(57) [summary] [purpose] and by interposing a spacer between the fixed blade and the side plate, and as the fixed blade and the side plate is never in direct contact, it was so as to cut the spacer when removing the fixed blade In things, when re-used by the fixed blade upside down, you can process a spacer and as may or may not replaceable, just to be reused by simply upside down the fixed blade. [Configuration] on either side of the fixed blade 11 corresponding to the tapered surface of the side plate side end of the high and low two kinds spacer 12a, 12b High and low you projecting set to be the alternate.
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