Synchronizes the feed of upper and lower layers of material by top and bottom feeding mechanism while sewing in flationary materials and latently movable materials of medium and heavy weight.

• 上下送料厚料平缝机使用上下送布牙送料，对膨体类缝料和潜移性较大的中厚料，在缝纫过程中能使上下层的送料量达到一致；