Loop formation
The method of loop formation supported by the machine.
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Automatic. Fully automatic loop formation; the user only needs to set the length, after which the machine will independently process the edges of the future loop, without the need to switch modes manually. The most convenient and advanced option; is the automatic method that is recommended if it is planned to overcast numerous loops.
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Semi-automatic. When forming a loop in this way, work is done in 2 or 4 steps. For example, in the first case, the machine makes one short bartack and one long longitudinal line in one pass, then the mode switches and the second bartack and the second long line are performed; in the second case, respectively, you have to switch between 4 stages. Such work takes more time than the automatic formation of loops, but such machines are cheaper.
Number of stitches
The number of stitches that the sewing machine can sew. The larger this number, the more extensive the possibilities of this model and the wider the choice of the user. However, a specific range of supported stitches needs to be specified separately.
The least options — mostly up to 25 — are provided in electromechanical machines, as well as specialized devices like overlockers and coverlocks (see "Type"). In computerized devices, the number of stitches can be in the tens, and some also allow you to download additional options from your computer.
Number of loops
The number of loops that the sewing machine can sew. Different types of loops are used for different types of fabrics and clothing. The larger this number, the wider the choice of the user and the less likely it is that the loop of the desired type will not be in the arsenal of the machine.
Adjustments
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Presser foot pressure adjustment. The ability to change the degree of pressure of the foot on the fabric, adjusting it to the thickness of the material: for thin fabrics (chiffon, knitwear), the pressure should be small, for thick ones — on the contrary.
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Thread tension regulator. A device that allows you to adjust the degree of tension of the upper thread. A mismatch in tension between the top and bottom threads causes one of the threads to pull the other and the seam deteriorates. To avoid this phenomenon, this function is provided. Note that tension adjustment is also possible for the lower thread — it is carried out through the shuttle (all shuttles have this option). But for this, it is necessary to remove the bobbin case or even the entire shuttle. The top regulator is located directly on the body of the machine, and it is much easier to use it.
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Puncture force stabilizer. A device that provides a stable puncture force regardless of the engine speed. A feature of the mechanics of electric motors is that without special adjustment, the puncture force decreases markedly with an increase in speed. This function allows you to maintain approximately the same level over the entire speed range, which has a positive effect on the quality of work.
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Feed shutdown. Possibility to turn off the bottom
...feed of the machine. This feature is indispensable for work in which the fabric needs to be shifted manually — for example, embroidering along a complex contour on a typewriter without an embroidery unit, sewing on buttons, etc.
— Speed control. The ability to set a speed limit for the machine. Thanks to this function, you can not be afraid to "squeeze" the pedal — even with strong pressure, the machine will work at a given speed, and no faster. This feature is useful, in particular, in jobs where you need to carefully control the process.
— Knee lever. A device that allows you to raise the presser foot and lower the lower feed dog with a knee movement without removing your hands from the fabric. Such a device is useful for quilting and some types of embroidery.Ruler on body
The ruler scale applied directly to the body of the sewing machine. This feature allows you to simplify and speed up some measurements in the process of work: attaching the measured segment to the body of the machine is often more convenient than looking for a ruler or centimetre tape.
