JPH06227369A - Waterdrop eliminator - Google Patents

Abstract

PURPOSE:To remove waterdrops sticking to a machine tool and a car window without using any member liable to hinder the range of vision by installing a supply opening of air in each position of respective nodes to be produced at a time when an elastic plate is made into standing-wave vibrations with frequencies of integer times of a natural frequency of this fixed elastic plate. CONSTITUTION:An air hose is installed along the sidepiece of a transparent plate 1, and a supply owing 3 of air is installed in each position of respective nodes to be produced when this transparent palte 1 is made into standing-wave vibrations. In this case, such a fact that how many times of frequency energy in a natural frequency is inputted into an exciting means is determined in advance, and according to this presetting, the air supply opening 3 is installed. An instance in illustration shows a position of the air supply opening 3 at a time when the frequency energy of three times of the natural frequency is inputted into the exciting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water drop removing device for removing water drops such as cutting liquid or grinding liquid adhering to windows of machine tools such as cutting devices and grinding devices and water drops adhering to windows of vehicles.

[0002]

2. Description of the Related Art Conventionally, in order to remove water droplets adhering to windows of machine tools and vehicles, a wiper blade made mainly of rubber is provided at the tip of an arm, and the arm is driven by an electromagnetic motor to wipe the water droplets with the wiper blade. Had been removed by.

[0003]

In the conventional water drop removing device, the arm, the wiper blade, and the like are indispensable, and there is a problem that those members obstruct the view. The present invention has been made in view of the above problems of the conventional technique, and an object thereof is to use a machine tool or a machine tool without using a member such as an arm or a wiper blade that obstructs the field of view. An object of the present invention is to provide a water drop removing device that can remove water drops adhering to a window of a vehicle.

[0004]

In order to achieve the above object, the water drop removing device according to the present invention fixes both ends of a transparent plate such as glass or plastic with holding means and vibrates one or both of the holding means. Means is provided, and energy of a frequency that is an integral multiple of the natural frequency of the transparent plate whose both ends are fixed is input to the vibrating means, the transparent plate is caused to resonate, and standing wave vibration is caused. An air outlet is provided at each node of the wave vibration.

[0005]

All objects having mass and elasticity can vibrate, and when the elastic system is freely vibrating, the elastic system vibrates at one or more natural frequencies peculiar to the elastic system. When an elastic force is applied to the elastic system, the elastic system vibrates forcibly. When the frequency of the stimulating force matches the natural frequency of the elastic system, a state of resonance occurs and the elastic system produces a large amplitude. The elastic system can maintain a constant amplitude if the necessary energy is continuously applied to the system in forced oscillation by an external force.

The water drop removing apparatus according to the present invention is an application of the above-described principle. Both ends of a transparent plate, which is an elastic body, are fixed by holding means, and the transparent plate is in a fixed state at both ends, that is, a fixed beam at both ends. When the vibrating means is provided at one or both ends of the fixed beam at both ends, the energy of the frequency of the natural frequency of the fixed beam at both ends is input to the vibrating means, and when the fixed beam at both ends is forcibly vibrated, the transparent plate is As shown in (1), one antinode of vibration is generated, and the fundamental vibration occurs. When energy having a frequency twice as high as the natural frequency of the beam fixed at both ends is input to the vibrating means, the transparent plate has two antinodes of vibration as shown in FIG.

Considering now the double vibration state, the water droplets attached to the beam fixed at both ends get vibration energy and condense, and further jump out from the beam fixed at both ends, and the standing wave vibration is generated as shown in FIG. Try to gather at the position of each verse.

If air outlets are provided at the positions of the nodes of the both-end fixed beam that vibrates in the standing wave and the air is ejected, the collected water droplets can be blown out of the area of the both-end fixed beam.

[0009]

EXAMPLES Examples will be described with reference to the drawings. FIG. 4 shows an example in which a bimorph type piezoelectric actuator (2) is used as the vibrating means. The vibrating means may be provided only on one side of the transparent plate (1) or may be provided on both sides. Further, it goes without saying that a laminated piezoelectric actuator or an electromagnetic actuator such as a voice coil may be used as the vibrating means.

The air hose (4) is provided along the side surface of the transparent plate (1), and an air outlet (3) is provided at each node when the transparent plate (1) vibrates with standing waves. ing.
The energy of the frequency up to which the natural frequency is input to the vibrating means is determined in advance, and the air outlet (3) is provided accordingly. In the case of FIG. 4, the position of the air outlet (3) when the energy having the frequency three times the natural frequency is input to the vibrating means is shown.

[0011]

EFFECT OF THE INVENTION Water droplets adhering to the transparent plate obtain energy from the vibration system, condense, jump out from the transparent plate, and try to collect at the positions of the nodes of the transparent plate which are vibrating in the standing wave. Therefore, if the water drop removing device according to the present invention is applied to a window of a machine tool or a vehicle, it is possible to remove the water drop without using a member that obstructs the field of view such as an arm or a wiper blade. It is possible.

[Brief description of drawings]

FIG. 1 is a side view showing that a transparent plate is vibrating fundamentally.

FIG. 2 is a side view showing that the transparent plate vibrates twice.

FIG. 3 is a side view showing the operation of the water droplet removal device.

FIG. 4 is a side view showing an embodiment of a water drop removing device.

[Explanation of symbols]

 1 Transparent plate 2 Bimorph type piezoelectric actuator 3 Air outlet 4 Air hose 5 Belly 6 Section 7 Water drop 8 Spacer 9 Stopper 10 Screw

Claims (1)

[Claims] 1. A transparent elastic plate having both ends fixed, and at least one of the fixed ends of the elastic plate is provided with a vibrating means, which is elastic at a frequency that is an integral multiple of the natural frequency of the fixed elastic plate. A water droplet removing device characterized in that an air outlet is provided at each node position generated when a plate is vibrated by a standing wave.