A professional who tends slubber machines that draw out and loosely twist sliver into roving to strengthen sliver for subsequent drawing and twisting operations. Responsibilities include:

• Fastens ends of sliver from full cans to preceding ends by overlapping and twisting ends with fingers, or threads sliver over guide, through rolls and flyers, and onto bobbins.
• Patrols machines to detect exhausted ends and to observe signal lights indicating machine stoppage caused by sliver breaks.
• Pieces up broken ends by threading sliver through rollers and flyer and twisting sliver to end on bobbin.
• Doffs bobbin of roving, placing flyers on top of frame and roving in box truck.
• Sets empty bobbins on spindles, winds end of roving around bobbins, and replaces flyers.
• Brushes lint and dust from rollers and oils machine.
• May mark spools of roving with colored chalk to denote weight and texture.