12.4
Left
bobbin
case
opener
Correct
setting:
When shaft3 of
the
left bobbin
case
opener
is at its front point of reversal
(see
arrow),
as
seen
in
the
direction of
feed,
there
should
be
a
clearance
of
0.3
to
0.5
mm
between
the lugofthe leftbobbin
case
base
and the frontedge ofthe needle plate slot.
12.4.1 Bringthe needle bar to bottom
dead
center.
12.4.2 Continue turningthe balance wheel in its normaldirection
until
shaft 3 ofthe left bobbin
case
opener Is at its front pointof reversal
(see
arrow).
12.4.3 Loosen clamp screw 4 of the connecting crank on the leftshaft 3.
12.4.4 Reposition the connecting crank on its shaft
so
that there Is a clearance of 0.3 to
0.5 mm between
the
lug of
the
left bobbin
case
base
and
the
front
edge
of
the
needle
plate
slot.
12.4.5 Inthis
position,
tightenclampscrew4,
making
sure thattheconnecting crankis not
tilted.
12.4.6 Check this adjustment
(see
"Correct setting").
19
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