Hat tipper

Wikipedia Word definitions in Wikipedia
A doffer is someone who removes ("doffs") bobbins , pirns or spindles holding spun fiber such as cotton or wool from a spinning frame and replaces them with empty ones. Historically, spinners, doffers, and sweepers each had separate tasks that were required ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Doffer \Doff"er\, n. (Mach.) A revolving cylinder, or a vibrating bar, with teeth, in a carding machine, which doffs, or strips off, the fiber from the cards. (Spinning) A worker who replaces full bobbins by empty ones on the throstle or ring frames.

Wiktionary Word definitions in Wiktionary
n. 1 (context textile manufacturing English) A revolving cylinder, or a vibrating bar with teeth, in a carding machine, which doffs, or strip off, the cotton or fiber from the cards. 2 A worker who replaces full bobbins by empty ones on the throstle or ...