Brother International MD-817 Service Manual - Page 5

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C DESCRIPTION OF THE MOTOR * The Brother DC servomotor is best suited to reducing sewing labor requirements and enhancing automation; the advanced functions being provided with a total system design. FEATURES 1. Energy Savings Power consumption is reduced about 50% with the DC servomotor when compared with coventional Brother clutch motors; when the sewing machine is stopped, the DC servomotor is also stopped, resulting in high energy savings. 2. Quiet Operation While the clutch motor produces a whirring sound and vibrations while idling, the DC servomotor is free of these because it does not run when the sewing machine is stopped. 3. Easy maintenance Maintenance is as easy as adjusting the solenoid brake spacing. There is no need to ever replace the moving brake plate. 4. Reliability High integration microcomputers and hybrid Cs are used to achieve higher reliability. 5. Smart stop The needle movement due to inertia upon finishing sewing has been greatly reduced to make sewing more controlled. 6. Flexible function Each respective time or parameter setting, which were previously fixed, can be changed on the operation panel to flexibly accomodate various sewing mahcine requirements. 7. Internal terminal cord fuse The fuse for the lamp terminal cord can be attached to the rear of the control box. 8. Standard dimension The dimension required to attach the motor fixing bracket has been changed to a standard dimension to accomodate commercially available clutch motors. 9. Standing operation and automatic sewing Standing operation and automatic sewing can be used with the external signals (options) on the control printed circuit board. * Use the DC servomotor for the following sewing machines. [D82-8737] Mark II [DB2-B7721 *The DC servomotor is also used with automatic thread trimming machines, models DB2-6748, 8795, and 8798.

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C
DESCRIPTION
OF
THE
MOTOR
*
The
Brother
DC
servomotor
is
best
suited
to
reducing
sewing
labor
requirements
and
enhancing
automation;
the
advanced
functions
being provided
with
a
total
system
design.
FEATURES
1.
Energy
Savings
Power
consumption
is
reduced
about
50%
with
the
DC
servomotor
when
compared
with
coventional
Brother
clutch
motors;
when
the
sewing
machine
is
stopped,
the
DC
servomotor
is
also
stopped,
resulting
in
high
energy
savings.
2.
Quiet
Operation
While
the
clutch
motor
produces
a
whirring
sound
and
vibrations
while
idling,
the
DC
servomotor
is
free
of
these
because
it
does
not
run
when
the
sewing
machine
is
stopped.
3.
Easy
maintenance
Maintenance
is
as
easy
as
adjusting
the
solenoid
brake
spacing.
There
is
no
need
to
ever
replace
the
moving
brake
plate.
4.
Reliability
High
integration
microcomputers
and
hybrid
Cs
are
used
to
achieve
higher
reliability.
5.
Smart
stop
The
needle
movement
due
to
inertia
upon
finishing
sewing
has
been
greatly
reduced to
make
sewing
more
controlled.
6.
Flexible
function
Each
respective
time
or
parameter
setting,
which
were
previously
fixed,
can
be
changed
on
the
operation
panel
to
flexibly
ac-
comodate
various
sewing
mahcine
requirements.
7.
Internal
terminal
cord
fuse
The
fuse
for the
lamp
terminal
cord
can
be
attached
to
the
rear
of
the
control
box.
8.
Standard
dimension
The
dimension
required
to
attach
the
motor
fixing
bracket
has
been
changed
to
a
standard
dimension
to
accomodate
commer-
cially
available
clutch
motors.
9.
Standing
operation
and
automatic
sewing
Standing
operation
and
automatic
sewing
can
be
used
with
the
external
signals
(options)
on
the
control
printed
circuit
board.
*
Use
the
DC
servomotor
for
the
following
sewing
machines.
[D82-8737]
Mark
II
[DB2-B7721
*The
DC
servomotor
is
also
used
with
automatic
thread
trimming
machines,
models
DB2-6748,
8795,
and
8798.