– 29 –
1. Remove setscrews
and remove needle cooler unit
and cam
cover
.
2. Adjust the height of rear needle guard
with setscrew
and
adjust the longitudinal position with setscrew
.
(Caution) After the adjustment, check by manual turning whether
the top end of looper
does not come in contact with
the needle.
3. When turning the rear needle guard cam
in the direction of
rotation, the timing of rear needle guard
is advanced, and when
turning it in the reverse direction, the timing is retarded.
o When the clearance provided be-
tween rear needle guard
and
the needle is large, stitch skip-
ping, blunt blade point of the
looper, or needle breakage will be
caused.
o When the contact of rear needle
guard
with the needle is
strong, blunt needle tip 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...
