Abstract:

In consideration of the errors of the measurement data created in the current cam production, and cams’ contour curve deformed damaged after abrasion, a novel  method of smooth and reverse design of conjugated cams in the weft insertion mechanism based on the limited measurement points was presented. In addition, a smooth and reverse software of the conjugate cam was developed using MatLab. Two-order continuous differentiable three spline function was used in this software to fit the data of conjugated cams. The curvature of the new curve was continuous and changes slowly. Geometric-relations were used to obtain the contour curve of the auxiliary cam. The motion laws of cam follower were obtained by UG intelligent point and motion simulation function. In order to improve the motion law of the follower, the modified trapezoid acceleration law was used in the conjugated cams of the weft insertion mechanism. A cam projile is obtained by using  inversion method and the envelope equation. After verification, the reverse cam can satisfy the requirements of weft insertion. It also provides a reference method for the design of the conjugated cams of the weft insertion mechanism.

Key words: weft insertion mechanism, conjugated cam, smooth design, reverse design, contour curve of cam