| 摘要 |
PROBLEM TO BE SOLVED: To provide a wheel train receiver abutting part structure where a flat part of a gear is not excavated. SOLUTION: A gear 12 is supported, for rotation, by inserting an axle 7 of the gear 2 into a mortice 3 provided at a wheel train receiver 1 and a mortice 13 provided at a bottom board 12. Related to the wheel train receiver 1, four pin-like abutting parts 4 are concentrically provided to the wheel train receive 1 with every 90 deg. with the center of the mortice 3 as a center. A tip end 5 on the gear side of the abutting part 4 is chamfered (11) so that no edge of the tip end 5 contacts the gear 2. A rounded surface may be accepted. The abutting part 4 of the wheel train receiver 1 supports a gear flat part 6 of the gear 2 while its height is adjusted for determining struggling of the gear 2.
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