| 摘要 |
PROBLEM TO BE SOLVED: To provide a double-head grinder capable of keeping flatness and parallelism at a high level even if a material to be ground has a large diameter. SOLUTION: The double-head grinder 1 grinds a material to be ground by sandwiching it with a lower grinding wheel 11a and an upper grinding wheel 11b from both sides. In the grinder 1, a sun gear 12 is provided in the center on the upper surface side of the lower grinding wheel 11a, and a plurality of planet gears 13 are disposed to be contacted with this sun gear 12. The planet gears 13 are provided with pockets 14 for retaining the material to be ground. Retaining gears 16 are disposed on a peripheral frame 15 to be contacted with the planet gears 13. Since the planet gears 13 are disposed to be contacted with the retaining gears 16, the planet gears 13 even with the size protruding over the peripheral frame 15 or protruding to the outside of the peripheral frame 15 can be used. Therefore, the material with a large diameter can be set in the planet gears 13 to be ground. COPYRIGHT: (C)2008,JPO&INPIT
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