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一、关于主夹板孔的不同心度不带有日历、自动上条等附加机构的普通机械式手表,如国产19钻“东风”牌手表,是由大小145个零件组装而成。主夹板是机心当中一个最大的零件,其直径为27毫米,厚度为3毫米,上面布满了槽和孔,为机心之主体(图1)。主夹板上共有41个孔,其中 A 孔是加工定位用的“定位孔”,也叫“基准孔”。B 孔是齿轮轴的轴孔,孔内要镶入“人造宝石轴承”。C孔是位钉孔,中间镶有“定位钉”,保证与相关零件的正确联结。在实际生产过程中,为了检查其座标位置偏差的。除去主夹板外,还有五块较小的夹板与主夹板相对应,即条夹板、中夹板、上夹板、叉夹板、摆夹板。这五块小夹板都是通过镶在主夹板上的定位钉与主夹板相联结的,并用螺钉紧固牢。很多齿轮、齿轴、摆轮等都装配在上述主夹板与各小夹板之间,构成了机心(图2)。
First, on the main plywood holes do not have the different degree of heart calendar, automatic winding and other additional institutions ordinary mechanical watches, such as domestic 19 drill “Dongfeng” brand watch is assembled by the size of 145 parts. The main plate is one of the largest parts of the movement. It has a diameter of 27 mm and a thickness of 3 mm. It is covered with grooves and holes as the main body of the movement (Figure 1). A total of 41 holes on the main plate, which A hole is used for processing positioning “positioning hole”, also known as “benchmark hole.” B hole is the gear shaft axis hole, the hole to be set in “artificial gem bearing.” Hole C is a pin hole, the middle set with “positioning pin” to ensure the correct connection with the relevant parts. In the actual production process, in order to check the coordinate position deviation. In addition to the main plate, there are five smaller plywood and the main plate corresponding to that strip bar, the plywood, plywood, fork plywood, put plywood. These five splinters are attached to the main plate by means of locating pins attached to the main plate and fastened with screws. Many gears, pinions, balance wheels and the like are assembled between the above-mentioned main plate and each small plate to form a movement (FIG. 2).