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第10次课--5-3 Plate Cam with Translating Roller(or Knife-edge)
Graphical Synthesis of Cam Mechanisms 5-3 Plate Cam with Translating Roller (or Knife-edge) Follower If the cam rotates an angle ?B0OB=? counter-clockwise from the beginning, the follower will rise through a corresponding distance BB=S from the lowest position along its guide way. Therefore, motion curve S-? can be understood such ways: The cam is stationary. The frame and the follower rotate ? in the direction opposite to ?. The minimum circle centred at O and tangent to the pitch circle is called the base circle of the cam pitch curve, or prime circle(基圆). The procedure(步骤) to design the pitch curve: If offset e=0, the offset translating follower becomes an in-line translating follower. 2. Graphical Synthesis of Plate Cam with Translating Roller Follower （直动滚子从动件圆盘凸轮） Characteristics: The roller is always tangent to the cam contour(实际廓线) at all times. The locus of the roller centre relative to the cam is called the pitch curve(理论廓线） of the cam. The roller is tangent to the cam contour(实际廓线) at all times, and the cam contour is the envelope(包络线）of the family of the roller circles. The pitch curve (理论廓线) and the cam contour (实际廓线) are parallel(法向等距). The minimum radius of the pitch curve is called the radius rP of the prime circle. Note: the minimum radius of the cam contour is not rP. For the knife-edge follower, the pitch curve and the cam contour are the same. The process to design the cam contour is: 5.4 Plate Cam with Oscillating Roller Follower（摆动滚子从动件圆盘凸轮） In this mechanism, The angular lift(角行程) of the follower is ?max. The motion equations can also apply to the oscillating follower so long as S is replaced by ? and h by ?max The cam contour is obtained by drawing a smooth curve tangent to the family of all roller circles. Since the follower arm must have some physical dimensions, the side edge of the straight arm of the follower may interfere(干涉) with the cam contour. It is necessary to check that this will not occur at all positions. To avoid in
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