What are weft accumulator parts? How do they work?

In textile production, to ensure that weaving machines (such as air-jet looms or rapier looms) run more smoothly and faster, we need an "intermediary" to coordinate the supply of yarn. This device is the weft accumulator.

We can think of the weft accumulator as a **"yarn buffer warehouse."**  Below is a detailed description of these key weft accumulator parts and how they work together.

1️⃣ Main Parts of the Weft Accumulator (weft accumulator parts)

Power Motor: This is the "heart" of the entire device. It is responsible for driving the winding components to rotate, continuously drawing yarn from the large yarn bobbin.
Winding Disc (or Flyer): It is attached to the motor, like a constantly rotating "arm." When it rotates, it winds the yarn in a spiral onto the storage position.
Yarn Storage Drum: This is a cylindrical fixed base. The yarn wound by the winding disc is neatly arranged on this drum. Its surface is usually very smooth to ensure that the yarn does not get caught when it slides out.
Photoelectric Sensors (Eyes): There are usually two of these, one responsible for checking "if there is enough yarn," and the other for checking "if there is too much yarn." They use changes in the light beam to instruct the motor whether to accelerate or stop.
Tension Ring and Damping Pad: Located at the yarn exit. They act like "brake pads," providing a little resistance to the sliding yarn to prevent the yarn from flying too wildly and ensuring that the force entering the loom is uniform.
Unwinding Needle (Lever): For some types of weft accumulators, this small component is responsible for precisely controlling the timing of each yarn release, ensuring that the length is accurate.

2️⃣ How Do They Work?

The working process of the weft accumulator is essentially a process of **"fast storage and stable retrieval"**:
Pre-winding: When the loom is weaving, the force pulling the yarn is very strong and discontinuous. To avoid damaging the large yarn bobbin, the motor first drives the winding disc to take the yarn from the large yarn bobbin at a constant speed and neatly wind it onto the yarn storage drum. Intelligent Monitoring: When the yarn on the yarn storage drum reaches a certain level, a photoelectric sensor sends a signal to the motor to pause briefly; when the yarn is used up by the loom and the stock on the drum decreases, the sensor prompts the motor to resume work and replenish the supply.
Smooth Release: When the loom needs yarn, the yarn slides off the storage drum. At this point, the tension ring and damping plate control the yarn's movement, allowing it to flow smoothly and without tangling into the loom.

3️⃣ Why are these components necessary?

Without the precise coordination of these weft accumulator parts, the yarn can easily break during high-speed movement, or the uneven tension can lead to uneven fabric surface. With this "buffer warehouse," the large yarn cones don't need to rotate at varying speeds to match the loom's rhythm, greatly improving production efficiency.