– 9 –
2. Selecting the motor pulley and the belt
3. Installing the motor
M o to r
pulley
5.5 mm
10 mm
M type V belt
Use a clutch motor of 3-phase, 2-pole, 400 W (1/2HP).
Use the M type V belt.
1) The motor pulley shifts to the left-hand side when
depressing the pedal. At this time, install the motor
so that the centers of motor pulley and lower pulley
align with each other.
* For the installing procedure of the motor pulley, refer
to the Instruction Manual for motor.
Lower
pulley
2) Install the motor so that the pulley rotates clockwise.
If the machine pulley rotates in the reverse
direction, nomal lubrication cannot be
performed. As a result, machine trouble will
be caused.
4. Setting the belt
1) Fit belt
1
to lower pulley
2
.
2) Turning upper pulley
3
, set the other side of the belt
to motor pulley
4
.
3) Adjust the belt tension so that the belt sags 15 to 20
mm when the center of the belt is pressed with an
approximate 10N (1.02 kgf) load.
4) Securely x the belt with lock nut
5
when the belt
has been set.
the sewing machine is operated, check again
the belt tension.
1
3
4
5
2
15 to 20mm
* The table shows the numbers when a 3-phase
2-pole 400 W clutch motor (1 / 2 HP) is used.
* The commercially-available motor pulley near to
the counted value is designated since the outside
diameter of the commercially-available motor pulley
counts by 5 mm.
Use a motor pulley which is adaptable to this
machine and machine trouble will be caused
unless a motor pulley which is adaptable to
this sewing machine is used.
When you use a new sewing machine, use
the machine at a speed of 4,500 sti/min or
one month). A good result can be obtained in
terms of the durability.
Motor pulley and belt
50Hz 60Hz
Speed of
stitch (sti/min)
Pulley size Belt size Pulley size Belt size
4,500 ø 100 M-39 ø 85 M-38
4,800
ø 110 M-40 ø 90 M-38
5,000
ø 115 M-40 ø 95 M-39
5,500
ø 125 M-41 ø 105 M-39
5,800
ø 135 M-42 ø 110 M-40
6,000
ø 140 M-42 ø 115 M-40
6,200
ø 145 M-43 ø 120 M-41
6,500 ø 150 M-43 ø 125 M-41
WARNING :
When replacing the belt, be sure to turn OFF the power to the motor and ascertain that the motor has
totally stopped rotating before starting the work. There is a danger of injury since hands or clothes may
be caught in the belt.
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