Since cannon drum of agile shell-feeding system rotates frequently and intermittently

its movement must be steady.Outline of driving cam determine the movement of cannon drum

it is necessary to select the proper outline of cam. Through analysis of parabolic outline and cycloid outline of the cams

the outline that combines the two curves is obtained.According to the demand of production

the value of the outline is revised

and then the method of fitting curve is used to get the expression of the angle of cam and the displacement of the driven part.Through analyzing the movement of the cannon drum

it is suggested that the angle of the cam is proportion to the displacement of the driven part.The cam with the specially derived outline can move steadily.