Looms have five major movements, which are shedding, weft insertion, beat-up, let-off and take-up movements. The shedding movement is based on the requirements of the fabric structure. The shedding mechanism drives the heald frame to move up and down. The warp threads worn on the healds are divided into upper and lower layers to form a shed and create conditions for weft insertion. The weft insertion movement is to guide the weft thread on one side of the shed to the other side of the shed through the weft insertion mechanism. The beating-up movement is a steel reed in the beating-up mechanism that beats the weft threads in the shed to the cloth fell, so that the weft threads and warp threads are interwoven into a fabric with a certain degree of tightness. The warp let-off movement is where the warp let-off mechanism continuously sends out the warp threads on the warp beam to keep the warp thread tension constant so that weaving can continue. The winding movement is that the winding mechanism guides the fabric through the breast beam, pressure roller, and winding roller, and then winds it on the winding roller with uniform tension. Whether it is a shuttle loom or a shuttleless loom, weaving is completed through the above five movements. Therefore, the five movements are the basis of the loom and are indispensable movements. The cooperation of the five major movements of the water-jet loom during the normal operation of the weaving process can be seen in the “weaving movement diagram” (Figure 50).
The coordination of each movement time of the water-jet loom is mainly based on fabric specifications, warp and weft raw material properties, and shedding mechanism and weft insertion mechanism and other factors, the setting should be comprehensively considered. Under normal circumstances, the reed width is about 160cm, the parking position of the loom is 180°~270°; The opening and closing of the device is 110°~270°; the hemming and leveling time is: 280° for the left hem and 20° for the right hem. Of course, in case of special circumstances, specific analysis and testing are required, and the time for close coordination of the five major movements of the loom is also different, and appropriate adjustments should be made.
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