| 摘要 |
PROBLEM TO BE SOLVED: To reduce bubbles in a tank. SOLUTION: This circulating type grinding water tank device for storing grinding fluid to be used for peripheral edge working of spectacle lenses in the tank is provided with a liquid injection means having an injection port arranged on the surface of grinding water stored in the tank and injecting liquid toward bubbles generated in the tank. The liquid injection means is provided with a pump to suck grinding water within the tank and a water introducing passage for guiding grinding water sucked by the pump to the injection port. As liquid to be injected, grinding water within the tank is used.
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