6. Chain looper: Eccentric - Orbital timing.
Make sure that there is no axial play on chain looper shaft.
If necessary, adjust with stop collar inside shaft "g". Check angular position of chain
looper and height and orientation of needle bar.
Turn the handwheel to bring the needle bar to the lower edge of "R1" needle eye in its
downward stroke flush with the needle plate.(Fig.6)
If necessary, loosen screws "b" of eccentric, align eccentric mark "c" with mark "d" and
tighten both screws "b". Recheck the adjustment.(Fig.7)
If formation of needle thread loop is incorrect, lower position of eccentric mark "c" by 0.5
to 1.0mm from mark "d".(Fig.8)
Check to make sure that the orbital motion of chain looper right to left is as per sketch
shown Fig.3 on page 12a.
12d
CHAIN LOOPER : ANGULAR POSITION - CLEARANCE - ORBITAL
TIMING - CLEARANCE OF CHAIN NEEDLES GUARD
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