Bernina 125 Manual - Page 28

Change

of

driving

belts

It

may

be

that

after

long

use

of

the

driving

belts,

it

will

be

necessary

to

change

them.

The

need

of

change

will

be

noticed

if,

for

instance,

by

pressure

on

the

kneelever

the

motor

is

set

in

motion,

but

not

the

machine.

For

changing

the

belts,

remove

the

cover

plate

of

the

machine

be

low

the

hand

wheel,

taking

out

the

3

nickel

-

plated

screws.

Remove

also

the

regulating

screw

with

the

brown

knob

No.

30,

fig.

22,

by

turning

it

anti-

clockwise.

Then,

taking

off

the

cover

plate,

the

driving

belts

are

visible.

The

lower

short

belt

can

be

exchanged

without

any

difficulty.

If

it

is

necessary

to

take

off

the

vertical

longer

belt,

remove

at

first

the

brown

bakelite

hand

wheel

cover,

loosening

the

2

screws.

Then,

loose

the

screws

on

the

hand

wheel

hub

and

take

the

latter

off the

main

shaft.

The

long

belt

can

now

be

exchanged.

When

replacing

the

hand

wheel,

be

sure

that

the

hub

screw

comes

to

lie

on

the

milled

part

of

the

main

shaft

and

the

end

of

this

forms

one

line

with

the

end

of

the

hand

wheel

hub.

Then

tighten

the

hub

screw

very

well.

52

Top

Thread

breaks

Needle

of

inferior

quality,

roughly

polished.

Needle

is

not

inserted

correctly.

Long

groove

in

needle

-

must

face

the

operator.

Needle

is

blunt

or

bent.

Needle

size

is

not

suitable

for

material

to

be

sewn

and

thread

used.

Top

thread

tension

is

too

tight.

Thread

passages

are

not

smooth

and

need

repolishing.

Thread

control

spring

No.

22,

Fig.

11

is

broken.

Needle

hole

in

throat

plate

is

damaged

by

the

needle

And

needs

repolishing.

Shuttle

point

is

too

sharp.

Call

mechanician!

Shuttle

race

is

not

oiled.

Poor

quality

thread

with

knots.

Bobbin

Thread

breaks

Bottom

thread

tension

is

too

tight.

Bottom

thread

not

properly

wound

on

bobbin.

Bobbin

crushed

and

jamming.

Needle

hole

in

throat

plate

is

damaged

by

the

needle

and

needs

repolishing.

Faulty

Stitches

Wrong

needle.

Use

system

705

only.

Needle

is

blunt

or

bent.

Needle

is

not

inserted

correctly.

Long

groove

in

needle

must

face

the

operator.

Needle

is

not

pushed

right

up

in

the

needle

bar.

Low

grade

needle,

roughly

polished.

Needle

size

is

not

suitable

for

the

thread

used.

53

Bernina 125 Manual - Page 28

Change, driving, belts

Page 28 highlights