在電腦軟硬體不斷改進，運算速度不斷提昇的現代，更需配合操作簡單、功能強大的電腦軟體，本研究的目的就是設計一個人性化的安全備位機構電腦設計軟體。
本文在理論分析上分成齒輪嚙合模擬、擒縱機構運動分析模擬、擒縱機構動力分析模擬三大類，齒輪與擒縱機構的運動現象區分為接觸、自由飛行及碰撞三個相，並依序推導其運動方程式。
在電腦模擬方面，藉由參數模組化設計之理念，將程式依照齒輪設計、齒輪運動模擬、擒縱器設計、擒縱器運動模擬及安全備位機構模擬之順序來設計。主要內容是以AutoCAD ADS-C語言撰寫，並利用交談框控制語言DCL當輸入參數的介面工具，使參數設計及電腦動態模擬均能在AutoCAD的工作環境完成，不僅操作簡單，而且控制參數變化容易，對擒縱設計者應有助益。

The hardware of the computer is being improved continuously and therefore enhanced the performance of the calculation. By matching with the high performance computer, an easy operation and user friendly computer software is badly needed. The purpose of this study was to construct a software for the design of S&A Devices.
The theoretical analyses were categorized into three parts. They are kinematic analysis of matched gears, kinematic analysis of escapements and dynamic analysis of S&A devices. The dynamic behavior of the mechanical systems was divided into three phases as contact-mode, freeflight-mode, and impact-mode.
By using the concept of modularization, the computer codes were built in the order of design of gears, motion simulation of gears, design of escapements, simulation of escapements and finally the simulation of S&A devices. The AutoCAD ADS-C language was employed for editing the computer code in which the DCL was easy to use for communicating with the users. The program may be executed in the environment of AutoCAD software. The results of this research are useful for those who work on the escapement design.