On the basis of the analysis of typical orthogonal crankrocking lever spatial mechanism for the weft insertion in rapier looms, the rules of the outputting lever motion and the mechanism pressure-angle variety are stu...On the basis of the analysis of typical orthogonal crankrocking lever spatial mechanism for the weft insertion in rapier looms, the rules of the outputting lever motion and the mechanism pressure-angle variety are studied when the maximum swing angle of rocking lever and the length of outputting lever have different values, and the optimum parameters suitable for motion transmission can be chosen. At the same time some existing shortpoints of the mechanism are also pointed out.展开更多
A new type of rapier drive for flexible rapier loom through conjugate cams with five-bar linkage mechanism is raised and analyzed. Two designs suitable for the conversion of 1515-190.5 shuttle looms are given as examp...A new type of rapier drive for flexible rapier loom through conjugate cams with five-bar linkage mechanism is raised and analyzed. Two designs suitable for the conversion of 1515-190.5 shuttle looms are given as examples. This mechanism can be applied to traditional shuttle looms as well as to new flexible rapier loom design.展开更多
A modified trapezoid acceleration pattern with a constant speed part is introduced for loomrapier motion driven by cam.The pattern can meet the time requirement of rapier on entering andleaving the shed,and can satisf...A modified trapezoid acceleration pattern with a constant speed part is introduced for loomrapier motion driven by cam.The pattern can meet the time requirement of rapier on entering andleaving the shed,and can satisfy the condition when the period duration of inserting is not equal tothat of withdrawing.Meanwhile,the pattern can also reduce the maximum acceleration of rapierand make the derivatives of rapier acceleration change continuously without any abruptness ofjerks.展开更多
Based on the requirements of the two-phase rapier loom’s beat-up system characteristics, the dynamic responses of its beat-up system to three different types of cam input motion are studied in this paper. Also, their...Based on the requirements of the two-phase rapier loom’s beat-up system characteristics, the dynamic responses of its beat-up system to three different types of cam input motion are studied in this paper. Also, their corresponding analytical comparisons are made. At the end of the paper, the authors put forward a proposal of new type cam beat-up motion for future practice.展开更多
For a complicated high speed reciprocating machine to meet the requirements of precise motion of its mechanisms, a study of its kineto-elastodynamies is necessary. Here is an example to find out the cause of the misen...For a complicated high speed reciprocating machine to meet the requirements of precise motion of its mechanisms, a study of its kineto-elastodynamies is necessary. Here is an example to find out the cause of the misengagement of flexible rapiers, by means of kineto-elastodynamic analysis, so as to meet the requirements of flexible rapier loom′s design, with beat-up and weft insertion mechanisms operating at high speed.展开更多
针对挠性剑杆织机变导程螺杆设计问题,以曲柄转角作为唯一变量,提出变导程螺杆传剑机构建模方法及初始导程边界控制条件与调节方法,给出变导程螺旋线的设计方程;以椭圆比函数作为剑杆运动规律,仿真分析不同椭圆比系数对剑杆初始加速度...针对挠性剑杆织机变导程螺杆设计问题,以曲柄转角作为唯一变量,提出变导程螺杆传剑机构建模方法及初始导程边界控制条件与调节方法,给出变导程螺旋线的设计方程;以椭圆比函数作为剑杆运动规律,仿真分析不同椭圆比系数对剑杆初始加速度及变导程螺杆导程曲线的影响。结果表明:剑杆初始加速度不能为0 m/s 2;随着椭圆比系数增加,导程函数初始值增加,但升程阶段导程函数呈现非单调性变化,对应椭圆比系数范围为0.15~0.30;当椭圆比系数为0.2时,2种不同幅宽所对应螺杆导程变化率均约为27%,可为实现不同幅宽织机螺杆系列化设计提供理论参考。展开更多
文摘On the basis of the analysis of typical orthogonal crankrocking lever spatial mechanism for the weft insertion in rapier looms, the rules of the outputting lever motion and the mechanism pressure-angle variety are studied when the maximum swing angle of rocking lever and the length of outputting lever have different values, and the optimum parameters suitable for motion transmission can be chosen. At the same time some existing shortpoints of the mechanism are also pointed out.
文摘A new type of rapier drive for flexible rapier loom through conjugate cams with five-bar linkage mechanism is raised and analyzed. Two designs suitable for the conversion of 1515-190.5 shuttle looms are given as examples. This mechanism can be applied to traditional shuttle looms as well as to new flexible rapier loom design.
文摘A modified trapezoid acceleration pattern with a constant speed part is introduced for loomrapier motion driven by cam.The pattern can meet the time requirement of rapier on entering andleaving the shed,and can satisfy the condition when the period duration of inserting is not equal tothat of withdrawing.Meanwhile,the pattern can also reduce the maximum acceleration of rapierand make the derivatives of rapier acceleration change continuously without any abruptness ofjerks.
文摘Based on the requirements of the two-phase rapier loom’s beat-up system characteristics, the dynamic responses of its beat-up system to three different types of cam input motion are studied in this paper. Also, their corresponding analytical comparisons are made. At the end of the paper, the authors put forward a proposal of new type cam beat-up motion for future practice.
文摘For a complicated high speed reciprocating machine to meet the requirements of precise motion of its mechanisms, a study of its kineto-elastodynamies is necessary. Here is an example to find out the cause of the misengagement of flexible rapiers, by means of kineto-elastodynamic analysis, so as to meet the requirements of flexible rapier loom′s design, with beat-up and weft insertion mechanisms operating at high speed.
文摘针对挠性剑杆织机变导程螺杆设计问题,以曲柄转角作为唯一变量,提出变导程螺杆传剑机构建模方法及初始导程边界控制条件与调节方法,给出变导程螺旋线的设计方程;以椭圆比函数作为剑杆运动规律,仿真分析不同椭圆比系数对剑杆初始加速度及变导程螺杆导程曲线的影响。结果表明:剑杆初始加速度不能为0 m/s 2;随着椭圆比系数增加,导程函数初始值增加,但升程阶段导程函数呈现非单调性变化,对应椭圆比系数范围为0.15~0.30;当椭圆比系数为0.2时,2种不同幅宽所对应螺杆导程变化率均约为27%,可为实现不同幅宽织机螺杆系列化设计提供理论参考。
