| 摘要 |
A sealing mechanism is disposed in a lower-arm insertion portion of a working tank of a wire-cut electric discharge machine, and a pre-sealing unit is attached to the sealing mechanism. The pre-sealing unit includes bellows unit and partition unit which surrounds the sealing mechanism from within the working tank. Further, a supply pipe formed with a plurality of openings directed to the sealing mechanism is located at the upper part of the bellows unit, and a working fluid is introduced into the pre-sealing unit through the openings of the supply pipe.
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