本机型是综合送料厚料平缝机（单针）的最新版，采用大型卧式旋梭勾线，连杆式天枰（最新设计）挑线，上下轴用滚针轴承支承，同齿形带传动，柱塞式油泵润滑系统。采用针杆摆动与压脚、送布牙同步送料方式。整机在综合性能上传动轻滑，噪声小，耐用度高，并设有保护旋梭超负荷的离合装置，确保了缝制品质量和旋梭的安全。本产品最粗车至18股线，针距达到12mm/针。特别适用于汽车座垫、脚垫、安全带、安全气囊等制及包边，还可适用于沙发、账蓬、降落伞、凉席、船帆等大型器具的缝制。

This model is the latest product of compound feed lockstitcher (Single needle）, which is designed with large vertical rotating hook (Specially for thick thread) for thread loop catching and sliding bar for thread up-taking. The application of the needle bearings for arm shaft and hook shaft, cog belt driving, plunger oil pump for automatic lubrication. Compound feeding by needle bar, presser foot and feed dog provides this series with such splendid features as smooth running, quiet working and long service life. It is also equipped with a safety clutch to prevent the hook from damage by over-duty operation. This machine is derived from 4400, which increased the working space (520mm*150mm), it will sew 20 plies twisted thread at maximum, the stitch length gets to 12mm/needle. So it is especially availablein stitching car seats, safety belts,safety air bags, tents, parachutes, mat, sails, etc.