIG. 6, 31 is the wiper blade 24.
32 is a washer pump, and 33 is a power source (battery). Note that the motor housing 10 is
It is formed from a motor case 10a and a motor cover 10b, and the motor cover 10 of the motor case 10a is
A continuous endless protrusion 10c is formed on the contact surface with b, and when the motor cover 10b is attached, this thin protrusion 10c sinks into the elastic sealing material 20 to improve watertightness. This is desirable.

In the above configuration, in order to operate the wiper blade, first, the hand-operated switch 31 is activated.
Press. Then, COM-NO is connected and the motor 11 rotates, passing through the worm 12, worm wheel 13, idler 14, output gear 15, crankshaft 15a, link 16, rotation arm 21, and blade shaft 23 in order, and then the wiper blade. 24 is reciprocated. Shortly after the operation of this hand-operated switch 31 (for example, 0.5 to 1 second), the contact 29a
~29c leaves the conductive plate 27 and contacts 29a, 2
9b comes into contact with the next conductive plate 26, so even if the hand-operated switch 31 is released, the motor 11 continues to rotate and swings the wiper blade 24 back and forth, and at the same time, the washer pump 32 is also energized (not shown). The cleaning water is squirted out from the cleaning water tank. After continuing in this state, when the contactor 29b reaches the intermediate step portion 26a of the conductive plate 26, the rotation of the washer pump 32 is stopped and the jetting of cleaning water is stopped. After that, the motor 11 continues to rotate, and the contact 2
When 9a separates from the end of the conductive plate 26, the motor 11
The current supply to the contacts 29a to 29a is cut off due to inertia.
When 29c contacts the conductive plate 27, the brake is stopped.

In the number storage mechanism that stores the number of times the wiper blade 24 reciprocates, the number of times it is stored can be determined by a combination of the number of teeth of the timer driving intermittent gear 17 and the number of teeth of the timer cam 18. It is preferable to change the number of these teeth as necessary.

In addition, in the case of the above-described embodiment, since the timer switch 19 is of a sliding type, the contact portions between the contacts 29a to 29c and the conductive plates 26, 27 are constantly cleaned, so there is a risk of poor conduction. There is no. On the other hand, if the timer switch is of a pressure contact type that does not involve sliding, there is a risk of contact failure if the timer switch is not used for a long time. Therefore, by using the sliding type of timer switch 19 as in the above embodiment, good operation can be obtained.

In the above-mentioned embodiments, a wiper blade device for wiping the surfaces of an automobile headlamp and front and rear windows was explained as an example, but it is needless to say that the present invention is not limited to such a device. Depending on the structure of the rotating mechanism, there are some that do not have a crank mechanism consisting of a crankshaft 15a, a link 16, a rotating arm 21, etc. as shown in FIGS. 4 to 6.

As explained above, according to the present invention, in a number storage device having a power transmission mechanism and a number storage mechanism, the power transmission shaft of the power transmission mechanism and the timer cam shaft of the number storage mechanism are connected to a common shaft. Because of this configuration, it has very excellent effects such as reducing the number of parts, reducing the mounting space, and reducing the number of assembly steps.

[Brief explanation of the drawing]

1, 2, and 3 are explanatory external views, a front view, and a plan view, respectively, of a conventional wiper blade device, and FIGS. 4, 5, and 6 are wiper blades according to an embodiment of the present invention. FIG. 7 is a front view, a top view, an exploded perspective view including a motor housing, and an electrical circuit diagram of a wiper blade device according to an embodiment of the present invention. 11...Motor, 12...Worm, 13...
Worm wheel, 13a...Fixed shaft, 14...
Idler, 15... Output gear, 15b... Gear shaft, 17... Intermittent gear for timer drive, 18...
Timer cam, 19...Timer switch.

Claims (1)

[Scope of utility model registration request] A power transmission mechanism that rotates a rotation mechanism by the rotational force of a motor, and a timer cam and a timer switch that are driven via the power transmission mechanism and store the number of rotations of the rotation mechanism. 1. A frequency storage device having a frequency storage mechanism, characterized in that a power transmission shaft of the power transmission mechanism and a timer cam shaft of the frequency storage mechanism are configured as a common shaft.