34
8.13) Adjusting blade pressure
A. As in Figure 8-22, the standard is when the contact
between the movable knife and the fixed blade begins.
B. In particular, when the cutting quality gets worse by
using a thick thread, strengthen a little bit the tension of
the fixed blade.
8.14) Exchanging movable knife
Place a needle at the top by turning the pulley when
replacing the movable blade
①
and take off the needle
plate by loosening two fixed screws
②
indicated in the
figure 8-24. When assembling the exchange, assemble it
in reverse order of disassembling.
8.15) Exchanging fixed blade
A. When exchanging the fixed blade
①
, pick the washer
③
and the inner bobbin stopper
④
out by loosening the
screw
②
indicated in the figure 8-25 then disassemble by
loosening the fixed blade screw
⑤
. When assembling the
exchange, assemble it in reverse order of disassembling.
C. How to adjust the tension of the fixed blade; loosen the
nut
①
(for adjusting tension of fixed blade) using a
wrench box as shown in the figure 8-23 and adjust it
with the screw
②
(for adjusting tension).
After adjusting, tighten the nut
①
(for adjusting tension)
using a wrench box.
[Fig. 8-22]
[Fig. 8-23]
[Fig. 8-24]
[Fig. 8-25]
movable knife
3mm
wrench box
movable knife
fixed blade
fixed blade
Summary of Contents for KM-1640BL-7
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