~xactly
in
line with
the
feed
eccentric timing mark
on
the
orin shaft.
On
all
machines fitted with a
cleated
Synch
'l"
oflex driving belt, the position pin on
the
upper
driving
belt
sprocket
and
the
timing
mark
on the orm
shaft
ore
offset
against
each
other
by
180°
.
The
Needle
Vibrating Eccentric Bevel
Gear
Th
is
gear
is
carr
i
ed
on a transverse
shaft
which con
be
moved lengthwise
of
its
fla nged bushing
and
is
secured in position by a
grub
screw. The timing mark
on the flanged bushing should point upward (Fig.
78)
.
Fi
g.
78
Fig
.
79
To
ensure
that
the
sideways motion
of
the
needle
bar
wi
ll
be
completed when
the
po
in
t
of
the
needle
has
reached a position
about
1
/.~,
or
5
to
6 mm,
above
the
need
le plate, check the following setting:
Turn 1he a rm shaft until the feed
eccentr
ic timing mark
is
at
the
top.
loosen
the s
et
screws on the arm shaft bevel
gear
and,
while keeping it in mesh with
the
needle
vibrating bevel
gear,
turn it until the tim ing mark
on
the
collar
of
the
needle
vibrating bevel
gear
po
ints upward.
In
case
there
is
no mark on the
needle
vibrating bevel
gear,
hold the arm
shaft with its timing mark
point
ing
upward
and
turn the
arm
shaf
t bevel
gear
un
til
the
lobe
of
the needle vi
brating
eccentric
is
at
the
top
.
Move
the
arm shaft bevel
gear
on
the
shaft,
as
may
be
required
to
minimize
the
amount
of
play
and
ensure
smooth
running
of
the
gears. At the
same
time,
check
to
see
that
the
gears
ore
set
at
right
angles
to each
other,
and
t
hat
the
ends
of
their teeth meet
in
one
point. If,
after
this adjustment, the needle
bar
frame
pitman should jam between the
need
le vibrating eccentric bevel
gear
and
the
flanged bushing, adjust the position
of
the
Iotter on its shaft. Securely
47
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