A sewing machine consists of a huge number of different parts, each of which is responsible for a specific process. Among them, it is worth noting such an important detail as a bobbin. Without it, the correct operation of the sewing machine is impossible.
Device
The bobbin for the sewing machine is a small coil, the diameter of which is within 2.5 centimeters. It is intended for winding thread. The bobbin itself is placed in the bobbin case, which many mistakenly call the bobbin. Very often it is he who causes various breakdowns. Therefore, the walls of the cap should be sufficiently smooth and even, without chips, so that the bobbin inside could spin very easily.
Many specialists put a special gasket made of thin oiled paper on the bottom of such a cap for better operation of the machine. This is done so that the bobbin can move more easily and not break the thread.
The bobbin case itself consists of a leaf spring, a small latch, a housing, a small screw, as well as an installation finger. The cap with the bobbin is installed in the holder.
Principle of operation
Such a small device, like a bobbin, is of great importance in the operation of the sewing machine. She is responsible for the quality of the line. In the case when the thread on the bobbin is wound manually, the seam may be uneven.
The operation of the bobbin is as follows. The thread that goes on top grabs the bottom thread. This is done with a complete turn of the shuttle. Then he passes the bobbin, as well as both threads, through the loop, resulting in a stitch.
Kinds
There are two types of bobbins, each of which has both advantages and disadvantages. Some are made of metal, while others are made of plastic.
- Metal bobbins most commonly used for industrial sewing machines. After all, the loads at the factories are too large, and parts made of plastic simply can not withstand them. In addition, metal bobbins look much more solid, and their service time is longer.
- Plastic bobbins more commonly used for household machines. They weigh a lot less. Some of them are transparent, which allows the seamstress to control the amount of remaining thread. In addition, the plastic bobbin moves along the cap much more easily. Another advantage is its low price. However, the plastic bobbin has several drawbacks, among which it is worth noting the appearance of notches on it as a result of grazing of its walls with a needle. This causes the thread to break. In addition, the service life of such bobbins is not very long.
How to choose?
First of all, when buying a bobbin, you need to pay attention so that it does not have chips, and its surface is smooth. Since it’s difficult to visually check its parameters, you need to take the old bobbin with you to the store. Otherwise, it may not fit the sewing machine. In addition, you need to check the bobbin in the work in the store.
In the event that the bobbin is purchased for work at home, you can purchase a plastic model. But professionals should pay attention to products made of metal.
How to refuel, insert and adjust?
Beginning seamstresses need to familiarize themselves with the basics of working with a classic sewing machine. We must learn not only to insert the bobbin into the shuttle, but also to thread the thread. However, first you need to correctly wind the thread on the bobbin. To do this, install the spool of thread on the holder located on top. This must be done so that the thread is removed from it counterclockwise.
Next, pull the thread and circle it through the tensioner, and then fasten the end of the thread directly on the bobbin. It is necessary to wind the thread several times so that it is well fixed. After this, the bobbin must be installed on a special pin. Then it must be shifted to the right side so that the bobbin for winding the thread can be fixed. At this moment, a click must necessarily sound, indicating that the bobbin is in the right place.
To start the process of winding the thread on the bobbin, you must press the pedal of the sewing machine or the desired button, if any. After several revolutions, you can stop the pedal and cut the end of the thread if it sticks out of the hole.
Then you need to continue winding. When the bobbin is fully wound, the process may stop automatically or it must be stopped by itself. After this, the bobbin must be removed from the pin, and the latch put in its previous position. The thread that goes from the spool to the bobbin must be cut so that its length is within 8-9 centimeters.
After that, you can start threading the thread that goes on top. To do this, install the spool on the pin located in the upper right side of the sewing machine. Then you need to unwind the thread from it and pull it through the thread guide, and then hold it down. Next, the thread must be pulled through the second thread guide directly into the eye of the sewing machine. The length of the tail of the thread should be at least 12 centimeters. After that, it must be held under the foot of the sewing device.
When the upper thread is threaded, it remains to do only the thread that goes from the bottom. To do this, completely remove the cover from the shuttle device, which is located directly under it. She should be removed without much effort. If you can’t do this, you need to look in the instructions on how to do this.
Some sewing machine models have another cover that protects the hook. It must also be removed.. After that, you need to insert the bobbin into the shuttle, which is located directly under the needle.
Before this, it is necessary to unwind from it 12 centimeters of thread. This length will be needed in order to pick up and stretch the thread going from top to bottom using the upper thread.
After the bobbin is inserted, pull the tail of the thread to the right. In the event that everything is done correctly, the bobbin will move in the shuttle without difficulty. After that, close the lid.
Using the handwheel located on the right side of the sewing device, pull the thread up. It must be turned several times, moving towards yourself. In this case, the edge of the upper thread must be held with the left hand. This should be done until the upper thread fully pulls the lower thread.
In the event that it was not possible to pry the thread, you must once again check the compartment where the shuttle is located. You need to make sure that the thread moves quite easily. If it moves with difficulty, this may indicate that a large amount of thread is wound around the bobbin. In this case, it is better to rewind all the excess, and then try to pull the thread one more time.
Trouble-shooting
The most typical malfunctions in the operation of the sewing machine are:
- breakage of the upper or lower thread;
- gaps in the line that occur as a result of installing a low-quality thread;
- looping stitches.
The breakage of the thread going from above may occur as a result of the bobbin case spring loosening slightly. To fix such a problem, you need to either tighten it or buy a new cap. In addition, such a malfunction may occur as a result of improper threading. In this case, just pull the thread and make the threading correctly.
The breakage of the lower thread most often occurs as a result of using a bobbin unsuitable for this sewing machine. In this case, you need to purchase a suitable part.. In addition, thread breakage can occur as a result of the screw on the bobbin case protruding too much. In this case, he grabs the bottom thread and tears it. It is still simpler here: the screw must be tightened with a screwdriver.
If the thread is not wound correctly on the bobbin, loops will appear at the bottom. To fix the problem you need to change the bobbin or just rewind it in a new way.
Very often you can see that the line winds. This can occur as a result of scraps of thread, pieces of dirt, or just scraps falling under the cap plate. In this case, it will be necessary to clean the device, as well as adjust the thread tension.
In addition, to avoid damage, it is necessary to conduct regular preventive examination. It consists in cleaning machine parts.
This can be done using a special brush that comes with the sewing machine. If she is not, then you can buy it in her special store or order it online. Using a brush, you can reach the most inaccessible places and remove dirt or scraps of thread.
In addition, before working, it is imperative to check the bobbin for chips, so that during sewing, the stitch is even and the thread does not break. Ideally, it should be even and smooth. If you are not lazy and do such routine examinations regularly, breakdowns can be avoided.
To summarize, we can say that such a small and unprepossessing at first glance detail, like a bobbin, for the proper operation of the sewing machine can be very important. After all, without her, the seamstress will not be able to make a single stitch. therefore when buying it, it is very important to choose the option that is ideal for your sewing machine.
The following is the assembly of the bobbin from the sewing machine.
