What is the function of the 2-row warp stop frame used in the rapier towel loom
In the rapier towel loom, the use of two rows of warp stopping frames is designed for the special weaving requirements of towel fabrics. Its core function is to control the warp state, improve weaving stability, and adapt to the organizational structure characteristics of towel fabrics. The specific functions are as follows:
In the rapier towel loom, the use of two rows of warp stopping frames is designed for the special weaving requirements of towel fabrics. Its core function is to control the warp state, improve weaving stability, and adapt to the organizational structure characteristics of towel fabrics. The specific functions are as follows:
1. Separate and control different types of warp yarns to adapt to the complex structure of towel fabrics
The warp yarns of towel fabrics are usually divided into two categories:
Ground fabric: used to form the basic structure of a fabric (i.e. "ground fabric"), determining the strength and stability of the fabric;
Mao Jing: Used to form the loops (fibers) on the surface of towels, it is the key to the fluffy texture of towels.
Two sets of warp stopping frames can correspond to the warp and wool warp systems respectively, achieving independent threading and control of the two types of warp yarns. By separating and arranging them, it is possible to avoid entanglement and interference between the ground warp and the wool warp during the weaving process, ensuring that the wool warp forms loops according to the design rules, the ground warp forms a stable base, and the structural integrity of the towel fabric is guaranteed.
2. Monitor warp yarn breakage correctly to reduce weaving failures
The core function of the warp stop frame is to monitor whether the warp yarn is broken through a warp stop piece (a metal piece worn on the warp yarn): when a warp yarn breaks, the corresponding warp stop piece falls, triggering the warp stop mechanism, and immediately stopping the loom to avoid fabric defects (such as missing warp and jumping) caused by yarn breakage.
When using a 2-column stop frame, the monitoring of the broken ends of the ground and wool meridians can be carried out separately:
When the ground meridian is cut off, the corresponding stopping mechanism of the column is activated to avoid damage to the ground fabric structure;
When the hair is cut off, the other stopping mechanism responds separately to prevent missing or disorderly hair loops.
This type of classification monitoring can improve the accuracy of breakage detection, reduce ineffective shutdowns caused by "one breakage, all shutdowns", and facilitate operators to quickly locate the type and position of yarn breakage, shortening processing time.
3. Adapt to differences in warp tension and improve fabric quality
The tension requirements for ground and wool meridians are different:
The ground needs to maintain a high tension to ensure that the ground fabric is flat and the structure is stable;
The tension of the woolen yarn is usually low and needs to dynamically change with the formation of loops (such as controlled by a fuzzing mechanism).
Two sets of warp stopping frames can be combined with different warp tension adjustment systems (such as independent warp stopping rods and tensioners) to control the tension of ground warp and wool warp separately, avoiding warp breakage and uneven size of loops caused by mismatched tension, ensuring the flatness and consistency of the towel fabric.
4. Optimize warp efficiency for easy process adjustment
The warp density of towel fabrics (especially wool warp) is usually high, and the number and arrangement of ground warp and wool warp are different. Two sets of warp stopping frames can be separated according to the type of warp yarn, reducing confusion during the warp process and improving warp efficiency; At the same time, when it is necessary to adjust process parameters such as loop height and density, the stopping frame where the warp is located can be adjusted separately (such as changing the arrangement of stopping pieces and tension settings), without interfering with the warp system, enhancing the flexibility of process adjustment.
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