VDQ Pulley/Adjustable Pulley

A VDQ (Variable Diameter Quality) Pulley is a specialized component used in circular knitting machines to control yarn tension and speed during the knitting process. The VDQ Pulley is designed with a variable diameter that can change as the yarn passes through it. By adjusting the size of the pulley, operators can control the tension and speed of the yarn, which in turn influences the knitting process and the characteristics of the resulting fabric.

The primary function of the VDQ Pulley is to ensure consistent and precise yarn tension, which is crucial for producing high-quality knitted fabrics. By controlling the tension and speed, knitting machine operators can achieve the desired fabric properties, such as fabric density, thickness, and appearance. The VDQ Pulley plays a vital role in optimizing the knitting process and producing fabrics with specific characteristics to meet various knitting applications and customer preferences.

The main function of the VDQ (Variable Diameter Quality) Pulley in a circular knitting machine includes the following:

  1. Control Yarn Supply: The VDQ Pulley is responsible for regulating the supply of yarn to the knitting machine. By adjusting its diameter, the pulley controls the amount of yarn being fed into the machine during the knitting process.
  2. Control Yarn Tension: The VDQ Pulley plays a crucial role in controlling the tension of the yarn. The adjustable diameter allows operators to set the desired tension, ensuring proper and consistent tension on the yarn during knitting.
  3. Control Stitch Length: By adjusting the size of the pulley, operators can control the stitch length in the knitted fabric. A larger diameter results in longer stitches, while a smaller diameter produces shorter stitches.
  4. Control GSM (Grams per Square Meter): The VDQ Pulley’s control over yarn supply, tension, and stitch length directly influences the fabric’s GSM. By adjusting the pulley, operators can achieve the desired fabric density and thickness, thus controlling the GSM of the knitted fabric.

The VDQ (Variable Diameter Quality) Pulley works by allowing the operator to adjust its size, which in turn controls the tension and speed of the yarn in a circular knitting machine. This adjustment directly affects the properties and appearance of the fabric being produced.

VDQ Pulley gets the motion from the toothed belt.

Here’s how the VDQ Pulley works:

  1. Adjustable Size: The VDQ Pulley is designed with an adjustable diameter. It has a nut or screw that can be loosened to change the diameter-controlling parts.
  2. Tension and Speed Control: By adjusting the size of the pulley, the operator can control the tension and speed of the yarn. A larger diameter results in lower tension and slower yarn feeding, while a smaller diameter increases tension and speeds up yarn feeding.
  3. Impact on Stitch Length: The change in diameter of the VDQ Pulley directly affects the stitch length in the fabric. When the pulley diameter is increased (rotating in the ‘+’ direction), the stitch length also increases, leading to looser stitches. Conversely, decreasing the diameter (rotating in the ‘-‘ direction) results in shorter stitch length and tighter stitches.
  4. Controlling Fabric Properties: By adjusting the VDQ Pulley, the operator can fine-tune the knitting process to achieve the desired fabric properties, such as fabric density, thickness, and appearance. This control is crucial for producing fabrics with specific characteristics for different applications and customer preferences.
  • When the VDQ (Variable Diameter Quality) pulley diameter decreases, it impacts several aspects of the knitting process, leading to specific changes in the resulting fabric:
  1. Positive Feeder Speed Decrease: Decreasing the VDQ pulley diameter causes the feeder speed (the rate at which yarn is supplied to the knitting machine) to decrease. This results in a lower rate of yarn delivery to the needles.
  2. Less Amount of Yarn to Needle: With a lower feeder speed, the needles receive a smaller amount of yarn for each stitch. This leads to reduced yarn consumption during the knitting process.
  3. Smaller Loops: The decreased amount of yarn supplied to the needles results in smaller loops being formed in the fabric. This affects the stitch length, with the loops becoming shorter.
  4. Increased GSM: As the loops become smaller and the stitch length decreases, less yarn is distributed over the same area of the fabric. This results in an increase in the GSM (Grams per Square Meter) of the knitted fabric. A higher GSM indicates a fabric that is denser and heavier in weight.
  • When the VDQ (Variable Diameter Quality) pulley diameter increases, it affects various aspects of the knitting process, leading to specific changes in the resulting fabric:
  1. Positive Feeder Speed Increase: Increasing the VDQ pulley diameter causes the feeder speed (the speed at which the yarn is supplied to the knitting machine) to increase. This results in a higher rate of yarn delivery to the needles.
  2. A Large Amount of Yarn to Needle: With a higher feeder speed, the needles receive a larger amount of yarn for each stitch. This leads to more yarn being fed to the needles during the knitting process.
  3. Larger Loops: The increased amount of yarn supplied to the needles results in larger loops being formed in the fabric. This affects the stitch length, with the loops becoming longer.
  4. Decreased GSM: As the loops become larger and the stitch length increases, more yarn is distributed over the same area of the fabric. This results in a decrease in the GSM (Grams per Square Meter) of the knitted fabric. A lower GSM indicates a fabric that is less dense and lighter in weight.

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