What is Laser weft feeder? How do they work?

In the textile industry, the Laser weft feeder can be considered an "upgraded and enhanced" version of a regular weft feeder. It is smarter and faster than traditional equipment, and is mainly installed on high-speed looms to ensure that the yarn is in perfect condition before entering the loom.

We can understand it simply as an advanced yarn dispatcher with **"laser eyes"**.

• Core Components of the Laser Weft Feeder

These components work together to allow the Laser weft feeder to handle extremely fine or easily broken yarns:

→ Laser Sensor (Laser Eye):

This is its most unique feature. It uses a laser beam to scan the yarn on the yarn storage drum. Compared to ordinary infrared or mechanical switches, the laser can accurately count how many turns of yarn are on the drum, and can even detect tiny burrs or knots on the yarn.

→ High-Precision Yarn Storage Drum:

A cylindrical base. Because it needs to work with laser detection, its surface is treated with extreme precision, with special requirements for reflectivity and smoothness.

→ High-Speed ​​Brushless Motor:

This type of motor starts quickly and stops steadily, keeping up with the instructions of the laser sensor, instantly completing the yarn replenishment or stopping the rotation.

→ Intelligent Tension Controller:

Located at the outlet, it acts like an automatically adjusting "brake," fine-tuning the tension in real time according to the thickness of the yarn and the speed of the loom.

→ Anti-Tangle Yarn Guide:

Specially designed inlet and outlet to prevent static electricity or tangling of the yarn during high-speed operation.

• How does it work?

The working logic of the Laser weft feeder is very rigorous, mainly divided into the following steps:

→ Real-time Laser Monitoring:

When the machine starts, the laser sensor emits one or more weak laser beams to scan the yarn storage drum. It can very accurately sense the actual position and quantity of yarn remaining on the drum. This "non-contact" detection method will not damage the delicate yarn.

→ Dynamic and Fast Yarn Replenishment:

Once the loom draws the yarn away, the laser sensor immediately detects that the stock has decreased. It instantly transmits the signal to the motor, which then drives the winding arm to rotate, replenishing the yarn from the large yarn spool onto the drum. This process is very fast; it replenishes the yarn almost as soon as the loom uses it.

→Constant Tension Release:

As the yarn feeds from the Laser weft feeder to the loom, it passes through a tension controller. Regardless of whether the large yarn spool is full or nearly empty, the weft feeder ensures that the yarn fed into the loom maintains consistent tension, preventing fluctuations in tightness.

→Fault Warning:

If the yarn breaks or the large spool runs out, the laser system can detect the anomaly within one ten-thousandth of a second and stop the loom, preventing the production of defective fabric.

• What are its advantages?

Compared to ordinary weft feeders, the biggest advantages of the Laser weft feeder are its **"precision" and "speed"**.

→Gentle on Yarn:

Laser detection does not come into contact with the yarn, making it suitable for weaving high-end fabrics such as silk and fine cotton yarn.

→Strong Adaptability:

Whether it's transparent synthetic fibers or dark wool yarn, the laser can accurately identify them, unlike ordinary sensors that might misread due to variations in color.

→Extremely High Efficiency:

It can support the loom operating at extremely high speeds, making it crucial for modern automated textile factories to improve both output and quality.