1.技术要求差动牙架和送料牙架(图1)是GN6系列高速包缝机差动送料机构的一对特殊装置。在缝纫各种易滑移和弹性缝料时,可保证上下两层缝料不产生变形滑延或缩短,在缝纫过程中还起到变换针距的作用,往复频率每分钟高达5000次左右。由于形状复杂,结构精巧,精度要求高,热处理有一定的难度。 1. Technical Requirements The differential frame and the feed frame (Figure 1) is a special pair of GN6 series high speed overlock sewing machine differential feed mechanism. Sewing in a variety of easy slip and elastic material, it can ensure the upper and lower layers of material does not produce deformation sliding or shortening, sewing process also plays a role in changing the needle pitch, the reciprocating frequency of up to about 5000 times per minute. Due to the complex shape, compact structure, high precision, heat treatment has a certain degree of difficulty.