浮纹贾卡经编机纱线选取机构的设计

Design on yarn selection mechanism of broche jacquard wrap knitted machine

为开发浮纹贾卡经编机,研究了其关键构件选纱钩针运动机构的设计问题。经过分析编织工艺、选纱钩针的运动要求,得知为具有2次停歇的往复直线运动,根据运动要求中的变化规律、动程、长距离传动等特点,选择相应运动实现机构为平面连杆-凸轮组合机构,具体采用平面八连杆机构和凸轮机构串联构成。采用图解反转法综合出其中2组平面四杆机构的尺度,用解析法求出滑块机构的尺度和主动凸轮的实际廓线。针对RJWB3/2型浮纹贾卡经编机机型,选纱钩针运动动程为19 mm,在升程、远休止、回程和近休止段对应主轴转角分别为150°、30°、80°、100°,据此设计出平面连杆-凸轮组合机构中各个连杆机构的尺度和主动凸轮的实际廓线。

In order to develop the products of warp knitted broche jacquard,the paper studies the design problem of the corresponding selection hook-needle motion mechanism. The mechanism is the key structure in the machine. The motion of the selection hook-needle requires reciprocating movements with dwells. According to the requirements of variation,stroke,long distance transmission in the expecting motion,the corresponding selection hook-needle mechanism is type synthesized a planar linkage-cam combined mechanism which is connected in series by an eight-bar linkage and a cam mechanism. Then the graphical inversion method is adopted to figure out the dimensions of the two groups of planar four-bar mechanisms. And the dimensions of slide mechanism and curve of cam are built by using analytical method. For the selection hook-needle in RJWB3 /2,the stroke is 19 mm. And the cam angles for rise,outer dwell,return,inner dwell are 150°,30°,80° and 100°,respectively. Based on these parameters the corresponding dimensions of linkages and curve of the cam are designed.