*doffer*

n. 1. (Mach.) A revolving cylinder, or a vibrating bar, with teeth, in a carding machine, which doffs, or strips off, the fiber from the cards. [ Webster 1913 Suppl. ]

2. (Spinning) A worker who replaces full bobbins by empty ones on the throstle or ring frames. [ Webster 1913 Suppl. ]