At present , the model of drafting assembly manufactured domestically and abroad , which is the key part of spinning frame , mainly includes skf model , ina - v model and hp model , etc . while numerous spinning frames manufactured by our country adopt skf model drafting mode which employs spring cradle pressurization and proparea long and short apron drafting , owning advantages of stable running and others 目前國內外制造的細紗機關鍵部分牽伸裝置的形式主要有skf型、 ina - v型、 hp型等幾種。而我國制造的細紗機多數采用skf型牽伸形式,這種牽伸形式采用彈簧搖架加壓、前區(qū)長短皮圈牽伸,有其運轉穩(wěn)定等特點。