Tend machines that wind threads onto shuttle bobbins.
What does a Sewing Machine Bobbin Winder do?
Tends machine with multiple winding units that wind thread onto shuttle bobbins for use on sewing machines: Places empty tube on spindle of winding unit, wraps ends of thread around tube, and cuts off excess thread. Pushes lever to start winding unit which automatically stops when thread breaks or tubes are full. Cuts thread with scissors and removes tube. Removes and discards partially wound bobbins. Measures bobbin periodically, using gauge and turns screws to adjust tension if bobbin is not of specified size.