Question

In case of reeves variator in a sizing machine, it is necessary to

• A. adjust the tension of warp
• B. reset after each set length
• C. clean after each set length
• D. submerge in oil bath

Hint:

• Reeves variator A mechanical CVT for speed control.
• In sizing, it can control the weaver's beam winding speed.
• As the beam fills, its diameter increases, and the variator setting is adjusted (manually or automatically) to maintain desired winding conditions.
• When a new empty beam is started (after a "set length" or full beam), the variator must be reset} to the correct speed setting for the initial small diameter of the empty beam.

Answer 1

The Correct Option is B

Reeves Variator in a Sizing Machine

A reeves variator is a mechanical device used in sizing machines to adjust the speed and tension of the warp yarns during the sizing process. It helps maintain consistent tension and speed of the yarns as they move through the machine, which is crucial for uniform sizing and optimal fabric quality.

Let’s examine each option:

1. Adjust the Tension of Warp

Adjusting the tension of warp is indeed an important function of the reeves variator. However, this option is not the most accurate answer to the specific requirement. While the variator does affect tension, the main focus is on its ability to adjust the system after every cycle rather than continually adjusting the tension.

2. Reset After Each Set Length

Resetting after each set length is the correct answer. The reeves variator needs to be reset after each set length of yarn is processed. This ensures that the system remains calibrated and adjusts properly as the warp yarn moves through the machine. By resetting, the machine can ensure that the variator continues to work efficiently across different set lengths of yarn.

3. Clean After Each Set Length

Cleaning after each set length is not a necessary function specific to the reeves variator. Although maintenance is important, cleaning is not required after every set length for the proper functioning of the variator.

4. Submerge in Oil Bath

Submerging in an oil bath is not a typical requirement for the reeves variator. While lubrication is important for some machine components to reduce friction, the variator itself doesn’t necessarily need to be submerged in an oil bath for regular operation.

Why Reset After Each Set Length is the Correct Answer

The reeves variator’s primary function in a sizing machine is to maintain consistent tension and speed. It needs to be reset after each set length to ensure it functions correctly with the next cycle. This reset ensures the system remains precise throughout the sizing process.

Why Not the Other Options?

• Adjust the Tension of Warp: While the variator does affect warp tension, the reset is more crucial to maintaining accurate operation after each set length.
• Clean After Each Set Length: Cleaning is important for general maintenance but not specific to the variator’s function after each set length.
• Submerge in Oil Bath: Lubrication may be necessary, but submerging in an oil bath is not a regular requirement for the variator.

A Simple Way to Remember

Think of the reeves variator like a reset button that helps recalibrate the system after each set length of yarn. This is why the variator must be reset after each set length.

Final Answer

The correct action for the reeves variator in a sizing machine is to reset after each set length.