Vertical Rotary Shuttle Hook System
Industrial sewing machines and home models middle and high-end classes have the rotary vertical hook system or horizontal hook system. This type of shuttle hook has better performance in comparison with oscillating hook. This type of shuttle runs at high speeds and provides a reliable stitch formation. However, the sewing machines having such type a hook device are usually more expensive than sewing machines having oscillating hook.
A rotary hook sewing machine is a machine in which the hook rotates in a full circle around. In order to form one stitch, it must make two full circles around.
In this post you will learn how works vertical rotary hook and will find some tips for repair it.
This shuttle hook has bobbin case similar to the sewing machines with oscillating shuttle hook. But this bobbin case does not have a "finger" on the top.
Let's remove the needle plate and take a look inside this device.
I recommend periodically remove the needle plate and to clean the shuttle mechanism with brush.
See: How to clean and oil a sewing machine.
Now let's see the work of the vertical rotary shuttle. We will to lower the needle down stepwise.
First, the hook tip must go into the needle loop.
The hook point should pass very close (0.15mm) to the needle. At the same time the hook point should pass above the top of needle eye about on 1.5 - 2.5 mm.
The hook begins to turn to the left and to pull the thread down.
The hook begins turn around to the left and to pull top thread down.
During turning around the hook begins more and more pull top thread down.
At this point, the thread slips off the surface of the shuttle hook and the sewing machine starts very sharply lift top thread up.
In this position top needle thread start pull the lower thread to form the stitch.
But to form a stitch completely the vertical rotary hook must do a new full circle but now without pulling top thread.
English isn't my first language, so please excuse any mistakes and help correct them.
E-mail for sending is on the contact page.
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