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Main problems and solutions in rapier loom weaving(2)

Main problems and solutions in rapier loom weaving(2)

Issue Time:2021-07-23
Main problems and solutions in rapier loom weaving(2)

9. Why do the sword belt and sword head squeeze the warp thread when inserting the weft?
In order to ensure the smooth connection of the weft thread, the looper should be moved for a long time in the shed, but the shed should not be opened for long. The longer the idle time, the shorter the movement time of the heald frame. The acceleration of the heald frame movement increases and the impact force becomes great, which is not conducive to the stability of the loom. Therefore, before the strip and the shed end leave the shed, the heald shaft has started to close and the strip and the strip cause a strong compression of the closed warp.


10. Why is the side chain easy to loosen? What are the effects of weaving? How can you prevent it?
The warp threads on the outfeed side can be easily loosened, as the shuttle head and the elastic fabric tape strongly squeeze the warp pieces at the shed exit, which leads to unclear openings and increased fabric defects.
Preventive measures: On the one hand increase the height of the opening accordingly, on the other hand move the baffle forwards in order to shorten half the compartment length, on the other hand the number of reed ends on both sides is slightly smaller than the number in. hold the center and side of the finished loom are turned slightly inward. Bend it to make the side threads a little tighter to enhance the loose edges of the fabric.


11.What is the power of rapier looms related to?
The strength of the striking force mainly depends on the weight of the blade and the acceleration of the blade movement. The acceleration of the movement is great, and the striking force is also great. The new rapier loom uses conjugate CAM whipping, which mainly depends on increasing the acceleration to increase the whipping force.


12. Why does the high speed rapier loom use a conjugate cam impact mechanism?
On the one hand, the high-speed gripper takes over a separate sley, which ensures a longer rest period in the middle of the spine when the weft is inserted. Second, the sley of the high-speed rapier loom is made of an aluminum alloy and the weight of the reed is extremely light. Narrow, no blade cover, light impact mechanism, the only way to increase impact force is to construct conjugate cam impact mechanism to increase acceleration.


13. Why does the rapier loom stop the weft for no reason? How can it be corrected?
One reason is flying hair in the weft clamp or the clamping force is too low, the other reason is the high sensitivity of the piezoelectric ceramic sensor.You can correct the piezoelectric ceramic sensor by cleaning the weft clamp and adjusting the clamping force and reducing the sensitivity.


14. Which threading and creasing methods should be used in the production of fabrics with high warp density on rapier looms?
The flying thread method should be used for fabrics with high warp density. Each leaf should have 3 or 4 heads. The process of 1.1.2.2.3.3.4.4.5.5.6.6 can be used to drop the line to reduce wire breaks and improve efficiency.


15. If the rapier loom uses a stepless weft changing device, why is it easy to change the weft density on the machine?
After setting the weft thread density of the device, the upper frame screws must be tightened with nuts, otherwise the screws can be easily loosened and the weft thread density on the machine changes after loosening.


16. How do I deal with the peeling of the coarse glue that sticks to the sand and guide roller?
When the coarse rubber comes off, the emery roller, guide roller and cloth surface slip, causing the position of the cloth to become unstable, the stop not being tight and also changing the weft density on the loom.
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