Crochet needle bed movement control cam

The utility model belongs to the technical field of warp knitting machine components, and particularly relates to a crochet needle bed movement control cam of a multi-bar warp knitting machine. The crochet needle bed movement control cam comprises a wheel disc and a shaft neck integrated with the wheel disc. The shaft neck is connected with a cam shaft. The peripheral surface of the wheel disc is an external motion cycle curved surface. The other surface, opposite to the shaft neck, of the wheel disc is provided with an internal motion cycle curved surface, wherein the external motion cycle curved surface and the internal motion cycle curved surface are conjugated. The internal motion cycle curved surface and the external motion cycle curved surface are each composed of a fast ascending motion segment, a first slow ascending segment, an ascending halt segment, a halt segment, a first slow descending segment, a fast descending segment, a second slow descending segment and a second slow ascending segment. The internal motion cycle curved surface is a leading curved surface controlling cyclic motions of a crochet needle bed. According to the crochet needle bed movement control cam, the control curved surface is gentle, the motion segments are distributed fine and reasonably, and the cam is regular in shape, small in dimension span, is low in impact and abrasion, stable in drive in the control drive process, and is high in control drive speed and efficiency.