-14-
2 7 . A d j u s t i n g t h e t e n s i o n r e l e a s i n g m e c h a n i s m
( F i g . 3 5 )
The tension discs should be pushed apart to open
when the presser foot is lifted. But the open timing
of the tension discs can be adjusted as follows:
Romove face plate and the rubber plug at rear side
of arm and loosen screw (A) of the knee lifting lever
(left), then the tension releasing cam can be moved
leftward or rightward when the cam is moved right-
ward, it is later to open, otherwise it is earlier to
open.
28.Adjusting feed timing of needle bar, Presser foot and feed dog (Fig.36、37)
(A) Lift presser foot, make the stitch length to
the maximum, turn balance wheel slowly to lower
needle down into hole of feed dog, observe whether
needle is at the center of feed dog hole or not.
(B) Keep on turning balance wheel, move the
needle forward a stitch lengty. If the needle is at
position B, shows timing feed of the three; if at A,
indicates the feed amount of needldbar and presser
foot is larger than that of feed dog, then reduce L;
if at C, indicates the feed amount of needle bar and
presser foot is smaller than that of feed dog, ten
enlarge L till the needle arrives at B.
35
Right
D
Left
37
L
A
B
C
B
Forward
Needle
Stitch
length
36
