Model sxb 430 book sewing machine adopts stepless change device , central lubricating system , parallel control spring for sewing frame and has safety guards on all moving parts 該機采用無級調(diào)速裝置,集中潤滑系統(tǒng)和訂書架的平衡控制,運動部位均設(shè)有安全防護罩,故機器運裝平穩(wěn),噪音低。