Stitch-forming tool assembly for a sewing system and sewing system having such an assembly

A stitch-forming tool assembly (6) for a sewing system (1) for producing a double chain stitch seam (7),

• having a sewing needle (8) which can be driven up and down in a needle stitching direction (z) perpendicular to a material to be sewn and is designed to guide a needle thread (10),
• having a looper (12) designed to guide a looper thread (18) and for oscillating movement in an oscillating movement plane (xz) which is spanned
• by the needle stitching direction (z) and
• by a sewing direction (x) along the double chain stitch seam (7),
• wherein a path of movement of the looper (12) lies completely in the oscillating movement plane (xz) during an entire double chain stitch,
• wherein a central longitudinal axis (19) of the sewing needle (8) is spaced from a needle point (20) of the sewing needle (8) and
• wherein, when the looper (12) passes the needle point (20) during stitch formation, the central longitudinal axis (19) lies between the needle point (20) and the looper (12).