Feed-off-arm type sewing machine for flat seaming

A feed-off-arm type sewing machine for flat seaming, comprising:

• a needle bar which is supported so as to move up and down, in a head unit arranged adjacent to an end portion of a sewing machine arm which incorporates a sewing machine main shaft;
• a rotating member which is supported so as to rotate about a vertical axis;
• a swinging lever which is supported inside said sewing machine arm, and extends in said head unit, a tip portion of which being connected with said needle bar;
• an actuating rod which extends from said sewing machine arm into said head unit, a tip portion of which being connected with said rotating member;
• and
• a shielding member which has a first sealing part for sealing a portion of said swinging lever and a second sealing part for sealing a portion of said actuating rod, and thus shields fluid-tightly said sewing machine arm and said head unit from each other,
• wherein said needle bar is moved up and down by swing of said swinging lever caused by transmission from said sewing machine main shaft,
• said rotating member is rotated by movement of said actuating rod in an axial direction thereof caused by transmission from said sewing machine main shaft, and
• the inside of said sewing machine arm is oil-lubricated, and the inside of said head unit is grease-lubricated.