Dynamic Simulation And Analysis On Picking Bill Mechanism Of ATM

Automated flexible-material handling machines have been used increasingly in many applications:from office facilities, such as printer and copier machines used for paper picking and delivering, to fabric-handling devices used in automated garment assembly lines, to bill counters and automated teller machines (ATMs) used for picking and delivering bills. Especially, these problems, such as bill jamming, overlapping, tearing etc, been occurred in the dispensing bill process. So, it is the most important to design a reasonable picking and delivering mechanism to insure dispensing bill stably and reliably.The author derived bill’s equations of motion based on interaction forces of twisting roller, stripping roller and guiding roller. And used modified Coulomb friction model to take the place of contact force of rollers. We divided picking process into three steps, twisting, separation and feeding steps, and built mechanical models respectively.The author utilized MATLAB to program and to compute the effect of parameters in each step. Such as successful rate influenced by twisting roller’s speed and normal force loaded on bills in the twisting process; delay rate influenced by stripping roller’s torque and normal force on bills in the separation process of adherent bills and single bill; delay rate influenced by inertia, normal force and dynamic friction coefficient. Then received the relevant parameters of curves and optimized parameters.The author utilized RecurDyn’MTT2D/3D (Media Transport Toolkit) to discuss the bill’s dynamic of each step in the picking mechanism. And compared the date obtained between computation and simulation, confirmed the veracity of dynamic model.