| 摘要 |
PURPOSE:To manufacture a cylindrical multivane fan continuously, reasonably, inexpensively, and in bulk by fitting circular side plates to long-sized vane pieces in sequence while arranging the plates at intervals of a fan and providing cutting allowances, and cutting the cutting allowance parts one at a time. CONSTITUTION:Circular side plates 3 for holding vane pieces 1, having fitting grooves 2 of the vane pieces 1 in its peripheral side respectively, are fitted in sequence to the prescribed number of long-sized vane pieces 1, while arranging the plates 3 at intervals of a fan (a) and providing cutting allowances 4, to form a cylindrical body A. Next, the body A is rotated by inserting a fixing mandrel into a mandrel inserting hole 6 provided to the central part of the plate 3, and one or several sets of the fans (a) are cut off at the same time by circular, rotary cutting knives 5 to obtain the cylindrical multivane fan (a) continuously.
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