Understanding Yarn Tensioners

Yarn tensioners are crucial components in textile machinery, responsible for maintaining a consistent and controlled tension in the yarn as it is processed. Proper tension is vital for achieving uniform fabric quality, preventing yarn breakage, and ensuring efficient operation of machines like looms or knitting machines.

Additive Type Tensioner Mechanism

The question describes a specific type of tensioner where the yarn passes between two plates: a stationary baseplate and a movable weighing plate. This setup is characteristic of an Additive type tensioner.

• Baseplate: This is the fixed plate that serves as a reference point.
• Weighing Plate: This plate rests on the baseplate or a similar support. It is designed to hold weights or apply a downward force.
• Yarn Path: The yarn is guided through a gap between these two plates.
• Tension Control: Tension is applied primarily by the weight pressing down on the weighing plate. As the yarn moves, it rubs against the plates, creating friction. The amount of weight on the weighing plate determines the magnitude of the tension applied to the yarn. If the yarn tension increases, the weighing plate might lift slightly; if it decreases, the weight pushes it down further, thus adding tension. This mechanism allows for a relatively simple and stable method of tension adjustment by changing the weights.

Comparing with Other Tensioner Types

Let's briefly consider why the other options might not fit the description:

• Electronic tensioner: These typically use sensors and electronic controls (like motors or brakes) to actively manage yarn tension, rather than relying solely on static weights and plates.
• Multiplicative type tensioner: While less common and sometimes referring to specific designs, the core idea usually involves multiplying an initial tension, often through levers or gearing, not simply adding weight via plates.
• Roller tensioner: This type uses a series of rollers (often spring-loaded) to guide the yarn and control tension, differing significantly from the plate-based mechanism described.

Therefore, the description of yarn passing through two plates, one being a baseplate and the other a weighing plate, accurately defines the Additive type tensioner.