6
VT2500
2. Installation
2.3 Motor, pulley and belt
Clutch motor
◇ See the instruction manual of the motor you are
using.
◇ The clutch motor should be installed in a
position where the center of the motor pulley
② and the center of the machine pulley ①
align with one another when the pedal is
depressed and the motor pulley ② moves to the
left.
◇ Commercially available pulleys have outer
diameters incremented every 5 mm, therefore
pulleys are specified by commercial sizes.
Use of an inappropriate motor pulley may cause the
sewing machine to exceed the maximum speed whereby
resulting in breakdown.
CAUTION
40゜
5.5mm
10mm
66.5mm
V-belt of M-type
011
①
②
Servomotor
See the instruction manual of the motor you are
using.
Calculate motor pulley outer diameter from the
below formula. Or select the best size of motor
pulley from Table 2.
Sewing speed
Motor pulley O.D.= ――――――――― ×66.5 + 5mm
Servomotor speed
◇ Commercially available pulleys have outer
diameters with every 5 mm increment, therefore
select a pulley of an outer diameter that is
near to the calculated outer diameter.
Belt
Use an M-type V-belt.
For sizes, see Table 1.
Table 1
Motor pulley
O.D. (mm)
Sewing speed (rpm)
Belt size
50Hz
60Hz
75
3600
M36
80
3850
M36
85
3400
4100
M36
90
3600
4350
M37
95
3800
M37
100
4000
M37
105
4200
M38
110
4400
M38
◇
Numerical figures are given for a 3-phase,
2-pole, 550 W (3/4 HP) clutch motor.
Table 2
Sewing speed
(rpm)
Motor pulley O.D.
Servomotor speed
(rpm)
3000
3600
3500
83
70
3800
89
75
4000
94
79
4300
100
84
4500
105
88
◇
Numerical figures are examples for servomotors
of 3000 and 3600 rpm.