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Whether you enjoy repairing sewing machines as a hobby, a job, or your own business, it can be both exciting and challenging. There are so many different models and designs, it can be difficult to keep up.
When you decide to learn about sewing machine repair, there is a lot to learn. One of those things is understanding sewing machine hook systems.
A quick inspection of a sewing machine, and the technician can tell if the sewing machine hook assembly rotates or oscillates. These two types of mechanisms are very different, but perform the same basic function.
The Rotary Hook Assembly includes a hook that moves in a complete circle round and round. The hook slides behind the needle, and proceeds all the way around the bobbin carrier until it again slides behind the bobbin carrier. Singer sewing machines revolutionized the sewing world with their drop in rotary hook systems.
When you look at a sewing machine, look for where the bobbin is inserted into the sewing machine. If the bobbin is a top loading bobbin (one placed just below the needle plate and a slight bit in front of it), it is usually a rotary hook.
Both the front loading and side loading machines can have either hook system. A good example of the side loading machine is the popular Singer Featherweight. Bernina is famous for their front loading CB oscillating hook system, but they also produce front loading rotary systems.
It is easy to tell the difference. Rotary hooks rotate around the bobbin carrier in a continuous circle again and again. Oscillating hooks move to half way around and then go back to start again. The go back and forth " back and forth.
If you have any question, answer this. Does the hook move back and forth (Oscillating Hook) or in a complete circle (Rotary Hook)?
The Oscillating Hook Assembly involves a hook that begins a few millimeters to the top left and moves to the right sliding behind the needle and past it around to the bottom of the swing. Then the hook travels back again the same way to its original position for a return oscillation. Bernina sewing machines built their superior reputation based on their advanced oscillating hook system called a CB Hook.
Oscillating and Rotary hook systems do the same job. That job is pulling the thread from the needle around the bobbin carrier. The point of the hook slides behind and through the scarf of the needle to get the thread. Then it carries it to its destination.
In both cases, the action of the hook must precisely synchronize with the needle. Even slight variations cause problems. This synchronization is known as hook-needle timing. If you see skipped stitches, bad stitches, or none, check the hook-needle timing.
In about twenty percent of all standard sewing machine services, the hook-needle timing will need to be set. So, get use to this adjustment. It will be frequent. The cause of faulting timing can be traced mostly to user activity. Forcing the sewing machine to go beyond its intended use by pulling the fabric while sewing or sewing too thick a material is a common cause. Broken needles, wear and tear, Dirt, and debris are also common causes. To make this adjustment check your service manual for the model you are servicing. In time, you will gain confidence and do most adjustments without having to look them up.
The more you learn about how sewing machines work and how to repair them, the more sewing machine repair you can do. Just think there are millions of sewing machines just waiting to be serviced by somebody. You could be that somebody.
When you decide to learn about sewing machine repair, there is a lot to learn. One of those things is understanding sewing machine hook systems.
A quick inspection of a sewing machine, and the technician can tell if the sewing machine hook assembly rotates or oscillates. These two types of mechanisms are very different, but perform the same basic function.
The Rotary Hook Assembly includes a hook that moves in a complete circle round and round. The hook slides behind the needle, and proceeds all the way around the bobbin carrier until it again slides behind the bobbin carrier. Singer sewing machines revolutionized the sewing world with their drop in rotary hook systems.
When you look at a sewing machine, look for where the bobbin is inserted into the sewing machine. If the bobbin is a top loading bobbin (one placed just below the needle plate and a slight bit in front of it), it is usually a rotary hook.
Both the front loading and side loading machines can have either hook system. A good example of the side loading machine is the popular Singer Featherweight. Bernina is famous for their front loading CB oscillating hook system, but they also produce front loading rotary systems.
It is easy to tell the difference. Rotary hooks rotate around the bobbin carrier in a continuous circle again and again. Oscillating hooks move to half way around and then go back to start again. The go back and forth " back and forth.
If you have any question, answer this. Does the hook move back and forth (Oscillating Hook) or in a complete circle (Rotary Hook)?
The Oscillating Hook Assembly involves a hook that begins a few millimeters to the top left and moves to the right sliding behind the needle and past it around to the bottom of the swing. Then the hook travels back again the same way to its original position for a return oscillation. Bernina sewing machines built their superior reputation based on their advanced oscillating hook system called a CB Hook.
Oscillating and Rotary hook systems do the same job. That job is pulling the thread from the needle around the bobbin carrier. The point of the hook slides behind and through the scarf of the needle to get the thread. Then it carries it to its destination.
In both cases, the action of the hook must precisely synchronize with the needle. Even slight variations cause problems. This synchronization is known as hook-needle timing. If you see skipped stitches, bad stitches, or none, check the hook-needle timing.
In about twenty percent of all standard sewing machine services, the hook-needle timing will need to be set. So, get use to this adjustment. It will be frequent. The cause of faulting timing can be traced mostly to user activity. Forcing the sewing machine to go beyond its intended use by pulling the fabric while sewing or sewing too thick a material is a common cause. Broken needles, wear and tear, Dirt, and debris are also common causes. To make this adjustment check your service manual for the model you are servicing. In time, you will gain confidence and do most adjustments without having to look them up.
The more you learn about how sewing machines work and how to repair them, the more sewing machine repair you can do. Just think there are millions of sewing machines just waiting to be serviced by somebody. You could be that somebody.
About the Author:
Get more detials on repairing sewing machines Dr. David Trumble. Check out his extensive curriculum of sewing machine repair courses. Pick up your own free copy of his beginning course 7 Steps To Peak Performance For Your Sewing Machine.
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