PL-贴条装置 PMD-松紧装置 PQ-上线普通线,下线普通线和松紧线 PTV-打折装置 PSM-打揽装置 PSSM-松紧和打揽装置 PL-for tape attaching PMD-for elastic device PQ-for normal upper thread, normal lower elastic bottom thread PTV-For pintucking PSM-for smocking PSSM-for smocking and elastic