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Below are some pictures of machines brought in
for service as an example of why regular service is important. The
pictures also show some problems that can occur with machines. Sewing
machines are mechanical devices that require periodic cleaning and lubrication.
Use of poor quality fabric and thread that generates excessive lint can create
more problems in your machine.
  These
pictures show lint in the hook race of a machine. While lint in other
parts of the machine can be dry, lint in the hook race tends to be oily from oil
on the hook and it then packs into the hook race. This can cause noise and
premature wear of parts. This lint can be removed with a wooden toothpick
after the hook is removed.
  These
pictures looking from the front and the rear of the machine show lint in a
machine with a rotary hook that uses drop in bobbins. Typically, machines
with drop in bobbins accumulate more lint in the hook area since the bobbin case
is not easily removable by the customer for cleaning the machine. Front
loading bobbins provide easy removal of the bobbin case for cleaning and general
maintenance.
 This
shows the needle bar of a machine with accumulated lint.
 This
shows the hook area of a machine with accumulated lint.
 This
shows the rear of the free arm of a machine with accumulated lint.
 This
shows thread wrapped around the needle linkage of a machine. This can
happen if the thread breaks while sewing and the machine continues to run.
If enough thread is wrapped in the linkage, the machine can bind and stop
running.
This shows another example of thread wrapped
around the needle linkage of a machine.
 This
shows the rear of the free arm of a machine with accumulated lint.
 This
is another picture of the rear of the free arm of a machine with accumulated lint.
  These
pictures show thread and lint caught in the top tension discs. The top
tension discs "squeeze" the top thread to provide top tension and if thread or
lint is caught between the discs, the discs are held apart and cannot provide
the proper tension to the top thread.
This is another example of thread and lint caught
in the top tension discs.
 Here is another example of thread and lint caught
in the top tension discs.
   These
pictures show part of a broken needle jammed in the hook race. When the
hook rotates and contacts the needle fragment, the hook cannot move and the
machine jams.
   These
pictures show part of a broken needle jammed in a horizontal rotary hook.
The first picture is with the needle plate and bobbin case in place, the second
picture has the needle plate removed, and the third picture has the bobbin case
removed. This needle fragment also jams the machine. However, with a horizontal
hook and a drop in bobbin, access to the needle fragment is harder for a
consumer.
 This
picture shows a needle plate damaged from being hit by the needle. Such
needle plate damage is caused by pushing and pulling on the fabric while sewing.
A sewing machine should feed the fabric and the consumer should only have to
guide the fabric while sewing. Pushing and pulling on the fabric causes
the needle to deflect and strike the needle plate, breaking the needle and
damaging the needle plate.
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