KANSAI SPECIAL NC Series, Parts List, Instructions

Page: 57 / 83

9
NC
series
5-2 Adjusting the needle height
When the needle bar is at the bottom of its stroke, remove the plug on the head cover,
loosen screw A, and move the needle bar up or down. Setting distance B varies according to
the needle stroke or gauge size for further adjustment. (See chapter 5-4)
5-3 Angle and height for installing the looper
To obtain the proper angle and height, insert the looper fully into looper holder A and then
tighten screw B. The proper angle for the looper is 2º 30’. Distance at 25mm from the point
of the looper between the bottom of the looper blade and the extension line from the point
of the looper : Approximately 1.1mm.
< Note >
After the above adjustment, check to make sure each needle drops into the center of
each needle hole.
10
NC
series
5-4 Looper setting distance
When the looper is at its farthest position to the right, looper setting distance is the
fundamental distance from the point of the looper to the center of the needle should be 6mm.
Also, setting distance X varies according to the needle stroke or gauge size for further
adjustment. (See the table below)
The point of the looper should pass the center of the left needle and 1.3~1.6mm above the
top of its needle’s eye when the looper moves to left on the back side of the left needle .
5-5 Needle/looper front-to-back relationship
When the point of the looper moves to the left needle should be same distance Y from the
top of its needle’s eye to the point of the looper by referring to the illustration below. To
adjust the timing of the looper to the needles, remove the machine cover, loosen screws A
on the timing pulley (upper), and shift the timing pulley (upper) by turning the handwheel
while holding the timing pulley by hand.
Needle height
(Bmm)
Looper setting
distance
（ Xmm ）
31
33 （ STANDARD ）
31/33
3.2 (1/8)
8.2 ± 0.2 9.7 ± 0.2 4.4
4.0 (5/32)
7.8 ± 0.2 9.3 ± 0.2 4.0
4.8 (3/16) 7.4 ± 0.2 8.9 ± 0.2 3.6
5.6 (7/32) 7.0 ± 0.2 8.5 ± 0.2 3.2
6.4 (1/4)
6.6 ± 0.2 8.1 ± 0.2 2.8
gauge
(inch)