| 摘要 |
An overhead traveling and transporting system includes a transporting carriage traveling along a track. The carriage has a gripping mechanism to grip an object, a hoisting mechanism to move down the gripping mechanism to a load port for the object, and a sensor emitting a light beam within a pseudo plane surface and receiving a reflection thereof. The system also has: a device for monitoring an obstacle existing in an emission direction of the emitted light beam, based on the reflected light; and a selecting device for establishing one condition that the obstacle existing forward in the traveling direction is monitored if the transporting carriage is traveling and establishing another condition that the obstacle existing downward from the transporting carriage is monitored if the gripping mechanism is moved down, by selecting the direction of emission and/or selecting an area of monitoring by the monitoring device.
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