Instruction manual

8
6.6 Adjustment of the stitch length, reverse stitching (Fig. 8, 9)
The stitch length is changed in turning the knob (A), which is placed on the arm web, according to the numbers indicating the
stitch length against the symbol (B) on the machine arm. In turning the knob in the direction of the arrows, the stitch length is
increased (+) or reduced (-).
The direction change of feeding the stitched material is mechanically controlled by the reversible stitch lever (C) in pushing it in
the direction of the arrow (S).
According to the chosen accessory, the machine can be provided with an electromagnetic backtacking control (see Part B, par.
8) or with a control by a backward stitch pedal (P).
Fig. 8b
P
Fig.9
H
G
Fig. 10
+-
E
B
A
-
S
A
C
B
Fig. 8a
+
6.7 Adjustment of the pattern width (Fig. 9)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation,
wait until the motor stops!
Before any pattern width change. it is necessary to stop the machine with
the needle in its top position. According to the table 2, mount the cam for
the desired pattern and the pattern width is to be set in such a way, so that
it suits the interval of the respective cam indicated in the table 2. The
pattern width is continuously adjustable. Setting is to be done after having
removed the guard on the machine arm on the lever (E) which controls the
movement of the needlebar holder. Using a key, loosen the nut (G) on the
screw (H), on which the draw bar from the needlebar holder is mounted.
When shifting the screw in the slot of the lever (E) downwards, the pattern
is being narrowed, in shifting it upwards, the stitched pattern is widened.
When setting the maximum width of the patern, check the needle to avoid
its striking into the throat plate. Lock the set up position with the nut (G).
When using the accessory for sewing with two needles, the pattern width
is to be set in such a way, so that the needles pass with sufficient clearance
within the needle groove of the throat plate.
6.8 Regulation of the presser foot pressure,
presser foot lifting (Fig. 10)
The pressure of the presser foot is regulated using an adjusting screw in the
hole (A) which is placed below the top cover of the machine arm and is accessible
from above through the hole in this cover. In turning the adjusting screw in
the direction of the arrows we increase (+) or reduce (-) the pressure of the
presser foot. The pressure of the presser foot must be sufficient for ensuring
a reliable and continuous feeding of the sewn materila with the maximum
sewing speed. A correct adjustment of the pressure of the pressure bar
influences, whether the sewn material is being continuously fed without any
damage and whether the stitch length is uniform.
The mechanical lifting of the presser foot is enabled by means of the hand
lever (B) which when lifted arrests the presser foot in its top position. The
presser foot can be lifted with the knee lever or with the left pedal too -
according to the machine subclass.
The assembling procedure of the automatic presser foot lifting using
electromagnet is described in the part B, par. 7.