(2) Things to be checked after adjustment
1)
Turn
outer
sleeve
® 2
mm
(5/64")
in
the
reverse
direction
and
release
it.
The
outer
sleeve
shall
return
easily.
If there is any friction, clutch
spring
®
will
not
drive
the unit. If it
shakes
while
rotating,
sounds
will
be
produced
inthe
gears.
Correct
theend
face
of
thrust
collar
® or
replace
it
with
a
suitable
replacement
part;
B3016-980-00A
Thrust
collar for sleeve, 11.6
mm
thick
B3016-980-00B Thrust collar for sleeve, 11.75 mm thick
2) Tum
driving
pulley
® in the
direction
of the
arrow
untilthe shaftstopsand
check
that the top endof
reverse
rotation
preventing
latch ® is0.1 to 0.2 mmawayfromthe front
face
of the
pawl
of outer
sleeve
® .
If the clearance is greater than that, the latch willfail to
engage
with the pawland willidle and shakewhen the
motor is engaged. If the clearance is
too
small, clutch spring ® will not actuate the unit.
Replacethe clutch springwith a suitable one from amongthe 3 different types of
spring.
3)
When sounds are produced;
A.
If
the
gears make sounds;
a. Correct any
excessive
playin the axialdirection in the gears(largeand small).
b. Remove dust or foreign bodies from the gear teeth.
B. If a vibration noise is produced;
Check the clearance at the
reverse
rotation preventionlatch according to 2) of (2) Thingsto be checkedafter
adjustment.
4)
Other failures
The following failures may occasionally occur;
A. The shaft
of
the gear (large) on the mating surface with the clutch spring has worn out.
If its
diameter
becomes
19.2mm(3/4") or
less,
renew
the gear
assembly.
B. The clutch spring is defective.
If the inner
diameter
of the
clutch
spring
has
become
18.9mm(3/4")or
more,
or if the
spring
is
deformed,
renew
it.
(3)
Adjustment
of
the
thread
trimmer
components
1) If the
moving
knife
shakes
with a click
while
the
machine
is
running
at low
speed,
remove
the thread trimmer
components
except
for the
thread
trimmer
cam
on the
main
shaft and insert the
stop-motion
cam
assembly
without
tightening
the
setscrews.
Insert
bed
hook
(See
page
1"1.
Frame
and
Miscellaneous
Cover
Components"
in the Parts
Book)
into gap ®
between
the stop-motion hook and the
closest
point of the stop-motion cam
(at the point
where
the
radius
of the
stop-motion
cam
is the
largest)
and
ensure
that
there
isa0.7 to 0.8
mm
(1/32")
clearance
between
the thread
trimmer
camand the cam
roller
(at point © ).
If
edge
©
(B1109-280-000)
of the
driving
plate
is
worn
out, the
cam
roller
will
not be
kept
away
from
the
thread trimmer cam surface.
Replace
the worn driving plate (B2624-980-000).
If the clearance at © is too small,the trimmer knife willshake with a click during low speed operation. If the
clearanceis too much, the start pedal will become heavy.(Fig. 42)
2) If the trimmer knife does not
move
enough, check it in the
following
way;
Put the stop-motion hook into the stop-motion cam at point
© as shown in Fig. 43 and let the cam roller rest in the
recessed
part of the
thread
trimmer
cam
(point ® ). In
this
position,
there
must
be a
0.5
mm
(about
1/64")
clearance
at
point © .
If there is no clearance at point © and the cam roller does
not
come
into
contact
with
the
thread
trimmer
cam
at
point
© , the
moving
knife will not trip sufficiently to hook the
thread for cutting. If the clearance is too much, it will make
the clearance at point © smallerduring low speed opera
tion
and
make the
start
pedal heavy.
3)
Tension
spring
on the knife
driving
connecting link
If the tension spring is not installed or it does not produce
correct tension in the knife driving bar (4.6 Kg when the
entire
length
is 99
mm
(3-57/64")),
the
moving
knife
will not operate correctly. Replace the tension spring
(B2410-980-000) if it is found to be defective.
-
30
0.7
to
0.8
mm
(1/32")
O
Driving
plate
(B2624-g80-000)
Fig.
42
Fig.
43
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