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30. MACHINE MAINTENANCE
An overlock machine requires more maintenance
than a conventional machine for two reasons :
(a) A lot of lint is produced due to the cutting action
of the knives.
(b) An overlock runs at a very high speed and
needs to be oiled frequently to lubricate the
internal working parts.
(1) CLEANING
Turn off the main power switch and unplug
the machine.
* Open the looper cover and remove all the lint
using the lint brush.
* Close the looper cover and wipe the exterior
surface of your machine with a soft cloth to
remove any dust or lint built up.
(2) OILING
Turn off the main power switch and unplug
the machine.
* To keep the machine running smoothly and
quietly the moving parts, pointed out on the
picture, must be lubricated often.
* Use supplied sewing machine oil. Do not use any
other oil, it could damage the machine.
* Wipe the machine surface to remove all excess oil
before sewing.
(3) REPLACING THE MOVABLE UPPER
CUTTER
Turn off the main power switch and unplug
the machine.
The movable upper cutter should be changed when
it becomes dull. The upper cutter can be replaced
according to the following directions.
* Open the looper cover and set the moveable
upper cutter (A) in the working position.
* Loosen the set screw (B) and remove the upper
cutter (A).
* Turn the handwheel until the upper cutter holder is
in its lowest position.
* Place a new upper cutter in the groove of the
upper cutter holder and tighten the set screw (B).
* Make sure the front edge of the movable upper
cutter is 0.5-1.0 mm lower than the cutting edge
of the stationary lower cutter (C).
218
B
A
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