Bobbin Case Device and Troubleshooting

Bobbin Case Device and Troubleshooting

Bobbin case is an important part of the sewing machine. If your sewing machine keeps breaking top or bobbin thread, bobbin thread bunching, looping and tangling you need check the bobbin case.
In this tutorial you find the device description and tips that help you troubleshoot these problems.

Bobbin Case Device and Troubleshooting, step 1

Firstly, let's learn the device of bobbin case.

Bobbin case for rotary hook system

There are the bobbin cases which have the "finger" and there are bobbin cases without finger. It depends on the type of the shuttle hook system.
Read more about the type of the shuttle hook system in articles: Vertical Oscillating Shuttle Hook System and Vertical Rotary Shuttle Hook System.

Bobbin Case Device and Troubleshooting, step 2

Plastic bobbin is lighter and it will better slide inside the bobbin case.

Bobbin Case Moving Device

Do you know for what is needed the holes on both sides of the bobbin? On this photo is shown their purpose.

Bobbin Case Device and Troubleshooting, step 3

Any bobbin case has a lower thread tension spring. Adjusting the bobbin thread tension is done with small screw.

Bobbin Case Device and Troubleshooting, step 4

Be careful; do not turn the screw more than one turn.

Bobbin Case Device and Troubleshooting, step 5

Different types of bobbin cases. Try to find three main differences.
The bobbin case on the right side is designed for industrial sewing machines.

Bobbin Case Device and Troubleshooting, step 6

Now I offer you my own trick that helps you adjust correct bobbin thread tension.
Note: This advice is best suited for older models of sewing machines.

Bobbin Case Device and Troubleshooting, step 7

Cut a piece from the hard plastic file and place into the bobbin, as shown.
Outline the round contour of the bobbin.

Bobbin Case Device and Troubleshooting, step 8

Now cut along the contour circle.

Bobbin Case Device and Troubleshooting, step 9

I forgot to explain why we do it. Dirty and rusty inner surface of the bobbin case will prevent the easy rotation of the bobbin. It's may be reason of the emergence of many various problems stitch sewing machine.
Thin round pad on the bottom of the bobbin case provides easy sliding of the metal bobbin.

Bobbin Case Device and Troubleshooting, step 10

For cutting the inner hole of the pad will be better to use the manicure scissors.

Bobbin Case Device and Troubleshooting, step 11

Now you need to insert the gasket into the bobbin case.

Bobbin Case Device and Troubleshooting, step 12

If it's size is too large you need trim outer (and inner) edges.

Bobbin Case Device and Troubleshooting, step 13

Everyone knows that the sewing machine must be periodically lubricate. But not everyone knows that the bobbin case is needed also periodically clean and to oil also.
The outer surface of the bobbin case must be perfectly clean and shiny as a mirror.
To oil the small joints of the sewing machine is very convenient to use a medical syringe.

Bobbin Case Device and Troubleshooting, step 14

Insert the screw driver into the bobbin case latch, as shown.

Bobbin Case Device and Troubleshooting, step 15

Add a few drops of sewing machines oil into the slots of bobbin case latch.

Bobbin Case Device and Troubleshooting, step 16

Now you get last tip. I will teach you how can quickly and easily to adjust the tension of the thread into bobbin case.
Insert the bobbin into the bobbin case. Pass the thread under the spring through the thread slot. Pull the thread 30-40 cm.
Hold the thread with fingers and pull it sharply. The thread should come out only a few centimeters.

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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