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本機型是綜合送料厚料平縫機（雙針）的最新版，采用大型立式旋梭（粗線專用旋梭）勾線，滑桿挑線。上下軸用滾針軸承支承，同步齒形帶傳動，柱塞式油泵潤滑系統。采用針桿擺動興壓腳、送布牙同步送料方式。整機在綜合性能上傳動輕滑，噪聲小，耐用度高，并設有保護旋梭超負荷的離合裝置，確保了縫制品質量和旋梭的安全。本產品在4400基礎上改進，加大操作空間（330mmx125mm),車線最粗車至20股線，針距達到12m

This model is the latest product of compound feed lockstitcher (Double 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 (330mm*125mm), 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.