- 學位論文
嬰兒搖籃擺動機構的改良設計
A Modified Design on the Swing Mechanism of a Baby Swing Device
摘要
嬰兒搖籃主要用來讓嬰兒能在短時間內安靜休息或睡眠，因此其擺動設計應以平順為主要考慮，但是目前現有產品尚未達到此種要求。因此本研究主要目的在於設計出符合此要求的擺動機構，主要改良的項目包含：(1) 凸輪設計，為決定搖籃擺動時主要的設計因子；(2)馬達控制，因應嬰兒的不同狀態而使馬達的轉動速度帶動搖籃的擺動頻率能夠相輔。 本研究首先對既有的嬰兒搖籃的相關文獻加以蒐集、分類與分析，了解其設計重點、作動原理與優缺點，再針對現有的一種電動式嬰兒搖籃分析其擺動機構設計，並以搖籃擺動之角加速度最小且變化最小為原則，進行擺動機構的改良設計，使其擺動符合需求。改良設計主要是改良擺動機構中的凸輪，依據期望之搖籃擺動總力矩為定值，利用數值方法得出凸輪輪廓之形狀，此改良設計已製作一原型機，經過實際量測證實其符合設計需求而且確實改善原電動搖籃之缺點。本研究也使用單晶片微處理器對馬達的轉動加以控制，提供多種搖籃擺動的頻率，使其符合嬰兒睡眠習慣或其它狀態所需的擺動頻率，充分達到電動嬰兒搖籃的功能。
並列摘要
The main purpose of using baby swing device is to pacify a baby or let a baby quickly fall asleep. Therefore, a smooth swing-motion is one of the major requirements for designing a baby-swing device. However, as far as author knows, there is no commercial product to satisfy such requirement. The aim of this study is to modify a current swing mechanism design. The modified design includes two parts:(1) Cam design, which is the main design factor affects the cradle swinging, (2) Motor control, which can change the swing frequency of the cradle in accordance with a baby in different situations. Firstly, this thesis presents the analysis of a motor-driven baby-swing mechanism to understand its design purposes and how it works, and gives some comments. Secondly, we analyze the swing mechanism design of a commercial cradle based on the conditions of minimum angular acceleration and minimum variation of angular acceleration. We modified the swinging mechanism to reach the requirements. The main task is to modify the cam of the swing mechanism. The cam profile is derived from the condition of a constant torque for swinging the cradle. Numerical method is used to obtain the cam profile. A prototype of this modified design has been made, and its feasibility has been confirmed. This study also presents a design for controlling the rotation of the driving motor by using chip. The different speeds of the driving motor generate many different swinging frequencies of the cradle to fit all kinds of situation for baby. Therefore, it could provide more effective functions for the baby swing device.