| 摘要 |
A fixing structure is provided for fixing an adjustment screw for use in adjustment of closing of a tone hole of a tube body of a woodwind instrument by a key system. The adjustment screw is fixed to a screw fixing member such as a communicating plate or a stopper having a tapped hole. A block that is made by synthetic resin material is formed in a prescribed shape having a prepared hole penetrating therethrough and is detachably attached to the screw fixing member. For example, the block is placed in an engagement channel of the stopper, then, the adjustment screw having an external thread is screwed into the prepared hole of the block to be tapped by force and is further rotated to engage with the tapped hole of the stopper. To prevent the block from being easily extracted from the engagement channel of the stopper, both of the block and engagement channel are formed in substantially a trapezoidal shape in cross section. To prevent the adjustment screw from being easily loosened, an appropriate amount of rotation resistance between the adjustment screw and the prepared hole of the block is defined by setting prescribed dimensions such that a hole diameter of the prepared hole is set in proportion to an outer diameter d of the adjustment screw within a range between 0.85d and 0.95d.
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