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Overlock 51 class: characteristics, refueling, tuning, spare parts

Overlock 51 class can be safely called one of the most widespread varieties of sewing machines, which can be used not only for large-scale production, but also in everyday life and in small workshops. Despite the fact that such a technique is considered very old, it is very good to work with thick and rough types of fabrics. However, with modern materials this device can not cope with quality.

Overlock 51 class: technical specifications

This type of sewing machine is designed for slicing sections of knitted, linen and linen fabrics with a two-thread or three-thread seaming chain seam. In this case, the standard stitch length is usually three to six millimeters, while the thickness of the material in the harness should not exceed two and a half millimeters.

Overlock 51 class is equipped with a needle mechanism and two loopers. If you want to replace the right one with a width, then this sewing machine will use only two of the three threads.

There is also such a model as the overlock 51-A class. It is a more advanced version of this type of sewing machine. Its main difference is in the presence of a differential mechanism for the movement of tissues. Such a mechanism usually consists of two parts, due to which the materials are stretched during the working process. This mechanism will be very good at handling knitted fabrics, so be sure to keep this in mind before you make a purchase. After all, all the sutures will be very stretchy and elastic, which is very important for knitwear.

Lubrication mechanisms

Overlock 51 class - a sewing machine of industrial type. It is characterized by a centralized wick lubrication of the mechanisms that are under the platform of the product itself. In order to carry out the lubrication process, you need to find the crankcase on the bottom of the product and fill it with oil. But do not forget about the lubrication of the top of the mechanisms that are above the platform itself. Do this with a special oiler.

Three-thread overlock must be lubricated at least once a month, provided very intensive use of the product. Be sure to lubricate all parts of the machine that rub with each other during the work process. Try to constantly rotate the shaft during lubrication. Experts recommend that this process be carried out using an ordinary medical syringe. With its help it is very simple, fast and convenient.

Please note that this type of sewing machine is equipped with a mechanism for adjusting the tension of the threads, as well as the degree of pressing the presser foot on the material you are using. Also, you can independently adjust the width and length of the stitches.

Proper threading of the needle thread

Refilling the 51 class overlock is a very important process. It is from him and will depend on the correct operation of the unit. If you are planning to use a three-legged stitching stitch, then perform several actions in the order shown below:

  1. Take the thread from the reel or from the coil, located on the reel post, and to begin, draw it through the two rear holes in a special plate for the direction of the threads.
  2. Now lead it on yourself on the same plate, but under the washer regulator.
  3. Then pass the thread through the eye of the rear horn to itself on the same plate.
  4. Now start working on the left side. Lead the thread to the eye of the second horn from the thread puller.
  5. Pass the thread to the left side to the needle bar.
  6. Insert the thread into the eye of the needle directly in front of you, leaving about five centimeters under the foot.

Correct interaction of loops

In fact, it is not so easy to set up this sewing machine. Most often, a newbie can not do it. Usually one instruction is not enough, all knowledge comes with experience. For proper operation of the overlock, it is very important to adjust the proper mutual work of the needle and looper. Pay attention to the main principle of the setting: when meeting all the loopers and the needle should have the minimum possible clearances.

While the looper enters the loop, which forms slightly above the eye of the needle, the needle itself must gently enter the loop formed by the looper.

An important landmark when setting up a 51 class overlock

The left looper is the most important reference when setting up this sewing machine. While the needle will lower to the lowest position, the looper should also occupy the most extreme left position at a distance of about five millimeters from the needle. So, when the needle will go up a couple of centimeters up, a loop will begin to form, which the looper should grasp. In this case, be sure to pay attention to the gap between him and the needle. It should be no more than 0.05 mm. This gap can be set independently. To do this, you need to loosen the leftmost looper screw as much as possible, and turn it gently to the needle. It is not always possible to establish the necessary clearance on the first attempt. Do not be discouraged, such skills will come to you very soon, together with experience. After you have nevertheless established the necessary clearance, do not forget about the screw. It must necessarily be tightened.

Right looper

Now, when the left looper grips the loop, he begins to pull it along his blade. At the same time, a right looper moves toward it, which must enter the loop of the left. For properly adjusted work, the only thing that remains a needle is to remove the loop from here.

Pay attention to the distance between the point of the needle and the eye of the right looper. When they are on the same horizontal line, the distance between them should be about 0.3-0.5 mm.

It is actually much easier to configure the right looper than the left one. It does not have a special screw for adjustment, which means it will be very easy to adjust it. To do this, just gently bend it in the direction you need. Do not forget that this rule applies only to the right looper. In no case do such a fraud with the left, otherwise you risk breaking the sewing machine.

