Speed – SINGER 251 User Manual
Page 5
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SETTING UP
TABLE
CUT-OUT
Fig. 3. Installation of Machine
on Base
Fig. 4. Installation of Knee
Lifter on Machine Base
When shipped, the base is held to the machine by
a
single bolt
through the bottom of the base.
Discard
this bolt
and plug the hole by inserting from inside
the base, the special cap screw
K, Fig. 3,
furnished
with the machine.
The base fits into a standard table cut-out, as shown
in
Fig. 3
and
rests
on
the
four
corners
without
fastening.
Rasp the edges of the cutout, if necessary,
as the
base must slide in without driving
and must be located
so that the
machine head does not touch the table
when it is placed on the base.
Use shims on the corners, if necessary, to prevent
the base from rocking. The base should also be
level
in both directions
so that the oil level will be accurately
indicated by the marks in the base.
See that the plunger
L, Fig. 3
is in place inside the
base, before putting the machine on the base.
The machine head rests on the cork gasket in the
base and is not fastened.
The machine hinges must
not support the head
except when it is tilted back.
The knee lifter is shipped assembled to the base,
except for the knee plate and lever
J, Fig. 4.
After
the base is in position, loosen the set screws
D
and
E,
Fig. 4
and slide the shaft forward to the position
shown in
Fig. 4.
Attach the knee lifter lever
J.
Set the
stop screw
F
so that there is
only a little play of the
lifter before it starts to lift the presser bar,
then hold
the screw and tighten lock nut
G.
Set the rear stop dog
H
to allow the presser bar to be just raised to its limit
but not enough to permit further strain on the knee
lifter parts or to permit the action of the knee lifter
to lift the machine from its base.
CAUTION:—
Before starting the machine, it must be
thoroughly
oiled,
in
accordance
with
the
instructions
on
page 6.
SPEED
The
maximum
speed
recommended
for
Machines
251-4
and
251-2
is
5000
revol utions per minute and
for Machine
251-3, 4300
revolutions per minute ac
cording to the material being sewn and the type of
work being done. (See chart on opposite page.)
It is advisable to operate these machines at a more
moderate speed the first few days,
after which they
can be operated at maximum speed.