SMALL HOLE ELECTRIC DISCHARGING MACHINE

The present invention relates to a fine electrode chucking apparatus, wherein an adapter (10) is connected to a spindle device (120) to supply working fluid and electricity to a fine electrode (110), an electrode seal (20) is inserted and fixed to an upper cylinder (41) of a shutter supporting member (40) by an adapter (10), the shutter supporting member (40) is composed of an upper cylinder (41) and a lower cylinder (42), the adapter (10) and the electrode seal (20) are inserted and fixed to the upper cylinder (41), and a shutter (50) inserted into the lower cylinder (42) presses and supports a plurality of chucking jaws (70) to chuck the fine electrode (110). The shutter (50) is inserted into the shutter supporting member (40) to press the chucking jaws (70) to chuck the fine electrode (110), a spring (60) provides the shutter (50) with an elastic force to maintain a chucking state in a descending position, upper and lower balls (81, 82) are inserted into upper and lower ball holes (43, 44) of the shutter supporting member (40) to press the chucking jaws (70) in a descending position of the shutter (50) so that the fine electrode (110) is chucked. Thus, distortion of the fine electrode is prevented and tightening and loosening can be performed in a one-touch scheme so that the tightening and loosening can be achieved without a separate tool and thus cost required for replacement of the fine electrode is reduced.