34
c) Adjustment of the lower thread holder
The whole side of the lower thread holder① must adhere to
the lower side of the movable blade②. Also the lower
thread holder① tip should be positioned 2.5~3.0 mm
inwards off the tip of the movable blade②. For adjustment,
unfasten the fixing screw③ of the holder and retighten
afterwards.
b) Maintaining the fixed blade
Check the condition of the movable knife tip if thread
does not break easily during operation or if the thread tip
is untidy. When the blade tip is dull, use sand paper or
oil grindstone to sharpen the edges.
D. Checklist for assembly of other trimming devices
a) Checking the operation starting point of the movable
blade during trimming when the movable blade begins
to move by manual trimming operation, check whether
the take-up lever① is sitting on the lowest point or 2.5 mm
above the lowest point.
①
①
③
②
③
OIL GRINDSTONE
SAND PARER
70°
70°
[ Fig. 57 ]
[ Fig. 58 ]
[ Fig. 59 ]
①
22..55~~33..00mmmm
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