IV. HOW TO ADJUST THE MACHINE
1.
TIMING
OF
THE BOBBIN
CASE
OPENING MECHANISM
When the
upper
line engraved
on
the needle
bar
(CD
of
Fig.l7)
coincides with the
bottom
surface
of
the needle bar frame ( ® of
Fig.l7),
in other word, when the needle
bar has gone
up
by 0.2
~
0.3mm(l/l28"
~
3/256")
from
it's
bottom
dead point,
two
engraved marks located od the pivot
of
the bobbin case opening lever link must aligned
with each
other
as
shown in Fig.l8.
Fig. 17
Fig.18
2.
ADJUSTING THE BOBBIN
CASE
OPENING MECHANISM
Adjust the position
of
the bobbin case opening lever
(CD
of
Fig.20) so
as
to
open the
bobbin case holder allowing the thread
to
pass through depending
upon
the thickness
of
such thread
at
the moment when
the
needle thread
is
pulled
up
along
the
bottom
surface
of
throat
plate
as
shown in
Fig.l9.
To adjust the said lever, loosen
the
screw
( ® of Fig.20),
obtain
a correct position and finally tighten
the
screw. You must be
careful
not
to
allow it
to
open the bobbin case holder
too
much, or the sewing
hook
may make a high noise and shorten
it's
lifetime.
Fig.
19
Fig.
20
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11-
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