Like any device (even without electronic control), the sewing machine sooner or later passes the stitches. Such a problem is found quite often, but it’s not so difficult to eliminate this problem. Why the unit can pass stitches when sewing and what to do?
How stitches are formed?
The string flashing with a thread for fastening different parts of the tissue is generated during the well-coordinated operation of the needle and shuttle. The front end of the shuttle device rushes towards the needle and pulls a thread loop with it. Then the shuttle winds around itself the upper thread and forms stitch. The stapler based on the shuttle is so arranged that with an accurate stitch fit, it will not be missed. But over time, the details are soldered, some of them begins to see, get deeper than conceived, and the sewing machine begins to skip stitches – First, rarely and “pieces”, then significantly “false” seam.
In fact, the distance between the edge of the needle and the shuttle is approximately 2 mm. For thin tissues it is less than 2 mm, for thick – a little more. If you are not quite sure which the gap will be perfect – set less (1.5 mm, for example), but not vice versa. A greater clearance does not give a shuttle to capture the thread, and it flies away from the needle.
The setting depends on the stitch mode: so, for a zigzag seam, the setting is performed in the extreme left and the same needle position. Before starting the machine, you always check the correctness of the clamping roller, the seam mode and the gap itself.
The main causes of skips
Although fixing the work of the sewing machine with the passage of stitches will be able to quickly and effectively in the workshop specializing in the repair of such equipment, the simplest steps in the search for a fault user does and independently. The most common reasons for passing stitches when sewing similar to sewing machines of all generations – Although Zinger, at least in modern models, including Chinese.
If we are talking about firmware by type Zigzag, first of all check, did not get lost and the needle did not bother. “Professional disease” is characterized by novice, forgetting to change the needle during the transition, for example, with a fleece for a tarpaulin. If the needle fastened so much that it is not able to pierce the matter without having having it at the point of the hole, and also if microcracks could appear – immediately change it.
“Wrong” needle when sewing a particular material – a consequence of the forgetfulness or inexperience of a beginner working. Despite the labeling, externally, many sizes needles are extremely similar. So, for knitwear, several blisted needles are used, which are not spanning and not spoiling the adjacent fibers of matter, but spreading it. An attempt to apply too acute needle can lead to the twisting of individual fibers, near the seam fabric is faster and will give a stretch.
Each needle has a planting flask inserted into the “legs” clamp making reciprocal movements. If you insert a round needle in this clamp instead of cut (or vice versa), then “aiming” in the gap, where it passes when performing each stitch, will change somewhat. In general, the mechanism will cease to work with the accuracy on which it is originally designed.
- At best, the machine will sew inaccurately. Stitches will be crypaered, offset one and the same vector.
- More often the machine will pass stitches – single or groups.
- If the needle hurts greatly for the clamping leg or shuttle – She will immediately break, and the mechanism of deceive cars, not being quite powerful, will receive noticeable damage.
The manufacturer indicates the instructions and on the body of the machine sizes of the needle – if the machine is not designed for sewing thick tissues. Most machines are equipped with double, not single (like most ultra-compact and portable) stapler. The upper thread in them is served with a bobbin or coil from above, the lower – from the coil or bobbins from the bottom hidden under the paw. Thin thread should not be refueling into a thick needle. It should not be too rigid – like, for example, Soviet cotton threads.
It is better to use, for example, Capron Option, which retains the integrity of weaving, not twisted when passing through the needle. Also, the thread should not be twisted from the factory – otherwise it easily forms a twist, interfering with a shuttle, forms a loop. The ideal, according to consumers, the thread should be smooth, not twisted, strong enough and at the same time elastic.
In the case of nylon threads, it is possible to make it possible: stitching non-elastic fabrics can lead to stitch passages and discontinued just created seam (before the removal of the tissue from under the clamping mechanism of the machine).
Overweight-extended in the process of operation The plate for the needle – “disease” machines used not one generation. The broken hole does not give the needle to go through the matter – the one is presented in it, and the crosslinking loop is not always formed or is not formed at all. The poor promotion of matter under the clamping details can lead both to the passage of stitches and laying them on each other, which is why the intertwined seam is formed. A more complicated option – the lower layers of the fabric move faster than the upper, which is why the latter are wrinkled, the line acquires the curvature.
