The invention provides an anti-
nest thread trimming device and method and a
sewing machine, and relates to the technical field of sewing machines, the anti-
nest thread trimming device comprises a
machine needle and a driving cutter, the driving cutter is arranged below a sewing material, and the
machine needle is movably arranged between the upper portion and the lower portion of the sewing material; the driving cutter is provided with a thread passing hole, a first
cutting edge and a first thread clamping part; the driving cutter is provided with a first position for the
machine needle to penetrate through the thread passing hole to conduct first needle sewing and a second position for the machine needle and the driving cutter to be staggered to conduct follow-up sewing. The auxiliary moving cutter is provided with a second
cutting edge; after first needle sewing is completed, the machine needle moves to the side, away from the thread passing hole, of the sewing material, and the first thread clamping part and the side, provided with the second blade, of the auxiliary movable cutter clamp the upper thread; after at least second needle sewing is completed, the auxiliary moving cutter moves to the position where the second
cutting edge is in
butt joint with the first cutting edge so as to
cut off the upper thread. By means of the technical scheme, the problem that
nest-shaped thread ends are likely to be generated in the thread trimming process of a
sewing machine in the prior art can be effectively solved.