– 21 –
1. To adjust the timing relation between the needle and the looper,
remove the top cover, loosen four setscrews
in the sprocket and
turn upper pulley
in the state that the sprocket is held.
2. Adjusting procedure
(1) In case dimension
A
when the looper advances (going) is smaller
than dimension
B
when the looper retreats (returning), the looper
timing is retarded (needle timing is advanced). In this case, loosen
setscrews
in the sprocket and finely turn upper pulley
in the
reverse direction.
(2) In case dimension
A
when the looper advances (going) is larger
than dimension
B
when the looper retreats (returning), the looper
timing is advanced (needle timing is retarded). In this case, loosen
setscrews
in the sprocket and finely turn upper pulley
in the
normal direction.
(Caution) Be careful not to excessively turn upper pulley
.
3. After the adjustment, fix four setscrews
in the sprocket.
o When the difference in timing
(going and returning) of looper is
excessively large, stitch skipping
or entangling of needle thread
will be caused.
Adjustment Procedure
Results of Improper Adjustment
Summary of Contents for MF-7800D Series
Page 64: ...60 5 Adjusting the upper knife stroke A B Standard Adjustment H21...
Page 66: ...62 MEMO...
Page 80: ...76 3 Adjusting the elastic band presser plate 0 5mm Standard Adjustment E10 A A Approx 7 5 mm...
Page 84: ...80 MEMO...
Page 94: ...90 3 Setting of SC 510 2 Change of the setting Type B Type A Standard Adjustment UT25...
Page 114: ...110 MEMO...
Page 118: ...114 2 Installing SC 510 1 Wiring SC 510 Standard Adjustment UT22...
Page 124: ...120 MEMO...
Page 134: ...130 MEMO...
Page 142: ...138 7 Feed timing of the roller A Standard Adjustment PL11 C D B...
