Differential feed enables the material to be stretched or gathered while sewing. It is used for easy sewing of flexible materials and overclocking. Differential prevents undue fluffing and ripping of material.
Patchwork is a special technique for stitching fabrics. This technique sews small, different coloured pieces of fabric together to create geometric patterns.
The bottom bobbin case is positioned horizontally within a stitch plate and has a mostly transparent plastic cover for checking the amount of thread on the bobbin. The advantage of the horizontal bobbin is mainly quiet operation, the possibility of sewing at higher speeds and greater variability of stitches.
A twin needle is a kind of needle designed for decorative stitching. It has two shafts and two eyes, which allow you to sew with two threads.
Coverlocks are sewing machines that sew an under-stitch. They create a stitch that forms loops on the reverse and two parallel stitch lines on the top. This type of stitch is very flexible and necessary for stretchy or knit materials. They do not cut the fabric against the overlock.
AHA or automatic height adjustment is a function that ensures uniform pressure from the sewing machine foot on the cloth as well as when sewing different material. The stitch remains uniform and does not deform.
The overlock stitch sews the cloth in one step. It is suitable for sewing flexible materials. The classic sewing machine sews an overlock stitch with two threads, but some can do it with four.
An automatic needle threader is a sewing machine appliance that helps to thread a thread into a needle. As a result, the process is sped up, so you can start to sew within moments.