The alternating presser foot mechanism prevents stitch bunching and skipped stitches on thick, multi-layered or slippery materials — essential for denim, canvas, artificial leather and outerwear.

SP-845D (4 mm gauge) for medium-weight twin-stitch lines; SP-875D (7 mm gauge) for wide parallel stitching on jeans, bags and heavy garments.

Powerful servo motor sustains consistent speed through thick seam crossings and multi-layer intersections without stalling or skipping.

Simultaneous automatic trim of both needle threads at seam end — efficient on heavy fabrics where manual scissor cutting is slow and fatiguing.

Left and right needle tension adjusted independently — critical for even stitch appearance when sewing at the full gauge width on heavy materials.

Automatic back-tack at seam start and end programmed via touchscreen — delivers consistent seam security on heavy-duty garments without operator variation.