浮纹贾卡经编机纱线选取机构的设计

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19mm ，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。

Design on yarn selection mechanism of broche jacquard wrap knitted machine

In order to develop the products of warp knitted broche jacquard, the paper studies the design problem of the correspinding selection hook-needle motion mechanism. The mechanism os the key structure in the machine. The motion of the selection hook-needle requires reciprocating mowements with dwells. According to the requirements of the requirements of variation, stroke, long distance transmission in the expecting motion, the correspinding 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-barmechanisms. And the dimensions of slide mechanism and curve of can are built by using analytical method. For the selection hook-needle in RJWB3/2, the stroke is 19 mm. And the cam nagles 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.