Several types of matter (leather and leatherette, nubuck, suede, velvet, velvet) originally can not move freely. To help promote any of these types of matter, use a special foot with additional rollers pushing these materials with a noticeable effort. Inserting another paw with Teflon layer, you can stretch out all the few layers to be stitched on our own. In the household sewing machine “Difficult” matter, it is bad to process – for this it is an industrial, professional aggregates that use a much more powerful mechanics, more massive needles and a thick chip as thread.
Necessary sliding tissue also causes stitches. Gaining big than conceived, speed, she does not give a shuttle and needle to make a standard stitch length. Uneven gliding capable completely spoil seam. All machines have spring-loaded brackets that ensure the tension of the upper thread. A response tensioner in which the thread passes with a noticeable effort leads to a passing of stitches.
If the thread is thin, and the mechanism is powerful – it simply breaks. Excessively weakened, with a provistent thread, the tensioner is able to lead to the appearance of confused stitches, confusing and “noding” of the thread. The seam will be spoiled, and the thread will break.
Methods of elimination
The curve of the line, of course, must immediately be dissolved and altered. Even when the segments of the matter are stitched reliably, but unevenly, the seam curve is left only in rare cases when it is a draft, extra. As a result, the presence of a preparing product “Made” the final layer is required. Faulty, worn needles should be replaced in time. First of all, when the machine is configured correctly, and the mechanism is working, the needle is pulled out and carefully examine it for the presence of a broken ear, jar on the edge and in its “body”, the basis. Slightly curved needle can be straightened and use it on. But significant bending and sweat is unforgivable here: the needle will continue to spoil the seam itself, and matter.
Replace hB threads on the synthetics – it is smoother. Make sure the artificial thread is used in both coils. HB threads are good only when manual sewing – and not with every cloth, but only with some kind of types, for example, everything with the same hb matter.
Check whether the clearance is correct, whether the foot is used in a particular case, whether the seam type is correct. Make sure that you do not cross the fabrics that the household stapler pushes with difficulty or does not promote them at all.
If the above reasons are eliminated, but the repeating seam curve failed to correct – urgent measures will be required: disassembling the shuster and inspection, checking it for integrity. Perhaps the drive itself is a drive – an unstable rate due to wear of one or more parts. Reducing the speed of mechanics is possible and due to the use of poor-quality lubricant, which turns over time in the dying, as a resin, stickiness. If you do not have the experience of fixing the mechanisms and devices, then the repair of the machine will require the call of the wizard.
Electronic models, which are controlled using several or more buttons from the panel (or console), the cause can be a software failure, partial or complete failure of the control board. In this case, a full diagnosis is necessary. Failure e-board can be rebuilt again – at its firmware level. Faulty is replaced by a new one – exactly the same or similar, from a compatible model of machinery.
Methods of prevention
In addition to the timely shift of worn needles, replacing the thread and checking the machine, Prevention consists in timely cleaning and lubrication of rubbing, contacting with each other details. Most often, industrial machine oil is used as a lubricant, which, in addition to sewing machines, lubricate loops, door locks, various gear mechanisms and transmissions from metal and plastic – like those that use, for example, in high standing hours.
If there is no such oil in the kit (in Soviet machines it was necessarily supplied) – you can try, for example, graphite lubricant or solidol, litol, engine oil, and the composition of WD-40 used by cyclists for lubrication of chains and stars. Do not overdo it – excess oil or lubrication at the first start splashes all the insides in the lubrication zone.
If the machine is used with a belt transmission mechanism – check the health of rubber drive belts. Stretched, cracked, “Sorted” belts need immediate replacement.
In no case do not use food oils and fats – They evaporate faster, and you soon disappear due to the lubricant of parts. Before lubricating, be sure to clean the parts from the black bending formed by the spent oil, dust and scraping with gear particles of metal powder. Do not “chase” a sewing machine for many hours and non-stop at maximum turns when crossing hard and dense tissues in a few or more layers. In addition to the engine, the rest of the mechanic can overheat, which leads to drying, the same lubricant, premature wear of parts.
Even if you have a typewriter of Soviet years in the pre-war years of release, taken from grandmother, No matter how strong steel and reliable engine, still such equipment is afraid of everyday and many hours “shock” loads. Since this is a home model for an episodic or regular, but not permanent use, it is unlikely that it will endure such a rhythm.
When the hostess (seamstress) works “superior”, daily manufacturing the elements of clothes and accessories, then it will immediately buy a semi-professional model. Such machines are close to the conditions of the “sewing” workshop and are designed for everyday, changing, and not a one-time work for half an hour – an hour every week or a month.
About what to do if the sewing machine skips stitches, look next.