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

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

Fig. 3

and

rests

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

and

Fig. 4

and slide the shaft forward to the position

shown in

Fig. 4.

Attach the knee lifter lever

Set the

stop screw

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

Set the rear stop dog

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,

accordance

with

the

instructions

page 6.

SPEED

The

maximum

speed

recommended

for

Machines

251-4

and

251-2

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.