劍桅機構之類型合成與運動、動力特性分析

韌性劍桅驅動機構的功能係驅動帶輪，使帶輪做大於2π的往復旋轉運動，再驅動纏繞在帶輪上的韌性劍桅機構往復直線運動，以便韌性劍桅前端的夾紗器與接紗器做往復交接動作，進而完成投緯過程。本文在於利用類型合成之方法，加入設計條件，進而找出新型機構。本文首先介紹無梭織布機的組成與動作原理。接著加入運動構造與需求之設計條件，利用簡單常見接頭種類，以兩個迴路來設計新型機構。未避免合成後桿件過多，合成後機構桿件數目不宜超過五個桿件。此外，為避免過大的加速度使緯紗在射出時，而產生斷裂之現象，本研究適當地設計一輸入轉速函數以改善劍桅機構的運動及輸入扭矩等動力特性。最後，本研究亦利用向量迴路法針及機器動力學理論對所合成出新型的劍桅機機構進行運動與動力分析以驗證本文所提理論的可行性。

關鍵字

變轉速函數；劍桅機構

並列摘要

A flexible rapier drive mechanism is a device for driving gearwheel that can rotate back and forth with large angle to control the movement of gripper carrying straps of weft insertion members in the shed of shuttle less weaving loom. The purpose of this work is to use the method of type synthesis and design criteria to obtain new and feasible rapier mechanisms. First, this work described the compositions of rapier mechanism and presented the design requirements of the exiting design. Based on the design requirement, we synthesis new rapier mechanisms with two loops. Additionally, the number of links of thee designed mechanisms is less than five. When the maximum peak value of acceleration of weft insertion members is large, the loom will break. The author designs an input speed function to reduce the maximum peak value of acceleration. The deigned speed function also reduces the dynamic characteristics. Finally, we derive the kinematic and dynamic analysis for a variable-speed rapier mechanism to prove the feasibility of provided theory.

並列關鍵字

rapier ； variable rotating speed functiom

參考文獻

Horizons, pp. 38-43, Nov 1996.

Grippers in Looms, ” United States Patent No. 4,052,906,1977.

[12] Threlfall, D. C., ‘The Inclusion of Coulomb Friction in Mechanisms Programs Particular Reference To DRAM,’ Mech. Mach. Theory Vol. 13,pp.475-483.1978.

Shuttleless Weaving Looms,” United States Patent No. 4,624,288,1986。

[1] 蔡武融，”變導程螺桿傳動機構之運動靜力分析”，碩士論文，國立成功大學機械工程研究所，1992 年5 月。