Constant tension doubling system

Abstract

The invention relates to a constant-tension plying system. The constant-tension plying system comprises two yarn paths arranged side by side, and the two yarn paths collect yarns unwound by the two yarn paths separately and then wind the yarns on the same bobbin. Each yarn path comprises a buoy communicating with an air channel and a spring support arranged on the air channel. The constant-tension plying system is characterized in that each air channel is provided with a pressure valve, and each spring support is held on the corresponding pressure valve through buffering with a hold-down spring; each buoy comprises an upper cap and a lower cap sleeved with the upper cap; the lower caps are fixedly arranged, the upper caps can float up and down according to the magnitude of air pressure, and the top of each upper cap is provided with a press groove for allowing the corresponding yarn to pass through; the two sides of each press groove are each provided with a yarn guide wheel, and a guide wheel is arranged inside each press groove; and each spring support is provided with an unwinding transmission device.

Description

technical field [0001] The invention relates to a weaving device, in particular to a constant tension doubling system. Background technique [0002] Cone cone yarn has many advantages such as easy unwinding, not easy to fall off, etc. In the whole spinning process, cone cone yarn is an indispensable yarn weave form. Due to the needs of the next process, many processes often require the production of cones. shaped yarn. [0003] The doubling machine can usually combine two single yarns to form a plied yarn (twisted ply). Usually the most important issue in plying is to control the two yarns to maintain the same tension during plying, so that the two single yarns form a single yarn. There will be no problem of long and short threads when plying. If there is a problem of long and short threads, the ply yarn will easily break in the next two-for-one twisting stage, and it will also easily appear "small tails" on the twisting thread. Therefore, it is necessary to strictly contro...

AI Technical Summary

Problems solved by technology

[0004] Further, the problem encountered in doubling is that when the two bobbins are unwound and plied at the same time, the remaining yarns in the two bobbins are not necessarily the same, especially when there is very little remaining in one bobbin (yarn bobbins smaller diameter), and there is a lot of remaining yarn in the other package (the diameter of the yarn package is larger), and one meter of yarn is also unwound. Packaged yarn with a larger diameter, further, within the unwinding length of the yarn unit, the number of unwinding turns is more than a month, and the unwinding tension of the upper line is greater

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