1-needle, Unison-feed, Long Arm Lockstitch Machine with Large Hook DNU-261H With its generous 635mm of free space under the arm and powerful unison-feed, the machine delivers outstanding productivity when sewing tents and sheets.   The machine head structure is designed to improve operability. With the wide 635mm of free space under the arm, a large material can be sewn while spread over the bed. The presser foot goes up as high as 15mm to ensure easy placements/removal of extra heavy materials. Consistent seam quality. With its unison-feed mechanism that ensures a smooth and steady feed of materials, the machine provides consistent seam quality with no material slippage. Increased alternating vertical movement of the walking foot and presser foot. The alternating vertical movement of the walking foot and presser foot can be widely adjusted in the range of 3 to 6mm. With this feature, the machine is able to flexibly adapt to various kinds of heavy materials. Simple adjustment of normal/reverse stitch length. Stitch length is adjustable by up to 8mm with a stitch dial. The stitch length is also adjustable for reverse-feed stitching.   The frequency of bobbin thread replacement is reduced. Since the machine incorporates a horizontal-axis double-capacity hook, the frequency of bobbin thread replacement is reduced, further increasing efficiency.