Sewing machine having thread cutting mechanism

Details Sewing machine having thread cutting mechanism Sewing machine having thread cutting mechanism

1997-02-28

1998-07-28

Nerbun, Peter

Sewing

Elements

Thread cutting, severing or breaking

D05B 6502, D05B 1912

Patent

active

057849897

ABSTRACT:
A sewing machine capable of cutting only a needle thread without cutting a bobbin thread during the middle of stitching operation for changing the needle thread with another needle thread. A thread cutting motor is driven independent of a sewing machine motor. A rotary hook control unit is provided for controlling rotation of a rotary hook as well as driving mode of the thread cutting motor in relation to a rotation of a spindle. A thread cutting mechanism including a movable blade pivotably driven by the thread cutting motor is provided between the rotary hook and a throat plate. If the movable blade is moved from its maximum pivot position to a stand-by position, both needle thread and bobbin thread are cut at the final number of stitch. If the movable blade is moved from a needle thread cutting position to the stand-by position, only the needle thread can be cut.

REFERENCES:
patent: 4690081 (1987-09-01), Castagna et al.
patent: 5133272 (1992-07-01), Hayashi
patent: 5156506 (1992-10-01), Suzuki et al.
patent: 5623887 (1997-04-01), Tajima et al.

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