– 12 –
22. MOTOR PULLEYS AND BELTS
1) A clutch motor with 400W output (1/2 HP) is used as the standard motor.
2) An M-type V belt should be used.
3) The relationship between the motor pulleys, belt lengths and sewing speeds is shown in the following
table :
* The effective diameter of a motor pulley is equivalent to the outside diameter minus 5 mm.
* The motor should rotate counterclockwise as observed from the handwheel side. Be careful
not to allow the motor to rotate in the reverse direction.
1) Loosen screws
2
and
3
in feed eccentric cam
1
,
move the feed eccentric cam in the direction of
the arrow or opposite direction of the arrow, and
rmly tighten the screws.
2) For the standard adjustment, adjust so that the
top surface of feed dog and the top end of needle
eyelet are flush with the top surface of throat
plate when the feed dog descends below the
throat plate.
3) To advance the feed timing in order to prevent
uneven material feed, move the feed eccentric
cam in the direction of the arrow.
4) To delay the feed timing in order to increase stitch
tightness, move the feed eccentric cam in the op-
posite direction from the arrow.
Be careful not to move the feed eccen-
tric cam too far,or else needle break-
age may result.
21. ADJUSTING THE FEED TIMING
WARNING :
To avoid possible personal injury due to abrupt start of the machine, turn off the power to the
machine and check to be sure that the motor has totally stopped rotating in prior.
Standard feed timing
Advanced feed
timing
Delayed feed timing
1
3
2
Motor pulley
O.D. (mm)
Motor pulley part No.
Sewing speed (sti/min)
Belt length Belt part No.
50 Hz 60 Hz
110 MTKP0105000 4,440 - 1092 mm (43") MTJVM004300
105 MTKP0100000 4,250 -
1067 mm (42") MTJVM004200
100 MTKP0095000 4,000 -
95 MTKP0090000 3,820 -
90 MTKP0085000 3,610 4,320
85 MTKP0080000 3,390 4,000
1041 mm (41") MTJVM004100
80 MTKP0075000 3,160 3,790
75 MTKP0070000 2,950 3,520
70 MTKP0065000 2,740 3,260
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