| 摘要 |
An installation composed of a plurality of machines disposed adjacent a common work space delimited by a boundary surface, each machine being associated with a respective portion of the boundary surface and having a work-performing member movable into and out of the work space through the associated boundary surface portion, and an optical monitoring system composed of a plurality of optical monitoring assemblies each associated with a respective machine. Each assembly includes: a light barrier structure including a plurality of light sensors each disposed in a light beam path to form a light barrier coextensive with the boundary surface portion associated with the associated machine, and each light sensor producing an electrical signal indicative of reception of light; an electrical signal processing device connected to receive the electrical signals from all light sensors for producing an intrusion signal when any one of the light sensors is not receiving light; a warning device connected to the electrical signal processing device for emitting a light signal in response to production of an intrusion signal; a light receiving device optically linked with the warning device of every other assembly for producing a warning signal in response to emission of the signal by the warning device of any other assembly; and a control device connected between the light receiving device and the associated machine for causing the work-performing member of the associated machine to remain outside the work space when a warning signal is being produced by the light receiving device.
|
