Reinforcing bar binding machine

A reinforcing bar binding machine is provided with: a main sleeve having a tip end on which a hook is pivotally mounted; a tip end shaft fitted in an inside of the main sleeve; a spiral screw groove formed on the tip end shaft; a fitting opening that penetrates from an outside to the inside of the main sleeve; a key fitted in the fitting opening and brought in mash engagement with the screw groove; a short sleeve provided on an outer periphery of the main sleeve and covering the key; and an engaging means formed on the short sleeve and controlling a rotation of the main sleeve.
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