Double Blindstitch Sewing Machines

No markings due to thread tension. Highly elastic seam, invisible on both the inside and outside. The hem edge can be pressed flat. Double blind stitch sewing machine with two independently adjustable, spring-loaded feeders. The fabric is fed into the machine in an S-shape. The needle pierces once to the right and once to the left of the upper fabric edge (zig-zag stitch). The seam can be positioned any distance from the hem edge. It is highly elastic, loose, and invisible on both the inside and outside. The loose seam prevents markings from thread tension. The hem edge can be pressed flat, so it does not protrude outward. When sewing over cross seams, the feeders automatically retract downwards, ensuring that the needle only pierces the upper layer of fabric. The two fabric pressure bars act like sensors and can be adjusted for different fabric thicknesses. Result: no thread pull markings on the outside over cross seams. For...