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Seiko CH-2B - Clearance between Needle and Tip of Hook

Seiko CH-2B
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©
T
Clearance
between
needle
and
tip
of hook;
0.05mm
-
0.3mm
In 7B & 8B
types;
Determination
of
the
position
of
needle
bar
rock
frame.
Loosen
the
set
screw
(1)
of
the
needle
bar
rock
frame
hinge
stud,
and
the
set
screw
(5)
of
the
needle
bar
rock
frame
hinge
stud
(small) (4)
positioned
lower
part
of
needle
bar
rock
frame
(2),
and
also
the
set
screw
(7)
of
the
needle
bar
rock
frame
hinge
stud
(large) (6).
Then,
moving
the
needle
bar
rock
frame
hinge
stud
(large)
(6)
to
rightward
and
also
moving
the
needle
bar
rock
frame
leftward
& rightward-**,
and
turn
the
balance
wheel,
determines
smooth
position
of
the
needle
bar
and
adjust
the
clearance
between
needle
and
tip
of
the
hook.
After
determination
of
the
clearance,
tighten
the
set
screw
(2) of
the
needle
bar
rock
frame
hinge
stud,
and
then
put
the
needle
bar
rock
frame
hinge
stud
(small)
(4)
to
slightly
the
needle
bar
rock
frame
position
bracket
(8).
And,
put
the
needle
bar
rock
frame
hinge
stud
(large)
(6)
to
the
side
face
of
the
needle
bar
rock
frame
(2),
and
then
turn
the
balance
wheel
and
tighten
the
each
screws
exactly.
If
the
looseness
of
the
leftward
&
rightward-*-^of
the
needle
bar
should
happen,
it will
be
resulted
in
the
breaking
of
needle,
stitch
skipping.
0.05mm
0.3mm
From the library of: Superior Sewing Machine & Supply LLC

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