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D) Adjusting lower thread holder
When the movable knife ① returns to its initial
position after completing its trimming action
(arrow
), like in figure 48, adjust the lower
thread holder by loosening the fixing screw ③ to
make the distance between the movable knife
edge and lower thread holder edge approximately
8mm and to make the middle point of the lower
thread holder ② edge to move 0.5mm towards
inside (arrow
). Now, make sure to check that
the inner side of the movable knife and the
middle point of the lower thread holder edge are
closely adhered as can be seen in part
(4) Checkpoints on the assembling status of other
trimming devices
A) Check the starting point of the movable knife
when the trimming action takes place
※Operate the trimming action manually to
check whether the thread take up lever is about
10mm higher than its lowest point when the
movable knife starts working, as in figure 49.
B) Maintenance of fixed blade
When the thread does not get trimmed or if the
trimmed section of the thread is sloppy, please
check the edge condition of the fixed blade.
If the edge of the knife is too dull, sharpen the
edge using oil stone or fine sand paper.
(See figure 50)
32
②
②
.
(OIL STONE)
③
①
②
8mm
①
About10mm
(Point where the
Thread take up
lever's lowest point
65。
(SAND PAPER)
①
③
[Figure 48]
movable knife starts
its movement)
[Figure 49]
65。
[Figure 50]
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