UPPER LOOPER POSITION
When the upper looper (C) is at the leftmost position. The distance between the center of
needle on the right (F) and the center of looper eye (G) should be 4.8 to 5.2mm (3/16 to 3/
64”).
The space between the upper looper shaft guide (B) and the bottom of the upper looper
(C) should be 1.6-1.8mm (1/16 to 9/128”) when the upper looper is set at the lowest
position.
TO ADJUST
1.
Remove the machine base. (Refer to page 7.)
2.
Make sure that the marking-off line on the upper looper drive cam is in line with the
one on the main shaft. (Refer to page 17.)
3.
Remove the looper cover unit. (Refer to page 9.)
4.
Loosen the hexagon bolt (A), and adjust the distance between the upper looper shaft
guide (B) and bottom of upper looper (C) by using the part (I) of the Gauge 8289. The
distance should be 1.6 to 1.8 mm (1/16 to 9/128”) when the upper looper (C) is at the
lowest position.
5.
Tighten the hexagon bolt (A). Be careful not to tighten too much otherwise the upper
looper drive arm (D) will be cracked.
6.
Turn the hand wheel and bring the upper looper (C) to the leftmost position.
7.
Loosen the set screw (E), and adjust the distance between the center of needle and
center of upper looper eye (G) by using the part (H) of the Gauge 8289.
8.
Tighten the set screw (E).
9.
Check the upper and lower loopers timing (Refer to page 25), clearance between upper
and lower loopers (Refer to page 26) and clearance between the needle and upper
looper (Refer to page 26).
24
www.promelectroavtomat.ru