The main reasons for absences

Needles for the overlock can only have the only correct location with the loopers. Only in this case the whole unit will provide you with quality and productive work. All of the above numbers in millimeters are just the benchmarks. In fact, all products may differ slightly from each other, so the numerical parameters will be slightly different. However, in any case, all the errors will be insignificant.

Also, the numerical parameters depend on the cam. If you rotate it even one or two degrees, the position of both loopers will be slightly changed. However, in no case do not conduct such a procedure yourself. This can be done only by a specially trained master.

The most basic and common reason for missing passes can be the simultaneous upward displacement of the needle bar along with the sewing needle. Be sure to check this parameter. It often happens that even lowering the needle bar (only 0.1-0.2 mm), you can eliminate the reason for the passes.

By the way, another common cause of misses may be incorrectly matched threads for your overlock model. Take it with all responsibility to their choice, and you will not have problems with skipping stitches.

How to adjust the length of the stitch

To adjust the length of the stitch, on the overlock you need to find a rail that moves due to the eccentric. This part is adjusted with the help of several screws, which can be found in the body of the sewing machine itself. However, again, it is not recommended to conduct this procedure for a beginner. It is better to ask the master and follow his actions. And only then try to do it yourself.

Knives for overlock

Very often blunted sewing machine knives cause stitching defects. Therefore, it is necessary to sharpen them properly and in time. At home, it will not work.

For this purpose, you can contact the masters involved in the manufacture of keys. After all, they have such machines available.

A few words about belts

Usually the belt for the 51 class overlock is very long, up to several tens of years. However, the period of its use depends primarily on the frequency of the sewing machine. Perhaps, you will not have to change it very often, but you need to be able to regulate its tension.

Modern models of belts usually have special denticles, so they need to be tightened very rarely. But the models without them need more tension. Most often on the 51 class overlock you can find a smooth type of straps. However, if you have the opportunity, it is better to replace it with a serrated one.

How to properly adjust the tension of the overlock strap

Do not pull the belts too much, as this can lead to noise in the unit operation, as well as to a heavy load on the bearings. And this, in turn, will lead to a very rapid wear of parts, and the belt itself, which in time can tear.

In order to tighten the strap of the overlock, it is enough to check the tension with your finger, but only after the fastening screws have been tightened. The belt should cave in when you are doing a little effort.

There is an even simpler way to check the tension. You can implement it during the very work of the sewing machine. Correctly stretched belt will not whistle and hum.

The main disagreements between a man and a sewing machine

Nothing lasts forever, and your favorite sewing machine too. Over time, you have to change some spare parts for overlocks. Consider the main types of breakdowns, as well as the most common problems:

  1. It is very important to properly install the needle. Incorrect installation will lead to problems with looping, or to rupture of threads. Before calling the wizard, check that the needle is correctly installed.
  2. Correctly select the thread and fabric for your machine. After all, the wrong choice can lead to material damage and breakdown of your unit.
  3. If the needle plate is punched, some parts may need to be replaced. It can only be performed by a specially trained specialist.
  4. Quite rare, but still there are cases when the motor fails. This is a very serious breakdown, requiring a complete core replacement.
  5. If the rheostat of the pedal is broken, then you have to replace the whole pedal structure.

Selection of threads

Important advantages of this unit are its durability and relatively low cost. Overlock, whose price is about 8 000-10 000 thousand rubles, will serve more than one decade.

The 51 class overlock is also characterized by the fact that it can work with absolutely any thread. Even old Soviet threads will do. However, most of all he liked the cone bobbins of the thirty-fifth issue. Try on the looper for the overlock, as well as the needle to put the same thread of the same thickness. Of course, this is not necessary, but still it is desirable.

Note that for each type of thread there is a resistance, so adjust the tension of each of them separately from the others.

If you pick up the wrong tension, there is a high likelihood of missing passes, as well as a terrible appearance of the line itself.

Advantages of Overlock

Overlock, whose price is relatively low, has a huge number of advantages over other sewing machines. What is it that attracts seamstresses?

With its help, you can get the suture seams, which you can not do with a conventional machine. Sewing seams - this is a very complicated process, and the overlock manages it perfectly.

This unit works very quickly, and, most importantly, very carefully. With it, you can also create blind and decorative types of joints.

However, pay attention to the fact that with any sewing machine you need to handle very carefully, otherwise there is a chance of serious injury. But, despite the traumatic danger, the overlock is still very convenient to use. If you want this equipment to last you a long time, carefully look after it and repair it in time.

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