– 13 –
– 13 –
‒ 13 ‒
4. Adjusting the stitch length
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.
The stitch length can be infinitely adjusted from 1.2 mm to
3.6 mm.
* The actually sewn stitch length varies in accordance
with kind and thickness of the materials.
[How to change the stitch length]
Turn clockwise feed regulating knob
❶
to increase the
stitch length.
Turn it counterclockwise to decrease the stitch length.
•
When making the stitch length 3.6 mm or more
Loosen screw
❷
and turn clockwise feed regulating knob
❶
to regulate the stitch length.
Push pin
❸
until it goes to the end, and fix it with screw
❷
.
Use the machine within the range where feed dogs or feed
dog and throat plate do not come in contact with each oth
-
er.
Loosen differential lock nut
❶
and move lever
❷
up to
increase the differential feed ratio. Then the sewn material
is gathered.
Move lever
❷
down to decrease the differential feed ratio.
The differential feed ratio becomes 1 : 1 at the position
where the pointer of lever
❷
is on the long scale. Note
that two scales on the upper side show 1 : 1.4 and 1 : 2
respectively, and one on the lower side 1 : 0.7.
Fine adjustment of the differential feed ratio can be per
-
formed with micro-adjustment knob
❸
.
There is a case where feed dogs or feed
dog and throat plate come in contact with
each other by the aforementioned adjust-
ment according to the relation between the
stitch length and the differential feed ratio.
So, be very careful.
5. Adjusting the differential feed ratio
Gathering
Stretching
❶
❷
❷
❸
❸
❶
❸
❷
❶
