Why overlock stitches are skipping on fabric

The old machine is not sewing. The sewing machine does not stitch, does not stitch, does not sew. How to sew knit fabrics on a regular sewing machine

Sewing machine malfunctions can be detected by external signs. For example, skipped stitches appeared, or the upper thread began to loop at the bottom, or the sewing machine began to “knock” during operation. Suddenly the fabric doesn’t move smoothly or the needle breaks often, etc.д. It is much more difficult to determine the cause of the faults that have appeared and even more difficult to fix them, to perform sewing machine repair with your own hands.

In this video, you’ll learn the cause of a costly sewing machine repair caused by a broken toothed drive belt. You will also learn tips on how to avoid this sewing machine malfunction.

To make it easier for you to find the breakdown, we offer a brief overview of the main faults and causes, as well as a selection of articles on the site devoted to these issues. But before we understand why the sewing machine or overlock does not sew or sews poorly, you need to make sure that the model sewing machine is used in accordance with its specifications, including the exception of the use of materials, fabrics, threads, needles not specified in the passport or instructions of the manufacturer. Assume also that the threading is correct and that other elementary requirements are met, such as the seamstress not pulling the fabric toward you by hand, etc.п.

How to sew knitwear?

If the machine does not sew knitwear, you need to do the following:

  • Get a special sewing needle. On what needle you will sew knitwear depends a lot. Special needles are also called. knitting needles. Their peculiarity is the rounded tip, which does not pierce the fabric, but expands the fibers. When sewing knitwear needles can cause defects.
  • Using the upper conveyor belt for a sewing machine. This is a special device having the form of a plate, which contributes to the uniform movement of the material. Conveyor is installed over the needle plate. It is needed in cases where the foot strongly displaces sewn details. Knitwear is very stretchy, and therefore without the use of aids in some cases can not do.
  • Smooth the flow of the material can be by means of paper sheets. They are placed under the bottom fabric and under the foot. After joining the parts at the seams is carefully trimmed and removed.
  • Buy polyester filaments. What kind of thread is used determines the quality of the stitch and its durability. Luckily, polyester thread is the most common thread for sewing machines, so it’s not hard to buy.

Whichever of the above options you choose, it is initially recommended to stitch on a small piece of material. Prefold it in half. This method will allow you to adjust the sewing machine by adjusting the thread tension, stitch length, etc. д.

Causes of increased clearance between the needle and the hook

Some of the main reasons why the distance between the hook and the needle increases are the following:

  • Incorrect needle settings. Sewing machine. a complex device, so the needle in it is much different from the usual manual. over, the needle for a Merrylock machine is unlikely to fit an Astralux or Jaguar. The point is that the shape of the blade, its length, and the shape of the bulb vary from model to model. If you decide to experiment, and used a needle from one machine for another, be prepared for unpleasant consequences.
  • A blunted blade. How often to change needles depends on how often and how much you sew. If you use the same needle for a long time, the blade becomes blunt, begins to tear the fabric, the stitches become sloppy. In addition, due to metal abrasion, the gap also increases.
  • Failure of parts, due to vibrations created by a swinging vertical hook. Their deformation and displacement gradually increase the gap.

In addition to the increased gap, there are other reasons why the stitching does not form properly.

What to do as a prophylactic to prevent a sewing device from skipping stitches?

You should only use high-quality devices and follow the manufacturer’s advice as described in the user’s manual. over, it is essential to occasionally clean the working elements of settling dust, dirt, combing and lint materials, because they often play the role of abrasive and increase the wear of rubbing nodes. Continuous lubrication of the overlock can reduce the possibility of overheating or damage to parts during operation.

To care was very productive, you need to choose high-quality machine oil, also follow the correct dosage of lubricants. all this is described in the instructions to the equipment. Lack of oil increases the load and excess oil can drip down, contaminating the material. It is recommended to choose the original oil, and adhere to the exact frequency of preventive maintenance. If you forget about them, overlock not only will skip stitches, and exhibit other difficulties in operation.

To avoid problems with the stringing, it is necessary to inspect the settings of the overlocker before each introduction. After running a small piece of fabric through the device, it is important to inspect the workpiece. When you see wrinkled fabric, check the needle thread tension and, if necessary, you can loosen it by adjusting the value on the knob.

How to solve a skipped stitch problem

The overcasting machine does not always produce good stitches. Missing stitches and other imperfections can occur. There are several likely causes of skipped stitching.

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The needle may be dull, bent, or misplaced. This is indicated by a dull thumping noise when sewing. Missing stitches can occur when using a needle that is not the correct number for the overlock. Needle must be removed and inspected with a magnifying glass to check for defects. Set in the correct position. If the needle is defective or does not match the number, it should be replaced.

Incorrect threading and tension is another cause of poor seam quality with skipped stitches. You should check the passage of the thread through the bindings and adjust the tension, and make sure there is no winding of the thread on the stitch adjustment pin.

A poorly pressed foot is another cause of skips in the overlapping of the edges. You need to increase the strength of the presser.

After eliminating the cause of poor workmanship, it is recommended to check the result on a scrap of fabric. If everything is in order, you can proceed to the main work. Otherwise, you’ll have to call a troubleshooter to fix the machine.

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Overlock settings and repair with their own hands.

Overlock, even domestic is much more complicated than sewing machines and to adjust it, moreover, to perform overlock repair without special knowledge and skills, it is almost impossible. However, overlock repair or adjustment is not always required, sometimes it is sufficient to adjust the thread tension, and it will overlock the fabric well again. Some overlocks are very sensitive to the setting of the thread, and when switching to a different quality thread, you have to readjust their tension.

