A4S
A4S
with a closed lubrication system

JACK Lockstitch A4S

Innovative automatic 1-needle lockstitch machine equipped with an integrated energy-saving motor mounted in the head, directly on the main shaft of the machine (DIRECT DRIVE system), which guarantees quiet and reliable operation and lower power consumption.

The machine does not have a typical oil sump. A small amount of oil is in a closed container to prevent it from getting dirty. This solution guarantees lower oil consumption and better lubrication of machine mechanisms.

Automatic functions: 

  • thread trimmer
  • needle positioning
  • auto bartacking option
  • sewing parameters programming
  • auto presser foot lifter

Bottom feed transport. Designed for sewing light and medium materials (A4 version) and heavy (version A4-H). The modern design of the JACK Lockstitch A4S machine provides better ventilation of the engine, what enable faster and more efficient working, as well as a longer machine life. The improved construction of the transport system and pressure a fabric, ensures the increase of the fabric thickness range.

Technical parameters: 

  • sewing speed: up to 5000 stitches / min
  • stitch length: up to 5 mm (up to 7 mm for A4-7 and A4-7H)
  • presser foot lift: 5-13 mm
  • central lubrication
  • needle system: DBx1 (A4 and A4-7), DPx5 (A4-H and A4-7H)
  • two additional function buttons located next to the needle bar
  • USB port for copying data from the machine and connecting external devices

A4S-W

“Semi-dry-head” – Oil comes to the hooks and connecting rods. In the machine head does not reach directly of needle bar and the risk of staining the material decreases considerably. Made of carbon needle bar (with increased flexibility and resistance to abrasion), does not need lubrication.

A4S-N

A4S-N has shorter thread trim (3mm) with special device to prevent bird’s nest at the beginning of sewing.

Closed Lubrication System
The machine does not have a typical oil sump. A small amount of oil is in a closed container to prevent it from getting dirty. This solution guarantees lower oil consumption and better lubrication of machine mechanisms.
Special Equipment
A4S-N has shorter thread trim (3mm) with special device to prevent bird’s nest at the beginning of sewing.
Semi-Dry-Head
In the A4S-W oil comes to the hooks and connecting rods. In the machine head does not reach directly of needle bar and the risk of staining the material decreases considerably. The needle bar is made of a special carbon alloy (with increased flexibility and resistance to abrasion), does not need lubrication.
Friendly Design
Adding stitch, backsewing and LED lamp button – everything make machine friendly.