| 摘要 |
PROBLEM TO BE SOLVED: To reduce the irregular rotation of a rotary drum by integrally molding a driven side large gear and a driving side small gear so that their pitch error coarse/dense positions are matched with offset positions. SOLUTION: The center 1-0 of a driving side gear 1, the center 3-0 of a driven side gear 3 and the center 2-0 of a two-stage gear 2 are located at predetermined positions set by design, the angle A indicating the positional relation between the driving side gear 1 and the driven side gear 3 is a predetermined value, and the angle B may be set to B=(A-180 deg.). This resin-molded gear is molded by a die, it is known that the pitch errors and coarse/dense direction of the gears molded by the die on certain conditions are nearly fixed, and the pitch errors and coarse/dense direction of a driven side large gear and a driving side small gear 2-2 are nearly fixed. The driven side large gear and the driving side small gear 202 may be integrally molded so that the angle of the position where their pitch errors become coarse or dense is made B.
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