Vertical Rotary Shuttle Hook System

Vertical Rotary Shuttle Hook System

Industrial sewing machines and home models middle and high-end class have a rotary vertical or horizontal hook system. This type of shuttle operation has better performance in comparison with oscillating hook. This type of shuttle runs at high speeds and provides a reliable stitch formation. However, these machines are usually more expensive than oscillating hook machines.
A rotary hook machine is a machine in which the hook rotates in a full circle around. In order to form a stitch it must make two full circles around.

Vertical Rotary Shuttle Hook System

Here you can read how works vertical rotary hook and tips for repair.

Vertical Rotary Shuttle Hook System

Bobbin case is the same as the sewing machines with oscillating shuttle hook.

Vertical Rotary Shuttle Hook System

Let's remove the needle plate and take a look inside this device.

Vertical Rotary Shuttle Hook System

I recommend periodically remove the needle plate and to clean the shuttle mechanism with brush.

Vertical Rotary Shuttle Hook System

Now let's see the work of the vertical rotary shuttle. We will to lower the needle down stepwise.

Vertical Rotary Shuttle Hook System

First the tip of hook 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 eye of the needle to 1.5-2.5mm.

Vertical Rotary Shuttle Hook System

The hook begins to turn to the left and to pull the thread down.

Vertical Rotary Shuttle Hook System

The hook begins more and more pulling the thread.

Vertical Rotary Shuttle Hook System

At this point, the thread slips off the surface of the shuttle hook and the sewing machine starts too sharply lift top thread up.

Vertical Rotary Shuttle Hook System

In this position the upper thread pulls the lower thread to form the stitch.

Vertical Rotary Shuttle Hook System

But to form a new stitch the vertical rotary hook must do a new full circle without pulling the 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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