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(jī)采用無(wú)級(jí)調(diào)速裝置,集中潤(rùn)滑系統(tǒng)和訂書架的平衡控制,運(yùn)動(dòng)部位均設(shè)有安全防護(hù)罩,故機(jī)器運(yùn)裝平穩(wěn),噪音低。