JPH047588U

JPH047588U -

Info

Publication number: JPH047588U
Application number: JP4791690U
Authority: JP
Priority date: 1990-05-08
Filing date: 1990-05-08
Publication date: 1992-01-23

Description

[Brief explanation of the drawing]

第１図は、この考案の一実施例を示す機構図お
よびブロツク図である。第２図は、天井クレーン
における位置検出の概要を示す斜視図である。第
３図は、第２図におけるガータ端部の詳細構成を
示す概念図である。第４図は、第３図の装置によ
る位置検出動作の一例を示すタイムチヤートであ
る。第５図は、従来における光電スイツチの構成
とその動作を示す波形図である。第６図は、従来
における他の光電スイツチの構成とその動作を示
す波形図である。第７図は、第１図における他の
光電スイツチの構成とその動作を示す波形図であ
る。１２……ガータ（検出対象）、３０……遮光板
、３２……光電スイツチ、３６……投光部、３６
′……投光面、３８……受光部、３８′……受光
面、４０……光路、４２……投光部側シヤツタ板
、４４……受光部側シヤツタ板。 FIG. 1 is a mechanical diagram and a block diagram showing an embodiment of this invention. FIG. 2 is a perspective view showing an overview of position detection in the overhead crane. FIG. 3 is a conceptual diagram showing the detailed structure of the garter end in FIG. 2. FIG. 4 is a time chart showing an example of the position detection operation by the device shown in FIG. FIG. 5 is a waveform diagram showing the configuration and operation of a conventional photoelectric switch. FIG. 6 is a waveform diagram showing the configuration and operation of another conventional photoelectric switch. FIG. 7 is a waveform diagram showing the configuration and operation of another photoelectric switch in FIG. 1. 12... Gutter (detection target), 30... Light shielding plate, 32... Photoelectric switch, 36... Light projecting section, 36
′... Light projecting surface, 38... Light receiving section, 38'... Light receiving surface, 40... Optical path, 42... Light projecting section side shutter plate, 44... Light receiving section side shutter plate.

Claims

[Scope of Claim for Utility Model Registration] A photoelectric switch in which a light emitting part having a substantially circular light emitting surface and a light receiving part having a substantially circular light receiving surface are arranged facing each other; a light shielding plate that moves relatively to block light from the optical path of the photoelectric switch; and a light projector that is disposed in front of the light projecting section and blocks light from approximately half of the light projecting surface in accordance with the direction of relative movement of the light shielding plate. a light receiving part side shutter plate; and a light receiving part side shutter plate disposed in front of the light receiving part to block light from approximately half of the light receiving surface in the same direction as the light projecting part side shutter plate, and from the photoelectric switch. A position detection device characterized in that the position of the detection target is detected based on the obtained light reception signal.