In this system, the shuttle hook catches the thread when the needle is going back up through the fabric and the hook then carries the thread around the bobbin cage to form the stitch, going all the way around the bobbin. … This need for precision means that rotary hook sewing machines have tight thread tolerances.
What is a shuttle hook?
A common sewing machine design uses a floating shuttle hook. The floating hook design allows a top thread loop to pass completely around the bobbin assembly. A lock stitch is formed when the top thread has looped completely around the bottom thread. The take-up lever ensures a tight stitch.
What is shuttle in sewing machine?
A vibrating shuttle is a bobbin driver design used in home lockstitch sewing machines during the second half of the 19th century and the first half of the 20th century. It supplanted earlier transverse shuttle designs, but was itself supplanted by rotating shuttle designs.
How does a rotary hook work?
The rotary hook continuously rotates in place, hooking the upper thread each time its pointed tip passes the 12 o’clock position. Enough upper thread is pulled from above to pass around the bobbin case, which sits loosely inside the hook frame such that loops of thread can pass completely over it.
What should my sewing machine tension be set at?
The dial settings run from 0 to 9, so 4.5 is generally the ‘default’ position for normal straight-stitch sewing. This should be suitable for most fabrics. If you are doing a zig-zag stitch, or another stitch that has width, then you may find that the bobbin thread is pulled through to the top.
Do all sewing machines need to be oiled?
All sewing machines are a little different. … Many newer sewing machines come prelubricated and do not need additional oil. However, it’s usually OK to add a drop or two in the bobbin case if you feel like your sewing machine needs it. The more often you use your sewing machine, the more often it needs oil.
What is the function of a tension screw on a sewing machine?
The tension discs squeeze the thread as it passes between them, while the tension regulator controls the amount of pressure on the discs. On older machines, there are only two tension discs, controlled by a screw or knob.
What is the function of presser bar lifter?
The major function of the presser bar lifter is to control the movement of the presser foot. The presser foot is a piece of double-sided equipment with flat edges. When sewing is going on, it is important that the presser foot be down.
Why are there two spool pins on a sewing machine?
This arrangement allows the spool of thread to stay out of the machine’s sewing mechanisms and permits easy access for the machine user. If a machine has more than one spool pin, the machine can most likely utilize more than one needle simultaneously.
What is gummy dust?
Gummy – a thick of sticky quality such as oiled accumulated dust on sewing machine part.
What is Rotary stitch?
The Rotary Stitch Master sewing machine works at a speed up to 1800 spm (stitches per minute) to give a better output. To ensure seamless working, it has a full rotary hook, is compatible with special attachments that aid stitching, and is capable of working on a variety of fabrics ranging from light to heavy.
What is top loading full rotary hook bobbin?
A “top loading” bobbin/ hook is the same thing as a “horizontal hook“. “Rotary” means that the hook continually spins in one direction. Most of the Janome vertical hooks are oscillating. This means that they rock back and forth during the stitch formation.
What is horizontal rotary hook?
In horizontal rotary hook machines, the hook is either located in front, to the side of, or behind the needle hole. All of these configurations are considered top loading, regardless of orientation.