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(5) Installation of bobbin case
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❶
(6) Installing the knife
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❷
❶
Inch → mm CONVERSION TABLE
Knife size
1/4
3/8
7/16
1/2
9/16
5/8
11/16
3/4
13/16
7/8
1
1 1/8
1 1/4
1) Lift up and hold bobbin case latch lever between
2) Push the bobbin case into the hook so that it is
When replacing the knife with a new one, perform as
follows.
1) Knife ❶ can be easily removed together with the
2) Adjust so that the knife, when lowered the knife
1 to 2 mm
In case the cloth cutting knife on hand is indicated
Indication of mm
6.4
in inch, set the length of cloth cutting (knife size) in
9.5
mm using the inch → mm conversion table on the
11.1
left side.
12.7
Sewing data
14.3
Refer to
15.9
17.5
19.1
20.6
22.2
25.4
28.6
31.8
– 35 –
two fingers.
supported by the hook shaft ❶ and then snap in
the latch lever.
Press the bobbin case until the predetermined
position is reached, and it will click.
1. If the bobbin case is out of the pre-
determined position, it can jump out
from the hook to cause the needle
thread to tangle on the hook shaft.
Check to be sure that the bobbin case
is properly installed in the correct po-
sition.
2. There is a difference in the shape of
bobbin case between the standard
hook and the dry one. They have noth-
ing in common with each other.
washer when removing knife retaining screw ❷ .
bar by hand, is spaced 1 to 2 mm away from the
top surface of the throat plate as illustrated in the
sketch. Then, be sure to place the washer and
tighten the knife retaining screw.
is the length of cloth cutting.
"II-2-7. Changing sewing data"
p.81.
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