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Outstanding lubrication advertising engraving machine drum gear coupling is necessary to ensure safe and reliable work, is also slowing down the wear. Outstanding lubrication is necessary to drum gear coupling is safe and reliable to ensure is slow work, wear. In tooth root strength and meet the twists and turns of contact strength of tooth surface conditions should be to have a greater degree of coincidence to have the tooth width, not consciously adding the tooth width, advertising engraving machine should avoid making the structure scale not to add. Advertising engraving machine general tooth width coefficient is 8-14. The minimum width of teeth root should be allowed stress must also consider the focal point, by inter axle inclination caused by the displacement along the tooth width needed width. Marching drum gear coupling with an important way of life. The tooth root bending strength and contact strength of tooth surface influence coefficient of tooth width, tooth width coefficient is big, the two strength is big, the tooth width coefficient affect the coincidence degree, in the tooth width coefficient is less than a certain value scale, its value increases a greater impact on the coincidence degree to add, in greater than the certain value and value increasing to the coincidence degree added effect becomes smaller, the drum gear coupling arc drum curve, parameters of tooth width is still must drum degree circle radius also backlash, tooth width is greater, the greater the radius of the circular drum, side clearance required more. Therefore, advertising engraving machine requires the following request: a tooth gathering load smaller is better, and the tooth surface curvature and the drum is proportional to the degree of PI, so the roundness radius as perhaps the large drum. The drum degree of curvature radius and inner gear unilateral reduction is proportional to the degree of Bo Liangcheng, so the drum radius should as far as possible to the big. Advertising engraving machine drum degree of curvature radius and inner gear unilateral reduction is proportional to the Bo Liangcheng, i.e. it is related with the gap tooth meshing, thinning may constitute a lack of interference, thinning excessive weakening tooth strength, and great side gap.