Orbital Timing Of Chain Looper - Eccentric - ELNA 745 Service Manual

CHAIN LOOPER : ANGULAR POSITION - CLEARANCE - ORBITAL
TIMING - CLEARANCE OF CHAIN NEEDLES GUARD

6. Orbital timing of Chain Looper - Eccentric:

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
in accordance with pages 11a and 11b.
Turn the handwheel towards you to bring the needle bar to the upper edge of "R1"
needle eye in its downward stroke flush with the needle plate. (Fig. 7)
Check if the orbital motion of chain looper from right to left is as per Fig. 3 in page 11a.
If not, loosen screws "b" of eccentric "6" (See page 3) and bring eccentric mark "c" close
to mark "d". The distance between marks "c" and "d" should be within -1.0 to 1.0 mm.
(Fig. 8).
Turn eccentric "6" forward (to the direction 1 ) and chain looper runs as per motion 1 .
(See Fig. 9).
Turn eccentric "6" backward (to the direction 2 ) and chain looper runs as per motion 2 .
(See Fig. 9).
Tighten screw "b".
11d