Yamato VE2700-8 class, Instruction Manual, Page: 16 / 48

6
2. Installation
VE2700-8
2.4 Pulley and belt
Clutch motor
To install a clutch motor, align the center of the machine
pulley with that of the motor pulley when the motor pulley
shifts to the left by toeing down the pedal.
Note: Table 2 shows the outside diameter of the mo-
tor pulley, the sewing speed of the machine, and
the size of the belt when using the clutch motor of
3-phase, 2-pole, 550 W (3/4HP).
The outside diameter on the table shows the near-
est size to the calculated values based on the com-
mercial available pulleys at intervals of 5 mm.
Use only those motor pulleys applicable to the machine.
If not applicable, the sewing speed will be over maximum
and it can cause damage to the machine.
Belt
Use a V-belt of M-type.
For belt size, refer to Table 2.
Fig. 2-8
Table 1 Numbers in () is calculated values.
Table 2
V-belt of M-type
5.5 ㎜
10 ㎜
40°
Servomotor
Use a servomotor with an output of 500 W or more.
Calculate the outside diameter of a motor pulley from the
formula as below.
Or refer to Table 1 to select a proper motor pulley.
Outside diameter Usual sewing speed
of motor pulley Servomoter speed
= × 61 + 5 mm
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Proper sizes of the pulley and the belt differ according to
the table type and the sewing speed.
To install the motor, see the instruction manual for the
motor.
Outside
diameter
of pulley
( ㎜ )
Sewing speed
of machine
(sti/min)
Size of belt
50Hz 60Hz
Semi-
submerged
Table top
type
60 2900 38 31
65 3150 38 32
70 3400 39 32
75 3000 3900 39 32
80 3250 4150 39 33
85 3500 4400 40 33
90 3750 40 33
95 4000 40 34
100 4250 41 34
Sewing speed
of machine
(sti/min)
Outside diameter
of motor pulley ( ㎜ )
rpm of servomotor
3000 rpm 3600 rpm
3000 65 (66) 55 (56)
3200 70 (70) 60 (59)
3500 75 (76) 65 (64)
3700 80 (80) 70 (68)
4000 85 (86) 75 (73)
4200 90 (90) 75 (76)
4500 95 (96) 80 (81)
61 ㎜