Provided is a technique for stretching a laver draining board, which improves work efficiency by automating the stretching of the laver draining board to the draining board frame, and which uniformly stretches the laver draining board to the draining board frame without deflection. The engaging mechanism 90 is for engaging the end gargle 11 of the laver draining board 10 with the laver draining board engaging hook 24 in the draining board frame 20, and includes: An opening and expanding claw 91 inserted between the end gargle 11 of the laver draining board 10 and the adjacent thin gargle 12; a moving shaft 98 inclined at a predetermined angle to the draining board frame 20, And a control unit that can control Fig. 7
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