The paper designs a motor automatic clutch mechanism, when the cash box cover being opened, this mechanism automatically separates the pressing mechanism and the motor, so as to add money easily. When the cash box being closed, the mechanism automatic joggles, the pressing mechanism smoothly deliveries out of money drived by the motor. Finally, this paper uses finite element analysis software ANSYS identifies key parts shrapnel thickness and shape.%设计一种电机自动离合机构，当打开钱箱上盖时，此机构自动分离，压钞机构和电机分开，从而很方便地加钞票；当打开的钱箱关闭，此机构自动啮合，压钞机构在电机的带动下顺利的出钞票。最后，借助有限元分析软件ANSYS确定了关键零件弹片的厚度和形状。
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