Synchro test program (using
SC-320
panel)
Whenthis function is used, the control box indicator section is used and indications are output from the
synchronizer. This test checks whether
the
upper/lower position detection signal and rotation detection
tachometer
signal
are beinginput correctly (duringtesting the
sewing
machinewillnot run; this is not a
malfunction).
n
u
n
u
771
u
In
u u
Upper
detection
Lower
detection
1 :
detected
0 :
not
detected
Tacho
generator
1 0
Test
program
indication
Fig.
4-10
Whenthe upper position is detected by turning the pulley by hand, the step A indicator switches from 0 to 1.
Whiledetection continues it keeps indicating 1. If the pulley is turned farther by hand and the position is no
longer detected, the indicator switches back from 1 to 0. The lower position detection can be checked in a
similar manner by using the step B indicator section.
If the pulleyturningis
speeded
up slightly and continued,the step D indicator
change
from0 to 1 and 1 to 0
in succession. This is because pulses are generated by the generator incorporated into the pulley. This
repeated changing
of
the indication confirms that the rotation detection signal is being
output
normally.
(9) Reversestitching solenoid timing correction
In automatic reversestitching, if the fon\'ard and reversestitches are not properly aligned this function will
correct for thisby changing the
reverse
feed solenoidON/OFF timing(this isonly effectivewhen there are
at least 3 stitches in each step).
When
the stitches are off due to such
causes
as
change
of automatic
reverse
stitchingspeedor
change
of head,
use this function to make the necessary adjustment.
* Automatic start reverse stitching solenoid ON timing correction
Make
the correction asin
Table
4-11
using
a combination of
SW6-5
(ACTA),
SW4-5
(HOSA
0) and
SW4-6
(HOSA 1).
Table
4-11
ACTA
HOSAO
HOSA
1
Correction
ON
OFF
OFF
- 1
ON ON
OFF
-0.5
OFF
ON
or
OFF
ON
or
OFF
0
ON
OFF
ON
0.5
ON
ON
ON
1
Fig. 4-11
* Assuming the point, which
is
one
stitch
before,
as
zero,
correction
can
be
made
one
stitch
before
or
after
that
zero.
Note)
The
solenoid
is
actuated
one
stitch
before
to
produce
a
time
delay
between
the
electrical
signal
and
the
mechanical
operation.
-
40
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