11
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7
】
UPPER LOOPER ADJUSTMENT
7-1 Gauge of upper looper and needle
■
The gauge of the upper looper and the needle is the distance between the point of the
looper and the center needle when the upper looper is at the extreme left of its travel.
Gauge varies according to models. Refer to the illustration below.
■
The gauge adjustment is made by loosening the
clamp screw A and looper setting is made by
loosening the clamp screw B.
7-2 Looper relation (upper to lower)
When upper looper crosses lower looper, certain
amount of clearance is needed.
Refer to the illustration on the right. To make this
adjustment, loosen clamp screw B.
Model
a(mm)
b(mm)
JJ5004GS-01M
4.4
～
4.7
10.9
JJ5005GS-10M
4.4
～
4.7
10.9
JJ5004GE-01H
4.4
～
4.7
11.5
JJ5014GH-01M
5.4
～
5.7
10.6
JJ5014GE-01H
5.4
～
5.7
11.1
JJ5014GS-90M
4.9
～
5.2
10.7
Upper looper
Lower looper
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8
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FEED DOG & STITCH LENGTH ADJUSTMENT
8-1 Feed dog height adjustment
When the feed dogs are at the highest point of travel, 2 or 3 teeth from the back of the
main feed dog have to rise 0.8~1.0mm(a) above the top surface of the needle plate.
The height of the differential feed dog is as same as that of the main feed dog.
The support feed dog should be set to rise 0.5mm(b) lower than the main feed dog.
Adjustment is made by loosening clamp screw A,B,C.
8-2 Feed dog inclination adjustment
To make the feed dog tilt adjustment loosen screw A and turn collar B as required.
Turn to “a” : To tilt down the front side of the feed dog
Turn to “b” : To tilt up the front side of the feed dog
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