Button hole sewing machine

A buttonhole sewing machine comprising:

• a holder arm which reciprocates so as to form buttonhole seams;
• a holder plate which is connected to said holder arm and moves with said holder arm so as to form the buttonhole seams, said holder plate having a needle drop opening through which the buttonhole seams are formed;
• a support mechanism which connects said holder plate to said holder arm so that said holder plate is pivotably inclinable relative to said holder arm;
• and
• a cutting mechanism, provided on said holder plate near one end of the needle drop opening, which catches and cuts thread and braid, and wherein said support mechanism and said holder plate constitute a parallelogram linkage which includes two pairs of parallel members and four joints, and maintains a parallelogram shape even when the holder plate is inclined.

A holder device for use with a sewing machine, comprising:

• a holder plate which holds a workpiece while the sewing machine sews the workpiece;
• and
• a support mechanism, hingedly connected to said holder plate, which moves said holder plate and the workpiece relative to a needle of the sewing machine, and slants said holder plate around an edge of said holder plate when said holder plate holds an uneven portion of the workpiece, and wherein the sewing machine includes a holder arm, connected to said support mechanism, which moves the support mechanism together with said holder plate and the workpiece relative to the needle of the sewing machine, and
• wherein said edge of said holder plate includes a first edge and a second edge, and
• wherein said support mechanism includes:
• a forward link which is rotatably connected to the first edge of said holder plate and the holder arm of the sewing machine;
• and
• a backward link which is rotatably connected to the second edge of said holder plate and the holder arm of the sewing machine.

A holder device for use with a cyclic seam sewing machine, said holder device comprising:

• a holder plate which holds a workpiece while the sewing machine sews the workpiece with thread and braid;
• a support mechanism, connected to said holder plate, which moves said holder plate and the workpiece relative to a needle of the sewing machine;
• and
• a cutting mechanism which includes:
• a fixed cutter fixed on said holder plate;
• a mobile cutter, movably provided on said holder plate, which moves towards said fixed cutter to cut the thread and braid by engaging with said fixed cutter;
• and
• a wire member which rotates said mobile cutter.

A holder device for use with a cyclic seam sewing machine, said holder device comprising:

• a holder plate which holds a workpiece while the sewing machine sews the workpiece with thread and braid;
• a support mechanism, connected to said holder plate, which moves said holder plate and the workpiece relative to a needle of the sewing machine;
• and
• a cutting mechanism which includes:
• a fixed cutter fixed on said holder plate;
• a mobile cutter, supported on said holder plate, which is rotatable and engageable with said fixed cutter to cut the thread and braid;
• a capture arm, supported on said holder plate, which is rotatable to catch and lead the thread and braid toward the fixed cutter;
• and
• a spring member, fixed on said holder plate above said fixed cutter, which is engageable with said capture arm so as to fix the thread and braid caught and led by said capture arm,
• wherein said fixed cutter has a proximal portion and a distal portion, said mobile cutter and said capture arm being rotatable above the proximal portion of said fixed cutter, and said fixed cutter slanting upwardly from the proximal portion to the distal portion.