A drum-driven winder is fitted with a 3-diamond drum. The number of revolutions of the drum for single traverse is .................
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- The number of revolutions in a drum-driven winder depends on the number of diamonds on the drum. For a 3-diamond drum, it takes 3 revolutions for a single traverse.
For a 3-diamond drum, the number of revolutions required for a single traverse is equal to the number of diamonds on the drum. A 3-diamond drum will require 3 revolutions for a single traverse.
Final Answer: The number of revolutions is \( \boxed{3} \).