IPC 2013 : D05B 49/04 : rotary.

IPC2013 > D > D05 > D05B > D05B 49/00 > D05B 49/04[1] > rotary.
Notes[t] D01 - D07: TEXTILES OR FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
Notes[g] D05B 43/00 - D05B 67/00: Sewing-machine elements for supplying, handling, or treating thread material
D SECTION D — TEXTILES; PAPER.
D05 SEWING; EMBROIDERING; TUFTING.
D05B SEWING (appliances for the tailoring trade A41H; sewing tables A47B 29/00; sewing in bookbinding B42B 2/00; sewing machines modified for knitting D04B 39/08).
D05B 49/00 Take-up devices, e.g. levers, for the needle thread of sewing machines.
D05B 49/04 · rotary.