Brother International MD-817 Service Manual - Page 34

timing, chart

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NBN timing chart A. Thread trimming timing when SW 3 is set to ON ( when thread nipper function is activated ) Depressing treadle backward Needle down position signal Needle up position signal Pitch condense solenoid Thread trimming solenoid Tension release solenoid Brake solenoid Thread release solenoid Thread nipper solenoid Presser foot l ifter solenoid T24 1 40msec. T20 T21 T22 T11 : 113 : 2O0Hz T14 1-. B . Tread trimming timing when SW 3 is set to OFF ( when thread nipper function is deactivated ) Presser foot l itter solenoid Thread release solenoid OFF Thread nipper solenoid OFF 112 T13 : 2O0Hz T14 C. Sewing start timing after thread trimming Depressing treadle forward Needle down position signal Needle up posit ion signal Tension release solenoid n pulse Thread release solenoid m pulse >K. Inching speed area 123 , Slow speed area ( 2 stitches ) n pulse : This is set by DIPC1 and 2. There are 4 kinds of numbers. ( 0, 10, 20. 30 ) m pulse : This is set on the operation panel. Zero to nine pulses can be set; the default is 2. Slow speed aera : This is set to on the operation panel. Zero to nine stitches can be set; the default is 3. ( Al l signals are activated when they are in the low position. )) -30-

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NBN
timing
chart
A.
Thread
trimming
timing
when
SW
3
is
set
to
ON
(
when
thread
nipper
function
is
activated
)
Depressing
treadle
backward
Needle
down
position
signal
Needle
up
position
signal
Pitch
condense
solenoid
Thread
trimming
solenoid
Tension
release
solenoid
T24
Brake
solenoid
Thread
release
solenoid
Thread
nipper
solenoid
Presser
foot
l
ifter
solenoid
1
40msec.
T20
T21
T22
T11
:
113
:
2O0Hz
1.
-
T14
B
.
Tread
trimming
timing
when
SW
3
is
set
to
OFF
(
when
thread
nipper
function
is
deactivated
)
Presser
foot
l
itter
solenoid
Thread
release
solenoid
OFF
Thread
nipper
solenoid
OFF
112
T13
:
2O0Hz
C.
Sewing
start
timing
after
thread
trimming
Depressing
treadle
forward
Needle
down
position
signal
Needle
up
posit
ion
signal
Tension
release
solenoid
Thread
release
solenoid
T14
n
pulse
m
pulse
>K.
Inching
speed
area
123
,
Slow
speed
area
(
2
stitches
)
n
pulse
:
This
is
set
by
DIPC1
and
2.
There
are
4
kinds
of
numbers.
(
0,
10,
20.
30
)
m
pulse
:
This
is
set
on
the
operation
panel
.
Zero
to
nine
pulses
can
be
set;
the
default
is
2.
Slow
speed
aera
:
This
is
set
to
on
the
operation
panel.
Zero
to
nine
stitches
can
be
set;
the
default
is
3.
(
Al
l
signals
are
activated
when they
are
in
the
low
position.
))
—30—