A robotic sewing assembly is provided and includes a sewing head body, an upper arm, a motor and a lower arm. The upper arm is attachable to the sewing head body and includes a sewing needle oriented along a first axis. The lower arm is rotatably attachable to the sewing head body to be rotatable about a second axis defined transversely with respect to the first axis by the motor. The lower arm includes a stitch plate, a butterfly looper and first and second drivetrains. The first drivetrain is extendable through the lower arm and configured to maintain a position of the stitch plate during lower arm rotation. The second drivetrain is extendable through the lower arm and configured to drive the butterfly looper during the lower arm rotation.

A sewing machine frame includes a pillar frame and an extending frame. The extending frame extends from one end in a longitudinal direction of the pillar frame, in an extending direction orthogonal to the longitudinal direction. The extending frame includes a first extending plate, a second extending plate, and an extending intermediate plate. The first extending plate extends in the extending direction. The second extending plate is separated from the first extending plate in the longitudinal direction. The second extending plate faces the first extending plate and extends in the extending direction. The extending intermediate plate extends in the longitudinal direction and the extending direction. The extending intermediate plate couples the first extending plate and the second extending plate in the longitudinal direction, and the extending intermediate plate has a curved surface.

A sewing machine frame includes a pillar frame and an extending frame. The extending frame extends from one end in a longitudinal direction of the pillar frame, in an extending direction orthogonal to the longitudinal direction. The extending frame includes a first extending plate, a second extending plate, and an extending intermediate plate. The first extending plate extends in the extending direction. The second extending plate is separated from the first extending plate in the longitudinal direction. The second extending plate faces the first extending plate and extends in the extending direction. The extending intermediate plate extends in the longitudinal direction and the extending direction. The extending intermediate plate couples the first extending plate and the second extending plate in the longitudinal direction, and the extending intermediate plate has a curved surface.