6.
ATTACHING
THE
IDLER
PULLEY
7.
MOTOR
PULLEYS
AND
BELTS
Fix idler pulley O
to
mounting
plate O by setscrew
(Caution) Adjust
the
clearance
at
O
to
just
allow
the
V belt
to
pass It
through.
1. M-type V
belts
are
used
for
this
model
of
sewing machine.
2. This sewing machine uses two V belts, one for high-speed sewing, and
the
other
for low-speed sewing.
3.
The
table
below
shows
the
relation
between
the
motor
pulleys,
V
belts,
and
sewing
speeds.
Frequency
Sewing
speed
Motor
pulley
part
No.
Engraved
mark
High-speed V
belt
Low-speed
V
belt
50
Hz
2300
s.p.m.
*13531108
50-2300
MTJVM005000
(50")
MTJVM004600
(46")
2000
*13531207
50-2000
MTJVM004900
(49")
1800
13531306
50-1800
MTJVM004800
(48")
60
Hz
2300
*13531405
60-2300
MTJVM004900
(49")
MTJVM004600
(46")
2000
*13531504
60-2000
MTJVM004800
(48")
1800
13531603
60-1800
MTJVM004800
(48")
Note: The
motor
pulleys marked with asterisks are applicable
only
to
cotton
thread.
Please
order
the
motor
pulleys
for
threads
other
than
cotton
thread.
ir Installing
the
motor
pulley
Set
motor
pulley O
onto
motor
shaft O so
that
one of two setscrews e meets the flat part of
the
motor
shaft. Then tighten setscrews O .
-3
-
iD
2.
6.
Attaching
the
belts
Set high-speed V belt O
on
the
large
diameters
of
high-speed pulley ^
and
the
motor
pulley.
Set low-speed V belt 0 on
the
small
diameters
of
low-
speed pulley 0 and
the
motor
pulley
through
pres
sure decreasing pulley O
and
idler pulley 0 .
Move
the
motor
pulley
back
or
forth
to
provide
a 2
to
3mm
clearance
between
high-speed
V belt O and
bobbin
winder wheel 0 .
Loosen setscrew
0,
and
move
the
motor
to
the
right
or
left
to
make
adjustment
so
that
the
high-speed
V
belt
comes
evenly
in
contact
with
the
bobbin
winder
wheel
when
the
bobbin
winder
is
used
(refer
to
"15.
Winding a
bobbin").
Loosen
setscrew
0 ,
and
move
motor
base 0
up
or down by, adjusting
nut
0
to
perform
adjustment
so
that
the
high-speed
V
belt
slacks
about
10mm
when
you
push
the
belt
at
middle o
Loosen
setscrew
0 ,
and
move idler pulley 0 in
the
arrowed
direction
to
perform
adjustment
so
that
the
low-speed
V
belt
slacks
about
10mm
when
you
push
the
belt
at middle 0 .
(At
this
time,
set
the
idler
pulley so
that
it is aligned
with
engraved
marker dot 0 on
the
installing
plate.)
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