Horizontal rotary hook of sewing machine

A horizontal rotary hook for a sewing machine, the horizontal rotary hook comprising:

• an inner rotary hook including an attracted member comprising a metal in an outer lower surface portion;
• a permanent magnet that attracts the inner rotary hook;
• a magnet plate accommodating the permanent magnet and provided with a mounting hole at a center of a diameter thereof;
• a non-magnetic outer rotary hook accommodating the magnet plate and including a shaft hole at a center of a diameter of an inner bottom portion thereof;
• and
• a hook supporting shaft that is inserted through the mounting hole of the magnet plate and the shaft hole of the outer rotary hook and includes, at an upper end thereof, a flange for rotatably supporting the outer rotary hook and the magnet plate,
• wherein a contact surface of the magnet plate, which comes into contact with the outer rotary hook, is a coarse surface and a surface of the flange of the hook supporting shaft is a smooth surface.

A horizontal rotary hook for a sewing machine, the horizontal rotary hook comprising:

• an inner rotary hook including an attracted member comprising a metal in an outer lower surface portion;
• a permanent magnet that attracts the inner rotary hook;
• a magnet plate accommodating the permanent magnet and provided with a mounting hole at a center of a diameter thereof;
• a non-magnetic outer rotary hook accommodating the magnet and including a shaft hole at a center of a diameter of an inner bottom portion thereof;
• and
• a hook supporting shaft that is inserted through the mounting hole of the magnet plate and the shaft hole of the outer rotary hook and includes, at an upper end thereof, a flange for rotatably supporting the outer rotary hook and the magnet plate,
• wherein a contact surface of the magnet plate, which comes into contact with the outer rotary hook, is a coarse surface and another surface of the magnet plate that faces the flange is a smooth surface.