| 摘要 |
PROBLEM TO BE SOLVED: To prevent causing of cracks on a synthetic resin double-gear manufactured by integrally molding a gear of major diameter 46 and a gear of minor diameter 47. SOLUTION: The gear of major diameter 46 and the gear of minor diameter 47 are coaxially integrally molded out of a synthetic resin closely to one another. A cutout 50 extended to a bottom of the gear of minor diameter 47 is formed between a tooth 49 of the gear of minor diameter 47 and a disc part 46c of the gear of major diameter 46.
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