JPH04111134U - photoelectric switch - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a photoelectric switch that automatically cleans dust etc. adhering to a light emitting surface and a light receiving surface. [Structure] Brushes 12 and 13 are provided that automatically slide on the light projecting surface 8 and the light receiving surface 9.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is designed to reduce the amount of light emitted from the emitter and incident on the receiver either directly or by reflection. The present invention relates to a photoelectric switch that detects the presence or absence of a detected object.

0002

[Conventional technology]

Figures 2 and 3 show an example of a conventional photoelectric switch, with Figure 2 being a perspective view and Figure 3 being a schematic diagram. It is a schematic configuration diagram. As shown in Figures 2 and 3, the photoelectric switch has a light emitter 1, a light emitter A light projecting section 3 consisting of a lens 2 and a light receiving section 6 consisting of a light receiving element 4 and a light receiving lens 5 are connected to the prism. It is mounted on a lint board 10 and housed in a case 7. Light emitter 3 and receiver of case 7 An opening is provided in the front of the light section 6, and this opening is made of, for example, protective glass. Transparent protective covers 8 and 9 are provided, respectively. 11 is an electrical signal connector 12 is a movable shielding cover that blocks the light emitted from the light emitter when necessary. It is used to cover the photoelectric switch and stop its operation as a photoelectric switch.

0003 The light from the light projecting unit 3 is projected through the transparent protective cover 8, and the reflected light is transmitted through the transparent protective cover 8. The light enters the light receiving unit 6 through the protective cover 9 and is received, and depending on the amount of light, the presence or absence of the object to be detected can be determined. is detected.

0004 The photoelectric switch has a light emitting surface, a light receiving surface, and a transparent protective cover 8 in FIGS. 2 and 3. If dust adheres to and 9, the functionality of the photoelectric switch will deteriorate, and in some cases, it may become unusable. It may become unusable. However, photoelectric switches are contactless, have high precision, and have high speed response. Due to its excellent properties such as This is becoming more common. Under such adverse environments, conventional methods require manual removal of the light emitting and receiving surfaces. Therefore, cleaning was performed at predetermined intervals.

[0005]

[Problem that the idea aims to solve]

As mentioned above, the method of manually cleaning the light emitting and light receiving surfaces at predetermined intervals, Maintenance is troublesome and maintenance costs increase.

[0006] The purpose of this invention is to solve the above-mentioned problems and to provide a light source that automatically cleans the light emitting and receiving surfaces. Our goal is to provide electric switches.

[0007]

[Means to solve the problem]

In order to achieve the above-mentioned purpose, the photoelectric switch of the present invention has a light emitting part and a light emitting part. In a photoelectric switch equipped with a light receiving section that receives light emitted from a light projecting section, the front A brush is provided that automatically slides on the light emitting surface of the light emitting section and the light receiving surface of the light receiving section. so that

[0008]

[Effect]

A brush that automatically slides on the light emitting surface and light receiving surface is provided, so the light emitting surface and light receiving surface are The surface will be cleaned automatically.

[0009]

【Example】

An embodiment of the photoelectric switch of the present invention is shown in FIG. The conventional method shown in Figures 2 and 3 The difference from a photoelectric switch is that there is a rotating machine 12A on the outer wall of case 7, and a rotating machine of this rotating machine. A rotating rod 12C that is attached to a rotating shaft 12B and rotates on a vertical plane of this rotating shaft; An automatic brush mechanism 12 is installed, consisting of a brush 12D attached to a rotating rod. . This brush 12D is applied to the light projection surface, which is the surface of the transparent protective cover 8 in FIG. It slides as it rotates. This automatically cleans the light projection surface. in this case, Continuous cleaning may be performed by continuously operating the rotating machine, or for example, by It is also possible to clean the rotary machine at predetermined intervals by using a rotary machine at predetermined intervals. Ru. In addition, although the above mentioned cleaning of the light emitting surface, the light receiving surface, shown in Figure 1, was cleaned with a transparent protective cover. A similar process is performed for the bar 9 by means of the automatic brushing mechanism 13.

0010

[Effect of the idea]

According to the present invention, a brush that automatically slides on the light emitting surface and the light receiving surface of the photoelectric switch. By installing a filter, it is possible to automatically clean the light emitting surface and the light receiving surface. Of course, it eliminates the manual cleaning work that was previously done, but it also eliminates dust, etc. Photoelectric switches with excellent characteristics such as non-contact, high precision, and high-speed response can be used even in harsh environments with many The application range of the photoelectric switch is greatly expanded.

[Brief explanation of drawings]

[Fig. 1] A perspective view showing an embodiment of the photoelectric switch of the present invention.

[Fig. 2] A perspective view showing an example of a conventional photoelectric switch

[Figure 3] Schematic diagram of the conventional photoelectric switch shown in Figure 2

[Explanation of symbols]

8 Transparent protective cover (projection surface) 9 Transparent protective cover (light receiving surface) 12 Automatic brush mechanism 12D brush 13 Automatic brush mechanism 13D brush

Claims (1)

[Scope of utility model registration request] 1. A photoelectric switch comprising a light emitting section and a light receiving section that receives light emitted from the light emitting section, wherein a surface of the light emitting surface of the light emitting section and a light receiving surface of the light receiving section is provided. A photoelectric switch characterized by having a brush that automatically slides.