What is a stop frame for rapier towel looms
The warp stop frame used in the rapier towel loom is a key device on the loom used to monitor the warp yarn status and ensure weaving quality. Its main function is to trigger the shutdown in a timely manner when the warp yarn breaks or abnormalities occur, avoiding the production of defective products. Here is a detailed introduction:
The warp stop frame used in the rapier towel loom is a key device on the loom used to monitor the warp yarn status and ensure weaving quality. Its main function is to trigger the shutdown in a timely manner when the warp yarn breaks or abnormalities occur, avoiding the production of defective products. Here is a detailed introduction:
1、 Basic structure and working principle
1. Structural composition
Main frame: usually made of metal material, installed on the frame of the loom, spanning the width direction of the loom, used to support other components.
Stop warp piece: Hanging on the stop warp rod of the stop warp frame, each warp yarn passes through the hole of the corresponding stop warp piece. The amenorrhea plates are mostly thin metal plates (such as steel plates), which are lightweight and can swing flexibly.
Conductive system: Some warp stopping frames are equipped with conductive warp stopping plates or conductive rods, which are connected to the weaving machine control system through circuits. When the warp yarn breaks, the stop warp piece falls, connecting or disconnecting the circuit, triggering a stop signal.
Adjustment device: including a height and spacing adjustment mechanism for the warp stopping rod, which can be adjusted according to different yarn thicknesses and fabric densities to ensure monitoring accuracy.
2. Working principle
During normal weaving, the warp tension supports the warp stopping piece to remain suspended; When the warp yarn breaks or loosens, the stop warp piece falls due to its own weight, triggering the sensing mechanism of the stop warp frame (such as conductive circuits, mechanical contacts), sending a stop signal to the loom control system, and the loom immediately stops running to avoid defects such as missing or broken warp.
2、 Special design for towel fabrics
Towel fabrics have a looped structure, and the distribution of warp tension is different from that of ordinary fabrics. Therefore, the design of the warp stop frame has the following characteristics:
1. Adapt to the tension changes in looped weaving
In towel weaving, there is a large difference in tension between the ground warp and the wool warp. The warp stopping frame needs to have more sensitive tension sensing ability to avoid false shutdown or missed detection due to fluctuations in wool warp tension.
Part of the warp stopping frames adopt a partition design, which can adjust the sensitivity of the warp stopping plates in the ground and wool warp areas separately, improving the accuracy of monitoring.
2. Anti interference and wear resistance performance
During the process of forming loops on a towel loom, the warp yarn experiences frequent friction, and the stop warp pieces are prone to poor contact due to wear and tear. Therefore, the stopping plate of the stopping frame is often made of wear-resistant materials (such as stainless steel) or surface coated to extend its service life.
In response to the potential issues of cotton and fiber accumulation in looped fabrics, the design of the warp stopping frame structure places more emphasis on preventing entanglement, such as adding cleaning slots, optimizing the spacing between warp stopping pieces, and reducing the impact of debris on signal transmission.
3. Matching with towel weaving machine technology
Towel looms often use multi arm or cam openings, and the installation position and height of the warp stop frame need to be coordinated with the opening mechanism to ensure stable tension of the warp yarn during the opening process, and that the warp stop piece does not interfere with other components.
For towel fabrics with high loop density, the warp stopping frame may need to increase the number of warp stopping pieces or adjust the arrangement to cover all warp yarns and avoid monitoring blind spots.
3、 Common types and application scenarios
1. Mechanical contact type stop frame
By triggering the mechanical lever or contact point through the falling of the warp stopper, the structure is simple and the cost is low, suitable for medium and low-speed rapier towel looms or scenarios with low automation requirements.
2. Electrical stop frame (conductive stop frame)
The warp stopping piece or warp stopping rod is a conductive material. When the warp yarn breaks, the circuit is conductive or disconnected, and the signal transmission is more sensitive and the response speed is fast. It is widely used in high-speed rapier towel looms, especially suitable for mass production of high-quality towels.
3. Optoelectronic stop frame
By using photoelectric sensors to monitor the position of the warp stop, there are no mechanical contacts, and the anti-interference ability is strong. It is suitable for high-speed and high-precision towel looms and can reduce faults caused by mechanical wear.
4、 Maintenance and Function
1. Maintenance points: Regularly clean the fibers and dust on the warp stopping frame, check whether the warp stopping plate is worn or deformed, and pay attention to the reliability of the circuit connection of the conductive warp stopping frame to avoid poor contact and accidental shutdown.
2. Core function: Ensure the integrity of the warp yarn of towel fabric, reduce defects such as broken and missing warp, improve the fabric qualification rate, reduce manual inspection costs, and enhance the automation level of weaving machines.
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