d. Heavy Working
(1)
Lack
of oil.
(2)
Mechanism
clogged by inferior lubricants.
{3}
Pieces
of thread
[ommed
in shuttle race.
{4}
Belt
too long ortensioned improperly.
e.
Irregular
Stopping
(1)
Thebroke mechanism does not work properly.
To
adjust
the
brake
mechanism,
proceed
as
instructed
on page
51.
Take
care
that
the
broke
lever
tension
spring
is
not
too
strong,
as
this
might
cause
the
machine
to
stop
too
eorly,
particularly
when
the
driving
belt
is
a
little
slack.
If,
on the other
hand,
the
tension
spring
is
too
weak,
this
may
cause
the
machine
to
moke
one extra
stitch,
particularly
when
the
driving
belt is rather
tight.
(2)
Thestop motion mechanism is timed improperly.
To
adjust the stop
motion
mechonism,
proceed as
instructed
on poge
49.
Moke
particularly sure that the stop
motion
lever
snaps intothe groove on the
stop
cam
freely.
(Check
to see that the
ball
joint
connection
(22772)
which
connects to the lower end of the
locking
lever
(22530)
does not jam. If it does,
straighten the connection).
(3)
Stop com spring is broken or has lost its resilience.
A
powerful
spring
is
housed
in
the
hollow
driving
pulley
and
serves
to
absorb the momentum of the machine when it stops. Since this spring is
subjected to
excessive
stress,
it
may
lose its
resilience
or break by fair wear
and tear after prolonged use. If the stop cam spring has become
unservi
ceable, this is indicated by the irregular stopping of the machine, i.e. the
needle bar is not always at the same position when the machine stops.
To
replace a
broken
stop cam spring,
remove
tension
springs
N and O
(Fig.
65),
take out the hinge
screw
connecting
the
locking
lever
with
the boll
joint
connection,
loosen
screw
K
(Fig.
66),
pull
out hinge stud Q
(Fig.
65),
and
strip stop motion lever p and brake lever
R.
Next,
take
out
the
four
screws
b,
strip
cap
ring
A,
and
remove
stop
cam
S
and the
broken
stop cam
spring
(Fig.
65).
Clean the
spring
housing
and all
component
parts.
Insertion of a new stop cam spring is greatly facilitated by the use of a
special
wrench
which
is available under No.
20057-1.
To insert the new
spring,
proceed
as follows:
a. Place one
check
block
(Fig.
67)
on the stud in the stop cam spring housing.
b. Insert new stop cam spring.
c.
Insert
punch
D into hole 1 of the
driving
pulley,
as
shown
in
Fig.
67.
Then
rotate the
pulley
until
the
punch
bears against the left bearing
bracket.
72
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