43
Setting the balance between forward and reverse feeding.
The screws (11/19) at the guide shaft and (11/35) under the long
adjustment screw should be loose enough to permit
setting at the fastening plate of the guide motor.
Connect the machine and insert the service
cassette. Turn on the main switch and press the
button under 120, which gives 0.5 forward and
reverse feeding. Place a piece of fabric under the
presser foot and make a pencil mark at the needle
hole. Put the special key (411 6679-01) on the slots
of the bushing behind the guide. Run the
machine at top speed for at least 30
seconds. Find a position where the needle
pierces the same hole i.e. the pencil mark does
not move. If the machine feeds in reverse, the key
should be pressed downwards-if it feeds forwards,
press it upwards.
Thereafter, press the button under 130, which
gives 3.0 mm forward and reverse feeding
and repeat the test. Now return to the button
under 120 and readjust the bushing of the guide
shaft, if necessary, and then to the button
under 130 and the long adjustment screw.
Now test sew with cassette A4 (flatlock) and
buttonhole. Under certain conditions it may happen
that the buttonhole balance is not correct, in spite
of the fact that balance has been reached when forward and
reverse feeding with the service cassette. If this is the case
adjustment should not be carried out by means of the
potentiometers on the control panel but instead another
position. If the machine feeds forwards, turn
anti-clockwise; if it feeds in reverse
turn clockwise must be found with
the long adjustment screw where a
satisfactory buttonhole balance result can be
obtained. Then check the flatlock as well, i.e. A4.
Compare page 30.
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