Scallop culturing by ear-hanging method demands drilling of hole in the ear groove on the left shell for which
an equipment for automatic in-line positioning and posturing of the scallop shell is required. The authors develope
such an equipment with revolving rollers, and discuss mechanical conditions for controling posture of scallop
shell. The results are summarized as follows.
The characteristic of the scallop shell's contour is that while most part of its contour is circular shape, it has
a straight line part at the ear. Under the action of the two revolving rollers, the vertically positioned scallops
start revolving between two holding plates and when the ear of scallop gets into the gap of the two rollers, it
stops rotating with the ear facing down and the ventral margin up. Thus, automatic posturing of the scallops is
made possible. When the gap S between two rollers is (0.54-0.77)L, the gap B between two holding plates is
(1.09 -1.15) W, the revolution number 71 of the rollers is from 84 to 212 rpm and the diameter of the roller is
less than 0.34L, the success rate of posturing of ears reaches 100 %. where L : length of shell, W :Width of
shell.
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