Methodological approach to digital control system for portable shadow engraving machine

LIU Guo-tian1，3， WEI Xing2，3， ZHOU Yao3， CAI Bing4
（1. Engineering Research Center of Safety-critical Industry Measure and Control Technology of Ministry of Education， Hefei 230009， China；  2 . Post-doctoral Research Institute of Computer Science and Technology，
Hefei University of Technology， Hefei 230009， China；  3. School of Computer and Information，Hefei University of Technology， Hefei 230009， China；  4. Hefei MinLi Laser Machine Co. Ltd.， Hefei 230001， China）

Abstract： In order to overcome the drawbacks of traditional shadow engraving machine such as enormous size and offside operation，a methodological approach to digital control system for portable shadow engraving machine was presented. Firstly，a mechanical structure was brought out which comprising slide bar，screw rod，slipper block and print needle. Secondly，the actuating mechanism and sinusoidal subdivision driving circuit for electrical motor were discussed. Thirdly，a control system adopting single chip micro computer STC11F32XE as kernel was proposed. The impressive effect of a shadow-carved grayscale image was exhibited at last. Test result shows that above-mentioned scheme has an important application prospect due to its perfect expandability and portability.
Key words： digital shadow engraving machine； sinusoidal subdivision driving； STC11F32XE single-chip computer