防跳线器：用于绕线时防止跳线，其中间瓷轮由超精抛光制成，配有高速轴承，使绕线时跳动在很小的范围内，保持了绕线时张力原稳定性。

wire jump preventer: applicable for wire jump preventing during winding. the niddle ceramic roller is made by precise polishing and matched with high-speed bearing so that jump during winding can be minimized to ensure the tension stability.