结合注塑模具设计实例，介绍杠杆先复位机构，并导出了杠杆先复位机构设计计算公式。
This article introduces the previous returning mechanism of lever and deduces the calculation formula about the mechanism with injection molding design as an example.
介绍了一种新型的先复位机构，其结构简单，动作可靠，加工方便，非常适合塑料模具使用。
A new_type pre_reset mechanism was introduced. With simple structure, reliable action and convenient operation, it is well fit for the injection mould.
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