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3.13 Sewing-foot stroke
Depending on the subclass, the 667 special sewing machine is equipped with
two adjusting knobs as standard for adjusting the sewing-foot stroke.
Use the left adjusting knob 2 to select the standard sewing-foot stroke
betw
een 1 and 9 mm.
Use the right adjusting knob 1 to set a higher sewing-foot stroke between 1
and 9 mm.
– T
urning adjusting knob 1 and 2 (1 to 9)
1
=minimum sewing-foot stroke
9 =maximum sewing-foot stroke
Automatic stitch rate limit
Machines without thread trimmer
The speed is not checked for these machines.
Please observe the information and table on the following page.
Machines with thread trimmer
The sewing-foot stroke and stitch count are interdependent. A potentiometer
is me
cha
nically connected to the adjusting knob. This potentiometer informs
the control unit what foot-stroke has been set and automatically limits the
sewing speed.
Machines with electropneumatic rapid stroke adjustment
When processing thick sections of material or when sewing over transversal
seams,
the higher sewing-foot stroke (adjusting knob 1) can be activated
while sewing by using knee switch 3 underneath the table.
As is the case for machines with thread trimmers, a potentiometer is also
used her
e.
Fig. 16 Fig. 17
CAUTION: Risk of breakage!
The standard sewing-foot stroke set with adjusting knob 2 should not be
greater than the stroke set with adjusting knob 1.
