Operation Manual

6.2.2 Function of supplementary thread tension in relation to the sewing foot lifting and the Speedomat
for subclass 869- ...
The thread supplementary tension can, at any time, be switched on or
off by actuating key 1 (see chapter 6.14) of the key pad. The parameter
F-255 must be set on “7" for this to w ork.
Parameter Stroke adjustment max. Stroke adjustments
Setting via knee switch setting wheel
Reaching of the HP-speed
of parameter F-117
(Speedomat)
F-197 = 0 1 1
F-197 = 1 0 1
F-197 = 2 1 (*) 0
F-197 = 3 0 0
(*) If the stroke adjustment (max.) is switched on via the knee switch
and the HP-speed (from parameter F-117) is reached through the
“Speedomat”, then the s upplementary thread tensioner will be switched
on automatically.
0 = Supplementary thread tension closed mechanically
1 = Supplementary thread tension opened mechanically
·
If the supplementary thread tensioner is closed, this condition will
be maintained when adjusting the stroke.
·
When switching the machine off, the last setting of the
supplementary thread tensioner will be maintained through the
mains connection.
Basic setting of the control unit for the automatic stepped reduction of
the speed (Speedomat) through the setting wheel for the height of the
alternating feed stroke
Parameter 188
Step 01-21 Entire Speedomat range
Step 01-10 max. allowed speed, Parameter
F-111 = 3000 min
-1
Step 11-18 Linear stepwise reduction of the max. s peed
(Speedomat)
Step 19-21 max. allowed speed, Parameter
F-117 = 1.800 min
-1
6.3 Opening the thread tension
Subclasses
869-180020, 869-280020
When lifting the sewing feet with the knee lever, the main and
supplementary tensioners are automatically opened.
Subclasses
869-180122, 869-180322, 869-280122, 869-280322
The needle thread tension is automatically opened when trimming the
thread.
14