Method of protecting eyes from welding rays in arc welding and apparatus therefor
AssigneesNagase Sangyo Kabushiki Kaisha, Kabushiki Kaisha Sensor Gijutsu Kenkyujo
InventorArio Koyama
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Abstract
A method of protecting eyes from welding rays in arc welding and an apparatus therefor are disclosed which are capable of closing a filter plate over a period from right before the generation of arc welding rays to the termination of the generation to fully intercept the rays, to thereby effectively protect the eyes of an operator from the rays. The invention is constructed in a manner such that a controller carries out the on-off control of a voltage applied from a filter power source to a PLZT filter plate depending upon a signal supplied from a detection circuit thereto when the detection circuit detects a built-up current occurring in a welding current, to thereby carry out the actuation of the filter plate.
Claims14
A method of protecting eyes against arc in welding which utilizes a personal eye-protector having a filter plate formed of a material capable of exhibiting an electro-optic effect and arranged thereon, comprising the steps of:
- detecting a magnetic field generated around a welding current cable to detect the occurrence of a transient built-up current in a welding current and generating a detection signal;
- and
- controlling a voltage applied to said filter plate depending upon said detection signal;
- occurrence of said magnetic field being detected by a magnetic field detector provided on an electrode holder;
- and
- said detection signal being converted into a light signal or wave signal of a predetermined frequency and being received by a receiver provided at a position of said eye-protector.
An eye-protecting apparatus for arc welding, comprising:
- a filter plate for an eye-protector, said filter plate being formed of a material which is capable of exhibiting an electro-optic effect;
- a power source for said filter plate which generates a voltage applied to said filter plate;
- a detection circuit for detecting a transient built-up current in a welding current;
- said detection circuit comprising a magnetic field detector, a transmitter for transmitting a plurality of signals different in frequency from each other depending upon signals supplied from said magnetic field detector thereto, a receiver for receiving the signals supplied from said transmitter, and a frequency discriminator for discriminating the frequencies of the signals received by said receiver;
- and
- a controller for controlling said voltage applied to said filter plate depending upon a signal supplied from said detection circuit.
An eye-protecting apparatus as defined in dlaim 7, wherein said filter plate is formed of a PLZT material.
Dependencies are inferred from the claim text.