農業機械学会誌
Online ISSN : 1884-6025
Print ISSN : 0285-2543
ISSN-L : 0285-2543
田植機の回転型植付づめの形状
並河 清
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ジャーナル フリー

1974 年 35 巻 4 号 p. 353-359

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In order to increase the performance of rice transplanter with the tine wheel, the profile of the transplanting tine to cut the rice-seedling-band and to transplant was investigated.
(1) To generate the curve of the tine profile, the operation of the tine was analysed as follows. (a) Cutting of the rice-seedling-band, (b) moving the rice-seedling to the surface of soil after cutting, (c) moving into the prescribed position to transplant, (d) going away from the prescribed position. These operations must satisfy the following conditions respectively. (a) To cut the seedling-band smoothly, (b) not to part the seedling from tine by centrifugal force or gravity, (c) dX/dt<0 and dγ/dt>0 (cf, Fig. 1), (d) dX/dt≥0 and dγ/dt≥0
(2) As the result of investigating the profile of the tine to satisfy the above four conditions using TAMURA coordinate (cf. Fig. 3), involute curve is obtained as solution, and height of the tine (Th) is obtained by equation (21), where transplanting depth is d, diameter of the evolute is T0 and the length from center of the tine wheel to head of the tine is T0+d+h
(3) Friction and adhesion between metal sheet surface and root part of the seedling-band were measured. And critical foward velocity of the transplanter to keep the seedling on the tine was estimated. Let the distance from the center of tine wheel to the middle part of tine be 0.4m and the number of tine on the tinewheel be six, then estimated velocity 3.2m/sec.
(4) The profile of the tine on the usual rice transplanter of this type was found to be consisted of two circular arcs and satisfies the above mentioned conditions.

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