Service manual

0,5 mm
D - MACHINE ADJUSTMENT
Released: 10/2013
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10. UPPER THREAD TRIMMING
10.1 After attaching the holder with trimming knife
1
set
up the knife vertically to get a clearance of 0.1 – 0.15 mm
above the right spreader
4
and tighten the screw
3
. After
attaching the throat-plate there must be a clearance be-
tween the adjusted knife and throat-plate.
10.2 Adjust the basic angle setting of trimming knife
1
using the screw
2
in the way that left knife edge is away
from the area of throat-plate
8
. Adjust the knife so that its
blade is 2 mm from the edge of the throat plate.
10.3. The position of the knife
1
to catch the upper thread
loop can be changed by loosing the screw
5
so that the
knife edge is 0.9 mm from the needle
6
. If the position of
the knife changes, it is necessary to check the height – to
keep the play as in part 9.1.
10.4. Adjust the basic position of the actuator
9
with the
screw
11
after loosing the nut, so that the distance from
the arm
10
is 0.5 mm.
10.5. The trimming is adjusted by tilting the lever
13
. Loo-
sen the screw
12
. Tilting the lever
13
further into the direc-
tion of the roll
14
travel will make the trimming mechanism
action longer. If the lever
13
tilting into the direction of the
roll travel is smaller, the trimming mechanism action will
be shorter.
WARNING!
Maximal knife tilt
1
, is adjusted at the manufacturer. The
trimming knife
1
must not catch with its tip the bottom
thread
7
.
Position of looper during trimming
(sewing mechanism closed)
S-101.M
1-38