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5
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 mecha-
nically 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).
6.7 Adjustment of the zigzag stitch width(Fig. 8)
Before any changing of the zig-zag stitch width, it is necessary to
stop the machine in such a way, so that the needle is in its top
position. Further it is necessary to turn a bit the arresting lever (D)
to the left (in counterclockwise direction) and to have it loosened
until having proceeded the required change of adjustment. In
turning a little the lever in the opposite sense (to the right), there
occurs blocking of the set up width of the zig-zag stitch.
The width of the zigzag stitch is continuously adjustable acording
to the machine types from 0 up to 10 mm. It is adjusted by the lever
(E) projecting above the cover (F) of the zigzag stitch mechanism.
In moving the lever to the right (towards the hand wheel) we increase
the width of the zigzag stitch up to the maximum, in moving the
lever to the left, we reduce the width of the zigzag stitch up to zero.
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.
E
D
A
C
S
F
B
Fig. 8
Fig. 9
P
Fig. 10
+-
B
A
9


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