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27. Setting of the stop in the top position of the needle
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
The proper principle of the top position setting is described in detail in the instructions for setting the driving unit. The machine
is being delivered from the manufacturing factory after having been tested and after having proceeded to a running-in sewing
with the adjusted values, i.e. the machine stops in the top position which varies between 5
thread lever.
28. Making an upper thread reserve
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
The reserve of the upper thread may be influenced by several methods:
a) Correct tension of the ausiliary tensioner - the greater is the tension of the auxiliary tensioner, the lesser is the reserve of the
upper thread and inversely.
b) Correctly set the top position of the thread lever - in stopping before the top dead centre of the thread lever the reserve of the
upper thread is reduced, behind the top dead centre it is increased.
29. Dismounting and mounting of the plate (Fig. 25)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
When it is necessary to dismount the plate (2), loosen two screws (3) which secure the firm connection of the plate with the
bedplate of the machine, and take out the plate. When remounting it, proced in the inverse way.
30. Dismounting and mounting of the movable cutting knife (Fig. 24)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
Proceed to the dismounting of the plate (2) according to the point 29 and then take out the knife (1) from the guide in the
direction of the arrow "S". When remounting it, proced in the inverse way.
10
o
o
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behind the top position of the
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