| 摘要 |
A movable sinker ( 8 ) can move a tip portion ( 8 c) forward and backward relative to a needle bed gap ( 2 ) through pivotal displacement by setting, as a support point, a concave portion ( 5 a) of a needle plate ( 5 ). A wire spring ( 10 ) energizes the movable sinker ( 8 ) so that the tip portion ( 8 c) is moved forward into the needle bed gap ( 2 ). A stopper ( 20 ) on which an abutment portion ( 8 e) of the tip portion ( 8 c) of the movable sinker ( 8 ) abuts to control the movable sinker ( 8 ) to be pivotally displaced by the energization of the wire spring ( 10 ) is provided in a position in the bottom portion of the base ( 4 ) near the needle bed gap ( 2 ). The maximum amount of press-in of the tip portion ( 8 c) of the movable sinker ( 8 ) is regulated by an abutment of the abutment portion ( 8 e) on the stopper ( 20 ). The stopper ( 20 ) can adjust a forward and backward movement amount relative to the needle bed gap ( 2 ) by a position adjusting mechanism ( 21 ).
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