If even users who have nothing to do with the sewing business know about the sewing machine, then only specialists are familiar with the carpetlock.

The coverlock is a universal device that combines the functionality of an overlocker and a sewing machine. It is intended for making various types of seams and trimming edges in knitted, elastic and loose fabrics.

The ability to perform flat seams is an important difference and advantage of coverlocks over overlock devices. It is logical that the cost of such devices is much higher than the cost of sewing machines and overlocks separately.

What is it needed for


The purpose of the carpet lock is to overcast the edges, grind parts, make decorative, chain, flat seams and other available operations.

At the same time, it does not replace the traditional sewing machine, but acts as its functional addition to perform work operations that are not available on the machine.

A universal device that successfully replaces three sewing devices: a sewing machine, a sewing machine and an overlocker.

In all branded products, the seams are made with a strong chain stitch, which guarantees high quality workmanship and a long service life of the finished item.

In addition, the carpet lock is not intended for making modified curly stitches and elements – zigzags, herringbones, loops, etc. Such equipment is equipped with highly reliable control systems, functional displays and electric motors.

Types of carpet seams

Seam types

Modern models of universal coverlocks provide for the implementation of various types of lines, the total number of which reaches 20. In addition, such a device is characterized by high productivity and a wide range of working options.

The looper performs the weaves or seams. The number of stitches obtained depends on the type of looper. With the help of a carpetlock, you can perform the following seams:

  • Three-thread – narrow and wide overcasting, Flatlock narrow and wide, rolled for hemming and edging;
  • Four-strand – standard overcasting.

Overcast seams are intended for processing fabric sections and for grinding individual parts of products. They are performed by a looper, which is located in the lower part of the body. The top stitch is made with a needle, the bottom stitch with a looper.

Between themselves, the stitches are connected by an additional thread, which is threaded by a looper located in the upper part of the body. This technique allows you to create strong seams that securely fasten sections of elastic fabrics.

A four-thread seam is made according to the same principle, only in this case an additional needle of the top row is added. It is intended for stitching the edges of products and for grinding parts.

flat lock – This is a special type of flat seam that is sewn only on a fold or cut of fabric. Rolled seams, hem seams and a narrow border are made by a looper without a tongue.

Models with converters allow for two-thread weaving. The converter is a small metal bracket that is mounted on the upper looper. In this case, the threads are threaded into the upper needle and the looper at the bottom.

This technique allows you to get the following types of seams:

  • Overcasting narrow;
  • Flatlock narrow/wide;
  • Role for hem.

Most often, carpet is used to make such seams:

  • Covering. It is used for topstitching edges in knitwear. The front side of the seam is made with double stitching, and the wrong side is trimmed with edge covering. Designed for sewing underwear, T-shirts, T-shirts, shirts, etc.
  • Role-playing. It is used for the convenience of overcasting thin flowing and loose fabrics – organza, chiffon, silk. The edges are twisted and processed with a thin rolled seam so that there is a minimum distance between adjacent stitches.
  • Chain. It is carried out using a special chain looper, which is included in the standard equipment of the device. This is a reliable and durable line, which is intended for connecting individual parts of products.

How to choose a carpet


Almost any model of carpet lock works efficiently, reliably processes thin fabrics, therefore it is well suited for home and professional use.

To select a suitable device, it is recommended to consider the following functional parameters of the coverlock:


To work correctly with the coverlock, the user needs to understand the threading procedure. Here it is important to know in what sequence and according to what principle refueling is carried out in order to perform a high-quality line.

Many models are equipped with a special device – the needle threader, which provides automatic threading of the needles. Its principle of operation is simple: the hook passes through the eye of the needle, hooks the threads and pulls them back.

Looper threader

In addition to the working needles, the lower looper must also be threaded. Manual threading is difficult, so a beginner should choose models equipped with an automatic looper threading device.

The choice of thread for carpet

Since the carpet lock is used for thin and split fabrics, therefore, the threads must be selected of the appropriate type. The carpet lock is sensitive to thread tension, so you should use elastic tapered threads for sewing.

