Five-link double-cam driving mechanism for tuck-in selvage bearded needle

Abstract

A five-link double-cam driving mechanism for a tuck-in selvage bearded needle comprises a bearded-needle rotation conjugate cam and a roller moving driven piece conjugate cam mechanism. The bearded-needle rotation conjugate cam is fixedly connected to a cam shaft through a key; a swing rod is hinged to a box through a bearing to form a revolute pair, two rollers respectively contacting with the bearded-needle rotation conjugate cam are mounted on the revolute pair; the bearded-needle rotation conjugate cam, the swing rod, the rollers and the box form a roller swinging driven piece conjugate cam mechanism; one end of a connecting rod is hinged to the swing rod through a spherical bearing to form a spherical pair, the other end of the connecting rod is hinged to a bearded-needle rotating arm through a spherical bearing to form a spherical pair; the bearded-needle rotating arm is fixedly connected with a bearded-needle retractable shaft, and the bearded-needle retractable shaft is hinged to the box through a sliding bearing to form a cylindrical pair; the swing rod, the connecting rod, the bearded-needle rotating arm, the bearded-needle retractable shaft and the box form a spatial five-link mechanism; the bearded-needle rotation conjugate cam, a bearded-needle movable sliding seat, the rollers, the bearded-needle retractable shaft and the box form the roller moving driven piece conjugate cam mechanism. By the five-link double-cam driving mechanism having the advantages of few kinematic pairs and the like, processing cost can be reduced, processing difficulty can be lowered, and influences of kinematic pair gaps on kinematic errors of the bearded needle can be reduced.

Description

technical field [0001] The invention relates to a five-link double-cam driving mechanism for crochet needles with side folded in, and belongs to weaving equipment and weaving technology in the field of textile machinery. Background technique [0002] The tuck-in device is used for weaving smooth-edged fabrics on shuttleless looms, hooking the excess weft yarn left outside the selvedge into the shed, and interweaving with warp yarns to form a smooth-edged fabric. There are four sets of conjugate cams in the mechanical folding-in device to control four actions respectively. One of the key actions is the movement and rotation of the crochet needle. The movement accuracy of the crochet needle rotation is the key factor affecting the crochet action accuracy. Precision control is the key technology in the folding device. [0003] What adopted in the prior art is that the conjugate cam-space four-bar linkage mechanism drives the crochet needle to rotate, see figure 1 , 2 , 3 sho...

AI Technical Summary

Problems solved by technology

Among them, it is difficult to process the edge-cut hole, and the accuracy is not easy to guarantee. The gap between the two has a great impact on the movement accuracy of the crochet needle, and the magnification of the error is large, resulting in poor adaptability to high-speed crochet movement of the edge-folding device and high processing costs.

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