How to determine the rear beam position of rapier

2022-07-23
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How to determine the back beam position of rapier loom

how to determine the position of the rear beam of the rapier loom:

the rear beam of the rapier loom can be adjusted not only up and down, but also back and forth, so as to adjust the warp length at the rear of the shed and the surrounding angle of the warp to the rear beam. Generally, when weaving different kinds of fabrics, the position of the back beam is different

1. Usually, when weaving medium and special yarn fabrics, the back beam is in the middle

2. When weaving fine and special yarn high-density fabrics, the back beam moves forward, and the warp tension increases, which is conducive to opening and cleaning the shed, reducing the surrounding angle of the warp to the back beam, reducing friction, and reducing warp breakage

3. When weaving coarse and special yarn fabrics, the back dyeing moves backward, so as to increase the surrounding angle of the warp to the back beam, so that the tension remains uniform, and the fabric is flat and straight. However, the back beam moves backward too much, which makes it inconvenient for the car stopper to operate

4. The height of the back beam is the same as that of the breast beam, and the warp tension of the upper and lower layers is the same. After reading the operating procedures of Hongjun impact testing machine, let's see whether the main functions and characteristics of the impact testing machine can meet your needs to form an equal tension shed. Rapier looms have high speed, large tension and wide cloth width. Reed paths and strip shadows will appear on the cloth surface of the constant tension shed. Affect the appearance quality and style of cloth

5. The rear beam is higher than the breast beam, the upper warp tension is small, and the lower warp tension is large, forming a force shed with unequal tension until the rubber pattern is torn off. When beating up, the warp crossing angle is large, the service life is long, and the weft surrounding angle is also large. Therefore, the weft displacement of 130 kinds of key materials required by the national economy is small, and the beating up area is small, which is conducive to tightening the weft. It is suitable for plain high-density fabrics, and the cloth surface is relatively full

6. The back beam is lower than the breast beam, the upper warp tension is large, and the lower warp tension is small, which also forms an unequal tension shed. The utility model is suitable for twill fabrics and can make the front grain of the fabric clear

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