It is important that they are thin and not curled. Length of threads on reels: 2000 – 9500 meters.

It is not recommended to use cotton or woolen threads.

Dividing type conveyor

In the process of sewing, soft and elastic fabrics are able to stretch, which leads to deformation of the seams being made. To prevent such a situation, coverlocks are equipped with dividing conveyors.

Structurally, they consist of separate combs, one of which is installed in front of the working needles, and the other behind them.

The fabric cut feeder allows you to select the appropriate range of movement of the combs so that the fabric does not stretch or shrink during sewing. Additionally, the conveyor allows you to create gathers, ruffles or waves in the right places.


A special device that is provided for the upper looper. It allows you to create reliable and durable two-thread weaving of various types. The converter is present in almost all models of coverlocks, regardless of their cost.

Thread tension

Threads can be tensioned manually or automatically. Of course, automatic tension is considered more perfect and preferable for sewing quality. This method provides for tension with the same force, which eliminates sagging.

Manual tension does not guarantee the accuracy of the result, so there may be some imbalance in the thread tension. Therefore, it is recommended to give preference to devices with automatic adjustment.

In expensive models, tensioners are installed in one line, which contributes to uniform tension even at high stitching speeds. In budget devices, they are provided on the front panel, which does not always guarantee a high-quality stretch.

Adjusting the degree of pressure of the foot of the carpet lock


This function allows you to adjust how much the presser foot presses down on the piece of fabric while sewing. Dense fabrics should be pressed lighter, thin fabrics should be pressed tighter.

Different models of devices provide for different adjustment of the degree of pressure, depending on the method – manual or automatic.

Puncture of tissue with a needle

A similar function provides control over the force of a puncture with a needle of any type of tissue. It is performed automatically, taking into account the type and thickness of the material. The option is effective when sewing products from thin knitwear.

Cutting Width Adjustment

This option provides for independent setting of the width of the cut of any type of fabric when processing edges. This allows you to get accurate and even lines.

Detachable sleeve platform

Some models have a narrow removable platform, which is intended for processing individual elements and parts of products – collars, sleeves, cuffs, etc.

Thread cutter

Many device models have a thread cutter. This is a thin, sharp blade that is built into the work platform or upper body with needles attached. Some products are equipped with two knives for trimming the threads of the upper and lower feed.

In expensive devices, an automatic thread trimming option is provided, which is activated by a special button located on the front of the case.

Scrap container

The carpet lock, like other sewing equipment, is equipped with a special container for collecting fabric scraps and threads. After work, it can be removed and carefully cleaned of accumulated debris and dust.

Color marking

This option is present in cover stitches and overlock machines, it schematically indicates the correct threading of the loopers, taking into account the types of stitches being sewn.

Coverlocks use multiple threads, so color coding avoids customization errors.

Sewing speed

The parameter determines the working potential of the device when performing stitches per unit of time. Modern carpetlocks are capable of making from 950 to 1550 stitches per minute.

Expensive machines perform the maximum number of stitches while maintaining high sewing quality.

Working power

The power of the device determines its energy consumption. The lower this indicator, the more economical the device. The operating power of carpet locks is from 80 to 250 watts.



Some models of coverlocks are equipped with displays that display work operations, types of seams performed, stitch patterns, service information, etc.

Expensive models display basic working data – stitch sizes, thread tension, selection of suitable needles.

To expand the functionality of the device, it is additionally recommended to purchase:

  • Foot for stitching sequins, beads, rhinestones, sequins, decorative ribbons;
  • Foot for making universal seams;
  • Foot for sewing on braid and bias tape;
  • A foot for sewing in fur trim along the edges of clothing;
  • A foot for making tucks, gathers, ruffles and pleats;
  • A guide for sewing stitches.

A high-quality functional device from reliable and trusted manufacturers of sewing equipment is made of reliable metal parts that guarantee wear resistance and durability of the structure.

The device is equipped with self-sharpening knives, which are made of hardened steel, resistant to corrosion. When choosing a faithful assistant for domestic use, you should give preference to models whose weight does not exceed 8-9 kg.

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