KANSAI SPECIAL NC Series, Parts List, Instructions

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15
NC/J
series
【 9 】 TENTION ADJUSTMENT OF ROLLER BELT （ NC/J series ）
9-1 Tension adjustment
1. To adjust strength of spring F by loosen screw D and turn the collar E.
2. To adjust the presser of roller C with screw G after loosen nut H. （ see 7-1 ）
3. Move puller base bracket A front or back. When the bracket moves to back, tension of
timing belt should be strong. When the bracket moves to front, tension of timing belt
should be loose.
<Note >
Carefully the tension of timing belt because of roller C will not move up and down
smoothly, otherwise it will be some trouble occurred with this operation so that
make tension balance with adjusting 7-1 of the above.
16
NC/J
series
【 10 】 STITCH FORMATION
10-1 Position of the needle thread guides
The distance from the center of the eyelet of the
needle thread guide to that of the set screw should be
approximately 17.5mm (see the illustration).
Adjust the height of the thread guide by loosening
screws A and moving thread guide up or down (refer
to the distances shown in the illustration).
If the stitch formation cannot be changed extremely
by adjusting the height of the thread guides because
of the thread to be used, unravel the thread after test
sewing and adjust the height of the thread guides
while checking the tension of the needle thread.
10-2 Position of the thread guide on the needle thread take-up
When the needle bar is at the bottom of its stroke,
needle thread take-up bracket A should be level and
the distance from the center of the shaft to the thread
guide of needle thread take-up B should be 75mm.
To make this adjustment, loosen screws C and D.
To tighten the needle thread, move needle thread
take-up to Y. To loosen the needle thread, move
needle thread take-up to X.
10-3 Position of the needle thread guard
When the needle bar is at the bottom of its stroke, the center of the eyelet of thread guide
A should be level with the top surface of needle thread guard B. In addition, A should be
parallel with B. To adjust the height of needle thread guard B, loosen screw C and move
needle thread guard B up or down. To tighten the needle thread, move up B. To loosen the
needle thread, move down B.
■ For cotton threads (non-stretchable threads)
Bring the needle thread guard 2.0mm below the standard, or do not use the needle thread
guard. Loosen screw C and move down the needle thread guard.