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Maintenance of double-needle zigzag sewing machine

The double-needle zigzag sewing machine is a relatively simple pattern machine, which is widely used for decorative sewing in clothing, shoes and hats, underwear, gloves, leather, luggage and other industries. This machine is characterized by double-needle swing sewing, single-rotating shuttle hook and poor loop formation, which brings great challenges to maintenance and debugging.

Next, taking ZOJE 457D double-needle zigzag sewing machine as an example, the author introduces some simple maintenance methods of double-needle zigzag sewing machine to readers, combining with his years of practical experience.

The most common faults of double-needle zigzag sewing machine are thread rolling, needle jumping, needle point hairiness, etc.

line rolling fault

when the new equipment is just used, the line rolling phenomenon can be said to be very common. Because users usually sew with silk rays slightly thicker than ordinary sewing thread when using the equipment, in order to enhance the decorative effect, in addition, the equipment runs with two needles at the same time (that is to say, two silk rays pass through the rotating shuttle at the same time), and the fit gap of the new rotating shuttle is usually very tight, so the thread rolling failure sometimes occurs. In this regard, I suggest that maintenance workers or operators use grinding sand for grinding treatment, and grinding the gap of the rotary shuttle slightly larger will make it less prone to line rolling; Or we can change the shuttle frame of the old and new rotating shuttle, and the effect is good.

needle jumping fault

in addition, needle jumping phenomenon of double-needle zigzag sewing machine is also common. Because there is a great time difference in hooking when the needle of the double-needle zigzag sewing machine swings to the left and right limit positions, it puts forward high technical requirements for debugging. Generally speaking, in the actual maintenance, we will take the hook position of the hook tip of the left machine needle at the upper limit of the needle hole as the best, and at the same time, we should also take into account that the right machine needle has at least 1.5mm rebound when the right machine needle picks up at the right limit.

Of course, when sewing special fabrics, we can consider adjusting the gap between the left needle and the hook tip to be tangent, and adjusting the matching gap of the right needle to be slightly collided, which can make up for the difficulty in hooking the thread caused by the small loop.

It is worth mentioning that when I contacted many similar machines, I found that the rotary shuttle drive gears of the double-needle zigzag sewing machine are all spur gears, while many of the 2U series single-needle zigzag sewing machines are driven by differential gears, which can make up for the time difference of hooking and ensure the sewing performance is stable. Therefore, I suggest that enterprises should also adopt differential mechanism drive on the ZOJE 457D machine.

Needle tip hairiness fault

As for the needle tip hairiness fault, the author thinks that this fault is mainly caused by the randomly used bobbin, and it is suggested that enterprises should use the bobbin on ordinary embroidery machines of Feiren brand and Meijia brand. Because the outer circular edge of this bobbin is not easy to collide with the needle tip, the use effect is better. In addition, if the threading steel wire on the bobbin sleeve is deformed and bent inward, it is also easy to touch the needle tip, which will lead to needle breakage in serious cases, so we must pay attention to it.

It is worth noting that any equipment can meet the needs of different users as long as it is flexibly debugged on the premise of mastering the principle, and the double-needle zigzag sewing machine is no exception. As long as we flexibly adjust the cloth feeding time and the needle swinging time, we can adjust the triangular needles with completely different shapes. For example, when the needle swing time is adjusted until the needle is about to leave the sewing material but not completely, the needle will start to swing, so that the shape of the triangular needle is different from that of the standard swing needle.