| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a problem that it is difficult to insert a bobbin to a tooth because an opening width of an insertion part of the conventional bobbin is set to be narrower than a tooth width for slip-off prevention after insertion and the bobbin hits the tooth at the time of insertion.SOLUTION: In order to solve a problem that it is difficult to insert a bobbin to a tooth, a shape of the insertion opening of the bobbin is formed into a shape with inclination or an R-shape so that the shape becomes a guide at the time of insertion, the opening width is set to be wider than the tooth width to improve insertion property, or protrusions are provided on the inner surface of the bobbin so that the bobbin has portion with width narrower than the tooth width to easily achieve slip-off prevention with elasticity of the bobbin.</p> |
