Tangential Adjustment Of Sewing Hook - Husqvarna Viking Automatic 21 Service Manual

4
.
Centring needle in throat plate hole
Set the needle
swing control for maximum stitch width
.
Turn
eccentric (
1
Fig
.
3 )
on
the
needle
-
bar frame (
3 Fig
.
3 )
,
which
serves as
bearing for
link (
4 Fig
.
3 ) from the zig -
zag
drive
,
until the needle swings in the
throat plate hole with equal
clearance
on
both sides when the hand
-
wheel
is
turned
.
Loosen set screw
( 2 Fig
.
3 ) before
making the settling
,
and tighten it afterwards
.
Setting
centre
position for zig - zagging
Set
the starting
-
position control at
the centre position and the needle
swing control at 0
.
Loosen
screw
(
1 Fig
.
4
)
,
and make the setting by
pressing
or
easing
follower ( 2 Fig
.
4
)
until the needle is
centred in the
throat plate hole
.
5
.
Tangential adjustment of sewing hook
Set
the machine for straight stitching in the right
-
hand starting position
,
and for
a
zig
-
zag
stitch 5 /
u
in
.
( 2
mm
)
wide
.
Use
the handwheel
to
bring
the needle about
s
/
64
in ( 2
mm
)
above the lower end of the stroke
on
the way up
.
Loosen
the bevel
gear ( 1 Fig
.
6 ) on the
lower camshaft and
screw
it fast again in such
a
position that
the
tip ( 1 Fig
.
5 )
of the sewing
hook
comes in
line with the centreline of the
needle ( 2 Fig
.
5 )
.
The
arm
sleeve
must
be removed for this setting
.
6
.
3