Patent ID: 8028635

Claim:
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.