| 摘要 |
PROBLEM TO BE SOLVED: To provide a bobbin of a corrugated board collar connectable with collar plates of both ends, and strengthening connecting strength so that a cylindrical shape is not deformed when a winding drum is the cylindrical shape. SOLUTION: This bobbin is composed of a combination of the cylindrical winding drum of rounding cardboard or corrugated board, and a pair of collar plates joined to both ends. A large number of connecting pieces are respectively projected long at equal intervals in the peripheral direction on both ends of the winding drum. A laterally projecting checking claw is formed on the tip of the connecting pieces. On the collar plates, a through hole of the connecting pieces is formed with an allowance width in a position where the winding drums thrust each other on the cylinder edge. A fixing cutout for reversely inserting the checking claw on the tip of the connecting pieces is bored nearer the center than the through hole. COPYRIGHT: (C)2005,JPO&NCIPI
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