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前言一九六一年作者在讲授冶金机械专业的“机械原理”课时发现,冶金工厂里有不少机械的平面机构应用著名的契贝歇夫公式计算的活动度W>起始构件数时,这种机构仍然具有确定的相对运动。这种现象引起了作者的注意,当时曾收集了一些资料,但因忙于教学,没有及时总结整理。最近天津大学最新主编的“机械原理”(1979)、西北工业大学最新编的“机械设计”上册(1978)以及新编的“常见机构的原理及应用”(1978)等书,仍然不加
Preface In 1961, when the author taught the course of “Principles of Machinery” in the field of metallurgy machinery, he found that there are quite a few mechanized plane organizations in the metallurgical factory that use the well-known Chebyshev formula to calculate the activity W> This mechanism still has a definite relative movement. This phenomenon caught the attention of the author. At that time, some information was collected, but because of being too busy teaching, they did not summarize in time. Recently, Tianjin University, the latest editor of the “Principles of Machinery” (1979), Northwestern Polytechnical University, the latest edition of “Mechanical Design” (1978) and the new “Principles and Application of Common Institutions” (1978)