(1):

(n.) A revolving cylinder, or a vibrating bar, with teeth, in a carding machine, which doffs, or strips off, the fiber from the cards.

(2):

(n.) A revolving cylinder, or a vibrating bar with teeth, in a carding machine, which doffs, or strips off, the cotton from the cards.

(3):

(n.) A worker who replaces full bobbins by empty ones on the throstle or ring frames.