| 摘要 |
PURPOSE:To prevent a gear transmission mechanism from rattling during stopping of a final load gear, by meshing more than two output gears of a drive mechanism with the final load gear, respectively, to remove apparent backlashes in the gear transmission mechanism. CONSTITUTION:Since a first spur gear 8 and a second spur gear 9 are meshed with one load gear 2, the first spur gear 8 and the second spur gear 9 are rotated at the same rotational speed, and they are coupled with first and second motors 4, 5 through speed reduction gears having different gear ratios, respectively. Therefore, the first motor 4 and the second motor 5 are rotated at different rotational speeds, respectively. Accordingly, the rotational speed of the first motor 4 is higher than that of the first spur gear 8 when the latter is rotated under no lead condition while the rotational speed of the second motor 5 is higher than that of the second gear 9 when the latter is rotated under no load.
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