Doffing and donning bobbins on a ring spinning machine.

A textile mill with long, parallel rows of automated spinning frames. The floor is concrete, and the space is brightly lit by overhead industrial lights. Other workers in uniforms are visible in the same aisle, performing similar repetitive tasks on the machinery.

The person uses both hands simultaneously to reach, grasp, pull, and push. The arms move in a rhythmic, repetitive motion between the machine's spindles and a waist-high bin. The person also uses their hands to push a heavy metal trolley forward along the aisle.

Bobbins, also known as cops. These are small, tapered, cylindrical tubes made of rigid plastic. Some are empty, while others have yarn wound around them. They are handled in large quantities.

A four-wheeled metal trolley equipped with a large rectangular bin for storing and transporting bobbins. It has a horizontal handle bar for pushing.

High precision is required to align the center hole of each bobbin with the narrow vertical spindles on the spinning frame during high-speed replacement.

Parallel work. Multiple workers are stationed along the same long row of machinery, each responsible for a section, moving in the same direction to maintain the flow of the production line.

1. 011. Position the trolley bin directly in front of the active section of the spinning frame.
2. 022. Reach out with both hands to grasp full bobbins from the spindles.
3. 033. Pull the full bobbins upward to remove them from the spindles.
4. 044. Drop the collected bobbins into the trolley bin.
5. 055. Pick up empty bobbins from the bin or a side rack.
6. 066. Align and press the empty bobbins onto the empty spindles.
7. 077. Push the trolley forward to the next set of spindles once the current section is complete.
8. 088. Repeat the removal and replacement process down the entire length of the machine.