• Straight buttonholing sewing machine

Computer Controlled Lockstitch Buttonholing Sewing Machines GT1790 Series

It consists of a needle bar mechanism, needle swing, looper and needle swing repositioning mechanism, thread take-up mechanism, thread hooking mechanism, fabric feeding and presser foot mechanism, speed change and positioning braking mechanism, cutter mechanism, thread trimming mechanism, thread loosening mechanism, buttonhole stitch count changing mechanism, self-locking mechanism, manual fabric feeding device, and emergency stop device. The straight buttonholing sewing machine has relatively low requirements for fabric fixation and clamping at the buttonhole area. Opening the buttonhole after the buttonhole is finished will not cause wrinkling or deformation of the fabric at the buttonhole area. The stitch is simple, and the transmission mechanism is not too complex. The stitch is formed by a combination of the needle bar's amplitude and repositioning insertion motion and the back-and-forth reciprocating feeding motion (see figure).

The stitch formation process is as follows: Feeding forward, the needle swings along the left baseline with a small stitch pitch to insert the fabric, forming a left horizontal row of buttonhole stitches.

At the limit position before feeding, the needle swings with a larger amplitude and a larger stitch pitch to insert the fabric, forming an upper looper buttonhole stitch.

The backward feeding process involves a change in needle position (from the left baseline to the right baseline) and a change in needle oscillation amplitude (from a loop stitch to a smaller horizontal stitch). This sews the needle along the right baseline, forming a right horizontal buttonhole stitch.

At the final feeding point, the needle oscillation amplitude increases again, forming a lower loop buttonhole stitch.

Two to three stitches before the buttonhole stitch ends, the cutting mechanism cuts open the buttonhole.

Straight buttonholing sewing machines are suitable for buttonhole sewing on thin and medium-thick materials, and are commonly used for shirts, underwear, work clothes, etc.

• Eyelet buttonholing sewing machine

Electronic Eyelet Buttonholing Sewing Machine 9820 Series

This machine employs a combination of a straight needle and a reciprocating curved needle, with reciprocating feeding, a compound oscillating needle holder, a dual-speed feed system, a buttonhole cutter, upper and lower thread trimming devices, and a positioning brake-all specialized structures for buttonhole sewing. Its complex mechanical structure results in aesthetically pleasing buttonholes with uniform stitches, three-dimensional buttonhole shapes, high durability, and excellent decorative effect.

The stitch formation process is as follows: The buttonhole is cut, the fabric stretching mechanism stretches the fabric, and the buttonhole trajectory mechanism controls the feed position and direction of the fabric, initiating the left horizontal row of buttonholes in a straight line.

9820 holes samples

The needle swing mechanism causes the needle to oscillate left and right, completing the chain-like buttonhole stitch.

After the left horizontal row of straight buttonholes is completed, the needle rotation mechanism, trajectory mechanism, and control mechanism work together to complete the round-head portion of the buttonhole.

The trajectory mechanism repositions the needle to the right horizontal row, performing the right horizontal row of straight buttonholes. After buttonhole sewing is completed, the machine stops with a positioning brake.eyelet buttonholing sewing machines are suitable for sewing buttonholes in medium-thick materials, and are often used in suits, coats, overcoats, etc.