Some manuals provide overlock repairs, adjustments, and give parameters for setting buttonholes and needles if these gaps fail or replace the buttonholes. As a rule, they are indicative, ideal. Master, performing overlock repairs have to expertly bring them to the right value, so this type of repair is recommended to do a professional.

All our recommendations in overlock repair are generalized and will fit any overlock model, but don’t forget to read the manual for your model, where you can find information about settings, lubrication, type of needles, and more.

Missing and thudding. dull or bent needle

If you experience skips or a dull thumping noise. it is most likely a dull or bent needle.

Needle point defects: a. a blunt point; b. A warped point; c. normal needle point.

A blunt needle can cause many problems. Overlock needle is a very important part, its condition affects a lot of parameters, in particular the gap between the needle and the buttonhole. The key to making a seamless overcasting stitch. A blunt needle can be identified by running the right thumb nail along the needle from bulb to end. The nail will certainly reveal a bent spot on the point. You can use a magnifying glass for inspection.

If the needle is bent, do not try to straighten it, overlock settings are very precise and do not allow for such needles. To check the condition of the needle, place it flat on a flat surface.

overlock, stitches, skipping, fabric

Inspect the needle from the top and sides: 1. parallel to the clearance. 2. A flat surface (glass, etc.).п.)

Only use factory-recommended needles for your overlock machine

overlock, stitches, skipping, fabric

Pay special attention to what type of needle is installed in your overlocker. Prerequisite. Only use the needles recommended by the manufacturer.

In addition to the fact that needles can be with a round or sawed-off bulb, they can also differ in the length and thickness of the bulb, the length of the needle itself and other parameters. If your overlocker uses round-bulb needles, you must replace them with a needle with the same thickness and length of the bulb. The sizes and types of needles used are listed in the manual, and sometimes they are on a sticker inside the overlocker. It is best to write down the type of needle on a small piece of paper and tape it to the body with clear tape. In any household overlock machine, the needle is installed with a long groove. on itself, or with a sawed-off part of the bulb. away from yourself. Make sure to install the needle all the way in, and if you have two needles, they are offset (one higher than the other).

overlock, stitches, skipping, fabric

After a long run, the buttonhole and other accessible areas should be cleaned of trimmings, shavings, etc.п., preferably with a stiff hair brush (for glue).

The thickness and elasticity of overlock thread play an important role

Overlock threads are very important for overlock seams. If you use different quality or thickness threads. This immediately affects the tension and therefore the stitching pattern. Overlocks are very sensitive to tension, and the slightest change in one thread can affect all the others. It is ideal to use threads of the same brand, changing colors only. But in practice this rarely happens, so when changing threads to a different type or thickness, we recommend loosening all tensioners and at the slowest stroke, gradually increasing the tension of each thread, periodically checking which thread, and by how much, to tighten. Sometimes, when adjusting an overlock stitch, you can use different colored threads for clarity in adjusting the tension of each, and then set the necessary.

overlock, stitches, skipping, fabric

Try not to use x-rays or thicker threads. The thinner and more elastic the thread, the easier it passes through the overstitched fabric, needles, buttonholes, and the better the quality of the stitching.

Greasing the overlock should be paid more attention to than to the sewing machine

Lubricate overlock machines at least every six months, or once a month with heavy use. It is advisable to use a syringe instead of a grease gun. Always use a long needle to reach hard-to-reach places and use less oil. Excess oil around the needle can ruin the fabric. Try to carefully lubricate knots that have contact with the fabric. There is a lubrication schedule in the manual, but a rule of thumb is to. Lubricate all accessible points where metal friction is present, even if not specified by the factory. In order to thoroughly lubricate all units of the overlock, sometimes you need to remove the protective covers of the housing, but if they are difficult to remove, you can do with the factory marks for lubrication. Grease overlock should be given more attention than the sewing machine, as overlock works at higher speeds and lack of lubrication in some nodes leads to their overheating and even jamming.

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A list of the main faults of overlock machines:

The fabric does not move: the pressure of the presser foot is too weak. If the fabric is too thin, the pressure must be reduced, otherwise the fabric will gather. Increase presser foot pressure when sewing thick fabrics. Generally the presser foot pressure should not be changed unless clearly necessary.

Formation of loop-hole on the opposite side of the needle

This phenomenon is widespread in mechanisms that use coated threads. Their elasticity is several times greater than that of non-grained yarns. Since most manufacturers focus on the use of non-glossy materials, the device may malfunction.

For the elimination of the need to achieve an optimal angle of deflection of the filament. In an extreme case, you can slightly increase the stroke of the shuttle, creating an elevation on its body. Tin applied with a soldering iron is used for this purpose. Solder it in the opposite direction of the needle, leaving 0.8 millimeter gap between the elevation and the needle. Also changing the thread to a higher quality thread can help.

Sewing machine repair

Of course, many of the above-mentioned problems you can try to fix by yourself, especially if you have been sewing for a long time and know how your machine works. But there are problems that are categorically not recommended to fix with their own hands. In order to repair a malfunctioning appliance, it is better to contact a proven service center.

Repairano’s specialists will promptly repair any malfunctions of any nature:

  • Check the settings of the device and, if necessary, restore them.
  • Diagnose the device, find the faulty part and replace it.
  • Perform cleaning and lubrication of the sewing machine.

for our services are quite reasonable and the result exceeds all expectations: fast, high quality and, what’s important, at a convenient time for you.

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