Introduction:

The Pirn winding machine is used for winding yarn onto a Pirn. It is used in textile mills for preparing yarn for weaving or knitting. The speed at which the yarn is wound onto the Pirn, known as the winding speed, and the speed at which the Pirn moves back and forth during winding, known as the traversing speed, are critical parameters for achieving good quality yarn. In this lab manual, we will learn how to calculate these two speeds.

Equipment Required:

- Pirn Winding Machine
- Stopwatch
- Tape Measure
- Yarn

Procedure:

- First, we need to calculate the winding speed. To do this, we need to measure the length of yarn wound on the Pirn and the time taken to wind it.
- Attach the yarn to the Pirn and start the winding machine.
- Use a stopwatch to measure the time taken to wind a specific length of yarn. Let’s say we wind 50 meters of yarn. Start the stopwatch when the winding starts and stop it when the 50 meters of yarn have been wound.
- Note down the time taken to wind 50 meters of yarn. Let’s say it took 10 minutes.
- Now, we need to calculate the winding speed. The winding speed is given by the formula:

Winding speed = Length of yarn wound / Time taken

In our example, the length of yarn wound is 50 meters, and the time taken is 10 minutes. So, the winding speed is:

Winding speed = 50 / 10 = 5 meters per minute

- Next, we need to calculate the traversing speed. To do this, we need to measure the distance traveled by the Pirn during one complete traverse and the time taken for one complete traverse.
- Attach the yarn to the Pirn and start the winding machine.
- Use a tape measure to measure the distance traveled by the Pirn during one complete traverse. Let’s say the distance is 20 centimeters.
- Use a stopwatch to measure the time taken for one complete traverse. Start the stopwatch when the Pirn starts moving and stop it when it completes one full traverse.
- Note down the time taken for one complete traverse. Let’s say it took 10 seconds.
- Now, we need to calculate the traversing speed. The traversing speed is given by the formula:

Traversing speed = Distance traveled / Time taken

In our example, the distance traveled is 20 centimeters, and the time taken is 10 seconds. So, the traversing speed is:

Traversing speed = 20 / 10 = 2 centimeters per second

Conclusion:

In this lab manual, we learned how to calculate the winding speed and traversing speed of a Pirn winding machine. These two speeds are critical for achieving good quality yarn, and by calculating them accurately, we can optimize the performance of the Pirn winding machine.